Acharge q of magnitude 6.4 × 10^-19 coulombs moves from point a to point b in an electric field of 6.5 × 10^4 newtons/coulomb. the distance between a and b is 1.2 × 10^-2 meters and the path between a and b is parallel to the field. what is the magnitude of the difference in potential energy?

a. 1.2 × 10^-15 joules
b. 2.3 × 10^-15 joules
c. 3.2 × 10^-15 joules
d. 6.4 × 10^-15 joules
e. 6.4 × 10^-14 joules