The electrostatic potential on the surface of uniformly charged spherical shell of radius \(\mathrm{R}=10\mathrm{cm}\) i…

The electrostatic potential on the surface of uniformly charged spherical shell of radius \(\mathrm{R}=10\mathrm{cm}\) is \(120\mathrm{V}\) . The potential at the centre of shell, at a distance \(r=5\mathrm{cm}\) from centre, and at a distance \(\mathrm{r}=15\mathrm{cm}\) from the centre of the shell respectively, are :