Physics problem dealing with charges... help please?

flamegirl

New member
A charge q1 of −5.00×10−9 C and a charge q2
of −2.10×10−9 C are separated by a distance
of 41.0 cm.
Find the equilibrium position for a third
charge of +13.0 × 10−9 C by identifying its
distance from q1. Answer in units of cm.

I have no idea how to work this.
Any help would be great.

:)
 
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