How electromagnetic waves are produced?

Accelerated charges radiate electromagnetic waves. An oscillating charge is an example of an accelerating charge. For example, consider a charge oscillating with some frequency. This produces an oscillating electric field in space, which creates an oscillating magnetic field, which in turn, is a source of the oscillating electric field, and so on. The oscillating electric and magnetic fields thus revive each other as the wave propagates through space. Usually, the frequency of the electromagnetic wave and the frequency of oscillation of the charge are equal.

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