Two parallel wires in the plane of the paper are distance Xo apart. A point charge is moving with speed u between the wires in the same plane at a distance X 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. In contrast, if the currents I in the two wires have directions opposite to each other, the radius of curvature of the path is Xo R - is R R. If X = 3, the value of