Use k = 9.0 109 N m2 / C2. Four charged balls are arranged so that there is one ball at each of the four corners of a square. Charge of top left corner ball is -Q, charge of top right ball is 5Q, charge of bottom left ball is 4Q and charge of bottom right ball is -3Q. Use these numbers: L = 12.0 cm, and Q = 16.0 nC (nanocoulombs). Calculate the magnitude of the net force exerted on the -Q charge by the other three charged balls. _______ N. Calculate the magnitude of the net electric field at the center of the square, because of the four charged balls. ______ N/C. Solve for answers