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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 b9fc- 7uc;o0gspnn7 kmagnetic 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 induc 7b vu9)3 s+7j6gnq7il pte:omud pdi2tion states that 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 produces whatx; t:*uz/ 1web2r gxmy kind of change on the zm;by 2x/ur :*g tew1xinduced $emf$, 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 l2( 4zf8 5fgn nuv wel9wlw0j-field through a loop of wire produces what kind of change n l94w0g5zu(lwjf fwlv8n- 2eon 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 e3/qc5zjr: qe produces what kind of change on the induced 3:r5 ee/czqj q$emf$, 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 an qay.gih9v zhk;bqjwn6g05 * -$emf$ 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 direction of an inducew jyr45w uan.4d current in a conductor will be that which tends to produce which of the following effects?4urwwj5y n .a4

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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 horizo,3kz z 7k d *)cix,;eydezwtb8ntal table. A bar magnet is held above its center with its ze t38;kiwc,*)kybe7 ,zxdzdnorth 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 av)m8prjf r6qe+ 1 5aoiyd. za; horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (; . oyev p)f1+ia85zrj qa6drmwhen 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 field vector poe(tr (;ouwv+kints straight up. The magnetic field vanishes suddenly. When vitw(e ; v+krou(ewed 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 top in a region where the magnetic field v dm1de-fqv) vo 3/ p4(w6yavgiector points straight up. Th wgie 3f/(d)d6 4vvyp1v-oqmae 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 horiqf q7 yeyoz,9h e1z;l.omrn66zontal table top in a region where the magnetic field points straight down. The magneti;.me r ze616yfhyz q qn,o9o7lc 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 u uyjrv k +uys+am,57(kiy+rrs.ox54and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, t ( , m4 7ksouajikrxsy5y++rruuvy5.+he 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 with thkym vfw c.:yh xi8gth6*(; n;re north pole entering first. As the north pole enters the wire, the induced f;6tr :yw cihvmn;(8 g.h xk*ycurrent 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 angular speed about an axislki3i cqyt* oi+ -i60q whose direction can be varied. In a region whel-i *qiq y0t+ikci63o re 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 an axe sj*kt-5v-:elquo 5n is whose direction can be varied. In a region where a unif-tn koe s 5eulv*qj-:5orm 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.p59-odtt,y tnkyir 6 9
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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 pfnv3-o4 -f1(pzjnk. er)9xo hz)gvb 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 magnetic field. The 0 -ghrh d79gplo4 6auc$emf$ 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 direcf*2f(f a g,wl((pukn mtion) is moved northward at constant velocity through a magnetic field thlk(uf(p,w* 2ffmnga (at 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 ro dsog*h8dn *-jtates at a 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 4*zqfg3cev h, transforms

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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 df9w 2ruf;b zahc1: +yvwk ou 6e7-q6dthrough 60 revolutions each second. The frequency of thb:a76+-6k9wqf 1u yvr; cd ezfhd uow2e $emf$ 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 devicsqrgiazm335x 1yg f/ /e 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 devics*.v 0m(-txzedw,6b c7rzm b:cb jsy.e 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 contains more loops than the primary coi*,6i 6iaquvs bl then it sbiv i* q6,ua6is 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 primary coil contains more loops than the secondary coiw(/r0ixxj2 uu l then itj/0xx u2wi ur( 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, thxy9mo9 kq 4wi/ wxw;+c u8e/jne power 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 resonanvvcvzv u6k. n 2;zfj ay5f0o1j mg5c95t circuit,

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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 qv)i)sj6v 2ty-g jhx 3r) k56qlu6ydran ideal battery of constant terminal voltage. d u i yqrv 3sj2 x)tlg)r6y6jkvh56q-) At the moment contact 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 conneca 0gxyq+elmf*x. 3) rfted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the )mx*.q+gy rff3 xlea0battery, 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 indul4 8jlyrqm0hn8nuuc93( cfq*srty9 6 o;os l.ctance 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 r3zad, z sh:xn-bk ar7hg*s2m6 esistance 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 in series to a battery. Tp70zro3 f wzw2k2ow)phe time constant for the cirprwko2 ofw0z7)wz 2p3cuit 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 in qp5mg/hze8o; series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for th po5;qzm e8g/he 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 havez s1a72j: d:evmbd ix9 the same 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 powe8yyf+8 mf bn(,xu)wsqr supply. 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 pow 1x67zpgkt wa4er supply. In this circuit, the currentx7az461 tg kwp

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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 fackeg:t *3,v4gh yz,9mh8quti otor when the frequency is tripei kghy o9htmuz:v *3q4t,g8,led?

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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 inh /yxjz n(r;6g;ln/l(vgr0 ppductor is doubled, the inductive reactaln/r(l(6y rh znx;gv/ pj0; gpnce 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 inductor zga yx0)q+ no+:*8uizfih c2v approaches zero, the inductive reactance of that v8y nizqf)0 aoc2u iz+:+ xgh*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. In this circui5:: mhq9pyk/v fvo t8qt, the currempqv:/ qtkvoyh 89f:5 nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanc:d ew1gtht08.m .hv xve in an ac circuit changes by what factor when the frequency8 h detvgm0 1x:v.wth. 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, the capahp//gtlgmzh(h u36y8f 9vb1i:dwwy : citive reactancef l:(/1g3iyum8yh: h d9w6h/twgvpbz 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 0jau ;(vs-va;yjdix 4a RLC series ci ava0-(idv suxjj4y;;rcuit?

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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 definz f9c4-ybz(moh (xn:ned 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 qaa78y9kqp g4 impedance of the circuit increases if R increases. When isqk q48agpy 79a 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 if kc;em y/iwzk)h(m)u 5 , pa8qiit2-qm$X_L$ 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 inc:jyt q4t5 mhz) 50pcvyreases 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 circzwl ig e3lc 6;c4,wky9uit, the resonant fre;,9w y i el63k4zccglwquency 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 applied vola0k h 6v0 n nb0o;mi8jb0qam;28x rhpttage. 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 circuitnj 37ap)5b,ja/ij,r, dwzkhl 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 rotatin/xh 4tj fm8eh;g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when tm /x4ft hhj8e;he 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 mjj sjq97ee82 upp( 5bis 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 vecto7m9 jp8bjpe s2juq 5(er 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 uniform magnetic fiel)f*iyh5g: cqf d of 0.20 T. Find the magnetic flux through the loop when the plane of ty )q:* 5fgcfhihe loop and the 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 area of an adjusom*et8kb7sucb db4 6, esfx(:table 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 chabsn7*6 zms(uwrt/yd7 nges 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 200bjehq- k /-n;h 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 fkebq/nhh ; j--rom 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 wirwzx* ev afq-ewm ;+56ge with 15 turns 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 gka/-f;qu.dx ) nmqg-r7 c4jmand 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 horizontally atlw xh;,lu5x*2 u:sc n ohfaz0- a location where the downward component of the Eha:nxhxll0f 2 ;,ozusw5 -*ucarth'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 thpv9xjp6hj9c.c esj,,x y 9s2x +d:upiat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constandxp6,px:9j i,j2 sh jx9cyp.+e suv9ct 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 andsrcigj 5 2i j(s)pw+hj+t)hm( a cross-sectional 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 o,ya5lhe awl1x4 c+dx9f 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 6qkfze;.c7 q .dnr 9xiloop is 12 cm long and 8 cm wide. The armature rotates at 1.qx 96iqdz r ef.;ckn7200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field 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 100 turns of wire :cl d;) 9pgx wbt 3cgv+ue9hm2of 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 simplg3l;;k nouumc21 8aeee AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field 3ecn 2l;e;gu1 8oaum kof 0.050 T is available. If the area of the 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 generator with a maximum u(qkh;r)f s82h co6r.s 8mve e$emf$ 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 reofu e 4x;rqu/:61otgu sistance of 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 resistance of 6.00 W. The motor operates ufeskfr /)*,/jr/*ndkmvak qmw7m+7 on 120 V AC, and when running at full speed it generates a bac, /+*fkqvj)/dwf7*7 r smaemmurn k/kk $emf$ 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 resip1eh7rx) o 17rin*u ukstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uoph1e*7 iknr1 7rxu) 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 resisttxig1* ll 6qfq(ai +*vance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. ig1+ i(6 a*qx vlqtlf*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 resistance 6.07t3 ltc0 kxg*m/* qha2wc2jla)fh0 l z W is connected to a 24-V power supply. The opera 0lh*cj0kc *t2l xmaafgw 2q7z)/tl3 hting current 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 needeue/ur ngj ;n *52 s,wmi/wr;jod 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 prity1e/qai7lufq ,*:h rmary of a transformer causes 14 A to flow in the secondary. How many turns are in the :,a hq*eir7l/q u1tfysecondary?

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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 primary if qdn yo2 *vcq/5the 24-V secondary has 100 turodq5c n/yv2*qns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists o)(na6k gn5p 842n t uqhuc/souf a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, so4 nk u 2uq8u/(npnh 6c)ta5gwhat 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. 8s 1rjy +(xwjgAssuming 100% efficiency, how many amps at 24 V can flow+j1xy( jg8 rws in the secondary?

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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 ndz 0srfv+ o4je0bp 0*neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pr0f db p0se+vrj*4ozn 0imary 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 heme,tba7 ;+aau+/a:; dxcej . u,:ict g o3dqeas 60 turns on its primary coil and 300 turns on its secon:, /e7xea ab ti3qujmco;cuad+, g .:+taee;ddary 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 60 turns on its primary coil and 300 turns on 32:uwb i ,aufnits secondary coil. Iiuw 2an3 bf,:uf 120 V at 2.0 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 hase ek3o+ v 2mjls.2yy+l 200 turns. If the input current at the primary is 100kl+3yvy 2e2j.lm+ so e A, we can expect 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 hada2 ljs -nr4gkd1 y+d4y5jlrqom17q;s 100 turns and its secondary has 200 turns. If the input voltage tor 4j1o qk +qarn-dg 7llds;y1y m5jd42 the primary is 100 V, we can expect 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 has 100 turns and its secondary has 200 turnsx7znpkdol1 n; ;,qa: d. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lodoa dlq17n:x,k; nzp;sses)

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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 voltage pwx6/u fk0o,gyq:5 f2b wst;o m+vw-nis usually stepped up to 4500 V by a transformer and transmitted through a power line of total, ;t+-2vks mf 5bofq60wxu/:opw wgn y 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.zmhno9 cr mto5,k 0;szmgg40q) f9dj. 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 percentager.hnmod m z0,54g gs 9kq)9;o0c tfzmj 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 6i(. 0s/xaq ih-m cx)up0 A of current 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 sc-x x0ui)ph/.a i(q mlost 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 resistance of 0.,4fb8mtc 8 t lnl2mncs56q(j j60 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 of 100:1. Whatjcm 4m b8tcsl j6nfq2nl 5t8,( 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 l1 00o-1aw djd,ymdrhwong has a total resistance 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 1drjm0w aw,-yd10 dhoturns 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 line at 1000 V. Hoq(m4:ihu g y 4qwn/ss3w much less power would be lost if the power wer3 qsnywsg4 /u4 h(iqm:e transmitted at 3000 V instead 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 gd ()srrlgw(-) edz*og6j3e+z k xc)gtransmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power lossgs z g*3cd(-dr) ke )xg jwg)(6zo+elr 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 th;el wxwv965 y g6azpb/e coil's magwa;bxp / 5g6ze9l y6vwnetic 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 resis ph19go31vt-ve ud2 gntor and an 18-H inductor. What is this eugvp no39g1ht-dv21 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 irr 5fk26 :jvdns 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 intya2*4))f.+kwoxsjtmk* ldsp o a 120-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 u0iybzdn k4s q 1a aiy1r;9oc0np:3d1into a 120-V AC outlet. What is the resistance of the lampi 0u;sda0 9ry: y iba o3q4zc1n1kn1dp?

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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 connectedwy/bq ,e;n9fh to a 120-V ac power supply. What is the peak current / hne,9f;ybqwthrough 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 power do zhb.b/o+n3 be0+ihfiss+e 3b nioh0f/+hb.obzipated in the 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 5ka-w 6 8h0k lhn-5uolz0-W resistor 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 rc-10wqrshktixx:-y* o18 *qls dljj6 esistor 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 a 0r)eo ,1xqf:j fti(rj 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 indutkgm m 98hb 0of8d(q9hctor 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 reaka4ah b)2l3a uf8;ldoctance 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 14br r9x u hlv;6-tfvbw +9/utr4.0-mH coil have 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 157 W of inductive reacta*qy/ zw f0 kfev9l14sqnce 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 frequency of 20 iwnb y3ayzz6 8jp/n7. kHz is applied3j8 .n/py zyn b7z6wai 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 through a 2.50-mH coil due to a 110-V, 60.n h1/vz(w45, lioxxue i(w-hd0 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 uqnuz 7; 3,f.ywzwpo.0 l msbjj3v3w9of a 4.7-mF capacitor at 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 reactzcmk // nv1hhcd*e7a 8ance 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 1200xfl: vfq4 2aud kv ot6f+i4*i: 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 0eeze.l kk81 z4.010-mF capacitor be 100 Wk . ek4lz1e8ze?

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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 044c3ueue c0 jr.0010-mF capacitor at 1000 Hz and 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 with 12.0 W res;j/ gko cm:jid;uj0t1istance, 15.0 W inductive /tcuik;1 gjdj0m; o:j 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 Hz if a 100-W resistor, 20-mH cjg2ul5i jw t ccf))pxs)5idg,o/ )5kcoil, and 1.0-mF capacitor are t)5c/lsg,jcu2ik5 ifg)) pjxwocd 5) 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 resi l8 a huqxnrbzt42 rv5u8:;vr+stor, 20-mH coil, and 1.0-mF capacitor are connhlbvq+5 xr;a 2u8:v runtr8z 4ected 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 connectedutz*sho)4 -xm in series with a 20-mH inductor, what is the impedance at x*mo )4zhtu -s1000 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 connect3m+/yy6wozs l ed in series with a 20-mH inductor, what is the phase angle at 1000 yws/3z6y lom+ Hz?

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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 cadp 243uof zu1de5 m+pircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 2 o13fdd+u4uap5zpe m 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 b o,j0oe (2 ,wrvf8gjtljn 6-uis needed in series with a 100-W resistor and 15-mH coil to gnfw08(- t ,r2j,lgu eojboj 6vet 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- .lpyfe 22uxdqkeksz/.,p(h/mH inductor at 5000 Hz for a total impedance of 40000 W? h(y2kxzp lq,2dk e/s/e. pf.u

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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 resistor at 1.0-e; zwld gz)wj-vpdzacc;.hdt.x6byi: 1 /5a +MHz for a total impedancda:. ;c.x acwj iv)/h-51dtezy6zw b plg; zd+e 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 connected in series with a 20-mF capacitor. Whew,2rk.e u j*fat is the impedanf*ju, w2e.rkece at 1000 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 serifpefoyt) ;zh 1fh f-:0es with a 10-mF capacitor at 1.0 kHz for a total impedance of ffze fh : p01yo)t-h;f45 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 1.0 kH/sb8 b ipn 8;i(iuigr0z for a phase angle( si;ig8bi pb0iu /8nr 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 series with a 30-W resistor at 1.0ju-dm8om9z.c rbffqw ;p 2 qxl4nq(97 kHz for a total impedance of 4w .- xrdq9(b8fpoqc2zun qj fm79 4lm;5 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. Wzo +9 jcd kp7v)9p(dbkhat is the phase acpz d+(79)bkpkv jdo 9ngle?

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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 if9jo9ou4go5 xzreo5ho y sc /.4 a 100-W resistor, 20-mH coil, and 1.0-mF caseh 95 ou 54yxoczo9j.4ogo /rpacitor are connected 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 100dh4:zr8rx4r rfy+ di,-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit? 8xrfr dzr4dhi r4:+,y

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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 30 W, and an in, kgv*f7xif g9ductor of inductive reactan9* ikxff,g7vg ce 30 W are connected in series 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 50a; 5u- v:gll25zafqavqq) 5jd-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe 2flv)jl-a:q5zq5 5aad qgvu;n 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 nece /-1)zxk iesb r-za ic25a7tuqssary in series with a 500-W resistor for a phase angle of-qu i/esk a7z- tb1r x5ac)z2i $40^{\circ}$ 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 = 20.0; t,o yghq xu ks+5*hz5i-gw-psaav /* W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be dr;a*t/ qvao- s+g gish*yx5w-, kupz 5hiven in 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 circuit with 12.0 W resistance*qq mgv6r(rp; , 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cm*q(qr;r vp6gircuit 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 circuitp 7g s8tn.s84nwo lx3c 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 v pw:wyvrann,/ 6.z6 nW and a resistance of 30 W. What is nav:.wny,6rn p v/6wz 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 circuid h di))u;2bnst containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H insd;)dn )2 ibhuductor, 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 a 1.0-mF cape9 qn iaqk0pg8 gndu4o; 89s-pacitor and a 15-mH coil in series?qigo 04uepn8qg npsad ;k-998

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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 resobdos*4gd, yj (4e1hmunant frequency of 1jh 4 ybs(* d,gd4umoe10 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 resonanigkf/se2,rjx n/y v-7t frequen-/sg/r, ixfenjk vy27cy 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 placed in series with a 30-W resistor and a4*a*yy zhx;+exkbs )e 40-mH coil if the*;zks4 aheb+yx)* ey x resonant frequency of the circuit is to be 1000 Hz?

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