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
2014-04-23
30
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.
Henry connected the wire to______.
选项
A、a coil
B、a galvanometer
C、the poles of electromagnet
D、an iron bar
答案
B
解析
本题是一道具体细节题。问亨利把电线连接到了什么上面。利用查阅式阅读法,我们可以在第三段中找到相关信息。这部分指出,这一实验促使亨利着手搞起了磁、电转换实验。他先将一些绝缘导线绕在一根铁条上,并将导线的两端与一个电流计连接起来。因此,本题的正确答案应是B“与电流计连接在一起”。
转载请注明原文地址:https://jikaoti.com/ti/XrIYFFFM
0
在职攻硕英语联考
相关试题推荐
Theyearsbetween1870and1895broughtenormouschangestothetheaterintheUnitedStatesastheresidentcompanywasundermi
ThecrucialyearsoftheDepression,astheyarebroughtintohistoricalfocus,increasinglyemergeasthedecisivedecadeforA
Thereceptionwasattendedbyvarious______membersofthelocalcommunityandrepresentativesofregionalindustries.
Stopaskingallthesepersonalquestions!Itisbadmannerstobe______.
Don’tcallhimjustacollegeprofessor.Internetentrepreneur,TVpersonality,advisortopresidents,andfriendtotherichan
RichardSatava,programmanagerforadvancedmedicaltechnologies,hasbeenadrivingforcebringingvirtualrealitytomedicine
WhatdidElizabethPeabodydowhenshefoundedthefirstkindergartenintheUnitedStates?
Thisbookderivesfromdecadesofteachinginvariousschoolsacrossthecountry.Itisbasedonthebeliefthatphilosophyisa
Cosmicraysofvariouskindscomethroughtheairfromouterspace,butenormousquantitiesofradiationfromthesunare______
Healthycommunicationisessentialfor______throughdifficultiesforamarriedcouple.
随机试题
A.营养强化剂 B.防腐剂 C.发色剂 D.漂白剂 E.抗氧化剂食品添加剂亚硝酸钠归类为()。
在水中溶解度最小的溶剂是
检查母畜乳房时,出现乳腺淋巴结肿大,硬结,触诊无热痛,则提示()。
人体实验伦理审查依据的最早国际文件是
海控二级点相对于相邻起算点的点位中误差为()。
获得劳务分包资质的企业,可以承接施工总承包企业或者专业承包企业分包的劳务作业。劳务分包企业不包括()。
普通开放式基金份额属于()
某红酒生产企业,经过分析后,决定采用产品开发策略,针对本国现有的女性人群推出一种新型的红酒。为使产品打进市场,在对市场进行深入调查分析后,决定以白领女性顾客群体作为其目标市场。产品最初推向市场的时候,为使自己的产品获得稳定的销路,给消费者留下美好的印象,该
ElectromagneticEnergy1.Whitelightseemstobeacombinationofallcolors.Theenergythatcomesfromasourceoflight
A、Sellingdirecttothepublic.B、Sellingthroughtheirownchains.C、Sellingbyonlinestores.D、Sellingthroughsmallshops.C
最新回复
(
0
)