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简答题 如图所示,有一长
的带电细杆,电荷均匀分布,线密度为
.求:⑴杆上距原点x处的线元dx对P点的点电荷
的电场力;⑵受的总电场力;⑶若
,
,则P点的电场强度是多少?
学科：大学物理A上-2023春季学期
时间：2023-07-03 14:35:12
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题目1单选题
正方形的两对角上,各置电荷<img src="https://tihai-oss-cloud.itihey.com/img/837088b880ab944cac53b231d0cd15e2.png">,在其余两对角上各置电荷<img src="https://tihai-oss-cloud.itihey.com/img/7412985d0ba37b933fde78747e4169d6.png">,若<img src="https://tihai-oss-cloud.itihey.com/img/837088b880ab944cac53b231d0cd15e2.png">所受合力为零,则<img src="https://tihai-oss-cloud.itihey.com/img/837088b880ab944cac53b231d0cd15e2.png">与<img src="https://tihai-oss-cloud.itihey.com/img/7412985d0ba37b933fde78747e4169d6.png">的大小关系为 [ ]A. <img src="https://tihai-oss-cloud.itihey.com/img/b25bda4b223cf6b903bd87bb71a6a419.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/2db72873d16b6e69499e47dba81320f0.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/3669a8871b90ab760830218548e65599.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/b60031172a30716e5159e9daa21ae750.png">
题目2单选题
空间某处附近的正电荷越多,那么有[ ]A. 位于该处的点电荷所受的力越大B. 该处的电场强度越大C. 该处的电场强度不可能为零D. 以上说法都不正确
题目3单选题
一个带负电荷的质点,在电场力作用下从A点出发经C点运动到B点,其运动轨迹如图所示.已知质点运动的速率是递减的,下面关于C点场强方向的四个图示中正确的是 [ ]A. <img src="https://tihai-oss-cloud.itihey.com/img/668a38bdece5c8417c09e69384aa9a83.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/93e8d7b41ccb1944a641b178ae812c5a.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/74c5e56b649afe7a4ff14b665ed6c676.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/7dee9a05eccc316e9cd1a163650442ed.png">
题目4单选题
闭合曲面<img src="https://tihai-oss-cloud.itihey.com/img/2d44d72acf9ae7be7c0ea7bf7b7dbab7.png">包围点电荷<img src="https://tihai-oss-cloud.itihey.com/img/09ae1c8b7aa44dc11a18c5c63a7dd64c.png">, 现从无穷远处引入另一点电荷<img src="https://tihai-oss-cloud.itihey.com/img/7412985d0ba37b933fde78747e4169d6.png">至曲面外一点,如图所示,则引入前后[ ]<img src="https://tihai-oss-cloud.itihey.com/img/116dc5fe980bffdd4bc6c76e1d1ad8ac.jpg">A. 曲面 <img src="https://tihai-oss-cloud.itihey.com/img/2d44d72acf9ae7be7c0ea7bf7b7dbab7.png">的电场强度通量不变,曲面上各点电场强度不变B. 曲面 <img src="https://tihai-oss-cloud.itihey.com/img/2d44d72acf9ae7be7c0ea7bf7b7dbab7.png">的电场强度通量变化,曲面上各点电场强度不变C. 曲面 <img src="https://tihai-oss-cloud.itihey.com/img/2d44d72acf9ae7be7c0ea7bf7b7dbab7.png">的电场强度通量变化,曲面上各点电场强度变化D. 曲面 <img src="https://tihai-oss-cloud.itihey.com/img/2d44d72acf9ae7be7c0ea7bf7b7dbab7.png">的电场强度通量不变,曲面上各点电场强度变化
题目5单选题
关于真空中静电场的高斯定理:<img src="https://tihai-oss-cloud.itihey.com/img/7965061f7b42cad82a50b80e4ff06e66.png">下述哪种说法是正确的?[ ]A. <img src="https://tihai-oss-cloud.itihey.com/img/5b6751d29dbb745c2066d0a46fc402f9.png">不仅与高斯面内的电荷有关,而且还与高斯面外的电荷有关B. 积分式中的<img src="https://tihai-oss-cloud.itihey.com/img/7bae1734d22e770bf84a7ef509fb127e.png">一定是电荷<img src="https://tihai-oss-cloud.itihey.com/img/49ab9d62892bd2fa5997470c1ec340ee.png">所激发的C. 积分式中的<img src="https://tihai-oss-cloud.itihey.com/img/7bae1734d22e770bf84a7ef509fb127e.png">是由高斯面内、外所有电荷共同激发的D. <img src="https://tihai-oss-cloud.itihey.com/img/102b0d4c83d8f74ce81f92910c174a20.png">是空间所有电荷的代数和
题目6单选题
在边长为a的正立方体中心有一个电量为q的点电荷,则通过该立方体任一面的电场强度通量为:[ ]A. q/ε0B. q/2ε0C. q/4ε0D. q/6ε0
题目7填空题
半径为<img src="https://tihai-oss-cloud.itihey.com/img/4bc6c4c510b505dd7c86ac8542cb94aa.png">的半球面置于场强为<img src="https://tihai-oss-cloud.itihey.com/img/db1e6c37b65f12791d040c0d826cbcea.png">的均匀电场中,其对称轴与场强方向一致,如右图所示,则通过该半球面的电场强度通量为____.<img src="https://tihai-oss-cloud.itihey.com/img/27ce55fe05ce9b0fe4f55cea2fa0487d.jpg">题目8简答题
一个细玻璃棒被弯成半径为<img src="https://tihai-oss-cloud.itihey.com/img/6b6454d6bf2cfa05dfe4f80ae8efa187.png">的半圆形,沿其上半部分均匀分布有电荷<img src="https://tihai-oss-cloud.itihey.com/img/feeba3955f5d53b464a365fdece3775e.png">,沿其下半部分均匀分布有电荷<img src="https://tihai-oss-cloud.itihey.com/img/383c2039587212328ce36645c49cd86e.png">,如图所示.试求:(1)圆心<img src="https://tihai-oss-cloud.itihey.com/img/3008725c1b05b4301b168f60b0176f85.png">处的电场强度;(2)电场强度的方向.<img src="https://tihai-oss-cloud.itihey.com/img/c732b5a46937732dd8c91e6045bc720f.jpg">题目9简答题
如图所示,有一长<img src="https://tihai-oss-cloud.itihey.com/img/48c49a48138d4881338dcd35aa8b0480.png">的带电细杆,电荷均匀分布,线密度为<img src="https://tihai-oss-cloud.itihey.com/img/b3fb9996cbcbcd94883b62017962689e.png">.求:⑴杆上距原点x处的线元dx对P点的点电荷<img src="https://tihai-oss-cloud.itihey.com/img/263d756d197817a543b84cdabaf3fcde.png">的电场力;⑵<img src="https://tihai-oss-cloud.itihey.com/img/263d756d197817a543b84cdabaf3fcde.png">受的总电场力;⑶若<img src="https://tihai-oss-cloud.itihey.com/img/bcf95405db0b1c7d0443e1b1fdc6af40.png">,<img src="https://tihai-oss-cloud.itihey.com/img/987ca218f0cc6ea88670c3a0528a82aa.png"> ,则P点的电场强度是多少?<img src="https://tihai-oss-cloud.itihey.com/img/334b946214c5aeb833b26ce2f54aad8e.jpg">题目10简答题
真空中两条平行的无限长均匀带电直线相距为<img src="https://tihai-oss-cloud.itihey.com/img/84586cc8cd279b544ba5113cca1923ab.png">,其电荷线密度分别为<img src="https://tihai-oss-cloud.itihey.com/img/2d892b46c8e45c418c257949088260c9.png">和<img src="https://tihai-oss-cloud.itihey.com/img/e0fd703a1f11bdd5f5fd1aa86db9ddbe.png">.如图,取两直线的中点为坐标原点,两直线所在平面上向右为<img src="https://tihai-oss-cloud.itihey.com/img/067aca5ae44d6c6d3d9b0eadf0fea91b.png">轴正方向,试求:⑴在两带电直线间<img src="https://tihai-oss-cloud.itihey.com/img/067aca5ae44d6c6d3d9b0eadf0fea91b.png">轴上任一点的电场强度;⑵两带电直线上单位长度之间的相互作用力.<img src="https://tihai-oss-cloud.itihey.com/img/785d14fd4da09b01b50d2d2fd41d1c98.jpg">下载 题海APP
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