Question

What is the source of the energy carried by a propagating electromagnetic wave ​

Answer 1

Answer:

Electromagnetic waves are produced by accelerated or oscillating charges and do not need any medium for propagation. The source of energy of these waves are energy of oscillating charge particle.

Answer 2

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Electromagnetic waves are produced by accelerating charged particle. When the charge moves with acceleration, both the magnetic and electric fields change continuously. This change produces electromagnetic waves. Accelerated charge is the source of energy of these waves.