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Unformatted text preview: Sample Test for Chapters 30, 31, and 32 (This is intended to show problems of the multiple choice variety. For problems of the "essay" type, please review your problem sets.) 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) The figure shows a uniform magnetic field that is normal to the plane of a conducting loop, which has a resistance R. Which one of the following changes will cause an induced current to flow through the resistor? (a) decreasing the area of the loop (b) decreasing the magnitude of the magnetic field (c) increasing the magnitude of the magnetic field (d) rotating the loop through 90 about an axis in the plane of the paper (e) all of the above 3) A 0.50-T magnetic field is directed perpendicular to the plane of a circular loop of radius 0.25 m. What is the magnitude of the magnetic flux through the loop? (a) 0.049 Wb (c) 0.20 Wb (e) zero Wb (b) 0.098 Wb (d) 0.39 Wb x x x x x x x x x x x x x x x x x x x x R 4) A circular copper loop is placed perpendicular to a uniform magnetic field of 0.50 T. Due to external forces, the area of the loop decreases at a rate of 1.26 10 3 m 2 /s. Determine the induced emf in the loop. (a) 3.1 10 4 V (c) 1.2 10 3 V (e) 3.1 V (b) 6.3 10 4 V (d) 7.9 10 3 V 5) The area of a 333-turn conducting coil is 7.85 10 3 m 2 . The resistance of the coil is 10.4 . If the coil is oriented as shown in a magnetic field B , at what rate in T/s should the magnitude of B change to induce a current of 2.50 10 3 A in the coil? (a) 0.0155 T/s (c) 0.228 T/s (e) 1.52 T/s (b) 0.0996 T/s (d) 0.757 T/s 6) The figure shows a uniform, 3.0-T magnetic field that is normal to the plane of a conducting, circular loop with a resistance of 1.5 and a radius of 0.024 m. The magnetic field is directed out of the paper as shown. Note : The area of the non-circular portion of the wire is considered...
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- Spring '11