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.
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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