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Homework Help: Exploding shoes

  1. Feb 21, 2008 #1
    Near earth, the density of protons in the solar wind is 10.0cm^-3, and their speed is 691 km/s.
    a) find current density of these protons
    b) what current in amperes does earth recieve

    a. To find the current density I need to multiply (nLA)e
    then after i get I divide it by A

    3. The attempt at a solution

    To find the current density I need to multiply (nLA)e

    do i need to convert 10.0 protons cm^-3 to 10000000m^-3 because i tried that and it didnt work????
    I guess my main question is do i have the conversions right:
    v= 691000 m/s
    n = 1 E7
    e= 1.6E-19
    the final answer i got was 1.11 E-7 (is this answer maybe negative?)
  2. jcsd
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