CBSE Class 12 · 2011 · EM WavesVery Short Answer

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A plane electromagnetic wave travels in vacuum along the y-direction. What can you say about the directions of the electric and magnetic field vectors?

Solution

Being transverse, the fields are perpendicular to the propagation direction y.
So

E

and

B

oscillate in the x--z plane; e.g.

E

along x and

B

along z, so that

E \times B

is along y.

E, B in the x-z plane, mutually perpendicular

CBSE Class 12 Board · 2011 · Subjective

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