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The distance between the two plates of a...

The distance between the two plates of a parallel plate air capacitor is 3mm, and the radius of earch plate is 9 cm. It is given a charge of `10^(-7)C` with a battery. Determine the energy stored in the capacitor. What will be the values of energy stored if a slab of dielectric constant 4 is introduced between the two plates
After removing the battery?

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`2.67xx10^(-4) J,1.67xx10^(-5) J`
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