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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic0ybitj+5 ms8v flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that t ,-2p3yrw bszx+cd* t 2ddlv,zhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces whalbn4 v7qu3fczpdp 9u3qv 62o) t kind of change on the inp9vfu4z uc6n323bo dqvlp)7 qduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produnv77 dah y5q f7u(in(btmx. l2ces what kind ofnvb(x (hm7a fq2 yn57l. tiud7 change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what k dqd .n;-szedfor5)556witdf ind of change on the induc- 6f5q5nwfi5 ;o)detdzrd.sded $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed fromjnt(b(*c vt (hnph+r51g9 tab a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directmlbxk5r qj+ (49ac2x n(/edzuion of an induced current in a conductor will be that which tends to produce which of the following effectujnb2 d(c5x4/qkealrz(m +9x s?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A ba3tsovoe 8qly 5r-b+zs qf*j *is3 to/9r magnet is held above its center with its north pole pointi9 5z 8ot lfs si33e*qo+rtq*jo/y svb-ng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held aboustey,5crd3y rm2.i ,ve its center with its north pole pointing down, and released. As it approaches the coil, the falling mage, 2ctds .ymrr3 ,iy5unet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tabli091nany ; xegiqut:y/dz4;ge top in a region where the magnetic field vector points straight up. The magnetic ;u/qgi d y4zn901ixg; e:anty field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level aoxc9n s6mo,nj +6 fw1h1zv)s table top in a region where the magnetic field vector points shox 6zn+ vonc 9)m1 fsw,a16jstraight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fi8 ,ml4:as:f ptj3 t3ta5philjeld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of:3fs8ti :apmjl3 lt,a h54tjp the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and c ql 76v 3czcq utb64l ,j)8kwjmgs*zsgu/ mj3(arries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either si7m*u/ t 3u j,czq68 k6zm)gvj(swg b4sjlcq3lde of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire .+ e cw7,ad u2bwixn1xwith the north pole entering first. As the north pole enters the wire, the induced current ww x,2n1dwx7 cb ue.ia+ill be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotate9 ssm0p o;hc89ap41lvhw qo:ud at constant angular speed about an axis whose direction can be varied. In a region wher90; qm us1aohlowh9vc4s: 8ppe a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about afvw yp0d/rt2dr 2t-d(67flb in axis whose direction can be varied. In a region 2d0ypd2t/ b(ri f-rwdv 6f l7twhere a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law./ 2c0 +8b6avkrqbps ac
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an -(fgh)b-0viqvp nb /x$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. qxlo3szc;n-1a*hpts+ 0 a(fx2 :bmizThe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved north am.inaa,-)9 ,zx f nkpz;iss(ward at constant velocity through a magnetic i9axkz(,snz a ns)f;a im-p.,field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at ac 2kbm;h y (1ebra(kh*whj k(: constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforf+ *xitdlouqf0h8 5q - c(a4xcms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revon:hd:,wqk s+-s kfzr2jw3ys 8lutions each second. The frequency of the ,wkf+sqn8r2- :sw k:d yj3zsh $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tou *f2n3 a4xnk dk+i2fo

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devu)0g. d vqh6uhice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil co0)ad6 c44h3p j;uqk +xmx2do hn,hpxintains more loops than the primary coil thxh460iqoad p3u +d h4n xh;2,xjck)mpen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primar,z5fhi s g.*shy coil contains more loops than the secondary coilshhzfisg5 . ,* then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the ej+mh 1(z5fr zpower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ*x (fe-zsk /u*;l a a)wkhcww0uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected a1m)/ofhw7y1i w4fbtyw(h6 s in series to an ideal battery of constant terminal voltage. At the moment contacy)t7 ihsfh yaw(b 6/mwf o11w4t is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are con/2 wsio;cfh u1nected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros oi;1 sh/w2fcus the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L b nh( ol:-e1diand resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanceszrc8eqo 48/;nlk+yr u;n o. b R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i1v g.onb6)a ykn series to a battery. The time constant for the circuit representg61 aybv .)noks the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor ;:.k wto*zyp fare connected in series to a battery. The battery is suddenly removed from the circuit. The time cok;f p.yo:*t wznstant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:okjshp o i)j18 i(-p6h4ur+ mr

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. zy:fudj xp(.f ai(l)u,aa(k- On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply.x r4 pd,y:-*v gvc/xgn In this circuit, the curreng-rdn4 xxv,gvy *:c/pt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor yr)m q8 kz se8e,nm1)owhen the frequency is tr1 ,m mok8yner ))z8eqsipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inet(7gma7j)jk8z g3 rv-e f xbl7iqj:(ductor is doubled, the inductive reactancegri(8x t jfq7klv7 b7mg:3j z(a)j-ee of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ind,40hs 3 pz2ovwcn5um nuctor approaches zero, the inductive reactance ofonnu z vw,3mh5 04s2cp that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. I* u 6xpr:/.jojd+g kayn this circuit, the curren+.*ao uyp kdj:rxj6/ gt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what facto :yws+fqbpa9 7;z6sm xr when the frequenw+7fs qx z;by:pa9sm6cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, c /3.8gyimmbzr qy3o;the capaci;oz3g8 i/qm 3c r.yybmtive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capaw+k edwd o;muhv4/:a7citor in a RLC series circuw;u7 who dd vem:ak/4+it?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defiop)v0 jzwure4o cz n/s.jz ;k7a7 +v+wned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The e/ nw /j.+uhv sakj j- 2yz:uz 6winvlv:;,eq*impedance of the circuit increases if R increases. ; j/,nz- ea2slv:* jhe.qz /kv j+ wnw:yui6uv When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the uj /:vhr 3qlz.y. z9uf3zcm5lcircuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cina9lknashw 74 d2 :vgadm;h 0:rcuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitppc+mq.-(ds v ance both double in an LRC series circuit, the resonant frequency of tha(d vq c+.mspp-t circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied votsalew i*h l16; j(+6ku nyvt5ltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oc ,/5lwdhgst o -/o yt0vp7d6bmcurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m ism 61+hf;ua tvd rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar+ ;fv6aut1hmd e parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of ra16xn .xpb xl; .mke+zpdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thro +k1;n.xpxlbmz.e xp6ugh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unif1t c1b9c -ia4hj /3p(dtochua orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t11dt4p9h -/( ocucca ah3 tjbihe magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional aw+ekx sinpcahh7j b0r,mnb3 .+.:5earea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes+ p/v)f-i4gtjv5po)e r ebsi5 from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped wi/on h*e9/ukv kth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the aku/v9k /n *oehverage value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ar)x iwg;m. fja,ea of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area (zi/n h pm0)vt$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m b2;x s hf 0hq8*q ns axgnvpd--(p2xulsp*y4,flies horizontally at a location where the downward component of the Ear-2fp( xqs,;s2 u8 40phpg*-sldn* haqnx xby vth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 muzp2t(r3wm9fzknc )) long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic f2 k3ztcfz))rmu9np (wield of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionauzb 1 ,c .2wdf/sehxs.l area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu1j5 6y, hv jniun,um,wrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 5 qhpw f2xo) wjyzg)kzf iej0q-(:r6,12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic fyw5,g-f)fzq 0weh2j6r )jk(i xopzq : ield of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1 8 .sjdnx0atw400 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an oh 8x45b1k4r +dfd yjeeutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil b5erdhf18 e4ydxj k4+ is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wicyaxp5pa0;:.uifu5 iwmo o4gy5 (e*hth a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance oc + x yzgq6c88* :)cds)bwmfft(u3e wcf 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resx ab00yg6 ,1oz7pn( *rcxev(bt.srb sistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatz,sb(ra*0r7 .ps0bntx(gce vyo x 1b 6es a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sub10hz ;ot(5iw llt9 wvpply. The operating current is 1( b1itlvztl h9;0 5wwo.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power syn(t)n2) a+(ivv-if yp9 vg juupply. Th2vn)( ygu-fj(ip)yvv+ ita 9 ne operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc ,x-hsqbhzx6e v2,yfkf)vgyx2 9x70 de 6.0 W is connected to a 24-V power supply. The operating curry ,9,0fx2ve2 -k ) 76 xyzgxvfsbqxdhhent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed x azyoca5rwayca::r:jv1/ 34s c: ne(to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tr)3*bxqv2 . jtfs5mk zfansformer causes 14 A to flow in the secondary. How many turv b2fqf*ts)3 jzxm5k.ns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary aji-49upz/ scp8o; fbin a 110-V primary if the 24-V seconb u;98ap p/of -4jczisdary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500via lww15c6 +:tr1 wcw:kch+o-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the p:6+i1l5w +:c1wt rcwvcowkh a rimary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primarylwztfd5)hv/u81 em:) sd bd8f tqat01 of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconddd8w)dtq:1s v0emtz ) 5b/8afh 1ulftary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0r p9yzoczmy9g -db /6: mA. The primary cb:/6m9pyc d-z orzg9y oil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil an/ t*u1gl sbmfrj +3xu7d 300 turns on its secondary coil. If ul/7uj+mf* 1txgbs 3r120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer pxrt;;l(bmh0(j5vq3 dsmox 7 y2 nu,qhas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 2thlr, 5 ;3 unqbms0;v xo( pmdxq7yj(A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2004qp61va py:cf23 nyko turns. If the input current at the primary is 100 A, we can ep:y36co24kp nvyf1q axpect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn ; wt4.ngwgfi8 tibq78s. If the input voltage to the primary is 100 V, we can expect; qwb. 7f8tng8ii4 gtw the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer h4y4e/l -lh: b uq5hwzjas 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we4 w zl:l-hej5u4y q/hb can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 om ;mc(r ;urw.d2 up7iV. The voltage is usually stepped up to 4500 V by ;.(7urduc;rm2 mpiow a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped uzdptnt) u e6/1g)wa ( l.b(ucup to 4500 V by a transformer and transmitted through a powua )w/p )(t1lu n u.gz6(tdceber line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curreny/sb, ki3gi-7nf0qc vt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the t g q- kvs0,cinb7fyi3/ransmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. oyhmuae ,7 * 76kdi1f*pw5ucn A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energc 7* 1hkomny5fpdia*,uw6 7euy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lt.8ra,ervbk (xa3o v2ong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order t.vr,(3 taaore kvxb2 8o reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W linr:i+ y/)y k+d 2 (nfio1nqjpb5jqg+h ue at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V)oinh y2 :ji+1(ub +fgrq yn5jk+qd p/?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmit.v-fsnsoh l+2e4jue *t x+tz4ted on a line with resistance of 0.60 W. To what voltage must the generatorvuj.-e+z t ols44te*2hnx+sf output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a curvz0 b-msh0u tm 0aw,qwj m9(f3rent of 5.0 A. How much energy is stored in the coil's 3m9fmq0zswbjuhw0 ( tm-v0 ,amagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor a0ue- j -ulxk 76j(vobqnd an 18-H inductor. What is this ciro0uj-bj e7 (q-lvkux 6cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vu1k88-qp bjqczfkz vh)f32 2 joltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC bw;u nz(qk8p, outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of:o :,2fkmm;wbrm j (rx the lawrk;mj(obr m2fm: x, :mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pe m;skpju/ 8bt0y gw28fak currentj0/8sw;2pt bug8yk mf through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powi 6hvb0 yha:/hpag*e 7er dissipated in th0ghh *6bva:aipey 7/he resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W y4 -ag duhr5c7resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5lc.j 4;ra 4fyp0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through p hjqpzg*.z.8a 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance o2. 6i*wd kejrhf a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 H 0:w(vxy1cm9kevpj9hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactbxx3nx8 z3d1k ance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactt-t9so ) ngxh(uc7 ,vsdrc :v4ance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequetogk 9p06r6v:dva p r;aa2wf*ncy of 20 kHz is applied to * ppw6ftgdao vrv a6:9k0; 2arit?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-m sjel757uee l:H coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10v jvae 3 9zllo(no 5.;flyp5rbw6l 63b kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed t;vf8f83j azy to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1f(gn m-yo q0a,200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF cz,ei5l /1p dwxgz r747etzm m*apacitor be 100 W*z7z ze1i 5 m4gedw/xlmt,7pr?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz an kg twfvexjc44*: 4-whd 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit wm6yy(qe3 k9f i7qnpl,ith 12.0 W resistance, 15.0 W inductivemq(3 ypn q,k9efil76 y reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz7q/mj(s 1icub if a 100-W resistor, 20-mH coil, and 1.0-mF cais 1m/cqu7 (bjpacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0- v qp8rlr8(xb /x1j9o5dmdg p0mF capacitor are connected in seri( jldq9 bdrm 1p/px0858xrvoges?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induc+i6w3ytquv nn /.uh0ctor, what is the impedance at 10ci/ v uw3n+ h0yt.qun600 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serimmd m:,tum1u(w w- sw9es with a 20-mH inductor, what is the phase angle at 1000 Hzt 1dums9,-: um w(wwmm?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa( mz6o 3g3:y9hnhavy ocitor for a9 hganyom3 :h3vzy6o( total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor aiw)s hh 11rmqa sym95;nd 15-mH coil to get a total impedance of 110 W atssmraw ;yi 51q) hhm19 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz forv aue jn ;q,zx5oyb(.ex(2 4sh a total impeqyx.h ba;4 e5 xv(eon(2zu ,sjdance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resi+3kmxlfauw5.(vw2q w stor at 1.0-MHz for a totawwuq k5l2 +v3fm. xaw(l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connectasbx nl4; 7y:ted in series with a 20-mF capacitor. What is the impedance at xtbns:;l4a 7y1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with aa3c m1brn;tnexr +w 9/80cnski3k -wu 10-mF capacitor at 1.0 kHz for a total impedance of 45 k9kb8; nmitrun1cscewrw 0 /+nx3 -a3 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mFu.9t1z nvs,tu capacitor at 1.0 kHz for a phase angle. ,1ttn9 zvuus of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seriesko9at-s eh ;7z s(o4risu.ws-a( s-*avhqu;n with a 30-W resistor at 1.0 kHz for a total impedance o7ua-- .w u*(ias; 4-rsas h;s(vo qs nezh9tkof 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series e/:de:io sfzf)6)p+f6b f fa gwith a 100-mF capacitor at 120 Hz. What is the phase)sffodz g: ffpabi66) e:/ f+e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a xn9(aq1c o o2c100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect2ccqn9o o x(1aed in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mvo4h5 y)he 0kjF capacitor, and a 0.350-H inductoroe0 4vhj )y5hk. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 3osf:migbm+:ng)m 5 lp -3gi,w 0 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V,s,i::l -om3ig gpmw+gn )bmf5 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a sedn xjt fp;d7u40by28q ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn pj0t7bd2xyf;nd4u8q ected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne epxo(-n5s p emcea2m+0t-0aw (nv 2kzcessary in series with a 500-W resistor for a phase angle ofp sz-otn wmax (2ce p-(a0ee+0mk2v5n $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R =+nf1wfr,k1) s d dq.;kc*v; hfat 3jxt 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven n as;dfcj,11dkt r + ;wkfh.f3vq t*)xin order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series ci. +,p 4pyfqevircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capf ievp qpy.,+4acitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circf ) heke5 w:gac5x: 7trym 9gs3vff-16bfipl5uit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an4mvoica66t0 a impedance of 60 W and a resistance of 30 W. What istavoc6ia 4m06 the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a hwb6-63vttqdh :g w*.asfzk 310-mF capacitor, and a 0.45-H ind: zt wd6- gas.hqwt3f*vk 3hb6uctor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of l5 xe f7x.3cb18cctpo a 1.0-mF capacitor and a 15-mH coil in series?5c.b1pcctfl8x 3 x7oe

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF c qsnz9n81 bod4w1 smr-apacitor for a resonant frequenzbsnq n-1 4 1rosmw9d8cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant i; g:sx0mq +nwfrequencyi +wgsqmxn: ;0 of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plar7vg3l84xbilrp6* m o2fn t*cced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circul g8rv4 *6i32nm 7pxr*tclb ofit is to be 1000 Hz?

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