Answered

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Answer:

.00000005 C       or     50 x 10^-9 C

Explanation:

Like charges   REPEL

k = 8.99 x 10^9   kg m^3 / s^2 C^2    ( they should have given units of this)

F = k q1q2/r^2      q1 = q2   so

F = k q^2 / r^2

9 x 10^-3    = 8.99 x 10^9  * q^2 /.05^2            (.05 m = 5cm)

q = .00000005 C

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