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Magnets and electromagnet power?

  1. Mar 1, 2007 #1
    Magnets and electromagnet power?

    It’s said in the <crackpot link removed - Zz> e-books that high voltage 5000v DC electromagnets are more powerful that low voltage 12V DC electromagnets.

    And in the permanent magnet motor it’s said that “The Attraction of a magnet ( North ) is always stronger than the Repulsion ( South ) “

    Are this statement true or false, it’s starting to confuse me?
    Last edited by a moderator: Mar 1, 2007
  2. jcsd
  3. Mar 1, 2007 #2


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    Please note that, per our guidelines, crackpottery (and so, free advertisement for crackpot links) are not permitted.

    While there is some "value" to discussing why such crackpottery is wrong, unfortunately, considering just now many there are out there, we will be swamped with these things. We have tried it, and it didn't work.

    So in case it is still isn't clear, we do not do any discussion about crackpot ideas or provide free advertisement of their websites. Period!

  4. Mar 1, 2007 #3
    Ok sorry, no problem with that “crackpot link” You’ll do me a favor if you can report them as fraud, if they are talking crap, did you think I’ve actually paid for that e-books, so no money is lost

    But to come back to the “crackpot link” statements, are that true or false, if I’m correct this is the right place to discuss that kind of questions
  5. Mar 1, 2007 #4
    To answer your question #2:

    The North is not stronger than the south.

    And #1:

    Maxwell's equation for static electromagnetics states that the circulation of the magnetic field for a surface S bounded by the curve C is equal to the flux of electrical current through S divided by a constant. This means that the magnetic field is dependent on the current, NOT the voltage. So number 1 is wrong too if you put enough resistance on the high voltage case.
    Last edited: Mar 1, 2007
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