Two parallel wires in the plane of the paper are distance X _ 0...

Two parallel wires in the plane of the paper are distance ${X}_{0}$ apart. A point charge is moving with speed u between the wires in the same plane at a distance ${X}_{1}$ from one of the wires. When the wires carry current of magnitude $I$ in the same direction, the radius of curvature of the path of the point charge is ${R}_{1}$ . In contrast, if the currents $I$ in the two wires have directions opposite to each other, the radius of curvature of the path is ${R}_{2}$ . If $\dfrac{{X}_{0}}{{X}_{1}} = 3$ , value of $\dfrac{{R}_{1}}{{R}_{2}}$ is