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Alternating Current Applied to an Inductor

A square cond...

Question

A square conducting loop of side L is situated in gravity free space. A small conducting circular loop of radius r ( r < < L) is placed at the center of the square loop, with its plane perpendicular to the plane of the square loop. The mutual inductance of the two coils is

A

\frac{2 \sqrt{2} μ_{s} I}{L} r^{2}

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B

\frac{\sqrt{2} μ_{s} I}{L} r^{2}

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C

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D

None of these

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