当前位置:首页>文档>专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题62磁场对运动电荷的作用_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 62 磁场对运动电荷的作用 1.(多选)下列关于洛伦兹力的说法中,正确的是( ) A.洛伦兹力的方向总是垂直于运动电荷的速度方向和磁场方向共同确定的平面,所 以洛伦兹力只改变速度的方向,不改变速度的大小,即洛伦兹力永不做功 B.只要速度大小相同,所受洛伦兹力就相同 C.用左手定则判断电荷在磁场中运动所受的洛伦兹力时,要注意负电荷与正电荷所 受力的方向相反 D.洛伦兹力方向一定与电荷速度方向垂直,磁场方向一定与电荷运动方向垂直 2.匀强磁场垂直纸面向里,在磁场中某点同时释放两个带电粒子 a和b,速度大小和 方向均相同,运动轨迹如图所示.不计带电粒子的重力,下列判断正确的是( ) A.粒子a带正电,粒子b带负电 B.粒子a的比荷()较大 C.粒子b的运动周期较大 D.粒子b的向心加速度较小 3.[2022·福建省仙游一中期中]质量为m的带电微粒a,仅在洛伦兹力作用下做半径为 r的匀速圆周运动.现在a经过的轨迹上放置不带电的微粒b,则a与b发生完全非弹性碰 撞融为一个整体.(不计重力和电荷量的损失)则该整体在磁场中圆周运动的半径将( ) A.变大 B.变小 C.不变 D.条件不足,无法判断 4.[2022·广东省惠州市考试]一长直细金属导线竖直放置,通以向上的恒定电流,一光 滑绝缘管ab水平固定放置,两端恰好落在一以导线为圆心的圆上,俯视如图所示.半径略 小于绝缘管半径的带正电小球自a端以初速度v 向b端运动过程中,则下列说法正确的是( 0 ) A.小球在绝缘管中先加速后减速运动 B.洛伦兹力对小球先做正功再做负功 C.小球在管中点处受到的洛伦兹力为零 D.小球受到洛伦兹力时,洛伦兹力方向始终向下5.如图所示,在磁感应强度为B的匀强磁场中,有一段静止的长为L的通电导线,磁 场方向垂直于导线.设单位长度导线中有n个自由电荷,每个自由电荷的电荷量都为q, 它们沿导线定向移动的平均速率为v.下列选项正确的是( ) A.导线中的电流大小为nLqv B.这段导线受到的安培力大小为nLqvB C.沿导线方向电场的电场强度大小为vB D.导线中每个自由电荷受到的平均阻力大小为qvB 6.(多选)两根导线通有大小、方向相同的电流,垂直穿过绝缘水平面,俯视如图所示. O点是两导线在绝缘水平面内连线的中点,a、b是连线垂直平分线上到O点距离相等的两 点.一可视为质点的带正电滑块以相同大小的初速度v 分别从a、b向O点运动过程中, 0 下列说法正确的是( ) A.滑块在a、b两点受到的磁场力方向相同 B.滑块在a、b两点受到的磁场力方向相反 C.若水平面光滑,则滑块从a点出发后一定做曲线运动 D.若水平面粗糙,则滑块从b点出发后一定做减速运动 7.[2022·湖北黄石市期中]如图所示,在垂直纸面向里,磁感应强度为B的匀强磁场中, 质量为m,带电量为+q的小球穿在足够长的水平固定绝缘的直杆上处于静止状态,小球 与杆间的动摩擦因数为μ.现对小球施加水平向右的恒力F ,在小球从静止开始至速度最大 0 的过程中,下列说法中正确的是( ) A.直杆对小球的弹力方向不变 B.直杆对小球的摩擦力一直减小 C.小球运动的最大加速度为 D.小球的最大速度为 8.[2021·全国乙卷]如图,圆形区域内有垂直纸面向里的匀强磁场,质量为 m,电荷量 为q(q>0)的带电粒子从圆周上的M点沿直径MON方向射入磁场.若粒子射入磁场时的速 度大小为v ,离开磁场时速度方向偏转90°;若射入磁场时的速度大小为v ,离开磁场时 1 2 速度方向偏转60°.不计重力,则为( )A. B. C. D. 9.[2020·全国卷Ⅰ]一匀强磁场的磁感应强度大小为B,方向垂直于纸面向外,其边界 如图中虚线所示,为半圆,ac、bd与直径ab共线,ac间的距离等于半圆的半径.一束质 量为m、电荷量为q(q>0)的粒子,在纸面内从c点垂直于ac射入磁场,这些粒子具有各种 速率.不计粒子之间的相互作用.在磁场中运动时间最长的粒子,其运动时间为( ) A. B. C. D. 10.[2021·河北卷]如图,一对长平行栅极板水平放置,极板外存在方向垂直纸面向外、 磁感应强度大小为B的匀强磁场,极板与可调电源相连.正极板上O点处的粒子源垂直极 板向上发射速度为v 、带正电的粒子束,单个粒子的质量为 m、电荷量为q.一足够长的挡 0 板OM与正极板成37°倾斜放置,用于吸收打在其上的粒子.C、P是负极板上的两点,C 点位于O点的正上方,P点处放置一粒子靶(忽略靶的大小),用于接收从上方打入的粒子, CP长度为L.忽略栅极的电场边缘效应、粒子间的相互作用及粒子所受重力,sin 37°=. 0 (1)若粒子经电场一次加速后正好打在P点处的粒子靶上,求可调电源电压U 的大小; 0 (2)调整电压的大小,使粒子不能打在挡板OM上,求电压的最小值U ; min (3)若粒子靶在负极板上的位置 P 点左右可调,则负极板上存在 H、S 两点 (CH≤CP
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  1. CONNECT:[ UseTime:0.001196s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001680s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000667s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001271s ]
  6. SELECT * FROM `set` [ RunTime:0.000607s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001501s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369538 LIMIT 1 [ RunTime:0.001064s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369538 [ RunTime:0.027156s ]
  10. UPDATE `wendang` SET `lasttime` = 1773089212 WHERE `id` = 369538 [ RunTime:0.002534s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369538 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001334s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369538 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001077s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369538 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013786s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369538 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005973s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369538 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015854s ]
0.252587s