A point charge of +Q is placed at the center of
x,zckn8;4nvh -wi7bqz0z t,k a square, and 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 t
xbz40t7kz hiv-z, 8n ,qwkc;n he 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?