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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BA2μ0π

BAAμ0

BAAμ0π

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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