1. The problem statement, all variables and given/known data There are Cl+ ions at the corners of a cube of side a = .4nm and a Cs- ion at the center. a) What is the net force on the Cs- ion? b) What is the electric field at the center of the cube cause by all of the Cl ions? c) What is the electric potential at that point? 2. Relevant equations F = kq1q2 / r2 E = kq / r U 3. The attempt at a solution a) Since each force has an equal force from the opposite corner, I think the net force should be 0. (seems too easy for a test problem, so please let me know if i'm wrong.) B) For the same reasons as above, wouldn't E be 0? C) really not sure where to go with this, guessing its an integral relying on the change in distance from each corner going from start position to infinity, and the the sum of those forces for each 8 corners. Since it could move in a straight line through one of the faces, there would be 2 sets of 4 equal integrals, so i've gotten 4√(3)a/2∫∞Edr + 4-√(3)a/2∫∞Edr but even if this is right I have E = 0 so I can't do this.