当前位置:首页>文档>专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题47电场力的性质_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题 47 电场力的性质 1.如图所示为四幅电场线图,一正电荷在电场中由 P到Q做加速运动且所受电场力 越来越大,那么它是在哪个图示电场中运动( ) 2.如图所示,质量为m、带电荷量为q的小球B用绝缘细线悬挂,处于固定的带电体 A产生的电场中.当小球B静止时,A、B等高,细线偏离竖直方向的夹角为θ.已知重力加 速度为g.则带电体A在B处所产生的场强大小为( ) A. B. C. D. 3.[2022·黑龙江省哈尔滨三中模拟]如图是等量异种点电荷、等量同种正点电荷、负点 电荷、正点电荷电场的电场线.其中,等量同种、等量异种点电荷电场中的 A、B两点关 于两电荷连线的中点O对称,则A、B两点电场强度相同的是( ) 4.如图,空间存在一方向水平向右的匀强电场,两个带电小球P和Q用相同的绝缘 细绳悬挂在水平天花板下,两细绳都恰好与天花板垂直,则( ) A.P和Q都带正电荷 B.P和Q都带负电荷 C.P带正电荷,Q带负电荷 D.P带负电荷,Q带正电荷 5.[2021·湖南卷]如图,在(a,0)位置放置电荷量为q的正点电荷,在(0,a)位置放置电荷 量为q的负点电荷,在距P(a,a)为a的某点处放置正点电荷Q,使得P点的电场强度为零. 则Q的位置及电荷量分别为( ) A.(0,2a),q B.(0,2a),2q C.(2a,0),q D.(2a,0),2q 6. [2022·张家口市期末]如图所示,均匀带正电的金属圆环的圆心为 O,在垂直于圆环所 在平面且过圆心O的轴线上有A、B、C三点,AO=OB=BC=L,当B点放置电荷量为Q 的负点电荷时,A点的电场强度为0.若撤去B点的负点电荷,在C点放置电荷量为2Q的 正点电荷时,B点的电场强度大小为(k为静电力常量)( ) A. B. C. D. 7. [2022·重庆市一诊](多选)如图所示,有一长为L的绝缘细绳,一端悬挂在A点,另一 端拴一质量为m、电荷量为q的带负电荷的小球;悬点A处固定一正电荷,电荷量也为q. 同时竖直方向存在匀强电场,如果小球能在竖直平面内做匀速圆周运动.若已知重力加速 度为g,则( ) A.匀强电场的方向一定竖直向下 B.小球做匀速圆周运动的最小速度为 C.小球到达最低点B时速度的最小值为 D.匀强电场的场强大小可能为 8. [2022·河南省部分名校巩固卷](多选)如图所示,空间中A、B两点存在等量异种点电荷, A点电荷量为+Q,B点电荷量为-Q,A、B、C为以O点为圆心的圆上的三等分点,下 列判断正确的是( ) A.将试探电荷由C移到O点,电场力不做功 B.O、C两点的场强大小可能相同 C.O、C两点的场强方向一定相同 D.将试探电荷沿圆周运动,电场力不做功 9.[2022·江苏省常州市期中]三根电荷均匀分布带有相同正电荷的圆弧状棒AB、CD、EF 按如图放置,其端点均在两坐标轴上,此时O点电场强度大小为E.现撤去AB棒,则O点 的电场强度大小变为( ) A.E B.E C.E D.E 10.如图所示,空间内有竖直向上的匀强电场E,将质量为m、带电量为+q的小球恰 好以某一速度在内壁光滑的漏斗中做水平面内的匀速圆周运动.轨道平面与地面的距离为 h,漏斗壁与水平方向的夹角为θ.已知匀强电场E=,空气阻力忽略不计.下列选项正确的 是 ( ) A.小球做匀速圆周运动的线速度与轨道高度h成正比 B.小球做匀速圆周运动的向心加速度与轨道高度h无关 C.某时刻撤掉漏斗后,小球的落地点无法确定 D.某时刻撤掉漏斗后,小球将做平抛运动,且机械能守恒 11. [2022·广东省联考三]如图所示,绝缘支架静置于水平桌面上,顶端固定一电荷量为 Q 的带正电金属小球(看成点电荷),支架与金属小球的总质量为M.一电荷量分布均匀、半径 为R的金属圆环恰能水平静止于小球正上方,圆心O离小球的距离为h.已知圆环的质量为 m,重力加速度为g,下列说法正确的是( ) A.支架对桌面的压力大于(M+m)g B.支架对桌面的压力小于(M+m)g C.圆环所带电荷量q= D.圆环所带电荷量q= 12.[2022·江苏省盐城市期中调研]如图所示,光滑绝缘直杆ABCD水平放置并固定不 动,其中AB=BC=CD=L,杆上套有质量为m、电量为+q的小球(可视为质点),小球通 过绝缘轻质弹簧与固定点O连接,直杆A处固定电量为+9q的点电荷,小球从B处由静止 开始释放,运动到D处时速度恰好达到最大值v .OC垂直于直杆,且OC为弹簧自然长, m 静电力常量为k,求:(1)BD两点间的电势差U ; BD (2)小球刚释放时的加速度大小a; (3)小球运动到D处时,C处的电场强度E.
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  1. CONNECT:[ UseTime:0.000765s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000957s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000216s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000513s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000590s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369140 LIMIT 1 [ RunTime:0.000899s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369140 [ RunTime:0.003826s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086841 WHERE `id` = 369140 [ RunTime:0.000405s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369140 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000667s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369140 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000546s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369140 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004820s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369140 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005939s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369140 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010889s ]
0.179289s