Three point charges with values q1 = 8.00 nC , q2 = 3.00 nC , and q3 = 7.00 nC are placed on three consecutive corners of a square whose side measures s = 3.00 m . Point A lies at the fourth corner of the square, diagonally across from q2. Point B lies at the center of the square. What are the values of the electric potential at point A and at point B? How much energy (supplied as work) is required to move a test charge q4 = 2.00 nC from point A to point B? Assume the zero of electric potential is chosen to be.