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As shown in Fig. 3.1, a 1 . 00   m conducting rod in good contact with a frictionless conducting frame moves to the left with a constant speed 4 . 80   m s . The light bulb in the conducting frame has a resistance of 12 . 0   Ω . The entire system is immersed in a magnetic field of magnitude B → = 8 . 00 × 10 3   G which is inclined at 30° with respect to the frame as shown in Fig. 3.1. (a) Find the induced electromotive force on the circuit. (b) What is the direction and magnitude of magnetic force exerted on the rod? To maintain the rod’s constant speed 4 . 80   m s , an external force must be applied on the rod. (c) Determine the work done by the external force after the rod is moved to the left for 5 . 00 meters. If the conducting frame is closed by a fixed conducting rod (the turquoise rod in Fig. 3.2) with a resistance of 6 . 00   Ω to form a rectangular conducting rod as shown in Fig. 3.2, (d) what are the induced electric current through the light bulb and the one through the turquoise rod? (e) What is the direction and magnitude of magnetic force exerted on the rod? To maintain the rod’s constant speed 4 . 80   m s , an external force must be applied on the rod. (f) Determine the work done by the external force after the rod is moved to the left for 5 . 00 meters. (Note: 1   G = 10 – 4   T ) fig_q19_final.jpg

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