Three particles are fixed on an \( x \) axis. Particle 1 of charge \( q_{1} \) is at \( x=-a \),...

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Three particles are fixed on an \( x \) axis. Particle 1 of charge \( q_{1} \) is at \( x=-a \), and particle 2 of charge \( q_{2} \) is at \( x=+a \). If their net electrostatic force on particle 3 of charge \( +Q \) is to be zero, what must be the ratio \( q_{1} / q_{2} \) when particle 3 is at \( x=+1.50 a ? \)
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