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Old 20th November 2004, 07:54 AM   #11
muhy3 is offline muhy3  Australia
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You said it yourself Sch3matic, a magnet would need to be spun at 24P RPM which from what I figure is preety much useless because at that speed the material would break up and any magnetic field will actually break apart/away from the magnet, kind of like bashing a magnet with a hammer, it will loose its magnetism, thats why electromagnets are used to control electron beams, and not used to produce light.
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Old 20th November 2004, 09:34 AM   #12
Prune is offline Prune  Canada
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There is no material that can spin that fast without breaking apart. Even a neutron star can't do it, despite the enormous gravity (not to mention that near the surface velocity would exceed the speed of light by many orders of magnitude, which is clearly ludicrous). So no, a magnet cannot directly produce light.
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Old 20th November 2004, 01:35 PM   #13
Prune is offline Prune  Canada
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I should qualify my statement as that it cannot produce light directly by means of its magnetism (as opposed to, say, its thermal black body radiation).
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Old 20th November 2004, 04:31 PM   #14
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Well no, but you could use a magnet spun at a more non-relativistic rate to generate radio frequency photons.

Oh - there ARE things which can move at that speed - electrons! Visible light photons are small enough that they can only cover a few molecules if you're lucky, so it's very easy for electrons to be individually manipulated.

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Old 20th November 2004, 06:33 PM   #15
Nasse is offline Nasse  Finland
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Hobbyists have done such energy storing lamps using a stepper motor as a generator. I saw one circuit there was just stepper motor, bridge rectifier, electrolytic cap, series resistor and superbright led

I think that torch under discussion was cheaper to construct without special generator, just a magnet or iron piece inside a plastic tube and coil wound around

But good idea, no batteries that go flat sooner or later. Or in cold weather when batteries freeze
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