How Does Changing the Air Gap Affect the Energy Stored in a Capacitor?

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SUMMARY

The discussion focuses on the impact of changing the air gap on the energy stored in a capacitor. Initially, a capacitor charged to 650 nC at a voltage of 375 V has an air gap of 7 mm. When the air gap is increased to 11 mm, the energy stored in the capacitor decreases due to the increased distance affecting the capacitance. The voltage source must remain connected to maintain the charge during this adjustment.

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A capacitor is completely charged with 650 nC by a voltage source that had 375 V.

The initial air gap of the capacitor above was 7 mm. What is the stored energy if the air gap is now 11 mm?
 
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Has the voltage source been disconnected before increasing the distance?
 

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