1) The simple linear de machine, shown in Fig. 1, has a supply voltage of 12 V, effective bar length of 1.25 m, equivalent circuit resistance of 0.1 Q2, and uniform magnetic field density B = 0.8 T directed into the page. The viscous friction force between the moving bar and rails varies linearly with the bar speed, and the viscous friction coefficient is 0.1 N.s/m. a) Find the no-load steady-state speed of the moving bar. b) Starting from the steady-state no-load conditions, suppose a mechanical load is attached to the moving bar. Find the bar's steady-state speed and machine efficiency when the load receives 175 W. c) Starting from the steady-state no-load conditions, suppose that an external force of 12.5 N to the right is applied to the bar. Find the bar's steady-state speed and machine efficiency. 12 V t=0 0.1 Fig. 1 B=0.8 T into the page 1.25 m