An electromagnetic wave in vacuum has the electric and magnetic fields , which are always perpendicular to each other. The direction of polarization is given by and that of wave propagation by . Then :

Engineering

Physics

Electromagnetic Waves

Question

An electromagnetic wave in vacuum has the electric and magnetic fields $\vec{E} and \vec{B}$ , which are always perpendicular to each other. The direction of polarization is given by and $\vec{X}$ that of wave propagation by $\vec{k}$ . Then :

$\vec{X} | | \vec{E} and \vec{k} | | \vec{B} \times \vec{E}$

$\vec{X} | | \vec{B} and \vec{k} | | \vec{B} \times \vec{E}$

$\vec{X} | | \vec{E} and \vec{k} | | \vec{E} \times \vec{B}$

$\vec{X} | | \vec{B} and \vec{k} | | \vec{E} \times \vec{B}$

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The polarization direction X is parallel to the electric field E
The wave propagation direction k is parallel to E×B (the cross product of electric and magnetic fields)