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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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更多 “ 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. ” 相关考题
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