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Any Magnet danger?

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Hello, I am new here and several of us have a few questions. We have seen several video's like this.


1. Are these actually powering a bulb?

2. How long would last if never stopped?

3. Any fire danger?

4. I have a retrieving that says it will lift 800 lbs.

5. Any danger of doing the same thing with the retrieving magnet?

6. How big a light will it power?

Thanks for looking. I am retired and have some kids asking me. I wonder also.

Edited by Versatile
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No. There's a trick involved (possibly an inductive source under the table). There is no fire danger if you recreated what's in the video, because no current will be flowing. 

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