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Math Help - cant uderstand certain parts this another problem..

  1. #1
    MHF Contributor
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    cant uderstand certain parts this another problem..

    here is the problem and solution:
    http://i30.tinypic.com/2w2mnap.jpg

    why they divide into two cases?

    then they find a magnetic field

    but we dont have any electricity flowing??

    the i recognized the formula for a magnetic field from a wire
    but when we find a the formula from the biotsavart law
    the oly direction is dlX \hat{r}
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  2. #2
    Super Member Rebesques's Avatar
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    It goes without saying that there is a current flowing through the wire.
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