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Energy Stored & Force between Plates question from NEET 2021

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Energy Stored & Force between Plates

A parallel plate capacitor has a uniform electric field $\vec{E}$ in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is: ( $\varepsilon$ 0 = permittivity of free space)

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Answer: (d)

Energy density $u = \frac{1}{2}\varepsilon_0 E^2$ .
Volume between plates $= Ad$ , so $U = \frac{1}{2}\varepsilon_0 E^2 Ad$ .
So the answer is (d) $\frac{1}{2}\varepsilon_0 E^2 Ad$ .

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