Coil magnetic field polarity question

Discussion in 'General Electronics Chat' started by Piggins, Apr 5, 2015.

  1. Piggins

    Thread Starter New Member

    May 5, 2014
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    In the AAC book 1 chapter 14 part 2 , page 2 there is a picture of a coil being magnetized.

    http://sub.allaboutcircuits.com/images/00308.png

    Now I know im supposed to use the left hand rule to determine the location of the north pole. However im getting the opposite result for the polarity, can someone help?
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    3,371
    There are a number of problems with that diagram.

    1) Be aware that AAC tutorials use electron flow and not conventional current flow.

    2) That drawing still does not show which way the coil is wound. If you see it a certain way it is all in your mind. You can make it one way or the other simply by forcing your mind to think about it, just like the spinning dancer illusion.

    Actually, it is the Right Hand Rule for conventional current flow.

    [​IMG]
     
  3. Piggins

    Thread Starter New Member

    May 5, 2014
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  4. MrChips

    Moderator

    Oct 2, 2009
    12,452
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    Simple, if you use electron flow, then Right Hand Rule becomes Left Hand Rule.

    But then it gets confusing when you get to current generator (dynamo) because Lenz's Left Hand Rule becomes Right Hand Rule.

    How does one remember if you're coming or going?:rolleyes:
     
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