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Magnetic field at a point d distance away from long wire due to electric current i in it is ____________

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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/πr

I 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

1 Answer

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Best 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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