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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://autoconfig.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://autoconfig.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 flux *d/2. cc9 3cu)f tqesz7b m mz5wydh:dexcept

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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 induccw3r;2 lh1whmv m;4y f:upg: ction 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 kp.l ypqmp8 -aw3 xv(/wire in a coil produces what kind of change on the vp(xl8 q/a.y3p mkw p-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 *o*.2cvr w:d7lba d:k9im1m1k -;wp tp ksreamagnetic field through a loop of wire produces what kind of change onpeaiadwm1 - *1k d9wb.:ork* tr72cs:vl k;mp 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 change,(gk c*q9fcf+hzc t+i on the indufqc+ k9(f*ih t+cczg ,ced $emf$, 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 fi e. ubkfhp-:g4eld 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 conductor will ukh5d:.xp(zf be that which tends to fxuz5dk(p.: hproduce 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 th/ dsbv.i nsd,r6cihap2z,76:2ep etable. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above6:6r2nhs2/zevspi,7cbta ih, . pdd e)

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 horizouaebi*tl3 80wntal 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 inducelw*tb ea30i u8s (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 field vect5w*es4sq275 jud 6ml qwlvl3 kor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil asl 3s 5k6qs d5 jlm42uwe7*lwvq 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 lb r 7rvlp8. y5qd0pp b0vbs-9cevel table top in a region where the magnetic field vector points straight u-8 c vrrp.by0 9bs75blpp vq0dp. 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 4x sg7.yuh mfc/ 3 5jb*oiuw4wa horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from j47g3*u5 fswmxi4 b w/cy.ohuabove, 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 cdb v8h-;xhqlf6as-qq38ct -larries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewe3hxb-a ;vct - l8-qhsfq86 qdld from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with ./au n:cbm/hkuq*1: /g oz zq *u4f+dbg/owuzthe north pole entering first. As the north poq :zocbh b /uzkzn*a wug:ug oduf4/1mq +/.*/le 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 wir5:yj)ye uo jx9gmb1r957v duee is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetg oj7eyeyb r5)dj9u5 9mxv:1u ic 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 )b onckqtj t-9 7(f, b4xgc4blconstant angular speed about an axis whose direction can be varied. In a region where al,b4jo)b cn4 kb7 tcgqtx(-9f uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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.d)b b kyzpjxg2z1-. 9t
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an*3d1/uu odttya6i2u u $emf$ 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)x7ui n 4ka 2vvjnws(n e34*gb 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 the east-west dc jc:- *;bjqmmirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a stm- :q;mjjc cb*atement 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 constant0a +b.1c:wzkx, ibfrm 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 k kqkm+l:*2jitransforms

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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 frequency of t5p/zinfq ciqc62i *(w- 3tkwkhe *q k n6 i(-2f/c 3ckiqwptw5iz$emf$ 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 la 2r3(zk.ujs25z./ lbv.;o g ymeyhwto

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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+o8pvd (i4jbv gvpd* xtjn 32/ 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 s hqjv:axm5;:ltmq: qw90l-d eecondary coil contains more loops than the primary coil then it iswqj:lqm9-;vmh:: t 5x aldq0e 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 loophr j/h+q 2pz(ws than the secondary coil then it isj+ /zpw( 2hqrh 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 n gmm,kqm: scup3p ( 4/1ytuy;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 cir7fu,d u,2 y;;*h*rgiqbikmef cuit,

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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 cooeacb; vpint69o1pd 9:o4.a tnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acroso9icpn4o ed;ta a:t.v 96 1pbos 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 connected in series to an ideal batteryh( dp.u qv/ai; of constant terminal voltage. At the moment contact is made apq .dvhiu/(;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 indum :az kafv6b(hi,523zl mn (cjctance 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 andv ddw n4v:yy6qcd 9wnqx7+z9 . 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 connected in series tq7dx,wf7n (uvhi( ba/bc)(dgo a battery. The time constant for the circuit rea((cqd7 d,iw/)( bngu7f vxhb presents 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 inductc* so;p4 supj*or are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requ pjsou*4cp*s; ired 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 unitswy 7bmr:o3ph(k m:jv- 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 tlq873,ry8g7 v9 vpwo pa6knom his circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. k 2q74noa*frsno 9y9yIn this circuit, the currentnn9 74 rq2sk fyoaoy9*

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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 -jvjdcj05+y 6 . hr27:ossrpv cdg) srchanges by what factor when the frequency iv: -scrv so+ .j jp0dyd5)cr6 2jgh7srs tripled?

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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 u8n d8b2u epau4t6 :axAC voltage across an inductor is doubled, the inductive reactance o8na46p8at bu u2:d uxef 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 fe9ful hx5t 6q*.dlr-an inductor approaches zero, the inductive reactance of th xhd. lu6qr *lf-etf95at 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 polm/;.qno y*53 brq rx idj*yv/wer supply. In this circuit, the curreq*3j/dr onxqi ; b*m.rylv5y /nt

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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 whan)ansq7 -6ev:xnp5tqt factor when the frequency is tripled?sa5p6vnqt)nq- :e7xn

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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 acrosfo8qs r ez1/*tg /xr*qs a capacitor approaches zero, the capacitiveto/rrg z ** 8exq/qfs1 reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between thdo vwmp x lz7ckx w;5p-lbm5030o;+bce voltages of the inductor and capacitor in a RLC sbdczm0 +vwwpx - l05m;ko 7olpx ;c5b3eries 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 ictfnk1.6forb.pe 6* bs 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. The impedance of the circuit increases if m oe+ -xn7 nnnp1.di;gR increases. When is this statement true?nmnnd1g.ip-+o n 7x; e

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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 incr,7l 86) apmdf-f)sxotlq / /jmume5dzeases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cirf2m(a9z- h/xam+.lz zdgmo r1 cuit 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 botitlp( ;/3grg0 ni , *qbma7uyfh double in an LRC series circuit, the resonant frequency of7/nu qri if;bl0*,t(gapym3g 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 voltage. At reso hu03vi ;(nlmonance,

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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 ci cbi.nc5 h.g611rnm h8jw1zcx74cz trrcuit 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 ramb3ybbcau+ 26dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the 3bbbm+6u cy a2magnetic 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 uniform p*k/f5bp7eaq c*uz;x magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arp*zqfb expac;*/u 7k5e 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 ed e:vh5ac-z:p /6ogid of 0.20 T. Find the magnetic flux through the loop wh6h/o5c-di pv ::ez geaen the plane of the 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 adjustable single loop iw61)2drxzmry x9b gd/s 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 changg;dxd--xldof( b b,a5es 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 200 turns of wire on a 89 lh,nz9mu-wfm.m8ylmvf q7square 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 tu9l8.ylvhwzf,8fq-m9 m m m n7o 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 turns and an area xc ltaww3m0,9of $0.40 \; m^{2}$ 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 areat46pbb3j6nq4 )if jzk. qd 6un $0.20 \; m^{2}$ 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 at a locati 3 5arg3rt;fosuh5oa;on where the downward compone; oh5os5graaft3r3 u;nt of the Earth'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 at dq4ww:;f s638 f+6ns kwg2aqwwm9fkba constant angular velocity of 2.0 rad/s about a vertical axis wb6maqk6;w:w 2kfs4f sf 3w w8gn9q+dthrough 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 loops and a cro2o(gh wtdi4qy8f9i-8e pk nf,ss-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 i;iw dn: zp4km:m4jxoy/( hv(area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm linv63 kzx7 jg2xjvr1-(w08mfycok1tong 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 0.30 T, which is perpendicular to the axis of rjxz8x0(6r2 vwk jfvcn7 y3 kgim11-tootation, 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 aj(xzd2lj+0 y/uw dxq6rea $0.090 \; m^{2}$ 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 constru16pva ngd6g2a06 bj ngct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is 6a662j10dg anbp n gvgavailable. 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 wirs qgxwsyi/0o ;u1yhv7t9/m, anv.o *th 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 +t im dp0/a 6g9*cnh 9jdx9 :dsfvrf4rresistance 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 motkc,:qym9ra e8 or have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatrk,ca9 m y8qe:es 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- 09lwbxs,zyomy g*8z 6.0 W is connected to a 24-V power supply. The operaw-m,l8gzz*oy x ybs09ting current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resist- :o:fo qq-eq0nre gi0ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is toqo: eq-0 0fng:rqe- ihe 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 6.0 W is connected to a 24-V power supply. Thfue n3ab3ae,(e operating current is 1.0 A at f(3ea e,3fabnuull 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 need80 1ddlhyv.nj lc2yj0 ed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A tox*rrxop/8j u 9 flow in the secondary. How many turns are in the se8r orj*9xxp/ucondary?

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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 5q ,h6fpp mjs0primary if the 24-V secondary has 100 q jmhp 65,fps0turns?

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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 kv ab0u91v3xp-turn secondary coil. If the current in the sa1x ukpv390bv econdary 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 ,zo e9 0c bj7oo v54g(d+webargv72kuthe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow iga2 krde05,4 9vg o(b7+ocvuejoz b7w n 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 neon sign t -p2 dqph4d5d8jnx z6hpi/ok6; vcbc(ransformer provides 7500 V at 10.0 mA. The primary coil operatej6c42ddo -v;zp /(nxdb6 ppchk 58qih s on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primas-a )gu na,bq1.j7 tu ivr3fv9.fd 0(hqx+ hxpry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is app )ar vhqn f1v -js.iu3 g+thxq 970.bxaf(pd,ulied 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 06g(zecspf3ic;tq * s 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 presen p;(fts6*q0c igcez3st 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 ok6zqypa+/t- fwfz4 w( m1hz ;has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cur4a k-f+yh/16zmo( ; pfwqtzzw rent 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 aa rzr:x,s7p *lul- 6jturns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the s-p7rua6 :alzr*lsx j,econdary 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 turno 6m;wh nvq(s;y 78c:gyj+jsgs and its secondary has 200 turns. If the power input to the primary is 100swq:cvg8mo 7(hy+ js; j;6gy n 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 voltage is usually steppeq9m x1lok, a4jd up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 t m aljkx419qo,urns.

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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 ll:jn,a8ovpm2 r b q:n)9ie*iusually stepped up to 4500 V by a transformer and transmitted mab8 )nvlj ei2 r:*lpnq,: oi9through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A bezvpmd * c;oqv5a,ydt(-;mu)tv)e:of current at 120 V. The voltage is usually stepped up t;)d)d,mm zv -q:oteat5(; pebvc*uvy o 4500 V by a transformer 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 total resistance of 0.60 bki;0wn4e j2u0yww21- m ykadW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the origi mw0w;4wnky12 ae20jyk ub-dinal 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 resi(9nhu dvi y*+s h9z t:3lzka5gstance 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 of 100:1. What percentage of the original energy is lost when the transformer is ulu hzhn*+9 y zd:si(kt59gva3 sed?

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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 2w/v8w0(edw-p mrqym a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at m8 rw q v/p-2myw0edw(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 bqwd* 9) mzjw,ze transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepp)zzj*9 m qwwd,ed 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. bb,; l,w4e j:yn+ies u4ioq/v How much energy is stored in the coil's maqi;w eo+bi/4,us nbjve,4 ly: gnetic 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 cont2wt5+gd xm0scgt1+e j ains a 6.0-W resistor and an 18-H inductor. What is this circu5gms e 1txtg02w+c d+jit'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 rm(z7v k(qk) rphs 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 120e/4jbyopavnzst i) 7k( 1;r4r-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 into a 120-V AC outlet. gfins ba;gj:c9nq-8:3s19 iu a6dn cj What is the resistance of the lamp? bgagj9:cc-ndna 9nj 8i:u1iq s3;f 6s

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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 peaalww)*a bk ; c:e9w1jxk current throug kweb*); acxj9a1 lww:h 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 p;qhq :+b,2gvn( sre niower dissipated in the re2re( n+ibh,q;g q:nv ssistor?

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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 5ez eqz n-)qjv 741o*to0-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-okdib (i,,zcxz bf71ht 4kp49kwu56oW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50 9da z sp0qmgjvq2dw9 3cb 6egko)(q/4 *2sdmz-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 +rtiuhl t)t;7inductor 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 inductive8 oqbcuwpk26w0rufx ,lf -gm9j(3u + z reactance 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 :xxu8c6vm t 1hyv5cq2gsr,z-or +v 2ahave 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 induboz06 )v17 mema wno1zctive 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-mHt6 pcatdcp -6731lmwjrkk+ k : inductor when 120 V AC at a frequency of 20 kHz is applied to 3dkkc k6 prc1a:j7 -w6ml+tptit?

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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 t (y1*.p9 kan m4dql5dmalc3rjhrough 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 1e1v9b 1gm lczwfyuq64w6pa ;eb;p3 v 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 i(9x ,.w+lmpovwam 6y W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 4 s)anz cn5i/t h6f1kc1200 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 bfi/1z 7ow6x18e hzvnbe 100 W?viehzwxb8 1 n76 fz/o1

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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 thro .0 yzizm23 sf+oyc;+tlyexy6ugh a 0.0010-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 circ8 /qpjlm14wwc uit with 12.0 W resistance, 15.0 W inductive reactance, and 10mwljp 8wq/1 c4.0 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,xlg y0 ocsp) z,dn7e3: 20-mH coil, and 1.0-mF capacitor are connected y s0n:dgeco)p7,3 lxz in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mdmsm6ckou)1e6zj1,-fck ) c hH coil, and 1.0-mF capacitor are connected in ser6c6sm)hkf c-om)zdu1j, ek 1cies?

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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 inductor, what is 1 u xq1+p8pvdgthe impedance at 1000 Hd1 pvxq1+gpu8 z?

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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 connectejb/.b oqm m)6cd in series with a 20-mH inductor, what is the phase angle at 1000 H.j)bcm/q omb6z?

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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 serkn ) oma.b;c;aies circuit with a 20-mH coil and 1.0-mF capacitor for aakmc.;);o nba 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 series2dyy-iqfgi/ h t :.j/q with a 100-W resistor and 15-mH coil to get a total/.:2y d/yg-hiftqqj i 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 inductor a.wbd3bce1c 3 *pgq5 mdt 5000 Hz for a total 3*5dde .qg 1c3c bbwmpimpedance 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 t8c d 9)tqvlqgi8u3,oh a 100-kW resistor at 1.0-MHz for a total impedance of 1538,ot9)i8cvqtd gq ul0 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 s7oxmlhn cp8xax; h*(jhln0 20 eries with a 20-mF capacitor. What is the impedance at 1000 Hzm* lhh(a l7x2jcn nx;xp0o0h 8?

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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-m o5( i5o 0mev8wk9it dj:j*njsF capacitor at 1.0 kHz for a total impe98oj5si0i :5ovj wm nktjd(*edance 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 neededai2w v /.hmiwkz vm*;r5iu0 wem 1 6up4lv+bi5 in series with a 10-mF capacitor at 1.0 kHz for a phase awzr5ep+ muvkw0v*u1w 25 /iavih4 ib6m;i m.l ngle 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 f)(0qhn kfhuqa:ht1yd5 )sv0 with a 30-W resistor at 1.0 kHz for a total i(v0 n udt0qs)hk:5yqf) a h1fhmpedance 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. Whabr9gm6k5fy i (t is the phase anm ir b6f(ky9g5gle?

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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, 20-m11uo+jim2ie:wpm y*zH coil, and 1.0-mF cappw+yi 2 zj*11moumie :acitor 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 100-W resyyx1u . s9-spk+1nxwhuw3o((h+ns ifistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz(9( xh wsyhxnpu uiksnyfo.++s-31w1 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 camk2*ue u wtt07oc: 5wnpacitive reactance 30 W, and an inductor of inductive reactance 30 W are conneum7tc5*2wo w e:0utk ncted 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 contr/jm 8qo.q7)c1hs y.pv w+zw yaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sum1vrq+ w/py.c)ojy8.zq s7hwpply?

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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 5 50 t3 q4qtn+iuj*3vlhhxu,.x0dp cqy00-W resistor for a phase angle o 5qu30*u+q.h in0vh,lx4jt xqct d3ypf $40^{\circ}$ 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 fyfekdbhh*vt 2m -v* ;l.m*8vl : *jvefrequency should the circuit be driven in order to have maximum power transferred from the driving sourl8*m k vlfm.ey*; :ev*f2t-hjvbdvh*ce?

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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 circezls 0 t8p/yk.uit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capas8l0z/petk. ycitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iyina;bag;f d-t 1jl,) 9pd rr.j 9giy-s $63^{\circ}$. 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. 3 znj8uoc 34tyqwr2h W and a resistance of 30 W. What is the pq3hzj84wc.toy 3 n 2ruower 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 seru -kmi2q-t2k: 2ofx meies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 2 t:mik-uokfeq2x-m2 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 and a 15-mH coil in seri(,i l okq7c1tob1tgf1es?fc 11(7i1,bott oqlk g

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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 resonant frequ/o l0ax896 a(n2m0lqgje l fe )p-tj 1twmbae+ency of 0xm e+jt6/mtl0be2 p8alegl(a-)wja9q n1 of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH i ho s1b-w odx :du7b+eq)4o;ircl )k9inductor for a resonant frequel4i rk-oxo oe+ ) 9chdu7qbd;swbi)1:ncy 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 a 4i :yb8f cb3wy:0-mH co3:y ifbywc: b8il if the resonant frequency of the circuit is to be 1000 Hz?

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