Question about electrostatic equilibrium?

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To achieve electrostatic equilibrium with the given charges, the third charge of 2.0 uC must be placed in a position where the net forces acting on it from the other two charges balance out to zero. The most promising location for this charge is between the two fixed charges, as this allows for the attractive and repulsive forces to potentially equalize. Using Coulomb's law, one can calculate the distances and forces involved to determine the exact position. The analysis should consider the magnitudes of the fixed charges and their separation distance. Ultimately, the precise placement will depend on the calculated forces acting on the 2.0 uC charge.
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Two fixed charges, 3.0 uC and 5.0 uC, are 0.40 m apart. The 3.0 uC is to the left of the 5.0 uC charge. Where should a third charge of 2.0 uC be placed to put the system of three charges in electrostatic equilibrium? The answer should be measured with respect to the 5.0 uC charge.

What equation do I use?
 
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Coulomb's law looks appropriate. Start by estimating where you think the third charge will have to go in order for the net force on it to balance out to zero. Hint: there are three choices of "region" that it might be placed: to the left of the two fixed charges, between the two fixed charges, and to the right of both fixed charges. Which region looks most promising?
 

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