Currents bound inside the atoms of strong magnets can create counter-rotating currents in a copper or aluminum pipe. This is done by dropping the magnet through the pipe. When done, the descent of the magnet is observably slower than when dropped outside the pipe.

In electromagnetism, Lenz’s law states that the direction of an induced electric current is such as to oppose the change that causes it. Lenz’s law would therefore appear to be closely related to the law of conservation of energy, apart from the fact that it operates in conjunction with non-conservative forces. It will now be shown that Lenz’s law is a manifestation of the ongoing transfusion of aether between the positron sources and the electron sinks of the luminiferous medium. Energy in the form of pressurized aether is drawn up from the luminiferous medium by a pumping mechanism which sometimes resembles an Archimedes’ screw. This pumping mechanism will involve the simultaneous sinking of already existing pressurized aether. 

Lenz's Law, a law of electromagnetic induction formulated in 1833 by the German physicist H. F. E. Lenz. It states that when an electric current is induced in a conductor, the direction of the current is such that its magnetic effect will oppose the action that gives rise to the current.

Lecture 16: Electromagnetic Induction, Faraday's Law, Lenz Law, Complete Breakdown of Intuition, Non-Conservative Fields

Heinrich Friedrich Emil Lenz (Russian: Эмилий Христианович Ленц) (February 12, 1804 – February 10, 1865) was a Russian physicist of Baltic German ethnicity. He is most noted for formulating Lenz's law in electrodynamics in 1833.
Lenz was born in Dorpat (now Tartu), the Governorate of Livonia, in the Russian Empire at that time. After completing his secondary education in 1820, Lenz studied chemistry and physics at the University of Dorpat. He traveled with the navigator Otto von Kotzebue on his third expedition around the world from 1823 to 1826. On the voyage Lenz studied climatic conditions and the physical properties of seawater. The results have been published in "Memoirs of the St. Petersburg Academy of Sciences" (1831).

A square coil of conducting wire of side 10.0 cm contains 50 loops. It lies so that it is perpendicular to a uniform magnetic field of strength 5.00 x 10-4 T. If the coil is suddenly rotated through 90.0o in a time of 2.50 x 10-3 s, estimate the magnitude of the voltage temporarily induced in the coil.

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