当前位置:首页>学习笔记>【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第一章第三节第2课时电场线匀强电场

【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第一章第三节第2课时电场线匀强电场

  • 2026-03-26 22:50:06
【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第一章第三节第2课时电场线匀强电场

[学习目标] 1.知道什么是电场线并掌握电场线的特点。2.会用电场线描述电场,熟记几种常见的电场线(重点)。3.知道孤立正负点电荷、等量同种(异种)点电荷电场线的分布特点,掌握两个等量同种(异种)点电荷连线及中垂线上的电场变化规律(重难点)。4.知道什么是匀强电场以及匀强电场的特点(重点)。

一、电场线

1.定义:在电场中画出一系列有方向的曲线,使曲线上每一点的________方向都和该处的场强方向一致,这样的曲线就叫作电场线,如图所示。

2.特点

(1)电场线从________电荷或无限远出发,终止于________或负电荷。

(2)同一幅电场线分布图中,场强越大的地方,电场线越________;场强越小的地方,电场线越疏。电场线的________程度反映了场强的相对大小。

(3)任意两条电场线都不________,这是因为电场中每一点处的场强只能有一个确定的方向。

(1)在电场中,凡是有电场线通过的点,电场强度不为零,不画电场线的区域内的点,电场强度为零。(  )

(2)在同一电场中,同一试探电荷在电场线相对密集的地方所受电场力较大。(  )

(3)电荷在电场中运动轨迹一定与电场线重合。(  )

(多选)(2023·揭阳市高二期末)如图所示,带箭头的直线是某一电场中的一条电场线,在这条线上有AB两点,用EAEB表示AB两处的场强,则(  )

A.AB两处的场强方向相同

B.因为AB在一条电场线上,且电场线是直线,所以EAEB

C.电场线从A指向B,所以EA>EB

D.不知AB附近电场线的分布情况,EAEB的大小不能确定

二、几种常见的电场线

1.常见的几种电场线分布图

2.等量异种电荷,如图所示。根据场强叠加原理完成下列填空:

(1)从左向右两点电荷之间连线上的电场强度大小变化情况________,O点场强________,在O点左侧电场强度方向________,在O点右侧电场强度方向________,关于O点对称的AB两点场强________。

(2)从两点电荷连线中点O沿中垂线到无穷远,电场强度变化情况是________;中垂线上各点场强方向________均________,关于O点对称的CD两点场强________。

(3)两点电荷产生的电场中,任何关于O点对称的两点场强大小________、方向________,关于连线对称但不关于O点对称的两点场强大小________、方向________,关于中垂线对称的两点场强大小________、方向不同。

3.等量同种电荷,如图所示。

根据场强叠加原理完成下列填空:

(1)从左向右两点电荷之间连线上的电场强度大小变化情况是________;O点场强为________;在O点左侧电场强度方向________,在O点右侧电场强度方向________;关于O点对称的AB两点场强大小________、方向________。

(2)从两点电荷连线中点O沿中垂线到无穷远,电场强度大小变化情况是________;在O点上方电场强度方向________,在O点下方电场强度方向________、关于O点对称的CD两点,场强大小________、方向________。

(3)两点电荷产生的电场中,任何关于O点对称的两点场强大小________、方向________;关于连线对称的两点场强大小________、方向________;关于两电荷连线的中垂线对称的两点场强大小________、方向________。

(多选)(2023·黑龙江省铁人中学高一期中)电场线能很直观、方便地比较电场中各点电场强度的强弱。如图甲是等量异种点电荷形成电场的电场线,图乙是场中的一些点,O是电荷连线的中点,EF是连线中垂线上相对O对称的两点,BCAD也相对O对称。则(  )

A.BC两点电场强度大小和方向都相同

B.AD两点电场强度大小相等,方向相反

C.EOF三点比较,O点电场强度最强

D.BOC三点比较,O点电场强度最弱

(多选)(2024·汕尾市高二月考)如图所示,在等量负点电荷连线的中垂线上取ABCD四点,BD关于O点对称,ABCD四点的电场强度EAEBECED大小关系正确的是(  )

A.一定有EA>EB,EBED

B.一定有EA>EB,EB<ED

C.可能有EA<EB<EC

D.可能有EAEC<EB

针对训练(2023·东莞市高二联考)两个带等量正电的点电荷,固定在图中AB两点,O是它们连线的中点,NP是中垂线上的两点,ONOP。一带负电的试探电荷,从P点由静止释放,只在静电力作用下运动,则试探电荷(  )

A.运动到O点时的速度最大

B.经过关于O对称的两点时加速度相同

C.沿着PON,试探电荷的加速度一定先减小后增加

D.若试探电荷的电量增大,试探电荷在P点所受电场力与其电量的比值增大

通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1JYC12PUPGPNazMlYWE5hgQ?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.001047s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001432s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000609s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002001s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001414s ]
  6. SELECT * FROM `set` [ RunTime:0.001145s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001629s ]
  8. SELECT * FROM `article` WHERE `id` = 477710 LIMIT 1 [ RunTime:0.002588s ]
  9. UPDATE `article` SET `lasttime` = 1774741280 WHERE `id` = 477710 [ RunTime:0.003699s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000694s ]
  11. SELECT * FROM `article` WHERE `id` < 477710 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001968s ]
  12. SELECT * FROM `article` WHERE `id` > 477710 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000863s ]
  13. SELECT * FROM `article` WHERE `id` < 477710 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007943s ]
  14. SELECT * FROM `article` WHERE `id` < 477710 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004116s ]
  15. SELECT * FROM `article` WHERE `id` < 477710 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004535s ]
0.209993s