$A$ parallel plate air capacitor has a uniform electric field $E$ in the space between the plates. The area of each plate is $A$ and the distance between the plates is $d$. The energy stored in the capacitor is $[\varepsilon_0 = \text{permittivity of free space}]$
- A$2 \varepsilon_0 E A d$
- B$\frac{\varepsilon_0 E^2}{2 A d}$
- C$\frac{1}{2} \varepsilon_0 E^2 A d$
- D$\frac{E^2 A d}{2 \varepsilon_0}$
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