A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is π/3. If instead C is removed from the circuit, the phase difference is again π/3 between current and voltage. The power factor of the circuit is :
(1) –1.0
(2) zero
(3) 0.5
(4) 1.0
(1) –1.0
(2) zero
(3) 0.5
(4) 1.0