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九年级物理全册第二十章电与磁章末小结与提升课件（新版）新人教版.pptx

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第二十章 电与磁,【解析】根据“当未消磁的标签通过超市门口的安全门时,安全门上的线圈会产生电流触发警报器”可知,其工作原理是电磁感应现象。题图A中没有电源,是发电机的原理图,是电磁感应现象,符合题意;题图B是奥斯特实验,说明通电导线周围有磁场,不符合题意;题图C中有电源,通电导体能运动,说明磁场对通电导体有力的作用,不符合题意;题图D是探究影响电磁铁磁性强弱因素的实验,是电流的磁效应,不符合题意。 【答案】 A,

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