A point charge of +Q is placed at the center of a square, and a second poin
xo t;k3,9ib git charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2.0 N acts on the positive
,ibxti ;g39ko 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?