Faraday's Laws

Faraday's First Law:

• Any change in the magnetic field of a coil of wire will cause an emf to be induced in the coil. This emf induced is called induced emf and if the Conductor circuit is closed, the current will also circulate through the circuit and this current is called induced current.
• By moving a magnet towards or away from the coil.
• By moving the coil into or out of the magnetic field.
• By changing the area of a coil placed in the magnetic field.
• By rotating the coil relative to the magnet.

Faraday's Second Law:

• It states that the magnitude of emf induced in the coil is equal to the rate of change of flux that linkages with the coil. The flux linkage of the coil is the product of number of turns in the coil and flux associated with the coil.

• Consider a magnet approaching towards a coil. Here we consider two instants at time T₁ and time T₂.
  Flux linkage with the coil at time, T₁ = NΦ₁ Wb
  Flux linkage with the coil at time, T₂ = NΦ₂ wb
   Change in flux linkage = N(Φ₂ - Φ₁)
  this change in flux linkage be, Φ = Φ₂ - Φ₁
  So, the Change in flux linkage = NΦ
   Now the rate of change of flux linkage = NΦ / t
  Take derivative on right hand side we will get The rate of change of flux linkage = NdΦ/dt But according to Faraday's law of electromagnetic induction, the rate of change of flux linkage is equal to induced emf.