A hollow metal sphere of radius 8 . 1 cm carries a charge 1 . 6 4 C . What is the electric field

 A hollow metal sphere of radius $8\mathrm{.}1$ cm carries a charge $1\mathrm{.}64$ μC$.$  What is the electric field strength, E$,$ in N$/$C at a point a distance $15\mathrm{.}8$ cm away from its surface? Use $"$e$"$ notation for your answer.