The Lenz's law reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Lenz's law

Lenz's law gives the direction of the induced emf resulting from electromagnetic induction, thus:

The emf induced in an electric circuit always acts in such a direction that the current it drives around the circuit opposes the change in magnetic flux which produces the emf.

The law is named after the Baltic German physicist Heinrich Lenz, who formulated it in 1834.

See Maxwell's equations for further mathematical treatment.

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