In an electromagnetic wave, the oscillating electric and magnetic field vectors are oriented along
In an electromagnetic wave, the electric field \(\vec{E}\), magnetic field \(\vec{B}\), and direction of wave propagation are mutually perpendicular to each other.
Consider the following statements for EM wave travelling in free space:
a. They are longitudinal in nature.
b. EM waves of different frequency have different speed in vacuum.
c. The average energy density associated with electric field is equal to energy density associated with magnetic field.
The correct statement(s) is/are
Electromagnetic waves are transverse in nature, and all EM waves travel with the same speed in a vacuum. The average electric energy density is equal to the average magnetic energy density, so only statement c is correct.
Which of the following conclusion can be drawn if an electromagnetic wave satisfies the Ampere’s law for vacuum?
For an EM wave in vacuum, \(c = \frac{E_0}{B_0}\) and \(c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}}\). Substituting \(\frac{B_0}{E_0} = \frac{1}{c}\) into \(mu_0 \varepsilon_0 = \frac{B_0}{E_0 c}\) gives \(mu_0 \varepsilon_0 = \frac{1}{c^2}\), which is true.