Octagon Posted May 27, 2017 Share Posted May 27, 2017 Hello What you think about this... Make a compass Magnetize the needle. Whether you use a sewing needle or other piece of metal, rub the object over the magnet. Always pull the needle in the same direction instead of back and forth with even movements. After 50 times the needle is magnetized. Use the same method to magnetize the needle with silk, fur or hair. Pull the needle 50 times over the object to magnetize it. Do not use these soft things when the needle is made of a razor blade. If you magnetize with a piece of steel or iron, knock on the needle to magnetize it. Put the needle in a piece of wood and tap 50 times on its tip. http://de.wikihow.com/Einen-Kompass-herstellen If, however, the rod is held precisely in the north-south direction when hit, it can be magnetized again. The inner magnets are ... https://books.google.de/books?id=5qL4CnMSKc0C&pg=PA15&lpg=PA15&dq=schlagen+magnetisie#v=onepage&q&f=false Would it be possible to magnetize them? This would also produce an interesting magnetic field. The poles could then be inside and outside. What you think about it? Greetings Octagon Link to comment Share on other sites More sharing options...
Country Boy Posted May 27, 2017 Share Posted May 27, 2017 Your "links" don't work so it is impossible to know what you are asking. "Would it be possible to magnetize" what? Link to comment Share on other sites More sharing options...
swansont Posted May 27, 2017 Share Posted May 27, 2017 What all does this have to do with a rotating disk? Link to comment Share on other sites More sharing options...
Sensei Posted May 27, 2017 Share Posted May 27, 2017 Use the same method to magnetize the needle with silk, fur or hair. Pull the needle 50 times over the object to magnetize it. This sounds to me like method of electrostatic charging.. Link to comment Share on other sites More sharing options...
Octagon Posted May 27, 2017 Author Share Posted May 27, 2017 I mean a rotating disk made of steel. There are great forces when this turns very fast. I don't mean eletrostatic charging, i mean to magnetize a Material only with a force. Link to comment Share on other sites More sharing options...
swansont Posted May 27, 2017 Share Posted May 27, 2017 I mean a rotating disk made of steel. There are great forces when this turns very fast. I don't mean eletrostatic charging, i mean to magnetize a Material only with a force. Why would this magnetize the material? Link to comment Share on other sites More sharing options...
Octagon Posted May 27, 2017 Author Share Posted May 27, 2017 I think the force of the rotation would magnetize it. Link to comment Share on other sites More sharing options...
John Cuthber Posted May 27, 2017 Share Posted May 27, 2017 Hitting a piece of steel will (sometimes) magnetise it- but only because it is in the magnetic field of the Earth. Rotating the steel wouldn't work. Link to comment Share on other sites More sharing options...
swansont Posted May 27, 2017 Share Posted May 27, 2017 The loewst energy state of the magnetic domains is random alignment, leading to an unmagnetized state. So I don't see how rotation would cause magnetization. Link to comment Share on other sites More sharing options...
Octagon Posted May 27, 2017 Author Share Posted May 27, 2017 Hitting a piece of steel will (sometimes) magnetise it- but only because it is in the magnetic field of the Earth. Rotating the steel wouldn't work. Are you sure? Because in the first Link stands it other. There it goes only with tapping on it. Link to comment Share on other sites More sharing options...
John Cuthber Posted May 27, 2017 Share Posted May 27, 2017 Are you sure? Because in the first Link stands it other. There it goes only with tapping on it. In a fixed magnetic field- from the Earth. But if your disk is rotating- what direction will it be magnetised in? Link to comment Share on other sites More sharing options...
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