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A square loop of sides L is placed at ce...

A square loop of sides L is placed at centre of a circular loop of radius r (r << L) such that they are coplanar, then mutual inductance between both loop is

A

`(mu_0L)/(4r)`

B

`mu_0L/(2r)`

C

`mu_0L^2/(4r)`

D

`mu_0L^2/(2r)`

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