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Biot Savart Law?

  1. Mar 6, 2016 #1
    1. The problem statement, all variables and given/known data
    A straight wire caries a 10.0−A current (the figure(Figure 1) ). ABCD is a rectangle with point D in the middle of a 1.10−mm segment of the wire and point Cin the wire. Find the magnitude and direction of the magnetic field due to this segment at the following points.

    2. Relevant equations
    dB = μ*i/4*pi*r ds
    B = μ*i*L/4*pi*r

    3. The attempt at a solution
    to find the magnetic field at A, would i integrate along ds to get to the second equation then plug in the necessary information?
  2. jcsd
  3. Mar 6, 2016 #2


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    Integrate the first equation over the 1.1 mm length indicated. Use the vector form of the B-S Law to properly capture the geometrical relationship between the current element and the observation points. Your second equation is only valid for the field away from an infinitely long current--not your situation.
  4. Mar 6, 2016 #3
    okay, so would i get that my radius = 5cm as well?
  5. Mar 6, 2016 #4


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    Well, r is distance (diagonal) from source to observation so it varies.
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