A point charge of +Q is placed at the center of a square,
w7 exh;mt twkz.bq-d 6a /vj;.w gh*r. and a second point charge of -Q is placed at the upper-left corner. It is observed that an electrosta
h.kmwv tr.7-z dxweh g 6tw/;*;qab.jtic 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?