大学物理双语版奥本汉姆课件chap

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1、大学物理双语版奥本汉姆课件Chap&MagFie1Alongstraightwire载流长直导线的磁场P614ThemagnitudeofthedifferentialmagneticfieldproducedatPbythecurrent-lengthelementIdslocatedadistancerfromPisgivenby2TheapplicationofBiot-SavartlawrRsins-RcotxPRsLI12IIDiscussions①Themagneticfieldfromallcurrentelementofstraightwireareinthesa

2、medirectionandintothescreen②Forstraightandinfinitewire无限长载流直导线102thenThemagnitudeofmagneticfieldofinfinitestraightwireatapointwithdistanceRisininverseproportiontothedistanceThecasegiveninP6142Inacirculararcofwire载流圆线圈轴线上的磁场AsthefiguregivenIRxIpxxR0ThedirectionofisperpendiculartotheplanemadeofIdsa

3、ndrandIpxxR0Discussions①AtcenterOx0②Foracirculararcofwire一段圆弧电流圆心处的磁感应强度③Thedirectionofisalongtheaxisdirectionright-handruleasrightfigureandFig26-18inP615SolutiondirectintothescreenintothescreenYoumaycomparingwiththecalculationofelectrostaticfieldExample26-11ofP616Onequarterofacircularloopofwirec

4、arriesacurrentIandtwostraightsectionswhoseextensionsintersectthecenterCofthearcFindatpointC132Forparts1and2Thenumberofturnsperunitlengthofthesolenoid螺线管单位长匝数nAsverticalcrosssection纵剖面shownInRL123Astretched-outsolenoid载流直螺线管轴线上的磁场IIThinkabouthowtochooseacurrent-elementdIdxxL12PchoosedInIdxxRcotdxR

5、csc2dR2x2R2csc2SamedirectionExplanations②ForainfinitelylongsolenoidTheattheaxialline–5R5R0439Bx①Directioninsidethesolenoidisalongtheaxisandright-handruleasFig26-12③B-xcurveinsidethesolenoidL10R25-7AmperesLoopLawApplicationAndreMarieAmpere17751836Frenchmathematicianandphysicist安培分子环流假说Thesourceofm

6、agnetismofallnatural-mattercomefromcurrent一切磁性的根源是电流AmpereAllmagneticphenomenacomefromcurrent一切磁现象都起源于电流1AmpereslooplawP607AnylineintegralofaroundaclosedpathwasproportionaltothecurrentencircledbythepathinSIunits在恒定磁场中磁感强度沿任一闭合环路的线积分等于穿过该环路所围曲面的所有电流代数和的倍NoteItisonlyholdforclosedsteady闭合恒定currentCo

7、ntributedbyallcurrentinspaceFreelychooseaclosedloopandassignapositivedirectionExplanationThenetcurrentencircledbytheloop与L套连的电流回路所围面积截得accordwithright-handrule与L绕行方向成右螺电流取正AnydifferentialelementsontheLalongthetangentdi