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Potential Due to a Group of Point Charges

  1. Sep 23, 2009 #1
    1. The problem statement, all variables and given/known data

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    2. Relevant equations

    ipw1ut.png

    3. The attempt at a solution

    First time: I got -1.468e-19 which is wrong.
    Second time: I got -6.407e-19 which is wrong.

    q1 = 3.337e-19 ???
     
  2. jcsd
  3. Sep 23, 2009 #2

    lanedance

    User Avatar
    Homework Helper

    can't quite follow your working, here's how I would look at it:

    q1 is located at distance d from the origin

    The graph gives the potential at the origin, as q2 charge is moved a distance x away from the origin.

    Unknowns:
    q1
    q2

    when the 2nd charge is at infinity, the potential at the origin, V, will be only due to q1, use this to calculate q1 in terms of V & d.

    Then pick a suitable point from you graph, the zero crossing, x = 8, seems the easiest to me,

    you know q1 is d from the origin & q2 is x from the origin, and the net potential is zero, us these facts to calculate q2.
     
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