In Fig. 27.39, take l = 10 cm, B = 0.50 T, R = 4.0 ?, and v = 2.0 m/s. Find(a) the current in the resistor,(b) the magnetic force on the bar,(c) the power dissipation in the resistor, and(d) the mechanical power supplied by the agent pulling the bar. Compare your answers to parts (c) and (d).

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В х хх х_х x x x X x x X .R FIGURE 27.39 Problems 46-49 and 75