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扬声器和耳机的构造和原理

> 关于电和磁的说法中错误的是 A.发电机是利用电磁感应原理制成的 B.磁感线都是从磁体的N极出发，回到S极 C.通电导体在磁场中受力的方向与电流方向有关 D.所有的金属材料在磁体或电流的作用下都会获得永久磁性

问题：

发布时间：2024-09-10

关于电和磁的说法中错误的是

A.发电机是利用电磁感应原理制成的
B.磁感线都是从磁体的N极出发，回到S极
C.通电导体在磁场中受力的方向与电流方向有关
D.所有的金属材料在磁体或电流的作用下都会获得永久磁性

参考答案：

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