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第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义

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第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第11章专题强化20 带电粒子在组合场中的运动_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义

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专题强化二十 带电粒子在组合场中的运动 目标要求 1.掌握带电粒子在组合场中的运动规律和分析思路.2.学会处理磁场与磁场组合 场、电场与磁场组合场中带电粒子的运动问题. 1.组合场:电场与磁场各位于一定的区域内,并不重叠,或在同一区域,电场、磁场交替 出现. 2.分析思路 (1)画运动轨迹:根据受力分析和运动学分析,大致画出粒子的运动轨迹图. (2)找关键点:确定带电粒子在场区边界的速度(包括大小和方向)是解决该类问题的关键. (3)划分过程:将粒子运动的过程划分为几个不同的阶段,对不同的阶段选取不同的规律处 理. 3.常见粒子的运动及解题方法 题型一 磁场与磁场的组合 磁场与磁场的组合问题实质就是两个有界磁场中的圆周运动问题,带电粒子在两个磁场中的 速度大小相同,但轨迹半径和运动周期往往不同.解题时要充分利用两段圆弧轨迹的衔接点 与两圆心共线的特点,进一步寻找边角关系. 例1 如图所示,在无限长的竖直边界AC和DE间,上、下部分分别充满方向垂直于平面 ADEC向外的匀强磁场,上部分区域的磁感应强度大小为B ,OF为上、下磁场的水平分界 0 线.质量为 m、带电荷量为+q的粒子从AC边界上与O点相距为a的P点垂直于AC边界射入上方磁场区域,经OF上的Q点第一次进入下方磁场区域,Q点与O点的距离为3a.不 考虑粒子重力. (1)求粒子射入时的速度大小; ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ (2)要使粒子不从AC边界飞出,求下方磁场区域的磁感应强度大小B 应满足的条件; 1 (3)若下方区域的磁感应强度B=3B ,粒子最终垂直DE边界飞出,求边界 DE与AC间距离 0 的可能值. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 题型二 电场与磁场的组合 1.带电粒子在匀强电场中做匀加速直线运动,在匀强磁场中做匀速圆周运动,如图所示. 2.带电粒子在匀强电场中做类平抛(或类斜抛)运动,在磁场做匀速圆周运动,如图所示考向1 先电场后磁场 例2 (2018·全国卷Ⅰ·25)如图,在y>0的区域存在方向沿y轴负方向的匀强电场,场强大 小为E;在y<0的区域存在方向垂直于xOy平面向外的匀强磁场.一个氕核H和一个氘核H 先后从y轴上y=h点以相同的动能射出,速度方向沿x轴正方向.已知H进入磁场时,速 度方向与x轴正方向的夹角为60°,并从坐标原点O处第一次射出磁场.H的质量为m,电荷 量为q.不计重力.求: (1)H第一次进入磁场的位置到原点O的距离; (2)磁场的磁感应强度大小; (3)H第一次离开磁场的位置到原点O的距离. 规范答题区 评价项目(100分) 自评得分 书写工整,卷面整洁(20分) 有必要的文字说明,指明研究 对象、过程、所用规律(20分) 列式规范,无连等式,无变形 后公式(20分) 无代数过程,有联立①②③式 得(20分) 结果规范,中间关键点有结 果,矢量指明方向(20分) 总分 考向2 先磁场后电场 例3 (2023·河北唐山市模拟)平面直角坐标系 xOy中,直线OP与x轴正方向的夹角为 30°,其上方存在方向垂直纸面向外的匀强磁场,下方存在匀强电场,电场强度方向与 x轴 负方向的夹角为60°,如图所示.质量为m、电荷量为q的带正电粒子以速度v从坐标原点 沿y轴正方向进入磁场,经磁场偏转后由P点进入电场,最后从x轴上的Q点离开电场,已 知O、P两点间距离为L,PQ连线平行于y轴.不计粒子重力,求:(1)匀强磁场的磁感应强度B的大小; (2)匀强电场的电场强度E的大小. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 考向3 粒子多次进出电场、磁场的运动 例4 (2021·广东卷·14)图是一种花瓣形电子加速器简化示意图,空间有三个同心圆a、b、 c围成的区域,圆a内为无场区,圆a与圆b之间存在辐射状电场,圆b与圆c之间有三个 圆心角均略小于90°的扇环形匀强磁场区Ⅰ、Ⅱ和Ⅲ.各区磁感应强度恒定,大小不同,方向 均垂直纸面向外.电子以初动能E 从圆b上P点沿径向进入电场,电场可以反向,保证电 k0 子每次进入电场即被全程加速,已知圆 a与圆b之间电势差为U,圆b半径为R,圆c半径 为R,电子质量为m,电荷量为e,忽略相对论效应,取tan 22.5°=0.4. (1)当E =0时,电子加速后均沿各磁场区边缘进入磁场,且在电场内相邻运动轨迹的夹角θ k0 均为45°,最终从Q点出射,运动轨迹如图中带箭头实线所示,求Ⅰ区的磁感应强度大小、 电子在Ⅰ区磁场中的运动时间及在Q点出射时的动能; (2)已知电子只要不与Ⅰ区磁场外边界相碰,就能从出射区域出射.当 E =keU时,要保证 k0 电子从出射区域出射,求k的最大值. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 例5 如图所示,一对足够长平行栅极板M、N水平放置,极板与可调电源相连.极板外 上方和下方分别存在方向垂直纸面向外和向内的匀强磁场 B 和B ,B 和B 的大小未知,但 1 2 1 2 满足B =B ,磁场左边界上距M板距离为2l的A点处的粒子源平行极板向右发射速度为 v 2 1 的带正电粒子束,单个粒子的质量为m、电荷量为q,粒子第1次离开M板的位置为C点,已知C点距离磁场左边界距离为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. (1)求磁感应强度B 的大小; 1 ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ (2)当两板间电势差U =0时,粒子经过下方磁场一次偏转后恰能从C点再次返回极板上方 MN 的磁场,求两板间距d的大小; (3)当两板间所加的电势差U =-时,在M板上C点右侧P点处放置一粒子靶(忽略靶的大 MN 小),用于接收从M板上方打入的粒子.问当P点离磁场左边界多远的地方能接收到粒子? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000586s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000720s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004806s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001081s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.002744s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000687s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373538 LIMIT 1 [ RunTime:0.019544s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373538 [ RunTime:0.013277s ]
  10. UPDATE `wendang` SET `lasttime` = 1773118865 WHERE `id` = 373538 [ RunTime:0.002473s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373538 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003738s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373538 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010374s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373538 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035790s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373538 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.112985s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373538 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.063845s ]
0.363013s