Capacitors and dielectrics pertain electric phenomena, one could say that inductors can be considered analogues of capacitors in the magnetic case.
Is there a dielectric analogue in magnetism?
What about dielectric relaxation in electricity, is there any such thing as magnetic relaxation? Can it be magnetic hysteresis?
The analogue to the medium (dielectric) between the plates of capacitors is the core inside coils. While the effect of the dielectric depends on its permittivity, the effect of the core depends on its permeability. In both cases, the medium is polarized by an externally applied field.
Of course, media between capacitor plates and media inside (and around) coils are only the two simplest configurations. Electrically or magnetically (or both) polarizable media can be located anywhere in electromagnetic near fields and far fields, thereby modifying, reflecting, absorbing (and so on) the fields.
There are several types of magnetic relaxation (nuclear, electron, ferromagnetic) but while relaxation refers to the process of reaching an equilibrium after a change of conditions, hysteresis involves a (possibly) permanent state, dependent on the past. So, there could be hysteresis without relaxation, and vice versa.
Diamagnetic materials are the magnetic equivalent to dielectrics. Paramagnetic and ferromagnetic materials are similar, but the effect has the opposite sign.
Hysteresis is equivalent to relaxation. See wikipedia.
Dear Pandey, You can find the answer to your question in the definitions of the electrical medium parameters and in the duality relations in Maxwell equations.
Ferromagnets have permeability, just as dielectrics have permeability. Magnetic cores are used in transformers and other electro-magnets.
Magnetic materials experience larger hysteresis at faster speeds because of Faraday's Law (eddy currents).
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Electromagnetism