Alternating Current

In an electrical circuit \(R, L, C\) and \(\mathrm{AC}\) 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 \(\pi / 3\). If instead \(C\) is removed from the circuit, the phase difference is again \(\pi / 3\). The power factor of the circuit is