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Here, we reproduce an experiment from high school physics: a permanent magnet falls through
a copper pipe. The temporal change of the magnetic field in the copper induces currents which
themselves create an opposing magnetic field that brakes the fall. As a result, an equilibrium for the magnet's velocity can be reached. This phenomena is also known as Len'z law.

References :

Yan, Silveira Fernando, Rizzato Felipe, ‚Electromagnetic braking : A
simple quantitative model‘, American Journal of Physics, Vol. 74, No. 9,
September 2006"