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 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 the circuit is:
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When
is removed, the phase difference between the voltage and current is




When C is removed, the phase difference between the voltage and current is


As
,
the series
circuit is in resonance.
Impedance of the circuit,

Power factor, 
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