# Final potential difference between plates of capacitor [closed]

If the plates of a parallel plate capacitor are given charges 4Q and -2Q . The capacitor is then connected across an uncharged capacitor of the same capacitance as first one (=C) . Now we have to find the final potential difference between the plates of first capacitor .

I tried it and done the charge distribution but not able to proceed .

## closed as off-topic by user36790, John Rennie, CuriousOne, ACuriousMind♦, AccidentalFourierTransformMay 29 '16 at 11:17

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You have obviously correctly decided on how the charges ($4Q$ and $-2Q$) are distributed on the original capacitor.