Lenz's law

Lenz’s law is an extension of Faraday’s law of induction. It states that:¹

An induced current flows in a direction such that the magnetic field it produces will oppose the change in the magnetic flux that induces the current.

The electromotive force induced is in the direction of the induced current.

Footnotes

1. “Nature abhors a change in flux.” - David J. Griffiths, in Introduction to Electrodynamics. ↩