第3章 恒定磁场

1、dtdqtqti0limIdtdq常数tqS的电荷通过面SIJ)()?(0lim22米安mASISJtvSStvQ)()(svtQISSdJIvJSISJ0limdsdl)()?(米安mASlIJltvQS)()( )?(米安mASSvJlvIS2121122021)(4C CRRal dIl dIF)/(10470mH)/(1085. 8109411290mF?1002121122021)(4C CRRal dIl dIF2121122021)(4C CRRal dIl dIF122110224CRCRal dIl dIBl dIC222121104CRRal dIBBRaRl dIBd20

2、4场源源源CRSaRl dIBdB204场源源源BalIdRCRRal dIB204aRlIdBd 20sin4VRVdRaJB204SRSSdRaJB2042121122021)(4C CRRal dIl dIFBl dIC222BvdqBdtvdtdqBl dIFd)(2221BvqEqF合SSdBSdRalIdSCR204CRRal dIB204BACACBCBA)()()(l dRSdaICSR204CSSdRlId140CVdVRlId1400140CVdVRlId0SSdB0VSdVBSdB0BCVdVRlId140CIl dB0SCSSdJIl dBSdB00JB0CRCRRal

3、 dIRalIdH2221441场源源CRRal dIB24场源源HBIl dHCJH0 BJB00sSdBIl dBC0JHIl dHC)(daIalId22azRR源点到场点CRSaRl dIBdB204场源源源RaRaRzaarzazz2222sincosRaRaRrz ?Ra单位矢量)(daIalIdCRSaRl dIBdB204场源源源2030)sincos(4daaaRIaBrz)(2232220TazIaaBz22azRR源点到场点 ?RaCRRal dIB24场源源24RazdIHRdzRIa2sin4dzzrzrrIa2222/4rIa2Il dHCIrHdlHl dHCC2

4、rIH2 rIaH2 AJBB00JA0AARl dIBC4 0)()()(BACACBCBAJA0AAAA22)()(AAA)(20AJAA02JA02源场源CRdlIA40源场源VRdVJA40源场源SSRdSJA40JA020ABCSSl dASdASdBBAJBB00ABH场源RdlIAd40AB rrIaAz00ln2aIzxyo),(RPzy2204sinRIaaARzxyo),(RP RmRmpRapA102044ABsin4cos23030rParPaBmmRsin4cos23030rParPaEeeR外磁场方向外磁场方向nana外法线外法线外法线外法线)/(lim0mApNp

5、NMmm)/()/(2mAaMJmAMJnmsm”JBB00MJJB01对应磁化电流 Im对应自由电流 IMJJJBM01JMB0)/(0mAMBH自由电流体密度 JH0pcfcSqqSdEfcPE)(0fcD自由电流体密度 JH SSSdJSdHIl dHC)/(:mAH)/(:mVEHMmEPe0EEDe)1 (0MBH0HHHBrm001.m)/(:2mWbB)/(:mAHr01mr磁介质的边界条件磁介质的边界条件1 10SSdBnnaBaB2121AAnnBB21sFreenJHHa)(2121HaHannttHH21Il dHC)(1)(12211AAsFreettJHH212121

6、tgtg2121tgtg21HaHannnnaBaB21IIBNSSdB)( HIL 11212IM22 aIraH1220draIrSdBd?0adr80LarrdraIardard 022022228200340IdrraIa80ILarII2l1l121211101IlNB212aB2212aBNII2211011212aNNlIMII2l1l磁场能量密度：221212121BHHBwm.21212EEDwe储藏在磁场中的能量.VmmdVwW.212ILWm1212a ab ba ab bI II I2 21 1a ab ba ab bI II I2 21 1)(0)(2)(2020brbrarIaararIaBbaaVmmdrrdVwW.)21 (.2100.212ILWm )/(ln28.mHLabIIBIB)(mNBpTm)(SIap