MENTAL MODEL · M4405

Lenz's Law

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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

In electromagnetism, Lenz's law (Lenz's law) can find the direction of the electromotive force and induced current generated by electromagnetic induction. For the non-conservative forces involved in electromagnetic induction, this law can be regarded as an extension of the law of conservation of energy. Lenz's law was discovered by the Russian physicist Heinrich Lenz in 1834, and its content is: . Using only Faraday's law of electromagnetic induction, it is not easy to determine the direction of the induced current. Lenz's law provides a simple and intuitive method to find the direction of the induced current.

SCAFFOLDING EFFECT

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The direction of the induced current always hinders the change in magnetic flux that causes it (hinders rather than prevents). It embodies the manifestation of energy conservation in electromagnetism.

MINIMUM ACTION

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Practice this model in one real situation:

Determine the direction of magnetic flux change
use Lenz's law to determine the direction of induced current (increase opposite, decrease same)
combine with the right-hand rule to solve
used for braking/induction.

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Source support: Explicit

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zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E6%A5%9E%E6%AC%A1%E5%AE%9A%E5%BE%8BZH · Explicit
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