A point charge of +Q is placed at
zadpruz gzp:69:p 0n* 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 N acts on the positive charge at the center
ur9 0pad:*pz: znzg6p . 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?