A point charge of +Q is placed at
pxx: qlkqhpwfpm)7 yn) n,m17;*emlyv8 j :y2the center of a 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 cha
:m:yf8 1n)xlq)h2 k7p j x;mpv7n lw*y ymq,eprge if a third charge of -Q is placed at the lower-left corner?