如图所示,边长为L的正方形区域内存在垂直纸面向里的匀强磁场。一个带电粒子静止在正方形的中心O处,某时刻分裂成两个带正电的粒子
、
,粒子
从中心O水平向左射出,经一段时间
、
两粒子同时射出磁场区域,已知粒子
恰从A处飞出磁场,粒子
从CD边某处飞出,飞出磁场时速度与CD边的夹角为
,若忽略重力和粒子间相互作用力,则下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671425425285120/2672979741089792/STEM/6acc7ffb-de6e-4c24-a864-381a330e1253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bf2423499d45354dbc8377f1f04e16.png)
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671425425285120/2672979741089792/STEM/6acc7ffb-de6e-4c24-a864-381a330e1253.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
更新时间:2021-03-07 22:14:06
|
【知识点】 带电粒子在直边界磁场中运动
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【推荐1】在如图所示的矩形区域内分布着垂直纸面向外的匀强磁场,
为磁场分界线,上方区域的磁感应强度大小为
。质量为
、电荷量为
的粒子从与
点相距为
的P点垂直MN射入上方磁场,经
点第一次进入下方磁场,且
,磁场沿
、
方向范围足够大,不计粒子重力,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/33665f90-bc87-455c-a517-dabb3612aa2c.png?resizew=163)
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A.粒子射入磁场时的速度大小为![]() |
B.当下方磁感应强度![]() ![]() |
C.当下方磁感应强度![]() ![]() |
D.当下方磁感应强度![]() ![]() ![]() |
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【推荐2】如图边长为L的正方形区域ABCD内存在垂直于纸面的匀强磁场,两个相同的放射源同时发射的两个
粒子甲、乙在磁场内发生弹性正碰,碰撞时间极短。已知甲从AC边中点垂直AC入射,乙沿AB内侧从B点平行于AB入射,放射源利用
衰变发射粒子,粒子速度为
(c为真空中光速),
粒子的比荷为k,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.放射源衰变方程为![]() |
B.磁感应强度方向垂直于纸面向外,大小为![]() |
C.乙粒子出射点距A点的距离为![]() |
D.甲粒子在磁场区域内运动时间为![]() |
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