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Math Help - another amperes law question..

  1. #1
    MHF Contributor
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    another amperes law question..

    http://i31.tinypic.com/v8oeuq.jpg

    r by definition is the distance from the current source.
    but here its not
    why??
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  2. #2
    Junior Member
    Joined
    Aug 2009
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    i guess they are assuming the diameter of the tube to be negligible compared with r
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