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
自考
The electromagnet was invented in England by William Sturgeon,who took an iron rod and bent it into the shape of a horseshoe.Thi
The electromagnet was invented in England by William Sturgeon,who took an iron rod and bent it into the shape of a horseshoe.Thi
admin
2011-01-31
31
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 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 pounds of iron.In the US,a scientist named Joseph Henry improved on Sturgeon’s electromagnet by insulating the copper wine with silk.He was able to wrap many turns of wire around an iron core without danger of short 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 some insulated wire around an iron bar.connecting both ends of the wire to a galvanometer(电流表).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 electromagnetic induction had thus been discovered.Unfortunately for Joseph Henry he did not publish his findings and someone else(Faraday)got the credit for the discovery.
What is NOT TRUE about Henry’s electromagnet?
选项
A、His magnet could.hold 2,300 pounds.
B、His magnet was more dangerous.
C、There were more turns of wire around the iron rod in his magnet.
D、His magnet was an improved model.
答案
B
解析
通过阅读可知选项B文中未提及。
转载请注明原文地址:https://kaotiyun.com/show/23AR777K
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
顾客与商品之间的联系是()
MyhusbandChristopherwasonceafinancialplanner.Eventhoughhecouldn’tbalanceourbudget,hisclientstrustedhimcomplete
MyhusbandChristopherwasonceafinancialplanner.Eventhoughhecouldn’tbalanceourbudget,hisclientstrustedhimcomplete
In1620asmallsailboatnamedtheMayflowerleftEnglandfortheNewWorld.TheMayflowerheadedfortheJamestowncolony.Its
Banksweredevelopedtokeeppeople’smoneysafeandmakeitavailablewhentheyneededit.Sincemoneywasinvented,peoplehav
Afewyearsagoitwasfashionabletospeakofagenerationgap,adivisionbetweenyoungpeopleandtheirelders.Parentscompla
PersonalFinanceWhenitcomestoourfinances,eachofushasourownindividualapproach.Someofusaresavers,someare
Idon’tknow______yesterday.
ComputerMouseThebasiccomputermouseisanamazinglycleverinventionwitharelativelysimpledesignthatallowsustop
TimeintheAnimalWorldRhythmcontrolseverythinginNature.【T1】______Thesunprovidesabasictimerhythmforalll
随机试题
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughtsarecausingfami
Thereisnoendtothemagicwithinthiscircleoftheworldwelivein.Thegreatestmagicianstodayare【C1】______thephysicist
充血性心力衰竭之心肾阳虚、水饮泛滥证宜选用
可持续发展战略应充分发挥()作为第一生产力和教育的先导性、全局性和基础性作用。
11月1日,大豆现货价格为2020元/吨,某加工商对该价格比较满意,希望能以此价格在一个月后买进200吨大豆。为了避免将来现货价格可能上涨,从而提高原材料成本,决定在大连商品交易所进行套期保值。11月1日买进20手9月份大豆合约,成交价格2050元/吨。1
全国首次推出导游资格统一考试的时间是()
教师根据教育教学目的,按照一定的目标设计的游戏被称为()。
所得税:即收益税,是以纳税人的所得额为征税对象的税。根据以上定义,下列陈述中,不属于所得税的是( )
计算机不可能具有智能。因为计算机不可能具有情感,而人的智能又离不开情感。以下哪项是上述论证所必须假设的?I.计算机只有具备智能,才会具有情感。Ⅱ.没有独立于情感的智能。Ⅲ.没有独立于智能的情感。
TheNorwegiangovernmentwouldprefertheoilindustryto______Accordingtothepassage,theoilindustrymightleadinNorth
最新回复
(
0
)