A point charge of +Q i
tz tg/; v0;k/a ij4ucjs placed at the center 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
aiz /c t;gk;04v/jjut 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?