Question: A parallel-plate capacitor connected to a battery maintaining a potential difference (V) across the capacitor initially stores electric potential energy (U_{1}^{E}). If the plate area

A parallel-plate capacitor connected to a battery maintaining a potential difference $V$ across the capacitor initially stores electric potential energy $U_{1}^{E}$. If the plate area is doubled and the battery is replaced with one that maintains a potential difference of $2 \mathrm{~V}$ across the capacitor, how much electric potential energy is stored now?

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