Question 1:

B. A metal rod slides at a constant 55 m/s over frictionless rails separated by 30 cm, as shown in the figure above. A 0.7 T uniform magnetic field is directed out of the page. Assume the resistance of the rod is 2.40 and that the rails have negligible resistance. Find: a) the current flowing in the rails; A counterclockwise b) the magnetic force acting on the rod; IN to the right c) the mechanical power needed to keep the rod moving at constant speed; w d) the electrical power dissipated. WR A metal rod of length = 10 cm moves at constant speed v on rails of negligible resistance that terminate in a resistor R = 0.60, as shown in the figure above. A uniform and constant magnetic field B = 0.95 T is normal to the plane of the rails. The induced current is I = 4 A and flows in the direction shown. Find: a) the speed v; Jm/s b) the external force needed to keep the rod moving at v. N to the right