A point charge of +Q is placed at the center of a square, and
ptn(9-sbjha x,0ub7ka second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2.0 N acts on th
tnk0-as h ,7upj(bb9xe positive charge at the center. What is the magnitude of the force that acts on the center charge if a third charge of -Q is placed at the lower-left corner?