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A parallel plate capacitor with square plates 14cm on a side and separated by 2.0 mm...

A parallel plate capacitor with square plates 14cm on a side and separated by 2.0 mm is connected to a batter and charged to 12v. (a) What is the charge on the capacitor? (b) How much energy is stored in the capacitor? The batter is then disconnected from the capacitor and the plate separation is then increase to 3.5 mm. By how much is the enrgy increased when the plate separation is changed?

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Thia problem is based on capacitor as explained below...

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