A point charge of +Q is placed at the ce
lphc6 (ye(mch3 m5 vcb4v*7innter of a square, and a second 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
nh 7c6 mhl*ec ( vci(b4py3mv5 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?