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JEE PHYSICS MCQ: COMMUNICATION SYSTEMS
1
Medium
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Understanding
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The source of time varying magnetic field may be
(A) a permanent magnet
(B) an electric field changing linearly with time
(C) direct current
(D) a decelerating charge particle
(E) an antenna fed with a digital signal
Choose the correct answer from the options given below.
(A) a permanent magnet
(B) an electric field changing linearly with time
(C) direct current
(D) a decelerating charge particle
(E) an antenna fed with a digital signal
Choose the correct answer from the options given below.
View answer and explanation
Correct option: B
(D) only
Option D ((B) and (D) only) is correct because a time-varying magnetic field can be produced by a changing electric field or an accelerating (or decelerating) charge.
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