Permanent magnets are mounted in an adjustable iron yoke to produce a strong field volume. Aluminum plates: 1 solid, 1 with rectangular openings, and 1 cut with multiple slots, are allowed to swing through the magnet gap.

Induced currents in the aluminum plates will cause strong motion damping in the solid plate, moderate damping in the plate with openings, and no damping in the slotted plate due to circular currents induced by the motion through the magnetic field.

This demo can be found along the back wall of the UCSD PUL Demo Room (WLH 2015).