Phys 1120 Sample Final Exam solution

Phys 1120 Sample Final Exam solution - PHYS “'20 Final...

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Unformatted text preview: PHYS “'20 Final Exam NAMlizéé __ '._ Student ll) 8 _ - _ , __ _ - __ _ Section number and TA Name:_ _ _ _ _ _ _ _ Exam Version 0001 Please do not omn the exam until you are asked to. 0 Your exam should have It) pages. numbered Ffil thru Fix. It). 0 This exam Cflnhlhls ot‘ 32 multiple choice questions. worth 5 points each. for .1 total of 160 points. PLEASE! l. Print your mum- on each page in the Space provided 2. Print your student identification Number on the page above. 3. Bubble your name. ii). and exam version number on the bubble sheet pmvided. -t. Wnte the tumeoimr TA neatly tn the. big blank wave at the bottom of the bubble sheer TA'x natives .ue Chum-t Bailey. Jeremy Rum-n. Craig Illifilt'. Daniel .ilt'Kiumm. am! l'mmgu-mr Yt' Er mailing; At the end of the exam. cheek that you have completed all the questions, By handing in this exam. you agree to the following statement: "( )n my honor. m a University of Colorado Student. I have neither given nor reeeiyed unauthorized assistance on this work" Signattttc 'm‘ i’uxsihly useful information: p“ = 4x10" T-m/A. baxte charge unit Hut :0 "' C. h. = a 85\ to '~‘ (mum-'1 m'd of light in wetting: km" tit/sec , ) Electrostatic u'vttzntitil ol_';_i point plunge whim-n to befirogt Int-mile slug!)qu \' l r) = k I . . - . . . (T lzleetnc ltt'lulélgfllludt; tmm a §urfuee charge dgnsLtL I: = 1; d}. ‘ - , ' flu, flu 'tjctte t_t_e_l_d magnitude iron] 3 lmtv straight was: R = —1 Good luck! Spring 3003 Hi. i Final Exam PHYS I [20 Final Exam NAME:_..8Q[MJW Circle the closest newer and Bubble in questions l-35 ON YOUR BUBBLE Sill-I 4 ! r 1 An eleeumnagnettc wave. A) has an mcillatmg magnetic field. B) has an oscillating electric field. C) hm a wavelength has a frequency. E) All of the above. 2. An electromagnetic wave: A.) has a frequency that changes when it cnten‘ a material 8) has wavelength that gets larger in materials. Ct has a wavelength that is unchanged in materials 2 travels at 3a l0” always. w one of these. The next two questlom refer to an electromagnetic wave traveling in vacuum with an electric field given by the follnwrng equation. where .\ is measured in meters and r is measured in seconds. st“) ~. 2.m'sin[6.2s( r —w3:)] r 3. 'l'hcwavelength ut' the wave is. C é'fl 1 21L (Milmm (8,028 m (Cmme tD)2.Uttm. 4. Thcspeed of the wave is (Alum ml.- 18) no" mlsec «Ct 1.39xto‘m/s (0)6.28 m/s 5. Visible green light with a wavelength of 550 nm in vacuum has a frequency of: (m 3x I0" Hz (8) 1.an to" ttz .4310“ m (D) [.83x to“ m (E) None oflhesc Min; 5;; 3 6. The index of refraction of any particular material is: A) the speed of llglll in the material divided by the speed of light in vacuum Bl a number always le<s than l7 Ct @3117 G)». speed or light in vacuum divided by the speed of light in the material 2) None of these. Spring 2008 FE: Final Exam PHYS l 120 Final Exam NAME: The next l_wg questions” refer to a com-9min: lens ol’ I.5 cm focal length. arranged as shown in “WWW: \1: ~~~Bg_g_ 7. The ohscrvcr sees an image of the bug that is: (Al inverted & rcnlinwned 8-. virtual C) im'cncd & virtual D) noninvcncd at real. 8. The. nunglnlicmim ls: \ K ‘ I ’ AHIS@Cn-qum 1.5 mm -gl_' A + 9—K. AI ’ ha "9“ .. 2L ’“‘ ‘3? ’3 ’ 9. A converging lens. of focal length It) cm produces a teal. invcncd Image at an imagc dist;ch 0f 30cm.Thcubjcculismnccix: \ ' J_ l _ 2— I‘ 10:“. 3; 30cm 0 d ‘ 30 d : 29,04 1 " (M a 2’ '2 (5-0" 10cm 10cm ‘L A) 30 cm 8) 20cm< L"! IS cm>Dl 10 cm Spring 2011:: [-15.3 Final mam PHYS l l2l) Final Exam NAME:__SOJ%&1___' 'l h: [omitting thm (mag. 'ons refer to this situation: light ttuvels tint-ugh Region I and is incident 0n .1 flat interface that separate. Regiun I from Region ll. 80th of the light is reflected and some is retracted interface . Rel racted Angle 91 | Region ll I tetruetion Reflected beam c — . - — — . - - . - - . . .- - 9 Angle nt normal to “‘4‘” interface Incident beam . Rem/f" W “@egton 1. the... SM n l peed of light is [inter than in Region ll speed of light i\ slower than in Region ll C) is the same as in Region ll. II. In Regionl. the angle of reflection is ’- - :2 . Al larger than the angle at incidence +0 V ‘6’ l smaller than the single nf inculence . ’ p «gun! to the angle of incidence 0‘: r (a If M‘- - a“ _ 0 ’5' l h c f ‘4/ II’. If m: l .33 and nu=l.7 and the angle of incidence is’ 37 degrees. In the named in the interface. the angle of rel'metinn is: A) 20.3 degrees 8) 37 degree degie» D) zem due to total internal reflection. gin Q t n gm 6 “I J: Jr 31’: Spnng 2008 FE: Final Exam PHYS 1 I20 Final Exam NAME:_,__4.S_0_IM___ The next 119 questions refer to the following diagram: A +IC charge ls located at the origin 0! the XY coordinate system. A -Z(" charge ls located at +3tn on the x-axb and another charge of 4-1“? is located at ~3m on the y-axis: I3. 'lhe magnitude of the 3/ component of the (7 ulomh force on the +l(‘ charge is: a «m txio".\' t8)2xl0"N icisito"o°t<. 3 film/0 ll)(3> l-l. 'lhe net totee on the +IC charge appmximalely points towards: 3 2‘ @Ut (Cl (0) IS. A lithium nucleus hm 3 protons. An eleetron orbitx the nucleus at .1 t . m. The magnitude ot the electric field at the pmition ot' the electron is: 1A) S75xl0" Wm (B) IISO Mt)" Vltt30 All)" Vlttt tD) 2300 till)" Vltn (lit None ofthcse E lb. A positive charge. «I, is placed between ————9 ‘ _ “ changed plates :t.\ shown in the tigute to the _______) tight. The charge starts at an initial position near the negative plate and is mined to at final “mm posttton by the positive pl.tte. Did the electric ( . . _ . _ . . . .. _ 0 potential energy. l'. loathe/decrease? Dtd the electric potentiul. V. increase/accrue." l'tnztl +q @dul V ineteased \th > O _—__) t l‘ and V ilee‘temed , (it U increased and V decreased i- > 0 D) L’ demented and V inert-used E) None of the above. Spnng 2003 HiS Final lixam PHYS “20 Final Exam NAME- l7. An ac voltage with peak voltage of 20\' is attached item.“ a It) Ohm Misti)! as shown. flu: average puwcr dixx‘iputcd is? 10 Ohms AHOWCHRW Dlzcw VL l t: -—-t?- Ru L L I8. A copper wire has. a resistivity of IO” Ohm-meters and a circular cross sectional area of 2x l0 ’ tn'. How long must the Mr: he to have a resistance of fiilfiififlmuhu C’tlm Aek: 2w!" : 0. l .9. Zx/O’ “1 l". A charge of 3C moves at a speed of IOOOntIs parallel to a nuignetic field of 21“. The magnetic force _ _ P——' un the particle Is: -—-" _ ""' .a- '. A; 2th: BlfikN @m it'ftpmsihlc to tell. F71” E 1‘ O 20. A point chart-e +Q IS at the origin as shown in the figure to the left. A spherical Gmm‘ian surface centered at the origin enclmes the charge iQ. So does a cubical surface centered at the origin and With edges parallel to the x. y. and z axes. Which Stutcmgm LG gmt: M the magnitude nf the electric field is the same at all points on the cuhc‘s surface 8) the electric flux through the spherical surface is in X @ electric flux through the cube surface equals " flux thmugh the spherical surface. 0) the magnitude of the elecuic field is different at different points on the spherical surface fQ— F.) None of the above Spring 2008 F1511 Final Exam PHYS l 120 Final Exam NAME: ‘ 3| . A parallel plate capacrtor C is attached to a battery of voltage V and is charged to a charge Q. With the battery attached. the. distance between the plates is reduced to half the original value and a dielectric sheet of dielectric constant of 3 is in . t tween the plates. The charge then becomes: A) no change in Q B‘) SQ (7) 0/6 D) Q! Q__ , eA Cgfa“ =9 3%”5?‘ 22. It a battery of 3V is used to charge a capacitance of C1-7lllin0faflld through it resistance of R=0.3 Ohms. then the time required for the voltage across the capacitor to reach 63‘} of the final voltage is: No.48 seconds Bill microsecond C ill seconds D)O.9sec @ microseetmds 2‘; -. Q13 9%; Wit) 2 £.lx/0-‘<y¢ The next me questions refer to the circuit below. which contains three batteries. Please. note carefully the polarities of the batteries A student chooses the directions of the cunean in the three resistors as shown. 23. Which of the following equations is a correct current equation. given the chem: of current ' ions"! A)“ .=l| B)l1+lt=li C)l\+l|=l_' D)N00¢0fm. 24. Which one of the following loop equations is correct? (Only one is correct. l A] V. + V1 - “RI + '}R\ =0 .-V_~ -l|R1'1:R: =0 Cl vi ‘0’ V: - “R; + “R; = 0 DI V V: ' I|Rt '0 I:R] =0 Spring 2008 FF..7 Final Exam PHYS l 120 Final Exam NAME:____30LJZML’J____ The following 1113 questions «for to the following circuit of lighlbulbs‘. 25. ' \ Initially closed. YOU look at the brightness. of the bulb». S is then opened. What happcm'.‘ lb A gets dimmer. 8) Bulb A gm brighter .‘b. With the switch 0pm. and the tcsistzmcc of all bulbs equal to It) Ohms. the total resistance of the Circuit i\; A) l5 Ohms 8'! 30 Ohms‘Qtfl Ohms D) 6.7 /—“ ,_ A5 Baéa-fi‘bz 3" 2’ “i l 1 Big *' 3. Aug. =4 C O . Zt‘» A B C 27. (‘unsidcr the thrcc situatwm shovm ahm'c. whcrc points A. B. C'. and I) lie near wncs that each carry the. sum: amount ot'currcm‘ l. tn the duct-Hum .thvn. Rank the points A. B. (‘. and D. m unlc: ol' Mutagmflc field nmgnimdc: AlABCD ADC ("lC'ABD DIBCDA ElDCBA Spnng fills Hill Final Exam PHYS l l20 Final Exam NAME- __ 28. A loop at wire is placed in a pctpcndtculnt unitunn l3- t'ield as shown. An clcctmnxnivc [01cc tEMFI Inc-smith in volts uppeats across the [0011‘ m it there is magnetic flux in the '00? -/ 8t onlyr if the loop moves ' mly if B is pcqtcndiculat to the loop 'thc flux through the. loop changes 29. The ends at the same Imp are connected togetth and thc magnetic field begins incmaxing at lT/sec. By Lenz‘s 14w. the induced curtcnt flowing in the loop flows: ( A) )mkwisv: B) counter-clock use (‘p the current is zero 1)) immssihlc to tell 0W5 “(ML 5 The next M questions refer to the p' . are shown below. An infinite sheet of metal of thickness 2d is centered on the XY origin. and has a curmut density. J. flowing draight out of the page. L. Yé—‘B _ _._T_ __ , l - 7 7d ~— - ‘7'" ‘— “' current densnty. J. 8(3012 : fly}: 30' out ol’thc page. mar . _._.e, B (@2117 . .. for le. the n ' -nctic field dm'ctinn is. AttotheRighl < Bttithclxtt t‘lintu the page D) out of the page litthclicldis 1cm. 3|. Alch the metal sheet i.e. {m YM‘I. the magnetic lick! magnitude is: At tk’Cll‘JSlng ptnpnflioml tu l/Y J“ Y int-tenses 3 ‘ weaning proportional to Y as Y inuetuics @ install as Y increases H ' B-fickl magnitude i\ 7cm Swing 2008 F139 Final Exam PHYS 1 I20 Final Exam NAME, QM _ 32. TM: solenoid inductors labeled 1 and 2 are made at the some type of mm and have Ilie same radius. Snlcuuid 2 l5 three time.» as long and has 3 limes the number of turns. so solenqu I Which of the two sulcnmds has a larger inducluncc'.’ m Solenoid l @aimd 2 C l they haw the same induelnncc D) not enough infomuzt'um - All L’Solw‘ifll- A”- —(—-—+( — x \W/ § Congratulations on completing PHYS 1120! 3,“ Have a great summer break! Spring 20m HE. l0 Final Hum ...
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Phys 1120 Sample Final Exam solution - PHYS “'20 Final...

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