电场的电场线如图所示,一正电荷仅在电场力作用下沿直线以初速度v0从a点运动到b点,则该电荷在运动过程的v-t图象可能是( )
![](https://img.xkw.com/dksih/QBM/2021/6/20/2754118164758528/2755060952743936/STEM/cde76f92-cdfc-4243-8f0f-b03bde04d289.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/2021/6/20/2754118164758528/2755060952743936/STEM/cde76f92-cdfc-4243-8f0f-b03bde04d289.png?resizew=178)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2021-07-01 21:28:46
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【知识点】 带电粒子在点电荷电场中的运动
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【推荐1】如图甲,点电荷
、
固定在水平连线上,其延长线有
、
两点,
带正电,检验电荷
仅受电场力作用,
时经过
点,然后沿
向右运动,其
图象如图乙,
、
分别为检验电荷经过
、
两点的速度大小,则( )
![](https://img.xkw.com/dksih/QBM/2021/4/2/2691305515220992/2691979941814272/STEM/88c8febb-83dc-4c4c-a5cb-68ffadd3f086.png?resizew=371)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae863e7a1f1fed09f1075de4a817c63.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/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b2087eadbbd0dab72b7483b9181585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7640ae08eee5da57f69bf06840d4ce.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc52e2fa6b0ba657fad4a8a54cd5539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7daed6a38d376f9ab933f9cd0523b139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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![](https://img.xkw.com/dksih/QBM/2021/4/2/2691305515220992/2691979941814272/STEM/88c8febb-83dc-4c4c-a5cb-68ffadd3f086.png?resizew=371)
A.![]() |
B.从![]() ![]() ![]() |
C.从![]() ![]() |
D.从![]() ![]() ![]() |
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【推荐2】如图所示,A、B、C、D为正方形的四个顶点,O为正方形的中心。在A、C两点固定两电荷量均为q的正点电荷,选无穷远处电势为0,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/970743e2-8d46-42bf-a99c-d03362cc05b2.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/970743e2-8d46-42bf-a99c-d03362cc05b2.png?resizew=164)
A.O点的电场强度为0,电势也为0 |
B.B、D两点的电势相同,电场强度也相同 |
C.电子从B点由静止释放,经过O点时,加速度最大 |
D.电子从B点由静止释放运动到D点的过程中,电势能先变小后变大 |
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