what is the electric potential at point B?

earning Goal = 400 nC , gy = 3:00 nC , and ga - 7:00 nCare mars of a square whose side measures a - 4:00 m . Point are diagonally across from or Point D lies at the values of the electric potential at point A and at point 87 is required to move a test charge gr - 2 00 DO from of electric potential is chosen to be at infinity