QUESTIONS
Under what circumstances does a charge radiates
electromagnetic waves ?
In an electromagnetic wave, what is the relation-
ship, I any, between the variations in the electric
and magnetic fields?
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Answer:
In classical electromagnetism, any accelerated charge should radiate. The back reaction on the charge due to radiation is given by radiation reaction which depends on time derivative of acceleration. However for uniformly accelerated charge there is radiation but no radiation reaction.
Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.
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