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In an AC circuit, the current

1. Always leads the voltage
2. Always lags behind the voltage
3. Is always in phase with the voltage
4. May lead or lag behind or be in phase with the voltage

Correct answer: May lead or lag behind or be in phase with the voltage

Solution

In a purely resistive circuit, current and voltage are in phase. In an inductive circuit, current lags voltage, while in a capacitive circuit, current leads voltage. So all three possibilities are possible.

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