Power Factor

In an electrical circuit and an AC voltage source are all connected in series. When is removed from the circuit, the phase difference between the voltage and the current in the circuit is . If instead, is removed from the circuit, the phase difference is again . The power factor of the circuit is:

The potential differences across the resistance, capacitance, and inductance are , and respectively in an circuit. The power factor of this circuit is:
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An inductor of , a capacitor of , and a resistor of are connected in series across a source of emf, . What is the power loss in this circuit?
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