Energy stored and energy density in the field of a parallel plate capacitor

1. A.
   $\frac{1}{2}\varepsilon_{0}E^{2}Ad$
2. B.
   $\frac{3}{4}\varepsilon_{0}E^{2}Ad$
3. C.
   $\frac{1}{4}\varepsilon_{0}E^{2}Ad$
4. D.
   $\varepsilon_{0}E^{2}Ad$

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1. A.
   $1.8 \times 10^{3}\text{ }J/m^{3}$
2. B.
   $2 \times 10^{- 4}\text{ }J/m^{3}$
3. C.
   $2 \times 10^{2}\text{ }J/m^{3}$
4. D.
   $1.8 \times 10^{5}\text{ }J/m^{3}$

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