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Work done in moving a positive charge from the centre of a hollow uniformly charged sphere to its surface is zero. Does it imply that the potential is zero inside the sphere?

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No, potential is not zero but it is constant from the centre to the surface of a hollow uniformly charged sphere. This is because electric field inside a hollow uniformly charged sphere is zero. So, it is an equipotential volume and hence electric potential is the same inside and on the surface of the sphere.
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