A point charge of +Q is placed at the center of a
i )u;osahw,1fsquare, and a second point charge of -Q is placed at the up
hau)w,;1 fsi oper-left corner. It is observed that an electrostatic force of 2.0 N acts on the 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?