Q.

The magnetic moment of a circular coil carrying current is

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a

Directly proportional to the square of the length of the wire in the coil

b

Inversely proportional to the length of the wire in the coil

c

Inversely proportional to the square of the length of the wire in the coil

d

Directly proportional to the length of the wire in the coil

answer is C.

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Detailed Solution

M=NiA  M    A    M  r2As  l=2πr  l    r  M  l2

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