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1999
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Q)
A parallel plate capacitor filled with a dielectric of relative permitivity 5 between its plates is charged to acquire an energy $E$ and isolated. If the dielectric is replaced by another of relative permitivity 2, its energy becomes:
( A ) $6.25\;E$
( B ) $0.4\;E$
( C ) $2.5\;E$
( D ) $E$
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