A point charge of +Q is placed at the center of a square, an
wy8n0uuu7c4vi12 wpb d 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
u8uu cyiw4p 7wv1 b02nat 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?