Why did Sturgeon's electromagnet could support nine pounds of iron?A. Because the iron rod was bent into the shape of a “horseshoe”.B. Because the rod was coated with varnish.C. Because a layer of copper wire was wrapped around the rod.D. Because the rod
题目
Why did Sturgeon's electromagnet could support nine pounds of iron?
A. Because the iron rod was bent into the shape of a “horseshoe”.
B. Because the rod was coated with varnish.
C. Because a layer of copper wire was wrapped around the rod.
D. Because the rod was made magnetic by the passing current.
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参考答案和解析
正确答案：D
[解析] 答案见文章第3第4句。电流通过金属丝，使得金属棒带有磁性，由于磁性的吸引，金属棒可以承受9磅的铁。
[解析] 答案见文章第3第4句。电流通过金属丝，使得金属棒带有磁性，由于磁性的吸引，金属棒可以承受9磅的铁。
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