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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Isha lohan 1
This man is probably running with the speed of electrons in the conductor. And not with any speed near to speed of light, so we do not need to apply relativity here. This is a normal situation. The magnetic field at r distance from infinite wire is equal to. B=u*I/ 2pie*r as given in option a. Now if any one move parallel to the wire, the magnitude of magnetic field with not chage at r distance. So observer should observe the same constant magnetic field. It's not given observer is any charged particle so, any neutral particle do not experience extra force or anything from dynamic concept. Think is from static view.