Properties of EM Waves: Practice Problem & Solution

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Properties of EM Waves. Understanding the underlying formula is key to arriving at the correct answer below:

The direction of propagation of an electromagnetic wave, and thus its velocity vector, is given by the direction of the Poynting vector $\bar{S} = \frac{1}{\mu_0} (\bar{E} \times \bar{B})$ . Hence, it is parallel to $\bar{E} \times \bar{B}$ .