如图所示,在光滑绝缘水平面的P点正上方O点固定了一电荷量为
的正点电荷,在水平面上的N点,由静止释放质量为m,电荷量为
的检验电荷,该检验电荷经过P点时速度为v,图中
,规定电场中P点的电势为零。已知OP的距离为L,则在
形成的电场中,求:
(1)P、N两点电场强度大小的比值;
(2)检验电荷在N点具有的电势能;
(3)当检验电荷运动到NP之间距离P点L处时的加速度。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5175b86824bdf7cd52c6e8dc524d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0363d58ecc0cdfbe3464076b8820e011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72bf0fce80daad394f2a9d013829c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5175b86824bdf7cd52c6e8dc524d0a.png)
(1)P、N两点电场强度大小的比值;
(2)检验电荷在N点具有的电势能;
(3)当检验电荷运动到NP之间距离P点L处时的加速度。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/dd1b494d-9f4a-4ead-a035-244c92d36b49.png?resizew=216)
更新时间:2023-11-03 20:38:20
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【知识点】 带电粒子在点电荷电场中的运动
相似题推荐
解答题
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适中
(0.65)
【推荐1】如图所示,固定于同一条竖直线上的A、B是两个带等量异种电荷的点电荷,电荷量分别为+Q和-Q,A、B相距为2d,MN是竖直放置的光滑绝缘细杆,另有一个穿过细杆的带电小球p,质量为m、电荷量为+q(可视为点电荷,不影响电场的分布),现将小球p从与点电荷A等高的C处由静止开始释放,小球p向下运动到距C点距离为d的O点时,速度为v,已知MN与AB之间的距离为d,静电力常量为k,重力加速度为g。求:
(1)C、O间的电势差
;
(2)小球p经过O点时的加速度。
(1)C、O间的电势差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174053293d28ca5178694ea71778216c.png)
(2)小球p经过O点时的加速度。
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981274524213248/2982002573959168/STEM/69ab9f32-bec2-494d-bb20-1e3bde81a1e5.png?resizew=99)
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解答题
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适中
(0.65)
名校
【推荐2】在绝缘粗糙的水平面上相距为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
的
、
两处分别固定电量不等的正电荷,两电荷的位置坐标如图(甲)所示,已知
处电荷的电量为+
.图(乙)是
连线之间的电势φ与位置
之间的关系图象,图中
点为图线的最低点,
处的纵坐标
,
处的纵坐标φ=
,
处的纵坐标φ=
.若在
的
点由静止释放一个质量为
、电量为
的带电物块(可视为质点),物块随即向右运动.求:
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331512173600768/2332208999620608/STEM/69226d66-008c-4e42-8896-3fab17476b42.png?resizew=594)
(1)固定在
处的电荷的电量
;
(2)为了使小物块能够到达
处,试讨论小物块与水平面间的动摩擦因数
所满足的条件;
(3)若小物块与水平面间的动摩擦因数
,小物块运动到离A点LA处时,速度最大,写出距离LA的方程表达式,并求最大速度
是多少?(LA=3L)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890f3d95ac291413b66b12e949bf1597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc335d7d2849fa92e7c5bbd759b830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c307da4e1e1b944fc14175c5076a8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fef57584523e293a6f482bb4cf31c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9235a7374bae5126610a36f4fdcfc5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a82ba108ae6660ad9a4e8c6c62f0050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822e0a0c7a28cc04a1c1c83f473af44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc335d7d2849fa92e7c5bbd759b830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b2087eadbbd0dab72b7483b9181585.png)
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331512173600768/2332208999620608/STEM/69226d66-008c-4e42-8896-3fab17476b42.png?resizew=594)
(1)固定在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5982d6c679ca4b3c56136721098aec22.png)
(2)为了使小物块能够到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a82ba108ae6660ad9a4e8c6c62f0050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(3)若小物块与水平面间的动摩擦因数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b9de87253a854a05eb0c598e6ecd36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8f70377894ffb0963d2e9b501e82cb.png)
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