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Two conducting circular loops of radii `R_1 and R_2` are placed in the same plane with their centres coincidingt. Find the mutual inductane between them assuming `R_2ltltR_1`.

A

`R_1//R_2`

B

`R_2//R_1`

C

`R_1^2//R_2^2`

D

`R_2^2//R_1`

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D
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