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培优讲义第六章第一节磁现象与磁场

【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第六章第一节磁现象与磁场

  • 2026-03-31 03:42:17
【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第六章第一节磁现象与磁场

第一节 磁现象与磁场

[学习目标] 1.知道磁场的概念,知道磁体与磁体间、磁体与电流间、电流与电流间的作用是通过磁场发生的。2.理解磁感线的概念,知道磁感线的特点(重点)。3.理解安培定则,会用安培定则判断电流的磁场方向(重难点)。4.了解安培分子电流假说,知道地磁场的特点。

一、磁现象、磁场

如图甲所示,通电导线放在蹄形磁铁附近,悬挂导线的细线偏离竖直方向,说明通电导线受到力的作用;如图乙所示,两条通电导线之间也有作用力。

根据实验,在图丙空白方框内填入恰当的内容。

1.磁作用的主要表现

(1)磁体与磁体间:两个同名磁极相互________,异名磁极相互________。

(2)磁体与通电导体间:电流________效应实验(电流可以产生磁场)、电动机的基本原理。

2.磁场:磁体与磁体之间、磁体与电流之间、电流与电流之间的相互作用,都是通过________发生的,磁场是客观存在的________,磁体和电流周围都存在磁场,磁场对置于其中的其他磁体或电流施加________。

(1)磁场是为了解释磁极间相互作用而人为规定的。(  )

(2)电流与电流之间可以通过磁场发生作用。(  )

(3)磁场只有在磁体与磁体、磁体与电流发生作用时才产生。(  )

(4)磁体的磁场和电流的磁场本质上是一样的。(  )

例1

A.磁体周围的磁场看不见、摸不着,所以磁场不是客观存在的

B.将小磁针放在磁体附近,小磁针会发生偏转是因为受到磁场力的作用

C.把磁体放在真空中,磁场就消失了

D.当磁体周围撒上铁屑时才能形成磁场,不撒铁屑磁场就消失

二、磁感线

1.磁感线:在磁场中画出一些有方向的曲线,在这些曲线上,每一点的________都与该点的磁场方向一致。

2.磁感线的特点

(1)磁场越强的地方,磁感线越________。

(2)在磁体或通电螺线管的外部,磁感线从________(N极)出发回到________(S极),在内部的磁感线由________指向________,形成闭合的曲线。

3.电流周围的磁场

(1)直线电流的磁场

安培定则:如图甲所示,用________握住导线,让伸直的拇指所指的方向与电流方向一致,________所指的方向就是磁感线环绕的方向。

(2)环形电流的磁场

安培定则:如图丙所示,让右手________与环形电流的方向一致,________就是环形导线轴线上磁场的方向。

(3)通电螺线管的磁场

安培定则:如图丁所示,用右手握住螺线管,让弯曲的四指与________一致,伸直的拇指所指的方向就是________磁场的方向或者说拇指所指的方向是它的________的方向。

1.比较磁感线和电场线,完成下列表格。

比较项目

磁感线

电场线

相似点

意义

为了形象地描述磁场方向和相对强弱而假想的线,实际不存在

为了形象地描述电场方向和相对强弱而假想的线,实际不存在

方向

线上各点的________即该点的磁场方向

线上各点的________即该点的电场方向

疏密

表示________

表示________

特点

在空间不相交、不中断、也不相切

在空间不相交、不中断

不同点

是________曲线

磁体外部:________磁体内部:________

是________的曲线,始于正电荷或无穷远处,止于无穷远或负电荷处

2.直线电流的磁感线是以导线上任意点为圆心的多组同心圆,越向外越稀疏,磁场越弱,试画出图乙(直线电流的磁感线分布)的横截面图(从上向下看)及纵截面图(从正面看)。(“×”表示垂直纸面向里,·表示垂直纸面向外)

3.安培定则判断的是环形电流中心轴线上磁感线方向与电流方向之间的关系,试画出丙(环形电流的磁场)图环形电流的立体图、横截面图(从右向左看)及纵截面图(从正面看)。(“×”表示垂直纸面向里,·表示垂直纸面向外)

4.通电螺线管内部磁场(通电螺线管两侧边缘除外)为匀强磁场且比外部强,方向由S极指向

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:0.000364s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000694s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001440s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000313s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.001941s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000572s ]
  8. SELECT * FROM `article` WHERE `id` = 478574 LIMIT 1 [ RunTime:0.013484s ]
  9. UPDATE `article` SET `lasttime` = 1774976672 WHERE `id` = 478574 [ RunTime:0.002687s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000885s ]
  11. SELECT * FROM `article` WHERE `id` < 478574 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006426s ]
  12. SELECT * FROM `article` WHERE `id` > 478574 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000435s ]
  13. SELECT * FROM `article` WHERE `id` < 478574 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005265s ]
  14. SELECT * FROM `article` WHERE `id` < 478574 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001418s ]
  15. SELECT * FROM `article` WHERE `id` < 478574 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000858s ]
0.109788s