115Awin08ex3verBsol - Name _Student ID _ Score_ last first...

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Name ___________________________________ Student ID ____________ Score_______ last first C 1 10 μ F C 2 20 μ F 12 V C 3 30 μ F I. A. Series & Parallel Capacitors. Three capacitors are connected to an ideal battery as shown. Each capacitor is initially uncharged, then the switch is closed. After a few seconds, the system reaches equilibrium. 1. (4 pts) Which choice best represents the equilibrium potential difference across C 2 ? 3 . 0 V 4 . 8 V 6 . 0 V 7 . 2 V 12 V A B C D E 2. (4 pts) Which choice best represents the equivalent capacitance of this combination? 60 μ F 28 μ F 22 μ F 13 μ F 8 . 3 μ F A B C D E I. B. Magnetic Field Lines 3. (4 pts) The Earth has a magnetic field similar to that of a bar magnet. Which choice best represents the N and S poles of the Earth’s magnetic field? A. B. C. D. N S N S N S N S E. None of these is even close to correct. Physics 115A, Winter 08, Version B Exam 2, page 1
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Name ___________________________________ Student ID ____________ Score_______ last first II. RC Circuit. A 44 μ F capacitor is connected to a 12 V battery, switch and four 80 Ω resistors. At the time illustrated in the diagram, the switch is open, but the capacitor has a charge Q equal to 50% of the maximum value that can be obtained with the switch X Y closed (in the correct position) for a long time. 4. (4 pts) This circuit can be used to fully charge or discharge the capacitor by placing the switch in the correct position. In which case is the time constant larger? A. The time constant is larger for discharging the capacitor. B. The time constant is larger for charging the capacitor. C. The time constant has the same non-zero value for both charging and discharging. D. The time constant is zero for both charging and discharging. E. More information is needed in order to compare values. 5. (4 pts) Which value best represents the time constant with the switch in position Y? 0 . 0 s 4 . 8 x 10 -3 s 8 . 8 x 10 -3 s 1 . 2 x 10 -2 s 1 . 6 x 10 -2 s A B C D E 6. (4 pts) Assume that the switch remains in position Y for a long time. Which choice best represents the final magnitude of potential difference across the capacitor? Zero V 4 . 5 V 4 . 9 V 6 . 0 V 12 V A B C D E Physics 115A, Winter 08, Version B Exam 2, page 2
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Name ___________________________________ Student ID ____________ Score_______ last first III. Magnetic Forces. A uniform magnetic field of strength B = 2 . 8 T points straight down throughout a large region of space as shown in the diagrams below. The labels “E” and “W” represent horizontal compass directions. South is out of the page and North is into the page. The following questions concern various objects that are inserted into this region. 7.
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This test prep was uploaded on 04/07/2008 for the course PHYS 115 taught by Professor Pedigo during the Winter '08 term at University of Washington.

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115Awin08ex3verBsol - Name _Student ID _ Score_ last first...

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