I am working on the concept of 'force on a current carrying conductor in magnetic field' for which I need to generate approx. 1-D magnetic field. Would an assembly of solenoids be a good option or is there an alternative?
Hi dear mohd sadaf. using selonoid for high magnetic field has a little problem u must solve depending on how much tesla u want. For achieving high magnetic field u should use high voltage and when a magnetic field is generated first of all the current running through the coil generates the magnetic field, but the magnetic field pushes back the electrons flowing through the coil. The stronger the current, more electron push back by the magnetic field , and once the current get to a certain threshold the magnet will quite literally tear itself apart. A solution for this is using a superconductors that shuttle electrons around with zero resistance (it will be a little expensive) another way is to use a layered copper coil . if preparing a high energy magnet is ur goal u can test using carbon fibers (for useful properties of carbon nanotubes as lets say heat holes or coolers beside magnetic properties). Good luck . P.S. copper coil withstand around 20 to 25 teslas I think if designed properly.
hi again!
You know that for a horizontally placed conductor u should apply magnetic field vertically so electric and gravitational fields are defined as the force on unit charge or mass. Then B = F/IL, (f: force,i:current in conductor, L : length) and this gives a way of defining the "magnetic field strength" magnetic flux density which has units of N A-1 m-1 or tesla (T).
A field of 1T is a very strong field while the Earth's magnetic field is about 10-5 T. Other thing u should count is area and time of applying B. I suggest to buy a second hand superconducting NMR spectrometer and tune the field down to the required range. You need to use liquid helium and nitrogen for cooling purpose( it is used in hospitals and clinics) . In case u insist to build ur magnet yourself u can use paper below ( alittle complicated one) to design ur apparatus or keep track of keyword of this paper to find appropriate design.
http://iopscience.iop.org/1742-6596/400/5/052038/pdf/1742-6596_400_5_052038.pdf
Suppose your experiment is designed for presentation purposes only, and usage of the expensive equipment should be avoided. The field generated by a solenoid (perhaps two Helmholtz coils would be preferred, as they generate much more uniform field between them) will be, for all practical reasons, of order 30-50 mT or less. Inserting a soft magnetic core inside your solenoid should improve the field 10 times or even more. Next you should think about your "current carrying conductor". Perhaps a single copper wire (ribbon?), with, say 1A current, may appear insufficient. Instead of DC current in your solenoid you can consider a pulsed mode of operation with much higher current (by discharging a capacitor). Then, however, you should be ready for making such a discharge unidirectional, not oscillating.
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