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An LCR circuit connected in series is supplied with an alternating current source. When the circuit is in resonance, what phase difference exists between the voltage across the circuit and the current through it?
- π
- π/2
- π/4
- 0
Correct answer: 0
Solution
In a series LCR circuit at resonance X_L = X_C, so the net reactance is zero and the circuit is purely resistive. Hence the voltage and current are in phase and the phase difference is 0.
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