Ok, the problem states: there are four charges, each with a magnitude of 2.0 uC. Two are positive and two are negative. The charges are fixed to the corners of a 0.30 m square, one to a corner, in such a way that the net force on any charge is directed toward the center of the square. Find the magnitude of the net electrostatic force experienced by any charge. Anyway. I think that it is like this + - + - So since the only attraction I see is : one positive to two negs, one across and one diagonal, no vertical but repulsive force. So I do my components... Fx=kQq/r^2 = 8.99x10^9 (2.0x10^-6C)(2.0x10^-6C)/(0.30^2) = 0.3995 N. Since I got my x component and my y, essentially same, I do pythagoras and get the answer 0.56497 N for the net force. Ideas? Thanks!