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Point Charges

  1. Mar 15, 2008 #1


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    1. The problem statement, all variables and given/known data
    q1 (-6.5E-7 C) @ 6 cm to the right of origin (X,Y coordinate is 6,0)
    q2 (6.5E-7 C) @ 21 cm to the left of origin (X,Y coordinate is -21,0)

    At the half-way point of these two charges, what is the E field value...?

    2. Relevant equations
    sum of electric fields
    electric field at point is equal to constant times the charge, all divided by radius squared
    constant is 8.99E9 Nmm/(CC)

    3. The attempt at a solution
    I found the two E's from the point to the half-way mark...I'm suppose to add the two E's because it's going from negative to positive...right? Well...I got it wrong...
  2. jcsd
  3. Mar 15, 2008 #2


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    What did you use for the distance when you calculated the E field?
  4. Mar 16, 2008 #3


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    Rather dumb question to ask...but I used .135 m as R.
  5. Mar 16, 2008 #4


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    Homework Helper

    It is not a dumb question at all. You didn't show your work. How can we tell you what you did wrong if you don't show any calculations?
  6. Mar 16, 2008 #5


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    well, if it's a dumb question to ask I won't ask any question anymore.

    Best luck
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