Question
In an electrical circuit R, L, C and AC voltage source are all connected in series when L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead, Cis removed from the circuit, the phase difference is again π/3. The power factor of the circuit is
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1/2
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-
1
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Solution
C.
1
Here, phase difference
It is a condition of resonance, therefore, phase difference between voltage and current is zero and power factor is cos Φ = 1.
