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Moving Charges and Magnetic Moments 
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#19
Feb1813, 10:10 PM

P: 109

Probably not possible, but there's a detour. This donut shaped motion of the charge will be equivalent to current flowing through a coiled wire. And we all know the magnetic moment in such a situation. 


#20
Feb1813, 10:36 PM

P: 118

Right! That is what I was thinking! Thank you very much deep838!! (:



#21
Feb1813, 11:49 PM

Mentor
P: 11,864

Do a Google search for "magnetic field of a moving point charge" and "magnetic field of a dipole". 


#22
Feb1913, 02:16 AM

P: 109

but then again, coming back to your original question, i don't think that any type of motion will have a magnetic field!
the charge in circular motion is a very special case! 


#23
Feb1913, 02:47 AM

P: 900

yes moving charges produce a magnetic field.
you can explicitly see this when you have a static charged particle in one frame moving relative to another frame. in relativity, neither electric fields nor magnetic fields are invariant in different frames, but the electromagnetic tensor is. You take the Lorentz transformation of the electromagnetic tensor that describes a static charged particle in the rest frame in order to transform it into the moving frame and write out the terms explicitly. You will find that the B'[itex]_{i}[/itex] terms in the moving frame will have nonzero components related to the E field in the rest frame. 


#24
Feb2013, 12:15 AM

P: 109

i meant "magnetic moment". really sorry for that. So, does any type of motion have a magnetic moment? 


#25
Feb2313, 03:20 PM

P: 118

Actually jtbell, I did the search and they look exactly the same. The only difference is that a point charge has an infinitetismally small distance between it's two magnetic poles.



#26
Feb2413, 04:59 AM

P: 109

everyone, u r all diverting to a different problem here! we started with magnetic moments and lets stick to that in this thread! start a new one for others!!



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