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Magnetic Force + Wires

  1. May 31, 2007 #1
    1. The problem statement, all variables and given/known data
    A packed bundle of 100 long, straight, insulated wires forms a cylinder of radius R=.5cm

    a. if each wire carries 2A, what are the magnitude and direction of the magnetic force per unit length acting on a wire located .2cm from the center of the bundle?



    2. Relevant equations

    B = μoI / 2(pi)r
    ???

    3. The attempt at a solution
    I found B to be .008T. but now I don't know what to do.
     
  2. jcsd
  3. May 31, 2007 #2
    a packed bundle of wires that form a cylinder is a solenoid - thus you will ahve to find the magnetic field of a solenoid, and not that of a straight line ,as you have found
     
  4. May 31, 2007 #3

    Meir Achuz

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    No. It is a straight wire.
     
  5. May 31, 2007 #4

    Meir Achuz

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    Just use F/L=IXB.
     
  6. May 31, 2007 #5
    my mistake
    i thought the wires curved to form a cylinder but instead we have a cylindrical bundle of parallel wires
     
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