Two identical parallel-plate capacitors, each with capacitance 19.0 ?F, are charged to potential difference 55.0 V and then disconnected from the battery. They are then connected to each other in parallel with plates of like sign connected. Finally, the plate separation in one of the capacitors is doubled. (a) Find the total energy of the system of two capacitors before the plate separation is doubled. (b) Find the potential difference across each capacitor after the plate separation is doubled. (c) Find the total energy of the system after the plate separation is doubled. (d) Reconcile the difference in the answers to parts (a) and (c) with the law of conservation of energy. Positive, negative or no work?

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Combination of Capacitors

The connection of capacitors can be established in a circuit in two ways.