A coil of resistance `400 Omega` and inductance 0.5 H is connected across an alternating voltage of frequency 100 Hz. Calculate the phase difference between voltage and current in the circuit.

A pure inductor of inductance 300 mH is connected to ac source of emf 250 V and frequency 60 Hz. Calculate the rms current in the circuit?

A 12 Omega resistance and an inductance of 0.05/pi H are connected in a series: Across the ends of the circuit is connected a 130 V ac supply of 50 Hz. Calculate (i) The current in the circuit (ii) potential difference between the current and voltage.

Power factor of an ac circuit is 0.5. What is the phase difference between current and voltage?