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
81
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://kaotiyun.com/show/BbWO777K
0
在职攻硕英语联考
相关试题推荐
In1987,H.I.V/AIDSjoinedalistofdiseasesthatcouldkeepapersonoutofthelinkedStates.Thegovernmentlatertriedto
Withinhoursofappearingontelevisiontoannouncetheendofconscription,PresidentJacquesChiracmovedquicklytopreventa
Withinhoursofappearingontelevisiontoannouncetheendofconscription,PresidentJacquesChiracmovedquicklytopreventa
RichardSatava,programmanagerforadvancedmedicaltechnologies,hasbeenadrivingforcebringingvirtualrealitytomedicine
TheUnitedNationsWorldFoodProgramsays______couldpushonehundredmillionpeopleintohunger.
Humorisamosteffective,yetfrequentlyneglected,meansofhandlingthedifficultsituationsinourlives.Itcanbeusedfor
Thefirstdevicemenhadformeasuringtimewasthesundial,whichwasinventedaround700B.C.Theearlysundialwasahollowh
Woman:Whatdoyouliketodoonyoursummervacation?Man:Ilikenothingbetterthanfishingonahotsummerday.Question:What
ShewenttoEuropeonvacation’butherhappytimeendedin______whentheirhotelcaughtfire.
随机试题
患儿2岁,发热4天,伴咳嗽、流涕,眼结合膜充血、流泪,半天前发现患儿耳后、颈部、发际边缘有稀疏不规则红色斑丘疹,疹间皮肤正常,测体温40℃,心肺正常。疹退后可能的皮肤改变
管理方格理论中,任务管理指()
生产力和生产关系、经济基础和上层建筑之间的矛盾是社会发展的基本动力。这是因为这两对矛盾
简述教师的作用。
A.近曲小管B.髓袢降支细段C.髓袢升支粗段D.远曲小管E.集合管肾小球滤液中的氨基酸被重吸收的部位是()
港天公司对港红公司、港黄公司均持有50%的股份,但从未参与或影响两家公司的任何生产经营事务。2016年之前,在某港口西部港区只有港红、港黄公司开展理货业务,两家公司多次沟通并将理货价格推高至每标准箱12元的水平。2016年新的理货公司进入西部港区后,两家公
[2010年第78题]液体的压力P、速度v、密度ρ无量纲数组合是()。
下列关于申报地点的表述,错误的是()。
为了加强海事文化建设,单位要做一个海事文化专刊。由你负责编辑发行。一位老同事投了一篇非常好的有关海事业务的专业性文章,但是与本次的文化主题不符。没有被采用。老同志很不高兴,你如何与他沟通?请现场模拟。
郭某原是某软件公司的网络规划设计师,一直从事计算机网络端口优化处理的研发工作。2007年5月郭某退休。半年后,郭某研发出网络端口优化处理程序,解决了提高计算机网络端口有效利用率这个技术问题,并以个人名义向专利局提出发明专利申请。该项发明创造应属于(64)所
最新回复
(
0
)