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Homework Help: Quick question

  1. Jul 12, 2007 #1
    For two point charges of the same charge (positive) that are placed a distance from each other "r", the electric field in the midpoint of r is zero.

    Now here's my question, what if one point charge had double the charge of the other? At what point between the two charges the electric field equal zero?

  2. jcsd
  3. Jul 12, 2007 #2
    You have to show some work before people will answer this question.

    What is the equation for an electric field of a point charge?
  4. Jul 12, 2007 #3
    My bad, I assumed that people would know.

    E = kQ/r

    where k is the constant of 9.0E9, Q is the charge of the point charge, and r is the distance from the point charge.
  5. Jul 12, 2007 #4
    I forgot the units, can you give me those too?

    What is the electric field of two point charges at a distance r?
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