$23.(1)$ How much energy is stored by the electric field between two square plates, $8\mathrm{.}0$ cm on a side, separated by a $1\mathrm{.}5$ mm air gap? The charges on the plates are equal and opposite and of magnitude $\backslash (420\backslash$mu $\backslash$mathrm$\{$C$\}\backslash ).(2)$ The magnetic field inside an air$-$filled solenoid $32\mathrm{.}0$ cm long and $2\mathrm{.}10$ cm in diameter is $0\mathrm{.}600$ T $.$ Approximately how much energy is stored in this field?