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Match List-I with List-II (phasor diagrams). List-I: (A) Purely capacitive circuit, (B) Purely inductive circuit, (C) LCR series at resonance, (D) LCR series circuit. List-II: (I) current leads voltage by 90°, (II) current in phase with voltage, (III) current at angle θ to voltage, (IV) current lags voltage by 90°.

Asked in JEE Main 4th April 2nd Shift 2024 · Phase relationships and phasors

Answer: (2) A-I, B-IV, C-II, D-III

Step-by-step solution

Pure capacitor: current leads voltage by 90° ⇒ (I).

Pure inductor: current lags voltage by 90° ⇒ (IV).

LCR at resonance: X_L=X_C, current in phase with voltage ⇒ (II).

General LCR: current at angle θ=tan⁻¹(X_L-X_C)/R ⇒ (III).

Hence A-I, B-IV, C-II, D-III.

Why the other options are wrong

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