A bar magnet is suspended so that it can swing as a pendulum, just clearing the lecture bench at the bottom of the swing. When a copper sheet is placed on the lecture bench, the pendulum comes to a quick stop, due to the damping casused by eddy currents generated in the copper.
|mass and magnet on a string||021-5C|
|piece of copper||Above 021-23|
|small rod and clamp||Ring stand in SW 017|