Discussion
Assertion-Reason type questions :
Assertion (A) : Electromagnetic waves are transverse in nature.
Reason (R) : The electric and magnetic fields are perpendicular to the direction of wave propagation.
Answer: A
The answer is both (A) and (R) are true and (R) is the correct explanation of (A).
A wave is transverse when its oscillations are at right angles to the direction in which it travels. In an electromagnetic wave in free space, the electric field E and the magnetic field B are perpendicular to each other and both perpendicular to the direction of propagation, given by \(E \times B\).
That perpendicularity of the fields to the direction of propagation is exactly what makes the wave transverse, so the Reason explains the Assertion rather than merely being true alongside it.
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