单选题 较易0.85 引用4 组卷147
如图所示,在条形磁铁的一端吸引着两个大头针的针尖部,则这两个大头针的针帽将
![](https://img.xkw.com/dksih/QBM/2018/8/22/2015746808332288/2033651674013696/STEM/35fc70e2-4adb-409d-80a9-d1ed106f6b18.png)
![](https://img.xkw.com/dksih/QBM/2018/8/22/2015746808332288/2033651674013696/STEM/35fc70e2-4adb-409d-80a9-d1ed106f6b18.png)
A.互相排斥 | B.互相吸引 |
C.既不排斥也不吸引 | D.无法确定 |
17-18九年级·全国·单元测试
类题推荐
如图所示,甲、乙、丙、丁是四幅实验图。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/5f491060-1e93-46f8-aacc-25a95de82714.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/1c3b9af7-db58-44a1-a920-bddf92345e96.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/5c4d8c42-45b5-4703-9191-7ae896e85ead.png?resizew=157)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/fe253d68-21b1-4ccd-8ce8-21304b4d9d62.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/5f491060-1e93-46f8-aacc-25a95de82714.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/1c3b9af7-db58-44a1-a920-bddf92345e96.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/5c4d8c42-45b5-4703-9191-7ae896e85ead.png?resizew=157)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2709047728463872/2709128474320896/STEM/fe253d68-21b1-4ccd-8ce8-21304b4d9d62.png?resizew=145)
A.实验甲说明通电导线周围存在磁场,即电磁感应现象 |
B.实验乙说明导体在磁场中运动时,导体中就会产生电流,即电流的磁效应 |
C.实验丙说明磁场对通电导线有力的作用,即电动机的工作原理 |
D.实验丁说明磁极间有相互作用,即同名磁极相互吸引,异名磁极相互排斥 |
小明用水平放置的一根条形磁铁的一端吸起一根较重的铁钉,如图所示,若他用一根同样的条形磁铁的N极与原来的磁铁S极靠近合并时,下列说法正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/370e9a91-27ec-41b9-87de-38c3d31ce8fb.png?resizew=161)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/370e9a91-27ec-41b9-87de-38c3d31ce8fb.png?resizew=161)
A.铁钉的尖端被吸向右端磁铁 |
B.铁钉的尖端被吸向左端磁铁 |
C.铁钉将落下 |
D.铁钉被吸得更牢 |
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