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Which way does the electric field go in this question?

  1. Jun 21, 2014 #1
    1. The problem statement, all variables and given/known data

    Find the electric field midway between a -3.0nC charge and a -5.0 nC charge that are separated by 0.60 m.

    2. Relevant equations

    ε= kq/r2

    3. The attempt at a solution

    net ε = ε1 + 2

    I drew my -3.0 charge on the left and my -5.0 charge on the right

    midway in between is 0.3 m

    they are both negative charges, so the fields lines are towards each charge (away from the centre) and the -5.0 charge has more lines, because it has the bigger charge

    so I solved for ε 1 and got -300 N/C
    I solved for ε 2 and got -500 N/C

    I think that ε 1 should be subtracted from ε 2 so the result is

    -200 N/C

    The field overall, I think should point toward the larger negative charge

    it should point toward the -5.0 nC charge, in my drawing, to the RIGHT.

    is that correct?

    Thanks!
     
    Last edited: Jun 21, 2014
  2. jcsd
  3. Jun 21, 2014 #2

    SammyS

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    Yes, the field at the midpoint, points toward the -5.0 nC charge.
     
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