A coil of radius r is placed at the cent...

A coil of radius r is placed at the centre of R>>r and coils are in same plane.The coefficient of mutual inductance between the coil is

`mu_0 πr/(2R)`

`mu_0 πr^(2)/(2R)`

`mu_0 r/(2piR)`

`mu_0 πr^(2)/(2R^(2))`

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