Question

Explain Faraday's law and also explain Lent's law. In Detail
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Answer 1

It is basic law of electromagnetism showing how a magnetic field will interact with an electric circuit to produce an electromotive force.

Lenz's law electromagnetic field is generated by a change in magnetic flux the polarity of the induced electromagnetic field produces an induced current whose magnetic field opposes the initial changing magnetic field

Answer 2

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Faraday’s laws describe how an electric current produces a magnetic field and conversely how a change in the magnetic field will produce a current through the conductor. There are two laws of electromagnetic induction as stated by Michael Faraday.

I Law: Whenever there is a change in the magnetic flux linked with a circuit an emf and hence a current is induced in the circuit. The induced emf lasts as long as the change in flux persists.

II Law: The magnitude of the induced emf is directly proportional to the rate of the change of magnetic flux linked with the circuit.

The direction of the induced current in the circuit is given by Lenz’s law. According to the law, the induced current is always in such a direction as to oppose the cause which is producing it.

Lenz’s law states that

The induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that original flux is maintained through the loop when current flows in it.

Named after Emil Lenz, Lenz’s law depends on the principle of conservation of energy and Newton’s third law. It is the most convenient method to determine the direction of the induced current. It states that the direction of an induced current is always such as to oppose the change in the circuit or the magnetic field that produces it.

Lenz’s Law Formula

The Lenz’s Law is reflected in the formula of Faraday’s law. Here the negative sign is contributed from Lenz’s law. The expression is –

Emf=−N(Δϕ/Δt)

Where,

Emf is the induced voltage (also known as electromotive force).

N is the number of loops.

Δϕ Change in magnetic flux.

Δt Change in time.

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