A parallel$-$plate vacuum capacitor has $6\mathrm{.}20$ JJ of energy stored in it$.$ The separation between the plates is $2\mathrm{.}90$ mmmm$.$

Part A

If the separation is decreased to $1\mathrm{.}75$ mmmm$,$ 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.

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

UU $=$

nothing

JJ

SubmitRequest$$Answer

Part B

If the separation is decreased to $1\mathrm{.}75$ mmmm$,$ what is the energy now stored if the capacitor remained connected to the potential source while the separation of the plates was changed?