Two point charges with charge +10 pc and-5 pc are separated by 15 m. calculate the potential at a point a that is 1 m from the positive charge on the line between the two charges a. b. calculate the position on the line between the charges at which the potential is zero c. calculate the potential at a point b that is 1 m from the negative charge on the line between d. explain, in terms of the work done by the electric field, what would happen to the potential the two charges energy of a test charge if it was moved from point b to point a. recall the test charges are always positive.