When a charge is placed on a metal sphere, it ends up$,$ in equilibrium, distributed uniformly over the outer surface. Use this information to determine the electric field of $4\mathrm{.}0C$ charge put on a $5\mathrm{.}0$ cm radius aluminum spherical ball at the following two points in space:

a$.$ a point $3\mathrm{.}0$ cm from the center of the ball $($an inside point$)$: the magnitude of the electric field is N$/$C$.$

b$.$ a point $19$ cm from the center of the ball $($an outside point$)$: the magnitude of the electric field is N$/$C$.$