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A charge Q is distributed over two conce...

A charge Q is distributed over two concentric conducting thin spherical shells radii r and R `(R gt 1)` . If the surface charge densities on the two shells are equal, the electric potential at the common centre is:

A

`KQ(1/r + 1/R)`

B

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

C

KQrR/(R+r)

D

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

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The correct Answer is:
B
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