题目内容

物理知识广泛应用于生产和生活实际中,下图所示的器具应用到电磁感应现象的是
D

试题分析:A.电话听筒的作用是利用电磁铁将强弱变化的电流转变为强弱变化的振动,从而产生声音,利用的是电磁铁原理,A选项不符合题意;
B.电磁起重机的工作原理是电磁铁原理,B选项不符合题意;
C.动圈式扬声器是根据通电导体在磁场中受到力的作用的原理制成的,C选项也不符合题意;
D.变压器是利用互感现象制成的,而互感现象是电磁感应现象.故D选项符合题意;
本题答案选D.
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