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JEE Main202313 Apr 2023Morning ShiftPhysicsElectromagnetic InductionActual

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.

Options

  1. A(C) and (E) only
  2. B(D) only
  3. C(A) only
  4. D(B) and (D) only

Correct answer

B. (D) only

Step-by-step solution

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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