PRO(castination)

• Magnetic field


  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