当前位置:首页>文档>专题66带电粒子在组合场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

专题66带电粒子在组合场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题66带电粒子在组合场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题66带电粒子在组合场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题66带电粒子在组合场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题 66 带电粒子在组合场中的运动 1.[2022·湖北省检测](多选)如图所示,两平行金属板长度均为L,O、O′为两金属板中 心处正对的两个小孔,两平行金属板间加可调的电压 U,紧靠金属板右侧的直角三角形 MNP区域内存在方向垂直纸面向外、磁感应强度为B的匀强磁场,MN与右金属板等长且 重合,∠PMN=37°.一比荷为k的粒子(不计重力)从O点以可以忽略的初速度进入金属板间 的电场,经加速后再进入磁场,并从NP边界离开磁场.已知sin 37°=0.6,cos 37°=0.8, 则下列说法正确的是( ) A.左板电势低于右板电势 B.粒子从NP边界离开磁场时的最大速度大小为 C.粒子从NP边界离开磁场时离N点最远距离为L D.要使粒子从NP边界离开磁场,可调电压的变化范围是<U≤ 2.(多选)如图所示为一种质谱仪示意图,由加速电场、静电分析器和磁分析器组成. 若静电分析器通道中心线的半径为R,通道内均匀辐射电场在中心线处的电场强度大小为 E,磁分析器有范围足够大的有界匀强磁场,磁感应强度大小为 B、方向垂直纸面向外.一 质量为m、电荷量为q的粒子从静止开始经加速电场加速后沿中心线通过静电分析器,由 P点垂直边界进入磁分析器,最终打到胶片上的Q点,不计粒子重力.下列说法正确的是( ) A.粒子一定带正电 B.加速电场的电压U=ER C.直径PQ= D.若一群离子从静止开始经过上述过程都落在胶片上同一点,则该群离子具有相同 的电荷量 3.[2022·河北模拟预测]如图所示,在xOy平面直角坐标系中,第一象限内有圆形区域 与两坐标轴相切于a、b两点,圆形区域内存在垂直纸面向里的匀强磁场B(B 大小未知); 1 1 第四象限内存在沿x轴正方向的匀强电场,电场强度大小为E ;第二、三象限有垂直纸面 0 向里的匀强磁场B(B 大小未知),一带负电粒子从a点沿与y轴正方向成60°角的方向射入 2 2 圆形区域磁场,其速度大小为v ,射出磁场后从x轴的c点(图中未画出)垂直x轴射入电场, 0 然后从y轴上的d点(图中未画出)离开电场,粒子经过d点时速度方向与a点速度方向平行, 经y轴左侧匀强磁场偏转后再次经过a点.已知粒子比荷为,粒子重力不计,求: (1)圆形区域磁场的磁感应强度B 的大小; 1 (2)第二、三象限内匀强磁场的磁感应强度B 的大小. 24.[2022·吉林省四校联考]如图所示,平面直角坐标系xOy中第一象限内有沿y轴正方 向的匀强电场,第四象限内有垂直纸面向里的匀强磁场.一质量为m、带电荷量为q的粒 子(不计粒子受到的重力),从点A(0,l)以大小为v 的初速度沿x轴正方向射入电场,在电 0 场中运动一段时间后从点P(6l,0)进入磁场,在磁场中运动一段时间后从 y轴上的Q点(图 中未画出)垂直y轴射出磁场.第二、三象限内无电场和磁场.求: (1)匀强电场的电场强度大小E; (2)匀强磁场的磁感应强度大小B及粒子在磁场中运动的时间. 5.如图所示,虚线MN为匀强电场和匀强磁场的分界线,匀强电场场强大小为E,方 向竖直向下且与边界MN成θ=45°角,匀强磁场的磁感应强度为B,方向垂直纸面向外, 在电场中有一点P,P点到边界MN的竖直距离为d.现将一质量为m、电荷量为q的带正电 粒子从P处由静止释放(不计粒子所受重力,电场和磁场范围足够大).求: (1)粒子第一次进入磁场时的速度大小; (2)粒子第一次出磁场处到第二次进磁场处的距离.6.[2022·云南省昆明市测试]如图所示,y轴左侧有沿x轴正方向的匀强电场,电场强 度为E,屏CD与y轴垂直,OACD为一矩形,OA边长为L,OD边长为2L,矩形OACD 内某区域存在磁感应强度为B的匀强磁场.质量为m、电荷量为q、重力不计的正粒子从x 轴负半轴上的P点由静止释放,从O点进入磁场后最终垂直于屏打到C点,且从x轴PO 段上任意位置由静止释放的同种正粒子最终都能垂直打到屏CD上,求: (1)PO之间的距离x; (2)上述由P点释放的粒子,从P到C经历的时间t; (3)磁场区域的最小面积S.
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  1. CONNECT:[ UseTime:0.001086s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001829s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000729s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000666s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001600s ]
  6. SELECT * FROM `set` [ RunTime:0.000614s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001878s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369581 LIMIT 1 [ RunTime:0.001074s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369581 [ RunTime:0.010297s ]
  10. UPDATE `wendang` SET `lasttime` = 1773089458 WHERE `id` = 369581 [ RunTime:0.001360s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369581 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001365s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369581 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001180s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369581 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008379s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369581 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003462s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369581 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008737s ]
0.215663s