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1、优秀学习资料欢迎下载第 7 章电磁感应电磁场7-1 ac 间电势差等于其电动势lBvd)(端电势高cVbcBbcbcabacV1088.1215.11.0105.260cos327-2 解：lBvd)(先求0b，在 ob 上任取rr d,d上的)(Bv方向如图则lbBlrrBrvB3202092d0cosd90sin同理18d23100BlrrBla端电势高bBlBlBlabba222006118927-3 如右图所示，设B 的方向垂直小面积a2向下。当圆盘逆时针转动时，磁场区产生感应电动势BarBai因此，在此小区域形成沿径向流向盘心的感应电流RBarRIiiR 为小面积a2的电阻，由图示可
2、知tBarItataRi11此电流 Ii在磁场中受到磁力为traBBaIfi22显然力 f 与转速反向，为一磁阻力，故磁阻力矩为traBrfM222习题 7-1 图习题 7-2 图习题 7-3 图-第 1 页，共 15 页精品p d f 资料 可编辑资料-优秀学习资料欢迎下载7-4 见图示，在圆弧ab上取一线元dl，由于切割磁力线产生动生电动势lVBlBVddcosd)(为BV与ld之间的夹角，由图示几何关系可知：sin,dd,2RrRldsindsindsind22BRBRrVBR则ab上的动生电动势为24/024/02282d22cos1dsindBRBRBR的方向为ba7-5 设 t 时
3、刻半圆形导线的法线与B 构成角，因匀角速旋转，故ftt2，此时，通过半圆形部分的磁通量为ftrBtBS2cos2cos2该电路中产生的感应电动势为ftfrBt2sindd22感应电流为ftRfrBRI2sin22其最大值为电流幅值RfrBIm227-6 设 t 时刻圆形导线的法线与B 构成角。tNBStNtBsftsinddcos602习题 7-4 图-第 2 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A
4、7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S
5、9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R
6、10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2
7、H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX
8、5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G
9、3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编
10、码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7优秀学习资料欢迎下载V7.16012.0105.01042442maxrNBNBS7-7 解法（一）设 t时刻时，AD 边离电流 I 的距离为 y，y 是时间的函数。在矩形线圈内取面元xlSdd1，电流 I 产生的磁场穿过dS的磁通量xlxISdBdd210则yylIlxxIllyy21010ln2d2d2)dd()(2dd)11(2dd2210210
11、vtyvylylIltyylyIlt当m10.0ay时V106.105.009.004.003.006.05102)(2872210alavlIl其绕行方向为顺时针方向。解法（二），线圈 4 个边中仅有平行电流I 的两个边切割磁力线而产生电动势，在t 时刻近电流I 的一边产生电动势aIllB2101111的方向向上。同理，t 时刻远电流边产生的电动势为)(2210122alIllB2方向向上。故线圈中的电动势为alaIl21021112习题 7-7 图-第 3 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7
12、文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:C
13、Y7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2
14、L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 H
15、P4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J
16、4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10
17、 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6
18、I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7优秀学习资料欢迎下载alalIl)(2221021结论同解法（一）。7-8 取如图示之坐标轴ox，在金属杆上取线元dx，两个长直等值反向电流在dx 处产生的磁感强度xaxIB21120则 dx 上产生的动生电动势为xxaxIxBd2112dd0故金属杆
19、上的动生电动势为babaIxxaxIbabalnd2112d00金属杆在左端电势高。7-9（1）在矩形线圈内取一面元dS=ldx，此面元处的磁感强度据题设可得xdbxIB1120B 的方向垂直纸面向里。故穿过线圈内的磁通量bbaddaIldabbdaIlbabddaIlxxdbxIlSBabb)()(ln2)()(ln2lnln2d112d0000线圈中的感生电动势为tIdbabadltdd)()(ln2dd07-10 设 t 时刻杆 CD 位于 Y 处，这时CD 杆与抛物线相交的两端长为kyx22，此时杆向上运动的速度据题设应为ay2，故此时回路中的电动势即为杆长2x 内切割磁力线所产生的感
20、应电动势，即习题 7-8 图习题 7-9 图-第 4 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6
21、G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档
22、编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7
23、A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9
24、S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4
25、R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J
26、2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7优秀学习资料欢迎下载kaByaykyBxB8222的方向由D 指
27、向 C。7-11 两个半圆面内穿过的磁量为BRRBBS222245cos22cos2故回路内的感应电动势的大小为tBRtdd22dd2由于磁场在t秒均匀降为零，即tBtBddV1089.8105108)105(2222232222tBR顺时针方向。7-12（1）过 a 点作一半径为r 的圆形回路L，则涡旋电场iE沿 L 的环流为liStBlESd-d由于磁场沿轴线柱对称，帮L 上iE量值相等，且iE方向即与L 绕行方向相同。StBrEiddd21422mV15.2)100.1(2105dd2tBrEi0ddtB，故iE的方向为顺时针绕行方向。（2）在 a点放一电子的加速度maeEmaFi,27
28、43119sm104.4105.2101.9106.1meEai由于电子荷负电，故它的加速度方向与iE相反。7-13 根据磁场B 柱对称，当0ddtB时，可知iE为一系列同心圆，即iE与半径正交，故-第 5 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编
29、码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A
30、7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S
31、9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R
32、10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2
33、H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX
34、5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G
35、3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7优秀学习资料欢迎下载沿半径方向不会产生感生电动势，即0ocoboa，这样在回路oac 中的电动势为acbcabcabcaboaoacac为杆为 ac 内的电动势，ab和bc分别为 ab 和 bc 部分内的电动势。由上面分析可知tBStBSobcbcoababdddd211S为三角形oab的面积，据题设，221,43SRS为obc回路内磁场复盖的区域cob扇形面积，据题设，图中6，故2221221RRStBRtBSSbcabacdd1243dd)(221因为0ddtB，由楞次定律可判定c 端电位高。7-14
36、 由于abc回路内有效磁场变化区为ab弦与螺线管壁之间包围的面积0S，据题设，3/boa，故tBRtBSRRRSabcabdd436dd43643321202220abctB,0dd中绕行方向为逆时针，故a 端电势高。7-15（1）矩形螺绕环内的磁感强度可由安培环路定理计算rNIBNIrB2200穿过每匝线圈的矩形面积内的磁通量（见图示）为习题 7-13 图习题 7-15 图-第 6 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G
37、3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编
38、码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A
39、7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S
40、9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R
41、10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2
42、H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX
43、5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7优秀学习资料欢迎下载baNIhrrhNISBbaln2d2d00因此螺绕环的自感系数为abhNINLln220（2）环内磁能为abhINLIWmln42122027-16 图示一平面螺线，共有N 匝，在距圆心r 处取 dN 匝圆形线圈，其宽度为dr，当 B 变化时，在dN 匝圆形线中产生感生电动势rtBaNrNtBrNtBSdd
44、dddddddd22则整个平面螺线中产生的感生电动势为tNBatBNarrtBaNacos3dd3dddd022027-17 设二导线通有等值反向的电流I，在二导线间坐标x 处取一面元xlSdd，则长为L的二导线间构成一回路，略去导线内磁通，故穿过该回路的磁通量应为aadIlxlxISBadalnd22d00由此可得，长为l 的这一对导线的自感系数为aadlILln07-18 设在磁控管的空心圆柱面和平行板间穿过的磁通量分别为1与2，设若通过的电流为 I，由于da，二平行板可看作二无限大载流平面，见图示，其面流电aIK，故二板间的磁感为aIKB001，而空心圆柱习题 7-16 图习题 7-17
45、 图习题 7-18 图-第 7 页，共 15 页精品p d f 资料 可编辑资料-文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY
46、7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L
47、9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP
48、4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4
49、J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10
50、ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I6G3B7文档编码:CY7A7Z2L9S9 HP4R10J4J2H10 ZX5K6I