2. A 0.30-m-long metal bar is moving to the left at constant speed of 20 m/s perpendicular to a uniform 2.0 T magnetic field. The bar rides on parallel metal rails connected through a 6.0 0 resistor, so the apparatus makes a complete circuit, as shown in the figure below. Ignore the resistance of the bar and the rails. X X X X X X X X X X R. B X X X X X X X X b X a) Calculate the emf induced in the circuit. b) Calculate the current through the resistor and indicate its direction. c) Calculate the electric power dissipated in the resistor. d) Calculate the force needed to maintain the bar moving at constant speed of 20 m/s