How to make the world´s simplest electric vehicle | Homopolar Electric train motor battery

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This video shows you how to make the world´s simplest electric vehicle that spins forever. For this experiment you need a three button cell batteries, two neodym magnets and a thin copper wire.
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It's really great and amazing make more such videos

jaspalsinghwasalwasal
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If this vid is really real, I didn't understand the physics behind it. How does it excitate the movement again and again? Thanks for some explanation...

edimahler