A charge \(Q\) is distributed over three concentric spherical shells of radii \(a, b, c (a b c...

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A charge \(Q\) is distributed over three concentric spherical shells of radii \(a, b, c (a b c)\) such that their surface charge densities are equal to one another. The total potential at a point at distance \(r\) from their common centre, where \(r a\), would be
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