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The plates of a parallel plate capacitor...

The plates of a parallel plate capacitor have an area of `90 cm^2` each and are separated by 2.5 mm. The capacitor is charged by connecting it to a 400 V supply,
View this energy as stored in the electrostatic field between the fields, and obtain the energy per unit volume u .Hence ,arrive at a relation between u and the magnitude of electric field E between the plates .
Electrostatic energy = `2.22xx 10^-6` J

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