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Thread: Is a Magnet's Field Attached to It?

  1. #1 Is a Magnet's Field Attached to It? 
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    Is a magnet's field attached to it? I always thought so, but now I find that if an electrically conducting disk magnet (with the faces the poles) is rotated like a wheel, an emf is developed between the center and the rim. This is a case of motional emf but the conductor is cutting its own magnetic field lines.


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    Moderator Moderator Markus Hanke's Avatar
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    Quote Originally Posted by Mike La Moreaux View Post
    but now I find that if an electrically conducting disk magnet (with the faces the poles) is rotated like a wheel, an emf is developed between the center and the rim.
    I am finding it difficult to picture this setup, and the field you describe. In my mind the field lines will exit perpendicular to the surface, and then curve around the edge of the disk, and re-enter perpendicularly on the other side. Why would they intersect themselves ?
    Do you have a diagram for this setup ?


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  4. #3  
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    They do not intersect themselves. As the disk rotates the material of the disk cuts the parts of those field lines internal to the disk.
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