Physics126.Exam2b - 1. A conducting loop of wire is placed...

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1. A conducting loop of wire is placed in a magnetic field that is normal to the plane of the loop. Which one of the following actions will not result in an induced current in the loop? A) Rotate the loop about an axis that is parallel to the field and passes through the center of the loop. B) Increase the strength of the magnetic field. C) Decrease the area of the loop. D) Decrease the strength of the magnetic field. E) Rotate the loop about an axis that is perpendicular to the field and passes through the center of the loop. 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 dimensions of the loop are height h= 0.5 m and length l=1 m. Determine the induced emf in the loop. A) 0.25 V B) 0.5 V C) 1 V D) 2 V E) 0 V 3. A conducting loop has an area of 0.065 m 2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop. When the magnitude of the magnetic field decreases to 0.30 T in 0.087 s, the average induced emf in the loop is 1.2 V. What is the initial value of the magnetic field? A) 0.42 T B) 0.75 T C) 0.87 T D) 1.2 T E) 1.9 T Page 1
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4. A long, straight wire is in the same plane as a rectangular, conducting loop. The wire carries a constant current I as shown in the figure. Which one of the following statements is true if the wire is suddenly moved toward the loop? A) There will be no induced emf and no induced current. B) There will be an induced emf, but no induced current. C) There will be an induced current that is clockwise around the loop. D) There will be an induced current that is counterclockwise around the loop. E) There will be an induced electric field that is clockwise around the loop.
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This test prep was uploaded on 04/06/2008 for the course PHYSICS 126 taught by Professor Amidei during the Winter '08 term at University of Michigan.

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Physics126.Exam2b - 1. A conducting loop of wire is placed...

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