电磁场与电磁波(西安交大第三版)第3章课后答案

1、a s r 处的速度为r J v rsss 8.5102流为1500AI1500J 1.510 A/m6S 10104J v ， eN 1.610 8.510 1.3610 C/m3J1.56v 1.361.1 m/s41030cm20m/s50AI 50 S L 0.3J166.7 A/mJ vSSJ166.7S C/m2vS U U U 0t U J UJ t U U 0得t1.12 S/m2m 由10cm 12cm和。7 dlz11 122()S22120.01 r / 0.12/ m，z1112111 16 1.12 27412 II2JIr2zzI22dz(ztan )Vzdz2RI

2、(tan ) z2 2z150A/m 质2202r222nt2tJJ，t2t 2tt123 1 1 4 4 222222222222n2tnt1111 43.37 A/m22J sin12JJ12t1J cos21 tan 0.1tan 0.0577tan 2112n11 3.302JJJE n，E 2n2nnn122212r r )J D D E E ( )J ( s2nn22n1nn01121211.5310 C/m2 10cm40cm1 S/, 2r110cm到20cm 100S/,20cm到40cm 42r2 I rIJ r rJI a r b Er2 rr11IE r cb r2rI

3、bb E dr ln Va1ra1IccV E dr lnb2rb26I2G 0.453 S31bV211a26IG S32cV222bIIG S3V1 b 1 c V V12ab12q C 0.16 C41bV1ln1aq C 0.32 C24cV2ln2bqqC 0.11 C4V1 b 1 c V V12ab12, b ,c a 10V IbIcV V a 2由上题，Vb1212IV1 b 1 c ab12V1a r b E1 b 1 crr 1ab12V1E r cb1 b 1 c rr2ab12V1 a) D (r a) E (r11 b 1 caSn1r 1ab12V1 (r21 b

4、 1 c c) D (r c) E cSn2r 2ab12V c) D (r b ) D (r b ) 1 (r2bb1 b 1 c Snn21ab12cm9cm S/m, 3r1cm到cm9cmcm到1100S/m, 42r2 I rIJ rr2JIa r b Er4 rr21IE b r crr2I 1 1( ) a bb E dr V1ra1I1 1cV E dr ( )b c2rb2I G 1Vba11I G2Vcb22IIG V VV1 1 11 1 1( )b c( )a b1212qC 11 1V1a b1qC 21 1V2b c2qqC V1 1 11 1 1V V( ) (

5、)12a bb c123, b 6 ,c 9 a50V I 1 1( )a b 2I1 1( )b cV V 由上题，V1212IV1 1 1( )a b1 1 1( )b c12V1a r bE1 1 11 1 1( )b crr2( )a b112V1E r cb1 1 11 1 1( )b crr2( )a b212V11 (rS a) D (r a) E 1 1 11 1 1( )b can1r2( )a b112V1 (rS1 c) D (r c) E 1 1 11 1 1( )b ccn2r2( )a b212V c) D (r b ) D (r b ) 12 (rS2bb1 1

6、11 1 1( )b cnn2( )a b2112d ,d d , 123, ,213E 、E 、E 123E 、E 、E 213E d E d E d V112233 EE E112233 V3E 2 d d d1231133V123 E 13 d d dd2231133V1233 E 21 d d 132313312 r J J J dSI得SI brJ22IJbrJ2IE brca2IacV Edr ln bccV2ac ln RI bc 1 ,为212 J J dSI 得JrSII Jr2J 或r2Iar bE r112Ibr cE r222 I 1 1 1 1 1 1bcV E dr E dr ( ) ( )4a bb c12ab12V1E 21 11 1r12( ) ( )a bb c12V11E 1 11 1r22( ) ( )a bb c12 V21 D (r a) E 11 11 1a1n112( ) ( )a bb c21 V11 D (r c) E 21 11 1c2s22n22( ) ( )a b b c21(V1 D D E E b22nn2211a bb c21 E 2d121133123I J S E S 123 d11123133123I G123Vd23113312