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Electric charge and force question

  1. Feb 13, 2016 #1
    1. The problem statement, all variables and given/known data
    q1 = 25 μC at (0,1) and q2 = 20 μC find a.) q3 if q1 is in the negative x direction

    2. Relevant equations
    E=kq1q2/r^2

    3. The attempt at a solution
    I keep trying to add vectors to find q3 ie ( -(25 μC) + 20 μC) and get 5 μC the book answer says 20 μC
     
  2. jcsd
  3. Feb 13, 2016 #2
    the force on q1 points in the -x direction
     
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