8.
?? ?03?99.9.42?10 V/m;5?10 C 10.?r;1 ;?r 三、计算题 1.(1)?1??6=
Q1?Q2?Q3Q?Q2?Q3Q?Q2?Q3,?2???3=1,?4???5=1;
2S2S2S(2)Ea?Q1?Q2?Q3Q?Q2?Q3Q?Q1?Q2,Eb?1,Ec?3
2?0S2?0S2?0S2.(1)V1?V2?q?Q,U?0;
4π?0R3(2) V1?q?11?q?11?V?0,,?U???2???
4??0?R1R2?4??0?R1R2?Qd21 ; Q,QB??Q,VC?3?S3303.(1)QA??(2)QA????2QdQ,QB???rQ,VC?? 2??r2??r?0(2??r)S4.(1)80V;(2)15 V 5.(1)D??0?rU?rUU,E? ,E0?;
?ra??1??r?b?ra??1??r?b?ra??1??r?b(2)C??0?rS
?ra??1??r?b第七章 恒定磁场
一、选择题
1.B,2.C,3.A,4.C,5.A,6.C,7.D,8.C,9.D,10.D,11.A,12.C,13.B,14.B,15.D,16.C,17.D,18.B,19.C,20.B,21.A,22.C,23.A,24.C,25.D,26.A,27.D 二、填空题 1.B??0I4πR;方向垂直纸面向里
2.
2π 8119
3.B??0ev4πr02;I?ev1;pm?evr0 2πr024.B??0q?2πR5.B?0
?Ia?b6.0ln 2πab7.πrBcos? 8.0
2
()9.? 0I2-2I110.Oc
11.0,1.5?10N/cm,1.5?10N/cm 12.3.98?10 三、计算题 1.B0?2?6?6?0NI4R,B0的方向沿x轴正向
;(2)d?2.(1)F??0I2π2RπR 23.Bp??0Id2?(R2?r2)
4.(1)Fab??II?IId?ld?l3?0lI1I2,Fbc?012ln,Fca?012ln;
2πdπd2π(d?l)(2)?m?5.Pm?3?0I1d?l(l?dln) 2πd11?qR2; M??qR2B ,磁力矩的方向垂直向上 44?423?36.(1)v?6.7?10(m/s),(2)n?2.8?10(cm),(3)霍尔电压的极性,如图所示。
120
zdIObyB
x
第八章 电磁感应 电磁场
一、选择题
1.D,2.C,3.D,4.A,5.A,6.C,7.C,8.C,9.C,10.B,11.A,12.D,13.A,14.B,15.B,16.C,17.D,18.D,19.D,20.D 二、填空题
1.0.128π;?0.5m/s 2.3.18T/s 3.
2dBiR? dtS4.向右移动 5.0
26.??0,Va?Vc??B?l/2.
7.L1:L2=1∶2,Wm1:Wm2=1∶2 三、计算题
231.?i?vttan?,?i的方向为逆时针方向
2.(1)UOM?3.?OA12?aB;(2)UON?3?a2B/2;(3)O点电势最高 2??Ib?L?0(L?bln),电动势?OA的方向从O指向A,即A点电势高
2πB4.(1)?m??0Ix2πlnr0?l?Ivr?l?Ir?l2v);(2)Ii??0ln0;(3)F?(0ln0,方向垂直
r02πRr02πr0R
于cd导线向上
第九章 振动
一、选择题
1.C,2.C,3.B,4.B,5.D,6.C,7.C,8.D,9.A,10.B,11.C,12.B,13.C,14.D,15.C,16.C,17.B,18.B
二、填空题
121
1.??1k1?k22πm ?2-12.??4Hz,vm?8π?10m?s,??π 63.12s 4.?5π 65.1/2s 6.10cm,?π 27.x?5?10cos(2πt?0.545π) (SI) 8.??2kπ?三、计算题
1.(1)E?0.16J;(2)x?0.4cos?2πt??222π,Amax?14?10?2m,??(2k?1)π?π,Amin?2?10?2m 55??π???SI? 3?2.(1)x??0.087m;(2)t?1s;(3)?t?3. A2?0.10m,????2??1?2s 3π 22A 2x??v??0.3m?s?1,4.(1)(2)(3)(4)F?0;x?0,a?0;Ek,max?2.25?10?3J;
5.(1)证明略;(2)??kmg2kh2kh,A?,??arctan 1?M?mk(M?m)g(M?m)g第十章 波动
一、选择题
1.C,2.D,3.C,4.B,5.C,6.B,7.B,8.A,9.C,10.A,11.B,12.D,13.C,14.C,15.A,16.D,17.C,18.A,19.D, 20.B 二、填空题 1.1/2,1/2,0.05 2.-1
3.0.02cos(10πt?πx?π)m 3?[t?(x?l)/u]??0? 4.y?Acos? 122
5. 0.5 m,y0?0.05cos(40πt?) ,y?0.05cos(40πt?4πx?6.y?Acosπ2π) 2???t?(x?b)/u????.
07.y?Acos[?(t?x/u)?π] 8.yP?0.01cos[2π(t?2)?π/3]m 9.0.233m 10.A1/A2?2 11.2.0?10cos[2π(12.π
13.A?0.02 m,u?40m/s, ?x?三、计算题
1.y?3.0?10?2cos?50π?t??2tx4π?)?] 0.02203πm 20????x?π????SI? 6?2??2.(1)A?0.05m,??50Hz,??1.0m,u?50m/s;
32(2)vmax?15.7ms,amax?4.39?10ms
3.(1)??12245x2(2)y?0.01cos[4π(t?)?π]m m,u?m/s;
552434.(1)y?Acos?2π(250t?x/200)?π/4?(SI);
(2)y1?Acos(500πt?5π/4)(SI),v??500πAsin(500πt?5π/4)(SI) 5.(1)yp?Acos?πt/2?π??SI?;(2)y?Acos?2π????tx?d?????π??SI?
????4π2ππ); (2)y?Acos(?t?x?); 2?22ππ(3)y反?Acos[?t?(2L?x)??π];(4)减弱
?26.(1)y0?Acos(?t?第十一章 光学
一、选择题
1.D,2.C,3.B,4.A,5.B,6.A,7.C,8.B,9.C,10.D,11.C,12.C,13.B,14.D,
15.B,16.C,17.B,18.B,19.C,20.A,21.C,22.C,23.A,24.B,25.B,26.A,27.C,28.D,29.A,30.C,31.D,32.D,33.C,34.C,35.B 二、填空题 1.3?,1.33 2.1.5?
123