Magnetic Damping (Eddy Currents)

Magnetic damping of a solid copper plate moving through a magnetic field. A copper plate with slits (that prevents eddy currents from forming) is also available.

1. Attach the conical fittings onto the two poles of the magnet to concentrate the magnetic field.
2. Attach the Pasco pendulum rod to a rotary bearing (for example, the Pasco Rotary Motion sensor)
3. Mount the rod/bearing setup on a retort stand such that the pendulum rod is hanging at least 6" away from the stand..
4. The copper plates can be mounted on the pendulum rod with a 6-32 bolt (attached with the pendulum rod) and a knurled nut.
5. Position the large magnet such that the copper plate swings through the magnetic field between the poles of the magnet.

It is recommended to show the plate swinging freely at the start without the magnet. This can then be compared to what happens when the magnet is in place.

Historic Diagram: