Q 12-02-012NEETNEET 2021Top questionEasy
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 : ($\epsilon_0$ = permittivity of free space)
Answer: (D) $\dfrac{1}{2}\epsilon_0E^2Ad$
Energy density in an electric field: $u = \dfrac{1}{2}\epsilon_0E^2$.
The field fills the volume $Ad$ between the plates:
$$U = \frac{1}{2}\epsilon_0E^2 \times Ad$$
Solution by Sreeraj P, M.Sc Physics