During the propagation of electromagnetic waves in a medium :

Options

A. (A)Electric energy density is equal to the magnetic energy density.
B. (B) Both electric and magnetic energy densities are zero.
C. (C) Electric energy density is double of the magnetic energy density.
D. (D) Electric energy density is half of the magnetic energy density.

Answer

A

Explanation

`rho_(E )=(1)/(2)in_(0)E_(rms)^(2)` and `rho_(B)=(1)/(2)(B_(rms))/(2))/(mu_(0))`
`therefore (rho_(E ))/(rho_(B))=in_(0)mu_(0)(E_(rms)^(2))/(B_(rms)^(2))`
`therefore (rho_(E ))/(rho_(B))=(1)/(c^(2))xx c^(2)" " [because in_(0) mu_(0)=(1)/(c^(2)), (E_(rms))/(B_(rms))=c]`
= 1
`therefore rho_(E )=rho_(B)`