A parallel$-$plate vacuum capacitor has $7\mathrm{.}64$ J of energy stored in it$.$ The separation between the plates is $2\mathrm{.}30$ mm$.$ If the separation is decreased to $1\mathrm{.}30$ mm$,$ a$)$ what is the energy now stored if the capacitor was disconnected from the potential source before the separation of the plates was changed? b$)$ What is the energy now stored if the capacitor remained connected to the potential source while the separation of the plates was changed? A parallel$-$plate vacuum capacitor has $6\mathrm{.}60$ J of energy stored in it$.$ The separation between the plates is $2\mathrm{.}50$ mm $.$

Part A

If the separation is decreased to $1\mathrm{.}40$ mm $,$ what is the energy now stored if the capacitor was disconnected from the potential source before the separation of the plates was changed?

Express your answer in joules.

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Part B

If the separation is decreased to $1\mathrm{.}40$ mm $,$ what is the energy now stored if the capacitor remained connected to the potential source while the separation of the plates was changed?

Express your answer in joules.