PHY2054 - Fall 2009 Final

PHY2054 - Fall 2009 Final - 77777 PHY 2054 Name (print,...

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77777 PHYSICS DEPARTMENT PHY 2054 Final Exam December 12, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet and UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. (6) Hand in the answer sheet separately. Constants g = 9 . 80 m/s 2 e = 1 . 6 × 10 - 19 C 1 μ C = 10 - 6 C G = 6 . 67 × 10 - 11 Nm 2 /kg 2 m e = 9 . 11 × 10 - 31 kg 1 nC = 10 - 9 C k E = 8 . 99 × 10 9 Nm 2 /C 2 m p = m n = 1 . 67 × 10 - 27 kg 1 pC = 10 - 12 C ² 0 = 8 . 85 × 10 - 12 C 2 /N/m 2 μ 0 = 4 π × 10 - 7 Tm/A 1 eV = 1 . 6 × 10 - 19 J c = 3 × 10 8 m/s 1. A single-turn square coil, 25 cm on a side and weighing 37 g, lies flat on a bench. Only one side of the coil is exposed to a uniform, horizontal magnetic field of 75 mT, as indicated by arrows in the figure. In order to lift that side, what is the minimum current that must be fed to the coil [in A]? Ignore the mass of the very flexible wires (not shown) that carry the current to the coil. (1) 9.7 (2) 4.2 (3) 1.2 (4) 0.54 (5) 21 2. A single-turn square coil, 40 cm on a side and weighing 26 g, lies flat on a bench. Only one side of the coil is exposed to a uniform, horizontal magnetic field of 75 mT, as indicated by arrows in the figure. In order to lift that side, what is the minimum current that must be fed to the coil [in A]? Ignore the mass of the very flexible wires (not shown) that carry the current to the coil. (1) 4.2 (2) 9.7 (3) 1.2 (4) 0.54 (5) 21 3. A single-turn square coil, 15 cm on a side and weighing 2.7 g, lies flat on a bench. Only one side of the coil is exposed to a uniform, horizontal magnetic field of 75 mT, as indicated by arrows in the figure. In order to lift that side, what is the minimum current that must be fed to the coil [in A]? Ignore the mass of the very flexible wires (not shown) that carry the current to the coil. (1) 1.2 (2) 9.7 (3) 4.2 (4) 0.54 (5) 21 4. A solenoid, made of three hundred turns of insulated copper wire, and a 200-Ω resistor form a closed circuit as schematically shown in the figure. The radius of the solenoid is 10.0 cm. As the magnetic field applied along the solenoid axis changes from 0.500 T in one direction to 0.500 T in the other direction, find the total charge that flows through the resistor. (1) 47.1 mC
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This note was uploaded on 03/15/2010 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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PHY2054 - Fall 2009 Final - 77777 PHY 2054 Name (print,...

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