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26. 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) 692 pJ
(2) 60 pJ
(3) 508 PJ
(4) 560 pJ


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