Lenz's law
The Russian scientist H.F.Lenz in 1835 discovered a simple law giving the direction of induced current produced in a circuit. Lenz's law states that the induced current produced in circuit always flows in such a direction that it opposes the change or cause that produces it.
If the coil has N number of turns and φ is the magnetic flux linked with each turn of the coil then, the total magnetic flux linked with the coil at any time is Nφ
e= -d(Nφ)/dt
e= -Ndφ/dt
= -N(φ1 - φ2)/t
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