A point charge of +Q is plac
*jlgco*2ugv7v/z i b,ed at the center of a square, and a second point charge of -Q is placed at the upper-left corner.
ui2c vb 7zg/o,*gl*vj 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?