The Russian physicist Heinrich Lenz discovered in 1833 the directional relationships among the forces, voltages, and currents of electromagnetic induction. Lenz's law says:
An induced electromotive force generates a current that induces a counter magnetic field that opposes the magnetic field generating the current.
Thus, when an external magnetic field approaches a conductor, the current that is produced in the conductor will induce a magnetic field in opposition to the approaching external magnetic field. But when the external magnetic field moves away from the conductor, the induced magnetic field in the conductor reverses direction and opposes the change in the direction of the external magnetic field.
An induced electromotive force generates a current that induces a counter magnetic field that opposes the magnetic field generating the current.
Thus, when an external magnetic field approaches a conductor, the current that is produced in the conductor will induce a magnetic field in opposition to the approaching external magnetic field. But when the external magnetic field moves away from the conductor, the induced magnetic field in the conductor reverses direction and opposes the change in the direction of the external magnetic field.
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