Question

A capacitor is completely charged with 570 nC by a voltage source that had 200 V.

What is its capacitance?

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Now the plates of the charged capacitor are pushed together with the voltage source already disconnected.
a. The energy stored in the capacitor remains the same.
b. The capacitance increases.
c. The energy stored in the capacitor increases.
d. The charge on the plates increases.
e. None of the above.

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The initial air gap of the capacitor above was 8 mm. What is the stored energy if the air gap is now 5 mm?

Answer 1