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Net Electric field and electric net force

  1. Mar 9, 2014 #1
    1. The problem statement, all variables and given/known data
    well, I'm solving one question from 12U physics, and my answer don't match with others.

    the question is at attached file. I do not know how to put it in here


    Fex = 1.35, Fey = 1.35, and Fnet = 1.91 (45°)
    this one make sense, however on next one, which is

    "What is the net electric field acting on charge 1"

    I think using equation, Fe = qε, and q is 3 x 10-5,
    both εx and εy should be 1.35/(3 x 10-5)

    however the answer that I've match with this says

    Fex = εx and the marker says it is correct.

    how does people think I should solve this?

    2. Relevant equations
    Fe = kq1q2/r2 = qε

    ε=kq/r2
     

    Attached Files:

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  2. jcsd
  3. Mar 9, 2014 #2

    Simon Bridge

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    Charge 1, on your attachment, is 20μC .
    Thus the net electric field should be the net force (1.91N) divided by 2x10-5.
    Since the charge is positive, the field vector points the same way as the force.

    Doesn't make sense to me either.
     
  4. Mar 9, 2014 #3
    Thanks for the conformation
     
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