Physics 2212 Test 4 - Physics 2212 G/H Test form Name...

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Unformatted text preview: Physics 2212 G/H Test form Name ‘égggl Quiz 4 . Spring 2008 Instructions: » y ‘ seat: 1) Print your name, test form number (above) ,, and nine-digit Student number in the - section of the answer card labeled "STUDENT IDENTIFICATION". 2) Bubble your test form number in columns 1-3, skip column 4, then bubble in your student number in columns 5-13. 3) For each multiple-choice question, select the answer most nearly correct, circle this answer on your test, and bubble it in on your answer card. Show all relevant work on your quiz. 4) For each free-response question, be sure to show all relevant work supporting your final answer. “Correct” answers without adequate justification will receive a reduced score. 5) Turn in your test and answer card and leave. Be prepared to show valid photo ID. Scores will be posted under "Course Standing" as soon as possible. Quiz grades become final when the next quiz is given. 6) You may use a calculator that cannot store letters, but no other aids. 4k= 8.99x109N‘m2/C2 ’ ' ‘ uo=4n x10-7T-m/A ' 2 me =9.11x10’31 kg 80 = 8.85x10’12 Cz/N-mz ' e = 1.60x10-19 c mF = 1.67x10-27 kg Blank space — Feel free to use this space for scratch Standard Integrals: work. nd “n+1 C /u u=n+1+ (naé-l) fun du .—.~ lnlul + C (n == ——1) femur) do. = —cos(u) + C / cos(fu) du = sin.(u) + C /e“ den = e" + C fue"du==(u—1)e“+C page 1 of 7 461 T he following problem will be hand-graded. haw all 0 r work or this roblem. Make no marks and leave no space on your answer cardfor it. ' V ' ' [I] Consider the network of five resistors connected to an emf, as shown in the figure. (a) (8 points) Compute the equivalent resistance of the network, when, switch S is open. Express your answer in terms of the parameter R. . , 5 :— , (b) (8 points) Compute the equivalent resistance of the network, when switch S is closed. U:‘“'\ Sufi-‘4‘ c.3925, | M) (Mu/JP We“ QM WLQR ‘5 7+ 9&7} 49 rate __._____ {a >4) a.“ (we was weenie» m eMfi‘y Mails]: \ \ ‘ L 1| _L .L - .LQ. c. - 3 2-K 0Q ‘ :\“ 2% 2 ’R‘ +£§+‘Q+ ‘Q— ‘R =5 R%3 {'52 ~§e ..&;=fi+6%\\‘ .. .1 . U ,b quo ‘ x x (c) (8 points) Consider the shaded resistor in the diagram. Is the power dissipation in the resistor greater with the switch open, or with the switch closed? Support your work with calculations or qualitative arguments. W3» 5&1);on chad, .e LEAN! ”65ng .49 >P¢T§4g~$ ow “EH‘ m Sb Wi‘ {W M hbh‘h (RA! 0'9 Mi‘ W5 Mme, wm‘d‘ M‘fih '59 Mneoses . :9 Heater $39.th fife—’31:?R- Page 2 of 7 461 The following problem will be hand-graded. Show all your work tor this problem. Make no marks and leave no space on your answer card for it. [11] Two charged particles are moving in the plane of the page, as shown at right. ' (a) (8 points) What is the magnetic field due to charge A, at the location of charge B? (b) (8 points) What is the magnetic force on charge B, due to charge A? A 3:623; «B mm Tz,=3Vo(‘-J=,’§—ét mac-m) (c) , (4 points) In the diagram above, draw in and label the force and field vectors that you computed in par-ts (a) and (b).- (If necessary, use ® for a vectOr directed into the page and (9 for a vector directed out of the page.) ' Page 3 of 7 461 The following problem will be hand-graded. Show all your work tor this problem. Make no marks and leave no space on your answer card for it. [III] A very long straight wire is enclosed by a cylindrical metal shell of radius R; The wire conducts 'an- electrical currenth and a current Ic is flowing in the same direction along the shell, uniformly distributed around the circumference of the shell. (a) (8 points) Use Ampere’s Law to compute an expression for the magnitude of the magnetic field as a function of the distance r frOmthe central aXis, inside the metallic shell (i.e. for r < R). Dukeflgl M’ [69“ stdeo€WBw ‘W‘T , A to» m pats: 58-42: = $3}ch a BL,5 s = sum» "thl‘ \S‘l'k‘CMu‘R-Ilce. ’9' “Sims “dawn-i. “ =95 SCA-Qfl‘r‘: M911, '9 BCP) = £355: (b) (8 points) Use Ampere’s Law to'c'ompute an expression forthe' magnitude of the magnetic field as a function of the distance r from the central axis, outside the metallic shell (i.e. for r > R). £0“ loo? law “b“; IW‘»: +-Iw +1c (Lab Wad-9 0955 Plant ogwfdnm pdkfix‘rlae cage (imam) :5) co). 9% = Mo (3+1) :15 Page 4 of 7 461 Question value 5 points (1) Three ideal light bulbs are connected to a battery. Bulb A IS rated 100W at 120V, while Bulbs B and C are both rated 200W at 120V. What will happen to the brightness of Bulb A when the switch is closed? Assume that the emf is ideal. a Bulb A '11 remain the same. (b) Bulb A will grow brighter. (c) Bule Will grow dimmer; Far IQ! bailey 17M] ”SEW =0 (d) Bule will go out. . =5 9.339515 9C camel» AMA Mk, 5, uhmfim‘ Familial“) AV; = 2 =b VoH‘ge AVA (2ch b)“: A- =AVE 1M ._Cd°a'“3 ”‘4‘“ A95 “I." 41%.:an a La? =E Question value 5 points ' (2) Consider the same situation as .in the previous problem, but now assume that the emf 1s not ideal. What will happen to the brightness of Bulb A when the switch IS closed? ‘(a) Bule will grow dimmer. ! 1 Rd) x6' “'07 L16 7W I P I M‘kv‘I-w 2, P (b) Bulb A will grow brighter. (c) Bulb A will go out. " I ~— “5 .‘ om rimage]: £11.»; I Magi bdmhmwl M rs WK» you 493. wilck 1L MM amide ~.. ANwM CW4 12bit: Z—T—o WA Hmak 5k 100) a“ 11) AV: 1 (d) Bulb A will remain the same. Page 5 of 7 Question value 10points (3) Consider the RC circuit shown at right. . Assume that the switch has been closed for a very long time. Then, at time t = 0 the switch is re-opened. Which ,of the following expressions best describes the voltage across the resistor labeled (2), as a function of time? (a) AV2 =5[1— e-a—h‘v] note, [9”: wk“ amt \, QM; (b) AV2 2 E fag? ‘ AWN cm-‘ior C Lhclwues ML 99* RS cl‘ 2 = E (TR? W Ahiqe dNuT‘i-c. ‘ Q ‘9Uquiwasy ( ) Av (2) (wager) 11;“qu (d) AV2= (:)[1_ 6 3+5] t l AV‘=L-)1R%&Pclny (e) AV2 = (3;) [1— e-mév] [WWW 03.11 Ch) oeCc) m {with} N005 2.7;“sz it) LIP? a cm or (a) “Ctaoteahflx 9m Maw (W) C disdmyes :Htmda ‘l-Wo :fi‘s‘iors' - '22: [21-2)C 1QRC (WM: I W“’“"““‘ t’0 N“ =A‘kz "" Volta; amass bait) QN‘J‘A'W‘S m+ met” 993mg; . 4v 32w” Am3 am“: 3 “two Question value 5 points (4) A rectangular loop of wire is placed near a long E Q straight wire, as shown at right. The net magnetic force on the loop will be directed: (a) To the left 1n the plane of the page. Rm: “ LCFi‘L *QU'"+ 59‘; dc (b) There will be zero net force on the loop. low at: w 1246* we * (0) Down in the plane of the page. 74> w “9* ‘iv 2’? (d) To the right in the plane of the page. PM W w; WWfi’fi-L SM: indium 96W}: clmM‘lOf/ lighters Ts main-MAN» ’5 Nv'l‘fcm opt q 2 5m . ” E6of7 éhd-hl mm 4.» QM aw buM> 461 Question value 10 points . (5) Consider the three series circuit elements at right. Ammeter A indicates that a. 2.0-A current is flowing downward, while voltmeter V indicates that point B is 8‘volts higher than point C. ' - .— _. ....V At what rate is the capacitor storing energy? Assign value if the stored energy is- and a negative value if the stored energy IS decreasing. (a) —16.0J/s ‘5‘?“3 W ML 9" -——~8V (b) zero J/s You Mei 434mg % «53) - V — fwiwc) —8. 0 J/s“ (dwarf! Avaa— 33g, -Iev _ _ _ LAVC rally (d) +16.0 J/s‘i ESE—E W1. we: AV: +AVQ+AV =~8V 0-63“) (av) -—( rev) “W CTTwl‘es +9.9 out. ts a‘hkfifi \l («6 clam) anA boiling PHefscd‘lnul V(M5dm3¢‘) WWM?‘C§0I\ .5 PC :I HAV" :CQAXqV)="?W M‘sm C‘lecHoh‘fx Mw‘sfl ‘L‘W‘J up -, . _ “+X‘W. 2E§Mb{lwgwfld4¢w Question value 5 points ' ' (6) A bar magnet is brought near a stationary wire loop that carries a current I. What is the direction of the torque that will be exerted on the loop? (a) It tries to rotate wire B downward and wire F upward E HR {eh (”I am ., (b) There will be no torque on the loop With [0433 QMP& sir - ' L d d ' R d d. *(d) It tries to rotate w1re upwar an w1re ownwar Nigmfit'; AW Wt) kc) It tries to rotate wire L downward and wire R upward. ) ij—j ,u-= up ‘M Page 4mm ”3’ Am in a [New (c) It tries to rotate wire B upward and wire F downward. C ‘t «all 3‘ Wikmegm Page 70f7 ...
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