《大学物理》模拟试卷二十 9页

《大学物理》模拟试卷二十Documentsfromthenetwork,Icollected,finishing,andifthereareomissions,errors,butalsopleasecorrectme!"CollegePhysics"simulationpapertwentyNote:1.,pleasecandidatesanswerthequestionswrittenontheanswerpaper,theanswerisinvalidonthetestpaper2.,intheanswerpaperseallineoutsideofthename,classnumberandmark,tocheatingtheoryFirst,individualchoicequestions(2pointspergame,30points)1.inavacuum,thepointchargeofelectricityisthemagnitudeoftheelectricfieldproducedatitsdistanceA.B.C.D.2.thepointwheretheelectricfieldforceofapointinanelectricfieldiszeroisthepointThefieldstrengthofA.mustbezeroandthepotentialmustbezeroThefieldstrengthofB・isnotzero,andthepotentialmustbezeroThefieldstrengthofC.mustbezeroandthepotentialisnot\nzeroThefieldstrengthofD・isnotzero,andthepotentialisnotzero1.thetwo-pointchargeis1metersapart,thepowerisrespectively,andthepointchargeonthelineiszero,andthedistaneebetweenthepointandthechargeis()A.mB.C.D.2.Invacuum,theelectricityisseparatedfromthetwochargesIftheelectricpotentialatinfinityiszero,thepotentialatthemidpointoftheirconnectionis()A.BC.D.3.,therelationbetweenelectricfieldandelectricpotentialiscorrectThelocalpotentialoftheA.fieldmustbelowandthefieldstrengthisstrongwhenthepotentialishighWhenthefieldstrengthiszero,theelectricpotentialofB・mustbezero,andthefieldstrengthmustbezerowhenthe\nelectricpotentialiszeroWherethefieldstrengthsareequal,thepotentialoftheC・isnotnecessarilyequalThemagnitudeoffieldstrengthontheequipotentialsurfaceofD.mustbeunequalAsfigure6.shows,thereareinfinitetwoparallelstraightwire,respectively,andthecurrentgenericWhenthemagneticinductionintensityatonepointonthetwowireplaneiszero,themagnitudeanddirectionofthetwocurrentmustbeA.,intheoppositedirection,B.,intheoppositedirectionC.,thesamedirection,D.,theoppositedirection7.capacitorseachwithCareconnectedinseries,andthetotalcapacitanceis(two)A.B.C.D.8.whenachargedparticleisperpendiculartoamagneticfield,itstrajectoryisacirclewhoseradiusisR・Iftheradiusoftheorbitischanged,thestrainofmagneticinductionis()A.B.C.D.\n9,abouttheGausstheoremofelectrostaticfield,thecorrectstatementis()TheA.integralnumberisexcitedbyallchargesintheGaussplaneTheB.integralnumbetisexcitedbyallchargesoutsidetheGaussplaneTheC.integralnumberiscostimulatedbyallchargesinsideandoutsidetheGaussplaneD.abovethreestatementsarewrong10,asshownintheuniformmagneticfield,thereisanirregularshapeofthewire,thewireislocatedintheorthogonalplanewiththemagneticfield,thedirectionofthemagneticfieldperpendiculartothesurfaceIftheconductorwithcurrent,andlineardistaneebetweentwopoints,thenleadthemagneticforcesize()A.B.C.D.11,Inthefollowingdescription,whatiscorrectis()A.inducedelectricfieldexertsanelectricforceonthecharge.B.inducedelectricfieldbelongstoirrotationalfieldD.potentialelectricfieldcanbeintroducedinB.induced\nelectricfieldandinducedelectricfielddependsontheexistenceofconductor12.AccordingtoFaraday，slawofelectromagneticinduction,themagnitudeoftheinducedelectromotiveforceintheclosedloopdependsonA.theinitialmagneticflux,B.,thefinalfluxTherateofchangeofC.magneticflux;theincrementofD.magneticfluxAvioletlightwithawavelengthof13.=400nmInaglasswitharefractiveindex,thephaseoftheoscillationofthelambdalightchangesfrompointtopoint,andthepathofthelightfrompointtopointis()A.3000nmB.2000nmC.1500nmD.lOOOnmInthe14.Yangdoubleslitexperiment,thespacingbetweenthetwoslitsisreducedwhentheincidentlightwavelengthandthestitchscreendistanceareunchangedA.Thewidthofinterferencefringebecomessmaller,andthewidthofB.fringebecomeslargerThefringewidthofC.interfereneeisunchangedandthenumberoffringesincreasesinagivenregionofD.\n15.,thelightoflambda=500nmisprojectedontheplanediffractiongratingof2000/cm,andthediffractionangleofthefifthspectrallineshouldbe()A.B.C.D.Two,fillintheblanks(2pointsperminute,20points)1.intheair,achargedconductorapproachesachargedbodytoachieveelectrostaticequilibriumIfthesurfacechargedensityonthesurfaceoftheconductorsomewhere,theexternalelectricfieldstrengthnearthesizeof2.moveaprotonintheelectrostaticfieldfromtheApointthroughapathtotheBpoint,andtheelectricfieldworkisJouleDoestheprotonfrompointBtopointAthroughanotherpath,fieldworkforJouleThemathematicalexpressionofmagneticfieldintheBiotSavartlaw3.vacuumfor;mathematicalexpressionsofsteadymagneticfieldisAmperecircuitaltheorem,itshowsthattheconstantmagneticfieldis(fillin"rotationalfield"or^irrotationalfield");mathematicaltablesofGauss'slawconstantmagneticfieldoftheformulafor•Itshowsthattheconstantmagneticfieldis(fillmactiveorpassive)The4.sidelengthofsquarecurrentcarryingcoil,coilunit\nvectornormaldirectionistheplane,asthecurrentinthecoil,themagneticmomentisthecoilfor5.,twoparallelcurrentcarryingconductorswiththesamecurrentdirection(fillin"rejectiorT,，，attract，zor"void")6.,therearetwopolarizingplates,oneofwhichisusedaspolarizerandtheotherasanalyzerTurnthepolarizertoalightbulbandrotatetheanalyzerforoneweek・TheresultofobservationisthatFillin"lightintensityunchanged"or"lightintensitychangewithtwoextinction"Three,thecalculationquestions(10pointspergame,50points)1,thereisauniformchargedshellwitharadiusandachargedquantity・Theelectricfieldintensitydistributionandpotentialdistributioninsideandoutsidetheshellarecalculated2,twoinfinitelylong,uniformlycharged,straightlinesplacedparalleltoeachotherLetthetwoofthemhavethesamenumberofdifferentcharges,andthepowerperunitlengthisrespectively,Ontheplanecomposedoftwolines,thefieldintensitybetweentwolinesisdetermined\n1,asshowninthevacuum,aninfinitelongstraightwirecontainingcurrentisbentattheradiusofacircle,andbecausethewirehasaninsulatinglayer,itisnotshort-circuitattheplaceFindthemagnitudeanddirectionofthemagneticinductionatthecenterofthecircle2,asshowninthediagram,aninfinitecurrentofdirectcurrentcarryingwireisadjacenttoaconductorperpendiculartoitandcoplanarwithit,solongastheendisapartfromthewireWhatisthemagnitudeoftheinducedelectromotiveforcewhenthewiremovesatacurrentratealongthecurrentdirection?Whichendhasahighpotential?3,Thewhitelightisirradiatedverticallyontheglassinthethicknessofd二5*10-7mintheair・Therefractiveindexoftheglassisso.Inthevisiblerangeof400〜700nmwavelength,whatwavelengthoflightisreflectedinthereflection?Whichwavelengthsoflightareenhancedintransmission?99••\n99••99••99••