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A square loop of side length l is placed...

A square loop of side length l is placed at centre of another square loop of side length L. (`Lgt gtl`). Mutual Inductance of loops is equal to

A

`(2 sqrt(2) mu_0 l^2)/(pi l)`

B

`(mu_0 l^2)/(pi l)`

C

`(mu_0 l^2)/(2 sqrt(2) pi l)`

D

`(sqrt(2) mu_0 l^2)/(pi l)`

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