Problem 3.251

Find the magnitude and direction of a force vector acting on a unit length of a thin wire, carrying a current \(I=8.0 \mathrm{~A}\), at a point \(O,\) if the wire is bent as shown in (a) Fig. 3.68a, with curvature radius \(R=10 \mathrm{~cm}\) (b) Fig. \(3.68 b,\) the distance between the long parallel segments of the wire being equal to \(l=20\) cm.