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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://autodiscover.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://autodiscover.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 magnetic fluxt wel2 yrqdn /hc))1-f 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/kqw7; *+*rxop8zjp6 p ikr mshe $emf$ 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 ie3 gxass yr.0p xw:/5dn a coil produces what kind of change on the indu/s53 yds:e .rpx0wga xced $emf$, 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 tj/qjb+0 a oa+phe magnetic field through a loop of wire produces what kind of change on the i +qpja+a bj0o/nduced $emf$, 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: gd9h)i1q twkw9qozj.zc*q .zgp*y8 loop of wire produces what kind of change on the induced *9 qzgowq yhp)d1. zgc i8 *kq:t.w9zj$emf$, 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 ryjweudw;0sencz+95*s f 9 5 rfrom 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 direction of an induced current in a cr6qfny)7*mk*g ow( w lonductor will be that which tends to produ**wo rf)wgl7n(6kymq ce 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 magnet wkmk14 ubg. xrgei (i-h*.-ddis held above its center with its north pole pointing down. The stationary magnet induces (when viewed g xigk1.ru -(w*h4ked-.midbfrom 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 hory8j k5zz8u/m nizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnmkzuj/85 yz 8net 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 th ohtm (/dr0e2ge magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadest mr/ (2doeg0h?

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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 ar zkj60e:k 8n/t7 ffqx9dg-p r region where the magnetic field vector points straight 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 increx8rnd6 :p0gq-ze9 /tjkk7rffases?

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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 thev5d /rob.qji8 magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currv o5r8q .bjd/ient 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 e(elh f 3woqle.i 251gwang ,d(. w)uxa horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithg2wwdlx ef) q35 ,1oih (g( aw.e.eluner side 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 througg,qmze l* -i4e-zhsf ,h a loop of wire with the north pole entering first. As the north pole enters the wire, the induced currezl - ,ee-gh4*qm ,fzisnt 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 anguhs(+t b2mi wf)lar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must bew)msfi+bh2( t 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 axis whe38v3rghyd ; pose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of therd3h3;eg pv8y 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.w/ ryvii2c8s2
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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 au;a-k0z2 xewdi q) zpxq)-n;y f0 3pjon $emf$ 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 afg izh.m3suo p va.5t+*utx18 magnetic 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 inp33jlz8gmb0 yc2hm(c the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential in m8zj 0lcy(3m32cpgbhduced 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 cobhx tfo:0w (d*nstant 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 transfof-+o lijhu mfj+od+)9rms

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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 revolutions each second. The fr8umv5hnyb se8/ee:h3 equency of the 8sbheun 3m/8eey v:5h $emf$ 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 t+lmti* c+ id8vo

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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 d8g g)pk5 di0kcevice 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 co24 t3 xz8g uzox0.ejvfil contains more loops than the primary coil then ix2tu zovxf03je. z g48t 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 primary coil contains more loopswb gj9o8l51msr7)r la than the secondary coil 9l)8mwr7r a1ob slj5gthen 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, th6yaoi4w y3pw,w aly+4e 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 resonant circg.py wx+8vvo x5hr ef 5i47r6buit,

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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 se frp ,ux*ba a2ug.(u/ c--yso7fd+ 3xgsontt:ries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across ogtrs,ty7g2df: pn.x+ou-fs *ub x(au3 -c/a 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 arejm3 k/4hn mww8 b6hg;ok4a)zbe5st 2w connected in series to an ideal battery of constant terminal voltage. At the moment contact is w4et hwmk5a n bh2j;4o3wbz )86/m gskmade 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 inductance L and resistance R isv( 7 fk69xapb r;jnl1d 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 inductancesr20* rk au(8u1c jaoo 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 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 conngx u1c50 dywa*ected in series to a battery. The time constant fodgyc01u 5 *xwar the circuit 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 induafh.5pigf qc isa*50s -o*k9o ctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time con5 *9og* aifq0s5ih.ckpa f-osstant 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 uni 0-s c:qxyj0jdz6x6l5h j2sz jts 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 powqiedf9)kyti,c/q (m9 ( 1 tpjjer 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 a8z/(+fy, m zbfklue :01cvlfpm 1sz5AC power supply. In this circuit, the currenfumz01slb 1:m e5c8pka/(fyvz+l zf ,t

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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 when tusnx+l5u7- sw)pyd6e) r*h kk6sb8ey he frequency is y8xewu6ssksd -)*6k+ep7l u n)h ryb5tripled?

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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 t:aey+a66f*m ya;6fzgt3j lz cwpm-k/he AC voltage across an inductor is doubled, the inductive reaf63 y;azj ea ak 6mypzg f/m*tw:+cl-6ctance 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 approaches zero, t7;tuu)kydz k,he inductive reactancek )z yuukd7,;t of 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. In this circuit, :d 5 nx::vt*vir2c 4k sp+fhkiq7qh4qthe curren xs kv5qvq 4:tq*i7+ d4nfchki :2hrp:t

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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 . (7uq5u vse;ywyjm ar w(0pbrg238s iwhat factor when the frequency is tripledb3(wq jwa.sm gre ;pvsu2u8ry7 0i5(y?

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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*-prf249ahi/ fas 0hc;kumuz.x e k 0p approaches zero, the capacitive reactance of that capac2r;4/-f hzspupcmu 0 9kkiaf hxa0 e*.itor

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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 inductok z jb9k:h1h0xr and capacitor in a RLC series jbk zkhx19:0h circuit?

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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 deo3nih-ru eg0-fined 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 impedance of the circuit increases if R iso wvuoc+p3p/mo ;bxoq69k0 (ncreases. When is this state0 mpbcos6k ;( x9ow+p3oovq u/ment 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 impemnp.*r54v ;ffyaais - dance of the circuit 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 or:rym qn6e .br ;oav10f the circuit 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 capacitance both double in an LRC seri4p 3y 8wjfley;es circuit, the resonant frequency f84;pwl 3ye jyof 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 asnqk v k p+6+jzoa+395d 2baifpplied 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- r2a 197dww31w64fr5tjee nazjvu rm RLC circuit 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 mt52kd *7za7hgtx q-kk is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loo a7gtq*t z2h57kxdk-k p 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 uniform magnjjwg-s q2u/r0l:2kts etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector a-u st 2k:qw/g0jlrj2s re 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 rokkxa*7:trl 12qntku / tating 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 vectol k2:tk*qku/ranx7t 1 r 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 adjustabll8 .y tb-ah w1xau8+ls+z0tc me 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 f(p t3umq: iiap*ewm,( rom $4.0 \times 10^{-5} \; Wb$ 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 200 turns of wire on a squvoot-ax(0kwe9j 0 iv6 are 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 average valux9vavw6 eioo- 0(tk j0e 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 turn6b mox,(7y 6;ds4m phnp;likgij (vp ,s 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 and areewjl-yu :a+:0z)q e xja $0.20 \; m^{2}$ 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 yaugfd ;ya0; ,span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fielaa ,d0u; gf;yyd 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 o8el- w( ys*uy)x jv8kthat is 2.0 m long rotates at a constant angular velocityso e )k8j- l8(ywxvu*y of 2.0 rad/s about a vertical axis through one of its ends while in 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 l-iu ws/- c0z,ak5vn ym6 mwt.toops and 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 of wire of areaz: .8 (,7umpddu wxdty $0.090 \; m^{2}$ 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 nxiu59 2 fu ukv4ou;y5kz87bw rectangular loops on its armature. Each loop 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 unifuw kx u5u5boik4fnvu zy;82 97orm 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 of a 2om +:fbwsj70sra xmxsrj505 rea $0.090 \; m^{2}$ 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 outpuf6:sjul;asfg 28 xp i(t of 12 V maxii;:j psgl6u8xs aff2(mum when rotated at 60 Hz. A magnetic field of 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 dfc7;9d,tz )g6 k jcuka 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. - );z8h2 0,wodwackubljvvl resistance 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 re a(i8f b cb;qqb6)lb5vqt:.. The motor operates on 120 V AC, and when runnin).qcrb:5q lq; a8 bfev6bi( btg at full 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 supp u,xc:k1+n/xi x. kehbly. The operating current is 1.0 A. What is the s/ ,x+xhinc 1k u:bxek.tart-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 co2c5 bkshoyb o4 b(b8b1t0f-vunnected to a 24-V power supply. The operati0f2h8b4sbcov to-k(by5b u1 bng 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 resistant6m a.xb 4dcl,ce 6.0 W is connected to a 24-V power supply. The operat6dlb a,m.c4x ting 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 needed to reduce a prim z,0qu;i/2kpiwsf3w se0m i2 mary 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 transformer ca:f:pxv.-f eka d0lwgn d1 5ku-uses 14 A to flow in the secondary. How many turns are in-.ak5 ddeg vl1u::wkxpf-0n f 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 in a 110-V primary if the 24-a 1smi5- t3txx foz2ugue-,y8 V secondary has 1083m2o fa-g,uixt -useyz t5 x10 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 y n2x17.y2n,mwv6pq8 x xduh l500-turn primary coil and a 2000-turn secondary coil. If the c8u2yq hxxy.pnd12mlv 67wxn,urrent 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 transformu +i )/jlzyok7er. Assuming 100% efficiency, how m zi/oy)+u7kj lany amps at 24 V can flow 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 ookey 3+e3 vom*e)vt ;uh0b+ lif a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary d+yeb) ;o uokv 3v0elmt*i+e 3hraw?

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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 prima,couo/lfcz62i +x m;ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A ia2ui6z,c ;m+f c xoo/ls 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 *pelf qn+j +1 i8psh4yon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to qi+jyl841 +pe*nfhpsthe 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 anls y1hc qv-v/2j 42puod its secondary has 200 turns. If the input current at the primary iuvjo/ 421-s lhc2yqvps 100 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 tra:qcq i(i(n/sjc. j t6 2w 7gi0mmmszi:nsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to b(i0mm.ziqs/jqgi6 n :(tmw is c7:cj2e

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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 haxye )n rxka5wy*q* 89cs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the9ac)5**k qynrxwyx e 8 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 voltafsszu 60/ *e(sl-j bdl*kgfd8ge is usually stepped up to 4500 V by a transformer and transmitted through a power line-*kesd l6*l80(fu dgbf/ zss j 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 uxh )hel/oz*p)a 10cwip to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percepi) /h*wlh1a) x0ze ocntage 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 current at 120 V. vr,(r eo2kb5z3ka1 qk The voltage is usually stepped up to 4500 V by a transformer 2k5vbeaqrk,1 3zrok( and transmitted through 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 todaya kv5cgjj209v h rf.0+nt,tal resistance of 0.60 W. A generator produces 100 V at 70 A. In order tacdftj9v vk2r0h,yg5. an+ 0 jo 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 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 resistance0m 8gynevs 7j1 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 amjn 8v07sg ye1 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 line at8fw18k,z *zxim2len,hrx( fx 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?ikz1x,e2lh88fz*( , mwx x nfr

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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 ;4l w.dr--c 2ek 8afklnela;u with resistance of 0.60 W. To what voltage must the generator output be stepped up with- 4e2nc.duwk af-ale 8r; l;kl 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 curren,evvf8y3qd8g4ch 05 vf chr:l t of 5.0 A. How much energy is stored in the coil's vch e g,dvy45rffl8 :cv h830qmagnetic 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 rej a;u .,r1zdbxsistor and an 18-H inductor. What is this circuit'xbz;. ur1da j,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 r( -l:2xgh vrmmms voltage 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 outlet. What is the peakoip ((un ,l us3g+c2ijfv/xj+ 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 g* olp0xkgcp3 -e/6ml 120-V AC outlet. What is the resistance of the lamp6mg*3 ole-0pcplg/ xk?

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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 peak cu1c3pbgaf x-tw.p;s n71t -tw urrent through the rtp p.ab w;1-wgtfn1txs 7uc-3esistor?

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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 powencfx/:1k2h qht 9o2l5xm lvdgr+ -5bw *n*l izr supply. What is the power dissipated in the resisx2zrfvkqt 9d o1 lh*b /mx *:5nw2ginc5l +-lhtor?

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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 resisp zm/2pzky4 )c ygr/n6tor 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 resistokv+t,gn l+y90j zrkq 1r 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 axtznwv.7- 20 oygm*tafz2a 5j 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 inductor at 60 Hz?6og 2pvrw h,k0

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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 mku33i wb95cvqtea x,.bn,t 01000 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 have 14.0 W of inductive reactanr t+co8fif:7m6 6szaxce?

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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 i+fua ayi7d5 j9nductive 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 when 120 V AC at 6 (jrg8bcf0;7dajmp aw-g hb*a frequency of 20 kHz is applie*c b-rg( adp8g6 bjwmfj0h;a 7d 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, 60.0 H)tdny :r; no5mz 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 10 kHz?ca )z yeeod*dfyo-2.5

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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 o k,khk 18xnbn+f 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;npe;)i;qsd wg r0 ml5 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 +nw2 i nqlat:*100 W?qi+ nal*:nt2w

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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 5.4jw) ou7wi8zf oe+n 97p wz8e:8cyffc0 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 srw wvp yq5ntphu r.8bftr35z01: 7(qeeries circuit with 12.0 W resistance, 15.0 W inductivef3q r 0.rwe utzhp7 :(p1bv5ywn r5qt8 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 impedanceoe*3eo/1ybz e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriese obz/3o *ye1e?

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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 i gy37 wl e-j-ipk*()k;cxisn, 20-mH coil, and 1.0-mF capacitor arewiisjklyi7)e cgk-x(3- pn*; connected 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 connec3wg(;h,6(risf dsq kw- pts*nted in series with a 20-mH inductor, what is the impedance at 1000 wd3rh* q f,(6 (;tnw-skspigs 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 connec5agar nboh 0u n*;hv6/wo2ef-ted in series with a 20-mH inductor, what is the phase angle at rnnahb;e *ao-w/5 u2o g6f0vh1000 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 circuit with a 20-mH ,tcb n0-9bber coil and 1.0-mF capacitor for a to -reb c,bn09bttal 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 an/-hwd5 .p )q1ryiuy x8jdujv0 d 15-mH coil to get a total ijwy 08d -) 1vuxhid/. yr5jqupmpedance 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 seriq3 oj:eu/qd4 jg k4,ldk-r+epes with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W? jq+4gde ,erou dj:k/p 4k-l3q

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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 p2/f w .cgpnme9l(fz- series with a 100-kW resistor at 1.0-MHz for a total impedance of 150. e2p/f(fmcnp gz9l-w 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 capacitoro pn(qe ji,-b udh;155 yfxia6. What is the impedance(5dio5;jf qb-h 16 nyiaupex, 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 series with a 10-mF cadw 3-a191ehyfcn6ge *l ne nzzglg1 9-pacitor at 1.0 kHz for a total impedance of 45 W?1ag1 9c1yl-nz n 9* l3engefg- hw6dez

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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 ser4 3pbq 2ed kd2ukvn.5hies with a 10-mF capacitor at 1.0 kHz for a phase u 2ehd.v qn3 4k2p5kbdangle 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( ;krioj9 h9sv with a 30-W resistor at 1.0 kHz for a total imps9( j 9vhi;orkedance 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 100-5j0t+m hm ic;z,8yed cmF capacitor at 120 Hz. What is the phase angle?mm05h;,yiz8 +t dcc ej

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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 100-W resistor, /6hd) y wgtk,ausu* o+20-mH coil, and 1.0-mF capacitor are connected in seuoud ,+th/yw ga6*sk )ries?

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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 re -3b 44rt)vjvsb:zmf 17a dmjrsistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connectedr)zd b jf- rbj7t:4v4svm13ma 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 30 W, and aswc9i8/hfj m4n inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows /8 4mfhj9wcsiin 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 j0v ll-(dnqflrc00 (54da0azhm0mdi, a 10-mF capacitor, and a 0.45-H in 0 -05(dlhi f v cdmajllnq0(4d00rzmaductor, 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 necesp nj4op8 g)b5wsyx 2*wsary in series with a 500-W resistor for a phase angle oy*jbx) pw 2gpon85sw4 f $40^{\circ}$ 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 W, L = 200-mH, C = 10.0 mF. At what fref gerciqv2n 4-;b* 5ms3*lnbe /fvfq* quency shoul ls3*;/vieff*cgb2q -n v4*bqe 5f mrnd the circuit be driven 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 W4ros ;dw7u*rf66z xebwb-+j c resistance, 15.0 W inductive reactance, and 10.0 W cad rw o6+ujb6* w7;4-ebszxr cfpacitive 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: hy:) 8ayxp5wvdud.dw 4swj 3 AC 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 h b+tf;-r dtb7v:wj4 ejas an impedance of 60 W and a resistance of 30 W. What is the power factow e7;dv4rt j+b-b ft:jr?

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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 containa47b gk brp 108a67vxjzhjmjwypa7(9ing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected topp9j7rg h(8 ybvbxa6a j1 7mw j7zk4a0 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 capacitor z3 oszvj+-m/r:hs* ziand a 15-mH coil in series?shs:j+-i vzozm 3/z*r

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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 wi)obst y u 02vyv0v3oz uu.;0p ,gt5vwvth a 4.7-mF capacitor for a resonant frequency of 10 kvgvuutooy 0b2 vsv0z0v y.3,)wpt ; u5Hz?

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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 se1auv;bf) /olaries with a 3.7-mH inductor for a resonant frequency of 1000 Ho a1lf/ aub);vz?

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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 infmx b9 etypm61l+b r 3)pum*;3gn1kdn series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be ld3n+ 6 mbpmxkynpeu1 ;bgfr9 m *)t131000 Hz?

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