# Lenz's law

Physicist Emil Lenz (pronounced /ˈlɛnts/) formulated Lenz's law in 1834, after which it was named for him.

## Magnetic fields

"The direction of current induced in a conductor by a changing magnetic field due to Faraday's law of induction will be such that it will create a field that opposes the change that produced it."[1]

For current I that generates a magnetic field

${\displaystyle B=LI}$

The induced current generated

${\displaystyle -\phi =-NB=-NLI}$

## 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"[2] is called Lenz's law.

## References

1. Emil Lenz (1834). "Ueber die Bestimmung der Richtung der durch elektodynamische Vertheilung erregten galvanischen Ströme". Annalen der Physik und Chemie 107 (31): 483–494. 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.
2. SemperBlotto (24 March 2006). "Lenz's law, In: Wiktionary". San Francisco, California: Wikimedia Foundation, Inc. Retrieved 2017-05-25.