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The plates of a paralllel plate capacito...

The plates of a paralllel plate capacitor have an area of `90 cm^(2)` each and are separated by 2.5mm. The capacitane is charged by connecting it to a 400V supply.
(a) How much electrostatic energy is stored by the capacitor ?
(b) View this energy as stored in the electrostatic field between the plates, and obtain the energy per unit volume (u). Hence arrive at a realtion between U and the magnitude of electric field E between the plates.

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