A point charge of +Q is placed at the center of a square,
v9 p -*:xbm-sddsjr hdlk(rwq((- j/cand a second point 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 charge at the center. What is the magnitude of the force that acts on the center c
-:s(w c(/* jv s(rrdddm9 xqj-phk-blharge if a third charge of -Q is placed at the lower-left corner?