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【2026版高中物理粤教版必修三册学习笔记练透word培优讲义课前预习答案精析

  • 2026-03-24 05:12:36
【2026版高中物理粤教版必修三册学习笔记练透word培优讲义课前预习答案精析

第一章 静电场的描述

第一节 静电现象

一、

情境1属于摩擦起电,塑料条带同种电荷互相排斥,散成一朵塑料花。

情境2属于接触起电,头发带同种电荷互相排斥,变成爆炸头

情境3属于感应起电,气球使易拉罐近气球端感应出异种电荷,易拉罐与气球互相吸引并靠近。

梳理与总结

1.吸引 2.正 负 3.摩擦 4.传导 5.(1)异种 同种 (2)重新分布

二、

1.(1)多少 (2)库仑

2.相等 密立根 整数倍

3.绝对值 1.60×10-19 C

4.质量me

三、

步骤实验现象:金属箔片张开,说明板带电。产生原因:金属球与箔片组成的整体发生静电感应现象。

步骤实验现象:金属箔片不张开,说明两板带等量异种电荷,净电荷量为零。

梳理与总结

1.(1)正电 负电 电中性 (2)得失电子 正电 负电

2.(1)创造 消灭 转移 转移 总量 (2)代数和

3.摩擦 接触 靠近 等量异种 相同电性 等量异种 异 同 转移 转移

第二节 库仑定律

一、

小得多 忽略 带电的点

讨论与交流

1.不能,一个带电体能否看作点电荷要视具体情况而定,不能只看体积大小或所带电量的大小。点电荷是一种理想模型,现实中不存在点电荷。

2.带电体本身的大小远小于带电体之间的距离。

二、

(1)对小球受力分析知,静电力Fmgtan θ,偏角减小,静电力F减小。

(2)静电力F增大。

(3)电荷之间作用力的大小与电荷量和电荷间的距离有关,且静电力随着电荷量的增加而增大,随着距离的增大而减小。

梳理与总结

(1)二次方 乘积 微小量放大法 控制变量法 (2)正比

二次方 它们的连线上 静电力

库仑力 kq1q2r2 9.0×109

在真空中 静止点电荷

讨论与交流

1.不能,当r0时电荷不能看成点电荷了。

2.两个规则的带电球体相距比较近时,不能看作点电荷,此时必须考虑电荷在球体上的实际分布。若带同种电荷时,如图(a),由于同种电荷排斥,电荷分布于最远的两侧,电荷中心距离大于3r,此时F<kq29r2;若带异种电荷时,如图(b),由于异种电荷吸引,电荷分布于最近的两侧,电荷中心距离小于3r,此时F>kq29r2

三、

以C为研究对象,根据库仑定律,点电荷C共受到F1F2两个静电力的作用,如图所示,每两个点电荷之间的距离都相同,故F1F2kQ2a2,根据平行四边形定则,合力为F=2F1cos 30°=3kQ2a2,合力的方向沿A与B连线的垂直平分线斜向右下方。

梳理与总结

1.远小于 2.无关 3.矢量和 4.点电荷 库仑定律

第三节 电场 电场强度

第1课时 电场强度 电场强度的叠加

一、

梳理与总结

1.(1)电场 (2)电荷 (3)电场

(4)静止

2.(1)电场 小 小 (2)电场力F 电量q牛顿每库仑 N/C

矢 相同 相反 (3)相同

二、

(1)与qP点所受静电力F方向相同

(2)qP点所受静电力大小为FkQqr2

(3)点电荷QP点产生的电场强度为EFqkQr2,方向沿AP的连线由A指向P

梳理与总结

1.(1)kQr2 (2)点电荷

2.向外 向内

三、

(1)AO点的场强EAkQr2=4kQr2,方向由A指向B

BO点的场强EBkQr2=4kQr2,方向由A指向B

(2)规定向右为正方向,E0EAEB=8kQr2,方向由A指向B

(3)对于互成角度的电场强度的叠加,合成时遵循平行四边形定则。

如图所示,设点电荷ABC点产生电场的场强分别为EAEB,则EAEBkQ\r(22=2kQr2,由平行四边形定则知C点的场强方向水平向右,大小为EC2EA2)kQr2

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:0.000581s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000779s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000399s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000519s ]
  6. SELECT * FROM `set` [ RunTime:0.000241s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000667s ]
  8. SELECT * FROM `article` WHERE `id` = 476696 LIMIT 1 [ RunTime:0.000414s ]
  9. UPDATE `article` SET `lasttime` = 1774353455 WHERE `id` = 476696 [ RunTime:0.032066s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009467s ]
  11. SELECT * FROM `article` WHERE `id` < 476696 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002746s ]
  12. SELECT * FROM `article` WHERE `id` > 476696 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000426s ]
  13. SELECT * FROM `article` WHERE `id` < 476696 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001442s ]
  14. SELECT * FROM `article` WHERE `id` < 476696 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000779s ]
  15. SELECT * FROM `article` WHERE `id` < 476696 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015871s ]
0.135470s