如图1所示,在
坐标系中,两平行极板P、Q垂直于y轴且关于x轴对称,极板长度和板间距均为l,紧靠极板的右边缘的有界匀强磁场区域由
和矩形
构成,其中
,
。磁场方向垂直于
平面向里,D、A位于y轴上。位于极板左侧的粒子源沿
轴向右接连发射质量为
、电荷量为
、速度相同的带电粒子,现在
时间内两板间加上如图2所示的电压,已知
时刻进入两板间的粒子,在
时刻射入磁场时,恰好不会从磁场边界射出磁场区域且圆心在
轴上,上述
、
、
、
为已知量,
,不考虑P、Q两板电压的变化对磁场的影响,也不考虑粒子的重力及粒子间的相互影响,求:
(1)t=0时刻进入两板间的带电粒子射入磁场时的速度;
(2)匀强磁场的磁感应强度的大小及磁场区域的面积;
(3)t=t0时刻进入两板间的带电粒子在匀强磁场中运动的时间。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abac49af241cc15c7834cd9627142627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab158dd9e96abcae0f115f54fa66c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b517b414b2147af2cf0dca6407d2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657f51cb443f86e5beced4423e7b25a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b2087eadbbd0dab72b7483b9181585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f147de20c9736e4560d39420a75721d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9fd58e71dcae6cafaf9037d20ebd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/0d9fd58e71dcae6cafaf9037d20ebd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d58f3347ac450b026cbf2e0c047ffa.png)
(1)t=0时刻进入两板间的带电粒子射入磁场时的速度;
(2)匀强磁场的磁感应强度的大小及磁场区域的面积;
(3)t=t0时刻进入两板间的带电粒子在匀强磁场中运动的时间。
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/484f4c73-6a27-4069-b279-c1830fa82464.png?resizew=471)
23-24高三上·江西南昌·阶段练习 查看更多[2]
更新时间:2024-01-23 17:59:03
|
【知识点】 粒子由电场进入磁场
相似题推荐
解答题
|
较难
(0.4)
名校
【推荐1】如图,在区域I中有方向水平向右的匀强电场,在区域II中有方向竖直向上的匀强电场和垂直纸面向里的匀强磁场,磁感应强度为 B=0.5T;两区域中的电场强度大小相等,E=2V/m;两区域足够大,分界线竖直.一可视为质点的带电小球用绝缘细线拴住静止在区域I中的A点时,细线与竖直方向的夹角为45°.现剪断细线,小球开始运动,经过时间t1=1s从分界线的C点进入区域II,在其中运动一段时间后,从D点第二次经过 B分界线,再运动一段时间后,从H点第三次经过分界线,图中除A点外,其余各点均未画出,g=10m/s2,求:
(1)小球到达C点时的速度v;
(2)小球在区域II中运动的时间t2;
(3)C、H之间的距离d.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/f752ca28-c2a3-4935-8f44-6251c8c1b546.png?resizew=251)
(1)小球到达C点时的速度v;
(2)小球在区域II中运动的时间t2;
(3)C、H之间的距离d.
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较难
(0.4)
名校
【推荐2】如图所示的平面直角坐标系xOy,在第Ⅰ象限内有平行于y轴的匀强电场,方向沿y正方向;在第Ⅳ象限的正三角形abc区域内有匀强磁场,方向垂直于xOy平面向里,正三角形边长为L,且ab边与y轴平行.一质量为m、电荷量为q的粒子,从y轴上的P (0,h)点,以大小为v0的速度沿x轴正方向射入电场,通过电场后从x轴上的 a(2h,0)点进入第Ⅳ象限,又经过磁场从y轴上的某点进入第Ⅲ象限,且速度与y轴负方向成45°角,不计粒子所受的重力.求:
![](https://img.xkw.com/dksih/QBM/2019/2/12/2139344414441472/2165903739609088/STEM/b7879e4d-df57-4fae-90a7-30b00b523b1a.png?resizew=167)
(1)电场强度E的大小;
(2)abc区域内磁场的磁感应强度B的最小值.
![](https://img.xkw.com/dksih/QBM/2019/2/12/2139344414441472/2165903739609088/STEM/b7879e4d-df57-4fae-90a7-30b00b523b1a.png?resizew=167)
(1)电场强度E的大小;
(2)abc区域内磁场的磁感应强度B的最小值.
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解答题
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较难
(0.4)
【推荐3】如图所示,在
平面的第Ⅰ象限半径为
的圆形区域内有垂直于纸面向外的匀强磁场(与
、
轴分别相切于
、
)。第Ⅱ象限内存在方向沿
轴负方向的匀强电场。第Ⅳ象限内存在方向垂直于
平面向里的匀强磁场,两磁场强弱一样。粒子
从
轴上
点处射出,然后以
的水平速度经过
轴上
点,射出圆形磁场与射入时运动方向间的夹角为60°,经过磁场偏转后在
点(图中未画出)穿过
轴。已知
,
。粒子的比荷
,粒子重力不计。求:
(1)此粒子在圆形磁场中运动的半径
和场强
;
(2)粒子
自
点到第二次穿过
轴的时间;(取
)
(3)与粒子
相同的粒子
也从
轴上
点处斜向上射出,同样能水平经过
点,不考虑
、
间作用和相遇,求
、
第二次穿过
轴的距离。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59184d6ca2499b573e99b3b211ca75e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cabd46a1af51f90048a3630ca9ecf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5180418ae896ef96ccdc03571efe0ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895e0de73ccb5302d7d6b41a2baa7ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dd74ae52c32f7b4262a78516d9274e.png)
(1)此粒子在圆形磁场中运动的半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)粒子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb526a84a615236dc9484c873295eb8.png)
(3)与粒子
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceb1e682f2bdc2bce8e44ebc5d0fb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2022/2/12/2914933478998016/2915752520335360/STEM/5e675003-f0a9-4f6c-92d8-a1da58a80a37.png?resizew=299)
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