Em Waves Question 143
Question: During the propagation of electromagnetic waves in a medium
Options:
A) electric energy density is double of the magnetic energy density.
B) electric energy density is half of the magnetic energy density.
C) electric energy density is equal to the magnetic energy density
D) both electric and magnetic energy densities are zero.
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ E _{0}=CB _{0} $ and $ C=\frac{1}{\sqrt{{\mu _{0}}{\varepsilon _{0}}}} $ Electric energy density $ =\frac{1}{2}{\varepsilon _{0}}E _{0}^{2}={\mu _{E}} $ Magnetic energy density $ =\frac{1}{2}\frac{Bo^{2}}{{\mu _{0}}}={\mu _{B}} $ Thus, $ {\mu _{E}}={\mu _{B}} $ Energy is equally divided between electric and magnetic field
BETA
