An initially neutral conductor contains a hollow cavity in which there is a + 65.0 nC point charge. A charged rod transfers - 75.0 nC to the conductor. Afterwards, what are the charges along the inner surface and the exterior surface? I understand that the charges from the rod are equally distributing itself across the volumes, but I don't know how the numbers will play into this...at all. I do know that the inner wall surface should be negative due to the 65nC point charge, and the outside must be positive due to the fact that this is a neutral conductor. ANY formulas dealing with this type of problem would be greatly appreciated!!!