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Magnetic field at a point d distance away from long wire due to electric current i in it is ____________(a) µ0i/2r(b) µ0i/r(c) µ0i/2πr(d) µ0i/πrI had been asked this question by my college director while I was bunking the class.This intriguing question comes from Magnetic Field Due to an Electric Current topic in portion Electromagnetism of Basic Electrical Engineering

Answer»

The correct choice is (C) µ0i/2πr

The EXPLANATION: Magnetic FIELD at distance d from LONG wire with carrying current i is given by-

B = µ0i/2πr.



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