当前位置:首页>文档>第1部分专题3微专题4 带电粒子在复合场中的运动_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_301

第1部分专题3微专题4 带电粒子在复合场中的运动_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_301

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第1部分专题3微专题4 带电粒子在复合场中的运动_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_301
第1部分专题3微专题4 带电粒子在复合场中的运动_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_301
第1部分专题3微专题4 带电粒子在复合场中的运动_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_301
第1部分专题3微专题4 带电粒子在复合场中的运动_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_301

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微专题 4 带电粒子在复合场中的运动 命题规律 1.命题角度:(1)带电粒子在组合场中的运动;(2)带电粒子在叠加场中的运动. 2.常用方法:分段分析法,建立运动模型.3.常考题型:计算题. 考点一 带电粒子在组合场中的运动 1.带电粒子的“电偏转”和“磁偏转”的比较 垂直进入磁场(磁偏转) 垂直进入电场(电偏转) 情景图 F =qvB,F 大小不变,方向变 F =qE,F 大小、方向均不 B 0 B E E 受力 化,方向总指向圆心,F 为变力 变,F 为恒力 B E 类平抛运动 匀速圆周运动 运动规律 v=v,v=t x 0 y r=,T= x=vt,y=t2 0 2.常见运动及处理方法 3.“5步”突破带电粒子在组合场中的运动问题 例1 如图所示,在平面直角坐标系xOy的第Ⅰ、Ⅳ象限内有一半径为R的半圆弧,半圆弧 的圆心在坐标原点O处,半圆弧内有方向沿y轴正方向的匀强电场,半圆弧外足够大的范围内有磁感应强度大小为B、方向垂直于坐标平面向外的匀强磁场.现从O点由静止释放一个 质量为m、电荷量为q的带正电粒子,粒子经电场加速后进入磁场,并从半圆弧与 x轴的交 点P返回电场,不计粒子受到的重力. (1)求匀强电场的电场强度大小E; (2)求粒子从O点运动到P点的时间t; (3)证明粒子经过P点后从y轴离开电场,并求粒子经过P点后离开电场时的速度大小v. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ 考点二 带电粒子在叠加场中的运动 1.三种典型情况 (1)若只有两个场,所受合力为零,则表现为匀速直线运动或静止状态.例如电场与磁场叠 加满足qE=qvB时,重力场与磁场叠加满足mg=qvB时,重力场与电场叠加满足mg=qE 时. (2)若三场共存,所受合力为零时,粒子做匀速直线运动,其中洛伦兹力F=qvB的方向与速 度v垂直. (3)若三场共存,粒子做匀速圆周运动时,则有mg=qE,粒子在洛伦兹力作用下做匀速圆周 运动,即qvB=m. 2.当带电粒子做复杂的曲线运动或有约束的变速直线运动时,一般用动能定理或能量守恒 定律求解. 3.分析例2 (多选)(2022·广东卷·8)如图所示,磁控管内局部区域分布有水平向右的匀强电场和垂 直纸面向里的匀强磁场.电子从M点由静止释放,沿图中所示轨迹依次经过N、P两点.已 知M、P在同一等势面上,下列说法正确的有( ) A.电子从N到P,电场力做正功 B.N点的电势高于P点的电势 C.电子从M到N,洛伦兹力不做功 D.电子在M点所受的合力大于在P点所受的合力 学习笔记:__________________________________________________________________ ____________________________________________________________________________ 例3 (2022·广东高州市二模)如图所示,在区域Ⅰ有与水平方向成45°角的匀强电场,电场 方向斜向左下方.在区域Ⅱ有竖直向下的匀强电场和垂直纸面向里的匀强磁场,电场强度大 小为E =,磁感应强度大小为B.质量为m、电荷量为-q的粒子从区域Ⅰ的左边界P点由静 2 止释放,粒子沿虚线水平向右运动,进入区域Ⅱ,区域Ⅱ的宽度为d.粒子从区域Ⅱ右边界的 Q点离开,速度方向偏转了60°.重力加速度大小为g.求: (1)区域Ⅰ的电场强度大小E; 1 (2)粒子进入区域Ⅱ时的速度大小; (3)粒子从P点运动到Q点的时间. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ (2022·山西省一模)如图所示,以两竖直虚线M、N为边界,中间区域Ⅰ内存在方向竖直向下 的匀强电场,电场强度大小为E,两边界M、N间距为d.N边界右侧区域Ⅱ中存在磁感应强 度大小为B、方向垂直于纸面向里的匀强磁场.M边界左侧区域Ⅲ内,存在垂直于纸面向外 的匀强磁场.边界线M上的O点处有一离子源,水平向右发射同种正离子.已知初速度为v 的离子第一次回到边界M时恰好到达O点,电场及两磁场区域足够大,不考虑离子的重 0 力和离子间的相互作用. (1)求离子的比荷; (2)初速度为的离子第二次回到边界M时也能恰好到达O点,求区域Ⅲ内磁场的磁感应强度 大小. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000580s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000627s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000221s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000465s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000502s ]
  8. SELECT * FROM `wendang` WHERE `id` = 374016 LIMIT 1 [ RunTime:0.000358s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 374016 [ RunTime:0.013972s ]
  10. UPDATE `wendang` SET `lasttime` = 1773123816 WHERE `id` = 374016 [ RunTime:0.000428s ]
  11. SELECT * FROM `wendang` WHERE `id` < 374016 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `wendang` WHERE `id` > 374016 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000363s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 374016 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001837s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 374016 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001633s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 374016 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000857s ]
0.094458s