当前位置:首页>学习笔记>【26版步步高物理人教版必修三学习笔记第十章专题强化静电场中的功能关系及图像问题

【26版步步高物理人教版必修三学习笔记第十章专题强化静电场中的功能关系及图像问题

  • 2026-02-15 18:06:12
【26版步步高物理人教版必修三学习笔记第十章专题强化静电场中的功能关系及图像问题

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专题强化 静电场中的功能关系及图像问题

[学习目标] 1.能应用动能定理、机械能守恒定律等分析静电场中的功能关系。2.理解φxExEpx等图像的意义并会应用图像解决电场问题。 

一、静电场中的功能关系

1.静电力做功的计算

2.电场中常见的几种功能关系

(1)静电力做功等于带电体电势能的减少量,即WABEpAEpB=-ΔEp

(2)合外力做功等于带电体动能的变化量,即W=ΔEk,这里的W指合外力做的功。

(3)静电力做正功,带电体的机械能增加,静电力做负功,带电体的机械能减少。若只有静电力做功,则动能和电势能之间相互转化,二者总和不变,即ΔEk=-ΔEp

 (多选)如图所示,在水平向右的匀强电场中有一绝缘斜面,斜面上有一带电金属块沿斜面滑下。已知在金属块滑下的过程中动能增加了12 J,金属块克服摩擦力做功8 J,重力做功24 J,则以下判断正确的是(  )

A.金属块带正电荷

B.金属块的机械能减少12 J

C.金属块克服静电力做功8 J

D.金属块的电势能减少4 J

(多选)图中虚线abcdf代表匀强电场内间距相等的一组等势面,已知平面b上的电势为2 V。一电子经过a时的动能为10 eV,从ad的过程中克服静电力所做的功为6 eV。下列说法正确的是(  )

A.平面c上的电势为零

B.该电子可能到达不了平面f

C.该电子经过平面d时,其电势能为4 eV

D.该电子经过平面b时的速率是经过d时的2倍

二、电场中的图像问题

1.φx图像

(1)φx图像的意义:反映了电势φ随位置x变化的规律。在φx图像中根据纵坐标值可以直接判断各点电势的高低。

(2)φx图线的斜率绝对值表示沿x轴方向电场强度的大小;电场强度为零处,其切线的斜率为零。

(3)设电场强度的方向与x轴平行,图像中沿x轴,电势降低的方向即为电场强度方向。图中A点电势高于B点电势,故AB间电场方向沿x轴正方向,C点电势低于D点电势,故CD间电场方向沿x轴负方向。

(多选)在某个电场中,x轴上各点电势φx坐标变化的关系如图所示,图像关于φ轴左右对称,一质量为m、电荷量为+q的粒子只在静电力作用下能沿x轴做直线运动。下列说法正确的是(  )

A.x轴上xx1x=-x1两点电场强度和电势都相同 

B.粒子运动过程中,经过xx1x=-x1两点时速度一定相同

C.粒子运动过程中,经过x=-x1点的加速度大小等于经过xx1点的加速度大小

D.若粒子在x=-x1点由静止释放,则粒子到达O点时加速度为零,速度达到最大

针对训练 如图甲所示,直线AB是电场中的一条电场线,沿与直线AB成 θ=37°的方向建立一维坐标轴Ox,令原点O处电势为零,则沿Ox坐标轴上各点的电势φx坐标的关系如图乙所示,直线上P点坐标已标注在图中。下列说法正确的是(cos 37°=0.8)(  )

A.电场方向由B 指向A

B.电场方向沿x 轴正方向

C.原点O处的电场强度大小为2×102 V/m

D.原点O处的电场强度大小为1.6×102 V/m

2.Ex图像

(1)Ex图像的意义:反映了沿x轴方向电场强度Ex变化的规律。

(2)设x轴正方向为电场强度的正方向,E>0表示电场强度沿x轴正方向;E<0表示电场强度沿x轴负方向。

(3)图线与x轴围成的面积表示电势差,面积大小表示电势差大小,两点的电势高低根据电场方向判定。

(2023·广东省执信中学高二月考)某半导体PN结中存在电场,取电场强度E的方向为x轴正方向,其Ex关系如图所示,ONOP,OAOB。取O点的电势为零,则(  )

A.AB的电势相等

B.从NO的过程中,电势一直升高

C.电子从N移到P的过程中,电势能先增大后减小

D.电子从N移到O和从O移到P的过程中,静电力做功相等

3.Epx图像

(1)Epx图像的物理意义:反映了电势能Epx变化的规律。

(2)图像切线的斜率绝对值表示静电力大小。图像切线斜率为零时静电力为零,该点的电场强度的大小也为零。

(多选)(2023·北京市首都师范大学附属中学高二期中)如图甲所示,在某电场中建立x坐标轴,O为坐标原点,A点坐标为x1,一电子仅在静电力作用下沿x轴运动,其电势能Ep随其坐标x变化的关系如图乙所示。下列说法正确的是(  )

A.过O点的电场线一定与x轴重合

B.A点电场强度的方向沿x轴负方向

C.该电子在A点受到的静电力大于其在O点受到的静电力

D.该电子在O点的动能大于其在A点的动能

通过网盘分享的文件:同步PPT课件等3个文件

链接: https://pan.baidu.com/s/1_GzpLu1fXgm2Lbs2dUxo2A?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:0.000336s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000509s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000402s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000595s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000609s ]
  8. SELECT * FROM `article` WHERE `id` = 468629 LIMIT 1 [ RunTime:0.000705s ]
  9. UPDATE `article` SET `lasttime` = 1771207090 WHERE `id` = 468629 [ RunTime:0.012106s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000336s ]
  11. SELECT * FROM `article` WHERE `id` < 468629 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000477s ]
  12. SELECT * FROM `article` WHERE `id` > 468629 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003900s ]
  13. SELECT * FROM `article` WHERE `id` < 468629 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006223s ]
  14. SELECT * FROM `article` WHERE `id` < 468629 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012025s ]
  15. SELECT * FROM `article` WHERE `id` < 468629 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006361s ]
0.114511s