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Homework Help: Coulomb's Law and net electric field

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data

    Two point charges q1 = -5.60 nC, and q2 = -14.0 nC are separated by 25.0 cm (see figure below).

    http://www.webassign.net/yf12/21-p-031-alt.gif

    (a) Find the net electric field these charges produce at point A
    magnitude 10360 N/C
    direction is to the right

    (b) Find the net electric field these charges produce at point B.
    magnitude 6068.6 N/C
    direction is to the right

    (c) What would be the magnitude and direction of the electric force this combination of charges would produce on a proton at A?
    magnitude ______ N
    direction is to the right


    3. The attempt at a solution
    Okay well you can see that I figured out all of the answers except for the last magnitude, it seems to be really easy but I think Im just doing something little wrong, not sure.
    Can someone please help with what I have to do?
    Thank you!
     
  2. jcsd
  3. Jan 24, 2010 #2

    Redbelly98

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    There is a strong hint in the units of the electric field you calculated: Newtons per Coulomb.
     
  4. Jan 24, 2010 #3
    I'm still not quite sure where you're going with that. I tried a couple things but I ended with the wrong answer..
     
  5. Jan 24, 2010 #4

    Redbelly98

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    What did you try?
     
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