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Two concentric and coplanar coils have r...

Two concentric and coplanar coils have radii a and `b ( gt gt a)` as shows in Fig. Resistance of the inner coil is `R`. Current in the outer coil is increased from `0` to `i`, then the total charge circulating the inner coil is

A

`((2mu_0i)/(pib))a^2/R`

B

`((2mu_0i)/(b))(pia^2)/R`

C

`((mu_0i)/(b))(pia^2)/R`

D

`((mu_0i)/(2b))(pia^2)/R`

Text Solution

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The correct Answer is:
D
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