What is Faraday’s Law?

What is Faraday’s Law?

Faraday’s Law Definition

Faraday’s law of electromagnetic induction is defined as the principle that a changing magnetic field within an electric circuit produces an electromotive force.

First Law

Faraday’s first law states that any change in the magnetic environment of a coil induces an EMF, known as induced EMF, and, if the circuit is closed, induces current as well.

Method to change the magnetic field:

• 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

Second Law

Faraday’s second law clarifies that the induced EMF’s magnitude equals the rate at which the magnetic flux linkage through the coil changes.

Enhancing EMF

Increasing the coil’s number of turns, the magnetic field strength, or the relative motion speed between the coil and the magnet can amplify the induced EMF.

Faraday Law Formula

Flux Φ in Wb = B.A

B = magnetic field strength

A = area of the coil

Applications and Impact

• Power transformers function based on Faraday’s law

• The basic working principle of the electrical generator is Faraday’s law of mutual induction.

• Induction cookers

• It is also used in musical instruments like an electric guitar, electric violin, etc.