The potential energy of a charge q moving from a to b at point a is 5.4 × 10-10 joules and at point b is 2.3 × 10-10 joules. the charge is 2.5 × 10-15 coulombs. what potential difference does the particle undergo? a. 2.3 × 103 volts b. 2.5 × 104 volts c. 5.4 × 104 volts d. 7.0 × 104 volts e. 1.2 × 105 volts