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  3. a parallel-plate vacuum capacitor has 8.22 jj of e

A parallel-plate vacuum capacitor has 8.22 JJ of energy stored in it. The separation between the...

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Electrical Engineering

A parallel-plate vacuum capacitor has 8.22 JJ of energy storedin it. The separation between the plates is 3.50 mmmm.

Part A

If the separation is decreased to 1.80 mmmm, what is the energynow stored if the capacitor was disconnected from the potentialsource before the separation of the plates was changed?

Express your answer in joules.

U = ?? J

Part B

If the separation is decreased to 1.80 mmmm, what is the energynow stored if the capacitor remained connected to the potentialsource while the separation of the plates was changed?

Express your answer in joules.

U = ?? J

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