Physic II

Two like charges of the same magnitude are 8.0 mm apart. if the force of repulsion they exert upon each other is 4.0 N, what is the magnitude of each charge? (The constant of proportional for the Coulombic force is 9.0 x 10^9 N.m^2/C^2 )

Please show all work.

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asked by John

  1. F = k q^2/r^2

    so

    q = r sqrt (F/k)
    r = .008
    F = 4
    k = 9 * 10^9

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    posted by Damon

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