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 $\frac{q_1}{q_2}$ when particle $3$ is at $(a)x=+0\mathrm{.}323$a and $(b)x=+2\mathrm{.}42a?$

$($a$)$ Number

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$($b$)$ Number

Units