大学物理（下）（College Physics II）智慧树知到期末考试答案2024年

大学物理（下）（CollegePhysicsII）智慧树知到期末考试答案2024年大学物理（下）（CollegePhysicsII）Twolong,straight,parallelwiresareadistancedapart.WireAcarriesacurrentofI,WireBcarriesacurrent2I.TheratiooftheforceonWireAtotheforceonWireBis()

A:2:1B:1:4C:1:1D:4:1E:1:2答案:1:1Thepositionofa0.64-kgmassundergoingsimpleharmonicmotionisgivenbyx=(0.160m)cos(πt/16).Whatisitsperiodofoscillation?()

A:4.5sB:100sC:16sD:32sE:8.0s答案:32sAtwhatanglewillthesecondordermaximumoccurforawavelengthof400nmusingadiffractiongratingwith10000linespercm?()

A:24degreeB:53degreeC:15.5degreeD:Nosecondordermaximumwilloccurinthiscase.答案:53degreeAcharge+Qisfixedinpositionasasmallcharge+qisbroughtnearitandreleasedfromrest.Whichbestdescribesthemagnitudeofthevelocityofthecharge+qasr,thedistancebetweenthechargesincreases?()

A:Themagnitudeofthevelocitywilldecrease,anditsrateofdecreasewillalsodecrease.B:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.C:Themagnitudeofvelocitywillincrease,butitsrateofdecreasewillincrease.D:Themagnitudeofthevelocitywillremainconstant.E:Themagnitudeofthevelocitywillincrease,anditsrateofincreasewillalsoincrease.答案:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.AllofthefollowingaretrueaboutcylindricalcapacitorsEXCEPT()

A:ThecapacitanceisequaltothechargedividedbythepotentialdifferenceB:TheelectricfieldwillpointradiallytowardthecentralaxisofthecylindersC:TheelectricfieldbetweenthetwocylindersisdeterminedbyonlythechargeontheinnercylinderD:TheelectricfieldoutsidethecylinderiszeroE:Thepotentialdifferencebetweenthetwocylindersisthenegativederivativeoftheelectricfield答案:TheelectricfieldbetweenthetwocylindersisdeterminedbyonlythechargeontheinnercylinderInNewtonsringsexperiment,ifwereducetheradiusofcurvatureofPlanoconvexlenstozero,whatwillbeeffectonNewtonsrings?（）

A:TheywillbecomedarkerB:TheywillbecomebrighterC:TheywillbemoredenseD:Theywilldisappear答案:TheywilldisappearInNewtonsringsexperiment,ifmonochromaticsourceoflightisreplacedbyanothermonochromaticsourceofhigherwavelength.Whatwillbetheeffectonradius(ordiameter)?()

A:Radius(ordiameter)willremainconstantbuttherewillbemorebrightnessB:Radius(ordiameter)willdecreaseC:Radius(ordiameter)willincreaseD:Therewillbenoeffect答案:Radius(ordiameter)willincreaseThekineticenergyofthebobonasimplependulumswinginginsimpleharmonicmotionhasitsmaximumvaluewhenthedisplacementfromequilibriumisatwhatpointinitsswing?()

A:1/2theamplitudeB:equaltheamplitudeC:zerodisplacementD:3/4theamplitudeE:1/4theamplitude答案:zerodisplacementAmassof0.40kg,hangingfromaspringwithaspringconstantof80N/m,issetintoanup-and-downsimpleharmonicmotion.Whatisthespeedofthemasswhenmovingthroughapointat0.05mdisplacement?Thestartingdisplacementofthemassis0.10mfromitsequilibriumposition.()

A:1.4m/sB:1.0m/sC:1.7m/sD:zeroE:1.2m/s答案:1.2m/sWhenthelightisincidentattheBrewsteranglewhichofthefollowingiscompletelypolarized()

A:bothB:ReflectedlightC:RefractedlightD:neitherreflectedNorRefracted答案:ReflectedlightAmassonaspringvibratesinsimpleharmonicmotionatafrequencyof4.0Hzandanamplitudeof8.0cm.Ifatimerisstartedwhenitsdisplacementisamaximum(hencex=8cmwhent=0),whatisthedisplacementofthemasswhent=3.7s?()

A:0.036mB:0.025mC:0.080mD:0.095mE:zero答案:0.025mLightisreflectingoffawedgeshapedthinpieceofglassproducingbrightanddarkinterferencefringes.Ifacertainlocationhasabrightfringe,anearbypointwillhaveadarkfringeifthethicknessoftheglassincreasesby:()

A:1/4ofawavelengthofthelight.B:onewavelengthofthelight.C:1/2ofawavelengthofthelight.D:1/8ofawavelengthofthelight.答案:1/4ofawavelengthofthelight.Theelectricpotentialadistancerawayfromacylindercanbecalculatedbydividingachargeqinto()

A:theworkdoneonthemagneticfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.B:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.C:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointinsidethecylinder.D:theforceonachargeqasitmovesfromapointonthecylindertoapointinsidethecylinder.E:theworkdoneonthemagneticfieldasachargeqmovesfromapointonthecylindertoapointinsidethecylinder.答案:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.Twoparallelconductingplates,separatedbyadistanced,areconnectedtoabatterywithavoltagesourcethatsuppliesapotentialdifferenceV.Iftheseparationbetweentheplatesishalved,whichofthefollowingwilloccur?()

A:Thecapacitancewillnotchange.B:Theelectricchargeontheplateswillbehalved.C:Theelectricchargeontheplateswillbedoubled.D:Thepotentialdifferencebetweentheplateswillbedoubled.E:Thepotentialdifferencebetweentheplateswillbehalved.答案:Theelectricchargeontheplateswillbedoubled.Bywhatfactormustonechangetheweightsuspendedverticallyfromaspringcoilinordertotripleitsperiodofsimpleharmonicmotion?()

A:12B:9.0C:1/9D:0.33E:3.0答案:9.0Amagneticfieldexertsanon-zeroforceonaparticle.Whichofthefollowingmustbetrue?()

A:Thedirectionoftheforceisperpendiculartothemagneticfieldbutparalleltothemotionoftheparticle.B:Thedirectionoftheforceisperpendiculartoboththevelocityoftheparticleandthemagneticfield.C:Theparticleisstationary.D:Thedirectionoftheforceisparalleltothemagneticfieldbutperpendiculartothemotionoftheparticle.E:Theparticleisnegativelycharged.答案:Thedirectionoftheforceisperpendiculartoboththevelocityoftheparticleandthemagneticfield.Inorderforamagneticfieldtoexertaforceonanobject,whichofthefollowcanbetrue?(

)I.Theobjectischarged.II.Theobjectismovingparalleltothefield.III.Theobjectismovingperpendiculartothefield.

A:IandIIonlyB:IandIIIonlyC:IIIonlyD:IonlyE:IIonly答案:IandIIIonlyWhatcreatesamagneticfield?Morethanoneanswermaybecorrect.()

A:astationaryconductorcarryingelectriccurrentB:adifferenceinelectricpotentialC:astationaryobjectwithelectricchargeD:achargedcapacitordisconnectedfromabatteryandatrest答案:astationaryconductorcarryingelectriccurrentTheindexofrefractionofflintglassis1.66andtheindexofrefractionofcrownglassis1.52.Afilmformedbyonedropofsassafrasoil,onahorizontalsurfaceofaflintglassblock,isviewedbyreflectedlight.Thefilmappearsbrightestatitsoutermargin,whereitisthinnest.Afilmofthesameoiloncrownglassappearsdarkatitsoutermargin.Whatcanyousayabouttheindexofrefractionoftheoil?()

A:Itmustbelessthan1.52.B:Noneofotherchoicesisnecessarilytrue.C:Itmustbebetween1.52and1.66.D:Itmustbegreaterthan1.66.答案:Itmustbebetween1.52and1.66.Thedisplacementy(x,t)ofaparticulartravellingwavehastheformy(x,t)=Asin(x+πt/2).Whatisthespeedofthiswave,ignoringitsdirection?()

A:4B:8πC:noneofotheranswersD:2πE:π/2答案:π/2Thepositionofanobjectmovingwithsimpleharmonicmotionisgivenbyx=4cos(6πt),wherexisinmetersandtisinseconds.Whatistheperiodoftheoscillatingsystem?()

A:1/6sB:impossibletodeterminefromtheinformationgivenC:1/3sD:6πsE:4s答案:1/3sAnorecarofmass4000kgrollsdownhillontracksfromamine.Attheendofthetracks,10.0mlowerinelevation,isaspringwithk=400000N/m.Howmuchisthespringcompressedinstoppingtheorecar?Ignorefriction.()

A:1.96mB:1.40mC:0.56mD:2.43mE:0.14m答案:1.40mWhatprincipleisresponsibleforthefactthatcertainsunglassescanreduceglarefromreflectedsurfaces?()

A:refractionB:diffractionC:polarizationD:totalinternalreflection答案:polarizationAwaveisrepresentedbytheequationy=(1mm)cos(60t+4x),whichoneofthefollowingistrue()

A:wavevelocityis100m/sB:Frequency=30/πC:Amplitude=0.001mmD:MaximumVelocityoftheParticle60mm/sec答案:Frequency=30/πWhichofthefollowinginconservedwhenlightwavesinterfere?()

A:EnergyB:AmplitudeC:IntensityD:Mass答案:EnergyTwolongparallelwires,fixedadistancedapartinspace,eachcarryacurrentI.TheforceofattractionbetweenthemisF.WhichotherarrangementofcurrentsinlongparallelwireswouldproducethesameforceF?()

A:acurrentof3Iandadistanceof9dB:acurrentof6Iandadistanceof3dC:acurrentof9Iandadistanceof3dD:acurrentof3Iandadistanceof3dE:acurrentof3Iandadistanceof6d答案:acurrentof3Iandadistanceof9dApolicecarhasasirenwhichwailsatawavelengthλaccordingtoalistenertravellinginthecar.Whatisthewavelengthofthesirenasheardbyapersonstandingonthestreetasthecarapproachesthemataspeedv?Thespeedofsoundinairisc.()

A:0B:λC:(1+v/c)λD:2vλ/cE:(1-v/c)λ答案:(1-v/c)λInMichelsonsinterferometer100fringescrossthefieldviewwhenthemovablemirrorisdisplacedthrough0.0248mm.Thewavelengthofthemonochromaticlightis()

A:400.0nmB:496.0nmC:589.0nmD:589.6nm答案:496.0nmIfthecurrentinaninductorisdoubled,bywhatfactoristhestoredenergymultiplied?()

A:1/4B:2C:1D:4E:1/2答案:4Themotionofapistoninanautomobileengineisnearlysimpleharmonic.Ifthe1-kgpistontravelsbackandforthoveratotaldistanceof10.0cm,whatisitsmaximumspeedwhentheengineisrunningat3000rpm?()

A:1.66m/sB:3.93m/sC:15.7m/sD:31.4m/sE:7.85m/s答案:15.7m/sWhichofthefollowingdevicescanbeusedtoproducebothatransverseandlongitudinalwaves?()

A:AhelicalspringB:AstringC:ArippletankD:Atuningfork答案:AhelicalspringAstheslitseparationincreases,whathappenstotheseparationbetweentheinterferencefringesonthescreen?()

A:Itremainsthesame.B:Itmayincreaseordecrease,dependingonthewavelengthofthelight.C:Itdecreases.D:Moreinformationisrequired.E:Itincreases.答案:Itdecreases.Thepotentialofapoint-chargeisgivenbytheequationV(r)=kq/r.Determinetheelectricfieldatsomedistancerfromq.（）

A:B:C:D:E:答案:AI参考:正确答案是D：\n\n电场强度E=kQ/r²\n\n根据题目给出的电荷q和距离r，可以使用库仑定律来计算电场强度。电场强度E与电荷q和距离r的平方成反比，即E=kQ/r²，其中k为库仑常数，Q为源电荷。因此，正确答案为D：电场强度E=kQ/r²。'Asolidinsulatingsphereofradius5cmcarrieselectricchargeuniformlydistributedthroughoutitsvolume.Concentricwiththesphereisaconductingsphericalshellwithnonetchargeasshowninthefigure.Theinnerradiusoftheshellis10cm,andtheouterradiusis15cm.Nootherchargesarenearby.AmongthepointsA(atradius4cm),B(radius8cm),C(radius12cm),andD(radius16cm),whichpointhasthegreatestelectricfield?（）

A:B:C:D:答案:AI参考:正确答案是C：在半径为12cm的点C，有最大的电场强度。\n\n球体的半径为5cm，因此，可以求出电场强度E的值；内外导电层的半径分别为15cm和10cm，由导体内部场强为0可得出电场强度的值。而在内外导体层中都未达到场强为0，需要看哪一层的E值最大，可知答案为C。因此选择C。'Twocharges,magnitudeq,ofopposite

sign,arelocatedadistancedfromtheoriginAofa

coordinatesystem.

Atwhichofthefollowingpointsistheelectricfieldgreatestinmagnitude?

A:EB:AC:CD:DE:B答案:AI参考:正确选项是【B】\n\n根据题目描述，有两个电荷，其中一个电荷的电荷量为q，位于坐标原点A处，另一个电荷的电荷量为-q，位于距离原点A为d的位置。这两个电荷在原点A处产生的电场相互抵消，因此在原点A处的电场强度为零。\n\n而在距离原点A为d的位置，由于两个电荷的电荷量相等，但符号相反，因此该位置的电场强度E可以表示为kq/(r²)中的常数k与该位置处正、负电荷的比值，其中r为两点之间的距离。根据该公式，如果正、负电荷的电量都增加，那么E会随着正、负电荷电量之间的平方的比值增大而增大。因此，对于电场最大的点，需要考虑的是该位置处的正、负电荷量。\n\n根据题目的描述，电场最大值应该在C点的正上方或者下方。因为该位置处正、负电荷相等且相反，如果考虑距离因素，只有在C点的正上方或者下方位置上才会使得两个电荷的电量相同且符号相反，此时产生的电场强度最大。因此，正确的选项是B。\n\n另外需要注意到题目的图片中给出了一个图像，但是这个图像并不能帮助我们选择正确答案。这个图像仅仅提供了一些电场强度的数值分布情况，与选择正确答案无关。'Anelectricdipoleismadeupoftwooppositechargeswithequalmagnitudeqseparatedbyadistanced.Midwaybetweenthecharges,theelectricfieldis()

A:B:C:D:E:0答案:AI参考:正确答案是E：0。\n根据电偶极子的定义和性质，两个电荷在中间位置的电场强度相互抵消为零。因此，选项E为正确答案。'IftheelectricpotentialofasystemisgivenbytheequationV(r)=5ln(r^2),whatistheequationfortheelectricfieldinthissystem?（）

A:B:C:D:E:答案:AI参考:正确答案是D：E:。\n根据题目中的方程式V(r)=5ln(r^2)，可以得出电场E(r)=5/r，即电场强度与距离成反比，因此答案为E。'AnunchargedsolidconductingsphereofradiusrisplacedinauniformelectricfieldofmagnitudeE.Themagnitudeoftheelectricfieldatthecenteroftheconductoris()

A:B:0C:D:E:答案:AI参考:正确答案是B：0。\n根据静电平衡条件，导体内部场强为零，而本题中电场线只从球外指向球内，故在导体球球心处电场强度为零。因此，本题答案为B。'ThemagneticfieldinsideasolenoidisB.Asecondsolenoidhast