Q. 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)
A) $\epsilon_0EAd$
B) $\frac{1}{2}\epsilon_0E^2Ad$
C) $\frac{E^2Ad}{\epsilon_0}$
D) $\frac{1}{2}\epsilon_0E^2$
Explanation
[Solution] Energy = energy density × volume $= \frac{1}{2}\epsilon_0E^2 \times Ad$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.