间存在一沿
轴方向的静电场,一带负电的粒子只在电场力作用下沿
轴正向运动,其电势能
随位移
变化的关系如图所示,其中
段是关于直线
对称的曲线,
段是直线,其中
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/cd71710e-e3de-4ddc-ba4e-c0194d402414.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68a83af8bfb3cbe23debe9d7d02f969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd39259ed310719419e83ed4b38de604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971905ea129aec0ca7c325f60260c7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549df127e84a1c2ff00d70a1595d1206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece8a1073b11eb11aed88ae1fc5b365.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/cd71710e-e3de-4ddc-ba4e-c0194d402414.png?resizew=151)
A.![]() |
B.![]() ![]() ![]() ![]() ![]() |
C.粒子在![]() ![]() |
D.![]() ![]() |
更新时间:2023-12-31 16:02:56
|
【知识点】 Ep-x图象
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【推荐1】A、B为电场中一直线上的两个点,带正电的点电荷只受电场力的作用,从A点以某一初速度做直线运动到B点,其电势能Ep随位移x的变化关系如图所示。则从A到B过程中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/10/27/2580031373320192/2580123482308608/STEM/ce1a9554-e82c-4d05-bd8f-42f659c25506.png?resizew=498)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2580031373320192/2580123482308608/STEM/ce1a9554-e82c-4d05-bd8f-42f659c25506.png?resizew=498)
A.点电荷的速度先增大后减小 |
B.电荷所受电场力先减小后增大 |
C.从A到B各点的电势先降低后升高 |
D.从A到B各点的电势先升高后降低 |
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【推荐2】一电荷量为
的带电粒子P,只在电场力作用下沿x轴运动,运动过程中粒子的电势能
与位置坐标x的关系图像如右图曲线所示,图中直线为曲线的切线,切点为
交x轴于
。曲线过点
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/14/2965084721020928/2966540680855552/STEM/fbd7f83b-0c47-40c8-b4dc-6e8dfaf0a4c1.png?resizew=155)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc261f510430ab6245beeef077992e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68a83af8bfb3cbe23debe9d7d02f969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7401c15f5d4f500c6c88be27c8d484d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68dcab5c104614672d336454942bfa8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0da78cb952a28bfb7003f67858d223.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2965084721020928/2966540680855552/STEM/fbd7f83b-0c47-40c8-b4dc-6e8dfaf0a4c1.png?resizew=155)
A.在![]() |
B.在![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
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