1 \begin{problem*}{26.31}
2 A $12.0\U{V}$ battery is connected to a capacitor, resulting in
3 $54.0\U{$\mu$C}$ of charge stored on the capacitor. How much energy
4 is stored in the capacitor?
8 Just plug into the capacitor energy formula,
12 = \frac{1}{2} \cdot (54.0\E{-6}\U{C}) \cdot (12.0\U{V})
13 = \ans{324\U{$\mu$J}} \;.