Magnetism

Two parallel wires in the plane of the paper are distance X₀ apart. A point charge is moving with speed u between the wires in the same plane at a distance X₁ 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 R₁. In contrast, if the currents I in the two wires have directions opposite to each other, the radius of curvature of the path is R₂. If \({{{X_0}} \over {{X_1}}} = 3\), and value of R₁/R₂ is