A point charge of +Q is placed at the center of
ovw s,t b 5ki-m/0p xk39np.nc a square, and a second point charge of -Q is placed at
.nikvnp-xb skm w,cop0/395t the upper-left 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?