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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

BAAμ0π

b

BAAμ0

c

BA2μ0π

d

2BAμ0Aπ

answer is D.

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Detailed Solution

magnetic moment is M= iA ,B=μ0i2r    ⇒i=2rBμ0

    A=πr2    ⇒r=Aπ
M=2rBμ0A=2Bμ0AπA

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