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单选题 一无限长载流I的导线,中部弯成如图所示的四分之一圆周AB,圆心为O,半径为R,则在O点处的磁感应强度的大小为(). 
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学科：23-24（1）大学物理Ⅱ
时间：2023-11-09 11:57:47
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题目1单选题
两个同心圆线圈,大圆半径为R,通有电流I1;小圆半径为r,通有电流I2,方向如图.若r << R(大线圈在小线圈处产生的磁场近似为均匀磁场),当它们处在同一平面内时小线圈所受磁力矩的大小为( ). <img src="https://tihai-oss-cloud.itihey.com/img/b69a13a480555b5e5e0588e340889505.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/c5a5ada29583e0dad58952d55b4f11bd.png">B. 0C. <img src="https://tihai-oss-cloud.itihey.com/img/457a8ded2ef625f8c883e608503142a1.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/accad05a111a21d442481eef67ad567d.png">
题目2单选题
取一闭合积分回路 L ,使三根载流导线穿过它所围成的面,现改变三根导线之间的相互间隔,但不越出积分回路,则: ()A. <img src="https://tihai-oss-cloud.itihey.com/img/d8aef347ba49da0f279241cc6855d8f9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ef8a1e5ba193615e77978f83051e2c89.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a8e5f2be3ba7ec5efd24bdb4b5fdaf49.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/91ec52eebf1c967fa36463039da15063.png">
题目3单选题
一带电粒子,垂直射入均匀磁场,如果粒子质量增大到2倍,入射速度增大到2倍,磁场的磁感应强度增大到4倍,则通过粒子运动轨道包围范围内的磁通量增大到原来的()A. 1/4倍B. 2倍C. 4倍D. 1/2倍
题目4单选题
把轻的导线圈用线挂在磁铁N极附近,磁铁的轴线穿过线圈中心,且与线圈在同一平面内,如图所示.当线圈内通以如图所示方向的顺时针电流时,线圈将( ). <img src="https://tihai-oss-cloud.itihey.com/img/054c9bb75a3c62d0d99775f3ef241c06.png">A. 发生转动,同时靠近磁铁B. 不发生转动,只靠近磁铁C. 不发生转动,只离开磁铁D. 发生转动,同时离开磁铁
题目5单选题
一无限长载流I的导线,中部弯成如图所示的四分之一圆周AB,圆心为O,半径为R,则在O点处的磁感应强度的大小为(). <img src="https://tihai-oss-cloud.itihey.com/img/ae4e8667df6b4ca7d432504eca471887.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/0c338c591553ff2dad1b17f2a59e5640.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/855df1efa6100f78a5228d912b888e1b.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/52edf1232e37a4b465d476b4b36b3514.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/319d939d6b14a436b241397564e05d6c.png">
题目6单选题
在磁感应强度为B的均匀磁场中作一半径为r的半球面S,S边线所在平面的法线方向单位矢量n与B的夹角为<img src="https://tihai-oss-cloud.itihey.com/img/6bdbe82f006474fbe9cb5fbc5cb111f8.webp">,则通过半球面S的磁通量(取弯面向外为正)为( ). <img src="https://tihai-oss-cloud.itihey.com/img/d59ee18759a2d9ba1255ec3e1a5f9c47.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/b7596754bf29f45186647917b2a48f22.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/2b03950eaddb5f737a5ceb7433887a96.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/86bd73190156e1b23d1ac07495cf7a13.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/f0a0fe03dcc206f978cd5e8dc82c4b23.png">
题目7单选题
恒定磁场中有一载流圆线圈,若线圈的半径增大一倍,且其中电流减小为原来的一半,磁场强度变为原来的2倍,则该线圈所受的最大磁力矩与原来线圈的最大磁力矩之比为( )A. 2:1B. 8:1C. 1:1D. 4:1
题目8单选题
一载有电流I的细导线分别均匀密绕在半径为R和r的长直圆筒上形成两个螺线管,两螺线管单位长度上的匝数相等.设R = 2r,则两螺线管中的磁感应强度大小BR和Br应满足( )A. BR = 4 BrB. BR = 2 BrC. 2BR = BrD. BR = Br
题目9单选题
一个动量为<img src="https://tihai-oss-cloud.itihey.com/img/f29e17fc9d697e9eb3e910b8be8c0745.png">的电子,沿图示方向入射并能穿过一个宽度为D、磁感强度为B(方向垂直纸面向外)的均匀磁场区域,则该电子出射方向和入射方向间的夹角为( ). <img src="https://tihai-oss-cloud.itihey.com/img/49a067cf5c27d72e00444fcd8523c52a.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/f5501cb79c8118574aa9c6b5bc172ed7.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ac043dc5852c5075bb43b87939b2a800.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/3dfea2b9ae5a2526cb2c3eaaaeaec1af.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/907ee82378b09fdc52e9e5b6fbbb2a54.png">
题目10单选题
一长直载流I的导线,中部折成图示一个半径为R的圆,则圆心的磁感应强度大小为(). <img src="https://tihai-oss-cloud.itihey.com/img/d4cebc02e50bf76db90393ee21f55672.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/0b82867cba26045a974e15d733c210da.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7cb81631197f302c089a7caf8b6609c1.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/0a11d63360ca606472cba0b1fb926057.png">D. 0
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