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A parallel plate capacitor of capacitance Co has plates of area A with separation d between...

A parallel plate capacitor of capacitance Co has plates of area A with separation d between them. When it is connected to a battery of voltage Vo, it has charge of magnitude Qo on its plates. It is then disconnected from the battery and the plates are pulled apart to a separation 2d without discharging them. After the plates are 2d apart, by what factor does the capacitance change? By what factor does the potential difference between the plates change?

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Answer #1

the new capacitance is half as before.

And potential difference is doubled.

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