Q. A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in the capacitor is
A) (1/2)ε₀E²
B) E²Ad/ε₀
C) (1/2)ε₀E²Ad
D) ε₀EAd
Explanation
[Solution from source] Energy density between the plates is ½ε₀E² and the field occupies volume Ad, so U = ½ε₀E²Ad. The expression ½ε₀E² alone is energy per unit volume, not total energy. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.