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What is the magnitude and direction of the electric field

  1. May 18, 2007 #1
    What is the magnitude and direction of the electric field at a point midway between a -7.0 µC and a +6.0 µC charge 2.5 cm apart? Assume no other charges are nearby.

    I thought I was approaching the problem correctly, but I'm not getting the right answer. I used the equation:
    E = k(Q1 + Q2)/L^2
     
  2. jcsd
  3. May 18, 2007 #2

    Dick

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    Hard to say what went wrong. What's L?
     
  4. May 18, 2007 #3
    L is 2.5 cm
     
  5. May 18, 2007 #4

    Dick

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    How far is the point midway between the charges from each charge? That's what should go into your E expression.
     
  6. May 18, 2007 #5
    drawin it all might help, as it always does =P
     
  7. May 18, 2007 #6

    hage567

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    Make sure all your units are consistent too.
     
  8. May 18, 2007 #7

    Dick

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    It's better than plugging numbers randomly into formulas just because they happen to be stated in the problem.
     
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