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Electric field strength

  1. Jul 21, 2017 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2017-07-22 at 4.29.37 pm.png
    2. Relevant equations


    3. The attempt at a solution
    I tried to use the formula: F=kq1q2/r2
    So at point B, the electric field strength is( 2kQ/r2) - (-kQ/r2)= 3kQ/r2
    At A: (2kQ/r2)+(-kQ/r2)=kQ/r2
    At C: -(2kQ/r2)-(-kQ/r2)=-kQ/r2
    So B is the strongest?
    Is there an easier way to do it?
     
  2. jcsd
  3. Jul 22, 2017 #2

    haruspex

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    B is the only one where the two fields reinforce, so it is a good candidate. It could only lose to A or C if those were significantly closer to one of the charges.
     
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