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Where on the x-axis is the potential zero

  1. May 5, 2009 #1
    1. The problem statement, all variables and given/known data
    Is this question on electric potential solvable? Ive tried everything. any ideas?
    A charge of -1.9 × 10-9 C is at the origin and a charge of 9.4 × 10-9 C is on the x-axis at x = 3 m. At what two locations on the x-axis (xpositive, xnegative) is the potential zero?





    2. Relevant equations



    3. The attempt at a solution
    heres what i did...

    kq1/r1 = kq2/r2

    first i canceled k because its on both sides, and a constant..
    then i solved for r1...

    r1 = r2q1/q2

    then i added the values...

    r1 = 3(-1.9e-9) / (9.4e-9)

    answer = .606

    this is wrong... please help!!! thanks
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 5, 2009 #2
    Think about what your variables r1 and r2 mean here.
     
  4. May 5, 2009 #3
    r is the distance from the charge where the potential is zero isnt it?
     
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