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Homework Help: Point charge problem

  1. Sep 11, 2009 #1
    1. The problem statement, all variables and given/known data

    Three identical point charges of 2.0x10-6C are placed on the x-axis. The firs charge is at the origin, the second to the right at x= 50cm, and the third is at 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?

    2. Relevant equations

    Coulombs Law physics-1.png

    3. The attempt at a solution

    I'm coming up with 0.36N to the right but I'm not sure if it's right.
  2. jcsd
  3. Sep 11, 2009 #2


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    Staff Emeritus
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    Gold Member

    I have something different. If you showed your working, perhaps we could point out where you've gone wrong.
  4. Sep 11, 2009 #3
    (9e9)(2.0e-6)(2.0e-6)/(.1)2 = 0.36 and since its positive it goes to the right
  5. Sep 11, 2009 #4
    well if they have the same charge they shouldn't be attracted to one another...
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