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Simple electric field strength problem

  1. Apr 30, 2014 #1
    1. The problem statement, all variables and given/known data

    How far away from a 360μC charged particle is the electric field strength 49mN/C?

    2. Relevant equations
    E=(8.99x10[itex]^{9}[/itex] x [itex]\frac{Q}{r^{2}}[/itex]

    3. The attempt at a solution
    I assumed it would be a simple case of rearranging the equation to give r=[itex]\sqrt{\frac{8.99x10^{9}xQ}{E}}[/itex] but after doing this and subbing in the values I got a value of 8127, which is clearly not correct. The answer that has been given is 186mm but I can't see the solution.
  2. jcsd
  3. Apr 30, 2014 #2
    Could it be a case of the answer given is not correct?
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