Electromagnetic Waves - Result Question 18

18. The oscillating electric and magnetic field vectors of electromagnetic wave are oriented along

(a) the same direction and in phase

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(b) the same direction but have a phase difference of $90^{\circ}$

(c) mutually perpendicular directions and are in phase

(d) mutually perpendicular directions but has a phase difference of $90^{\circ}$

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Answer:

Correct Answer: 18. (c)

Solution:

  1. (c) The direction of oscillations of $E$ and $B$ fields are perpendicular to each other as well as to the direction of propagation. So, electromagnetic waves are transverse in nature.

The electric and magnetic fields oscillate in same phase.