Q 15.1: An EMF of 0.45V is induced between the ends of a metal bar moving through a magnetic field of 0.22T. What field strength would be needed on EMF of 1.5 V bet. The ends of the bar, assuming that all other factors remain the same?

Q 15.2: The flux density B in a region between the pole faces of a horse shoe magnet 0.5 wb/m(2) directed vertically downwards. Find the EMF induced in a straight wire 5cm long, perpendicular to B when it is moved in a direction at an angle of 60degree with the horizontal with a speed of …

Q 15.3: A coil of wire has 10 loop. Each loop has an area of 1.5 * 10 (-3)m(2). A magnetic field perpendicular to the surface of each loop at all times. If the magnetic field is charged from 0.05T to 0.06T in 0.1 sec. Find the average EMF induced in the coil during this …

Q 15.4: A circular coil has 15 turns of radius 2cm each. The plane of the coil is inclined at 40 degree to a uniform magnetic field of 0.2T. If the field is increased to 0.5T in 0.2 sec, find the magnitude of the induced EMF.

Q 15.5: Two coils are placed side by side. An EMF of 0.8V is observed in one coil when the current is changing at the rate of 200 A/s in the other coil. What is the mutual inductance of the coils?

Q 15.6: A pair of adjacent coils has a mutual inductance of 0.1H. If the current in the primary changes from 0 to 10 A in 0.25s, what is the average induced EMF in the secondary? What is the change in flux in it if the secondary has 500 turns?

Q 15.7: A solenoid has 250 turns and its self inductance is 2.4 mH. What is the flux through each turn when the current is 2A? What is the induced EMF when the current changes at 20 A/s?

Q 15.8: A solenoid of length 8cm and cross sectional area 0.5cm(2) turns. Find the self inductance of the solenoid when the core is air. If the current in the solenoid increases through 1.5A in 0.2 sec, find the magnitude of induced EMF in it.

Q 15.9: When current through a cell changes from 100 mA to 200 mA in 0.005 sec, an induced EMF of 40 mV is produced in the coil. (a) What is the self inductance of the coil? (b) Find the increase in the energy stored in the coil.

Q 15.10: Like any field, the Earth’s magnetic field stores energy. Find the magnetic energy stored in a space where strength of earth’s field is 7 * 10(-5) T, if the space occupies an area of 10 * 10(8)m(2) and has a height of 750m.