Energy stored or energy density in terms of the field or the charge per area

1. A.
   $2\varepsilon_0 E A d$
2. B.
   $\frac{1}{2}\varepsilon_0 E^2 A d$
3. C.
   $\frac{\varepsilon_0 E^2}{2A d}$
4. D.
   $\frac{E^2 A d}{2\varepsilon_0}$

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1. A.
   $\frac{q^2}{2\varepsilon_0A^2}$
2. B.
   $\frac{q}{2\varepsilon_0 A^2}$
3. C.
   $\frac{q^2}{2\varepsilon_0A}$
4. D.
   $\frac{\varepsilon_0 A}{q^2}$

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1. A.
   $\dfrac{1}{2}\epsilon_0E^2$
2. B.
   $\dfrac{1}{2}A\epsilon_0E$
3. C.
   $\dfrac{1}{2}A\epsilon_0E^2d$
4. D.
   $\dfrac{1}{2}A\epsilon_0^2E \cdot d$

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