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A parallel plate capacitor having capacitance 12 pF is charged by a battery to a potential difference of 10 V between its plates. The charging battery is now disconnected and a porcelain slab of dielectric constant 6.5 is slipped between the plates. The work done by the capacitor on the slab is :

1. 508 pJ
2. 692 pJ
3. 560 pJ
4. 600 pJ

Correct answer: 508 pJ

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