The Metal Ring is for use with a Thomson Coil to perform the ring experiment. The metal ring must be paired with a mains coil and a transformer U-core with yoke.
Experiment Process:
Metal ring is fitted around one stem of the U-core and allowed to rest on the mains coil
Stem of the U core is extended by the yoke positioned vertically on top of it
Switch on the mains coil and watch the ring jump into the air!