Consider smooth parallel conducting fixed rails separated by a distance '$l$'. There exists uniform magnetic field ‘B’ perpendicular to the plane of the rails as shown in figure. Two conducting wires each of length '$l$'  and mass  $m$ are placed perpendicular to rails, so as to slide on parallel conducting rails. One of the wires is given a velocity $v_0$ parallel to the rails. Till steady state is achieved, loss in kinetic energy of the system is  $\frac{m{v}_0^2}{n}.$ Then find '$n$'?