A parallel-plate vacuum capacitor has 636 j of energy, Physics

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A parallel-plate vacuum capacitor has 636 j of energy

A parallel-plate vacuum capacitor has 6.36 J of energy stored in it. The separation betweenthe plates is 2.20 mm. If the separation is decreased to1.85 mm,
Part A
what is the energy now stored if the capacitor was disconnected from the potential source before the separation of the plates was changed?

Part B
What is the energy now stored if the capacitor remained connected to the potential source while the separation of the plates was changed?

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