Question 14.1: Two Identical Coils A and B of 500 turns each has on parallel planed such that 70% of flux produced by one coil links with the other. A current of 6A flowing in coil A produces a flux of 0.06m Wb in it. If the current in coil A changes from 10A to …

Question 14.2: A Wheel with 12 metal spokes each 0.6m long is rotated with a speed of 180 r.p.m in a plane normal to earth’s magnetic field at a place. If the magnitude of the field is 0.6 G, what is the magnitude of induced e.m.f. between the axle and rime of the wheel?

Question 14.3: A circuit has 1000 turns enclosing a magnetic circuit 20cm^2 in section with 4A current, the flux density is 1 Wbm^-2 and with 9A current, it is 1.4Wbm^-2. Find the mean value of the inductance between these current limits and the induced e.m.f. If the current falls from 9A to 4A in 0.5s.

Question 14.4: A coil of resistance 100 Ω is placed in a magnetic filed of 1mWb. The coil has 100 Ω turns and a galvanometer of 400 resistance is connected in series with it: find the average emf and the cuurrent if the coil is moved in 1/10th s from the given field to a …

Question 14.5: A horizontal straight wire 10m long extending from east to west is falling with a speed of 5.0m/s, at right angles to the horizontal component of the earth’s magnetic field, 0.30 x 10-4 wbm^-2 (a) what is the instantaneous value of the emf induced in the wire? (b) what id the direction of …

Question 14.6: Current in a circuit falls from 5.0A to 0A is 0.1s. If an average emf of 200V induced, give an estimate of the self-inductance of the circuit.

Question 14.7: A long solenoid with 15turns per cm has a small loop of area 2.0cm^2 placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0A to 4.0A in 0.1s, what is the induced emf in the loop while the current is changing?

Question 14.8: A rectangular wire loop of sides 8cm and 2cm with a small cut is moving out of region of uniform magnetic field of magnitude 0.3T directed normal to the loop. What is the emd developed across the cut if the velocity of the loop is 1cm/s in a direction normal to the (a) …

Question 14.9: A 90-mm length of wire moves with an upward velocity of 35m/s between the poles of a magnet. The magnetic field is 80mT directed to the right. If the resistance in the wire is 5.00 m Ω, what are the magnitude and direction of the induced current?

Question 14.10: A pair of adjacent coils has a mutual inductance of 1.5H. If the current in one coil changes from 0 to 20A in 0.5s, what is the change of flux linkage with the other coil?