is an extension of the law of conservation of energy to the non-conservative forces in electromagnetic induction. It can be used to give the direction of the induced electromotive force (emf) and current resulting from electromagnetic induction.
Heinrich Lenz postulated in 1834 the following law,
"An induced current is always in such a direction as to oppose the motion or change causing it"
The law provides a physical interpretation of the choice of sign in Faraday's Law of induction, indicating that the induced emf and the change in flux have opposite signs.
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