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The induced emf in a material opposes the flux producing it. This is(a) Faraday law(b) Ampere law(c) Lenz law(d) Curie lawI have been asked this question in a job interview.Origin of the question is Magnetic Energy and Circuits in section Magnetic Forces and Materials of Electromagnetic Theory

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Right answer is (c) LENZ law

To explain I would say: The induced EMF in a material under the INFLUENCE of a MAGNETIC field will oppose the flux that PRODUCES it. This is indicated by a negative sign in the emf equation. This phenomenon is called Lenz law.



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