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A charge Q is distributed over two concentric hollow spheres of radii r and R (>r) such that the surface

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A charge Q is distributed over two concentric hollow spheres of radii r and R (>r) such that the surface densities are equal and placed on the same axial points. Then the potential at the common centre is

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Correct option  (d)

Explanation:

Let the charges on spheres of radii r and R be q1 and q2 respectively. Then Q = q1 + q2 . The potential at the centre will be :

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