This is the most fun homopolar motor I’ve ever done, the magnet car. I found the right combination of battery, total weight and magnet power. The acceleration and speed are so high that the rotor slides on the aluminum foil due to centrifugal force.
For those who do not yet know this experiment it is an homopolar motor. The battery is short-circuited. The magnetic field of permanent magnets and the magnetic field generated by the current passing from the tin foil interact, causing the rolling of the battery
This is my first video on this kind of homopolar motor