I built this quick experiment in my senior year of high school to test Ampere’s force law. It was inspired by a diagram in the physics textbook I used. Powered by a lithium-polymer battery, the circuit involves running current through a resistor (pencil lead) and safety fuse and then through the two U loops of magnet wire via contact with aluminum foil (See Figure 1). Because the two loops are carrying charges moving in opposite directions, the loops will produce magnetic fields that will cause them to repel. Hanging from the aluminum foil contacts, the loops are pushed apart at the bottom as the current flows through them (See Figure 2).
