Write an equation for the potential at a point in a uniformly charged spherical shell.

(N/A) For a uniformly charged spherical shell of radius $R$ and total charge $Q$:
$1$. Outside the shell $(r \ge R)$: The potential is given by $V = \frac{1}{4\pi\epsilon_0} \frac{Q}{r}$.
$2$. Inside the shell $(r < R)$: The electric field inside a charged spherical shell is zero. Therefore,the potential is constant and equal to the potential at the surface. The potential is given by $V = \frac{1}{4\pi\epsilon_0} \frac{Q}{R}$.