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A material/ substance that does not allow the through it

  1. Dec 30, 2006 #1
    Has any one invented a material/ substance that does not allow the field of a magnet through it
     
  2. jcsd
  3. Dec 30, 2006 #2

    Hootenanny

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    Google: Magnetic Shielding
     
  4. Dec 30, 2006 #3

    marcusl

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    Superconductors also have that property. Specifically, Type 1 superconductors expel flux perfectly up to a critical field where they can no longer keep the field out. This is called the Meissner effect.
     
  5. Dec 30, 2006 #4

    ranger

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    You can read up more on Diamagnetism. A superconductor is a perfect diamagnet, where it keeps magnetic fields from its interior. But a superconductor cannot keep a magnetic field out for all intensities. Once the critical field is met, it looses its perfect Diamagnetism and can no longer oppose magnetic fields.
     
  6. Dec 30, 2006 #5
    thanks for your replies, very helpfull in my quest for a perpetual motion machine using magnetism and gravity
     
  7. Dec 30, 2006 #6

    Gokul43201

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    They're only helpful if they've convinced you to abandon the quest!
     
  8. Dec 30, 2006 #7
    Reading another post about gravity being a type of energy, from which i derived it isn't. Therefore a PM machine using only gravity and magnetism does not break the law of energy conservation. Im sure there's more to it than that, if any could enlighten me i would be gratefull.


    https://www.physicsforums.com/showthread.php?t=138215
     
  9. Dec 30, 2006 #8

    marcusl

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    Perpetual motion is simply not allowed by thermodynamics. Please save yourself the time of a wild goose chase. If you insist on continuing, at least spare the poor readers of PF forum from yet another fruitless thread.

    Thanks!
     
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