Calculate the self inductance of the coil of 1000 turns in which current of 4A produces flux of 400 Maxwell.

Calculate the magnetic field due to a circular coil of 100 turns, radius 30 cm, carrying a current of 10 A, (i) at the centre and (ii) at a point 40 cm away from the centre on its axis.

Find the mutual inductance between the two coils if a current of 10 ampere in primary coil changes the flux by 500 Wb per turn in the secondary coil of 200 turns. Also, find the induced e.m.f. acorss the ends of the secondary coil if this change occurs in 0.5 sec.

Deduce an expression for the self inductance of a long solenoid, the core of which consists of a magnetic material of permiability mu_r

A coil has an inductance of .2 henry. Calculate the value of induced emf when the current in the coil is changing at the rate of 150 ampere per sec.