A solid metal ball of radius 1.5 cm bearing a charge of -16 nC is located near a hollow plastic ball of radius 2 cm bearing a uniformly distributed charge of -4 nC on its outer surface. The distance between the centers of the balls is 8 cm.
What is the electric field at the center of the metal ball due only to the charges on the surface of the metal ball?
The Attempt at a Solution
am I missing something, because I though that the electric field due to surface charges inside a conductor is zero, therefore shouldn't the answer to this question be the zero vector. I must be missing some concept because the question before this one asks about the net E field and I know that is zero, so how would I figure out the electric field due only to the surface charges. Should I treat the surface as a hollow sphere, that doesn't seem right either.