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Feynman's apparent paradox - Electromagnetism

  1. Apr 16, 2009 #1
    Feynman's "apparent" paradox - Electromagnetism

    This is the paradox discussed in chapter 17 of "Feynman Lectures on Physics - Vol II"

    http://www.flickr.com/photos/37453425@N07/3447068420/

    Say suppose the battery drains out or somehow you stop the current outta the battery. By electromagnetic laws, the disc ought to rotate... but then that violates the law of conservation of angular momentum (since no external torque is being applied)

    I suggest you read the "apparent" paradox in the book.
     
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Apr 16, 2009 #2
  4. Apr 16, 2009 #3

    dx

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    Re: Feynman's "apparent" paradox - Electromagnetism

    No paradox, the electromagnetic field can have angular momentum.
     
  5. Apr 19, 2009 #4
    Re: Feynman's "apparent" paradox - Electromagnetism

    Ooh... thnx :)
     
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