a. the work done by the electric field in moving the proton from that point (a) to point (b) is 1.6 x 10-14 j. point a is at a distance of 5.0x10-2m from the center of charge q. point b is at a distance of 1.0x10-1 it moves away from the large charge. is q positively or negatively charged? a. the work done by the electric field in moving the proton from that point (a) to point (b) is 1.6 x 10-14 j. point a is at a distance of 5.0x10-2 m away from the center of charge q. calculate the potential difference between points a and b.