This was the last lab that my students managed to do before all the private classes were canceled because of Coronavirus. They had to assemble a simple electric motor, using the concept of a magnetic field created by a wire loop, the concept of a magnetic moment, and a magnetic torque.
The ultimate "proof" that they have successfully assembled the engine is to show that it is constantly spinning, which is what it looks like:
This is a general experiment that has been done in many general physics labs, but is still a cool exercise. The students, of course, had the pleasure of doing so and felt a sense of accomplishment when they saw the turn in the movement.
I was glad we managed to turn it off.