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Why did Sturgeon's electromagnet could support nine pounds of iron?A. Because the iron rod

Why did Sturgeon's electromagnet could support nine pounds of iron?A. Because the iron rod

WhydidSturgeon'selectr omagnetcouldsupportninepoundsofiron?

A.Becausetheironrodwasbentintotheshapeofa“horseshoe”.

B.Becausetherodwascoatedwithvarnish.

C.Becausealayerofcopperwirewaswrappedaroundtherod.

D.Becausetherodwasmademagneticbythepassingcurrent.

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。
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