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第11章专题强化21 带电粒子在叠加场和交变电、磁场中的运动_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

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第11章专题强化21 带电粒子在叠加场和交变电、磁场中的运动_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
第11章专题强化21 带电粒子在叠加场和交变电、磁场中的运动_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
第11章专题强化21 带电粒子在叠加场和交变电、磁场中的运动_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

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专题强化二十一 带电粒子在叠加场和交变电、磁场中的运 动 目标要求 1.了解叠加场的特点,会处理带电粒子在叠加场中的运动问题.2.掌握带电粒子 在交变电、磁场中运动的解题思路和处理方法. 题型一 带电粒子在叠加场中的运动 1.叠加场 电场、磁场、重力场共存,或其中某两场共存. 2.带电粒子在叠加场中常见的几种运动形式 运动性质 受力特点 方法规律 匀速直 粒子所受合力为0 平衡条件 线运动 匀速圆 除洛伦兹力外,另外两力的合力为零: 牛顿第二定律、圆周运动的规 周运动 qE=mg 律 较复杂的 除洛伦兹力外,其他力的合力既不为 动能定理、能量守恒定律 曲线运动 零,也不与洛伦兹力等大反向 例1 (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 听课记录:_______________________________________________________________ ________________________________________________________________________ 例2 如图所示,位于竖直平面内的坐标系xOy,在第三象限空间有垂直于纸面向外的匀强磁场,磁感应强度大小为B=0.5 T,还有沿x轴负方向的匀强电场,电场强度大小为E=2 N/C.在第一象限空间有沿y轴负方向、电场强度大小也为E的匀强电场,并在y>h=0.4 m 的区域有磁感应强度大小也为B的垂直于纸面向里的匀强磁场.一个带电荷量为q的油滴从 图中第三象限的P点得到一初速度,恰好能沿PO做匀速直线运动(PO与x轴负方向的夹角 为θ=45°),并从原点O进入第一象限.已知重力加速度g取10 m/s2,求: (1)油滴在第三象限运动时受到的重力、静电力、洛伦兹力三力的大小之比,并指出油滴带 哪种电荷; (2)油滴在P点得到的初速度大小; (3)油滴在第一象限运动的时间(取π=3.14). ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 题型二 带电粒子在交变电、磁场中的运动 解决带电粒子在交变电、磁场中的运动问题的基本思路 先读图 看清并且明白场的变化情况 受力分析 分析粒子在不同的变化场区的受力情况 过程分析 分析粒子在不同时间段内的运动情况 找衔接点 找出衔接相邻两过程的速度大小及方向 选规律 联立不同阶段的方程求解 例3 如图甲所示,水平放置的平行金属板 a、b间加直流电压U,a板上方有足够长的 “V”字形绝缘弹性挡板,两板夹角为 60°,在挡板间加垂直纸面的交变磁场,磁感应强度 随时间变化如图乙,垂直纸面向里为磁场正方向,其中B=B,B 未知.现有一比荷为、不 1 0 2 计重力的带正电粒子从c点由静止释放,t=0时刻,粒子刚好从小孔O进入上方磁场中,在 t 时刻粒子第一次撞到左挡板,紧接着在t +t 时刻粒子撞到右挡板,然后粒子从O点竖直 1 1 2 向下返回平行金属板间,使其在整个装置中做周期性的往返运动.粒子与挡板碰撞前后电荷 量不变,沿板方向的分速度不变,垂直板方向的分速度大小不变、方向相反,不计碰撞的时 间及磁场变化产生的影响.求:(1)粒子第一次到达O点时的速率; (2)图中B 的大小; 2 (3)金属板a和b间的距离d. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 例4 如图(a)所示的xOy平面处于变化的匀强电场和匀强磁场中,电场强度E和磁感应强 度B随时间t做周期性变化的图像如图(b)所示,y轴正方向为E的正方向,垂直于纸面向里 为B的正方向,t=0时刻,带负电的粒子P(重力不计)由原点O以速度v 沿y轴正方向射出, 0 它恰能沿一定轨道做周期性运动.v 、E 和t 为已知量,且=,在0~t 时间内粒子P第一 0 0 0 0 次离x轴最远时的坐标为(,).求: (1)粒子P的比荷; (2)t=2t 时刻粒子P的位置坐标; 0 (3)带电粒子在运动中距离原点O的最远距离L. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000569s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000889s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004833s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006385s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000682s ]
  6. SELECT * FROM `set` [ RunTime:0.001601s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000597s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373539 LIMIT 1 [ RunTime:0.001836s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373539 [ RunTime:0.004529s ]
  10. UPDATE `wendang` SET `lasttime` = 1773118883 WHERE `id` = 373539 [ RunTime:0.002759s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373539 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010258s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373539 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003739s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373539 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015408s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373539 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015264s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373539 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018992s ]
0.161942s