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Magnetic Force question!

  1. Mar 26, 2013 #1
    1. The problem statement, all variables and given/known data
    Lightning strikes a lightning rod that is a thin, hollow cylinder with a radius of 1.0 cm with a peak current of 250 kA.
    What is the magnetic force on an infinitesimal segment (vertical line) of current of width dx and
    length L? [3]


    2. Relevant equations
    F = I[integral](dl)xB


    3. The attempt at a solution

    I calculated the magnetic field strength of B = 5.01 T
    I'm not really sure how to start this? How do I incorporate the width dx?
     
  2. jcsd
  3. Mar 27, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    You get the current if you multiply the current density by dx.
     
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