A 100 Hz a.c. is flowing in a 14 millihenry coil. Find the reactance of the coil.

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an a.c. source of 200 V, 100 hz is connected across the coil, the current in the coil? Find the current of the coil

Current changes from 5A to OA in 1 second in a coil of self inductance 1H. Find the induced emf in the coil.

Current changes from 10A to 0A in 2 seconds in a coil of self inductance 2H. Find the induced emf in the coil.

Current changes from 12A to 7A in 2 seconds in a coil of self inductance 2H. Find the induced emf in the coil.

An electric device, which runs at 80 volt d.c. and consumes 10 A current , is connected to 100 vol-50 Hz a.c. supply through a choke. Calculate the inducance of the choke coil for the safe working of the device.

An a.c. generator consists of a coil of 100 turns and cross sectional area of 3 m^(2) , rotating at a constant angular speed of 60 rad//sec in a uniform magnetic field of 0.04 T. The resistance of the coil is 500 Omega . Calculate max. power dissipation in the coil.

An a.c. generator consists of a coil of 100 turns and cross sectional area of 3 m^(2) , rotating at a constant angular speed of 60 rad//sec in a uniform magnetic field of 0.04 T. The resistance of the coil is 500 Omega . Calculate maximum current drawn from the generator.

A n a.c. circuit that contians an inductance and a resistance has an impedance of 50 ohm at 100 Hz and an impedance of 100 ohm at 500 Hz. What are the values of inductance and the resistance of the circuit?