大学物理电磁感应

1、N一、电磁感应现象一、电磁感应现象实验一实验一实验二实验二NSNS实验三实验三实验四实验四实验实验Ndtdin00dtd0iin00dtd0i0dtd0iiii0dtd0i RIii21ttiidtIq211dR)(121RdtdR1)(21Ndtddtd =Nn21dtdidtdN)()()(21dtddtddtdNiLKil dE通过闭合回路通过闭合回路L所围面积的磁通量为所围面积的磁通量为SdBdtdl dELSKSSdBMIMnIBr0NNBSnISNr0dtdidtdInSNr0V75. 0iRIii275. 021ttiidtIqtIiC75. 0A38. 0B 00aaBn2co

2、sBStBacos2ntBa2cos2dtdNintnNBa2sin220302ntnNBai2设设 方向顺时针，方向顺时针， 方向方向in12sinntnNBai2max2slRsNa4)(21RNqi)180cos0cos(0202BaBaRNRNBa222BasntnNBai2sin22iINiINdtdiIabcd1l2lxvIabcd1l2ldrrSdBddrlrI102SSdB2210lxxrdrIlxlxIl210ln2dtdidtdxlxxlIl)(22210)(22210lxxvlIlIabcd1l2labcdvBSBBSBlxldtdi)(BlxdtddtdxBlBlvia

3、bcdvBliBvef)(Bvabf-形成逆时针方向的感应电流形成逆时针方向的感应电流fKEeBve )(BvEKLKil dEabKl dEabl dBv)(BlvvBabkE 0iiLil dBv)(vfdtdi2. Lil dBv)(OAldl dl ldl dBvdi)(vBdllBdlLoiidLolBdl221BLvOA2021BLUUAOAAOOA ABdSddBL221dtdi221LBvIABalvxdxxdIABalvxdxxdBvdi)(BvdxvdxxI20laaixdxIv20alaIvln20-涡旋电场涡旋电场NLKil dEdtdiSSdBdtdSSdtBSdtB

4、l dELSK R0rLKdtdl dE)(2SBdtdrEKdtdBr20BdtdBRrEK22dtdBrREK221 R0RkErdtdBrEK2bakabl dEkEbakdlEcosdtdBrEK2ldkEbaabdldtdBrcos222)2(cosLRdrldrdtdBbacos21baabdlLRdtdB22)2(2122)2(2LRdtdBLkE0abBS22)2(21LRLBdtdab)2(2122LRLBdtd22)2(21LRLdtdBteItI0)(IlvabcdhytItB2)()(0Ilvabcdhy SSdBt)(lhhxdyytI2)(0hlhxtIln2)(0

5、dttdi)()(ln20dtdxIxdtdIhlhhlhtveItln) 1(200hlhxtItln2)()(0动感iSlydBvSdtB)(lhhhlhdyytIvxdyytIt2)(2)(00IlvabcdhhlhtveItln) 1(200hlhveIhlhtveIttln2ln20000金属杯金属杯金属块金属块 SN1B2B1I2I12121I12121IMdtd212dtdIM121dtd121dtdIM2121221MMM1l2l111InB111IlNSBN122111221lIRNN12121IM1221lRNN221Vnn222InB222IlN1l2lSBln22112

6、2221SlInn2221VInn1l2l21212IM221VnnMMM2112dtdIMi1dtdIlRNN1122122121VnnMr1CR2C/Sr cm1 . 1Rr RINB2220r1CR2CBSN112RSINN222102 . 021041005010447H1028. 66(2)dtdIM21V1014. 34212IMRSNN2210LIdtdLdtdILI-反电动势反电动势dtdILL(3) -电磁惯性电磁惯性nIB0NBSlRIN220ILlRN220Vn20IlN0I2R1RIrIB20SSdB21RRBldr2120RRrdrIl120ln2RRIlI2R1RI

7、lABCDIlL120ln2RRLK21RL0000020IttLIdIdtRIIdt2002210LIdtRItLK21RRIdtdIL002tdtRI00tIdt2021LI200202100LIdtRIIdttt221LIWmnIBVnL22221VInWmVB221VWwmmBH21221 B221HVmmdVwWVBHdV2122 RIrH0Rr2021Hwm422208RrIdVwdWmmrldrRrI2842220drrRlI34204RrvmmdVwWRdrrRlI0342041620lIlWWmm1620II2R1RI16201IWmrIB200221Bwm22208rIvmmdVwlW12212812220RRrldrrIl1220ln4RRI21mmmWWW122020ln416RRIISdtBl dELSKRIIRII2S1SLLIl dHLl dH0DRII2S1SDSDSqdtdqdtdDI dtdDdtdIDDSdtDStD DDIII传全LDIIl dHSSSdtDSdLDSISIl dH曲面，取曲面取，21HRII2S1SSdtBl dELSKSSLSdtDSdl dH(2) HE RE R(1)dtdIDDdtdDSdtdER02121221