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Q.

A circular loop has a radius of 5 cm and it is carrying a current of 0.1 A. Its magnetic moment is

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a

1.32×10−4ampm2

b

2.62×10−4ampm2

c

5.25×10−4ampm2

d

7.85×10−4ampm2

answer is D.

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Detailed Solution

m=IA=IπR2=(0.1)×π×5×10−22=7.85×10−4amp−m2
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A circular loop has a radius of 5 cm and it is carrying a current of 0.1 A. Its magnetic moment is