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Question

Out of the following options, which one can be used to produce a propagating electromagnetic wave?


A

A charge moving at constant velocity

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B

A stationary charge

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C

A chargeless particle

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D

An accelerating charges

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Solution

The correct option is D

An accelerating charges


The explanation of the correct answer.

In case of option D

  1. Electromagnetic waves are only generated when an electric charge accelerates or decelerates.
  2. Electromagnetic waves are produced when the charge's electric and magnetic fields change due to acceleration or deceleration.

The explanation of the incorrect answers.

In case of option A

A charge travelling at constant velocity cannot produce electromagnetic waves because the electric and magnetic fields of the constantly moving charge do not change.

In case of option B

A stationary charge cannot produce electromagnetic waves as its electric field stays constant while it is at rest.

In case of option C

A chargeless particle cannot form an electromagnetic wave because it lacks electric or magnetic field, and electromagnetic waves necessitate changes in electric and magnetic fields.

Hence, option D is the correct answer.


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