Faraday’s laws of induction imply that the emf induced in a coil of N
turns is directly related to the rate of change of flux through it,
dB
Nd
Φt
ε = −
Here FB is the flux linked with one turn of the coil If the circuit is
closed, a current I = e/R is set up in it, where R is the resistance of the
circuit 3 Lenz’s law states that the polarity of the induced emf is such that it
tends to produce a current which opposes the change in magnetic flux
that produces it