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Homework Help: Electric field at point p if p is on a bisector between two opposite charges

  1. Feb 15, 2009 #1
    1. The problem statement, all variables and given/known data
    Determine magnitude of the electric field at the point P. The two charges are separated by a distance of 2a. Point P is on the perpendicular bisector of the line joining the charges, a distance x from the midpoint between them. Express your answer in terms of Q, x, a, and k.

    2. Relevant equations

    3. The attempt at a solution
    Top e=((8.99x10^9)*Q)/(tan^-1(a/x))
    Bottom e=((8.99x10^9)*Q)/(tan^-1(a/x))

    I just don't know how to determine the magnitude, and express my answer in terms of the given variables...i do know that the answer is in terms of q
  2. jcsd
  3. Feb 16, 2009 #2


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    Science Advisor
    Homework Helper

    Hi zyphriss2! :smile:
    oooh … why so trigonmetric? :cry:

    just use Pythagoras! :smile:
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