Ex1Ab - Name Student ID Number last first 123 Section A...

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Unformatted text preview: Name Student ID Number last first 123 Section A exam Write your name and student number on all four pages. Problem VI asks for a written answer—be concise yet complete, and write legibly. T 0 receive credit, you must briefly explain the major steps you take, “naked” answers receive none. Your job is to convince the grader that you know what you are doing. In answering multiple-choice questions, choose the best response. Problem I. Faraday’s Law [15 points] 50 m/s The conducting loop to the right is being pushed into a 0.20 T field at a speed of 50 m/s. The resistance of the loop is 0.10 9. 1. (5 pts) What is the direction of the induced emf in the loop? cw B. ccw C. can’t be determined D. reverses when loop is half way into field region E. depends on conductivity of loop. 2. (5 pts) What is the magnitude of the induced emf (in volts)? A. 0.00 1.00 C. 1.60 D. 0.50 E. 3.68 3. [(5 pts) What is the direction of the induced B-field exterior to the loop? A. cw B. ccw C. can’t be determined D. into the page @out of the page Problem II. Motional EMF [10 points] A rod of length 20 cm moves at 20.0 m/s through a 0.80 T magnetic field and produces a current flow through a 2.0 Q resistor, as shown. 4. (5 pts) What is the induced emf 8 (in V) in the circuit? A. 0.00 B. 0.98 C. 1.60 <D.>3.20 E. 3.68 5. (5 pts) What force magnitude (in N) is required to maintain the motion of the rod? A. 0.00 B. 0.038 C. 4.00 D. 0.128 @0256 Physics 123A, Winter 2009, Version b Exam 1, page 1 Name Student ID Number last first Problem III. RL Circuit Response [5 points] Battery 6. (5 pts) An open switch in the RL circuit shown above is closed at time t = 0. Which curve best illustrates the variation of the magnitude of the current, I, through the inductor with time? A. C. D. E. Problem IV. RC Circuit Response [15 points] Opens at f\= 0 S 40 Q In the circuit shown, the switch has been closed for a very long time, and is opened at PO. 7. (5 pts) What current (in A) is flowing through the 60 Q '00 V resistor before the switch is opened? A100 1.00 C.2.50 D.200 E. 325 8. (5 pts) What current (in A) is flowing through the 10 Q resistor before the switch is opened? A. 1.00 B. 2.0 C. 20.0 .00 E. 2.50 9. (5 pts) What is the charge on the capacitor (in 110 at t=0? Game 80.0 C. 0.080 D. 0.800 E. 325 . \\ 0W ¢o”\Mn~e at: at!“ GM”? L’l “was Problem V. Displacement Current [5 points] 6 5! MW “’1 0,41 5-5 There is a flow of conduction electrons though a resistor in series with an air-gap parallel—plate capacitor producing a current of 12 A through the resistor that is connected in series with an air- gap parallel plate capacitor. The plate area is 0.50 m2. 10. (5 pts) What is the displacement current L; (in A) between the capacitor plates? A. 0.0 B. 0.98 @120 D. 2.35 E. 10.0 Physics 123A, Winter 2009, Version b Exam 1, page 2 Name >_ H _7 W V, ' Student ID Number— !331 first Problem v1. Driven RI. (‘ircuit BID-points] u The scrim: R1. circuit on Lhc right is driven by a (10 H]. l 10%,.“ source. I. 21353101 11. R 10.0 s; and regall that the source current {a}: I. .“ .9 V. I :J _ .15 . . '¢ I = —-.. wzn-rr g'.’ = VR -- ..\_ In this (rm-e. me vow work. '1 I ’ X. - t l l I (5 p15) Driermim: lh: autagliludc m‘thc AC saurce voltage flu. whunr ‘ = L: --.in (r): Y}, _ a] f [12]“ = [g1slu2wt-L;:(é1i l1: =£~km5 go gogfiam=rixnov= 156V = :9 12. r. 5 pts) Determine 1er value 0141'; in ohms. XL - cu L. a (an so s") (2.537161% 4' ((3.01). Farm; eiuu‘a’; X,_ = R = man. I}. (5 pus} Show that the: impociruu-e- is JEN fur this Circuit. ?-=‘¢R1~+X:' rmiq- 2R1=GR I4. [5 phi) lklcm’nine the zunpkitudt': fifths source cumml In. Io“ 59-- "5—6" 1—HA % r5” ’0‘“- . 1 PH 15.. (5 p35) Shaw that 1113 average slower dissipated is 1’ - 8‘ 1;? Li ll 0” ,3 fl 1‘ ,. 8 E u ‘1. /\ 1*: H II an Iu\ 1 1 1. ax=lI1R:J so = £WLSR: [’0 Klan,“th Hal“- 1 ° {3 _a_1 gala 413‘ m. [5 p15) Cart-fully sketch an appnmimulc. but rcewonuhly accuratt. phasor diagram beimv displaying 5. F}. Hm I. and the phase dim-renew: (p , tween :7 and FE. Be certain to label all these Clements 111 your diagrmn. finally, cvuluuig 0- 0 flea u». 4> = #5 MVL Pfiysics 123A ‘Mnter 2009. Versian b Exam 1. page 3 ...
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Ex1Ab - Name Student ID Number last first 123 Section A...

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