当前位置:首页>文档>专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题48带电粒子在电场中的加速和偏转_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 48 带电粒子在电场中的加速和偏转 1.[2022·安徽省六安中学期末]下列粒子(不计重力)从静止状态开始经过电压为U的电 场加速后,速度最小的是( ) A.氚核(H) B.氘核(H) C.α粒子(He) D.质子(H) 2.[2022·广东省六校联考]中医药文化是我国优秀传统文化的重要组成部分,中药的保 存常常需要做干燥处理.如图所示是利用高压电场干燥中药的基本原理,在大导体板 MN 上铺一薄层中药材,针状电极 O和平板电极MN接高压直流电源,其间产生非匀强电场 E;水分子是极性分子,可以看成棒状带电体,一端带正电荷,另一端带等量负电荷;水 分子在电场力的作用下会加速从中药材中分离出去,在鼓风机的作用下飞离电场区域从而 达到快速干燥的目的.已知虚线ABCD是某一水分子从A处由静止开始的运动轨迹,则下 列说法正确的是( ) A.水分子在B处时,上端带正电荷,下端带负电荷 B.水分子在B处时,带负电荷一端受到的电场力大于带正电荷一端受到的电场力 C.水分子运动轨迹上B、C和D点的电势大小关系为φ >φ >φ D B C D.如果把高压直流电源的正负极反接,水分子从A处开始将向下运动 3.[2022·河南濮阳市阶段练习](多选)有三个质量相等、分别带正电、负电和不带电的 小球A、B、C,从同一位置以相同速度v 先后射入竖直方向的匀强电场中,它们落在正极 0 板的位置如图所示,则下列说法中正确的是( ) A.小球A带正电,小球B不带电,小球C带负电 B.三个小球在电场中运动的时间相等 C.三个小球到达正极板的速度v <v <v A B C D.三个小球在电场中的加速度a <a <a C B A 4.[2022·湖南岳阳市三模]示波管原理图如图甲所示.它由电子枪、偏转电极和荧光屏 组成,管内抽成真空.如果在偏转电极XX′和YY′之间都没有加电压,电子束从电子枪射出 后沿直线运动,打在荧光屏中心,产生一个亮斑如图乙所示.若板间电势差U 和U 随时 XX′ YY′ 间变化关系图象如丙、丁所示,则荧光屏上的图象可能为( )5.[2022·浙江省稽阳联谊学校联考]如图所示,含有大量H、H、He的粒子流无初速度 进入某一加速电场,然后沿平行金属板中心线上的O点进入同一偏转电场,最后打在荧光 屏上.不计粒子重力和阻力,下列说法正确的是( ) A.荧光屏上出现两个亮点 B.三种粒子同时到达荧光屏 C.三种粒子打到荧光屏上动能相同 D.三种粒子打到荧光屏上速度方向相同 6.[2022·浙江省七彩阳光联考]如图所示,比荷相同,但初速度大小不同的两个带电粒 子(重力不计),从左边靠近上极板的位置水平射入平行板电容器,粒子1打在下极板中点 处,粒子2由右侧竖直位移中点处射出电场区域.下列说法正确的是( ) A.两个粒子在电场中的运动时间之比t∶t=1∶2 1 2 B.两个粒子末速度方向与水平方向的夹角θ∶θ=4∶1 1 2 C.两个粒子的初速度之比v∶v=1∶2 1 2D.两个粒子末动能大小之比E ∶E =2∶1 k1 k2 7.[2022·重庆三模]“电子能量分析器”主要由处于真空中的电子偏转器和探测板组成. 电子偏转器的简化剖面结构如图所示,A、B表示两个同心半圆金属板,两板间存在偏转电 场,板A、B的电势分别为φ 、φ .电子从偏转器左端的中央M进入,经过偏转电场后到达 A B 右端的探测板N.动能不同的电子在偏转电场的作用下到达板 N的不同位置,初动能为E k0 的电子沿电势为φ 的等势面C(图中虚线)做匀速圆周运动到达板N的正中间.动能为E 、 C k1 E 的电子在偏转电场作用下分别到达板 N的左边缘和右边缘,动能改变量分别为|ΔE |和| k2 k左 ΔE |.忽略电场的边缘效应及电子之间的相互影响.下列判断正确的是( ) k右 A.偏转电场是匀强电场 B.φ >φ A B C.E >E D.|ΔE |>|ΔE | k1 k2 k左 k右 8.[2022·江西省七校第一次联考]如图所示,xOy为竖直平面内的一个直角坐标系,在 y =0.5 m的直线的上方有沿y轴正方向范围足够大的匀强电场,电场强度大小E=9.3×10 1 -7 V/m,在y轴上y =1.0 m处有一放射源S,x轴上有一个足够大的荧光屏,放射源S在 2 如图180°范围内,向x轴发射初速度v=200 m/s的电子,电子质量为9.3×10-31 kg,电量 0 为1.6×10-19 C,整个装置放在真空中,不计重力作用.求: (1)从放射源S发射的每个电子打到荧光屏上的动能; (2)水平向右射出的电子在离开电场时沿x轴方向前进的距离; (3)从放射源S发射的电子打到荧光屏上的范围.9.[2022·辽宁省月考]如图所示,竖直平面内的矩形ABCD区域内存在方向水平向左的 匀强电场(图中未画出),AD竖直.若使一质量为m、电荷量为q的带正电小球(视为质点) 从AD上的O点沿OB方向(OB与OA的夹角θ=37°)射入电场,则小球做直线运动并恰好 能到达B点;若使该小球沿垂直于OB方向射入电场,则小球恰好从D点射出电场.AB= d,BC=3d,重力加速度大小为g,取sin 37°=0.6,cos 37°=0.8,不计空气阻力.求: (1)匀强电场的电场强度大小E以及小球从O点运动到B点的时间t; 1 (2)小球沿OB方向与垂直OB方向射入电场的初速度大小之比. 10.[2022·安徽省合肥市联考]如图所示,水平虚线MN和水平地面之间有水平向右的 匀强电场,MN到地面的距离为h=3 m,光滑绝缘长木板PQ直立在地面上,电场与木板 表面垂直,一个质量为m=0.1 kg,带电量为q=+1×10-3 C的物块贴在长木板右侧的A 点由静止释放,物块做初速度为零的加速直线运动,刚好落在地面上的 C点,已知A点离 地面的高度h =1.8 m,C点离木板的距离为L=2.4 m,重力加速度g取10 m/s2,不计物 1 块的大小,木板足够长,求: (1)匀强电场的电场强度E的大小; (2)改变物块贴在木板右侧由静止释放的位置,使物块由静止释放后仍能落在 C点,则 改变后的位置离地面的高度为多少.
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  1. CONNECT:[ UseTime:0.000516s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000834s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000534s ]
  6. SELECT * FROM `set` [ RunTime:0.000222s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000675s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369156 LIMIT 1 [ RunTime:0.000521s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369156 [ RunTime:0.011386s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086891 WHERE `id` = 369156 [ RunTime:0.000557s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369156 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001075s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369156 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000541s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369156 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000946s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369156 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001394s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369156 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002259s ]
0.163842s