Lenz's Law

Lenz’s law provides a means by which one can determine the direction of the electromotive force (emf) when using Faraday’s Law.

Lenz’s law states that the direction of the induced emf drives current around a wire loop to always oppose the change in magnetic flux that causes the emf.

In layman’s terms, the current opposes/resists the change in the magnetic field. If the field reduces in one direction, current will flow to create a magnetic field in that direction to compensate it momentarily.