Q.

A wire of length L metre carrying a current of l ampere is bent in the form of circle. Its magnetic moment is

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a

1L2/4πAm2

b

I L2/4Am2

c

IπL2/4Am2

d

21L2/πAm2

answer is A.

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Detailed Solution

Length of wire, L = 2πRRadius of loop, R=L2πMagnetic moment, M = IA                                       =1πL24π2=IL24πAm2
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A wire of length L metre carrying a current of l ampere is bent in the form of circle. Its magnetic moment is