As shown in Fig. 32-5, a metal rod makes contact with two parallel wires and completes the

Question:

As shown in Fig. 32-5, a metal rod makes contact with two parallel wires and completes the circuit. The circuit is perpendicular to a magnetic field with B = 0.15 T. If the resistance is 3.0 Ω, how large a force is needed to move the rod to the right with a constant speed of 2.0 m/s? At what rate is energy dissipated in the resistor? X X B = 0.15 T (into page) x 50 cm x X X X X Fig. 32-5 X v=2.0 m/s