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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 magnetic flux excepdpe7rj +(f4( sx6qj0jo) pbblt

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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 tl4m.a) pwn)sj .harc/hat the $emf$ 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 produ/-j/ 9i+ mpuouzhi bse608 p(kjml1gwces what kind of change on thehg/pusjmj(/9z + oel-w8b u16pi 0mi k induced $emf$, 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 wiref:nse4jg 44u 7gzf4ns produces what kind of change on:e nuj gsf74f444zs gn 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 kind of chan( q hwam amb59xbq0ktmj5itj;o,/5:l. 2 liz gge on the inducedq a ;mj (it55q,bl0x:zk b wh.5/oatilgmm2j9 $emf$, 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 from a magnetic field acogx8c b d- 1)p sie:lbmlpm6c66t8-cn $emf$ 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 directionjbyk- g;hjk5) of an induced current in a conductor will be that which tends to proj);5hk gb- jykduce which of the following effects?

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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 bar magnet3ymtc, p en06adx-s3t is held above its center with itsme0ant ,y3c-x sp 36td north pole pointing 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 t hy9zp8p.ds bxb2* 1ahorizontal table. A bar magnet is held above its center with itsatzy1d.*89p bsp2h b x north pole pointing down, and released. As it approaches the coil, the falling magnet 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 table top in a region where the magnetic fi.kd iovkufk -xr36q;. eld vector points straight up. The magnetic field vanio6kxkdu fk.-3r ;.iqvshes 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 table to.ic4ehmewqnj 9 d 1z+1p in a region where the magnetic field vector points strad1.qj149ncz m+ e ewhiight 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 whereyqf ,rf*l 2t3d the magnetic field points straight down. The l*dq 2f3f ,trymagnetic field disappears suddenly. When viewed from above, what is the direction of 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 carries an eveywn5li- d:nja;:z 2c ir-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currn:wni ;l5-cijz2ya: d ent 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 with the north pole entering firsm n0ma4znf94 )hlr rye(df(c3t. Asyr4(lhfn4e arnmfm c93z )d0 ( the north pole enters the wire, the induced current will 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 rotated at constant aj2.lkbao4a c2eceoo) z eme; -e50e -angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of25oaoja-el. c meez0k)a-be4 2ecoe; 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 :ld.z i2aztvn6y 3pdm2x8b s 9an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orient29 nyd263vs i8za: x.zmpld btation 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.vph6m :z )rq wq2:dqxatkh1)+
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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 ht/d8hq eaf+5w 5 yda2fyz;h .an $emf$ 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 magnetz l(q we1m16 fni2s2reic field. The $emf$ 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(fmo 6s6bsy(j the east-west direction) is moved northward at constant velocitjy(m6b 6 ofss(y through a magnetic 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 a constant angular sm26 s;fsh9snin-5kb 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 e 0dseh0p* e6ttransforms

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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 ro8;fievntqkjsv 3277 k4(s pnevolutions each second. The frequency of the ;tn2v7j4s ifqkpeks38 n (ov7$emf$ 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 dez0nsr6c lxf y3qba*0, vice used to

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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 device thag/:s58fapp /xz.r birair /; tt

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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 cydnx)ii 8zc *-4o amhsn+b gwx4i* 6p:9tf:rtontains more loops than the primary coil the-xn pb:4st9*6*dowz4 imiah f ri)g:nytcx+8n 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 t5 jx wfo*4c)dx brgf0-he primary coil contains more loops than the secondary coil then rf)4-f0 xcbd* 5owgj xit 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 pow yfbr9t:( yu oq3di-l4er 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 cirrl6ak j756p p5:xr arlq8z+jicuit,

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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 in series to al-lia+r3 9ikwwj) 7fd n ideal battery of constant terminal voltage. At the moment contact is mada3i wfl 9-j7lrd+i) wke 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 connec b )5cf8:mvhp-b:lbxqted in series to an ideal battery of constant terminal voltage. At the momf:h8l )v5q-pbxb :bcment contact is made with the battery, the voltage across 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 inductanc:v8i-wrk fg 2r )4c0sr;j 8v4xkmrqqre L and 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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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 resistance R is connected tor1y a 0qvd 5akbdesi;i 5kv-(; 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 induc.y hk4y2f5hwv.j2p3 bf dao,s4pso8ttor are connected in series to a battery. The time constant for the circu.2hkh 5v.42o8ybpffj yopt3s wd,a 4sit represents 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 are connected i1ec ;/0cz)c9 hnn:u cz:asawu n series to a battery. The battery is suddenly removed from the circua hzn:cnz 9c1eu:cca; / u)0swit. The time constant 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 sf)l je,9w k2vi n8+hurame units except:

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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. On this circuit, theqtd3.a75qbp- ycwhdc+ 48 vsv 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 po1cx kg/c 3s 3caa73td pjch71ower supply. In this circuit, the currenc1c 33thc/3sj1agck apd 7ox7t

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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 acnmigf 1m 5n8b: circuit changes by what factor when the frequency is tripled?n1:5g8mnm bfi

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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 inductor is doublen/:;lk)lkcrr 9ss-y;,wa fi xkng)i9d, the inductive reactance of that inducton xklfgl;:)ysa i)ikr99n-s ,;/c wkrr

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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 voltago;x 58erugkh:v- h0nne across an inductor approaches zero, the inductive reactance of that coil;5rhxvh:-un8 o0e g kn

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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 6cpods7,hbw:ezp0x :y6 .llky1 -ucaug 9u *yan AC power supply. In this circuit, the currenycl*:0.u,c xd79eppu yy 6 l1gukb: aswh6o-zt

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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 ;pxagtf p2ata.bs7 zj.g5 2 6 maq0y;nfactor when the frequency is tripled 0a .b2 ay gafj apts;25;x6tm.qpz7gn?

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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 c 3hx1eml6ly;uapacitor approaches zero, the capacitive reactanl ;hyxeulm613 ce 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 capacitor in atzu, 7ut.erb9 RLC series 7ur b. et,ztu9circuit?

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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 Riuik99h*3fawwo jqli86/lvn(g s +i5 LC circuit is defined 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. T fu ab;t ,ewd7flz) 0h/d+dot7he impedance of the circuit increases if R increases. Wzl7w d e/+; 0dtd7fo f,)hubtahen 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 circuit increases i6.t w m 5d.iqex;.wj3mnw9qjnf $X_L$ 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 circuit incrvq) x3fr21lk seases 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 capacitance both double in an LRC series circuitg;amdhcjv5/c 2j ,k* t, the rea *v 5c/ d,jm;2kjgtchsonant frequency of that 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 app1cnlomzx45dx2k wt0x *sdvkc(l(., ylied voltage. 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 circuitnc/g* ep 8oo 7dn-ylq* occurs 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 is rotating in a uniform mak -2hprx; 2(2am-f ig*ikrkav46dhr sgnetic field of 0.20 Tm-a;2a rsp2*gfh4i-dv(x6ri 2rhk kk. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 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 radius 0.10 m is rotating in a uniformakca+ k-i,b9o03e*4a 7cy)eg eumw mr magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are per)u0e, ea*kgyma ebricao-7k c49 3 +wmpendicular.

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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 uniform m ;fuhn c*zb.fb1l( 95o,tacr7 fbowv;agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn o, lt.*v;a;751fnz fc(c9 rofbwbbuhetic 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 area of an adjustable sing3lc9 -x 6d/n uag+tx4 oplvok,le 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 changeszj5c)f1 rtcth0 rfplwzx9l:w0+ 8n z a+o,wx2 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 with 200s*qperxbg: 2 , turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendiqes:*xbr,p2 gcular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 turnsz3 wer*5sr + kqq.+dpi and an area 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 andvt bfun2mpui0(7l0 ikj* 2d0o area $0.20 \; m^{2}$ 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 flies hoynkiw3m h2 i;8gllsda,7 p 6a*rizontally at a location where the downward component of the Earth;ki lagnl d7s3 aywpm28 hi6,*'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 m long rotates 9)ax:iu9m8d lcjn9/m7obekkat a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while 9 9mj)oi l:9k k7 anemd8bxc/uin a constant magnetic field 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-/3 7uqnw+eh.: tzyscnsectional 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 turns of g y /7c tr(y18bv (aewi/cfy0rwire 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 (6a/j mpn0n:pf 7w fcscyjp/(is 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 field of 0.30s:n0 p6c(p f/pwc( jj/7nfa my 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 h scv tn(+9p)lzu2j8y 100 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 general2g)p z+i7r jetor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of 7jig pr)2l +zethe rotating coil 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 generatorjizqen 1)s/s 1n9 s5.s6b sju0 yey9gm with 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 of 6.00 W. The motor opera9cle 8)pfjhovj :il2cd.tb, o-(p(sates 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 d.sj0oi) h e/nresistance of 6.00 W. The motor operates on 120 V AC, and when running at no/ 0)j.ehdsifull speed it generates 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 supz nhu4*dcrzp 7nx,i* 7ply. The operating current is 1.0 A. What is the start-up current?rx4id* 7u*cz7 z hnn,p

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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 awf972r0weo gq;b xnp-g8ig2 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wh82 e09gogrg;q-aiwx 2b f7w npat 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 resista 3xu 8/dprnl3hnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full pl/hdx8 u33n rspeed. 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 to reduce a primary voltagp-wyc0quvxc7x fnc - .h- )d+ue 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 t1n 6sr5wfzd56s,7qjuxtt. c bransformer causes 14 A to flow in the secondary. How many turns are in the se,j5 5nfxcwzt1.7sq sd b r6ut6condary?

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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 in a 110-V primarya*yiuuez,j/e 7 a;o2i6yhi. e if the 24-V secondaehi6ju;o,e 2. i/a*yy ieu z7ary 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 500-turn primary coil and a 2000-turn se r .u w7mzu .nbywmr6d.l)40amzf5 rf7condary coil. Ifb7frrma u0z6n 4z7mw wlyfd5.r).m .u the current in the secondary is 3.0 A, what is the current in the primary?

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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 primary of a transformer. Assuming 100% efficien+hi5(a9 s5jh vzl,h dpcy, how many amps at 24 V can flow in the sesz9 ,dp5lhh vh+ai 5j(condary?

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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 transf /ov) h2 reqszk;.5bdsormer provides 7500 V at 10.0 mA. The primary coil operve2 srqs.o/ h;5k) dzbates 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 turnvx,* 3 u, q.2+joglmi-sl ebous on its primary coil and 300 turns on its secon v 3+js ,ioqu- b.2lx*,geomludary coil. If 120 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 has t cq 4wz2e+ucpuw9-o360 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pre 4eow-zt3u9+pc qwu2 csent 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 9 4 ,n , )gkub88 k3aqv*6sruicvnggkgturns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output8gcnkn9u3ig q)bgu* v6grv,a4 s,k 8 k 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 it+x 9sm2 2 l6+yje*qafb dhqv4xs secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to mqxqab+l+j9x6yvh* fd2 42 es 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 has 100 turns and its secondary has 200 turns. If :9bxd,ng0 7*yxvx q tqthe power input to thxy vd9x tg,7q:n0x*qb e primary is 100 W, we 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 V. The vol6 mc2 7. ob i(vg9kfht.jse5gutage is usually stepped up to 4500 V by fhe k.jtsb 57 .cvm692o(ggu ia 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 step,rkaeh)sq9w; :z+aapped 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 ta, az9we:+;qskpa h)rransmission 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 current attnjipoyn( *r88 e.tcy) +bt5l 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throu *c5tyrti8l y 8j)bnen+.t(po gh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission 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 resistanc3:0f4s ame tx45nf *5tlmspt be of 0.60 W. 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 0 s54stapn3t:mtb54fx melf *of 100:1. What percentage of the original energy 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 long has a total resistance of 0.60 W. 7 .yx,vozsg10 5rbsjv 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 1 rv 7o5zsx,0bv.jysgwith 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-Wdt;ms;5h ;bp ).botgy line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V ih)obtp ;;bsgmt5; d .ynstead of at 1000 V?

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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 transmitted on a line w kw65v uo+hqk* .e16qdlof1zvith resistance of 0.60 W. To what voltage must the generator outpuo k5w1h+6z* 6kolf e.qq1d uvvt 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 current of 5.0 A. How much energy is stored in the ch vqyv6)m,nnxel:5a kx9qq e)0n*yr8tr18puoil's magnetic fi 6 auvh1qqep)lq*ky 895rnv0 xx)nry8ne:t,meld?

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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 and an 18-H i( gfnhd,m 78lh.bs79jims p2fnductor. What is this lm b8 7df s.g7f9i(hpm2shjn,circuit'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 voltage.kxhdbbshdf1: cyfe(h +p tt*c g)+ -3 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 1tp x ; 57z(/wqtktgq j:n.y4cx20-V AC 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 wnv 8n8r(wip/6 l k/oqinto a 120-V AC outlet. What is the resistance of the lamr/8lo6/pnn8 (wkv wqi p?

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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 peakdumho;f0 f. -0fv;gs oeheh58 current through the mf08f-0oof ;gue.;vhh dhs5 eresistor?

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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 achle( t xn1tn5j1mp/ a( power supply. What is the power dissipated in the resisto(5nm/jl1 1haxttne(pr?

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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 k 3er4a je 8eyc;cj.q3resistor 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 50-W resisv3hqox/n)z:f09vl fa tor 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 af-d4(dr /rd// 3 xea8dwtjyvx,;idtm 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 of a 1.0-mH 57:8h-- n/ewjxj:l ttru 3m qur6hpjxinductor 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 reap 49b23jvy79c7py+vtq vvzw g ctance of a 2.50-mH coil at 1000 Hz?

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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 0jh-y .s+6 rmc7 sbihphave 14.0 W of inductive reactance?

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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 1xac*o2 ,( t:/nonktyh57 W of inductive reactance 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 whernyxrv6dh. 2:vp:: jhn 120 V AC at a frequency of 20 kHz is appliedvr2vndx. :h: p6jhyr: to it?

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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 throughy*+5ojwefn+c- v ;yk c a 2.50-mH 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 z9jejz8uw8rw8 ;)rsjlfg6 ez3b389rrw l0tb 10 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 to have 50 W of capacitive reactance at 10 kHz 5 lpzm mqxk(7*cb1yfp96hcg-?

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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-vfbgj 3sm. x4.mF capacitor have a reactance of 1200 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 capacitor be 100 Wtc v9 kw,wlj tv2q4*/ect 4 kw/2 ,ve*wvltqj9?

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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 and 5.07-q dr m96 u bf6,+l)je bvnoh/lyqbm3 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 with 12.gk mbli;vov6 v3)0p 1 o(l15kmhabpg, 2ozqw)0 W resistance, 15.0 W inductive reactance, and 10.0 W mhq vkabp0)g);vv og3,iw1 okb 1lz25 om6(plcapacitive 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 rp ebm:ox)rll (tn4 ,f+ir ;q51500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec+r, 4(5; rnrxetq lmofl p:ib)ted 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, 20j mp)wh5b(c 97pavdge (f(f3i -mH coil, and 1.0-mF capacitor are ca 9)ip7gf(c53f bmh(vjp wde( onnected in series?

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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 in.dck )j*d80vzgj+b r0zlc 6 caductor, what is the impedance at 1000jcr+*k0)6c0 dl.gzjv db8a cz 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 series with a 20-mH indozd(wki5 .(l3f h5ihouctor, what is the phase angle at 1000 H. 5old f(hz(i3khiwo5 z?

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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 se 0d8cob) qb;-osthomflq9y16 ries circuit with a 20-mH coil and 1.0-mF capacih)ds o6yo;bq1b0- tcqm 8f9oltor for a 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 resisto exi y)nejq l944(jxd 2p)zpv,r and 15-mH coil to gqp4l4v,e) x(j2ype x)i z9j dnet a total impedance of 110 W at 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 inducto8;sr(knrc9 s:cw9fn5c wvhe 5r at 5000 Hz for a total irf e;c5 :nrss9c8n w(v5hk w9cmpedance 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 wit gc/yxo:/ g.njh a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?yxg /:/goc .jn

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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 connected in ct9wq : ,i/( xyhg/k( u08pr/yrtckxs series with a 20-mF capacitor. What is the impedance at 100/wck:(qgirrkc s8xxu0y yt( / t9hp/ ,0 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 needeizq*p8q l i:,fd in series with a 10-mF capacitor at 1.0 kHz for a total iqqi*i f,p z:8lmpedance of 45 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-mF capacitor at d qiv6 3.fea9nqi2p gi.jg8t+1.0 kHz for a phase angle of fv6ggd83ti q+eq. 9 ii.an2jp $40^{\circ}$?

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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 series with a 30-W resistor at 1.0 kHz forg3btf;a +grb f)z z6v. a total taffg bg)bv+r;.63zz impedance of 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 with a 100-mF capacitor at 120 Hz. What is xx:n /3d,t z q7*vlhibthe pha: ibzhdl 73t,xqn/vx *se 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/ds f.+l wt1pf and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conwp/.s+ltd1f fnected 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-mF capacito ) lojuj,k(4scr, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pow(4cl,jk jou )ser 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 reactancexd8. ne3gs et. ze)w1cy- c-ud 30 W, and an inductor of inductive reactance 30 W are connected in serie-c x-1eezd8)enc3tgsw . du.y s to a 110-V, 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 series RLC circuit containing a 50-W resistor,n7s 5,tezecr ) d.zd+h a 10-mF capacitor, and a 0.4.s,+ erdzecdhnz t) 755-H inductor, when connected 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 necessary in series with a 500-W resi9.olity(pk v6stor for a phase angle of l. vpot9k6i( y$40^{\circ}$ 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 circuittmh:, +6kn cgnezt2)c has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tran n k e)m6:n,2g+tchtczsferred 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 circuit with 12 i/aj/(ri tj -m2ouhi8.0 W resistance, 15.0 W inducau ijh/j2-8 rtoii m/(tive reactance, and 10.0 W capacitive 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 Axkx3lc o 0sb4-C circuit 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 an impedance of 60 W and a resist2yqsvl:p,)i8 qso(,bja )wcg ance of 30 W. What is the polaqb2os(ygs j)8qv:,wi ) p,c wer 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 ry*:aoa9 pkzpy:d t.qx zv)/0kesistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a zp k: d/v)z.ay9atkp:0*qy xo60-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 a 1.0-mF cap5 d;bcrm3vn jbzka, b9ybwt +c4fq601acitor and a 15-mH coil in series?t16jd bc5br yb3;z,nqv cmwak+ 90f4 b

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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 capacitor for a-91 guucwo eko agg1y9e++6 av resonant frequency of 10 kH+19g 1ckvyuoewgu og6a9+ a- ez?

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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 n bkupwd7qa8+.+;oe,*dj3 sc sb(rcba 3.7-mH inductor for a resonant frequency of 1000 7j.ks 3 w,n*8+(cpa;rs quo +d bbdcbeHz?

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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 mk8:nmjvda 9ckqby)g.k)z +5 be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of tk 9d)v5m +agc)b q .k:8yknzmjhe circuit is to be 1000 Hz?

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