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Electric Field Question

  1. Nov 30, 2008 #1
    1. The problem statement, all variables and given/known data
    Four charges are arranged on the corner of a square. At which points is the electric field equal to zero?

    Diagram:
    [​IMG]


    2. Relevant equations
    None


    3. The attempt at a solution
    I chose A and B because the charges are equal so therefore the electric field will be zero right inbetween them.
     
  2. jcsd
  3. Nov 30, 2008 #2

    LowlyPion

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    Certainly the x components of the fields are balanced at A & B, but what about the field in the y direction at A & B? Is it 0 at those points?
     
  4. Nov 30, 2008 #3
    Thanks for your help. I don't know about the y direction.
     
  5. Nov 30, 2008 #4

    LowlyPion

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    When you are at A what is the field from the far away negative charges? It would be non-zero wouldn't it?

    Likewise at point B for the positive charges.
     
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