The electrostatic potential on the surface of uniformly charged spherical shell of radius R =10 cm is 120 V. The potential at the centre of shell, at…

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