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Unformatted text preview: mcconnell (kam2342) – oldmidterm 03 – Turner – (60230) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A copper strip (8 . 47 × 10 22 electrons per cu- bic centimeter) 1 cm wide and 0 . 04 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. The charge on the electron is 1 . 6 × 10 − 19 C. Find the magnitude of B when the current is 21 A and the Hall voltage is 1 μ V. Answer in units of T. 002 10.0 points A small rectangular coil composed of 48 turns of wire has an area of 36 cm 2 and carries a current of 1 A. When the plane of the coil makes an angle of 46 ◦ with a uniform magnetic field, the torque on the coil is 0 . 08 N m. What is the magnitude of the magnetic field? Answer in units of T. 003 10.0 points Given: Assume the bar and rails have neg- ligible resistance and friction. In the arrangement shown in the figure, the resistor is 8 Ω and a 6 T magnetic field is directed into the paper. The separation between the rails is 5 m . Neglect the mass of the bar. An applied force moves the bar to the left at a constant speed of 7 m / s . m ≪ 1g 7 m / s 8Ω 6 T 6 T I 5m At what rate is energy dissipated in the resistor? Answer in units of W. 004 10.0 points A coil is wrapped with 307 turns of wire on the perimeter of a circular frame (of radius 28 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is directed perpendicular to the plane of...
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This note was uploaded on 11/22/2010 for the course PHYS 303 taught by Professor Turner during the Spring '10 term at University of Texas.
- Spring '10