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A solid sphere ofradius 'R' is uniformly...

A solid sphere ofradius 'R' is uniformly charged with charge density `rho`in its volume. A spherical cavity of radius `(R)/(2)` is made in the sphere as shown in the figure. It is given that `(rhoR^(2))/(in_(0)) = 48 V`. Find the electric potential at the centre C of the sphere:

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