当前位置:首页>文档>第1部分专题3微专题5 带电粒子在交变场中的运动_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_209

第1部分专题3微专题5 带电粒子在交变场中的运动_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_209

  • 2026-03-10 14:19:21 2026-03-10 14:19:21

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第1部分专题3微专题5 带电粒子在交变场中的运动_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_209
第1部分专题3微专题5 带电粒子在交变场中的运动_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_209
第1部分专题3微专题5 带电粒子在交变场中的运动_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_209

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微专题 5 带电粒子在交变场中的运动 命题规律 1.命题角度:(1)带电粒子在交变电场中的运动;(2)带电粒子在交变电、磁场中 的运动.2.常用方法:图像法.3.常考题型:选择题、计算题. 考点一 带电粒子在交变电场中的运动 处理带电粒子在交变电场中运动的问题时,先画出粒子在电场方向的 v-t图像,结合图像 去分析粒子的运动情况,在v-t图像中,图线与t轴所围面积表示沿电场方向粒子的位移. 带电粒子在交变电场中运动常见的v-t图像如图所示. 例1 (多选)(2022·天津市模拟)如图甲所示,真空中水平放置两块长度为2d的平行金属板 P、Q,两板间距为d,两板间加上如图乙所示最大值为U 的周期性变化的电压,在两板左 0 侧紧靠P板处有一粒子源A,自t=0时刻开始连续释放初速度大小为v、方向平行于金属板 0 的相同带电粒子,t=0时刻释放的粒子恰好从Q板右侧边缘离开电场,已知电场变化周期T =,粒子质量为m,不计粒子重力及相互间的作用力,则( ) A.在t=0时刻进入的粒子离开电场时速度大小仍为v 0 B.粒子的电荷量为 C.在t=T时刻进入的粒子离开电场时电势能减少了mv2 0 D.在t=T时刻进入的粒子刚好从P板右侧边缘离开电场 学习笔记:__________________________________________________________________ ____________________________________________________________________________ 考点二 带电粒子在交变电、磁场中的运动 1.此类问题是场在时间上的组合,电场或磁场往往具有周期性,粒子的运动也往往具有周期性.这种情况下要仔细分析带电粒子的受力情况和运动过程,弄清楚带电粒子在每一时间 段内在电场、磁场中各处于什么状态,做什么运动,画出一个周期内的运动轨迹,确定带电 粒子的运动过程,选择合适的规律进行解题. 2.解题思路 例2 (2022·广东省模拟)图甲为直角坐标系xOy,y轴正向沿竖直向上方向,其所在空间分 布着均匀的、大小随时间周期性变化的电场和磁场,其变化规律如图乙所示,规定电场强度 方向沿y轴正向为正方向,磁感应强度方向垂直xOy平面向里为正方向.t=0时刻,电荷量 为q、质量为m的带正电粒子在坐标原点O由静止释放,已知电场强度大小E =,磁感应 0 强度大小B=,g取10 m/s2.求: 0 (1)t=1 s末粒子速度的大小和方向; (2)粒子第一次进入磁场时做圆周运动的半径和周期; (3)在0~6 s内粒子运动过程中最高点的位置坐标. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ (2022·湖南岳阳市二模)如图甲所示,在xOy平面的第一象限内存在周期性变化的磁场,规定 磁场垂直纸面向里的方向为正,磁感应强度B随时间t的变化规律如图乙所示.质量为m、 电荷量为+q的粒子,在t=0时刻沿x轴正方向从坐标原点O射入磁场.图乙中T 为未知量, 0 不计粒子的重力(sin 37°=0.6,cos 37°=0.8).(1)若粒子射入磁场时的速度为v,求0~T 时间内粒子做匀速圆周运动的半径; 0 0 (2)若粒子恰好不能从y轴射出磁场,求磁感应强度变化的周期T; 0 (3)若使粒子能从坐标为(d,d)的D点平行于x轴射出,求射入磁场时速度大小. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000524s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000831s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000590s ]
  6. SELECT * FROM `set` [ RunTime:0.000221s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000694s ]
  8. SELECT * FROM `wendang` WHERE `id` = 374018 LIMIT 1 [ RunTime:0.000469s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 374018 [ RunTime:0.018965s ]
  10. UPDATE `wendang` SET `lasttime` = 1773123813 WHERE `id` = 374018 [ RunTime:0.000527s ]
  11. SELECT * FROM `wendang` WHERE `id` < 374018 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `wendang` WHERE `id` > 374018 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004151s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 374018 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000924s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 374018 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001963s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 374018 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000933s ]
0.103960s