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Working with electrostatic force - unknown charge problem

A positive charge of 2X10-12 Coulombs placed 10cm from another charge experiences a repulsive force of 9X10-9 Newtons. What is the sign and magnitude of the other charge?

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Since the charge experiences a repulsive force, the sign of the other charge is positive.
<br>(same charges repells)
<br>
<br>we have, F = AQ1q2/R^2 .....(1)
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<br>where A = 9x10^9
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<br>F = 9x10-9 N
<br>Q1= 2x10-12 C
<br>R = 10 cm = 10x10^-2m = ...

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