A point charge of +Q is placed at the center of
tzr,1wqk t o 5iljh8vas7)54 ja 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. What is the magnitude of the force that acts on the center charge if
j7v84ka5lr h5 qwjoz 1st,)it a third charge of -Q is placed at the lower-left corner?