Electromagnetic wave in vacuum
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A detailed solution is then proposed.
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The electromagnetic wave in a vacuum is studied :
Is the corresponding wave plane ? Progressive ? Harmonic ? To justify.
What does it remind you of ?
Calculate the magnetic field.
Is there any dispersion ?
Determining the dispersion relation.
For this, we use the wave equation of the electric field in vacuum (d'Alembert's equation) :
We find :
There is dispersion with a phase velocity that is : (we assume )