Eddy current brake in Cu pipe (cooled, uncooled)

A magnet is dropped in an uncooled and a cooled copper pipe. Since the resistance in the cooled copper pipe is lower than in the uncooled pipe, stronger eddy currents arise there. As a result, the magnet falls there much more slowly than in the uncooled copper pipe.

Caution: Experiment with LN₂ (eye damage and cold injuries possible)!
Personal protective equipment necessary!