A point charge of +Q is placed at the
w cbeos.bln(l9: q40 b bcs)tdz;h )+f center of a square, and a second point charge of -Q is placed at the upper-left corn
on )zbb 0b)c +sell9 w;cht:4fs.(d bqer. 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 charge if a third charge of -Q is placed at the lower-left corner?