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Homework Help: Electric fields caused by multiple charges

  1. Feb 4, 2009 #1
    1. The problem statement, all variables and given/known data
    A particle with charge +7.88 μC is placed at the fixed position x = 3.00 m in an electric field of uniform strength 300 N/C, directed in the positive x direction. Find the position on the x axis where the electric field strength of the resulting configuration is zero.

    2. Relevant equations
    E= K*Q / r^2

    3. The attempt at a solution
    I set up the equation with E = 0 but I'm not sure how you can solve it now for R since e = 0
  2. jcsd
  3. Feb 4, 2009 #2
    Find a value for r such that E becomes equal and opposite to 300N/C ie a point where the 2 fields cancel to zero.
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