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专题45 电场能的性质_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题45 电场能的性质_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题45 电场能的性质_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题45 电场能的性质_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题45 电场能的性质_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 45 电场能的性质 1.[2021·北京卷]如图所示的平面内,有静止的等量异号点电荷,M、N两点关于两电 荷连线对称,M、P两点关于两电荷连线的中垂线对称.下列说法正确的是( ) A.M点的场强比P点的场强大 B.M点的电势比N点的电势高 C.N点的场强与P点的场强相同 D.电子在M点的电势能比在P点的电势能大 2.[2021·浙江卷1月]如图所示是某一带电导体周围的电场线与等势面,A、C是同一 等势面上的两点,B是另一等势面上的一点.下列说法正确的是( ) A.导体内部的场强左端大于右端 B.A、C两点的电势均低于B点的电势 C.B点的电场强度大于A点的电场强度 D.正电荷从A点沿虚线移到B点的过程中电场力做正功,电势能减小 3.[2021·广东卷]如图是某种静电推进装置的原理图,发射极与吸极接在高压电源两端, 两极间产生强电场,虚线为等势面.在强电场作用下,一带电液滴从发射极加速飞向吸极 a、b是其路径上的两点.不计液滴重力.下列说法正确的是( ) A.a点的电势比b点的低 B.a点的电场强度比b点的小 C.液滴在a点的加速度比在b点的小 D.液滴在a点的电势能比在b点的大4.[2022·广西“韬智杯”大联考](多选)如图所示,在某孤立点电荷形成的电场中有 A、B 两点,已知 A、B 两点的场强方向如图所示,下列选项正确的是( ) A.某检验电荷在A点受的电场力等于在B点受的电场力 B.某检验电荷在A点受的电场力大于在B点受的电场力 C.某检验电荷在A点的电势能一定大于在B点的电势能 D.某检验电荷在A点的电势能可能小于在B点的电势能 5.[2022·河北省石家庄市期中]真空中某点电荷的等势面示意图如图所示,图中相邻等 势面间电势差相等,已知正电荷在Q点的电势能大于其在P点的电势能.下列说法正确的 是 ( ) A.该点电荷为正电荷 B.P点的电势比Q点的电势高 C.P点的电场强度小于Q点的电场强度 D.把另一带负电的点电荷从P点移到Q点,电场力做正功 6.[2022·吉林省期中考试]如图所示,一个绝缘光滑半圆环轨道处于竖直向下的匀强电 场E中,在轨道的上端,一个质量为m、带电荷量为+q的小球由静止开始沿轨道运动, 则( ) A.小球运动过程中机械能守恒 B.小球机械能和电势能的总和先增大后减小 C.在最低点球对轨道的压力为(mg+qE) D.在最低点球对轨道的压力为3(mg+qE) 7.[2022·浙江省宁波市模拟](多选)如图所示,空间中存在竖直向上的匀强电场,将一 绝缘带电小球自C点静止释放,一段时间后小球与正下方弹簧在A点开始接触并压缩弹簧,假设从释放到最低点B的过程中电场力对小球做功-5 J,弹簧形变始终处于弹性限度范围, 不计空气阻力,下列说法正确的是( ) A.小球反弹后可重新到达C点 B.从C点到B点,小球与弹簧的机械能减少5 J C.小球从A运动到B过程中速度一直在减少 D.小球动能最大的位置在AB之间小球重力和弹簧弹力大小相等的位置 8.[2022·黑龙江省哈尔滨三中验收]如图所示为雷雨天一避雷针周围电场的等势面分布 情况,在等势面中有A、B、C三点,其中A、B两点位置关于避雷针对称.下列说法中正 确的是( ) A.某不计重力的正电荷在A、B两点的加速度相同 B.某正电荷在C点的电势能小于B点的电势能 C.某负电荷从C点移动到B点,电场力做负功 D.C点场强大于B点场强 9.[2022·广东省联考三]如图所示,边长l=5 cm的正方形abcd区域处于匀强电场(图 中未画出)中,其中ab边恰与电场线平行,O为abcd的中心.已知将一电子自b点移到O 的过程中,克服电场力做功3 eV.现再将一正点电荷固定于O点,下列说法正确的是( ) A.a、c两点的电场强度相同 B.a、b两点的电势差U =6 V ab C.匀强电场的电场强度大小为E=1.2×102 V/m D.将电子自a点沿ad连线移到d点的过程中,电子的电势能始终不变 10.[2022·吉林省考试](多选)如图所示,在匀强电场中,有边长为5 cm的等边三角形 ABC,三角形所在平面与匀强电场的电场线平行,O点为该三角形的中心,三角形各顶点 的电势分别为φ =1 V、φ =3 V、φ =5 V,下列说法正确的是( ) A B C A.O点电势为3 V B.匀强电场的场强大小为80 V/m,方向由A指向C C.在三角形ABC外接圆的圆周上电势最低点的电势低于1 VD.将电子由C点移到A点,电子的电势能增加了4 eV 11.[2022·安徽省九师联盟联考]如图所示,在竖直平面内,一绝缘细线的一端固定在 O点,另一端系一质量为m、带电荷量为q(q>0)的小球(可视为质点).弧AB是以O点为圆心、 半径为r的竖直圆弧,OA是圆弧的竖直半径,OB是圆弧的水平半径.一带电荷量为 Q(Q>0)的点电荷固定在B点的正上方高度为r的C点.现将小球拉至A点由静止释放(细线 恰好伸直),已知重力加速度为g,静电力常量为k,不计空气阻力. (1)求释放瞬间小球的加速度大小a; (2)在A点给小球水平向左的初速度v ,小球沿圆弧运动到B点,求小球运动到B点时 0 的速度大小v . B 12.[2022·广东省六校联考]如图所示,空间内存在水平向右的匀强电场,场强大小为 E,长为L的轻质绝缘细绳一端连接小球,另一端固定在O点,小球带电量为+q.现使小球 处于与O点等高处,此时细绳自然伸直.静止释放小球,小球运动过程中到M点时的动能 最大,已知OM与水平方向夹角θ=60°,不计空气阻力,求: (1)小球达到M点时的动能; (2)若细绳能承受最大拉力为小球所受电场力的18倍,现在OM直线上的P点固定一光 滑小钉子(未画出),要使细绳碰到钉子后小球能做完整的圆周运动,求MP的距离?
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  1. CONNECT:[ UseTime:0.000599s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000796s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000581s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369102 LIMIT 1 [ RunTime:0.004747s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369102 [ RunTime:0.000676s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086658 WHERE `id` = 369102 [ RunTime:0.000549s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369102 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000495s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369102 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001513s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369102 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011282s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369102 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010206s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369102 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013984s ]
0.118329s