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) (D) only (b) (A) only (c) (B) and (D) only (d) (C) and (E) only

Answer: (a). (A) A permanent magnet gives a steady field, not time-varying. (B) E changing linearly gives a constant displacement current, hence a steady B. (C) Direct current gives a steady B. (D) A decelerating (accelerated) charge radiates, so its B varies with time. So the answer is (a) (D) only.

The source of time varying magnetic field may be (A) a permanent… | JEE Main 2023 (13 Apr, Shift 1)

Q8JEE Main 2023 · 13 APR · SHIFT 1Easy

Other: Induction & Displacement Current

The source of time varying magnetic field may be

(A) a permanent magnet

(B) an electric field changing linearly with time

(D) a decelerating charge particle

(E) an antenna fed with a digital signal

Choose the correct answer from the options given below:

Show answer and solution

Answer: (a)

(A) A permanent magnet gives a steady field, not time-varying.
(B) $E$ changing linearly gives a constant displacement current, hence a steady $B$ .
(C) Direct current gives a steady $B$ .
(D) A decelerating (accelerated) charge radiates, so its $B$ varies with time.
So the answer is (a) (D) only.

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