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 $$\frac{X_0}{X_1} = 3,$$ the value of $$\frac{R_1}{R_2}$$ is