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Answer 1

.00000005 C or 50 x 10^-9 C

Step-by-step 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