如图所示,现有包含
和
两种同位素氩离子,它们经同一个加速电场(未画出)从静止状态加速后,垂直左边界进入一个等边三角区域的匀强磁场。已知同位素
在出磁场时也垂直于磁场另一个边界,轨迹如图中曲线所示。设同位素
和
质量分别是
和
,则
和
射出磁场后速度之间的夹角
为(当
很小时,
)( )
![](https://img.xkw.com/dksih/QBM/2021/7/19/2767456660897792/2767472339410944/STEM/b7997354-1355-41f2-b31f-b916403a22e4.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a2d949a4548f661d441e2633e275c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba60f60837f9573b582663a00b1932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba60f60837f9573b582663a00b1932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba60f60837f9573b582663a00b1932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5117a4ebb9f75515916732f85009b68f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba60f60837f9573b582663a00b1932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5117a4ebb9f75515916732f85009b68f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7f2ca74d3be6d1fcfda1b2e19dff2b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/19/2767456660897792/2767472339410944/STEM/b7997354-1355-41f2-b31f-b916403a22e4.png?resizew=211)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2021-07-19 10:19:47
|
【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,直角三角形ABC的边长AB长为L,
为30°,三角形所围区域内存在着磁感应强度大小为B,方向垂直纸面向里的匀强磁场.一质量为m、带电荷量为q的带电粒子(不计重力)从A点沿AB方向射入磁场,在磁场中运动一段时间后,从AC边穿出磁场,则粒子射入磁场时的最大速度vm是( )
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A.![]() | B.![]() |
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单选题-单题
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【推荐2】如图所示,L1和L2为平行线,L1上方和L2下方都是垂直纸面向里的磁感应强度相同的匀强磁场,A、B两点都在L2线上,带电粒子从A点以初速度v与L2线成θ=30°角斜向上射出,经过偏转后正好过B点,经过B点时速度方向也斜向上,不计粒子重力,下列说法中不正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853956925431808/2854078537359360/STEM/e2b88c8a-d146-4ff3-a9b9-9a15fd57d15c.png?resizew=225)
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A.带电粒子一定带正电 |
B.带电粒子经过B点时的速度一定跟在A点的速度相同 |
C.若将带电粒子在A点时的初速度变大(方向不变)它仍能经过B点 |
D.若将带电粒子在A点时的初速度方向改为与L2线成60°角斜向上,它就不再经过B点 |
您最近一年使用:0次