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1、名师精编优秀教案3.4 磁场对通电导线的作用力一、教材分析安培力的方向和大小是重点，弄清安培力、电流、磁感应强度三者方向的空间关系是难点。安培力的方向一定与电流、磁感应强度方向垂直，但电流方向与磁感应强度的方向可以成任意角度；当电流方向与磁感应强度的方向垂直时，安培力最大。对此学生常常混淆二、教学目标（一）知识与技能1、知道什么是安培力，会推导安培力公式F=BILsin。2、知道左手定则的内容，并会用它判断安培力的方向。3、了解磁电式电流表的工作原理。（二）过程与方法通过演示实验归纳、总结安培力的方向与电流、磁场方向的关系左手定则。（三）情感、态度与价值观1、通过推导一般情况下安培力的公式F=
2、BILsin，使学生形成认识事物规律要抓住一般性的科学方法。2、通过了解磁电式电流表的工作原理，感受物理知识的相互联系。三、教学重点难点教学重点安培力的大小计算和方向的判定。教学难点用左手定则判定安培力的方向。四、学情分析安培力的方向一定与电流、磁感应强度方向垂直，但电流方向与磁感应强度的方向可以成任意角度；当电流方向与磁感应强度的方向垂直时，安培力最大。对此学生常常混淆五、教学方法实验观察法、逻辑推理法、讲解法六、课前准备1、学生的准备：认真预习课本及学案内容2、教师的准备：多媒体课件制作，课前预习学案，课内探究学案，课后延伸拓展学案演示实验：蹄形磁铁多个、导线和开关、电源、铁架台、两条平行
3、通电直导线七、课时安排：1 课时八、教学过程（一）预习检查、总结疑惑名师精编优秀教案（二）情景引入、展示目标通过第二节的学习，我们已经初步了解磁场对通电导线的作用力。安培在这方面的研究做出了杰出的贡献，为了纪念他，人们把通电导线在磁场中所受的作用力叫做安培力。这节课我们对安培力作进一步的讨论。（三）合作探究、精讲点播1、安培力的方向教师：安培力的方向与什么因素有关呢？演示：如图所示，连接好电路。演示实验：（1）改变电流的方向现象：导体向相反的方向运动。（2）调换磁铁两极的位置来改变磁场方向现象：导体又向相反的方向运动。教师引导学生分析得出结论（1）安培力的方向和磁场方向、电流方向有关系。（2）
4、安培力的方向既跟磁场方向垂直，又跟电流方向垂直，也就是说，安培力的方向总是垂直于磁感线和通电导线所在的平面。左手定则通电直导线所受安培力的方向和磁场方向、电流方向之间的关系，可以用左手定则来判定：伸开左手，使大拇指跟其余四个手指垂直，并且都和手掌在一个平面内，把手放入磁场中，让磁感线垂直穿入手心，并使伸开的四指指向电流的方向，那么，大拇指所指的方向就是通电导线在磁场中所受安培力的方向。例：判断下图中导线A所受磁场力的方向。通电平行直导线间的作用力方向如何呢？演示实验：（1）电流的方向相同时现象：两平行导线相互靠近。（2）电流的方向相反时现象：两平行导线相互远离。引导学生利用已有的知识进行分析如
5、图，两根靠近的平行直导线通入方向相同的电流时，它们相互间的作用力的方向如何?文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8
6、M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7
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11、A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7名师精编优秀教案说明：分析通电导线在磁场中的受力时，要先确定导线所在处的磁场方向，然后根据左
12、手定则确定通电导线的受力方向。例题 2:下列四幅图中通电导体受力方向表示正确的是()2、安培力的大小通 过 第 二 节课的学习，我们已经知道，垂直于磁场B放置的通电导线L，所通电流为I时，它在磁场中受到的安培力F=BIL当磁感应强度B的方向与导线平行时，导线受力为零。问题：当磁感应强度B的方向与导线方向成夹角时，导线受的安培力多大呢？例题 1画出图中第三者的方向文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H
13、10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9
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17、 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4
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19、 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7名师精编优秀教案教师投影图3.4-4，引导学生推导：将磁感应强度B分解为与导线垂直的分量B和与导线平行的分量/B，则，sinBBcos/BB因/B不产生安培力，导线所受安培力是B产生的，故安培力计算的一般公式为：sinILBF3、磁电式电流表中学实验室里使用的电流表是磁电式电流表，下面我们来学习磁电式电流表的工作原理。（1）电流表主要由哪几部分组成的？投影图 3.4-5。电流表由永久磁铁、铁芯、线圈、
20、螺旋弹簧、指针、刻度盘等六部分组成。（2）什么电流表可测出电流的强弱和方向？磁场对电流的作用力和电流成正比，因而线圈中的电流越大，安培力越大，线圈和指针偏转的角度就越大，因此，根据指针偏转角度的大小，可以知道被测电流的强弱。当线圈中的电流方向改变时，安培力的方向随着改变，指针的偏转方向也随着改变，所以，根据指针的偏转方向，可以知道被测电流的方向。（3）电流表中磁场分布有何特点呢？为何要如此分布？电流表中磁铁与铁芯之间是均匀辐向分布的。如图。所谓均匀辐向分布，就是说所有磁感线的延长线都通过铁芯的中心，不管线圈处于什么位置，线圈平面与磁感线之间的夹角都是零度。该磁场并非匀强磁场，但在以铁芯为中心的
21、圆圈上，各点的磁感应强度B的大小是相等的。这样的磁场，可使线圈转动时，它的两个边所经过的位置磁场强弱都相同，从而使表盘的刻度均匀。（4）磁电式仪表的优缺点是什么？磁电式仪表的优点是灵敏度高，可以测出很弱的电流；缺点是绕制线圈的导线很细，文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7
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24、V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY1
25、0H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3
26、I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档
27、编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9
28、B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7名师精编优秀教案允许通过的电流很弱（几十微安到几毫安）。如果通过的电流超过允许值，很容易把它烧坏。（四）反思总结、当堂检测（五）发导学案、布置作业课堂训练作业1、课下阅读课本第98 页，做一做用小磁针估测磁感应强度或旋转的液体小实验。2、完成 P99“问题与练习”第1、2、4 题。书面完成第3 题。九、板书设计1、安培力的方向左手定则2、安培力的的大小：sinILBF3、磁电式电流表十、教学反思空间想象能力对本节学习至关重要、要使学生能够看懂立体图，熟悉各种角度的侧视图、俯视图和剖面图，需要一定的巩固训练。文档编码:CN9B8
29、M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7
30、 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4
31、X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5
32、 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H
33、10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9
34、A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7文档编码:CN9B8M9T7R7 HV9Q4X3G7V5 ZY10H10I3I9A7