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  • An electromagnetic wave in vacuum has the electric and magnetic fields and <img alt="\vec{B}" src="https://

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 \vec{X} and that of wave propagation by \vec{k}.Then :

Option: 1

\vec{X}\parallel \vec{B}\: and\: \vec{k}\parallel \vec{B}\times \vec{E}


Option: 2

\vec{X}\parallel \vec{E}\: and\: \vec{k}\parallel \vec{E}\times \vec{B}


Option: 3

\vec{X}\parallel \vec{B}\: and\: \vec{k}\parallel \vec{E}\times \vec{B}


Option: 4

\vec{X}\parallel \vec{E}\: and\: \vec{k}\parallel \vec{B}\times \vec{E}


Answers (1)

best_answer

The direction of polarization is parallel to a magnetic field, \therefore \overrightarrow{\mathrm{X}} \| \overrightarrow{\mathrm{E}}

The direction of wave propagation is parallel to \overrightarrow{\mathrm{E}} \times \overrightarrow{\mathrm{B}}

\therefore \overrightarrow{\mathrm{k}} \| \overrightarrow{\mathrm{E}} \times \overrightarrow{\mathrm{B}}

Posted by

Sanket Gandhi

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