A point charge of +Q is placed at the cen
g/6*4roq +wyr6k+ hf q,acno bter of a square, and a second point charge of -Q is placed at the upper-
o obfcr/6yk * 6+,agqqhrw+n4left 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?