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JEE Main 2021 (24 Feb, Shift 2) · Combination of Inductors, LR & LC Circuits

Combination of Inductors, LR & LC Circuits question from JEE Main 2021 (24 Feb, Shift 2)

Q27JEE Main 2021 · 24 FEB · SHIFT 2Medium

Combination of Inductors, LR & LC Circuits

Figure shows a circuit that contains four identical resistors with resistance R = 2.0Ω\Omega, two identical inductors with inductance L = 2.0 mH and an ideal battery with emf E = 9V. The current 'i' just after the switch 'S' is closed will be:

Figure

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Answer: (d)

  1. Just after closing SS, both inductor branches carry no current (inductors act as open circuits).
  2. Current flows only through the series RR and the single RR branch: total 2R=4 Ω2R = 4\,\Omega.
  3. i=94=2.25 Ai = \frac{9}{4} = 2.25\text{ A}
  4. So the answer is (d).
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