Answer
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.
Work Step by Step
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.