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The plates of a parallel plate capacitor have an area of 90cm² each and are separated by 2 mm. The capacitor is charged by connecting if to a 400 V supply. Then the density of the energy stored in the capacitor
$(ε_{o} = 8 .8 \times 10^{- 12} F / m)$

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0.113Jm^-3

0.177 Jm^-3

0.152 Jm^-3

0.226 Jm^-3

answer is B.

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Detailed Solution

$U = \frac{1}{2} ε_{0} E^{2}, E = \frac{V}{d}$

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