当前位置:首页>文档>第1部分专题3微专题5 带电粒子在交变场中的运动_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版_第一篇 专题复习

第1部分专题3微专题5 带电粒子在交变场中的运动_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版_第一篇 专题复习

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第1部分专题3微专题5 带电粒子在交变场中的运动_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版_第一篇 专题复习
第1部分专题3微专题5 带电粒子在交变场中的运动_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版_第一篇 专题复习
第1部分专题3微专题5 带电粒子在交变场中的运动_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版_第一篇 专题复习

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微专题 5 带电粒子在交变场中的运动 1.(2022·山东省高三检测)如图甲所示,粒子源能源源不断地产生一种比荷为的带正电粒子, 带电粒子从粒子源飞出时的速度可忽略不计.带电粒子离开粒子源后进入一电压为 U 的加 0 速电场,之后进入长为L、两板间距离为d=L的平行金属板,金属板间有一偏转电场,带 电粒子从两板正中间射入并恰好从下极板的边缘射出偏转电场,然后进入边界为 MN、PQ 的均匀交变磁场中,磁场宽度也为L,边界PQ为一感应挡板,交变磁场的变化规律如图乙 所示,规定垂直纸面向里为磁场的正方向.在t=0时刻进入磁场的带电粒子在磁场中的运 动时间为交变磁场的一个周期,并且射出磁场时垂直打在挡板PQ上.(不计粒子的重力及 粒子间的相互作用,电场、磁场的边界均为理想边界)求: (1)带电粒子进入偏转电场时的速度大小; (2)偏转电场的电场强度; (3)交变磁场的磁感应强度大小. 2.(2022·黑龙江省哈师大附中高三期末)如图甲所示,两个平行正对的水平金属板XX′极板 长L= m,板间距离d=0.2 m,在金属板右端竖直边界MN的右侧有一区域足够大的匀强磁 场,磁感应强度大小为B=5×10-3 T、方向垂直纸面向里.现将X′极板接地,X极板上的 电势φ随时间变化规律如图乙所示.现有带正电的粒子流以 v =105 m/s的速度沿水平中线 0 OO′连续射入电场中,粒子的比荷=108 C/kg,其重力可忽略不计,若粒子打在水平金属 板上则将被吸收.在每个粒子通过电场的极短时间内,电场可视为匀强电场(设两板外无电 场).求:(结果可以保留根式或π) (1)带电粒子射出电场时速度增量的最大值; (2)粒子在磁场中运动的最长时间和最短时间之差;(3)所有进入磁场的粒子在MN上射出磁场的区域长度. 3.(2022·天津市市区重点中学一模)如图甲所示,边界为L 、L ,宽度为d的竖直狭长区域 1 2 内,存在垂直纸面向里的匀强磁场和竖直方向的电场(图中未画出).电场的电场强度做周期 性变化的规律如图乙所示,E>0表示电场方向竖直向上.t=0时,一带正电、质量为m的微 粒从左边界L 上的N 点以水平速度v射入该区域,沿直线运动到Q点后,做一次完整的圆 1 1 周运动,再沿直线运动到右边界L 上的N 点.Q为线段N N 的中点,重力加速度为g,上 2 2 1 2 述d、m、v、g和图像中的E 均为已知量. 0 (1)求微粒所带电荷量q和磁感应强度B的大小; (2)求电场变化的周期T; (3)改变宽度d,使微粒仍能按上述运动过程通过相应宽度的区域,求T的最小值. 4.如图甲所示的xOy平面内存在大小随时间周期性变化的匀强磁场和匀强电场,变化规律 分别如图乙、丙所示(规定垂直纸面向里为磁感应强度的正方向,沿y轴负方向为电场强度 的正方向).在t=0时刻由原点O发射一个初速度大小为v 、方向沿y轴正方向的带正电粒 0 子,粒子的比荷=,v、B、E、t 均为已知量,不计粒子受到的重力. 0 0 0 0 (1)求在0~t 内粒子运动轨迹的半径; 0 (2)求t=2t 时,粒子的位置坐标; 0 (3)若粒子在t=25t 时首次回到坐标原点,求电场强度E 与磁感应强度B 的大小关系. 0 0 0
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  1. CONNECT:[ UseTime:0.001001s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002028s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000858s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000655s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001591s ]
  6. SELECT * FROM `set` [ RunTime:0.000549s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.002034s ]
  8. SELECT * FROM `wendang` WHERE `id` = 374017 LIMIT 1 [ RunTime:0.001086s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 374017 [ RunTime:0.027571s ]
  10. UPDATE `wendang` SET `lasttime` = 1773123815 WHERE `id` = 374017 [ RunTime:0.003236s ]
  11. SELECT * FROM `wendang` WHERE `id` < 374017 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006419s ]
  12. SELECT * FROM `wendang` WHERE `id` > 374017 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007715s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 374017 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002396s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 374017 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001367s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 374017 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000901s ]
0.136020s