2. A point charge Q is placed at point P at a distance
R from the centre of a metallic spherical shell of
inner radius 2R and outer radius 2.5 R. The electric
potential at the centre of the shell will be
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If it is a solid conducting sphere:
In the static condition, there is no electric field and no net charge at any point inside a conductor. The charge must appear at the surface of the conductor. Potential V at the centre or any point inside it is same and its value is that at its surface (a conductor is an equipotential volume). Hence
V=14πϵoqR
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