Physicist Emil Lenz (pronounced //) formulated Lenz's law in 1834, after which it was named for him.
For current I that generates a magnetic field
The induced current generated
Theoretical Lenz's law
Def. "a law of electromagnetic induction which states that an electromotive force, induced in a conductor, is always in such a direction that the current it would produce would oppose the change which caused it; it is a form of the law of conservation of energy" is called Lenz's law.
- Emil Lenz (1834). "Ueber die Bestimmung der Richtung der durch elektodynamische Vertheilung erregten galvanischen Ströme". Annalen der Physik und Chemie 107 (31): 483–494. http://gallica.bnf.fr/ark:/12148/bpt6k151161/f499.image.r=lenz.langEN. Retrieved A partial translation of the paper is available in W. M. Magie, (1963), A Source Book in Physics, Harvard: Cambridge MA, pp. 511–513.
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