Question

Assertion The electromagnetic wave is transverse in nature.
Reason The wave propagates in straight line.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If Assertion is false but the Reason is true

Answer 1

Answer: (B)

The electromagnetic wave contains sinusoidally time varying electric and magnetic fields which act perpendicularly to each other as well as at right angle $\left(90^{\circ }\right)$ to the direction of propagation of waves, so it is quite clear that electromagnetic waves are transverse in nature. The two components of field may be represented as
$E=E_0\sin \omega \left(t-\frac{x}{v}\right)$
$B=B_0\sin \omega \left(t-\frac{x}{v}\right)$