The source of time varying magnetic field may be

Physics Electromagnetic Induction JEE Main 2023 MCQ (Single Correct)

a permanent magnet only

an electric field changing linearly with time and

direct current and (E) only

a decelerating charge particle (E) an antenna fed with a digital signal Choose the correct answer from the options given below. only only

Text Solution

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The correct answer is:

An electric field varying linearly with time will not produce variable magnetic field as current will be constant.

A decelerating charged particle can result in a time varying magnetic field by emitting radiation.

Similarly, a permanent magnet has a constant magnetic field and a direct current does not change its direction and cannot produce a magnetic field.

An antenna can modulate the digital signals.

So, the right option is the statement D.

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