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I Two point charges exert a 7.5 N force on each other. What w

  1. Jan 23, 2017 #1
    My work:

    F = k (q1 * q2) / r^2

    F = 7.5 N / 3^2

    F = 0.8333

    This is the correct answer, but why is "k" not used? as in 8.988 x 10^9 n*m^2/C
  2. jcsd
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