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A parallel plate capacitor has capacitan...

A parallel plate capacitor has capacitance C. If the charges of the plates are `Q` and `-3Q`, find of the

i. charges at the inner surfaces of the plates
ii. Potential difference between the plates
iii. charge flown if the plates are connected
iv. energy lost by the capacitor in (iii.)
v. charge flown if any plate is earthed.

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