Faraday’s Laws
According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.
Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.
Induced emf `prop` Rate of change of magnetic flux
Wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is
Options:
(a) once per revolution
(b) twice per revolution
(c) four times per revolution
(d) six times per revolution