What is the potential energy of the system?
1.2×10−2 J1.2 \times 10^{-2}\text{ J}1.2×10−2 J
1.2×10−2 J C−11.2 \times 10^{-2}\text{ J C}^{-1}1.2×10−2 J C−1
7.5×10−8 J7.5 \times 10^{-8}\text{ J}7.5×10−8 J
7.5×10−8 J C−17.5 \times 10^{-8}\text{ J C}^{-1}7.5×10−8 J C−1
