1. R=25\ Ω , L=2.5 H, C=45\ μ F 2. R=15\ Ω , L=3.5 H, C=30\ μ F 3. R=25\ Ω , L=1.5 H, C=45\ μ F 4. R=20\ Ω , L=1.5 H, C=35\ μ F

Answer: 2. R=15\ Ω , L=3.5 H, C=30\ μ F Good tuning means a sharp resonance, i.e. a high quality factor Q=1/R√(L/C) . Option √(L/C) ( Ω ) Q 12369.4 234222.8 31837.3 420710.3 Option (2) has the largest Q (large L , small C , small R ), so it tunes best.

Topic: Reactance, impedance, LCR series circuit, resonance· Electromagnetic Induction and Alternating Currents

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1. \(R=25\ \Omega\), \(L=2.5\) H, \(C=45\ \mu\)F

2. \(R=15\ \Omega\), \(L=3.5\) H, \(C=30\ \mu\)F

3. \(R=25\ \Omega\), \(L=1.5\) H, \(C=45\ \mu\)F

4. \(R=20\ \Omega\), \(L=1.5\) H, \(C=35\ \mu\)F

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 2. \(R=15\ \Omega\), \(L=3.5\) H, \(C=30\ \mu\)F

Good tuning means a sharp resonance, i.e. a high quality factor \(Q=\dfrac1R\sqrt{\dfrac LC}\).

Option	\(\sqrt{L/C}\) (\(\Omega\))	\(Q\)
1	236	9.4
2	342	22.8
3	183	7.3
4	207	10.3

Option (2) has the largest \(Q\) (large \(L\), small \(C\), small \(R\)), so it tunes best.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

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