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Separation between plates of a parallel plate capacitors is 'd'. It is charged a battery then disconnected ,a dielectric slab of thickness $\large\frac{d}{3}$ and constant 3 is introduced in it . The fractional change in energy .

$\begin{array}{1 1} \large\frac{-2}{9} \\ \large\frac{+2}{9} \\\large\frac{-4}{9} \\ \large\frac{4}{9} \end{array} $

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