注：不含主觀題第1題單選題(1分)Lifewillnotbedifferentiftheelectronwerepositivelychargedandtheprotonwerenegativelycharged.A正確B錯(cuò)誤第2題單選題(1分)Aglassobjectispositivelychargedbyrubbingitwithasilkcloth.Therefore,thepositivechargeswerecreatedontheglassobjectintherubbingprocess.A正確B錯(cuò)誤第3題單選題(1分)Threeobjectsarebroughtclosetoeachother,twoatatime.WhenobjectsAandBarebroughttogether,theyrepel.WhenobjectsBandCarebroughttogether,theyalsorepel.Whichofthefollowingaretrue?AObjectsAandCpossesschargesofoppositesign.BAllthreeobjectspossesschargesofthesamesign.COneobjectisneutral.DAdditionalexperimentsmustbeperformedtodeterminethesignsofthecharges.第4題單選題(1分)Threeobjectsarebroughtclosetooneanother,twoatatime.WhenobjectsAandBarebroughttogether,theyattract.WhenobjectsBandCarebroughttogether,theyrepel.Whichofthefollowingarenecessarilytrue?AObjectsAandCpossesschargesofthesamesign.BObjectsAandCpossesschargesofoppositesign.CAllthreeobjectspossesschargesofthesamesign.DOneobjectisneutral.EAdditionalexperimentsmustbeperformedtodetermineinformationaboutthechargesontheobjects.正確答案：ELecture2Coulomb’sLaw--作業(yè)第1題單選題(1分)ABCD第2題單選題(1分)ABCDELecture3ElectricFields--作業(yè)第1題判斷題(1分)Theexistenceofanelectricfieldisapropertyofthesourcecharge.第2題單選題(1分)ABC第3題單選題(1分)Anobjectwithnegativechargeisplacedinaregionofspacewheretheelectricfieldisdirectedverticallyupward.Whatisthedirectionoftheelectricforceexertedonthischarge?AItisup.BItisdown.CThereisnoforce.DTheforcecanbeinanydirection.Lecture4EvaluationofElectricFields（I）--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)A40-μCchargeispositionedonthexaxisatx=4.0cm.Whereshoulda–60-μCchargebeplacedtoproduceanetelectricfieldofzeroattheorigin?A–5.3cmB5.7cmC4.9cmD–6.0cmE+6.0cmLecture5EvaluationofElectricField(II)--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCD第3題單選題(1分)ABCDE第4題單選題(1分)ABCDLecture6ElectricFieldLines--作業(yè)第1題單選題(1分)ABCDELecture7ElectricFlux--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCDE第3題單選題(1分)ABCDELecture8Gauss’sLaw--作業(yè)第1題單選題(1分)Supposeapointchargeislocatedatthecenterofasphericalsurface.Theelectricfieldatthesurfaceofthesphereandthetotalfluxthroughthespherearedetermined.Nowtheradiusofthesphereishalved.Whathappenstothefluxthroughthesphereandthemagnitudeoftheelectricfieldatthesurfaceofthesphere?AThefluxandfieldbothincrease.BThefluxandfieldbothdecrease.CThefluxremainsthesame,andthefieldincreases.DThefluxdecreases,andthefieldremainsthesame.第2題單選題(1分)Ifthenetfluxthroughagaussiansurfaceiszero,thefollowingfourstatementscouldbetrue.Whichofthestatementsmustbetrue?ATherearenochargesinsidethesurface.BThenetchargeinsidethesurfaceiszero.CTheelectricfieldiszeroeverywhereonthesurface.第3題判斷題(1分)TheelectricfieldatanypointonaGaussiansurfaceisproducedbythenetchargeenclosedbytheGaussiansurface.Lecture9ApplicationofGauss’sLaw--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)Acubicalgaussiansurfacesurroundsalong,straight,chargedfilamentthatpassesperpendicularlythroughtwooppositefaces.Nootherchargesarenearby.Overhowmanyofthecube’sfacesistheelectricfieldzero?A0B2C4D6第5題單選題(1分)Acubicalgaussiansurfacesurroundsalong,straight,chargedfilamentthatpassesperpendicularlythroughtwooppositefaces.Nootherchargesarenearby.Throughhowmanyofthecube’sfacesistheelectricfluxzero?A0B2C4D6Lecture10ElectricPotential--作業(yè)第1題單選題(1分)ABC第2題單選題(1分)ABC第3題單選題(1分)ABC第4題單選題(1分)ABC第5題單選題(1分)ABCDE第6題判斷題(1分)Theelectricpotentialatanypointinspaceisdependentonthechargelocatedatthispoint.Lecture11EvaluationofElectricPotential--作業(yè)第1題單選題(1分)Identical4.0-μCchargesareplacedontheyaxisaty=±4.0m.PointAisonthexaxisatx=+3.0m.DeterminetheelectricpotentialofpointA(relativetozeroattheorigin).A–4.5kVB–2.7kVC–1.8kVD–3.6kVE–14kV第2題單選題(1分)AchargeQisuniformlydistributedalongthexaxisfromx=atox=b.IfQ=45nC,a=–3.0m,andb=2.0m,whatistheelectricpotential(relativetozeroatinfinity)atthepoint,x=8.0m,onthexaxis?A71VB60VC49VD82VE150V第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE第5題單選題(1分)ABCDELecture12FindingEfromV--作業(yè)第1題單選題(1分)Inacertainregionofspace,theelectricpotentialiszeroeverywherealongthexaxis.Fromthisinformation,youcanconcludethatthexcomponentoftheelectricfieldinthisregionis:Azero.Binthepositivexdirection.Cinthenegativexdirection.第2題單選題(1分)Inacertainregionofspace,theelectricpotentialis+2Veverywherealongthexaxis.Fromthisinformation,youcanconcludethatthexcomponentoftheelectricfieldinthisregionis:Azero.Binthepositivexdirection.Cinthenegativexdirection.第3題單選題(1分)Inacertainregionofspace,theelectricfieldiszero.Fromthisfact,whatcanyouconcludeabouttheelectricpotentialinthisregion?AItiszero.BItdoesnotvarywithposition.CItispositive.DItisnegative.ENoneofthoseanswersisnecessarilytrue.第4題單選題(1分)ABCDELecture13Propertiesofaconductorinelectrostaticequilibrium（I）--作業(yè)第1題單選題(1分)TheelectricpotentialinsideachargedsolidsphericalconductorinequilibriumAisalwayszero.Bisconstantandequaltoitsvalueatthesurface.Cdecreasesfromitsvalueatthesurfacetoavalueofzeroatthecenter.Dincreasesfromitsvalueatthesurfacetoavalueatthecenterthatisamultipleofthepotentialatthesurface第2題單選題(1分)ABCDELecture14Propertiesofaconductorinelectrostaticequilibrium(II)--作業(yè)第1題單選題(1分)Anastronautisinanall-metalchamberoutsidethespacestationwhenasolarstormresultsinthedepositofalargepositivechargeonthestation.Whichstatementiscorrect?ATheastronautmustabandonthechamberimmediatelytoavoidbeingelectrocuted.BTheastronautwillbesafeonlyifsheiswearingaspacesuitmadeofnon-conductingmaterials.CTheastronautdoesnotneedtoworry:thechargewillremainontheoutsidesurface.DTheastronautmustabandonthechamberiftheelectricfieldontheoutsidesurfacebecomesgreaterthanthebreakdownfieldofair.第2題單選題(1分)Asmallmetalsphereissuspendedfromtheconductingcoverofaconductingmetalicebucketbyanon-conductingthread.Thesphereisgivenanegativechargebeforethecoverisplacedonthebucket.Thebucketistiltedbymeansofanon-conductingmaterialsothatthechargedspheretouchestheinsideofthebucket.Whichstatementiscorrect?AThenegativechargeremainsonthemetalsphere.BThenegativechargespreadsovertheoutsidesurfaceofthebucketandcover.CThenegativechargespreadsovertheinsidesurfaceofthebucketandcover.DThenegativechargespreadsequallyovertheinsideandoutsidesurfacesofthebucketandcover.第3題單選題(1分)ABCDLecture15Dielectrics--作業(yè)第1題判斷題(1分)Dielectricsalwaysreducetheelectricfieldtobezeroduetopolarization.第2題判斷題(1分)Electricdipoleswilltendtoalignwiththeelectricfieldundertheactionofthetorqueexertedbythefield.Lecture16Capacitor&Capacitance--作業(yè)第1題單選題(1分)Whathappenstothemagnitudeofthechargeoneachplateofacapacitorifthepotentialdifferencebetweentheconductorsisdoubled?AItbecomesfourtimeslarger.BItbecomestwotimeslarger.CItisunchanged.DItbecomesone-halfaslarge.EItbecomesone-fourthaslarge.第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE第5題判斷題(1分)FromthedefinitionofcapacitanceC=Q/ΔV,itfollowsthatanunchargedcapacitorhasacapacitanceofzero.第6題判斷題(1分)Asdescribedbythedefinitionofcapacitance,thepotentialdifferenceacrossanunchargedcapacitoriszero.Lecture17Capacitorswithdielectrics--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE第5題單選題(1分)Ifthreeunequalcapacitors,initiallyuncharged,areconnectedinseriesacrossabattery,whichofthefollowingstatementsistrue?ATheequivalentcapacitanceisgreaterthananyoftheindividualcapacitances.BThelargestvoltageappearsacrossthesmallestcapacitance.CThelargestvoltageappearsacrossthelargestcapacitance.DThecapacitorwiththelargestcapacitancehasthegreatestcharge.EThecapacitorwiththesmallestcapacitancehasthesmallestcharge.第6題單選題(1分)Abatteryisattachedtoseveraldifferentcapacitorsconnectedinparallel.Whichofthefollowingstatementsistrue?AAllcapacitorshavethesamecharge,andtheequivalentcapacitanceisgreaterthanthecapacitanceofanyofthecapacitorsinthegroup.BThecapacitorwiththelargestcapacitancecarriesthesmallestcharge.CThepotentialdifferenceacrosseachcapacitoristhesame,andtheequivalentcapacitanceisgreaterthananyofthecapacitorsinthegroup.DThecapacitorwiththesmallestcapacitancecarriesthelargestcharge.EThepotentialdifferencesacrossthecapacitorsarethesameonlyifthecapacitancesarethesame.Lecture18Energystoredinacapacitor--作業(yè)第1題單選題(1分)Aparallel-platecapacitorisconnectedtoabattery.Whathappenstothestoredenergyiftheplateseparationisdoubledwhilethecapacitorremainsconnectedtothebattery?AItremainsthesame.BItisdoubled.CItdecreasesbyafactorof2.DItdecreasesbyafactorof4.EItincreasesbyafactorof4.第2題單選題(1分)Ifthepotentialdifferenceacrossacapacitorisdoubled,whathappenstotheenergystored?AItbecomesfourtimeslarger.BItbecomestwotimeslarger.CItisunchanged.DItbecomesone-halfaslargeEItbecomesone-fourthaslarge.第3題單選題(1分)Aparallel-platecapacitorischargedandthenisdisconnectedfromthebattery.Bywhatfactordoesthestoredenergychangewhentheplateseparationisthendoubled?AItbecomesfourtimeslarger.BItbecomestwotimeslarger.CItstaysthesame.DItbecomesone-halfaslarge.EItbecomesone-fourthaslarge.Lecture20Current&CurrentDensity--作業(yè)第1題單選題(1分)ABCD第2題單選題(1分)ToincreasethecurrentdensityinawireoflengthlanddiameterD,youcanAdecreasethepotentialdifferencebetweenthetwoendsofthewireBincreasethepotentialdifferencebetweenthetwoendsofthewire.Cdecreasethemagnitudeoftheelectricfieldinthewire.Dheatthewiretoahighertemperature.Ecombineboth(2)and(4).Lecture22MagneticFields--作業(yè)第1題單選題(1分)Onereasonwhyweknowthatmagneticfieldsarenotthesameaselectricfieldsisbecausetheforceexertedonacharge+qAisinoppositedirectionsinelectricandmagneticfields.Bisinthesamedirectioninelectricandmagneticfields.Cisparalleltoamagneticfieldandperpendiculartoanelectricfield.Disparalleltoanelectricfieldandperpendiculartoamagneticfield.Eiszeroinbothifthechargeisnotmoving.第2題單選題(1分)Achargedparticle(mass=M,charge=Q>0)movesinaregionofspacewherethemagneticfieldhasaconstantmagnitudeofBandadownwarddirection.WhatisthemagneticforceontheparticleataninstantwhenitismovinghorizontallytowardthenorthwithaspeedV?AQVBtowardtheeastBZeroCQVBtowardthewestDQVBupwardEQVBtowardthesouth第3題單選題(1分)Anelectronmovesintheplaneofthispapertowardthetopofthepage.Amagneticfieldisalsointheplaneofthepageanddirectedtowardtheright.Whatisthedirectionofthemagneticforceontheelectron?AtowardthetopofthepageBtowardthebottomofthepageCupwardoutofthepageDdownwardintothepage第4題多選題(2分)Aspatiallyuniformmagneticfieldcannotexertamagneticforceonaparticleinwhichofthefollowingcircumstances?Theremaybemorethanonecorrectstatement.ATheparticleischarged.BTheparticlemovesperpendiculartothemagneticfield.CTheparticlemovesparalleltothemagneticfield.DThemagnitudeofthemagneticfieldchangeswithtime.ETheparticleisatrest.正確答案：CE第5題單選題(1分)ABCDELecture23ChargedParticleinaMagneticField--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)Achargedparticleismovingperpendiculartoamagneticfieldinacirclewitharadiusr.Anidenticalparticleentersthefield,withvperpendiculartoB,butwithahigherspeedthanthefirstparticle.Comparedwiththeradiusofthecircleforthefirstparticle,theradiusofthecircularpathforthesecondparticleis:Asmaller.Blarger.Cequalinsize.第3題單選題(1分)Achargedparticleismovingperpendiculartoamagneticfieldinacirclewitharadiusr.Themagnitudeofthemagneticfieldisincreased.Comparetheradiusofthenewcircularpathofthefirstparticlewiththeradiusofitsinitialpathis:AsmallerBlargerCequalinsize第4題單選題(1分)Bertsaysthatachargedparticleinavacuumcantravelinahelixonlyifauniformelectricfieldandauniformmagneticfieldarebothpresentandbothparalleltotheaxisofthehelix.Stuartsaysthatonlyamagneticfieldwithacomponentparalleltotheaxisofthehelixisneeded.Whichone,ifeither,iscorrect,andwhy?ABert,becausethechargedparticle’svelocitycanhaveaverticalcomponentonlyifanelectricfieldintheverticaldirectionispresent.BStuart,becauseacomponentofvelocityintheverticaldirectionisnotchangedbyaverticalcomponentofamagneticfield.CBert,becauseacomponentofvelocityintheverticaldirectionischangedbyaverticalcomponentofamagneticfield.DStuart,becauseanelectricfieldintheverticaldirectionwouldcausetheparticletocometoacompletestop.ENeither,becauseparticlescannotmoveinhelicalpathsinthepresenceofmagneticandelectricfields.Lecture24MagneticForceonaCurrent—CarryingConductor--作業(yè)第1題單選題(1分)Awirecarriescurrentintheplaneofthispapertowardthetopofthepage.Thewireexperiencesamagneticforcetowardtherightedgeofthepage.Thedirectionofthemagneticfieldcausingthisforceis:Aintheplaneofthepageandtowardtheleftedge.Bintheplaneofthepageandtowardthebottomedge.Cupwardoutofthepage.Ddownwardintothepage.第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE第5題單選題(1分)ABCDE第6題單選題(1分)ABCD第7題單選題(1分)ABCDLecture25SourcesofaMagneticField--作業(yè)第1題單選題(1分)ABCD第2題單選題(1分)Atapointinspacewherethemagneticfieldismeasured,themagneticfieldproducedbyacurrentelementApointsradiallyawayinthedirectionfromthecurrentelementtothepointinspace.Bpointsradiallyinthedirectionfromthepointinspacetowardsthecurrentelement.Cpointsinadirectionparalleltothecurrentelement.Dpointsinadirectionparalleltobutoppositeindirectiontothecurrentelement.Epointsinadirectionthatisperpendiculartothecurrentelementandperpendiculartotheradialdirection.正確答案：ELecture26CalculationofamagneticfieldbyapplyingtheBiot-SavartLaw--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE第5題單選題(1分)ABCDE正確答案：E第6題單選題(1分)Aloosespiralspringcarryingnocurrentishungfromaceiling.Whenaswitchisthrownsothatacurrentexistsinthespring,thecoils:Amoveclosertogether.Bmovefartherapart.Cdonotmoveatall.Lecture27Ampere’sLaw--作業(yè)第1題單選題(1分)ABCD第2題單選題(1分)Byusingacompasstomeasurethemagneticfielddirectionatvariouspointsadjacenttoalongstraightwire,youcanshowthatthewire’smagneticfieldlinesareAstraightlinesinspacethatgofromonemagneticchargetoanother.Bstraightlinesinspacethatareparalleltothewire.Cstraightlinesinspacethatareperpendiculartothewire.Dcirclesthathavetheircentersonthewireandlieinplanesperpendiculartothewire.Ecirclesthathavethewirelyingalongadiameterofthecircle.第3題單選題(1分)ABCDLecture28ApplicationofAmpere’sLaw--作業(yè)第1題單選題(1分)Considerasolenoidthatisverylongcomparedwithitsradius.Ofthefollowingchoices,whatisthemosteffectivewaytoincreasethemagneticfieldintheinteriorofthesolenoid?Adoubleitslength,keepingthenumberofturnsperunitlengthconstantBreduceitsradiusbyhalf,keepingthenumberofturnsperunitlengthconstantCoverwraptheentiresolenoidwithanadditionallayerofcurrent-carryingwire第2題單選題(1分)ABCDE第3題單選題(1分)ABCDE第4題單選題(1分)ABCDE正確答案：E第5題單選題(1分)Alongstraightwire(diameter=2.0mm)carriesacurrentof25A.Whatisthemagnitudeofthemagneticfield0.50mmfromtheaxisofthewire?A5.0mTB10mTC0.63mTD2.5mTE0.01mT第6題單選題(1分)Alongstraightwire(diameter=2.0mm)carriesacurrentof40A.Whatisthemagnitudeofthemagneticfield1.5mmfromtheaxisofthewire?A3.0mTB12mTC5.3mTD7.4mTE8.0mT第7題單選題(1分)Whenthenumberofturnsinasolenoidanditslengtharebothdoubled,theratioofthemagnitudeofthenewmagneticfieldinsidetothemagnitudeoftheoriginalmagneticfieldinsideis:A0.25B0.50C1D2E4Lecture29Gauss’sLawinMagnetism--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)Auniformmagneticfieldisdirectedalongthexaxis.orwhatorientationofaflat,rectangularcoilistheluxthroughtherectangleamaximum?Aisamaximuminthexyplane.BItisamaximuminthexzlane.CItisamaximumintheyzplane.DThefluxasthesamenonzerovalueforalltheseorientations.EThefluxiszeroinallcases.Lecture30Originofthemagneticeffectofmaterials--作業(yè)第1題單選題(1分)ABCDLecture31Magnetization--作業(yè)第1題判斷題(1分)Themagneticdipolewilltendtoalignwiththedirectionoftheexternalfieldduetotheactionofthenettorque,sothatthesystemhastheminimumvalueofthepotentialenergy.Lecture32MagneticMaterials--作業(yè)第1題單選題(1分)Whichofthefollowingtype(s)ofmaterialsis(are)repelledwhenamagnetisbroughtnearby?AParamagneticBDiamagneticCFerromagneticDparamagneticandferromagneticEparamagnetic,ferromagnetic,anddiamagnetic第2題單選題(1分)WhenaferromagneticmaterialthathasbeenmagnetizedisbroughttoatemperaturegreaterthantheCurietemperature,whathappenstoitsresidualmagnetism.ANothinghappenstotheresidualmagnetism.BTheresidualmagnetismdisappears.CTheresidualmagnetismreachesit’shighestvalue.DAllthemagneticdomainscausingmagnetismbecomeasingledomain.EThematerialofthemagnetmeltscausingcurrentsthataremagnetic.第3題單選題(1分)Ontheaverage,inaferromagneticdomainpermanentatomicmagneticmomentsarealigned_____tooneanother.AantiparallelBparallelCperpendicularDalternatelyparallelandantiparallelErandomlyrelativeLecture33Faraday’sLaw--作業(yè)第1題單選題(1分)ABCDE第2題單選題(1分)ABCDE第3題單選題(1分)Acircularloopofwireisheldinauniformmagneticfield,withtheplaneoftheloopperpendiculartothefieldlines.Whichofthefollowingwillnotcauseacurrenttobeinducedintheloop?AcrushingtheloopBrotatingtheloopaboutanaxisperpendiculartothefieldlinesCkeepingtheorientationoftheloopfixedandmovingitalongthefieldlinesDpullingtheloopoutofthefieldLecture34MotionalEMF--作業(yè)第1題多選題(2分)ABCDE正確答案：CD第2題多選題(2分)ABCDE正確答案：BD第3題單選題(1分)ABCDE正確答案：E第4題單選題(1分)AcurrentmaybeinducedinacoilbyAmovingoneendofabarmagnetthroughthecoil.Bmovingthecoiltowardoneendofthebarmagnet.Choldingthecoilnearasecondcoilwhiletheelectriccurrentinthesecondcoilisincreasing.Dalloftheabove.Enoneoftheabove.第5題單選題(1分)AninducedemfisproducedinAaclosedloopofwirewhenitremainsatrestinanonuniformstaticmagneticfield.Baclosedloopofwirewhenitremainsatrestinauniformstaticmagneticfield.Caclosedloopofwiremovingatconstantvelocityinanonuniformstaticmagneticfield.Dalloftheabove.Eonly2and3above.Lecture35InducedElectricField--作業(yè)第1題判斷題(1分)Theelectricfieldinducedbychangingmagneticfieldisnonconservative,whiletheelectricfieldproducedbythestationaryelectricchargesisconservative.Lecture36Generators--作業(yè)第1題單選題(1分)InanACgenerator,acoilwithNturnsofwirespinsinamagneticfield.Ofthefollowingchoices,whichdoesnotcauseanincreaseintheemfgeneratedinthecoil?AreplacingthecoilwirewithoneoflowerresistanceBspinningthecoilfasterCincreasingthemagneticfieldDincreasingthenumberofturnsofwireonthecoil第2題單選題(1分)ThedifferencebetweenaDCandanACgeneratoristhatATheDCgeneratorhasoneunbrokenslipring.BTheACgeneratorhasoneunbrokenslipring.CTheDCgeneratorhasoneslipringsplitintwohalves.DTheACgeneratorhasoneslipringsplitintwohalves.ETheDCgeneratorhastwounbrokensliprings.Lecture37Inductance--作業(yè)第1題單選題(1分)Twosolenoids,AandB,arewoundusingequallengthsofthesamekindofwire.Thelengthoftheaxisofeachsolenoidislargecomparedwithitsdiameter.TheaxiallengthofAistwiceaslargeasthatofB,andAhastwiceasmanyturnsasB.WhatistheratiooftheinductanceofsolenoidAtothatofsolenoidB?A4B2C1D1/2E1/4第2題單選題(1分)ABC第3題單選題(1分)ABC第4題單選題(1分)ABC第5題單選題(1分)AninductorproducesabackemfinaDCseriesRLcircuitwhenaswitchconnectingthebatterytothecircuitisclosed.WecanexplainthisbyALenz’slaw.Bincreasingmagneticfluxwithinthecoilsoftheinductor.Cincreasingcurrentinthecoilsoftheinductor.Dalloftheabove.Eonly(1)and(3)above.第6題單選題(1分)Acoilwithzeroresistancehasitsendslabeleda