Faraday’s Law of electromagnetic induction

 


First Law of magnetic induction:

Faraday’s first law states that induce emf or induce current in a circuit exists till the magnetic lux linked with the circuit changes.

If changing the magnetic flux is stopped the induce emf is also stopped.




Faraday’s second Law:

1) Faraday’s second law tells the amount of emf induce.

The law states that the amount of induce emf in a circuit is equal to the rate of change of magnetic flux through the circuit.



2) If      is the change of magnetic flux at time dt through the circuit then induce emf e is





If the circuit has N no of turns then





Here -ve sign tells that the induce emf is such that it opposes the change of magnetic flux, which will be discussed in Lenz’s Law.