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Q.

A wire of length 6.28m is wound into a circular coil of radius 10 cm and carries a current of 1A. Its magnetic moment is

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a

0.314 Am2

b

1.256 Am2

c

0.628 Am2

d

2.512 Am2

answer is A.

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Detailed Solution

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M=NiA n(2πr)=ln(62.8)=628n=10M=10×i×π×0.01M=0.314Am2

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