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A parallel plate capacitor is charged and then the battery is disconnected, When the plates of the capacitor are brought closer, then This question has multiple correct options

1. energy stored in the capacitor decreases
2. the potential difference between the plates decreases
3. the capacitance increases
4. the electric field between the plates decreases

Correct answer: the capacitance increases

Solution

For a parallel-plate capacitor, capacitance is inversely proportional to plate separation, so bringing the plates closer increases capacitance. Since the battery is disconnected, the charge remains constant, which also means the potential difference and stored energy change accordingly.

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