AP physics C 真题 多项选择试题题目.docx
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AP physics C 真题 多项选择试题题目.docx
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APphysicsC真题多项选择试题题目
APphysicsC2004真题多项选择试题题目
Questions40-41
36.Three1/2μFcapacitorsareconnectedinseriesasshowninthediagramabove.The
capacitanceofthecombinationis(A)0.1μF(B)1μF(C)2/3μF(D)?
μF(E)1/6μF
37.Ahairdryerisratedas1200W,120V.Itseffectiveinternalresistanceis
(A)0.1Ω(B)Aparticleofcharge+eandmassmmoveswith10Ω(C)12Ωspeedvperpendiculartoauniformmagneticfield(D)120Ω(E)Bdirectedintothepage.Thepathoftheparticleis1440Ωacircleofradiusr,asshownabove.40.Whichofthefollowingcorrectlygivesthe
directionofmotionandtheequation
relatingvandr?
DirectionEquation
(A)ClockwiseeBr=mv2(B)ClockwiseeBr=mv38.Apointcharge+Qisinsideanuncharged(C)CounterclockwiseeBr=mvconductingsphericalshellthatinturnisnear2(D)CounterclockwiseeBr=mvseveralisolatedpointcharges,asshownabove.22(E)CounterclockwiseeBr=mvTheelectricfieldatpointPinsidetheshelldependsonthemagnitudeof41.Theperiodofrevolutionoftheparticle(A)Qonlyis(B)thechargedistributiononthesphereonly(A)mr/eB(B)meB/(C)Qandthechargedistributiononthesphere(D)allofthepointcharges(C)2πm/eB(D)2/,meB(E)allofthepointchargesandthecharge(E)2/,mreBdistributiononthesphere42.A20μFparallel-platecapacitorisfullychargedto3039.Inacertainregion,theelectricfieldalongV.Theenergystoredinthecapacitorismostnearlythex-axisisgivenby3-3-4(A)9x10J(B)9x10J(C)6x10J2E=ax+b,wherea=40V/m-4-7(D)2x10J(E)2x10Jandb=4V/m.Thepotentialdifferencebetweentheorigin43.ApotentialdifferenceVismaintainedbetweenandx=0.5mistwolarge,parallelconductingplates.An(A)-36V(B)-7V(C)-3V(D)10Velectronstartsfromrestonthesurfaceofone(E)16Vplateandacceleratestowardtheother.Itsspeedasitreachesthesecondplateis
proportionalto
(A)1/V
(B)
1V
V(C)
(D)V2(E)V
44.AwireofradiusRhasacurrentIuniformly48.Twoconductingcylindricalwiresaremadeout
distributedacrossitscross-sectionalarea.ofthesamematerial.WireXhastwicethe
Ampere'slawisusedwithaconcentriclengthandtwicethediameterofwireY.What
circularpathofradiusr,withr istheratioRxy calculatethemagnitudeofthemagnetic(A)1/4(B)? (C)1(D)2(E)4 fieldBatadistancerfromthecenterofthewire.Whichofthefollowingequations resultsfromacorrectapplicationof Ampere'slawtothissituation? 22(A)B(2πr)=μI(B)B(2πr)=μI(r/R)00 (C)B(2πr)=0(D)B(2πR)=μI(E)B(2πR)022=μI(r/R)0 Questions45-46 49.AsolidmetallicsphereofradiusRhascharge Quniformlydistributedonitsoutersurface.A graphofelectricpotentialVasafunctionof positionrisshownabove.Whichofthe followinggraphsbestrepresentsthemagnitude oftheelectricfieldEasafunctionofpositionrParticlesofchargeQand-4Qarelocatedontheforthissphere? x-axisasshowninthefigureabove.Assume theparticlesareisolatedfromallothercharges. 45.Whichofthefollowingdescribesthedirection oftheelectricfieldatpointP? (A)+x(B)+y(C)-y (D)Componentsinboththe-x-and +y-directions (E)Componentsinboththe +x-and-y-directions 46.Atwhichofthelabeledpointsonthex-axisistheelectricfieldzero? (A)A(B)B(C)C(D)D(E)E 47.WhentheswitchSisopeninthecircuit shownabove,thereadingontheammeterA is2.0A.Whentheswitchisclosed,the readingontheammeteris (A)doubled (B)increasedslightlybutnotdoubled (C)thesame (D)decreasedslightlybutnothalved(E)halved 50.Twoparallelwires,eachcarryingacurrentI,repeleachotherwithaforceF.Ifboth currentsaredoubled,theforceofrepulsionis(A)2F(B)F(C)4F22 (D)F(E)8F42 51.Acircularcurrent-carryingloopliessothattheplaneoftheloopisperpendiculartoaconstant54.AconductingloopofwirethatisinitiallymagneticfieldofstrengthB.SupposethatthearoundamagnetispulledawayfromtheradiusRoftheloopcouldbemadetoincreasemagnettotheright,asindicatedinthefigurewithtimetsothatR=at,whereaisaconstant.above,inducingacurrentintheloop.WhatisWhatisthemagnitudeoftheemfthatwouldbethedirectionoftheforceonthemagnetandgeneratedaroundtheloopasafunctionoft? 2thedirectionofthemagneticfieldatthe(A)2πBat(B)2πBat(C)2πBt223centeroftheloopduetothe(D)πBat(E)(π/3)Batinducedcurrent? Directionof MagneticFieldat DirectionofCenterofLoopdue ForceontheMagnettoInducedCurrent (A)TotherightTotheright (B)TotherightTotheleft (C)TotheleftTotheright52.Thefiguresaboveshowpartsoftwocircuits,(D)TotheleftTotheleft (E)Nodirection;Tothelefteachcontainingabatteryofemfεandinternaltheforceiszero.resistancer.Thecurrentineachbatteryis1A,butthedirectionofthecurrentinonebatteryisoppositetothatintheother.Ifthepotentialdifferencesacrossthebatteries'terminalsare10Vand20Vasshown,whatarethevalues ofεandr? 55.AsquareloopofwirecarryingacurrentIis(A)ε=5V,r=15Ωinitiallyintheplaneofthepageandislocated inauniformmagneticfieldBthatpoints(B)ε=IOV,r=100Ωtowardthebottomofthepage,asshownabove.(C)ε=15V,r=5ΩWhichofthefollowingshowsthecorrectinitial rotationoftheloopduetotheforceexertedon(D)ε=20V,r=10Ω itbythemagneticfield? (E)Thevaluescannotbecomputedunlessthecompletecircuitsareshown. 53.Achargedparticlecanmovewith constantvelocitythrougharegion containingbothanelectricfieldanda magneticfieldonlyifthe (A)electricfieldisparalleltothemagneticfield (B)electricfieldisperpendiculartothemagneticfield (C)electricfieldisparalleltothevelocityvector (D)magneticfieldisparalleltothevelocityvector (E)magneticfieldisperpendiculartothevelocityvector Questions59-61 56.Inthecircuitshownabove,theequivalentThediagramaboveshowsequipotentiallinesresistanceofthethreeresistorsis producedbyanunknownchargedistribution.A,(A)10.5Ω(B)15Ω(C)20Ω B,C,D,andEarepointsintheplane.(D)50Ω(E)115Ω 59.WhichvectorbelowbestdescribesthedirectionQuestions57-58 oftheelectricfieldatpointA? (A)(B)(C)(D) (E)Noneofthese;thefieldiszero. 60.Atwhichpointdoestheelectricfieldhave thegreatestmagnitude? (A)AAsshowninthefigureabove,sixparticles,each(B)Bwithcharge+Q,areheldfixedandateequally (C)Cspacedaroundthecircumferenceofacircleof (D)DradiusR. (E)E 57.Whatisthemagnitudeoftheresultant electricfieldatthecenterofthecircle? 61.Howmuchnetworkmustbedonebyan externalforcetomovea-1μCpointcharge6Q(A)0(B)(C)fromrestatpointCtorestatpointE? 24,,R0(A)-20μJ (B)-10μJ23Q32Q(D)22(C)10μJ,,,,4R4R00(D)20μJ3Q(E)30μJ(E)2,,2R0 58.Withthesixparticlesheldfixed,howmuch workwouldberequiredtobringaseventh particleofcharge+Qfromveryfaraway andplaceitatthecenterofthecircle? 23Q6Q(A)0(B)(C)2,,,,24RR00229Q3Q(D)(E),,,,2R00R 62.OneofMaxwell'sequationscanbewritten65.Aphysicsproblemstarts: "Asolidspherehas chargedistributeduniformlythroughout..."d,as.Thisequationexpresses,,,Eds,Itmaybecorrectlyconcludedthatthedt(A)electricfieldiszeroeverywhereinsidethethefactthatsphere(A)achangingmagneticfieldproduces(B)electricfieldinsidethesphereisthesameanelectricfieldastheelectricfieldoutside(B)achangingelectricfieldproducesa(C)electricpotentialonthesurfaceofthemagneticfieldsphereisnotconstant(C)thenetmagneticfluxthrougha(D)electricpotentialinthecenterofthesphereclosedsurfacedependsontheiszerocurrentinside(E)sphereisnotmadeofmetal(D)thenetelectricfluxthroughaclosedsurfacedependsonthechargeinsideQuestions66-67relatetothecircuitrepresented(E)electricchargeisconservedbelow.TheswitchS,afterbeingopenforalongtime,isthenclosed. , 12V4H S 63.Theplatesofaparallel-platecapacitorofcross66.WhatisthecurrentinthecircuitafterthesectionalareaAareseparatedbyadistanced,switchhasbeenclosedalongtime? asshownabove.Betweentheplatesisa(A)0AdielectricmaterialofconstantK.Theplatesare(B)1.2AconnectedinserieswithavariableresistanceR(C)2AandapowersupplyofpotentialdifferenceV.(D)3AThecapacitanceCofthiscapacitorwill(E)12Aincreaseifwhichofthefollowingisdecreased? (A)A(B)R(C)K67.Whatisthepotentialdifferenceacrossthe(D)d(E)Vresistorimmediatelyaftertheswitchisclosed? (A)0V (B)2V (C)7.2V (D)8V (E)12V 68.Auniformsphericalchargedistributionhas radiusR..Whichofthefollowingistrueoftheelectricfieldstrengthduetothischarge64.Thecurrentsinthreeparallelwires,X,Y,andZ,distributionatadistancerfromthecenterofeachhavemagnitudelandareinthedirectionsthecharge? shownabove.WireYisclosertowireXthanto(A)Itisgreatestwhenr=0.wireZ.ThemagneticforceonwireYis(B)Itisgreatestwhenr=R/2.(A)zero(B)intothepage(C)outofthepage(C)Itisdirectlyproportionaltorwhenr>(D)towardthebottomofthepageR.(E)towardtheleft(D)Itisdirectlyproportionaltorwhenr 6
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