如图所示,在
、
的长方形区域有垂直于
平面向外的匀强磁场,磁感应强度大小为
,坐标原点
处有一个粒子源,在某时刻发射大量质量为m、电荷量为
的带正电粒子(重力不计),它们的速度方向均在
平面内的第一象限,且与y轴正方向的夹角分布在
范围内,速度大小不同,且满足
,已知粒子在磁场中做圆周运动的周期为T,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/17a6fe62-1e40-4a78-969e-2163556bd03e.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d2e6e002aca2444ccac35ee2a1fa30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ff5a2d611f82bc493c5b9e639f5711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8b416048438c571ca40255db7de7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299ce715de8dda324526442bd4147889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8b6fa91dcb2fb1be88d451d0f22aa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/17a6fe62-1e40-4a78-969e-2163556bd03e.png?resizew=214)
A.从磁场上边界飞出的粒子经历的最短时间为![]() |
B.从磁场上边界飞出的粒子经历的最短时间小于![]() |
C.从磁场中飞出的粒子经历的最长时间为![]() |
D.从磁场中飞出的粒子经历的最长时间小于![]() |
更新时间:2023-03-14 08:49:19
|
【知识点】 带电粒子在直边界磁场中运动
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较难
(0.4)
【推荐1】如图所示,在xoy平面的第Ⅰ象限内存在垂直xoy平面向里、磁感应强度大小为B的匀强磁场,两个相同的带电粒子以相同的速度
先后从y轴上坐标
的A点和B点
坐标未知
垂直于y轴射入磁场,在x轴上坐标
的C点相遇,不计粒子重力及其相互作用
根据题设条件可以确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2018/6/29/1977703647846400/2019967469633536/STEM/ea735baf8d4f47db9ef93a0b4114ef29.png?resizew=102)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb979056b1817d3bc4f7904ee26dc98.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
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![](https://img.xkw.com/dksih/QBM/2018/6/29/1977703647846400/2019967469633536/STEM/ea735baf8d4f47db9ef93a0b4114ef29.png?resizew=102)
A.带电粒子在磁场中运动的半径 |
B.B点的位置坐标为![]() |
C.两个带电粒子在磁场中运动的时间 |
D.带电粒子的质量 |
您最近一年使用:0次
多选题
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较难
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名校
【推荐2】如图甲所示,
是一长方形有界匀强磁场边界,磁感应强度按图乙规律变化,取垂直纸面向外为磁场的正方向,图中
,一质量为
、电荷量为
的带正电粒子以速度
在
时从
点沿
方向垂直磁场射入,粒子重力不计.则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d218de241c065cd6ba8e9cd8b2d52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.若粒子经时间![]() ![]() ![]() |
B.若粒子经时间![]() ![]() ![]() |
C.若要使粒子恰能沿![]() ![]() ![]() |
D.若要使粒子恰能沿![]() ![]() ![]() |
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