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Homework Help: Voltage potential due to 2 charges

  1. Feb 1, 2007 #1
    1. The problem statement, all variables and given/known data
    Find the potential at points a and b in the diagram for charges Q1 = +1.60 nC and Q2 = -1.60 nC.

    I know b is 0
    physics.gif


    2. Relevant equations

    V = kQ/r

    3. The attempt at a solution

    I tried this using the equation and got

    8.99e9 * [( +1.60e-6 / .05) + ( -1.60e-6 / .15 ) ] = 191700 V but this isn't right any suggestions??
     
  2. jcsd
  3. Feb 1, 2007 #2

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    If its nancoulombs as the question suggests then you've just made a numerical error in the solution. Nano = x10-9
     
  4. Feb 1, 2007 #3
    Wow how'd I miss that thanks!
     
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