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Homework Help: Coulombs law problem

  1. Feb 20, 2007 #1
    1. The problem statement, all variables and given/known data

    A charge of -4.1 microC is located at the origin and a charge of -2.98microC is located along the y axis at 2.11519 m.
    The value of the Coulomb constant is 8.99x10^0.
    At what point along the y-axis is the electric field zero? Answer in units of meters.



    2. Relevant equations

    E= F/q

    F=kQq/r^2

    3. The attempt at a solution

    kq/x^2 = Q/(2.11519-x)^2

    using this, and doing the math i got 1886 something...very incorrect.. Please help:confused:
     
  2. jcsd
  3. Feb 20, 2007 #2
    1. Both charges produce an electric field.
    2. What will happen to a test charge placed at a position where the electric field is zero?
    3. You should first intuit where the field will be zero. I.E. is it along the negative y axis, between the charges, or past the second charge along the y axis.
    Hope that helps.
     
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