Where can a third charge be placed so that it experiences no net force?

Paul

New member
A 5.19 microC and a -2.94 microC charge are placed 18.1 cm apart.
Where can a third charge be placed so that it experiences no net force? [Hint: Assume that the negative charge is 18.1 cm to the right of the positive charge.]

I have experimented with Coulomb's law, but I am unable to figure it out. It needs to be in cm to the right of the negative charge.
 
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