134 lines
5.8 KiB
Plaintext
134 lines
5.8 KiB
Plaintext
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| File Name : APERPETU.ASC | Online Date : 05/07/95 |
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| Contributed by : InterNet | Dir Category : ENERGY |
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The following file refers to 'A Perpetual Motion Idea'.
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From: nazrael@cats.ucsc.edu (James Vanmeter)
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Newsgroups: alt.sci.physics.new-theories
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Subject: Yet another idea for a perpetual motion machine...
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Date: 4 Jul 1994 03:33:58 GMT
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Organization: University of California; Santa Cruz
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Lines: 116
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Message-ID: <2v7vv6$p93@darkstar.UCSC.EDU>
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NNTP-Posting-Host: si.ucsc.edu
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An idea for a perpetual motion machine was recently presented to me and I
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can't find the flaw in it. It makes use of the Meissner effect and the fact
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that magnetic fields propagate at finite velocity.
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Imagine a bar magnet with an axle through its center, that is, in between the
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north and south poles. It is free to spin on its axle and is somehow mounted
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within and coaxial to a superconducting cylinder.
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The cross-sectional view looks like something like this:
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***
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* *
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* |S| *
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* |+| *
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* |N| *
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* *
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***
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except that the asterisks, representing the cylinder wall, are supposed to
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form a complete circle. Also, the radius of the cylinder is preferrably quite
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large, for reasons that will soon be made clear.
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Now the superconducting cylinder reflects the magnetic field of the bar
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magnet. Each pole of the magnet "sees" its reflected image in the cylinder
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wall, in effect creating virtual magnets:
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|N|
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|S|
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***
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* *
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* |S| *
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* |+| *
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* |N| *
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* *
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***
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|N|
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|S|
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(There would of course be virtual magnets all along the circumferrence, or
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equivalently one big cylindrical magnet with orientation opposite that of the
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bar magnet. But the above simplification seems good enough for purposes of
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illustration.)
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If we give the real magnet a spin, then the virtual magnets orbit it. If the
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magnetic fields propagated instantaneously, then the orbit of the virtual
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magnets would be in perfect synchrony with the spin of the real magnet, they
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would always be perfectly opposed as shown above, and the net effect on the
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real magnet would be nil. Thus the magnet would spin freely until friction on
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its axle eventually brought it to a halt.
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However the fields do not propagate instantaneously. The spinning magnet will
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rotate a bit before it receives its reflection -- a magnetic image of its
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orientation a moment ago. After an initial spin, the orbit of thevirtual
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magnets lags behind. The larger the radius of the cylinder andthus the
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greater the distance between it and the magnet, the greater thelag.
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An instantaneous snap-shot of the magnetic fields from the real magnet's
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perspective could look something like this:
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|N|
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|S|
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***
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* *
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* /S/ *
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* /x/ *
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* /N/ *
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* *
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***
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|N|
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|S|
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where the real magnet has been given an initial spin in the clockwise
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direction and the virtual magnets lag behind, say, 30 degrees at the moment
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depicted. Clearly the virtual magnets encourage the real magnet to keep
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spinning.I suspect that there is a flaw in my thinking, but it seems to me,
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and tothe person who proposed this to me, that with a proper set-up and after
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theinitial spin the virtual magnets will proceed to chase the real magnet
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aroundand around forever. The angular velocity of the magnet will increase,
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wefigure, until the phase-lag between it and the virtual magnets equals 180
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degreees:
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|N|
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|S|
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***
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* *
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* |N| *
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* |+| *
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* |S| *
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* *
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***
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|N|
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|S|
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(Note that a phase-lag of 180 degrees means that their orientationsare in
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phase, since the virtual magnets started out at rest with orientations 180 out
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of phase with the real magnet.) The angular velocity now remainsconstant.
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So for those who have followed all this, what's the flaw?
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Reply to : nazrael@cats.ucsc.edu (James Vanmeter)
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