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
The instantaneous magnetic flux linked with a coil is given by `phi= (5t^3 -100t + 300) Wb`. The emf induced in the coil at time `t = 2 s` is
Options:
(a) -40 V
(b) 40V
(c) 140V
(d) 300 V