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The induced emf in a material opposes the flux producing it. This is

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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 law

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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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