## Lenz's law |

Part of a series of articles about |

**Lenz's law** (pronounced ^{[1]} states that the direction of current induced in a conductor by a changing

Lenz's law is shown by the negative sign in

which indicates that the induced ^{[2]} It is a qualitative law that specifies the direction of induced current but says nothing about its magnitude. Lenz's law explains the direction of many effects in

Lenz's law can be seen as analogous to ^{[3]}

For a rigorous mathematical treatment, see

- opposing currents
- detailed interaction of charges in these currents
- conservation of momentum
- references
- external links

This section
does not . (October 2017) ( |

If a change in the magnetic field of current *i*_{1} induces another *i*_{2}, the direction of *i*_{2} is opposite that of the change in *i*_{1}. If these currents are in two coaxial circular conductors *ℓ*_{1} and *ℓ*_{2} respectively, and both are initially 0, then the currents *i*_{1} and *i*_{2} must counter-rotate. The opposing currents will repel each other as a result.

Lenz's law states that the current induced in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux and to exert a mechanical force opposing the motion.

Currents bound inside the atoms of strong magnets can create counter-rotating currents in a copper or aluminum pipe. This is shown by dropping the magnet through the pipe. The descent of the magnet inside the pipe is observably slower than when dropped outside the pipe.

When a voltage is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced voltage is such that it produces a current whose magnetic field opposes the change which produces it. The induced magnetic field inside any loop of wire always acts to keep the magnetic flux in the loop constant. In the examples below, if the flux is increasing, the induced field acts in opposition to it. If it is decreasing, the induced field acts in the direction of the applied field to oppose the change.

Other Languages

العربية: قانون لينز

asturianu: Llei de Lenz

বাংলা: লেন্জের সূত্র

беларуская: Правіла Ленца

català: Llei de Lenz

čeština: Lenzův zákon

dansk: Lenz' lov

Deutsch: Lenzsche Regel

eesti: Lenzi reegel

Ελληνικά: Κανόνας του Λεντς

español: Ley de Lenz

Esperanto: Leĝo de Lenz

euskara: Lenzen legea

فارسی: قانون لنز

хальмг: Ленцин зокал

한국어: 렌츠의 법칙

हिन्दी: लेंज का नियम

hrvatski: Lenzovo pravilo

italiano: Legge di Lenz

עברית: חוק לנץ

magyar: Lenz-törvény

македонски: Ленцов закон

Nederlands: Wet van Lenz

日本語: レンツの法則

norsk: Lenz' lov

norsk nynorsk: Lenz-lova

Piemontèis: Lej ëd Lenz

polski: Prawo Lenza

português: Lei de Lenz

русский: Правило Ленца

Simple English: Lenz's law

slovenčina: Lenzov zákon

slovenščina: Lenzovo pravilo

српски / srpski: Ленцов закон

srpskohrvatski / српскохрватски: Lencov zakon

suomi: Lenzin laki

svenska: Lenz lag

தமிழ்: லென்சின் விதி

తెలుగు: లెంజ్ నియమం

Türkçe: Lenz yasası

українська: Правило Ленца

Tiếng Việt: Định luật Lenz

中文: 楞次定律