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Homework Help: Magnetic field of a lightning bolt

  1. Oct 12, 2004 #1
    In a lightning bolt, 14 C of charge flows in a time of 1.5 x 10^-3 s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 27 m from the bolt?

    do i use 27 m as the radius in the equation

    [tex] B = \frac {\mu I}{2\pi r} [/tex]
    Last edited: Oct 12, 2004
  2. jcsd
  3. Oct 13, 2004 #2


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    Yes! That's just Ampere's law applied to a cylindrically symmetric current.
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