A point charge of +Q is placed at the center of a square, and a
: dbkthuq(fjm* 5 35vd second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2.
qjk:bthduv3f(*5 d 5m0 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?