Problem 4.146

A capacitor with capacitance $C$ and a coil with active resistance $R$ and inductance $L$ are connected in parallel to a source of sinusoidal voltage of frequency $\omega .$ Find the phase difference between the current fed to the circuit and the source voltage.

\tan \varphi=\frac{\omega C\left(R^{2}+\omega^{2} L^{2}\right)-\omega L}{R}

Electric Oscillations