What is the phase difference between voltage across the inductance and a capacitor in an a.c. circuit?

Discuss the behaviour of a capacitor in a.c. circuit .

In a series LCR circuit the voltage across an inductor, a capacitor and a resistor are 20V, 20V and 40V respectively. What is the phase difference between the applied voltage and the current in the circuit?

In a series LCR circuit the voltage across an inductor, a capacitor and a resistor are 30V, 30V and 60V respectively. What is the phase difference between the applied voltage and current in the circuit?

Average power dissipated in pure capacitor in a.c. circuit is:

Phase difference between voltage and current in a.c. circuit having resistor only is: