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A small coil of radius r is placed at th...

A small coil of radius `r` is placed at the centre of a large coil of radius `R`, where `R gtgt r`. The two coils are coplanar. The mutual inductance between the coils is proportional to

A

`(r)/(R)`

B

`(r^(2))/(R)`

C

`(r^(2))/(R^(2))`

D

`(r)/(R^(2))`

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The correct Answer is:
B
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