Today my class made a homopolar motor the goal was to make the wire spin. Here’s what you need:
- A A battery ( any type).
- 10 to 15 cm of copper wire.
- neodymium magnet ( 3 to 4).
Now here’s how to make it:
- First you shape the copper wire with a hook at the top and a curl at the bottom.
- Then connect the magnet to the bottom of the battery.
- Next place the the copper wire on top of the battery. Make sure the tip of the hook is touching the top of the battery and the curl at the bottom is around the magnets.
- If it is all connected correctly, the copper wire should spin!
If it doesn’t work try again by changing the shape, making sure the ends are in the correct place and the battery is full. Hope you succeed and try it your self.
The Science!
When the electrons travel through the wire near the magnet’s field, they experience a special push or shove called the Lorentz force. This force acts like a tiny sideways nudge, trying to push the electrons in a specific direction. In a homopolar motor, the wire is usually shaped like a loop. Because the Lorentz force acts on the electrons throughout the loop, it creates a force that tries to rotate the entire loop around the center of the magnet. This is like lots of tiny pushes together to spin the wire.


