A point charge of +Q is placed at the center of a square, an
5/+tqqx(g8-)hvkwsrm i:8yfj r4 yfid 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 th
5q/tii4 :xw 8jfmrs+ry-fv 8)y(gkhqe 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?