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) $\dfrac{1}{2}\epsilon_0E^2Ad$
Concept. Energy density $\dfrac12\epsilon_0E^2$ over volume $Ad$.
Step 1. Energy. $U = \dfrac12\epsilon_0E^2Ad$.
Answer. $\dfrac12\epsilon_0E^2Ad$ (Option D).
Solution by Sreeraj P, M.Sc Physics