Most organs have almost the same relative permeability value as that of the free space (Ping-Ping Ding et al, IEEE Transactions on Magnetics, 2014; J. Malmivuo and R. Plonsey, Bioelectromagnetism, 1995). One factor influence the magnetic filed is the magnetic volume susceptibility of the tissue, but it is often very small although non-zero (Schenck JF, Progress in biophysics and molecular biology, 2005). Some non-zero susceptibility tissues have the thermal effect in alternative field. It also depends on the frequency of the field.

Low-frequency magnetic fields induce circulating currents within the human body. The strength of these currents depends on the intensity of the outside magnetic field. If sufficiently large, these currents could cause stimulation of nerves and muscles or affect other biological processes.

Both electric and magnetic fields induce voltages and currents in the body but even directly beneath a high voltage transmission line, the induced currents are very small compared to thresholds for producing shock and other electrical effects.

Electric and magnetic close related. A current creates a magnetic field around it, and a conductor in a varying magnetic flux produces an electromotive force.

About the health effects of non-ionizing radiation, they can be 3 types as follows:

(1) Heat effect

(2) Non-heat effect

(3) Cumulative effect

There is not only the heat effect to human body.

Dear Roland,

You are right that magnetic heating in human body is mainly done in magnetic particles, where the hysteresis loop is got. But we have magnetic substances as the iron Fe in our body, notice that the 7% of our body is blood which contains hemogoblin in red blood cells. And although the blood is a fluid non magnetic because the magnetic moments are not aligned, this could depend of the strenght of the applied magnetic field. On the other hand if the frequency is high enough then by Faraday law there are also electric currents induced which could produce even heat too.

Bellow two articles have good explanation:

https://www.technologyreview.com/s/412954/how-magnetic-fields-may-affect-biological-tissue/

https://www.ncbi.nlm.nih.gov/books/NBK208983/

The magnetic field can heat the human body, it it varies in time. It's the induction law. Fields originated by electrical energy lines or telecommunications always vary in time. If these fields are below the threshold maxima referred by the International Agencies no harm is noticed. To be sure, just measure the field. Like in many other situations accurate measurements are the answer.

Most organs have almost the same relative permeability value as that of the free space (Ping-Ping Ding et al, IEEE Transactions on Magnetics, 2014; J. Malmivuo and R. Plonsey, Bioelectromagnetism, 1995). One factor influence the magnetic filed is the magnetic volume susceptibility of the tissue, but it is often very small although non-zero (Schenck JF, Progress in biophysics and molecular biology, 2005). Some non-zero susceptibility tissues have the thermal effect in alternative field. It also depends on the frequency of the field.

Magnetic field is the source of many other reactions, those are able to harm the human body. So, indirectly Yes. But itself, upper a certain limit, can also be harmful. I'm, however tempted to do the experience.

Dear Roland,

yes the electromagnetic field can heat the human body, but the heating levels related to some parameters like frequency, amplitude and distance.

Of course that it can heat the body especially the low frequency EMF.

Yes, magnetic field in our body very harmful

If it is exceeded threshold value.In our body static charges interact with magnetic field create EM waves , which are mainly responsible for heat generation.

Impacts of magnetic/electromagnetic fields on human body

An entire field of science called bioelectromagnetics has grown up to study this problem.

Electromagnetic pollution (or EMF pollution) is a term given to all the man-made electromagnetic fields (EMFs) of various frequencies. Studies indicate that the electromagnetic fields have adverse effects on human body depending upon the intensity and frequency of electromagnetic fields. Unnecessary exposure to electromagnetic fields should be avoided.

Read the the article:

Dear Roland,

Thanks for the question. I agree with Daniel Baldomir,

With my best regards!

Adel OUESLATI

As it has already been said, magnetic field, if not static, can heat human body. We could even levitate in a magnetic field since of our body is mainly diamagnetic. See for instance this levitating frogs in a strong (e.g. 16 T) magnetic field (https://www.youtube.com/watch?v=A1vyB-O5i6E ).

But there are not only heat effects that would be of importance. Magnetic fields, even when their intensities are much below the threshold of heating our tissues, can have more subtle influence on our organisms. If the fields are chaotic and on higher frequencies, there is a probability that the influence will be harmful to some degree. If the fields are ordered (rhythmic) and at certain frequencies (like 256 Hz), then the influence can be beneficent. Even the relatively weak and subtle geomagnetic field can have significant effects on organisms (see https://www.researchgate.net/publication/272843719_Geomagnetic_and_strong_static_magnetic_field_effects_on_growth_and_chlorophyll_a_fluorescence_in_Lemna_minor?_iepl%5BviewId%5D=hT0iArIxOecfaNsecDwtEEKy&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A272843719&_iepl%5BinteractionType%5D=publicationTitle ). It may have effects on germination of seeds (see https://www.researchgate.net/publication/237870722_Effects_of_weak_low-frequency_magnetic_fields_on_spruce_seed_germination_under_acid_conditions?_iepl%5BviewId%5D=zbcJ4Ds0l90pUeD05ImpVJnQ&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A237870722&_iepl%5BinteractionType%5D=publicationTitle or https://www.researchgate.net/publication/232074025_Water_Stress_Reveals_Effects_of_Elf_Magnetic_Fields_on_the_Growth_of_Seedlings .

External magnetic field can work on ions (e.g. cyclotron theory) or on the endogenous oscillating EM fields (see also https://www.researchgate.net/publication/309207200_Bio-Soliton_Model_that_predicts_Non-Thermal_Electromagnetic_Radiation_Frequency_Bands_that_either_Stabilize_or_Destabilize_Life_Conditions ). There is still a lot of research needed to disentangle the interaction between organisms in their molecular aspects and the magnetic field.

One simple approximation that you could make is to assume that the human body is made of water. Then you can reduce your question to: what happens to water molecules in a magnetic field. Consequently, you would have to ask how you can break the Van der Waals Bond in water with a magnetic field.

I think here you would have to differentiate between a static or dynamic magnetic field. For instance, a 10 T static magnetic field can levitate water molecules, but is it enough to rip them apart?

Dr. Igor Jerman,

Your remarks "......a lot of research needed to disentangle the interaction between organisms in their molecular aspects and the magnetic field"

I agree with this view - we know very little about this subject.

"Magnetotherapy" is also considered as an alternative treatment for curing of some health problems like body pain. http://www.itechmedicaldivision.com/en/magnetotherapy_frequently_asked_questions-t-54.html

Regards

The magnetic field affects the body. The static magnetic field can deflect the ions flowing in blood increasing their path to their target. This is according to the Lorenz force FL= Q vxB, where B is the magnetic flux density, v is the velocity of the ion and Q is its charge.

If the magnetic field is time varying it will induce an electromotive force which drive electric current in the body causing heating of the body. As the frequency increases the induced current increases and so the heating effect. Also as the the frequency increases the magnetic field will be confined in regions nearer to the skin. The conductivity of the human body stems from its water electrolyte content.

Best wishes

The static magnetic field may produce heating also due to the effect of motional EMFs. It will take significant effect at a fast moving person in the area of strong magnetic field.

see this article:

http://www.sciencefocus.com/qa/how-strong-does-magnetic-field-have-be-affect-human-body

Dear Roland, In MRI, a strong magnetic field is utilized for internal organ imaging noninvasively and it deviates the natural spin of H+ (Hydrogen atom) which is present in water. Spinning H+ act like a tiny magnet, so it can be influenced by external magnetic field. Interestingly, our body is made up of by 70% of water molecules and usually, patients experience some amount of heat during scanning. I think you got your answer.

Dear all

as already said in several comments..the magnetic field itself virtually does not do anything to the human body in terms of heating since the magnetic loss tangent also at higher frequencies of all body constituents is very close to zero (including blood which contains iron but as a compound).Of course via Faradays law the induced electric field can do heating via electric losses which are rather large.About any possible nonthermal effects..thats a huge debate and controversial...in any case..if you have to saty in the Strong field of an NMR magnet (not as patient but as worker) do move very slowly in particular with your head otherwise you may see phosphenes

Dear Roland

You are quite right. It is primarily the electric field that causes heating, heating due to the magnetic component of low frequency magnetic fields is minimal.

But, as soon as the magnetic field is time varying, the changing magnetic field will induce an electric field (movement in a strong static field will do the same) and that is what causes the heating.

ICNIRP publications explain this.

Quoting from ICNIRP guidelines at https://www.icnirp.org/cms/upload/publications/ICNIRPLFgdl.pdf :

"For magnetic fields, the permeability of tissue is the same as that of air, so the field in tissue is the same as the external field. Human and animal bodies do not significantly perturb the field. The main interaction of magnetic fields is the Faraday induction of electric fields and associated currents in the tissues. Electric fields may also be induced by movement in a static magnetic field. Key features of dosimetry for exposure of humans to low frequency magnetic fields include: ● for a given magnetic field strength and orientation, higher electric fields are induced in the bodies of larger people because the possible conduction loops are larger; ● the induced electric field and current depend on the orientation of the external magnetic field to the body. Generally induced fields in the body are greatest when the field is aligned from the front to the back of the body, but for some organs the highest values are for different field alignments; ● the weakest electric fields are induced by a magnetic field oriented along the principal body axis; and ● the distribution of the induced electric field is affected by the conductivity of the various organs and tissues. "

I'd say that the heating efect is the least dangerous phenomenon for a living mamal's body wile charge carrier movement in magnetic fiels and the efects of the variable field's intensity (temporal-spatial) would have realy damaged such a body, long before the heating efect. And the sensitivity of some individuals should be discussed but the heating efect is negligible compared to the modifications of the celular/ tissue specific metabolism. And at body level, there are eficient temperature regulation methods, therefore a temperature increase would hardly be observed. I' d expect to observe metabolic changes after prolonged exposure to magnetic field, even statical, which would be extremely hard to obtain within a fair approximation.

After more than 75 years of investigation, heating remains the only proven effect of non-ionizing electromagnetic waves on biological tissue.

See, for instance

Eleanor R. Adair, Fellow, IEEE, and Ronald C. Petersen, Fellow, IEEE,

Biological Effects of Radio-Frequency/Microwave

Radiation, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 50, NO. 3, MARCH 2002

James C. Lin, Life Fellow, IEEE

Cancer Occurrences in Laboratory Rats from Exposure to RF and Microwave

Radiation

IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology ( Volume: 1, Issue: 1, June 2017 )

Hi Pieter

I agree that in most cases only heating is considered.However there is one exotic exeption for pulsed Rf fields..the microwave hearing effect..which is maybe not dangerous but probably only annoying and not so reevant for the general public.

But for low frequency magnetic field nonthermal effects from the induced electric field eg in the brain play a very important nonthermal role.The induced voltage (ringintegral Eds)should not exceed a fraction of one volt

I recall that the pulsed microwave effect, where people report that they can hear radar transmissions, has been traced to heating of the bones in the inner ear. By very small temperature increments. Thus also a thermal effect. I will have to search for a reference.

I believe that even the microwave hearing effect has been shown to be due to heating of something in the head, causing rapid thermal expansion (thermoelectric effect) that results in the generation of sound waves in the head. See the attached paper.

Hi All

I note that the hearing effect is also discussed in the reference I gave above,

Eleanor R. Adair, Fellow, IEEE, and Ronald C. Petersen, Fellow, IEEE,

Biological Effects of Radio-Frequency/Microwave

Radiation, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 50, NO. 3, MARCH 2002.

This authoritative paper is well worth a read.

yes,of course , because our body is a micromagnetic field,so ,when we in a magnetic field, two magnetic field will have interaction,,magnetic field inside our body will have slightly changed because of the outside magnetic filed ,so ,it may influence our cycles of sleep e.t.c.

Yes, I do agree that the magnetic field has some influence on the body. "Magnetotherapy" is also considered as an alternative treatment for curing of some health problems like body pain.

Regards

Yes there are all kind of "magnetotherapy"versions...but not really accepted by mainstream science..a bit like homeopathy..if there is any beneficial effect its rather considered "placebo style" (by mainstream science) .According to the view of mainstream science all those claimed low level and low frequency bioeffects are at least not dangerous or significant. But many people have a huge phobia living close to high power transmission lines. And of coure there are many small electroncic devices for low level electromagnetic "self treatment". In order to better support the claims for the "non mainstream science"community a single well reproducible demo experiment would be useful..but does not exist so far to my knowledge.

Dear Dr. Fritz,

............ "non mainstream science"community a single well reproducible demo experiment would be useful..but does not exist so far to my knowledge.

Yes it is true. Regards

Hi all,

Have a nice day !

There is a very nice discussion about this topic following the link below.

https://physics.stackexchange.com/questions/64412/mris-and-electromagnetic-radiation/67825#67825

Hi Roland,

Have a nice time !

Furthermore, obviously I agree with most contributors and in addition to my small intervention i woul like to give you an affirmative answer to your question and invite you to take a look to the following files (in french).

When human body is exposed to electric field, the portions are affected. No significant effect was observed on human body on exposure to magnetic field alone. But adverse effect is seen on the human body when it is exposed to both electric and magnetic fields.

Hi Roland,

You will find enclosed below the following paper entitled :

"Measurement of Magnetic Field From an Induction Heating Hob and Estimation of Induced Current Density in Human Body ". Perhaps, this publication will help you.

Regards.

M. Akbi

And the following book entitled :

Electromagnetic Fields in Biological Systems

by James C. Lin.

Vipan, please give context and references.

The strength of the earth's magnetic field at the surface of the earth varies between 25 and 65 microteslas.

Are you referring to electromagnetic interference pertaining to implanted electronics? Certainly not a biological effect, surely?

If one say "magnetic field", it usually means a static magnetic field. As far as I know, static magnetic field has no observable influence to the human body. E.g., for MRI (magnetic resonance imaging) medical examination we use very strong static magnetic field of a couple Tesla that is generated by a powerful superconductive magnet. The magnetic field that is variable in time - it is in fact an "electromagnetic field" (although it may have very low frequency) will heat the human body to some extent, depending on the intensity and frequency. The heating mechanism are eddy currents in electrically conductive tissue and some polarization loses (dielectric heating) of the polar molecules. BTW, some animals (migratory birds) are sensitive also to static magnetic field as they use the geomagnetic field for the orientation. Allegedly, they have some ferromagnetic crystals in the brain...

Hello everyone,

I do not quite agree with Dr. Balaz, because, i know for example, that intensive researchs are actually being done in order to study the effect of the magnetic field on passengers of Maglev train. The magnetic field's influence to the human body depends on the strength of the magnetic field, exposure duration , nature of human tissues, ...

In this regard, please take a look at the publication below which here is a very short excerpt:

" According to criteria used by the International Agency for Research on Cancers (IARC), extremely low frequency electromagnetic fields have been identified as a “possible” human carcinogen . In addition to cancers, studies have found associations between EMF exposure and miscarriages, amyotrophic lateral sclerosis, and sleep disturbances."

So we must be very carefull about the health effects of magnetic fields in particular and electromagnetic ones in general. These phenomena are not yet well understood.

Regards.

Mohamed Akbi

Dr. Jan Balaz - Good information on the subject influence of magnetic field to the human body. Regards

Dr. Akbi - Different opinions - needs further research. But I agree with your view - " ........ we must be very careful about the health effects of magnetic fields in particular and electromagnetic ones in general as these are not yet well understood". Regards

The exposure of conducting meduims to a time varying magnetic field produces induced voltages that result in flow of currents in any formed closed conducting paths. Consequently, heat losses are generated. The time independent magnetic fields provide step potentials between their fixed field lines. These potentials result in flow of currents in any possible closed paths such as the circuit formed by two hands, and two fingers. For details use the following keywords: electical safety, step voltage, and touch voltage.

Mohamed Akbi, I think that the Maglev is a different case. The magnetic field is strong, not homogenous and the passengers are moving fast in this field, so that the electromagnetic induction is a case. With regard to the primary question " Does magnetic field can heat the human body?", the heating is generally caused by energy transfer to human body, where it is dissipated as heat. There is no energy transfer if the magnetic field is perfect static and the subject (human) is not moving in this field ("crossing the fieldlines"). So the heating will occur when magnetic field and the human are in some relative change. This may be negligible, e.g. movement in a weak geomagnetic field, hopefully in slow sliding of patient to strong field of MRI tomograph, it may be useful for medical treatment (magnetotherapy with pulse fields) - but also dangerous e.g. in front of a powerful radar or in microwave owen (some bad people already have put a small animal there - it was lethal).

Mohamed EL-Shimy

The "step potentials between fixed field lines" exist only inside digitized models for numerical analysis.

In the real world, fields vary smoothly and continuously except at the boundaries of certain materials.

"Field lines" are Faraday's imaginary construct to help us to visualize field intensities. They may, for instance, indicate contours of constant potential in a smoothly varying potential function. They do not exist in the real world.

Static magnetic fields do not induce currents in the inside of any material object.

Thank you Pieter Wilem for your feedback. Please note that the step potentials are known hazards to every power engineers. If one leg is separated by a distance from the other leg within the field produced by a current carrying conductors, then these legs are subjected to a potential that may cause current to flow in the body. These fields can also be measured, and plotted. Regardles of the smooth gradual weakness of the field as it is measured away from its source, two separated points at this direction have a potential difference. Thank you again for your feedback

By the way, there are many relevant standards (mostly related to safety and electrical hazards) describe the step and touch potentials, ways of measuring them, and measures for reducing thier impact. In addition, many software tools designed for the construction of earthing (or grounding) include related analyses of these potentials. For example, you may refer to the OTI website for detailed videos about these issues.

Prof. Srete has many publications and scientific work related to the electical safety, hazards, and arc flash. Therefore, he is specialized in that theme.

Hello again Ronald,

The heating of magnetic fluids using AC magnetic fields is presented in the following article

https://www.sciencedirect.com/science/article/abs/pii/S0304885302007060

Since the blood can be considered as a magnetic fluid, then it can be heated due to the exposure to AC magnetic fields.

Mohamed EL-Shimy

Agreed, Mohamed. What those people experience is the integral of the electrical (continuous) field intensity over the distance between their feet.

It is not a step change in the actual potential, you are just probing the mooth potential function at two different points and that of course gives a potential difference that can in some cases be hazardous.

That is why cows, with their feet spaced wide apart, are often fatally injured when lightning strikes a tree under which they may be standing. They experience the practical implication of the electric field intensity being integrated over a long path. :-)

On another point though, blood is not a magnetic fluid and is not heated by time-varying magnetic fields.

Hello everyone,

Thank you Jan Balaz for your feedback. In addition to my intervention, i would like to invite everyone to look to recommendations of the INTERNATIONAL COMMISSION ON NON‐IONIZING RADIATION PROTECTION, respectively in the following link and the file (ICNRP GUIDELINES ON LIMITS OF EXPOSURE TO STATIC MAGNETIC FIELDS) attached below.

https://www.icnirp.org/en/frequencies/static-magnetic-fields-0-hz/index.html

From ICNRP :

"Effects of static magnetic fields on the body and health implications

There are several known mechanisms by which magnetic static fields can influence biological systems. Magnetic fields not only exert physical forces on metallic objects but also on moving electric charges. With respect to biological functioning, exposure to static magnetic fields will affect electrically charged particles and cells in the blood when moving through the field. The magnetic force can accelerate or reduce the movement of susceptible particles. An example is a reduction in the velocity of blood cells flowing through blood vessels. A further mechanism is via complex electronic interactions that may affect the rate of specific chemical reactions."

In conclusion, further research on the effects of fields and electromagnetic waves on health is needed for a better understanding of these complex phenomena.

Thank you again Pieterfor your feedback. Indeed, the 'step potential' as a jargon used in the power engineering doesn't refer to the general term 'step change in the potential'.

Regarding the magnetic properties of the blood, may I ask you to read and comment on the following article?

https://www.sciencelearn.org.nz/resources/1010-does-blood-have-magnetic-properties

I agree with you Mohamed El-Shimy and send my greetings to all participants in this interesting discussion.

Moreover, with regards to the answer to the above question, i add another paper on the same topic and i invite Roland to read the following article :

https://aip.scitation.org/doi/abs/10.1063/1.3076043?journalCode=jap

Regards

Mohamed EL-Shimy

That is a very minor effect, not enough to cause heating. Please see the earlier discussions in this blog.

OK, but the main question didn't state the amount of temperature raise to be considered. In addition, the heating effects on many factors such as the field strength, the relative speed between the fields and the blood flow rate accompanied with the body motion, and field patterns.

I appreciate the main question, and enjoyed reading all comments.

Best regards,

M. EL-Shimy

Agreed!

The original question was put in the context of safety, and the blog is slowly digressing to what is measurable or observable.

So perhaps a new blog should be started around that theme. It will also be interesting. I think the safety theme has been covered satisfactorily.

regards

Pieter

So back to primary: "Does magnetic field can heat the human body? "

Static magnetic field - NO (or negligible, as there are some movements of electrically conductive items inside the human body)

Dynamic, alternating field - YES , but depends on frequency and intensity

Note to the sentence: "magnetic field can only heat magnetic materials" - ..... it is not correct.

1. Any static (not moving) material, regardless magnetic or not, is NOT heated in static magnetic field as there is no energy transfer.

2. Alternate magnetic field can also heat non-magnetic materials if they are electrically conductive. Alternate field will cause flow of eddy currents in the conductive material, there is an energy transfer - the heating occur. Depends on field intensity, frequency and material conductivity.

Dr. Jan Balaz - Good summary. Regards

Magnetic field can heat human organism if enough strong, but this is seldom the case. Mostly, we are exposed to fields that are much too weak to produce any measurable or detectable temperature effects. Yet they can have biological influence as conuntless researches from bioelectromagnetics demonstrate. Even a static magnetic field can have a biological infuence. There are many scientific articles reporting effects of that kinds. And the relation between the stimulating magnetic field and the organism is not linear; as Adey found, there are frequency and power windows. All this is due to the fact that our organisms are not only biochemical systems, but are also bioelectromagnetically active. In other words, our bodies (and of other organisms) have an endogenous electromagnetic field that reacts to a stimulating environmental magnetic field.

It is quite an interesting area to be discussed and is also an essential topic for human community. Today with the development of Hi-tech electronic gadgets and instruments which are able to detect the fine subtle vibrations in our surroundings, it has become possible for us to actually capture a glimpse of the human aura. The research on capturing this subtle energy field through electronic instruments was started by Semyon Kirlian, who accidently discovered that if an object on a photographic plate is connected to a source of high voltage, small corona discharges (created by the strong electric field at the edges of the object) create an image on the photographic plate. Slowly and gradually as more research was done in this field of Aura photography different technologies were developed claiming to capture the human aura or the electromagnetic field. But The frequency at which a magnetic field is pulsed determines whether or not it is harmful. For example, the frequency of the electrical current used in homes in the United States is 60 cycles per second, or hertz (HZ). In contrast, normal frequencies of the human brain during waking hours range from 8 to 22 Hz, while in sleep they can drop to as low as 2 Hz. The higher frequencies present in artificial electrical currents may disturb the brain's natural resonant frequencies and in time lead to cellular fatigue.

As regards electrophotogpraphy of the so called “aura” it should be said that there are interesting images of the missing parts of leafs (see https://www.researchgate.net/publication/271534350_The_Phantom_Leaf_Effect_A_Replication_Part_1 for more detail) that we, and according to my information also some other groups, were not able to repeat successfully, although dr. Korotkov showed me similar photos achieved by his special GDV system at the last Water Conference in Sophia (this was his own work and not the repetition of Hubacher’s research). But in normal cases the electrophotographic images only represent the display of surface electrical impedance via corona discharge. The discharge emits light in the form of corona and is an electrical phenomenon similar to lightning.

magnetic field can produced little current according to Faraday Law by changing flux.

I think due this current our body is heat up. If the strength of this current is high, human body will feel shock.

Hi,

Hence, a spatially varying MAGNETIC FIELD will induce a CONDUCTION CURRENT (by conduction as in a conductor) and a DISPLACEMENT CURRENT (by polarization).

Now the question is: is the resistance of our vital organs to the flow of either CONDUCTION or DISPLACEMENT current high? If it is high, then we don't need to be afraid! Or do we?

Please, correct me if I am wrong.

With Regards,

Suhas. D.

It is often forgotten that intense time varying magnetic, or electro-magnetic, fields do have a physiological effect. Very high magnetic fields can cause diversion of blood supplies to the brain and can result in unconsciousness. Likewise, the right frequency of microwaves will heat the water molecules in biological tissue. the biological effect of intense time varying magnetic fields must effect some properties of biological materials, particularly if they contain ferro-magnetic complexes like blood. Much depends on the properties of the bio material, be it ferro, dia or para magnetic.

rTMS influences brain in an indisputable physiological (physical) manner; its intensities are 0.3 – 2 T. But there are clinical research concerning PEMF stimulation (e.g. the ones of Pelka) showing that there can be demonstrable effects from much weaker fields, even in the unbelievable realm of few µT and even less. Here, of course we may ask ourselves if there is really the magnetic field at work. We should be open to new discoveries that would really and intelligently explain the effects of very low magnetic fields on organisms. Here, of course, we take into account that at least some of many published low magnetic field bioeffects articles were performed in a scientifically irreproachable way.

There are many magnetic field stimulatory devices on the market. If they are declared as a medical device, they must have a clinical study on humans for every stated indication. It is difficult to envisage that all this is based on counterfeit results.

Of Course,because the Nerve impulses are electrical energy signals; and, they creates energy-fields around the body and electro-magnetic energy waves that can travel away from the body. As electricity passes through a metal wire it causes an energy field or magnetic field. In a similar way, human electricity in the brain and nervous system creates human magnetic fields. There are billions of nerve impulses in the body and these are constantly creating complex human magnetic fields. The human heart is a source of electro-magnetism that, even at a few meters away, is detectable by modern scientific instruments. the heat related a parameters like frequency, amplitude and distance.

It might be because if the magnetic field is too large, the deflecting F = qvxB force that would inevitably act on any electrical signals within the nervous system, would become significant enough to have a harmful effect.

Salah-Eddine Houicher Nerve impulses are electrical energy signals; and, they creates energy-fields around the body and electro-magnetic energy waves that can travel away from the body.

This is of course true, but from the laws of induction it is known that it is difficult if not impossible for a nerve impulse to have sufficiently strong accompanying magnetic field to produce any effect on other nerve cells or axons above the noise level. And the all complexity of electrical streams in the brain would on the average produce a complex magnetic field, but I surmise it is more or less “meaningless”, only a sort of noise…

Nearly all our tissues are diamagnetic i.e they have negative susceptibility but we do have a few tissues which have small concentration of iron and copper which are paramagnetic and also some tissues with chunky iron conglomerates like ferritin. So when a time varying magnetic field is present there is a chance of induced currents which can cause some heating effect in those para and ferromagnetic tissues.

Shivan's reply confirms my comments noted above. The effects must be related to the magnitude of the induced fields.

Barrie Charles Blake-Coleman: The effects must be related to the magnitude of the induced fields.

In principle and if only mechanical physical effects would be in place this would hold. However, in bioelectromagnetics since the end of the previous century it has been well known that the biological effects do not follow stimulating EM fields in a linear fashion. Since Adey’s discoveries we know that the effects are subject to so called frequency and power windows (see for instance https://www.researchgate.net/publication/215658198_Biological_Windows_A_Tribute_to_W_Ross_Adey ). Therefore, while there is surely a physical force component of electromagnetic fields influencing biological tissue that should have linear effect on ions and molecules, the physiological effects are not necessarily related to the magnitude of the induced fields. There are clinical researches demonstrating that even with very low AC magnetic fields, much lower than the geomagnetic field, we may have important biological effects, see for instance Pelka, R.B. et al., 2001. Impulse magnetic-field therapy for insomnia: A double-blind, placebo-controlled study. Advances in therapy, 18(4), pp.174-180.

Yes, but Adey's 'power windows' were related to the magnitude of the induced fields. It is true that there are anomalous effects in biological tissues which are not directly related to the magnitude of the fields, but these depend on the immediate magnetic properties and proximity of the bio-material subject to these fields. Materials with ferro-magnetic properties behave entirely differently to those dependent on ionic or charge related action. The movement of blood under magnetic stimulus, for example, does not behave as the sodium pump in nerve axons subject to time varying magnetic fields. It all depends on how the material is composed and what determines its magnetic properties.

There are not only magnetic properties of tissues that count, but also endogenous electromagnetic oscillations that may interfere with the incidental magnetic fields. They represent the so-called Fröhlich–Bose–Einstein condensation that is a self-organizing dissipative structure, a phenomenon working in biological processes (see more in https://www.researchgate.net/publication/311869830_Phonon_Guided_Biology_Architecture_of_Life_and_Conscious_Perception_Are_Mediated_by_Toroidal_Coupling_of_Phonon_Photon_and_Electron_Information_Fluxes_at_Discrete_Eigenfrequencies or in other scientific literature on this theme).

Please check the link

https://gravityandlevity.wordpress.com/2015/01/12/how-strong-would-a-magnetic-field-have-to-be-to-kill-you/

Hi, Roland Macana I have a Job of specialist operative at a power plant, a few years ago I went to a simulator course in Toluca Mexico and the instructor had ear damage and had been diagnosed with ear damage due to the exposure of the magnetic fields.

Everything happens to speed of light, electrons does not accelerate or decelerate;

I like to think that magnetic fields could be associated with the development of the increase in diabetes rates.

It would be a matter of measuring certain area at the city with a gaussometer and correlating it with diabetes rate per area.

I leave you there another possible research topic! In this field of research so fertile

Regards!

Even if we suppose that the increase in diabetes rates are connected to magnetic fields, this should be thoroughly researched. There should be a more or less well-founded hypothesis that would connect diabetes (for instance the insulin resistance) to magnetic fields. And there should be also more or less clear which frequency or regime of stimulation the human organism should be exposed to for diabetes to develop. I think that the way of sedentary living and consuming food with a lot of sugar or carbon hydrates is far more suspicious than environmental (artificial or natural) EM fields. In my opinion, the latter may, however, help (only facilitate) in getting diabetes if we are already at a high risk to acquire it. But most probably these are high-frequency fields with variable frequency and amplitude, not the static ones.

Static magnetic field cannot heat human body or anything else. Alternating magnetic field (i.e. electromagnetic field) can cause currents in electrically conductive (e.g. due to electrolites) body tissues and some (local) heating.

I think Igor Jerman is right, he made a good point. But, there is need for very thorough studies on the effects of electromagnetic fields on life in general.

Constant magnetic fields become varying magnetic fields in our bodies if we move through them. There will be eddy currents if we move.

I think that if we fell through a very high magnetic field there would be eddy currents in our body that slowed us down. I think magnetic braking of things like fairground rides works like this (but not using peoples bodies). The work done in slowing us down would appear as heat somewhere - probably in our bodies.

Similarly, if we walk past a static field there will be some heating of our bodies.

I agree that things like diet and exercise and genetics are much more significant for diabetes. I think that the old British doctor's saying "fat, fair and forty" was a good risk indicator in the UK before a lot of Asian people started to experience our rubbish western diet and lifestlyle, and turned out to be even more susceptible to diabetes than we are, and also many more white people got even fatter sooner.

Both electric and magnetic fields induce voltages and currents in the body but even directly beneath a high voltage transmission line, the induced currents are very small compared to thresholds for producing shock and other electrical effects.

Heating is the main biological effect of the electromagnetic fields of radiofrequency fields. In microwave ovens this fact is employed to warm up food. The levels of radiofrequency fields to which people are normally exposed are very much lower than those needed to produce significant heating. The heating effect of radiowaves forms the underlying basis for current guidelines. Scientists are also investigating the possibility that effects below the threshold level for body heating occur as a result of long-term exposure. To date, no adverse health effects from low level, long-term exposure to radiofrequency or power frequency fields have been confirmed, but scientists are actively continuing to research this area. It is not disputed that electromagnetic fields above certain levels can trigger biological effects. Experiments with healthy volunteers indicate that short-term exposure at the levels present in the environment or in the home do not cause any apparent detrimental effects. Exposures to higher levels that might be harmful are restricted by national and international guidelines. The current debate is centred on whether long-term low level exposure can evoke biological responses and influence people's well being.

That's a good question

...From atoms to galaxies..in the form of a signal, geometry (shape), size, nature of its matter and everything will follow the rules..but How do they possess such an information eg: How is the atom forming the bonds?

...Do you have any idea How does one explain the final result (in particular, specific heat) for an elementary particle (eg. a fermion or boson) in relativistic motion?”

...If it is so when the distance between me and an atom is r, and the area of my eye is A, the probability of observing white light should be A /... more

...In that case (when looking over some time) one can say that electron tends to spend time in this or that part around the nucleus more...” more

...But in this case, the calculation gives the warning: "Madelung: WARNING: Charged system, but not an atom or molecule. modelling: WARNING: Energy correction terms can not be applied. Madelung: WARNING: Continue only if you really know what you are doing.

...“Basically, in the shell model, it is the same as in the atom: nucleons are fermions and must, therefore, have different quantum Status (or quantum numbers) if they are within the same potential.

...The Hilbert Book Model places elementary particles on their own private platform, which is a quaternionic separable Hilbert space that owns a private parameter space and contains an operator that manages the footprint of the particle in its eigenspace.

I am getting spin density value 0 on all the atoms, rather I am expecting to get some positive and some negative on atoms (though overall S would be 0 in the molecule). ... How to get individual spin densities of atoms in an overall S=0 complex containing two manganese(III) high spin atoms coupled antiferromagnetically through Oxygen ( or any other single atom)?

...Wheeler’s thought experiment is a variant of an experiment using two static slits, in which one of the slits may be closed after a photon passes through both slits, but before the photon has reached the screen.

...“I understood from the answers: we know that if gas molecules velocity through the valve come lower, the gas will be cooler, accordingly, when the net interaction between gas molecules is attractive, the expansion will decelerate gas molecules, therefore they will become cooler.

...As is well-known, the so-called averaged energy of two-electrons Coulomb repulsion U has been introduced both in the quantum theory of atoms/molecules and of condensed matter, which is typically defined, as is shown in the attached figure (a), - where the integral written there is taken over the whole 6-dimensional configurational space (r1=(x1, y1, z1) and r2 = (x2, y2, z2)).

...There is no sense for the integral if the potential energy does not get screened within a few lattice sites, or is in the case of the Hubbard model, screening within a distance slightly larger than the Bohr radius.

...My first question is: I know that in theory charge group is grouping atoms in order to get zero or an integer charge and that it has to be with as few atoms as possible.

...For the static orbital structure, techniques such as "laser-induced electron diffraction" [1], complemented by "quantitative rescattering theory" [2], or strong-field ionization momentum distribution imaging the orbital structures [3] for example can be used.

First of all, we have to distinguish the frequency of the phenomena, secondly the magnitude (i.e. intensity), thirdly for AC field we cannot say it is magnetic field solely as in fact it is associated with electric field producing the electromagnetic (EM) field.

For example, the AC field (50 Hz / 60 Hz) from the electrical grid wires influences the human body. There are strict regulations on how far from such wires people can settle.

With frequency increase, the EM field penetrates organisms less severely. For GSM frequency passband it penetrates the body to the depth of fractions of a millimetre.

Of course, this all depends on the magnitude of the field.

Not only electromagnetic radiation, but also an alternating magnetic field can generate an alternating electric field, fluctuations in the electrical subsystem and currents in the body => energy dissipation and thermal action of the current

Article Usable Frequencies in Hyperthermia with Thermal Seeds

Roland Macana

The low yielding magnetic field doesn't cause any significant heating Of cells © Copyrighted by James Mitchell All rights received

At low frequencies, external electric and magnetic fields induce small circulating currents within the body. ... The main effect of radiofrequency electromagnetic fields is heating of body tissues. There is no doubt that short-term exposure to very high levels of electromagnetic fields can be harmful to health.

http://cqm.rs/2016/cd1/pdf/papers/focus_1/38.pdf

https://www.ncbi.nlm.nih.gov/books/NBK208983/

https://physicstoday.scitation.org/doi/abs/10.1063/1.3069110?journalCode=pto

https://cds.cern.ch/record/1246526/files/p375.pdf

Electromagnetic radio frequencies act differently As radio frequency fields. Radiofrequency fields and yes can Cause Heating of the cell, tissue Because of the reaction to the pollution within the body Cell. Nevertheless, the magnetic field Cannot heat up the skin Or sell, it won't heat your skin up. Shortwave frequencies are the only frequencies that cause oscillation of the cell That causes friction within the cell which causes heating of the cell. For instance microwaves, All microwave transmissions. So please, Right Honourable gentlemen don't get mixed up between magnetic domains and radio fields. Magnetic frequencies and radio frequencies.

At low frequencies, external electric and magnetic fields induce small circulating currents within the body. In virtually all ordinary environments, the levels of induced currents inside the body are too small to produce obvious effects.

The main effect of radiofrequency electromagnetic fields is heating of body tissues. There is no doubt that short-term exposure to very high levels of electromagnetic fields can be harmful to health.

The magnetic field of one Tesla Levitated a frog. Utilising paramagnetic diamagnetic magnetism. The frog did not experience any damage. It is the frequency of the magnetic wave that is not damaged. Engendering Radio frequencies And of transmission This Is the deleterious one. Yet, only inimical At higher frequencies. I verbally express this, However, utilising transmitters of G5 Are the major quandaries. I would dote to tell you more, What, I can't. And then I'm going to have to leave you to In/win the dark on the subject. But trust you gentlemen Friends authentically appreciate heedfully aurally perceiving and reading your perspectives. In cognation To brotherhood And nature,

Static magnetic fields cannot heat the human body. Witness superconducting MRI scanners in which people are routinely immersed in quite strong static magnetic fields (>10 T) for extended periods with no ill effects. Electromagnetically, the human body is an insulating bag filled with salt water. Hertzian waves (i.e., radio waves at various frequencies) transmit energy through the insulating skin as a Poynting vector consisting of time-varying electric and magnetic fields. Your question seems to be directed at extremely low frequency (ELF -- 3 Hz to 30 Hz) or ultralow frequency (ULF --

it follows from the context that heating is still meant, but perhaps also for the purpose of healing

A useful paper can be recommended for your question.

https://www.ncbi.nlm.nih.gov/books/NBK208983/