A point charge of +Q is placed at the center
//al5tl.l mlo3a7w3ekqto r7 of a square, and a second point charge of -Q is placed at the upper-l
e7ll3olqw. //m35or7 t lkataeft corner. 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?