A point charge of +Q is placed at the center of a square, a
l lmx /9cji0t7nd a second point charge of -Q is placed at the upper-left corner. It is observed that an electr
cmxt0j 7/i 9llostatic 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?