A point charge of +Q is placed at the ce
etrbse )c4a42y r 9*hv0bj5 cznter of a square, and a second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic fo
) bcr54e0js9zyb c a*24evtrhrce 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?