Inductor

The reactance of a circuit is zero It is possible that the circuit contains (i) an inductor and a capacitor (ii) an inductor but no capacitor (iii) a capacitor but no inductor (iv) neither an inductor nor a capacitor .

The current through an inductor of impedance 10Omega lags behind the voltage by a phase of 60^(@) when just the inductor is connected to the ac source. Now the inductor is connected to a 5Omega resistance in series, then the net impedance of the circuit is