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I rolled 50 meters of copper wire unglazed up to form a tube which can go a rechargeable AA and some neodymium magnet and the result is amazing, you watch the video.
For this experiment i have used Duracell Rechargeable battery
http://amzn.to/2mcLGHQ
this is the copper wire
http://amzn.to/2ldnFPr
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