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更新时间:2021-09-16 16:20:20
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【知识点】 带电粒子在直边界磁场中运动
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【推荐1】如图所示,平行边界
、
间有垂直纸面向里匀强磁场,磁场的磁感应强度为
,两边界间距为
上有一粒子源
,可在纸面内沿各个方向向磁场中射入质量均为
、电荷量均为
的带正电子的粒子,粒子射入磁场的速度
,不计粒子的重力,则粒子能从
边界射出的区域长度为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/ae389bf6-d47f-4292-a8e7-7022f654cdd1.png?resizew=119)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc0b1f7efe2b6ba33386d97bf7cff2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/ae389bf6-d47f-4292-a8e7-7022f654cdd1.png?resizew=119)
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【推荐2】如图所示,空间存在垂直纸面向里的匀强磁场,从P点平行直线MN射出的a、b两个带电粒子,它们从射出第一次到直线MN所用的时间相等,到达MN时速度方向与MN的夹角分别为60°和90°,不计重力,则两粒子速度之比va:vb为( )
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387835449344/1631090541985792/STEM/da579d06-475c-49d8-a1cf-98fbcf051ef5.png?resizew=212)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387835449344/1631090541985792/STEM/da579d06-475c-49d8-a1cf-98fbcf051ef5.png?resizew=212)
A.2:1 | B.3:2 |
C.4:3 | D.![]() |
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