Electrostatics: JEE Main 2023 Physics question

Two equal positive point charges are separated by a distance $2 a$. The distance of a point from the centre of the line joining two charges on the equatorial line (perpendicular bisector) at which force experienced by a test charge $\mathrm{q}_{0}$ becomes maximum is $\frac{a}{\sqrt{x}}$. The value of $x$ is __________.