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Long straight wire/ magnetic field

  1. Oct 18, 2007 #1
    this seems a very basic question when i write it, but i don't understand this: when you are dealing with a "long straight" wire, a wire that you cannot see the top or bottom of, then why do you consider the upper angle to be pi?
    i know why the lower angle is considered 0; it is so small... this might be more of a math question.

    if i need to post a picture so you can understand what I am talking about, please let me know.
    Last edited: Oct 18, 2007
  2. jcsd
  3. Oct 18, 2007 #2


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    is pi 180º?? And isn't a long straight line 180º??? Not sure if that's what you wanted the diagram would be nice to see.

    Also isn't there a homework thread lol ;)
  4. Oct 18, 2007 #3
    aw, i feel dumb. that makes sense... let us never speak of this again.
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