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第11章第2讲 磁场对运动电荷(带电体)的作用_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章第2讲 磁场对运动电荷(带电体)的作用_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章第2讲 磁场对运动电荷(带电体)的作用_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章第2讲 磁场对运动电荷(带电体)的作用_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章第2讲 磁场对运动电荷(带电体)的作用_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 2 讲 磁场对运动电荷(带电体)的作用 目标要求 1.能判断洛伦兹力的方向,会计算洛伦兹力的大小.2.会分析带电粒子在匀强磁 场中的圆周运动.3.能够分析带电体在匀强磁场中的运动. 考点一 对洛伦兹力的理解和应用 1.洛伦兹力的定义 磁场对________________的作用力. 2.洛伦兹力的大小 (1)v∥B时,F=________; (2)v⊥B时,F=________; (3)v与B的夹角为θ时,F=qvBsin θ. 3.洛伦兹力的方向 (1)判定方法:左手定则,注意四指应指向________电荷运动的方向或________电荷运动的 反方向; (2)方向特点:F⊥B,F⊥v,即F垂直于______决定的平面.(注意B和v不一定垂直) 1.带电粒子在磁场中运动时,一定受到洛伦兹力的作用.( ) 2.若带电粒子经过磁场中某点时所受洛伦兹力为零,则该点的磁感应强度一定为零.( ) 3.洛伦兹力对运动电荷一定不做功.( ) 4.带电粒子在A点受到的洛伦兹力比在B点大,则A点的磁感应强度比B点的大.( ) 洛伦兹力与静电力的比较 洛伦兹力 静电力 v≠0且v不与B平行 产生条件 (说明:运动电荷在磁场中不 电荷处在电场中 一定受洛伦兹力作用) 大小 F=qvB(v⊥B) F=qE力方向与场方向的关系 F⊥B(且F⊥v) F∥E 做功情况 任何情况下都不做功 可能做功,也可能不做功 例1 图中a、b、c、d为四根与纸面垂直的长直导线,其横截面位于正方形的四个顶点上, 导线中通有大小相等的电流,方向如图所示.一带正电的粒子从正方形中心 O点沿垂直于 纸面的方向向外运动,它所受洛伦兹力的方向是( ) A.向上 B.向下 C.向左 D.向右 听课记录:_______________________________________________________________ ________________________________________________________________________ 例2 (多选)两根导线通有大小相等、方向相同的电流,垂直穿过绝缘水平面,俯视图如图 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大小相等的初速度v 分别从a、b两点向O点运动 0 过程中,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 听课记录:_______________________________________________________________ ________________________________________________________________________ 考点二 洛伦兹力作用下带电体的运动 带电体做变速直线运动时,随着速度大小的变化,洛伦兹力的大小也会发生变化,与接触面 间的弹力随着变化(若接触面粗糙,摩擦力也跟着变化,从而加速度发生变化),最后若弹力 减小到0,带电体离开接触面. 例3 (多选)如图所示,粗糙木板MN竖直固定在方向垂直纸面向里的匀强磁场中.t=0时, 一个质量为m、电荷量为q的带正电物块沿MN以某一初速度竖直向下滑动,则物块运动的v-t图像可能是( ) 听课记录:_______________________________________________________________ ________________________________________________________________________ 例4 如图所示,质量为m、带电荷量为q的小球,在倾角为θ的光滑绝缘斜面上由静止开 始下滑.图中虚线是左、右两侧匀强磁场(图中未画出)的分界线,左侧磁场的磁感应强度大 小为,右侧磁场的磁感应强度大小为B,两磁场的方向均垂直于纸面向外.当小球刚下滑至 分界线时,对斜面的压力恰好为0.已知重力加速度为g,斜面足够长,小球可视为质点. (1)判断小球带何种电荷; (2)求小球沿斜面下滑的最大速度; (3)求小球速度达到最大之前,在左侧磁场中下滑的距离L. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 考点三 带电粒子在匀强磁场中的运动 1.在匀强磁场中,当带电粒子平行于磁场方向运动时,粒子做________________运动. 2.带电粒子以速度v垂直磁场方向射入磁感应强度为B的匀强磁场中,若只受洛伦兹力, 则带电粒子在与磁场垂直的平面内做__________运动. (1)洛伦兹力提供向心力:qvB=. (2)轨迹半径:r=________________. (3)周期:T==,可知T与运动速度和轨迹半径________,只和粒子的________和磁场的________________有关. (4)运动时间:当带电粒子转过的圆心角为θ(弧度)时,所用时间t=________________. (5)动能:E=mv2==. k 3.当带电粒子的速度v与B的夹角为锐角时,带电粒子的运动轨迹为螺旋线. 例5 (2023·福建省仙游一中月考)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,则该整体在磁场中做圆周运动的半径将( ) A.变大 B.变小 C.不变 D.条件不足,无法判断 听课记录:_______________________________________________________________ ________________________________________________________________________ 例6 在探究射线性质的过程中,让质量为m 、带电荷量为2e的α粒子和质量为m 、带电 1 2 荷量为e的β粒子,分别垂直于磁场方向射入同一匀强磁场中,发现两种粒子沿半径相同的 圆轨道运动.则α粒子与β粒子的动能之比为( ) A. B. C. D. 听课记录:______________________________________________________________ ________________________________________________________________________ 例7 (2019·全国卷Ⅲ·18)如图,在坐标系的第一和第二象限内存在磁感应强度大小分别为 B和B、方向均垂直于纸面向外的匀强磁场.一质量为m、电荷量为q(q>0)的粒子垂直于x 轴射入第二象限,随后垂直于y轴进入第一象限,最后经过x轴离开第一象限.粒子在磁场 中运动的时间为( ) A. B. C. D. 听课记录:________________________________________________________________ ________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000878s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001403s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000637s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000666s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001214s ]
  6. SELECT * FROM `set` [ RunTime:0.000576s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001415s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373569 LIMIT 1 [ RunTime:0.000983s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373569 [ RunTime:0.036973s ]
  10. UPDATE `wendang` SET `lasttime` = 1773119072 WHERE `id` = 373569 [ RunTime:0.011114s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373569 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001262s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373569 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001237s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373569 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002831s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373569 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003368s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373569 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004635s ]
0.249711s