Question: Q. 4. If E and B represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along (a) E. (c) B×E. (b) B.

(d) E×B.

[NCERT Exemplar]

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Solution:

Ans. Correct option : (d)

Explanation: The direction of propagation of electromagnetic wave is perpendicular to E and B both and by right thumb rule.

The direction of propagation of electromagnetic wave is perpendicular to both the electric field vector E and B magnetic field vector B, i.e., in the direction of E×B.

Here, electromagnetic wave is along the z-direction which is given by the cross product of E and B.



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