The inherent characteristic of electromagnetic waves is its frequency. According to Maxwell, varying the electric field gives rise to a magnetic field. An accelerated charge produces a time-varying magnetic field which in turn produces a time-varying electric field. Thus, an electromagnetic wave consists of sinusoidal time-varying electric and magnetic fields, and both the fields are perpendicular to each other.
You may also want to check out these topics given below!
- Transverse Nature of Electromagnetic Waves
- Electromagnetic Radiation
- Propagation Of Electromagnetic Waves
What are the Characteristics of Electromagnetic Waves?
Listed below are some important characteristics and properties of electromagnetic waves.
- Electromagnetic waves are transverse in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other.
- Accelerated charges are responsible to produce electromagnetic waves.
- Electromagnetic waves have constant velocity in vacuum and it is nearly equal to \(3 × 10^8 m s^{-1}\) which is denoted by \(C\) = \(\frac{1}{√{μ_o ϵ_o}}\).
- Electromagnetic wave propagation does not require any material medium to travel.
- The inherent characteristic of an electromagnetic wave is its frequency. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another.
- The refractive index of a material is given by:\(n\) = \(√{μ_r ϵ_r}\)
- Electromagnetic wave follows the principle of superposition.
- The light vector (also known as the electric vector) is the reason for the optical effects due to an electromagnetic wave.
- In an electromagnetic wave, the oscillating electric and magnetic fields are in the same phase and their magnitudes have a constant ratio. The ratio of the amplitudes of electric and magnetic fields is equal to the velocity of the electromagnetic wave.\(C\) = \(\frac{E_0}{B_0} \)
- The energy is carried by the electric and magnetic fields of electromagnetic waves are equal, i.e. the electric energy (\(u_E\)) and the magnetic energy (\(u_M\)) are equal; \(u_E\) = \(u_M\).
- There is a vector quantity \(S\), called the Poynting vector which represents the energy transferred by electromagnetic waves per second per unit area.
