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
83
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://kaotiyun.com/show/a9XO777K
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
TheclashbetweenRealMadridandArsenalisbeing______asthematchoftheseason.
Wemadeplansforavisit,but______difficultieswithcarpreventedit.
Bartendersarerarelyshyaboutofferinganopinion.ButonarecenteveningattheFinboroughWineCafe,inbetweenpoursofBe
Vacationpoliciescontinuetobeasourceof______betweenmanagementandtheworkers.
Untilmeninventedwaysofstayingunderwaterformorethanafewminutes,thewondersoftheworldbelowthesurfaceofthesea
Wemadeplansforavisit,but______difficultieswithcarpreventedit.
Wemadeplansforavisit,but______difficultieswithcarpreventedit.
Thefirstdevicemenhadformeasuringtimewasthesundial,whichwasinventedaround700B.C.Theearlysundialwasahollowh
随机试题
模拟试验报告与正式报告的区别就是缺少盖章,试验检测程序完全一样。()
Formostpeople,lifeiseasierandmorecomfortablethaneverbefore.Conveniencefoodsfromthesupermarketsimplifyshopping
某患者因急性肾衰竭入院,医生为其采血化验做离子检查。以下对检验结果影响最大的是
总分类账户和明细分类账户平行登记的要点包括()。
分析下面的谱例。要求:画出结构图示,并标出各部分的小节数。
某网友在微博上发起了“随身拍解救乞讨儿童”的活动。信息被关注和转发,产生了一系列连锁反应,社会公众参加街拍,慈善基金参加募捐,警察调查核实,“关注产生力量,围观改变中国”。由此可见()。①文化的深度和广度影响文化的力量②文化的力量深深植根于信息
反映孔子教育民主思想的主要言论是()。
Usingtheinformationinthetext,completeeachsentence14-18,withawordorphrasefromthelistbelow.Foreachsentenc
WhatdoWeknowabouttheWeather?
Womenareonthevergeofoutnumberingmenintheworkforceforthefirsttime,ahistoricreversalcausedbylong-termchanges
最新回复
(
0
)