Chapter 16 - Electric Potential, Energy, and Capacitance - Learning Path Questions and Exercises - Conceptual Questions - Page 591: 15

The electrostatic potential energy stored in the system is $U_{c}=\frac{Q^{2}}{2C}$, with $C=\frac{epsilon}{Ad}$ With Q fixed, if d increases, C decreases and hence $U_{c}$ increases.

The electrostatic potential energy stored in the system is $U_{c}=\frac{Q^{2}}{2C}$, with $C=\frac{epsilon}{Ad}$ With Q fixed, if d increases, C decreases and hence $U_{c}$ increases.