Class 12 Physics Electromagnetic Waves Electromagnetic Waves

Electromagnetic Waves


  • Electromagnetic waves are coupled time varying electric and magnetic fields that propagate in space.
  • Electric field is varying with time, and it will give rise to magnetic field, this magnetic field is varying with time and it gives rise to electric field and the process continues so on.
  • These electric and magnetic fields are time varying and coupled with each other when propagating together in space gives rise to electromagnetic waves.
  • In the fig, blue line represents the electric field and it varies in the form of a sine wave.
  • Themagnetic field as shown in the fig. represented by red line.
  • The magnetic field will be a sine wave but ina perpendicular direction to the electric field.
  • These both give rise to electromagnetic field.
  • If the electric field is along x-axis, magnetic field along y-axis, the wavewill then propagate in the z-axis.
  • Electric and magnetic field are perpendicular to each other and to the direction of wave propagation.
  • Electric and magnetic fields which is time varying and coupled to each other they give rise to electromagnetic waves.

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