An iron-core with 25 turns has an inductance of 0.625 mH. In order to obtain an inductance

of 0.1 mH, the number of turns will have to be changed to

The magnetic flux linked with a circuit of resistance 100 ohm increases from 10 to 60 webers. The amount of induced charge that flows in the circuit is (in coulomb)

An average emf of 20V is induced in an inductor when the current in it changed from 2.5A in one direction to the same value in opposite direction in 0.1s, the self inductance of inductor is

An inductor coil stores 32 J of magnetic field energy and it dissipates this energy as heat at the rate of 320 W when a current of 4 amperes is passed through it. Find the time constant of the circuit when this coil is formed across an ideal battery.

A circular coil of radius 1 cm with 100 turns is rotated at 60 cps in a magnetic field. The

e.m.f induced in the coil has maximum value 12.3 volt. Calculate the intensity of field.

The self induced e.m.f by a change of current from 5 to 10 amperes in 0.1 second is 10 volts.  Calculate the change in the energy of the magnetic field of the coil

A force of 10 N is required to move a conducting loop through a non uniform magnetic field at 2 m/s. The rate of production of electrical energy in watt in loop is

The time in which current increases to (1 –1/e) times the steady state current in an L-R circuit is

If a coil is removed from a magnetic field first rapidly and then slowly, work done will be

A car moves on a plane road. Induced emf across the axle is maximum when it moves