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Homework Help: Uniform linear density

  1. Feb 6, 2009 #1
    1. The problem statement, all variables and given/known data
    A long line carrying a uniform linear charge density + 50.0*10^-6C/m runs parallel to and 10.0 cm from the surface of a large, flat plastic sheet that has a uniform surface charge density of - 100*10^-6C/m^2

    Find the location of all points where an alpha particle would feel no force due to this arrangement of charged objects.
    L= ???? m from the line

    Are they above the line or between the line and the sheet?

    2. Relevant equations

    3. The attempt at a solution
    I have no idea where to start. please help
  2. jcsd
  3. Feb 6, 2009 #2
    Do you know anything about electric force? And how charge density is related to the total charge?

    Basically, what have you covered concerning electricity so far?
  4. Feb 6, 2009 #3
    electric flux for uniform electric field and nonuniform electric field. we are begging to discuss gauss's law and guassian surfaces
  5. Feb 9, 2009 #4
    i need help!?!?!?
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