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Ambiguous Electric-Field magnitude

  1. Feb 11, 2014 #1
    1. The problem statement, all variables and given/known data
    On the x axis, charge +Q lies at x = -a and charge -Q lies at x = +a. Point P lies on the axis at
    x = +b, where b > a. a) Work out the electric field magnitude of P b) What is the direction of this …field?

    2. Relevant equations
    E=kqr/r3

    3. The attempt at a solution
    E=2kQa/(b2-a2) + 2kQa/(b2-a2)=
    Ep=4kQab/(b^2 - a^2)^2. My teacher said that the solution was correct, however my work was not.
    For b, I determined the direction to be to the right towards the negative charge.

    I would appreciate any assistance.
     
  2. jcsd
  3. Feb 11, 2014 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    The equation in red does not make sense. What are a2, b2? Do you mean that the contribution is the same from both charges?

    ehild
     
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