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Question:
What makes a wave electromagnetic?



Replies:
A wave is, loosely speaking, transfer of energy without any transfer of matter. Generally wave propagation is associated with vibration or oscillation of some physical quantity about a mean : for example pressure in a sound wave. If electromagnetic field is the physical quantity which is oscillating, for simplicity consider this oscillation in absence of charges, then the wave is electromagnetic. Light, X-rays, ultraviolet radiation, radio waves are all electromagnetic waves with different wavelength.

Jasjeet



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