Point charges q1=+2.00?C and q2=?2.00?C are placed at adjacent corners of a square for which the length of each side is 4.50cm. Point a is at the center of the square, and point b is at the empty corner closest to q2. Take the electric potential to be zero at a distance far from both charges.
What is the electric potential at point b?
A point charge q3 = -5.00?C moves from point a to point b. How much work is done on q3 by the electric forces exerted by q1 and q2?