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Question

An electromagnetic wave has


A

Electric vector only

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B

Magnetic vector only

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C

Electric and magnetic vectors perpendicular to each other

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D

Neither the electric vector nor the magnetic vector

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Solution

The correct option is C

Electric and magnetic vectors perpendicular to each other


The explanation for the correct answer:

(C) Electric and magnetic vectors perpendicular to each other.

In an electromagnetic wave, the time-varying electric and magnetic fields are mutually perpendicular to each other and also perpendicular to the direction of the propagation of this wave.

The explanation for the incorrect answer:

(A) Electric vector only

Light is an electromagnetic wave. Electric and magnetic fields oscillate at some characteristic frequency while traveling at the speed of light. These fields have a magnitude, phase, and direction.

(B)Magnetic vector only

In classical electromagnetism, magnetic vector potential (often called A) is the vector quantity defined so that its curl is equal to the magnetic field. Together with the electric potential φ, the magnetic vector potential can be used to specify the electric fieldE as well

(D) Neither the electric vector nor the magnetic vector

Electric and magnetic vectors are perpendicular to each other.

Hence, option (c) is correct.


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