山西省忻州市第一中学高中物理4.2探究电磁感应的产生条件预习案(无答案)新人教版选修3_2.doc

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1探究电磁感应的产生条件【教学目标】1经历感应电流产生条件的探究活动,能结合实验对磁通量的变化进行定性和定量的判断。能根据实验事实分析、归纳、总结产生感应电流的条件。2会运用产生感应电流的条件判断具体实例中有无感应电流。 3通过现象,分析、归纳事物本质特征的思想方法。认识到实验观察能力与逻辑思维能力在科学探究过程中的重要作用。感悟物理学的高度概括性以及以最简洁的方式反映不深刻的本质的这一特点。4本节为后面楞次定律、法拉第电磁感应定律、变压器等知识的学习奠定基础。【预习任务】1复习并回答以下问题:(1)磁通量的定义式是:(2)引起磁通量变化的途经有:2阅读教材 P5“实验观察”内容,判断课本图(4. 2-1)和(4.2-2)实验中哪些情况产生感应电流?3阅读教材 P6“分析论证”内容,总结各实验产生感应电流的条件,能否归结为磁通量的变化?【思考与讨论】1在教材 P7做一做“摇绳能发电吗?”中,你觉得摇绳的两位同学应该站在东西方向,还是南北方向?为什么?【自主检测】1闭合电路的一部分导线 ab 处于匀强磁场中,下图中各情况下导线都在纸面内运动,各图中能产生感应电流的是【 】A B C D22教材 P7“问题与练习”第 1 题。3教材 P8“问题与练习”第 2 题。4教材 P8“问题与练习”第 3 题。【组内检查】 1感应电流产生的条件 2磁通量变化的各种类型3

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