Practice portal › Electromagnetic Waves › E and B in the Wave
Asked in NEET 2002 · Direction from E cross B, and oblique propagation
The energy flow of an electromagnetic wave is given by the Poynting vector
⃗S=1/(μ₀)⃗E×⃗B, and the wave travels the way its energy goes.
So the velocity is parallel to ⃗E×⃗B.
Both fields are perpendicular to that direction, which is what makes the wave transverse.
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