Homopolar Motor
Wire spins with no visible gears or motor housing.
Teaching & key ideas
What you do: Assemble so current flows through wire in magnetic field.
What students see: Wire spins with no visible gears or motor housing.
Why it works: A current-carrying conductor in a magnetic field experiences a force that produces torque.
Question to ask: Where are the motor's 'moving parts'?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Where are the motor's 'moving parts'?