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Homework Help: Magnetic field integral (B)

  1. Dec 4, 2007 #1
    1. The problem statement, all variables and given/known data

    What is the line integral of B (vector) between points i and f in the figure?


    2. Relevant equations

    ∫B ds = BL ??

    3. The attempt at a solution

    What equation would I use for this?
  2. jcsd
  3. Dec 4, 2007 #2


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    Homework Helper

    Notice that the wire is perpendicular to the "page" with the current running "into the page", that is, away from you. What does the magnetic field around this wire look like? How does ds point relative to the wire? What equation have you learned about that involved a line integral of B ds?
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