An air-cored solenoid is of length 0.3 m area of cross-section `1.2 xx 10^-3m^2` and has 2500 turns. Around tis central section, a coil of 350 turns is wound. The soelnoid and the coil are electrically insulated from each other. Calculate the e.m.f. induced in the coil , if the intial current of 3 A in the solenoid is reversed in 0.25 s.

A solenoid has 2,000 turns wound over a length of 0.3 m. The area of its cross-section is 2 xx 10^-3 m^2 . A round its central part, a coil of 300 turns is wound. If an initial current of 2 A is reversed in 0.25 s, the induced e.m.f. produced in the coil is:

A solenoid has 2,000 turns wound over a length of 0.3m. the area of its cross-section is 1.2 xx 10^-3 m^2 . Around its central part, coil of 300 is wound. If a initial current of 2A is reversed in 0.25 s, the induced e.m.f. produced in the coil is

A solenoidal coil has 50 turns er cm along its length and a cross-sectional area of 4 cm^2 . 200 truns of another wire is wound round the first solenoid coaxially. The two coils are electrically insulated from each other. Calculate the mutual inductance between the two coils. given that mu_0 = 4 pi xx 10^-7 N A^-2

A long solenoid of length 1 m, cross sectional area 10 cm^2 , having 1000 turns has wound about its centre a small coil of 20 turns. Compute the mutual inductance of the two circuits. What is e.m.f. in the coil when the current in the solenoid chanages at the rate of 10 As^-1 ?

A closely wound solenoid of 2000 turns and area of cross-section 1.6 xx 10^1 m^2 . carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane. What is the magnetic moment associated with the solenoid?

In a coil of self-induction 5 H, the rate of change of current is 2 A s^-1 . Then, e.m.f. induced in the coil is

A coil has an inductance of 1.5 xx 10^-2 H. Calculate the e.m.f. induced, when current in the coil changes at the rate 200 ampere per second.

A second coil of 300 turns is wound closely on the toroid above. If the current in the primary coil is increased from zero to 2.0 A in 0.05 s, obtain the induced e.m.f. in the second coil.

An air-cored solenoid with length 30 cm, area of cross-section 25 cm^2 and number of turns 500, carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10^-3s . How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in magnetic field near the ends of the solenoid.