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Invisiblesherm
sherman
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Registered: 10/02/03
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super conductors, levitation, and energy in the system
    #8644140 - 07/16/08 06:56 PM (15 years, 10 months ago)

I was playing on wikipedia and i saw this superconductor article.
http://en.wikipedia.org/wiki/Superconductor

The articles says "An electric current flowing in a loop of superconducting wire can persist indefinitely with no power source", and does not cite a reference.
Is this correct? Is there no energy lost at all?

If you were to use this superconductor to levitate a magnet would energy be lost from the system holding the magnet up?

If no energy is lost from the system holding the magnet up could this superconductor loop be used to bounce the magnet?


this sounds like it wouldn't work but i don't know enough to know where this idea goes wrong.


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Offlinezouden
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Registered: 11/12/07
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Re: super conductors, levitation, and energy in the system [Re: sherm]
    #8645605 - 07/17/08 02:18 AM (15 years, 10 months ago)

This may surprise you (it surprised me) but it doesn't actually take any energy to hold things up. That's why a fridge magnet can stay on the fridge indefinitely, or an object resting on a table doesn't take energy out of the table.

Yes, a magnet will hover above a superconducting loop indefinitely.


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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: super conductors, levitation, and energy in the system [Re: sherm]
    #8646067 - 07/17/08 08:26 AM (15 years, 9 months ago)

Quote:

The articles says "An electric current flowing in a loop of superconducting wire can persist indefinitely with no power source", and does not cite a reference.
Is this correct? Is there no energy lost at all?



 
Yes, no energy lost at all.  Superconductors are perfect conductors with no resistance.



Like zouden says, it doesnt take energy to hold things up.  That is just a force and force is not energy.  But apply a force over a distance and you do consume energy.

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