Racing Rings consists of three rods one each of copper, aluminum and PVC, Ring magnet is dropped down the PVC rod, it falls unobstructed, Two metal rods create an induced magnetic field to that adds resistance to the rings travel, metals are different, they fall at different rates
Current Balance, used as an accessory to Air Core Solenoid to measure the force experienced by a conducting loop carrying an electric current when, placed in a magnetic field.
Hall Effect Apparatus, Features: n-type GaAs Hall sensor chip, Two-axis mechanical traverse for field plotting, 3-1/2 digit current and voltage meters, Metal storage case for the Hall Effect board, Reversing switch for exploring the elimination of systematic error