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

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

A

A. `mu_0 πr/(2R)`

B

B. `mu_0 πr^(2)/(2R)`

C

C. `mu_0 r/(2piR)`

D

D. `mu_0 πr^(2)/(2R^(2))`

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