Q 12-02-025NEETJEE MainMedium
A hollow metal sphere of radius $10$ cm carries a charge that makes its surface potential $80$ V. The potential at its centre and at $20$ cm from its centre are
Answer: (B) $80$ V and $40$ V
Inside a conducting shell the potential equals the surface value, $80$ V. Outside, $V \propto \dfrac{1}{r}$: at $20$ cm it is $40$ V.
Solution by Sreeraj P, M.Sc Physics