Question

The oscillating electric and magnetic field vectors of an electromagnetic wave are along

• A. the same direction and in same phase.
• B. the same direction but have a phase difference of 90$^{\circ}$.
• C. mutually perpendicular directions and are in same phase.
• D. mutually perpendicular directions but have a phase difference of 90$^{\circ}$.

Hint:

E and B fields in EM waves: Perpendicular to each other and to direction of propagation, and in phase.

Answer 1

The Correct Option is C

In an electromagnetic wave, the electric and magnetic field vectors are always perpendicular to each other and to the direction of propagation of the wave. They are also in phase, meaning they reach their maximum and minimum values at the same time.