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单选题 三个电量为q的电荷放在边长为b的等边三角形的顶点,电荷Q放在三角形的重心上.为使每个电荷受力为零,Q为( )
A. 
B. 
C. 
D. 
学科：大学物理A1
时间：2025-06-19 17:34:45
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题目1单选题
如图所示,有三个点电荷Q1、Q2、Q3沿一条直线等间距分布,且Q1=Q3=Q,已知其中任一点电荷所受合力均为零,则Q2大小为( )<img src="https://tihai-oss-cloud.itihey.com/img/207b2e4f958951b71cbda4afcb20b5c4.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/206ad3bf8b6ce640b7ff05e1b4ef1d05.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/bed35ad59d73a86a6593d6093dbed603.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/fba3e75348ed464d10f9028f69186da6.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/8888261a10c74aa3df9a67ce19b6e3c6.png">
题目2单选题
正方形的两对角线上,各置电荷Q,在其余两对角线上各置电荷q,若Q所受合力为零,Q与q的大小关系为( )<img src="https://tihai-oss-cloud.itihey.com/img/5d948edb8371e1704e7c3b888493420d.png">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3单选题
三个点电荷均在同一条直线上,A、C固体不动,A和C电荷之比为5:1,而B也不动时,BA与BC之间的比值为( )A. 5B. 1/5C. <img src="https://tihai-oss-cloud.itihey.com/img/361b664af38b27956545458648205f4b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/811eba733ba59b5cd8315b1a764401f7.png">
题目4单选题
三个电量为q的电荷放在边长为b的等边三角形的顶点,电荷Q放在三角形的重心上.为使每个电荷受力为零,Q为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/99487ca4181775a1cc8084cfc41d6ca7.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/d995b5df72a4ea80baa383db0187bbb7.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/51a9269aedaba266a54e3bae5a3e2beb.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/5261b7bdf24063c9f83e5efb5bc0ff04.png">
题目5单选题
如图所示,现有两无限大均匀带电平面,两平面平行,电荷面密度均为<img src="https://tihai-oss-cloud.itihey.com/img/bd1a860ea5befaed9b60ac326ec747ab.png">,则图中三个区域内场强的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/1335ea99886ad949089be523bc2e5051.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/3551413f26c222a5f8f18c208e6da888.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/04a47e597862141c6479c5a7e8d645ab.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/6b2f53a52a3190e0fe5d1bed20f9ea40.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/1c96808f88d82c9d6e78cf65d5c39b46.png">
题目6单选题
如图所示,真空中有两带电平面,面积均为S,相距为d(d很小),带电量分别为+q和-q,两平面间作用力F的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/a1456f376d3477429b28153ec1d759dc.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/1f13386b7b85b0e3bed7b93379032985.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/cc9a335b2608c0d024f3320d517d33ce.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/c5346fba0011c8d91f249d52a567a087.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/be771e1668424c812ebbf6277e5daea9.png">
题目7单选题
如图所示,在边长为a的正方形的三个顶点上各放置电量为+q、-q、+q的点电荷,则D点处场强的大小为( ).<img src="https://tihai-oss-cloud.itihey.com/img/7bad23df5ceead36bdde408bcf7af7ea.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/b199e0e55ba0c7c35ef494b550ebde58.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/760cee605ebb8b677b7d0c767342e2ef.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/d6a42de0955e8b919cb788235816af5d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/71e7d028468dc6f0c6af1b84d5b0542a.png">
题目8单选题
将电荷Q分成q和(Q-q)两部分,并将它们分开一定的距离,它们之间静电力为最大的条件是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/e31437505304842787c3026950218d1a.png"><br>B. <img src="https://tihai-oss-cloud.itihey.com/img/8a0fb5928babb543c5b4d13fb1e3f3e1.png"><br>C. <img src="https://tihai-oss-cloud.itihey.com/img/c513d879acc61290a51205b79177afd4.png"><br>D. <img src="https://tihai-oss-cloud.itihey.com/img/8ed91fc1405bb9ec757340902d81d4db.png"><br>
题目9单选题
两根无限长的均匀带电线相互平行,相距为2a,线电荷密度为+λ和-λ,每单位长度带电线受到另一条带电线的作用力大小为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/6855613a51639a1bebf1d4ef04b329aa.png"><br>B. <img src="https://tihai-oss-cloud.itihey.com/img/9be323a97d5107cbce82b42a7d3ca756.png"><br>C. <img src="https://tihai-oss-cloud.itihey.com/img/465209fc43bd1c9a20b47a3700ff371a.png"><br>D. <img src="https://tihai-oss-cloud.itihey.com/img/c60288a0ae36490cee47bca36a0a451c.png"><br>
题目10简答题
一半径为R的半圆细环上均匀地分布电荷Q,求环心处的电场强度.<img src="https://tihai-oss-cloud.itihey.com/img/f4e8f91d44aeb5fabd79513c372b5cab.png">下载 题海APP
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