A parallel plate capacitor having capacitance 12 P \( \mathrm{pF} \) is charged by a battery to ...

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A parallel plate capacitor having capacitance 12
P \( \mathrm{pF} \) is charged by a battery to a potential difference

W of \( 10 \mathrm{~V} \) 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 :
(A) \( 692 \mathrm{pJ} \)
(B) \( 560 \mathrm{pJ} \)
(C) \( 508 \mathrm{pJ} \)
(D) \( 600 \mathrm{pJ} \)
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