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  9. Q354

RRB Group D (Level-1 posts) 2022 · Question 354 of 598

A magnet, when moved near a coil, produces an induced current. Which of the following method(s) can be used to increase the magnitude of the induced current? (i) Increasing the number of turns in the coil (ii) Increasing the speed of the magnet (iii) Increasing the resistivity of the wire of the coil

  1. AOnly (i)
  2. BOnly (iii)
  3. CBoth (ii) and (iii)
  4. DBoth (i) and (ii)Correct

Answer: D. Both (i) and (ii)

Explanation

According to Faraday’s Law of Induction, increasing the number of turns in the coil or the speed of the magnet increases the induced current. Increasing resistivity would reduce current, so options (i) and (ii) are correct.

Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary

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