Simple electric motors

Simple electric motors

From the Russian site Zabatsay, some demonstration to build a simple electric motor, requires:

1. A Single AA battery
2. A couple of regular steel paper clips
3. Some sticky tape
4. Some enamelled copper wire or verowire
5. A knife or scraper

I don't know why it works properly with a DC power supply and no brushes. 

I think it maybe to do with an irregularly formed coil so that the magnetic field is uneven and there can be an average force.

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