A point charge of +Q is placed at the center of a square, and a sec
m,s kb n dh.+ zby8vaayay.+99ond 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 the center. What is the magnitude of the force that
+yvabm s9,8an zad 9.y yk+.bhacts on the center charge if a third charge of -Q is placed at the lower-left corner?