Alternating CurrentHard

Question

In an electrical circuit R, L, C and an a.c 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, C is removed from the circuit, the phase difference is again π/3. The power factor of thecircuit is

Options

A.
B.
C.
D.1

Solution

Circuit is at resonance
xL = xC
⇒ cos φ = 1

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