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A circular loop of radius r is placed at...

A circular loop of radius r is placed at the center of current carrying conducting square loop of side a. If both loops are coplanar and a >> r, then the mutual inductance between the loops will be

A

A. `(µ_0r^2)/(2sqrt2(a))`

B

B. `(µ_0r^2)/(4a)`

C

C. `(2sqrt2 µ_0r^2)/(pi a)`

D

D. `(µ_0r^2)/(4sqrt2(a))`

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