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A parallel plate capacitor of $6 \mu \mathrm{F}$ is connected across 18 V battery and charged. The battery is then disconnected and oil of dielectric constant $\mathrm{k}=2.1$ is introduced between the plates. What will be the charge on capacitor? 

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Important Questions on Electrostatics

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The capacity of a parallel plate condenser is 12 μF. Its capacity, when the separation between plates is doubled and area is halved will be

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