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1. A conducting bar moves to the left at a constant speed v on two conducting rails joined at the left in a constant magnetic field B=0.5 T as shown. A current I is induced in the indicated direction. Which one of the following directions is that of the magnetic field? A) toward the right B) toward the left C) parallel to the long axis of the bar D) into the page E) out of the page 2. A conducting bar moves to the left at a constant speed v= 1 m/s on two conducting rails in a constant magnetic field B=0.5 T. The rails are joined at the left as shown. Originally the loop is h= 0.5 m high and l=1 m long. The current in the loop is I = 0.25 A. What is the loop's resistance? A) 0.25 Ohm B) 0.5 Ohm C) 1 Ohm D) 2 Ohm E) 5 Ohm Page 1 3. A metal ring is dropped from rest below a bar magnet that is fixed in position as suggested in the figure. An observer views the ring from below. Which one of the following statements concerning this situation is true? A) As the ring falls, an induced current will flow counterclockwise as viewed by the observer. B) As the ring falls, an induced current will flow clockwise as viewed by the observer. C) As the ring falls, there will be an induced magnetic field around the ring that appears counterclockwise as viewed by the observer. D) As the ring falls, there will be an induced magnetic field around the ring that appears clockwise as viewed by the observer. E) Since the magnet is stationary, there will be no induced current in the ring. 4. A circular coil has 100 turns and a radius of 0.1 m. The coil is used as an ac generator by rotating it in a 0.500 T magnetic field, as shown in the figure. At what angular speed should the coil be rotated so that the maximum emf is 314 V?... View Full Document

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