Q. The average value of electric energy density in an Electromagnetic Waves is (E$_{0}$ is peak value)
A) $\frac{1}{2}\varepsilon_{0}E_{0}^{2}$
B) $\frac{E_{0}^{2}}{2\varepsilon_{0}}$
C) $\varepsilon_{0}E_{0}^{2}$
D) $\frac{1}{4}\varepsilon_{0}E_{0}^{2}$
Explanation
(d) Electric energy density
$\ \ \ \ \ u_{e}\ = \ \frac{1}{2}\varepsilon_{0}E_{rms}^{2}$
$\ E_{rms}\ = \ \frac{E_{0}}{\sqrt{2}}$
$\ \ \ \ \ u_{e}\ = \ \frac{1}{4}\varepsilon_{0}E_{0}^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.