Answer
$U_{max}=1.17\mu J$
Work Step by Step
We know that;
$U_{max}=\frac{Q^2}{2C}$
We plug in the known values to obtian:
$U_{max}=\frac{(2.90\times 10^{-6})^2}{2(3.60\times 10^{-6})}=1.1681\times 10^{-6}=1.17\mu J$
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