注：不含主觀題第1題Theelectrostaticforcebetweentwopositivepointchargesdoubles.Whichofthefollowingisthemostlikelyexplanationforthis?()AThemassofoneoftheparticlesdoubled.BThechargeonbothparticlesdoubled.CThechargeononeparticlewashalved.DThedistancebetweenthechargeswasdoubled.EThechargeononeparticlewasquadrupled,whiletheotherwashalved.正確答案：E第2題Two1kgsphereseachcarryachargeof1C.Comparedtotheelectrostaticforcebetweenthespheres,thegravitationalforcebetweenthemis()AmuchgreaterBaboutequalCmuchlessDmoredependentuponthedistanceEstrongerifthechargesarethesamesign,butweakerifthechargeshaveoppositesigns第3題Acharge+Qisfixedinpositionasasmallcharge+qisbroughtnearitandreleasedfromrest.Ofthegraphsshown,whichbestrepresentstheaccelerationaofthe+qchargeasafunctionofitsdistance

rfrom+Q?()ABCDE第1題Anobjectwithachargeof–2qfeelsaforceofFwhenputatapointPinanelectricfield.IntermsofFandq,thestrengthoftheelectricfieldatthispointis(

).AB

CDE2qF第2題PointAisadistanceLtotheleftofachargeQ.PointBisadistance3LtotheleftofpointA.IftheelectricfieldatpointAduetochargeQisE,whatistheelectricfieldatpointB?AE/16BE/9CE/3DEE3E第3題Atwhichpoint/pointsinthediagrambelow,whichshowstwopointchargesof+4qand–2q,cantheelectricfieldbeequaltozero?()

AABBCCDAandCETheelectricfieldisnotzeroatanypointHomework1.5Gausslaw第1題TheGaussiansurfaceaboveistheareaenclosedbythedottedline.ThenetfluxthroughtheGaussiansurfacedependsonwhichofthefollowingcharges?AAllfourBQ2andQ3CQ1andQ4DQ1andQ2EQ3andQ4第2題BasedonGauss'Law,whichofthefollowingaffectstheelectricfluxthroughaGaussiansurface?()AamagneticmonopoleenclosedbythesurfaceBamagneticdipoleoutsideofthesurfaceCastationaryelectricchargeenclosedbythesurfaceDastationaryelectricchargeoutsidethesurfaceEachargemovingwithaconstantvelocityoutsidethesurface第3題TheelectricfieldneareachofthefollowingchargedobjectscanbedeterminedeasilyusingGauss'LawEXCEPTAasphericalshellBasolidsphereCalong,solidcylinderDalong,hollowcylinderEanarc正確答案：EHomeworkElectricPotential第1題Thediagrambelowwhichshowstwochargesofmagnitudeqbutoppositesign.EacharelocatedadistancedfromtheoriginAofacoordinatesystem.Howmuchworkwouldittaketomovea+1CchargefrominfinitytopointA?()ABCDE第2題AchargeqexperiencesadisplacementwithinanelectricfieldfromPositionAtoB.ThechangeintheelectricalpotentialenergyisDU,andtheworkdonebytheelectricfieldduringthisdisplacementisW.ThechangeinelectricpotentialfromAtoBisequaltoAq/WBqWC–qWDDU/qE–DU/q第3題WhatisthepotentialduetoasphericalshellofchargeQandradiusRforr>R?ABCDE第4題Thenegativederivativeofelectricpotentialwithrespecttoradiusisequalto()AchargeBelectricforceCelectricfieldDcapacitanceEpotentialenergy第5題Thepotentialofanon-uniformcloudofchargeisgivenbyV(r)=Kr2,whereristhedistancefromthecenterofthecloud.Whatistheelectricfieldasafunctionofr?A?2KrB2KrCD?KrEHomeworkElectrostaticInduction第1題1)Asolidinsulatingsphereofradius5cmcarrieselectricchargeuniformlydistributedthroughoutitsvolume.Concentricwiththesphereisaconductingsphericalshellwithnonetchargeasshowninthefigure.Theinnerradiusoftheshellis10cm,andtheouterradiusis15cm.Nootherchargesarenearby.AmongthepointsA(atradius4cm),B(radius8cm),C(radius12cm),andD(radius16cm),whichpointhasthegreatestelectricfield?AABBCCDD第2題2)Alarge,metallic,sphericalshellhasnonetcharge.Itissupportedonaninsulatingstandandhasasmallholeatthetop.AsmalltackwithchargeQisloweredonasilkthreadthroughtheholeintotheinterioroftheshell.Whatisthechargeontheinnersurfaceoftheshell?AQBQ/2C0D-Q/2E-Q正確答案：E第3題3)Whatisthechargeontheoutersurfaceoftheshell?AQBQ/2C0D-Q/2E-QHomeworkCapacitors第1題1)Whathappenstothemagnitudeofthechargeoneachplateofacapacitorifthepotentialdifferencebetweentheconductorsisdoubled?AItbecomesfourtimeslarger.BItbecomestwotimeslarger.CItisunchanged.DItbecomesone-halfaslarge.EItbecomesone-fourthaslarge.第2題Aparallel-platecapacitorhascapacitanceC.Asecondparallel-platecapacitorhasplateswithtwicetheareaandhalftheseparation.ThecapacitanceofthissecondcapacitorismostnearlyAC/4BC/2CCD2CE4C正確答案：E第3題Abatteryisattachedtoseveraldifferentcapacitorsconnectedinparallel.Whichofthefollowingstatementsistrue?AAllcapacitorshavethesamecharge,andtheequivalentcapacitanceisgreaterthanthecapacitanceofanyofthecapacitorsinthegroup.BThecapacitorwiththelargestcapacitancecarriesthesmallestcharge.CThepotentialdifferenceacrosseachcapacitoristhesame,andtheequivalentcapacitanceisgreaterthananyofthecapacitorsinthegroup.DThecapacitorwiththesmallestcapacitancecarriesthelargestcharge.EThepotentialdifferencesacrossthecapacitorsarethesameonlyifthecapacitancesarethesame.第4題Aparallel-platecapacitorisconnectedtoabattery.Whathappenstothestoredenergyiftheplateseparationisdoubledwhilethecapacitorremainsconnectedtothebattery?AItremainsthesame.BItisdoubled.CItdecreasesbyafactorof2.DItdecreasesbyafactorof4.EItincreasesbyafactorof4.第5題A10μFcapacitorischargedtoapotentialdifferenceof200kVin20s.Whatistheaveragepowerdeliveredtothecapacitorinthistime?A100WB200WC10kWD20kWE40kWHomeworkMagneticforceoncharges第1題Achargedparticleistravelingthroughauniformmagneticfield.Whichofthefollowingstatementsaretrueofthemagneticfield?AItexertsaforceontheparticleparalleltothefield.BItexertsaforceontheparticlealongthedirectionofitsmotion.CItincreasesthekineticenergyoftheparticle.DItexertsaforcethatisperpendiculartothedirectionofmotion.第2題IfapositivelychargedparticleisplacedatpointP,theforceduetothemagneticfieldAincreaseswithincreasingchargeBisoppositethedirectionofthemagneticfieldCiszeroDisinthedirectionofthemagneticfieldEcausestheparticletoacceleratetotheright第3題Abeamofelectronsentersamagneticfield.Whichofthefollowingbestdescribestheirmotion?ATheycontinueinastraightline.BTheyarebenttowardMagneticNorth.CTheyexhibitcircularmotioninthecounterclockwisedirection.DTheyexhibitcircularmotionintheclockwisedirection.ENotenoughinformationisgiven.正確答案：EHomeworkMagneticfield第1題Athincopperrod1.00mlonghasamassof50.0g.Whatistheminimumcurrentintherodthatwouldallowittolevitateabovethegroundinamagneticfieldofmagnitude0.100T?A1.20AB2.40AC4.90AD9.80AEnoneofthoseanswersHomeworkBiot-SavartLaw第1題TheBiot-SavartLawisusedtoAdeterminetheelectricfieldcreatedbyindividualpointchargesBdeterminetheelectricfieldcreatedbyanelectriccurrentCdeterminethemagneticfieldcreatedbyindividualpointchargesDdeterminethemagneticfieldcreatedbyanelectriccurrentEdeterminetheforcefieldcreatedbyanelectriccurrent第2題Along,vertical,metallicwirecarriesdownwardelectriccurrent.Whatisthedirectionofthemagneticfielditcreatesatapoint2cmhorizontallyeastofthecenterofthewire?AsouthBnorthCeastDwestEup第3題WhatisthemagneticfieldduetoawireofinfinitelengthcarryingacurrentI,adistanceaawayfromthewire?ABCDE第4題Iftwocurrentcarryingwiresexertaforceof50Noneachother,whatforcewilltheyfeelifthedistancebetweenthemishalved?()A12.5NB25NC50ND100NE200NHomeworkAmpere'slaw第1題WhichofthefollowingisnotusedwhenapplyingAmpere'slaw?AalineintegralBadotproductCalengthdifferentialDmagneticfieldEasurfaceintegral正確答案：E第2題Along,straightwirecarriesacurrentI.Whichofthefollowingstatementsistrueregardingthemagneticfieldduetothewire?AThemagnitudeisproportionaltoI/r,andthedirectionisoutofthepageatP.BThemagnitudeisproportionaltoI/r^2,andthedirectionisoutofthepageatP.CThemagnitudeisproportionaltoI/r,andthedirectionisintothepageatP.DThemagnitudeisproportionaltoI/r^2,andthedirectionisintothepageatP.EThemagnitudeisproportionaltoI,butdoesnotdependonr第3題Twowirescarrycurrentinthesamedirection.Thewiresare10cmapart.Theupperwirecarriesacurrentof6Aandthelowerwirecarriesacurrentof4A.Whereisthemagenticfieldequaltozero?A4cmbelowthebottomwireB6cmbelowthebottomwireC4cmbelowtheupperwireD6cmbelowtheupperwireHomeworkFaraday'sLawofInduction第1題Inthediagram,twoloopsofwireareshown.Oneisfixedalongthex-axis,andcarriesacurrentI.Theotherisinitiallyintheyz-planewithitscenterattheorigin.WhichofthefollowingmotionswouldNOTinduceemfinthissecondloop?ATranslationalongthex-axisBRotationaboutthex-axisCTranslationalongthey-axisDRotationaboutthey-axisERotationaboutthez-axis第2題Lenz'sLawindicateswhichofthefollowing?ATherearenomagneticmonopoles.BTheinducedEMFisequaltothechangeinmagneticflux.CTheinducedEMFproducesamagneticfieldthatopposesthechangethatproducedtheEMF.DTheforceexertedbyamagneticfieldisperpendiculartoboththemotionofthechargedparticleandthedirectionofthemagneticfield.ELightincidentonaconcavemirrorproducesavirtualimage.第3題AmetalrodwithlengthLispushedalongasetofconductingrailsthatcompletesacircuitwithatotalresistanceRataconstantvelocityvtotheright.ThecircuitisinamagneticfieldBthatpointsoutofthepage.Whatisthecurrentinducedinthecircuit?

ARBLvclockwiseBBLv/RcounterclockwiseCBLv/RclockwiseDBLv/RcounterclockwiseEBLv/Rclockwise第4題Abarmagnetisheldinaverticalorientationabovealoopofwirethatliesinthehorizontalplaneasshowninthefigure.Thesouthendofthemagnetistowardtheloop.Afterthemagnetisdropped,whatistrueoftheinducedcurrentintheloopasviewedfromabove?AItisclockwiseasthemagnetfallstowardtheloop.BItiscounterclockwiseasthemagnetfallstowardtheloop.CItisclockwiseafterthemagnethasmovedthroughtheloopandmovesawayfromit.DItisalwaysclockwise.EItisfirstcounterclockwiseasthemagnetapproachestheloopandthenclockwiseafterithaspassedthroughtheloop.HomeworkElectromagneticInduction第1題Initially,aninductorwithnoresistancecarriesaconstantcurrent.Thenthecurrentisbroughttoanewconstantvaluetwiceaslarge.Afterthischange,whenthecurrentisconstantatitshighervalue,whathashappenedtotheemfintheinductor?AItislargerthanbeforethechangebyafactorof4.BItislargerbyafactorof2.CIthasthesamenonzerovalue.DItcontinuestobezero.EIthasdecreased.第2題Mutuallyinductancebetweentwomagnetically-coupledcoilsdependson

Across-sectionalareaoftheircommoncoreBthenumberoftheirturnsCpermeabilityofthecoreDalloftheabove第3題Ifthecurrentinaninductorisdoubled,bywhatfactoristhestoredenergymultiplied?A4B2C1D1/2E1/4HomeworkSimpleHarmonicMotions第1題Thepositionofa0.64-kgmassundergoingsimpleharmonicmotionisgivenby.Whatisitspositionatt=5.0s?A0.160mB0.159mC0.113mD0.089mE0.076m第2題Ifanobjectofmassmattachedtoalightspringisreplacedbyoneofmass9m,thefrequencyofvibratingsystemchangesbywhatmultiplicationfactor?()A1/9B9.0C1/3D3.0E6.0第3題Whichofthefollowingstatementsaboutaspring-blockoscillatorinsimpleharmonicmotionaboutitsequilibriumpointisfalse?()AThedisplacementisdirectlyrelatedtotheacceleration.BTheaccelerationandvelocityvectorsalwayspointinthesamedirection.CTheaccelerationvectorisalwaystowardtheequilibriumpoint.DTheaccelerationanddisplacementvectorsalwayspointinoppositedirections.第4題0Hzandanamplitudeof8.0cm.Ifatimerisstartedwhenitsdisplacementisamaximum(hencex=8cmwhent=0),whatisthedisplacementofthemasswhent=3.7s?()AzeroB0.025mC0.036mD0.080mE0.095m第5題Anobject-springsystemmovingwithsimpleharmonicmotionhasanamplitudeA.whenitskineticenergyequalstwicethepotentialenergystoredinthespring,whatisthepositionxoftheobject?()AABA/3CD0EnoneoftheotheranswersHomeworkPendulum第1題Triplingthemassofthebobonasimplependulumwillcauseachangeinthefrequencyofthependulumswingbywhatfactor?

A0.33B1.0C3.0D9.0E12.0HomeworkSuperpositionofSHM第1題1)Youstandontheendofadivingboardandbouncetosetitintooscillation.youfindamaximumresponseintermsoftheamplitudeofoscillationoftheendtheboardwhenyoubounceatfrequencyf.Younowmovetothemiddleoftheboardandrepeattheexperiment.TheresonancefrequencyforforcedoscillationsatthispointwillAincreaseBdecreaseCthesameasfHomeworkSimpleHarmonicWaves第1題Whichofthefollowingcharacteristicofawaveisindependentoftheothers?AspeedBfrequencyCamplitudeDwavelength第2題Thedistancebetweentwosuccessivepeaksofasinusoidalwavetravelingalongastringis2m.Ifthefrequencyofthewaveis4Hz,whatisthespeedofthewave(inm/s)?A4B1C8D2第3題Assumeachangeatthesourceofsoundreducesthewavelengthofasoundwaveinairbyafactorof2.Whathappenstoitsspeed?AItincreasesbyafactorof4.BItincreasesbyafactorof2.CItdecreasesbyafactorof2DItisunchanged.第4題Awaveisrepresentedbytheequation,whichoneofthefollowingistrue

AFrequency=BAmplitude=0.001mmCMaximumVelocityoftheParticle60mm/secDwavevelocityis100m/s第5題Thedisplacementy(x,t)ofaparticulartravellingwavehastheformWhatisthespeedofthiswave,ignoringitsdirection?Aπ/2B2πC4D8πEnoneofotheranswersHomeworkInterferenceofwaves第1題Asourcevibratingatconstantfrequencygeneratesasinusoidalwaveonastringunderconstanttension.Ifthepowerdeliveredtothestringis

doubled,bywhatfactordoestheamplitudechange?A4B2CD0.707Ecannotbepredicted.第2題Assumetwoidenticalsinusoidalwavesaremovingthroughthesamemediuminthesamedirection.Underwhatconditionwilltheamplitudeoftheresultantwavebegreaterthaneitherofthetwooriginalwaves?()AonlyifthewaveshavenodifferenceinphaseBonlyifthephasedifferenceislessthan90°CinallcasesDonlyifthephasedifferenceislessthan120°Eonlyifthephasedifferenceislessthan180°第3題AwireisstretchedbetweentwofixedpointsseparatedbyadistanceL.Whatisthelongestwavelengththatastandingwavecanhaveonthiswire?ALB2LCL/2D0Enolimit第4題Astandingwaveissetupina200-cmstringfixedatbothends.Thestringvibratesin5distinctsegmentswhendrivenbya120-Hzsource.Whatisthewavelengthofthestandingwave?A10cmB20cmC40cmD80cmE100cmHomeworkDopplerEffect第1題InDopplereffect,changeinfrequencydependsonAdistancebetweensourceandlistenerBspeedsofsourceandlistenerCdensityofairDhalfofdistancebetweensourceandlistener第2題Asyoutraveldownthehighwayinyourcar,anambulanceapproachesyoufromtherearatahighspeedsoundingitssirenatafrequencyof500Hz.Whichstatementiscorrect?Ayouhearafrequencylessthan500Hz.Byouhearafrequencyequalto500Hz.Cyouhearafrequencygreaterthan500Hz.Dyouhearafrequencygreaterthan500Hzwhereastheambulancedriverhearsafrequencylowerthan500Hz.Eyouhearafrequencylowerthan500Hzwhereastheambulancedriverhearsafrequencygreaterthan500Hz.第3題Supposeanobserverandasourceofsoundarebothatrestrelativetothegroundandastrongwindisblowingawayfromthesourcetowardtheobserver.Whateffectdoesthewindhaveontheobservedfrequency?AItcausesadecrease.BItcausesanincrease.CItcausesnochange.HomeworkYoungsDoubleSlitInterference第1題Astheslitseparationincreases,whathappenstotheseparationbetweentheinterferencefringesonthescreen?AItincreases.BItdecreases.CItremainsthesame.DItmayincreaseordecrease,dependingonthewavelengthofthelight.EMoreinformationisrequired.第2題SupposeYoung’sdouble-slitexperimentisperformedinairusingredlight,andthentheapparatusisimmersedinwater.Whathappenstotheinterferencepatternonthescreen?AItdisappears.BThebrightanddarkfringesstayinthesamelocations,butthecontrastisreduced.CThebrightfringesareclosertogether.DThecolorshiftstowardblue.EThebrightfringesarefartherapart.第3題Whenlightpassesfromamaterialwithahighindexofrefractionintomaterialwithalowindexofrefraction:Anoneofthelightisreflected.Bsomelightisreflectedwithoutachangeofphase.Csomelightisreflectedwitha180°changeofphase.Dthelightthatisnotreflectedhasa180°changeofphase.HomeworkThin-filminterference第1題Incaseofthinfilmofnon-uniformthickness,whenilluminatedwithwhitelight,thefilmappearscolored.Thisisduetochangeofwhatfactor?AConditionsforpathdifferenceatdifferentpointsoffilmBChangeinopticalpathdifferenceatdifferentpointsoffilmCThicknessoffilmisdifferentatdifferentpointsoffilmDAllofotheranswers第2題Athinlayerofoil(n=1.25)isfloatingonwater(n=1.33).Whatistheminimumnonzerothicknessoftheoilintheregionthatstronglyreflectsgreenlight(λ=530nm)?A500nmB313nmC404nmD212nmE285nm第3題Interferencepatternisobservedinwedge-shapedfilmandfringewidthisnoted.Nowtheangleofwedgeisreduced.Whatwillbetheeffectonfringewidth?AFringewidthincreasesBFringewidthdecreasesCFringewidthwilldisappearDTherewillnotanyeffect第4題Lightisreflectingoffawedgeshapedthinpieceofglassproducingbrightanddarkinterferencefringes.Ifacertainlocationhasabrightfringe,anearbypointwillhaveadarkfringeifthethicknessoftheglassincreasesby:A1/8ofawavelengthofthelight.B1/4ofawavelengthofthelight.C1/2ofawavelengthofthelight.Donewavelengthofthelight.HomeworkNewtonsringandMichelsonInterferometer第1題TheRadius(ordiameter)ofdarkringsinNewtonsringsis()ADirectlyproportionaltothesquarerootofoddnumbersBInverselyproportionaltothesquarerootofnaturalnumbersCDirectlyproportionaltothesquarerootofevennumbersDDirectlyproportionaltothesquarerootofnaturalnumbers第2題Greenlighthasawavelengthof500nminair.ThegreenlightissentintoaMichelsoninterferometerthatisadjustedtoproduceacentralbrightcircle.Howfarmusttheinterferometer’smovingmirrorbeshiftedtochangethecenterofthepatternintoadarkcircle?()A1,000nmB500nmC250nmD125nmE62.5nmHomeworkdiffractions第1題Indiffractionpatternofmonochromaticligh