1. The problem statement, all variables and given/known data Three point charges +Q are placed at three corners of a square, and a charge -Q is placed at the fourth corner. If Q = 1.00 milli-coulomb and the side of the square has length 1.00 m, find the magnitude of net force that the positive charges exert on the negative charge. |F|= 2. Relevant equations F = kq1q2/d2 k = 8.99 x 109 N-m2/C2 3. The attempt at a solution I've tried this problem three times and i only have 2 more attempts to get it right so can anyone help me with this?