Doubling the capacitance of a capacitor that is holding a constant charge causes the energy stored in that capacitor to

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Quizplus · Accepted Answer

The energy stored in a capacitor is given by E=1/2CV^2, where C is the capacitance and V is the voltage across the capacitor. Since the charge on the capacitor remains constant, doubling the capacitance means that the voltage across the capacitor will halve (as Q=CV, where Q is the charge). Thus, the energy stored in the capacitor will decrease to half of its original value (since V^2 is halved).

Doubling the Capacitance of a Capacitor That Is Holding a Constant