0134《 电动力学基础》西南大学20春在线作业
0134 电动力学基础1.[单选题]( )在两种均匀介质的界面处，若电磁波由介电常数大的介质到介电常数小的介质，则可能发生全反射。全反射时，折射波
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A.存在，是振幅衰减的波
B.存在，可以在另一介质中传播
C.不存在，反射回入射空间了
D.是否存在由波的频率决定
2.[单选题]下列各项中不符合相对论结论的是
A.时间间隔的相对性
B.同时性的相对性
C.因果律的相对性
D.空间距离的相对性
3.[单选题]<img title="201809201537419790562055303.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537419790562055303.jpg"/>
A.频率为w的平面简谐波
B.频率为w的球面简谐波
C.频率为w的任意平面波
D.频率w为的球面波
4.[单选题]稳恒电流的磁场是
A.F.有源无旋场
B.无源无旋场
C.有源有旋场
D.无源有旋场
5.[单选题]对于平面电磁波，下列哪一个公式正确
A.<img title="201809201537421546411059282.jpg" alt="C.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537421546411059282.jpg"/>?
B.?<img title="201809201537421527111051843.jpg" alt="A.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537421527111051843.jpg"/>
C.<img title="201809201537421568306045282.jpg" alt="D.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537421568306045282.jpg"/>?
D.<img title="201809201537421537061016571.jpg" alt="B.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537421537061016571.jpg"/>?
6.[单选题]<img title="201810161539675675675072951.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/10/16/201810161539675675675072951.jpg"/>
A.<img title="201809201537418549853047430.jpg" alt="B.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537418549853047430.jpg"/>
B.<img title="201809201537418578502074262.jpg" alt="D.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537418578502074262.jpg"/>
C.<img title="201809201537418569534095991.jpg" alt="C.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537418569534095991.jpg"/>
D.<img title="201809201537418523586084932.jpg" alt="A.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/20/201809201537418523586084932.jpg"/>
7.[单选题]位移电流
A.是真实电流，按传导电流的规律激发磁场
B.与传导电流一起构成闭合环量，其散度恒不为零
C.与传导电流一样，激发磁场和放出焦耳热
D.实质是电场随时间的变化率
8.[单选题]关于相对论以下说法正确的是
A.对于两不同惯性系,同时是绝对的
B.光速无论在介质中还是在真空中都等于
C.对所有惯性系，真空中的光速为c
D.任意惯性系中观察者观察到物体的长度都是一样的
9.[单选题]下面关于电偶极辐射的说法中，正确的是
A.若保持电偶极矩振幅不变，则辐射功率正比于频率的四次方
B.静止的电荷也会产生电磁辐射
C.在沿电偶极矩轴线方向上辐射最强
D.真空中运动的电荷都会产生电磁辐射
10.[单选题]用分离变量法，求解置于均匀外电场E0 中介质球的情况下的电势分布.以下边界条件错误的是
A.D.<img style="width: 328px; height: 78px;" title="201707201500541151691093883.jpg" alt="球表面处.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707201500541151691093883.jpg" width="351" height="78"/>?
B.?球心处电势为有限值
C.?球表面处，<img class="kfformula" src="data:image/png;base64,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" data-latex="{\phi }_{1}={\phi }_{2}"/>
D.?无穷远处电势为零
11.[单选题]关于多普勒效应,狭义相对论认为，对于运动源，地面上观察者看到的电磁波频率将
A.在运动的垂直方向上，频率减小
B.在运动的垂直方向上，频率增大
C.只在运动方向上改变
D.不会改变
12.[单选题]关于导体内外的电磁场，以下说法成立的是
A.无论什么情形外部电场总是与导体表面垂直
B.无论什么情形外部电场与总是与导体表面平行
C.稳恒电流情形下，导体内电场为0仅有磁场
D.高频电场和磁场在良导体内部为0
13.[单选题]( )在洛伦兹规范下，真空中矢势的方程是
A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf2b71a8f_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"/>
B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf2b79d0b_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"/>
C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf2b83461_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"/>
D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf2b90cbd_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"/>
14.[单选题]（ ）无限大接地平面导体，空间一电量为q的点电荷，其像电荷电量为
A.q
B.2q
C.-q
D.-2q
15.[单选题]（ ）电磁波的能量密度w和能流密度S ，以下表达式不正确的是：
A.真空中电磁场，能量密度：<img class="kfformula" src="data:image/png;base64,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" data-latex="\omega =\frac {1} {2}（{\epsilon }_{0}{E}^{2}+\frac {1} {{\mu }_{0}}{B}^{2})"/>
B.能流密度等于电场强度叉乘磁场强度：<img class="kfformula" src="data:image/png;base64,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" data-latex="S=E\times H"/>
C.平面电磁波中，<img class="kfformula" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJcAAAA6CAYAAAC9HctJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAVjSURBVHhe7ZtbyGZTGMeHJlygSUTkfCZMmhEXiBIuMDei3FKapJTDhUOJmSYuzI1SXEhJkvpyoSTHuJgRTUrJoVAOUfoohRT/n9aq1Wof3/19a7/72/9VT+/3vnudnt9+1rOe9ez9bdrkYgImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAImYAJDCdyuDpBZlINnoeX4Sl6lKfwrOX/8qZSbgY2rDOt3NMxBktfKDLcco8zBuKLXwHM8tRzYi88CvdEfgUeRMgfjujF4DTzHZzM0MIwJj4n+yGOlDIzBlr1s0QQP6znJVdX/U0Lw/FzWltU7lt7c6NMr5tSmXhcGUee8r5wBc2DB3dM26NDrU/Bc50nJSyUHJD9KnpFclAnX90i+CXUuD2AIoPOt8MNwg4eyK9n+Yg12daLfAxX6v6Lffpbclk3sWX1Pt8Lv9H17yclPYazPNUm8zhUNk72wQx36GKtwk4ekIvDGzP/YGgWeDtcfaVCQOcw19qzEckqABtgjWyzjJ11n66kqY+eZhhhXXDj7OiyuJk4fNPBZ00U3hW0RhS8IWu/X5+8tBL7S9V8q6mBwbJN5DLamQNexs3ND3+81jPFHcu2YinosroclX6/jPCfXNW6e1Vjl7o/ItCGmyAuGxYodqzB+TAUsmhKIW94NDUpwjf7x3nkZ22uPxb51XLYCoOVgT9NvQE/LXRW95YZVt222TmTEChgMDM6qmcPmsICoc0tWJ9+Op6h/L/R4nOOCAKauELzG1Y4xpYWTUQ4y7ycPXgE7NbjoXeeR0Bd+MVH6YAXInEGxRGovixhYGQgYBHHRbsm1QZqMK2bYc1e/VW05PRHo1pU0M51uSwPVKN48bncvZCPDjbQM6ZV3JdsqZpZvx8WeVJRMJh4lxd+UrEpulvza8Rbdq3pPSj6RvJG0IYbg5Ng3wVo3LDfppY5zyqt9rx+uWbBtl2ZPqNJ9EhZLyoC2J0ruCHMnB8iCm1Vhhb0lYdXkW1sbiLdDu6o4Il/JbX1N9XrM8dV5aRYunp3DDH8vRSnlua6Xtq9LXpXkAXfVySbCwTP9Fr6crc8vEmp4ipMlaWrhHH3/QdKWrlhv+Fs1wI6egxxQ/ZWKNsScMPpLcrjkn5p+OUk/Ktkleajn2JOuHo/R90uLGGd1ibd4TFEXyJ6pa8cnVPCOn0qa4rcpQqyLt3JdCBNgNWbKZRS+KNx0jK6b1J2hXZ5uqKqPd7x7gHYYZTy99v08esC4bU1jjq/tsREevFiw3jZprpfaFjGOnZIzJH2ywyuqf5PkVsnLDQphGAT8GBjB9SKFWLDtBtb1ywPjvYsM2qENOb5LgnxUU/+EwPXQlnodhpteFW46q6pPfgWDiQ9qm9IN0HhcMtXHOk13M83x1W336WFp0cUxPYvKZswxmhNjCulUfd9Ro9llwSCbjtZ4whdDPepvtBLjrZUaxXjV6GPJquS6ZVO+1LYY9b5Sf3DK4wS4RfJ+MLj0BERei/exCNhj+bICHCfFQ8LvvGFK7myjFPJaeOuTgkJ/6/PbTDn4rEh4kI3MLr+1UW72WuiB507DAr9XtRZU3cf/BIg505IbmzGZwEIEql75wdim9gC9l/JTeVmwl1JLWJkt8PlkXhgVD5v7pGWWUK3mKdm4ytwy3oBNDSk1tj7pmTKz9SiTIpDm+OIrREPep5+E8vZc63+b2AL3SvhnVIyM/xkkP8fbHi4mMIjAbN9dt+caZDedGufxVqdGrmQCXQjk+a0ubVzHBEzABEzABEzABEzABEzABEzABEzABEzABEzABEzABEzABEzABJaNwH8r0u3+7XoGqgAAAABJRU5ErkJggg==" data-latex="\epsilon {E}^{2}=\frac {1} {\mu }{B}^{2}"/>
D.
能流密度等于能量密度乘传播方向单位矢量：<img class="kfformula" src="data:image/png;base64,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" data-latex="S=\omega n"/>
16.[单选题]在真空中传播的平面电磁波，以下正确的是：
A.沿x轴传播，场量E和B的值仅与x、t 有关。
B.其电场不满足亥姆霍兹方程。
C.电场E的方向与传播方向相同。
D.其传播速度c 小于<img class="kfformula" src="data:image/png;base64,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" data-latex="\frac {1} {\sqrt {{{\mu }_{0}\epsilon }_{0}}}"/>
17.[单选题]矩形波导管的边长分别为a和b, 且a＞b,则波的截止波长为
A.2a
B.2b
C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf25433ae_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"
D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiDe2c92e57_14bf254ba98_USL&rc=3aqKG7odjMC9EAhsQ7JFAg%3D%3D"
18.[单选题]（ ）动量流密度是张量，其中一个元素Tij是指
A.流过垂直于轴i的单位投影面的动量的j分量
B.流过单位面元垂直于j轴的投影面的动量的i分量
C.流过面元j的动量的i分量
D.流过面元的i动量的j分量
19.[单选题]导体空腔静电屏蔽可由静电场的唯一性定理解释__________
A.内部不受外部影响，因为内部空间的电荷分布确定，内表面边界电势确定
B.内部不受外部影响，因为内部空间的电荷分布确定，内表面边界的电荷量确定
C.接地的导体空腔外部不受内部影响，因为空腔外表面电荷量确定
D.接地的导体空腔外部不受内部影响，因为内部空间的电荷分布确定
20.[单选题]（ ）无限大接地平面导体，其像电荷有几个
A.1
B.2
C.3
D.4
21.[单选题]（ ）以下边值关系正确的是
A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDx2c92e57_14bef00bfbb_USL&rc=3aqKG7odjMDF5RFjpOZaHQ%3D%3D"
B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDx2c92e57_14bef01570e_USL&rc=3aqKG7odjMDF5RFjpOZaHQ%3D%3D"
C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDx2c92e57_14bef01edba_USL&rc=3aqKG7odjMDF5RFjpOZaHQ%3D%3D"
D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDx2c92e57_14bef027ba0_USL&rc=3aqKG7odjMDF5RFjpOZaHQ%3D%3D"
22.[单选题]（ ）均匀电场中有一均匀介质球，则介质球上的极化电荷在球内空间的电场为
A.0
B.均匀电场
C.偶极子的电场
D.电四极矩的电场
23.[单选题]电磁场的规范变换式充分表明
A.一个场量或可与多个标势或矢势相对应
B.一个电磁场量对应一标势和多个矢势
C.标势和矢势对于同一电磁场是唯一性
D.一个标势或矢势可与多个场量或相对应
24.[单选题]是测量光速沿不同方向的差异的主要实验，其结果否定了“以太”的存在
A.伽利略单摆实验
B.牛顿棱镜色散实验
C.迈克尔逊-莫雷实验
D.卡文迪许扭矩实验
25.[单选题]<img style="width: 901px; height: 62px;" title="201707201500539158631010988.jpg" alt="在自由空间.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707201500539158631010988.jpg" width="976" height="57"/>电磁波
A.该电磁波的磁场沿z方向.
B.<img class="kfformula" src="data:image/png;base64,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" data-latex="\beta \omega "/>该电磁波的相速为
C.该电磁波的电场方向在xoy面内，与x轴成45°
D.该电磁波的传播方向为沿y轴.
26.[判断题]<img title="201707111499760630854037130.jpg" alt="4.2.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707111499760630854037130.jpg"/>
A.正确
B.错误
27.[判断题]矩形波导管中传播的<img style="width: 64px; height: 32px;" class="kfformula" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAAAuCAYAAADeIbxeAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAANMSURBVHhe7ZlLqE5RFMevR5KQRB6RZxRRIjERhZLIDLOrDAxIBkoGuiNTE5JSYiBDlMJEeaTbLSKJQihhQB4Tovj/a+067fZ5n7vPd7/vv2q1v2+v/Vq/fc46a5/T1ycRAREQAREQAREQAREQAREQAREQAREQAREQgZFBYFTkZa7EfFdszp8oP9nviShn2e+vKL/Y75koJ9nvoyhvBNa7GXWHoPOg48z+HuVvr23Sfh22Y5F978jpTmBVr6CLvdVxo/5Bf0HHerY1ZtuU49F+a3cpo906m+NUR9JpYVG8IxYG5t2XA3MQ9kU56+VGcFO5MVlyBsYDLfheaMrRhVo104h3wXnom8Bw7uq/mzLVH9S/y1nGVrM/yWn3GHY/nDXjYQOjxNwQAruWsuY8mJPR72+Gv0tgm2H2lzlcGBLfNsBuWIaIuSHT4MFQwIskTF69Ibmd4/0qs99B+cNrO4D/ExJ1S/H7w7DQ7JJBd8MPxv6rNfzhQ5pjMGlICu+GpzXGjd415h2S5hwzH8r9Gt5vs74PvTH68f9mjXF7susLu7o3VPR+vvXnHXIOetL0ltXvqDhuT3ZLwuSDu4oQODeDqXFSeNBkfSjN9udhqhxKl5n9RT2ztB2yVhiZByj9h3HRzXEPdP8U/xEDfIaG0mw3NoFz05Z7k/HMw/qdRRfRVLu2N8TBzMuisvzdbkY/Q5uD+rNeRyYQVCfMyvj6iK9SkvLa6k83BXqkjMMwwytxS8UF8+zB/lR3Dskaiml3KDTyTgmFLN4pPROyCHCt0auami6z/jwMMjxlCaHzQV81NFa8Zsp1azNklYGZ5tVqM/ghx28/HhUXoZfL4Ynfus0NKQozi8ouM97LaDQdNj7wn0Gfx0dcbsYx5ZrXas3YvRHKV+97oQNQnqRZ/x06G8oLhN9DsmQujOuhe6D91pBZ2lQbm+NTGaKOQy9AF0APQ/nqPyS0s/8jz8g6hlWGuigS+wMVPzhRvkH57YPCTeF7Lr8+DQDDz5QKdNzHsFBXbh4f4HwbnRTWHYQeqTCfutQg0DFZVg0fuqKrOwC61Jml+zaTrCvy4asrgMgJERABERABERABERABERABERABERABERABERABERCBJgj8BxOpgZMBHdPtAAAAAElFTkSuQmCC" width="78" height="37" data-latex="{TE}_{11}"/> 和<img style="width: 70px; height: 35px;" class="kfformula" src="data:image/png;base64,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" width="80" height="38" data-latex="{TM}_{11}"/> 波的截止频率相同
A.正确
B.错误
28.[判断题]麦克斯韦方程在四维量下是协变的。
A.正确
B.错误
29.[判断题]全反射时，折射波是隐失波。
A.正确
B.错误
30.[判断题]<img title="201809271538015610785031446.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/27/201809271538015610785031446.jpg"/> 答案可以联系QQ 76 12 960 21
A.正确
B.错误
31.[判断题]在相对论中，三维空间与一维时间构成一个统一体，不可分割，当参考系改变时，时空坐标相互变换。相应地，电磁场的三维矢势和一维标势构成一个统一体，不可分割。当参考系改变时，矢势和标势相互变换
A.正确
B.错误
32.[判断题]在相对论中，物体能量包含动能和静能。
A.正确
B.错误
33.[判断题]<img title="201707121499859539846030138.jpg" alt="结合能与质量亏损的关系为.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707121499859539846030138.jpg"/>
A.正确
B.错误
34.[判断题]在静电情况，导体是个等势体，电力线总是平行于导体表面
A.正确
B.错误
35.[判断题]球对称电荷分布没有各极电多极矩
A.正确
B.错误
36.[判断题]<img title="201707121499854714825076200.jpg" alt="四维矢量在洛仑兹变换下满足.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707121499854714825076200.jpg"/>
A.正确
B.错误
37.[判断题]研究静电场问题总是可以把无穷远点作为电势零点
A.正确
B.错误
38.[判断题]无穷大平行板电容器内有两层介质，极板上面电荷密度相同，但电荷种类不同。此时不同介质内的电位移也不同
A.正确
B.错误
39.[判断题]在均匀介质中传播的时谐平面波的电场和磁场的振幅比为电磁波的传播速度
A.正确
B.错误
40.[判断题]<img title="201809271538015562950080283.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/27/201809271538015562950080283.jpg"/>
A.正确
B.错误
41.[判断题]在牛顿力学中和在相对论中，同时性都是绝对的。
A.正确
B.错误
42.[判断题]采用不同的规范条件，得到的电磁场也不同
A.正确
B.错误
43.[判断题]电磁波从光疏媒质入射到光密媒质时，可发生全反射现象
A.正确
B.错误
44.[判断题]在两介质的界面处，磁感应强度的法向分量总是连续的
A.正确
B.错误
45.[判断题]跨过介质分界面两侧，电场强度E 的切向分量一定连续
A.正确
B.错误
46.[判断题]牛顿力学是相对论力学在一定条件下的近似
A.正确
B.错误
47.[判断题]物体处于超导态时，除表面很薄的一层外，其内部一定没有磁场
A.正确
B.错误
48.[判断题]在矩形波导管中可以传播TEM波。
A.正确
B.错误
49.[判断题]<img title="201707121499854076087078113.jpg" alt="良导体条件为.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707121499854076087078113.jpg"/>
A.正确
B.错误
50.[判断题]一般情况下，线性均匀导电媒质的介电常数是一个复数
A.正确
B.错误
51.[判断题]在任何情况下传导电流线总是闭合的
A.正确
B.错误
52.[判断题]<img title="201707121499859443167051459.jpg" alt="四维动量表示为.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201707121499859443167051459.jpg"/>
A.正确
B.错误
53.[判断题]<img title="201809271538017152131058560.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/27/201809271538017152131058560.jpg"/>
A.正确
B.错误
54.[判断题]高斯定理的微分形式反映空间电场只和该点上的电荷密度有关，而和其它地点的电荷分布无关
A.正确
B.错误
55.[判断题]电磁波中的电场能一定等于磁场能
A.正确
B.错误
56.[判断题]亥姆霍兹方程对所有形式的电磁波均成立
A.正确
B.错误
57.[主观填空题]经典电磁理论认为超导体完全抗磁性的来源是因为超导电流产生的磁场在超导体内完全抵消外磁场。超导电流只分布在超导体________________________
A.
58.[主观填空题]电偶极辐射的功率正比于频率的______________________
A.
59.[主观填空题]静电场的泊松方程是____________________________
A.
60.[主观填空题]狭义相对论的相对性原理是指一切物理规律对__________________
A.
61.[主观填空题]写出磁场和矢势的关系_____________________
A.
62.[主观填空题]电磁场的E和标势及矢势的关系____________________________
A.
63.[主观填空题]真空中静电场的旋度方程是____________________
A.
64.[主观填空题]狭义相对论认为动系的尺子将_____________________________
A.
65.[主观填空题]平面波波矢的方向和电场的方向及磁场的方向 ________________________
A.
66.[主观填空题]静电场的泊松方程___________________
A.
67.[主观填空题]狭义相对论认为同时是_____________________________
A.
68.[主观填空题]狭义相对论的基本假设中，相对性原理是___________________________
A.
69.[问答题]电荷Q均匀分布于半径为a的球体内，求各点的电场强度，并由此直接计算电场的散度．
A.
70.[问答题]<img title="201810161539675010689003893.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/10/16/201810161539675010689003893.jpg"/>
A.
71.[问答题]由麦克斯韦方程组导出电流连续性方程。
A.
72.[问答题]1.有一点电荷 Q 位于两个互相垂直的接地导体平面所围成的直角空间内，它到两个平面的距离为a和b，（１）写出用电象法求空间电势时，需放置的像电荷的位置和电量；（２）写出空间的电势分布。
<img title="201809291538204929462000601.jpg" alt="0.jpg" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2018/09/29/201809291538204929462000601.jpg"/>
A.
73.[问答题]S系中有一静长为L0的管子沿x方向以速率v运动,从管尾向前射出一高速粒子,
它相对管子的速率为u,求它到达管子前端所需的时间.
A.
74.[问答题]一平行板电容器两极板相距为d，其间为空气，已知一极板电势为零，另一极板电势为U(如图)，略去边缘效应，试求两极板间的电势，并由求电场强度．
<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDw2c92e57_14be46b4465_USL&rc=3aqKG7odjMAieLkB0J2PYQ%3D%3D"/>
A.
75.[问答题]静止μ子的平均寿命是<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiDw2c92e57_14be4082c67_USL&rc=3aqKG7odjMAieLkB0J2PYQ%3D%3D"/> 在实验室里，从高能加速器出来的μ子以0.6c运动，⑴在实验室中观察，这些μ子的平均寿命是多少？
⑵它们在衰变前飞行的平均距离是多少？
⑶相对于μ子静止的观察者观测到它们衰变前飞行的平均距离是多少？
A.
76.[问答题]证明导体和介质的交界面处，静电情形电场与导体表面垂直；有稳恒电流时，导体内电场与导体表面相切。
A.
77.[问答题]证明在一个惯性系中，物体的速度小于光速，则在任何惯性系中，物体的速度都小于光速。
A.
78.[问答题]证明平面电磁波是横波，并且有电场、磁场和传播方向成右手螺旋关系。
A.
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