A parallel-plate capacitor initially has capacitance (C). The distance between the plates is then doubled, with a

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A parallel-plate capacitor initially has capacitance \(C\). The distance between the plates is then doubled, with a \(9.0-\mathrm{V}\) battery connected. The battery is then disconnected, and the plate area is doubled. Finally, a \(20-\mathrm{V}\) battery is connected across the plates. What is the new capacitance?

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