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Electric Potential Question

  1. Jun 22, 2011 #1
    1. The problem statement, all variables and given/known data
    So here is the problem:
    http://i.imgur.com/IlklC.png"

    I already know the answers but I can't figure out why it is the case. How do you know when the forces cancel out?


    2. Relevant equations



    3. The attempt at a solution

    The answers should be:
    a) 1,2
    b)None
    c) No
    d) yes
     
    Last edited by a moderator: Apr 26, 2017
  2. jcsd
  3. Jun 23, 2011 #2

    tiny-tim

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    Science Advisor
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    Hi Shaunzio! :wink:
    draw a forces diagram …

    assume there's a positive charge at the point, and draw two arrows to show the direction of the forces on it …

    if the arrows are in the same direction, then they can't cancel! :smile:
     
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