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Could a superconductor make a perpetual flow of electrons with the presence of a magnet in the cold vacuume of space? Answered

I just thought of this question and it has been a while since I studied superconductors.

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Jack A LopezBest Answer (author)2012-10-26

Uh... I guess so. How cold is space, I mean the cosmic background,
http://en.wikipedia.org/wiki/Cosmic_Background_Explorer#Black-body_curve_of_CMB

That's like what? 2.7K. 

How cold is the critical temperature of your  superconductor?
http://en.wikipedia.org/wiki/Superconductivity

Like 90K. 

Since 2.7K < 90 K, well then, I guess there's your answer. 

Just try to keep your experiment out of the sunlight.  Things exposed to sunlight, in space, can get warm.  But as long as you keep it in shadow then, I think you can easily keep it cool, close to that  ideal of 2.7 K, in equilibrium with the radiation background.



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So yeah.  Space is really, really cold.  That's just one of the things I learned from watching this documentary:

The Old Negro Space Program
http://www.youtube.com/watch?v=T6xJzAYYrX8

I think I originally saw it  one on public television. 

Erm... I know, this link looks a little iffy, but just give it a chance. It's not as bad as you think.
;-)

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lemonie (author)2012-10-26

Superconductors already make a perpetual flow of electrons, which goes with a magnetic field.
These are "superconducting magnets".
Note that if you interfere with the magnetic field that you take energy out and lose the perpetuity.

L

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nerd7473 (author)lemonie2012-10-27
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steveastrouk (author)nerd74732012-10-27

You need a.) low temperature b.) A superconductor

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bwrussell (author)2012-10-26

No, the magnet needs to move to generate a current.

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steveastrouk (author)2012-10-26

Start a flow, keep it cold, and you don't need the magnet.

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