A point charge of +Q is placed at the cente
uy(f m61e s)l4i7 gwp0ye5snl r of a square, and a second point charge of -Q is plac
76s uipys0fg1e wn4lme( y)l5 ed 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?