Answer
$0.975J$
Work Step by Step
We can find the required done in charging the capacitor as follows:
$W=U=\frac{1}{2}QV$
We plug in the known values to obtain:
$W=\frac{1}{2}(3.75\times 10^{16}\times 1.6\times 10^{-19}C)(325V)$
$W=0.975J$
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