The phase difference between voltage and current in an `LCR` series circuit is

The phase difference between voltage and current in series L-C circuit is

The phase difference between voltage and current in series L-C circuit is

The phase difference between the voltage and the current in an AC circuit is pi//4 . If the frequency is 50Hz then this phase difference will be equivalent to a time of

In a series RL circuit, the resitance and inductive reactane are the same. Then the phase difference between the voltage and current in the circuit is