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A capacitor is charged using a battery, which is then disconnected. A dielectric slab is then slipped between the plates, which results in

1. Reduction of charge on the plates and increase of potential difference across the plates
2. Increase in the potential difference across the plates, reduction in stored energy, but no change in the charge on the plates
3. Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates
4. None of the above

Correct answer: Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates

Solution

Once the battery is disconnected, the charge on the capacitor remains constant. Inserting a dielectric increases capacitance, so the potential difference decreases and the stored energy also decreases.

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