A point charge of +Q is placed at the center of a square, and
szy;trszj- 4 3) jywc+ 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 for
w -;3tys+ycr4z z)j jsce that acts on the center charge if a third charge of -Q is placed at the lower-left corner?