115Bwin08ex3verDsol - Name...

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Unformatted text preview: Name ___________________________________ Student ID ____________ Score_______ last first I. A. Series & Parallel Capacitors. C 3 30 F Four 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 maximum charge (after a long time) on C 3 ? C B 2 B 20 F 12 V C 1 20 F C 4 40 F 60 C 90 C 180 C 206 C 360 C A B C D E 2. (4 pts) Which choice best represents the equivalent capacitance of this combination? 20 F 22 F 38 F 57 F 110 F A B C D E I. B. Magnetic Field Lines. Two long straight parallel wires carry equal currents into the page, , as shown. 9 3. (4 pts) Which choice best represents the magnetic field lines surrounding these wires? A. B. C. D. E. None of these is correct. 9 9 9 9 9 9 9 9 Physics 115B, Winter 08, Version D Exam 2, page 1 Name ___________________________________ Student ID ____________ Score_______ last first Z Y X II. RC Circuit. A 40 F capacitor is connected to a 9 . 0 V battery and three 100 resistors as shown. At the time illustrated in the diagram, points X, Y and Z label the ends of three wires that are disconnected, but the capacitor is charged to 50% of its maximum value. 4. (4 pts) In order to discharge the capacitor, an electrical connection should be made between which points? A. Connecting point X and point Y. B. Connecting point Z and point X. C. Connecting point Z and point Y. D. Connecting all three points to each other. E. None of these is correct, but a different connection is possible. 5. (4 pts) After a correct connection is made, which value best represents the time constant for discharging this capacitor? . 0 s 4 . 0 x 10-3 s 2 . 4 x 10-2 s 1 . 2 x 10-2 s 8 . 0 x 10-3 s A B C D E 6. (4 pts) After a proper charging connection is in place for a long time, which choice best represents the maximum magnitude of electric charge Q that could accumulate on either capacitor plate? 3 . 6 x 10-4 C 7 . 2 x 10-4 C 1 . 8 x 10-4 C 4 . 8 x 10-4 C Zero C A B C D E Physics 115B, Winter 08, Version D Exam 2, page 2 Name ___________________________________ Student ID ____________ Score_______ last first III. Magnetic Forces. A uniform magnetic field of strength B = 3 . 0 T points straight up out of the page throughout a large region of space as shown below. The labels N, E, W, and S represent horizontal compass directions. The following questions concern various objects that are inserted into this region of space....
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115Bwin08ex3verDsol - Name...

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