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单选题 一空气平行板电容器,极板间距为d,电容为c.若在两板中间平行地插入一块厚度为d/3的金属板,则其电容值变为( ) 
学科：大学物理（2）
时间：2024-12-03 04:31:28
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题目1单选题
如图所示,a、b、c是电场中某条电场线上的三个点,由此可知( )<img src="https://tihai-oss-cloud.itihey.com/img/ed10608410b33d20451feb7fbfa492e2.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/aeffcb63297b7cf42448f85e5234c86f.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/3c3e3f8ddb2d79c5484c37942b4ccf13.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/49028bcf372cf3dcc42d1d55aecf61dd.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/e34a44ea86abd4930489e6b8679d1962.png">
题目2单选题
真空中一"无限大"均匀带负电荷的平板,电荷面密度为-s(s>0),其电场强度的分布曲线应是(坐标原点在板所在位置,且设方向向右为正、向左为负) ( )A. <img src="https://tihai-oss-cloud.itihey.com/img/176e944f7929b6dcea7a909f058bad8d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/e9e61fdd314e056353b06952de7fdcd7.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/9ecc7b23226ae4e0a5ecf78cfd975518.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/519060ed779552ae36f020b1e10f9ed8.png">
题目3单选题
有两个点电荷电量都是+q,相距为2a.今以左边的点电荷所在处为球心,以a为半径作一球形高斯面.在球面上取两块相等的小面积S1和S2,其位置如图所示.设通过S1和S2的电场强度通量分别为<img src="https://tihai-oss-cloud.itihey.com/img/a95885b4de045ed078e58700b9c4c397.png">和<img src="https://tihai-oss-cloud.itihey.com/img/ca19820269295e0f68a46d2cc22a10d9.png">,通过整个球面的电场强度通量为<img src="https://tihai-oss-cloud.itihey.com/img/7802cbf4a64ba5fb10e00f9caf5ec1ae.png">,则 ( )<img src="https://tihai-oss-cloud.itihey.com/img/bfd8a22019509b6274cf0d2b9f5d45f1.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/f784537fbacfecf420300f65d83eb40c.png">,<img src="https://tihai-oss-cloud.itihey.com/img/c3122bafffa686c4e02501d23ec44f89.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/4baa11214d9966c8a8672ae8ea3755ca.png">,<img src="https://tihai-oss-cloud.itihey.com/img/c3122bafffa686c4e02501d23ec44f89.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/ca7ceef2b14116e568392f1ba399fefd.png">,<img src="https://tihai-oss-cloud.itihey.com/img/9ea66019b541ff25139deebcc658fd33.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/ca7ceef2b14116e568392f1ba399fefd.png">,<img src="https://tihai-oss-cloud.itihey.com/img/c3122bafffa686c4e02501d23ec44f89.png">
题目4单选题
真空中面积为S,间距为d的两平行板(S>>d<img src="https://tihai-oss-cloud.itihey.com/img/847f1479efe2209f96682f512a425e81.webp">),均匀带等量异号电荷+q和-q,忽略边缘效应,则两板间相互作用力的大小是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/467b7d802a4c908cd946f86122866e6d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/f9db887a256cf58d035531047367d0b1.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a257c7dc0bf7ef5fdf82a4f3469c267b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/efe2a79a339b212157743ccb6cbb9afd.png">
题目5单选题
如图所示,一个带电量为q的点电荷位于立方体的A角上,则通过侧面abcd的电场强度通量等于( ) <img src="https://tihai-oss-cloud.itihey.com/img/22980de299f1da6104a2e2b5bcbc19f2.jpg">A. <img src="https://tihai-oss-cloud.itihey.com/img/ed95ac3a7afa6f8617dd989e8dda85ef.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/b64242f7f1494d3d92134d4670baf53b.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/bd7838f88d5095e43e64492497518359.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/0d9bae2945852df20ebcb4e3ed3cd46f.png">
题目6单选题
一空气平行板电容器,极板间距为d,电容为c.若在两板中间平行地插入一块厚度为d/3的金属板,则其电容值变为( ) <img src="https://tihai-oss-cloud.itihey.com/img/372ac29eff5a5f3d71b17f9b369af67c.png">A. 2CB. 3 C/2C. 2C/3D. C
题目7单选题
根据高斯定理的数学表达式<img src="https://tihai-oss-cloud.itihey.com/img/a670176b0057241e99c3f3fcb916bb82.png">可知下述各种说法中,正确的是( )A. 闭合面内的电荷代数和不为零时,闭合面上各点场强一定处处不为零B. 闭合面内的电荷代数和为零时,闭合面上各点场强不一定处处为零C. 闭合面内的电荷代数和为零时,闭合面上各点场强一定为零D. 闭合面上各点场强均为零时,闭合面内一定处处无电荷
题目8单选题
A、B两个点电荷间距离恒定,当其它电荷移到A、B附近时,A、B之间的库仑力将( )A. 可能变大B. 一定不变C. 可能变小D. 不能确定
题目9单选题
当一个带电导体达到静电平衡时( )A. 表面曲率较大处电势较高B. 导体内部的电势比导体表面的电势高C. 导体内任一点与其表面上任一点的电势差为零D. 表面上电荷密度较大处电势较高
题目10单选题
一导体球外充满相对介电常量为<img src="https://tihai-oss-cloud.itihey.com/img/f1978ea65b377e9e5adc9922c89ce19c.png">的均匀电介质,若测得导体表面附近场强为E, 则导体球面上的自由电荷面密度σ为<img src="https://tihai-oss-cloud.itihey.com/img/81dfa672c06270f98029145c404d48de.gif">( )A. <img src="https://tihai-oss-cloud.itihey.com/img/77214b5ed227be45e2b3b2acc40c3879.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7c8890dcb9fcb3dd88b475126dfcb8c1.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/9a51508126d2699974381f4cdb6b5aa5.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/1503d48ea93f12cb8b81c365ce1cb9c9.png">
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