Answer :
The energy can be found as follows:
[tex]U=\frac{1}{2}CV^2[/tex]where:
C = Capacitance
V = Voltage
We can find the Capacitance using the following formula:
[tex]C=\frac{\epsilon_pA}{d}[/tex]Where:
[tex]\begin{gathered} \epsilon_p=Electric_{\text{ }}permittivity_{\text{ }}of_{\text{ }}polyethylene=2.25 \\ d=distance=7.686\times10^{-3}m \\ A=Area=0.0348m^2 \end{gathered}[/tex]So:
[tex]C=10.1876F[/tex]Therefore, the energy is:
[tex]\begin{gathered} E=\frac{1}{2}(10.1876)(25.045^2) \\ E\approx3195.1J \end{gathered}[/tex]