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Electric potential PRoblem , dont understand

  1. Sep 21, 2008 #1
    1. The problem statement, all variables and given/known data

    In the picture i attached, particles with charges q1 = +7e and q2 = -15e are fixed in place with a separation of d = 23.9 cm. With V = 0 at infinity, what are the finite (a) positive and (b) negative values of x (in cm) at which the net electric potential on the x axis is zero?



    I dont understand why for positive net electric potential is in the middle between them, and negative is to the left. Can someone explain this.
     

    Attached Files:

  2. jcsd
  3. Sep 21, 2008 #2

    Doc Al

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    Staff: Mentor

    For each of the three regions (x < 0, 0 < x < d, x > d), write an expression that describes the net potential as a function of position.

    What's the electric potential surrounding a point charge?
     
  4. Sep 21, 2008 #3
    How would i do that, my book doesnt require us to write functions. I dont know what the electric potential surround a point charge is
     
  5. Sep 21, 2008 #4

    Doc Al

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    Staff: Mentor

    By "function" I just mean a mathematical formula.
    There's no point in worrying about the potential from two charges until you understand how to find the potential from one charge. Look it up!
     
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