In the figure below, the rolling axle, 2.30 m long, is pushed along horizontal rails at a constant speed v = 13.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.1100 T is vertically downward. (a) Find the magnitude of the induced current I in the resistor. (b) What horizontal force F is required to keep the axle rolling at constant speed?

In the figure below, the rolling axle, 2.30 m long, is pushed along horizontal rails at a constant speed v = 13.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.1100 T is vertically downward. (a) Find the magnitude of the induced current I in the resistor. (b) What horizontal force F is required to keep the axle rolling at constant speed?