题目
题型:北京专项题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000412-62679.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000413-29915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000413-44764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000414-41358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000414-93883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000414-26313.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000414-52430.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000415-94341.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000415-20775.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000416-54840.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000416-25222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000416-31496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000416-97640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000417-42150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000417-13434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000417-69062.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000417-96852.gif)
(1)求在区域Ⅰ和Ⅱ中粒子运动速度
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000418-47486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000418-48521.gif)
(2)求在区域Ⅰ和Ⅱ中磁感应强度
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000418-62791.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000418-15244.gif)
(3)若上述两个磁场保持不变,荧光屏仍在初始位置,但从
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000418-65503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000419-25471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000419-40274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000419-81533.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000419-90951.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000420-51247.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000420-14888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000420-20867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000420-86012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000420-46246.gif)
(2)粒子在区域Ⅰ中运动了四分之一圆周后,从C点沿
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000421-14751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000421-12325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000421-88677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000421-55606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000421-96666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000422-99452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000422-76746.gif)
粒子进入区域Ⅱ后做半径为
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000422-13763.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000422-84319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000423-31587.gif)
圆周运动的圆心
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000423-28985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000423-15815.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000423-29228.gif)
圆周运动轨迹方程为
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000423-61136.gif)
将
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000424-19249.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000424-88290.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000424-57988.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000424-56736.gif)
求得:
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000425-36812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000425-20779.gif)
(3)如图所示,粒子先在区域Ⅰ中做圆周运动
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000425-61981.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000425-92315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000426-36250.gif)
轨道半径为
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000426-92255.gif)
由圆心
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000426-73849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000426-27202.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000426-43503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000427-78737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000427-38070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000427-29516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000427-24984.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000428-42821.gif)
粒子进入区域Ⅱ后做圆周运动的半径为
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000428-31841.gif)
其圆心
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000428-13661.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000428-88428.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000428-28508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000429-13114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000429-65175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000429-32272.gif)
其
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000429-87433.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000430-86762.gif)
其
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000430-51257.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000430-93248.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000430-15991.gif)
核心考点
试题【如图所示,圆心在原点、半径为的圆将平面分为两个区域,在圆内区域Ⅰ()和圆外区域Ⅱ()分别存在两个匀强磁场,方向均垂直于平面。垂直于平面放置两块平面荧光屏,其中荧】;主要考察你对粒子在有界磁场中运动等知识点的理解。[详细]
举一反三
B、带电粒子飞入匀强磁场后做匀速圆周运动时,速度一定不变
C、带电粒子飞入匀强磁场后做匀速圆周运动时,洛仑兹力的方向总和运动方向垂直
D、带电粒子飞入匀强磁场后做匀速圆周运动时,动能一定保持不变
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000341-82552.gif)
B、只有质量一定的粒子可以沿中心线通过弯管
C、只有动量大小一定的粒子可以沿中心线通过弯管
D、只有动能一定的粒子可以沿中心线通过弯管
![](http://img.shitiku.com.cn/uploads/allimg/20200115/20200115000333-23299.gif)
B、Bed/m
C、Bed/(2m)
D、Bed/m
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