Lenz’s Law of Electromagnetic Induction
Lenz’s law is based on Faraday’s law of induction. We should know what is Faraday’s law of induction we should understand Lenz’s law. When the conductor is placed in a change in a magnetic field there will be an emf is induced in it.
Change in the magnetic field may be caused by moving a magnet towards or away from the coil. Or moving the coil into or out of the magnetic field as desired.
In simple words, we can say that the magnitude of the emf induced in the circuit is proportional to the rate of change of flux.
Lenz’s Law states that the induced electromotive force (EMF) generated in a closed circuit always opposes the change which produced it.
The negative sign used in Faraday’s law of electromagnetic induction indicates that the induced emf ( ε ) and the change in magnetic flux (δΦB) have opposite signs.
ε = Induced emf
δΦB = change in magnetic flux
N = No of turns in the coil
Reason for Opposing, Cause of Induced Current in Lenz’s Law?
As stated above, Lenz’s law obeys the law of conservation of energy. If the direction of the magnetic field that creates the current and the magnetic field of the current in a conductor is in the same direction.
Then these two magnetic fields would add up and produce a current of twice the magnitude and this would, in turn, create more magnetic fields. This will cause more current, and this process continues on and on leading to violation of the law of conservation of energy.
Faradays Law of Electromagnetic Induction
In 1831, the English scientist Michael Faraday discovered the laws of electromagnetic induction. which are the basic principles of electricity and electronics. The first of these laws state that when a current-carrying wire is moved within a magnetic field, an electrical current is produced in the conductor.
This discovery was the foundation of modern electrical engineering and led to the invention of electric generators, transformers, and electric motors.
The second law states that the magnitude of the current generated in a wire is proportional to the strength of the magnetic field and the amount of wire exposed to it.
Do people ask Questions?
What does Faraday’s Second Law of Electromagnetic Induction state?
Faraday’s first second law of electromagnetic induction states that the induced emf in a coil is equal to the rate of change of flux linkage.
Why are Faraday’s laws important?
Faraday’s law describes how changing magnetic fields can cause current to flow in wires.
What does the negative sign indicate in Faraday’s law of electromagnetic induction formula?
The negative sign indicates that the direction of the induced emf and change in the direction of magnetic fields have opposite signs.
What is EMF?
Electromotive force or emf is a measurement of the energy that causes current to flow through a circuit.