Measurements Show That It Takes $0.30 \mathrm {~mJ}$ Of Work to Move

Multiple Choice

Measurements show that it takes $0.30 \mathrm {~mJ}$ of work to move $5.0 - \mu \mathrm { C }$ of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kep constant. What is the potential difference between the plates of this capacitor?

A) $0 \mathrm {~V}$
B) $60 \mathrm {~V}$
C) $23 \mathrm {~V}$
D) $55 \mathrm {~V}$
E) $81 \mathrm {~V}$