A Simple Homopolar Motor

A Simple Homopolar Motor

For an annual outreach event at my institution I’m putting together a few easy experiments around electromagnetism. The program for high school students is aimed at getting them interested in STEM.

Searching the internet I found a beautifully simple example of an homopolar motor. All that is needed is:

  • A AA battery
  • A few disk shaped Neodymium magnets, slighty larger diameter than the battery
  • Bare copper wire (I used 14 AWG)

The battery sits on the stacked magnets. The wire is bent into any (symmetrical) form, with a pivot point in top center to be placed on the ‘+’ pole of the battery and a circular shape around magnets.

This is what I came up with:

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