Question

state and explain lenz law

Answer 1

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Lenz’s Law

Faraday’s  law does not give an explanation to the direction of the current. However, the Lenz law specifies the direction of the current induced inside the coil. Let us understand the Lenz law.

Lenz law of electromagnetic induction states that, when an emf induces according to Faraday’s law, the polarity (direction) of that induced emf is such that it opposes the cause of its production. According to Lenz’s law,

E = –dΦ/(dt)

Answer 2

The Lenz's law states that the current induced in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux and to exert a mechanical force opposing the motion.

The lenz's law, named after the physicist Emil Lenz who formulated it in 1834, states that the direction of the current induced in a conductor by a changing magnetic field is such that the magnetic field created by the induced current opposes the initial changing magnetic field. Or as informally, yet concisely summarised by D.J. Griffiths:

Nature abhors a change in flux.

Lenz's law is shown by the negative sign in Faraday's law of induction.