(a) An a.c. source of voltage `V = V_0 sin omega t` is connected to a series combination
of L , C and R. Use the phasor diagram to obtain expressions for
impedance of the circuit and phase angle between voltage and current.
Find the condition when current will be in phase with the voltage.
What is the circuit in this condition called?
(b) In a series LR circuit `X_L = R` and power factor of the circuit is `P_1`. When
capacitor with capacitance C such that `X_L = X_C` is put in series the
power factor becomes `P_ 2` . Calculate `P_1/P_2` .