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第11章专题强化练108 动态圆_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_一轮复习85练

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第11章专题强化练108 动态圆_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_一轮复习85练
第11章专题强化练108 动态圆_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_一轮复习85练
第11章专题强化练108 动态圆_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_一轮复习85练
第11章专题强化练108 动态圆_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_一轮复习85练
第11章专题强化练108 动态圆_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_一轮复习85练

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1.(多选)如图所示,在Ⅰ、Ⅱ两个区域内存在磁感应强度大小均为B的匀强磁场,磁场方向 分别垂直于纸面向外和向里,AD、AC边界的夹角∠DAC=30°,边界AC与边界MN平行, Ⅱ区域宽度为d.质量为m、电荷量为+q的粒子可在边界AD上的不同点射入,入射速度垂 直AD且垂直磁场,若入射速度大小为,不计粒子重力,则( ) A.粒子在磁场中运动的半径为 B.粒子在距A点0.5d处射入,不会进入Ⅱ区域 C.粒子在距A点1.5d处射入,在Ⅰ区域内运动的时间为 D.能够进入Ⅱ区域的粒子,在Ⅱ区域内运动的最短时间为 2.如图,虚线所示的圆形区域内存在一垂直于纸面的匀强磁场,P为磁场边界上的一点,大 量相同的带电粒子以相同的速率经过P点,在纸面内沿不同的方向射入磁场,若粒子射入 速率为v,这些粒子在磁场边界的出射点分布在六分之一圆周上;若粒子射入速率为v,相 1 2 应的出射点分布在三分之一圆周上.不计重力及带电粒子之间的相互作用,则v∶v 为( 2 1 ) A.∶2 B.∶1 C.∶1 D.3∶ 3.(多选)如图所示,纸面内有宽为L、水平向右飞行的带电粒子流,粒子质量为m、电荷量 为-q(q>0)、速率为v ,不考虑粒子的重力及粒子间的相互作用,要使粒子都会聚到一点, 0 可以在粒子流的右侧虚线框内设计一匀强磁场区域,则磁场区域的形状及对应的磁感应强度 可以是下列选项中的(其中B =,A、C、D选项中曲线均为半径为L的圆弧,B选项中曲线 0 为半径为的圆)( )4.如图所示,在x轴的上方(y≥0)存在着垂直于纸面向里的匀强磁场(未画出),磁感应强度大 小为B.在原点O有一个离子源向x轴上方的各个方向发射出质量为m、带电荷量为q的正离 子,速率都为v.对那些在xOy平面内运动的离子,在磁场中可能到达的位置中离x轴及y轴 最远距离分别为( ) A. B. C. D. 5.(多选)如图所示,平行线MN、PQ间有垂直纸面向外的匀强磁场,磁场的磁感应强度大小 为B,MN、PQ间的距离为L.在MN上的a点有一粒子源,可以沿垂直于磁场的各个方向射 入质量为m、电荷量为q的带负电的粒子,且这些粒子的速度大小相等.这些粒子经磁场偏 转后,穿过PQ边界线的最低点为b点.已知c是PQ上的一点,ac垂直于PQ,c、b间的 距离为L,则下列说法正确的是( ) A.粒子在磁场中做圆周运动的半径为L B.粒子在磁场中运动的速度大小为 C.粒子从PQ边射出的区域长为LD.沿斜向下与MN夹角为30°方向射入的粒子恰好从c点射出磁场 6.(2020·全国卷Ⅰ·18)一匀强磁场的磁感应强度大小为B,方向垂直于纸面向外,其边界如 图中虚线所示,ab为半圆,ac、bd与直径ab共线,ac间的距离等于半圆的半径.一束质量 为m、电荷量为q(q>0)的粒子,在纸面内从c点垂直于ac射入磁场,这些粒子具有各种速 率.不计粒子之间的相互作用.在磁场中运动时间最长的粒子,其运动时间为( ) A. B. C. D. 7.如图所示,真空中垂直于纸面向里的匀强磁场只在两个同心圆所夹的环状区域存在(含边 界),两圆的半径分别为R、3R,圆心为O.一重力不计的带正电粒子从大圆边缘的P点沿PO 方向以速度v 射入磁场,其运动轨迹如图,轨迹所对的圆心角为120°.当将该带电粒子从P 1 点射入的速度大小变为v 时,不论其入射方向如何,都不可能进入小圆内部区域,则 v∶v 2 1 2 至少为( ) A. B. C. D.2 8.(2023·广东佛山市模拟)如图所示,宽为d的混合粒子束由速率为3v、4v、5v的三种带正 电的离子组成.所有离子的电荷量均为q、质量均为m,当三种速率的离子水平向右进入匀 强磁场,磁场方向垂直纸面向外.在入口处,紧靠粒子束的下边缘竖直放置一个长度为 2d 的薄吞噬板MN.忽略离子重力及离子间相互作用,若使这些离子都能打到吞噬板 MN上,则 磁感应强度大小的取值范围是( ) A.
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  1. CONNECT:[ UseTime:0.000675s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000919s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000394s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000339s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000671s ]
  6. SELECT * FROM `set` [ RunTime:0.000247s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000792s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373550 LIMIT 1 [ RunTime:0.000564s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373550 [ RunTime:0.024281s ]
  10. UPDATE `wendang` SET `lasttime` = 1773118955 WHERE `id` = 373550 [ RunTime:0.005509s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373550 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001895s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373550 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009411s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373550 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005899s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373550 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001532s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373550 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005259s ]
0.135893s