Q.

Magnetic field at the center of a circular coil is B. If area of the coil is A  then magnetic moment of the loop is

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a

BA2μ0π

b

BAAμ0

c

BAAμ0π

d

2BAμ0Aπ

answer is D.

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Detailed Solution

magnetic moment is M= iA. ,B=μ0i2r    =2rBiμ0    A=πr2    r=AπM=2rBμ0A=2Bμ0AπA
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Magnetic field at the center of a circular coil is B. If area of the coil is A  then magnetic moment of the loop is