A point charge of +Q is placed at the center of a square, and a second point
6 t6uglqfa.8.bzyy+ scharge of -Q is placed at the upper-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
yg fzb.8alyq su6.+t6 center charge if a third charge of -Q is placed at the lower-left corner?