A long solenoid having 200 turns per cm carries a current of 1.5 amp. At the can be of it is placed a coil of 100 turns of cross-sectional area 3.14 x 10-4 m2 having its axis parallel to the field produced by the solenoid. When the direction of current in the solenoid is reversed within 0.05 sec, the induced e.m.f. in the coil is
Magnetic flux through each turn of the coil
When the current in the solenoid is reversed, the change in magnetic flux
Induced e.m.f.