Generated by moving charges and also by varying electric fields
Characteristics of EM waves
The electric and magnetic fields, E and B are always perpendicular to each other and also to the direction of propagation of the EM wave. EM waves are transverse waves
The cross product ExB gives the direction in which the EM wave travels. ExB also gives the energy carried by EM wave
The E and B fields vary sinusoidally and are in phase
EM waves are produced by accelerated electric charges
EM waves can travel through free space as well as through solids, liquids and gases
In free space, EM waves travel with velocity c, equal to that of light in free space
Velocity of EM waves in free space (c)
3x10^8 m/s
Permeability of free space (μ)
4π×10^-7 Tm/A
Permittivity of free space (ε)
8.85×10^-12 C^2/Nm^2
Velocity of EM waves in a material medium (Vm)
1/√(μm*εm)
Magnetic field is generated by moving charges and also by varying electric fields
The cross product ExB gives the direction in which the EM wave travels. ExB also gives the energy carried by EM wave
EM waves are produced by accelerated electric charges
EM waves can travel through free space as well as through solids, liquids and gases
In free space, EM waves travel with velocity c, equal to that of light in free space
The velocity (Vm) of EM waves in a given material medium is given by 1/√(μm*εm), where μm is the permeability and εm is the permittivity of the medium
