如图所示,在
坐标系的第一象限内,有一段以坐标原点为圆心的四分之一圆弧ab,a点的坐标为(0,3),点的坐标为(3,0),ac段弧长是bc段弧长的2倍.空间有平行于坐标轴平面的匀强电场,a、c两点的电势均为1V,b点的电势为
,则下列说法正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/6038053e-8e78-45b9-8041-8537c2221d48.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe4add7d9d2306b6ed0975063eab30e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/6038053e-8e78-45b9-8041-8537c2221d48.png?resizew=146)
A.匀强电场的电场强度方向与![]() |
B.匀强电场的电场强度大小为![]() |
C.一个带正电的电荷沿圆弧从a运动到b,电势能先增大后减小 |
D.坐标原点O的电势为![]() |
更新时间:2019-09-04 16:13:16
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【推荐1】如图,边长为2cm的正六边形,O点为中心。一匀强电场平行于六边形平面.现有一电子(不计重力),仅在电场力作用下从A移动到B点,电势能增加6eV;把电子从C移动到D点,电势能减小3eV。取O点电势φO=0,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2017/5/15/1687553887043584/1752442133733376/STEM/da848426-d54d-4a49-b4ef-a8fd76f317eb.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/2017/5/15/1687553887043584/1752442133733376/STEM/da848426-d54d-4a49-b4ef-a8fd76f317eb.png?resizew=154)
A.匀强电场方向由A指向E |
B.电场强度的大小300V/m |
C.φE=6V |
D.电子从F点移到E点电势能增加3eV |
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【推荐2】粗糙绝缘的水平面上方存在一个平行于水平面的电场,其中某一区域的电场线与x轴平行,在x轴上的电势
与坐标x的变化关系用如图所示的曲线表示,图中虚线为该曲线过点
的切线。现有一质量
、带电荷量
的滑块P(可视作质点),从
处由静止释放,
处对应电势约为
,滑块P与水平面间的动摩擦因数
。取重力加速度
。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/bea6e82f-2950-4dec-9b2f-a03c7a42097e.png?resizew=222)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e2d5c0f63f61c466145a70ac7f1d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4121db773f506cc9623788ecf8c519c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d49e5bf9a2788f0249aed5ab7e572a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d6f492f421507fa80f6a9c161f883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d6f492f421507fa80f6a9c161f883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1acc87a6c692cb951a648527d83ef232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61964ab960a18c9a7c757ddc4153472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/bea6e82f-2950-4dec-9b2f-a03c7a42097e.png?resizew=222)
A.![]() ![]() |
B.滑块从![]() ![]() ![]() |
C.滑块运动的最大速度大小约为![]() |
D.滑块最终在![]() |
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【推荐1】如图所示,一匀强电场的方向与平行四边形
所在平面平行。已知
长
,
长
,
,A、B、C三点的电势分别为
、
、
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3107a7de-9841-46c2-801d-5cb40c8db80b.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c280b0355df216440f40aefdcafcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6f36741b86f464be362b12bac13d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce9e16685e67e9c8a1f05942ece7069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3088c2099211295de775ee33dd1d03fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b22d5fc8cf8263631fc19a72a62a6b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3107a7de-9841-46c2-801d-5cb40c8db80b.png?resizew=166)
A.D点电势为0 |
B.电子在B点的电势能比在C点的电势能低 |
C.电子从A点运动到D点,电场力做的功为2eV |
D.匀强电场的场强大小为![]() |
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【推荐2】如图所示,
、
、
三点在同一水平面上,
点在
点正上方,
垂直于
和
构成的平面,
、
、
到
的距离均为
,空间存在着匀强电场,一个质量为
、电荷量为
的粒子从
移到
和从
移到
时电场力做的功都为零,从
移到
时电场力做的功为
,下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/2020/1/4/2370031702843392/2370360388239360/STEM/991a4753-1728-4e2c-a776-50e1aa48480c.png?resizew=211)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/2020/1/4/2370031702843392/2370360388239360/STEM/991a4753-1728-4e2c-a776-50e1aa48480c.png?resizew=211)
A.带电粒子从![]() ![]() |
B.电场强度方向由![]() ![]() |
C.![]() ![]() ![]() |
D.匀强电场的电场强度大小![]() |
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【推荐1】如图所示,平行直线
、
、
、
、
分别表示电势为-4V、-2V、0、2V、4V的等势线若
,且与直线MN成
角,则( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/d220f7c3-e570-4137-84d6-4697cc88def2.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1869944e08e58918548d596f60ac6795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/d220f7c3-e570-4137-84d6-4697cc88def2.png?resizew=136)
A.该电场是匀强电场,电场强度方向垂直于![]() |
B.该电场是匀强电场,电场强度方向垂直于![]() |
C.该电场是匀强电场,离C点的距离为2 cm的所有点中,最高电势为4V,最低电势为-4V |
D.该电场可能不是匀强电场 |
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【推荐2】如图所示,在光滑绝缘水平面上有一半径为R的圆,AB是一条直径,空间有与水平面平行的匀强电场,场强大小为E.在圆上A点有一发射器,以相同的动能平行于水平面沿不同方向发射带电量为+q的小球,小球会经过圆周上不同的点,在这些点中,以过C点的小球动能最大,且AC两点间的距离为
R.忽略小球间的相互作用,下列说法正确的是
![](https://img.xkw.com/dksih/QBM/2019/4/2/2173687004774400/2174685295460353/STEM/5477a994-e96d-4e97-bf40-cdbba837bae8.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/4/2/2173687004774400/2174685295460353/STEM/5477a994-e96d-4e97-bf40-cdbba837bae8.png?resizew=139)
A.电场的方向与AB间的夹角为30° |
B.电场的方向与AB间的夹角为60° |
C.若A点的电势φA=0,则C点的电势φC=-1.5ER |
D.若在A点以初动能Ek0发射的小球,则小球经过B点时的动能EkB=Ek0+![]() |
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