Problem 3 (25 pts) - A charge q1 = +4.5 nC and q2 = -7.80 no are 0.1 meters apart. Point A is half way between q1 and (12; Point B is radially 0.08 m from q1 and radially 0.06 m from qz. (See diagram below) A) Find the electric potential at pointA (6 points) B) Find the electric potential at point B (6 points) (3) Find the work done by the electric field on a +3.0 nC charge which travels from point B to point A (7 points) (0 09% 0.05m A 0.05m 0 Eight point charges are arranged at the corners of a cube with side D = 0.25 meters. Each charge q = +l- 1.6 x 10'19 C. D) Calculate the potential energy (U) of this arrangement (6 points)