In the previous lesson, you have learned about the nature of an electromagnetic wave. You were also able to discover how accelerating electrons can produce electromagnetic waves and that these waves are a combination of electric and magnetic fields. In addition, you have also studied that EM waves transfer energy through a vacuum at the speed of 3x108 m/s which is the same as the speed of light. From what you have learned, what again is an electromagnetic wave?
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Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.
Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. They are hence known as ‘electromagnetic’ waves. The electric field and magnetic field of an electromagnetic wave are perpendicular (at right angles) to each other. They are also perpendicular to the direction of the EM wave.