A point charge of +Q is placed at the center of a square, and a secon
n.h: r adc 7dyctkfa77x diz4,t9g.q,d point charge of -Q is placed at the upper-left corner. It is obse
7a.t hx97a 7tdq:ydkgn,z cci ,.df4rrved 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?