Faraday’s-Law-of-Induction-With-Application

Faraday’s Law of Induction With Application 

Various laws bind the world of science. One such law is known as Faraday’s law of electromagnetic induction. This basic law of electromagnetism predicts how a magnetic field will interact with an electric circuit to produce an electromotive force. This phenomenon is known as electromagnetic induction. The law was first proposed in 1831 by an experimental physicist and chemist named Michael Faraday. Hence, the law is the results of the observations of the experiments conducted by the scientist. To form the final law on electromagnetic induction, he performed three main experiments. In this guide, you’ll read about his two main laws and their applications.

 

Also read:-

7 Types of Energy in Physics

 

Faraday’s First Law

The First law states that any change in the magnetic field of the coil of wire will cause induction of an EMF in it. Faraday and Henry carried out many experiments on a long series of experiments to discover electromagnetic induction. As per his observation, he concluded that an EMF is induced in the coil when the magnetic flux across the coil changes with the time. 

 

Hence the law states that:-

“Whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. If the conductor circuit is closed, a current is induced, which is called induced current.”

 

How to Change the Magnetic Law Intensity in a Closed Loop?

To change the magnetic law intensity in a closed-loop, the following measures can be taken. 

 

  • Rotate the coil relative to the magnet
  • Move the coil into or out of the magnetic field 
  • Change the area of a coil placed in the magnetic field
  • Move a magnet towards or away from the coil

 

Faraday’s Second Law 

The second law states that the magnitude of emf induced in the coil is equal to the flux rate linked with the coil. The given flux is the product of the number of turns in the coil and the coil’s flux. 

 

Ε = −N Δϕ / Δt

 

Where,

  • ε is the electromotive force
  • Φ is the magnetic flux
  • N is the number of turns

Faraday’s Law Formula

Consider a magnet approaching towards a coil. The two-time instances T1 and T2. 

 

Flux linkage with the coil at the time T1 is given by

T1 = NΦ1

Flux linkage with the coil at the time T2 is given by

T1 = NΦ2

Change in the flux linkage is given by

N(Φ2 – Φ1)

Let us consider this change in flux linkage as

Φ = Φ2 – Φ1

Hence, the change in flux linkage is given by

The rate of change of flux linkage is given by

NΦ/t

Taking the derivative of the above equation, we get

N dΦ/dt

According to Faraday’s second law of electromagnetic induction, we know that the induced emf in a coil is equal to the rate of change of flux linkage. Therefore,

E = −N dϕ / dt

 

Considering Lenz’s law,

E = −Ndϕ / dt

 

From the above equation, we can conclude the following.

Increase in the number of turns in the coil increases the induced emf.

Increasing the magnetic field strength increases the induced emf.

Increasing the speed of the relative motion between the coil and the magnet results in the increased emf

Applications of Faraday’s Law

The things around us that work on Faraday’s law include:  

  • Power transformers
  • Electrical generator’s 
  • The induction cooker
  • Electromagnetic flowmeter
  • Electric guitar, electric violin