hOW DO MOVING CHARGES PRODUCE MAGNETIC FIELDS? THEY TELL IT IS BCOS OF RELATIVITY.....BUT HOW EXACTLY???

Question

hOW DO MOVING CHARGES PRODUCE MAGNETIC FIELDS?     THEY TELL IT IS BCOS OF RELATIVITY.....BUT HOW EXACTLY???

turingtest · Answer

You're not going to get much of a clear-cut answer on this one. I'm not even sure what relativistic relationship you are referring to, but electricity and magnetism are essentially two sides of the same coin, and magnetism at its most fundamental level is usually regarded as a quantum phenomenon, relating to concepts like electron spin, symmetry, etc. At least that is the extent of my understanding.

masumanwar · Answer

moving charge produce magnetic field as magnetic force is F=qvB

roadjester · Answer

Faraday's Law of Induction in differential form is
gradient X E = -(partial B)/(partial t)

Ampere's Law in differential form is
gradient X B =[ (mu_0) j] + [(epsilon_0) (mu_0) (partial E/ partial t)]
I'm not sure what kind of answer you're looking for but I think @TuringTest and @masumanwar both gave pretty clear cut responses

anonymous · Answer

Well.. what he is saying is right.. 

imagine you have a current carrying conductor.. and there is a moving charge, next to that conductor |dw:1391757333025:dw|
then the charge will experience a force UPWARDS... towards the conductor.. 
this is the magnetic force given by F = q(V cross B)
which immediately tells u it depends on velocity

Now forces which depend on velocity is really difficult to understand.. why you ask? .. i am glad u asked.. 
cause VELOCITY is a relative concept.. 
so if the observer is also moving with the charge in the same direction with same speed, then RELATIVE to him, the charge is at rest.. so HE would say .. "ayye.. the magnetic force must be zero"

but wait o wait.. FORCE is not relative.. he will definitely see the charge being attracted towards the conductor.. 

so how can he justify that? :O

thats the question AntonyStark is trying to ask.. (atleast i hope) :D