首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The electromagnet was invented in England by William Sturgeon, who took an iron rod and bent it into the shape of a horseshoe. T
The electromagnet was invented in England by William Sturgeon, who took an iron rod and bent it into the shape of a horseshoe. T
admin
2012-07-17
50
问题
The electromagnet was invented in England by William Sturgeon, who took an iron rod and bent it into the shape of a horseshoe. This "horseshoe" was coated with varnish (清漆) and a layer of copper wire was wrapped around it. An electric current was passed through the wire, thus making the rod magnetic. The rod was now, because of magnetic attraction, able to support nine pound of iron.
In the US, a scientist named Joseph Henry improved on Sturgeon’s electromagnet by insulating (使绝缘) the copper wire with silk. He was able to wrap many turns of wire around an iron core without danger of circuits between the turns. His magnet could hold 2 300 pounds.
This experiment prompted Henry to try his hand at converting magnetism into electricity. First he coiled (缠绕, 盘绕) some insulated wire around an iron bar, connecting both ends of the wire to a galvanometer (电流计). The iron bar was placed across the poles of the electromagnet. Then the coil of the electromagnet was connected to a battery. The galvanometer indicated a voltage , then dropped to zero. Henry signaled his assistant to disconnect the coil. The galvanometer showed that once again a voltage had been produced, although this time in the opposite direction. The principle of electromagnet induction (感应现象) had thus been discovered. Unfortunately for Joseph Henry he did not publish findings and someone else (Faraday) got the credit for the discovery.
According to what appeared in print at that time______.
选项
A、Joseph Henry discovered the principle of electromagnetic induction
B、Henry falsely tried to claim credit for the discovery of the principle of electromagnetic induction
C、Faraday discovered the principle of electromagnetic induction
D、Henry’s experiment with electromagnetic induction was a failure
答案
C
解析
本题问按照当时发表的文字记载,是谁发现了电磁感应定律。根据文章内容我们知道,事实上是亨利发现了电磁感应定律。不幸的是,亨利没有公开发表他的成果,而被他人(法拉第)得到了这项发现的荣誉。因此,本题的正确答案应是c“按照当时的公开发表的文字记载是法拉第发现了电磁感应定律”。
转载请注明原文地址:https://jikaoti.com/ti/UHKYFFFM
0
在职攻硕英语联考
相关试题推荐
Theamazingsuccessofhumansasa【C1】______istheresultoftheevolutionarydevelopmentofourbrainswhichhasled,amongoth
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【C1】______Japanesecarstogether.Theseautow
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【C1】______Japanesecarstogether.Theseautow
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【C1】______Japanesecarstogether.Theseautow
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【C1】______Japanesecarstogether.Theseautow
ThehistoryofAfrican—Americansduringthepast400yearsistraditionallynarrated【C1】______anongoingstruggleagainst【C2】___
ThehistoryofAfrican—Americansduringthepast400yearsistraditionallynarrated【C1】______anongoingstruggleagainst【C2】___
Bartendersarerarelyshyaboutofferinganopinion.ButonarecenteveningattheFinboroughWineCafe,inbetweenpoursofBe
ALessnotedbutBequallysignificant,themenandwomenwhoformedfamiliesbetween1940and1960Calsoreducedthedivorcerate
Healthycommunicationisessentialfor______throughdifficultiesforamarriedcouple.
随机试题
物资的进出库及保管作业具有生产性质,但它不生产产品,不创造价值,是通过()劳动保持物资的原有价值。
【适应证】1.通气不足,如慢性阻塞性肺部疾病。2.通气血流比例失调。3.弥散功能障碍,如肺广泛纤维化、肺水肿等。4.右向左分流,如先天性心脏病、大面积肺不张。5.其他原因引起的缺氧,如心力衰竭、末梢循环衰竭
A.补心养血B.除烦安神C.益气养血D.舒肝养血E.滋补肝肾妇科常用成药更年安片除滋阴清热外,还能()。
公路工程质量评定以分项工程作为基本单元,实测项目按()评价是否合格。
A企业的乙材料是一个月前从本市购进的,材料明细账记载如下:××月5日,数量600件,单价220元,运费50元,评估时该库存材料尚有195件。则该库存材料的评估值为()元。
《中华人民共和国商业银行法》规定的商业银行经营原则包括()原则。
下列发明人或者设计人作出的发明创造,属于职务发明创造的是()。
下列关于数据库管理系统维护事务的ACID特性的叙述,正确的是()。
非居民个人劳务报酬所得属于同一事项连续取得收入的,以()取得的收入为一次计征个人所得税。
FollowingtheexplosionofcreativityinFlorenceduringthe14thcenturyknownastheRenaissance,themodernworldsawadepar
最新回复
(
0
)