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Magnetic field of a linear conductor

  1. Sep 12, 2008 #1
    Anyone can tell me why there is a -ve for the z= -r cot theta for the picture shown below? thanks!

    magnetic.jpg
     
  2. jcsd
  3. Sep 12, 2008 #2

    Defennder

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    Because z is negative with respect to the horizontal line passing through the linear conductor which I take to be z=0.
     
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