An ideal solenoid of cross-sectional area `10^(-4)m^(2)` has 500 turns per metre. At the centre of this solenoid, another coil of 100 turns is wrapped closely around it. If the current in the coil changes from 0 to 2 A in 3.14 ms, the emf developed in the second coil is

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.

(a) A toroidal solenoid with an air core has an average radius of 0.15m, area of cross section 12 xx 10^(-4) m^(2) and 1200 turns. Obtain the self inductance of the toroid. Ignore field variation across the cross section of the toroid. (b) 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 emf in the secondary coil.

A toroidal solenoid with an air core has an average radius of 15 cm, area of cross-section 12 cm^(2) and 1200 turns. Obtain the self inductance of the toroid. Ignore field variations across the cross-section of the toroid. (b) 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.

A long solenoid of diameter 0.1 m has 2 xx 10^(4) turns per metre. At the centre of the solenoid, a 100- turns coil of radius 0.01 m is placed with its axis coinciding with the constant rate from + 2 A to 2 A in 0.05 s . Find the total charge (in mu C ) flowing through the coil during this time when the resistance of the coil is 40 !=^(2) Omega .

A long solenoid of diameter 0.1 m has 2 xx 10^(4) turns per metre. At the centre of the solenoid, a 100- turns coil of radius 0.01 m is placed with its axis coinciding with the constant rate from + 2 A to 2 A in 0.05 s . Find the total charge (in mu C ) flowing through the coil during this time when the resistance of the coil is 40 !=^(2) Omega .

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