Explain why, the direction of induced current in the coil of an A.C. generator changes after every half revolution of the coil.
Solution. After every half revolution, each side of the generator coil starts moving in the opposite
direction in the magnetic field. The side of the coil which was initially moving downwards in the magnetic
field, after half revolution, it starts moving in opposite direction – upwards. Similarly, the side of coil
which was initially moving upwards, after half revolution, it starts moving downwards. Due to the change
in the direction of motion of the two sides of the coil in the magnetic field after every half revolution, the direction of
current produced in them also changes after every half revolution.