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Question 20194
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Electromagnetic Induction and Alternating Current: Phase Lag — Capacitor MCQ

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Phase Lag — CapacitorEasyQuestion 20194

Question

In a purely capacitive AC circuit, the current:
  1. A
    Lags voltage by 90°
  2. B
    Leads voltage by 90°
    Correct
  3. C
    Is in phase with voltage
  4. D
    Lags by 180°

Correct answer

Leads voltage by 90°

Explanation

For a capacitor, I = C dV/dt. If V = V₀ cosωt, then I = −CV₀ω sinωt = CV₀ω cos(ωt + 90°). Current leads voltage by 90°. Memory: ICE — in a capacitor (C), current (I) leads EMF (E).

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