A point charge of +Q is placed at the center of a square, and
eezp gow5i+/y3 rf1m*3 wk3jn2 pq*asa second point charge of -Q is p
13e /a rpjof* nww+kgpm52 q3 3syz*ielaced 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 center charge if a third charge of -Q is placed at the lower-left corner?