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A parallel-plate capacitor has an initial charge q and a plate separation distance d . a) How much work must you do, in terms of

A parallel-plate capacitor has an initial charge q and a plate separation distance d .

a) How much work must you do, in terms of q , d , and plate area A , to increase the separation distance to 3 d if the capacitor is isolated?

b) How much work must you do, in terms of q , d , and plate area A , to increase the separation distance to 3 d if the capacitor is connected to a battery?

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