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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 exceptgx r+.+(7xf:.q ewksagao nt(

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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 :8 xjt;dbq*g5dyr dr )h mxb/)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 nm,qmen s;;/b60c d kh8cr;myof wire in a coil produces what kind of change on the indus80my cqdr,cmn ;;/e6nkhbm ;ced $emf$, 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 cxtvj6jyyr +34f;a.v) .cxwbfield through a loop of wire produces what kind of change+vcx t x.rc ;j)3a4wyfyv6b.j on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a l5ktf bj )l5us(t c.xm4oop of wire produces what kind of change on the induc45fx5ublk)jc ms.t(t ed $emf$, 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 a;v )s16-y mpb ksteiz9n $emf$ 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;g 5:pzqgmmu 7+zj,r)wh uta- current in a conductor will be that which tends to produce which of tu q-tw, m5h 7 ag)u+m:gp;rjzzhe 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 lies7 ; h 2qgw4ldzcl(r1h*harin /84btsx flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induced(*q xrt hgill;snz4a2b7h/c 4h81w rs (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizoeg9z8 kst bn nm8sk 5la9z;i.;ntal 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 (when vieweb lgk9et a88s n.si;m;59zkznd 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 we3a -9ijb7b 4vfox-ein a region where the 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 fielwbof-j4x73a ev9- ibe d 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 yfcs8ql, wli)h)d+ s5where the magnetic field vector points straight up. The magnet+58)s qh)w,yclidsf lic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal ta3v ikx0u,i9kcble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly.03 ,kixcukvi9 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 hd r*gc2 kp;m136c xte 0cb5bhvorizontal table and 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,k0eg 2chvt5*1r pc c xb63d;bm 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 the north pole enl:3oa* xk b32x le2c1cnntq,atering first. As l x3,t ko1c32n x2albq*an:e cthe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constan hq jd 5)mjdhd23h)cuy5a)ur0t angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the d)mjh203hjuh)5c5yadr qu )d 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 speex:c(( 7i fp1 t2fwedkqd about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thexfiek: q wfc1(tp27d( 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.te;6 t 30-6ueb8vnie :gsvr.qmw ef(r
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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 tef) -9vjkd 25xvxm.fa+az ,muhat 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 magnlv*r2 ;x pxpr3i hf08l2ovgm 6etic 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 tht +87og7cym5y mdbua 9wnq b.95bb3 qne east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across y n.539qt 7mb57bwdqgboa8y +n9mbc uthe 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 95jrc 8*zw bawa 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 x5d pv(jf:selyv i9rep96(4itransforms

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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 eachlhk 6azk caule6ug d).awk1n-. nx14( second. The frequency of the .-ac h)aux g(l awke1.1dknz6k 6unl4$emf$ 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 usez1 (r .aubze k3yzrkesy)q5i2j7s:5od 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 devicd:vgrf9( n4s ;va5qo le 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 seco embc7 j5v;*- j+wgsarndary coil contains more loops than the primary coilmjc + r5g-ja 7be;sw*v then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seconrxzwvi r8, dpu1nk/-t3a b,r.dary coil then i,rr,ir d v-n8kx1z3utwb.pa/t is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpun2i ,fyanm.m d39ywi9t

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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 cil ms g0unp/f9j*( s8ske3sb2xrcuit,

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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 t(, +/ gzil/ /qfa1f:o:fw edl.nywz pfo an ideal battery of constant terminal voltage. At the moment contact is:f .,wf(:fz/ zi+ylpd//qewlonga1f 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 connected in series to an6erl5u4hiep (neqfw rur* ,9: ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor isp4ur9 uiqe: ehrl*rn ef( 6w5,

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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 iu,-da: ff,m* hll l)tyl+fa/inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R 1j* ire3oan 3v(kqk uo ,+wq:mis 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.4- :rccb h9 (dygjfqo* The time constant for the cj9-cb4 gqofy crd:(h*ircuit 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 series to a battery. /z : 3fxlg37ai; kznlc-wgy)w The battery is suddenly removed from the cir- 3zf7n:)li g/;3 wkcgxywzl acuit. The time constant for of the circuit represents the time required for the current to decrease to

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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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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sambq2 ee3tw : 2twfjg,8le units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply 2prv5yp0rir -e4p5 o:a9m lwr. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the +8*y6pkn p b. hnsmjr3curren.rypmhsnp jb 6+8n3 *kt

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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 ,ol1h sq;js5v akf;0gchanges by what factor when the frequency is tripledlfs, 5ha j;gk;ov1sq0?

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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 inducti36ot c0h;gf w- a-b *s b)p3j8magfakor is doubled, the inductive reactaaf jhw*)3aabig8 -k p0 ;-3bcogmsf6tnce 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 vo:d) pz i8ktv,oltage across an inductor approaches zero, the inductive reactance diovk),p8 tz: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, th7*3gazs1hiygn ( v4 bpe currentvb(7 shy azin g34g*p1

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor w;h w:c/m sev5chen the frequencv5:cmche s/w;y 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 approac rc(nnvpch4od2q( 1rw +r3q2 bhes zero, the capacitive reoprc2w rd hv br1n((342+qnq cactance 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 angl/8ml1pl 6ygf qe between the voltages of the inductor and capacitor in a RLC series circuitqlm 168flpy/g?

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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 RL06,yotdiuxbn7k1 ) f 6ncmq:oC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inm/6n 02l8p9syz cy n6p 8dhowkcreases if R increases. When is thisk6mcydns80 l 2p/8wh9pn zy6o 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 ukh+u(1g)jrsjz m. m8if $X_L$ 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 circuiuh82pw14m)kqa3zk ludjf7ip;kl j60 t 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 series circuit, ths8q .xr+5q hbfj* rfi)v4n g8oe resonant frequency o q8h84ib)fqs* rgvx.nj+f5o rf 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 reson34vii:r r/t mhr+xz(;pne z w)ance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occur mb.b/a6ppu4n-i jy 9os when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a un 7olu) rjoo (j74zvl5yiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralleo5z u7 )lvjro(y7jlo4l.

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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 2e1syp gb5w b6 ;pwg*s3w(j4m0z wtf-q8o w fu0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and theby46me p 1*8(3- 5bwpgg0tquow wj2 ;fszwfws magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.1gw /w8 x5ujd6lmc-v w0y.k8ud0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whe /cukdwwvm 58jyl.08-xgu6 wdn 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 singled8d5 a ko7qkq l8kp8uz*p;8ku 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 chahn.gd md yskdgs/yp y1. 8:60hka0sd8 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 200 turns of wire on a square frame wit7rm0d ;btmx*uh 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 i 7mxudtrb;*0m n 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 turn4 mb)tc1e+e:a qo .pcis 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 andf b6(k ,lk.hno /wkc.-i-ihvn 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 ho 6ro o +hxzcn 8yxx4gkh9z5j::rizontally at a location where the downward component of the Earth's magneti+ 4zo5kj6hnr 9ohx: :c8xygxzc 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 a constant am z 3c3f:gu)w v4kx1htngular velocity of 2.0 rad/s about a vertical axis through one of its engwv)kuh41x:t3f3 mzcds 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 5yuwk/o0)b (.kr f:uhl0 loops 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 tn h. dkze+.5fp2 gu8dvurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular lo, evi/x4zy8h1qy. cl mops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an ax,/ qcy1 yvizh.48mex lis 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 19fbpba t dku;8 9ckw12k5hv5nxy7n lof 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple(tq7y lzdod dtx 2-) v1xcjn)8 AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fieldoycv8 tqdx d d(z )-l2nxj1t7) 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 a maximum avr0gat/j 9fn0, 2s tx$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The x(c2l7 qcle8y tkb7(qmotor 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 ha(x) fy8: amvfp q+ww r(h1xrk6ve a resistance of 6.00 W. The motor operates on 120 V AC, and when running a phr( + kqyfar:6v) (fm1xwxw8t 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 resist+a-usjo5w 5w5f kkq3jance 6.0 W is connected to a 24-V power supply. The operating current is5qkk55fuw3asw j- oj + 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 resistance 6tm2 mfxi,ek,f i;z8n 8.0 W is connected to a 24-V power supply. The operating current is 1.0 A at ful ;k2fe8zi,f m,nm 8itxl 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 resistance 6.0 W is connected to a 24-V power supply. hqtzw9lk3l0y2 ro y -ds2pza1 5:fu,zThe operzz lqk5o r0yt2w- yf lsz9:1d 2hap3,uating 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;cd7 x cnj vvae/ )8z(n,ab.gi 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 )w:c:iqcfy8oy q89g eoa8 nh/a transformer causes 14 A to flow in the secondary. Howy:ic:n8ao9 8oc8q)ewgqf/ hy many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-llj 0hyolms. +ca(nkcu5cv((*buu+r( i ( rg -V primary if the 24-V secondary has 10ck-o g u i5nla.((lhc (r (csju+y0( rb*+luvm0 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 5dqmtf :qk:0 cbpb7r7 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3m7fpb0rbqqcdk ::7t 5 .0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% 6m a((j6ook eipfj6w:efficiency, how many amps at 24 V can flow in the secondar w:kjfp(( iea666omojy?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thv*57bjym6o4yf wm jm) e primary coil operm)v46bjo m jmfw*y 75yates 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 p y( z)h)gnr7xxrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the hrg(xz)yn ) 7xsecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer ha 9y-1qd mrt/ql01oglf v-,dyn tqm)l6s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedlyy6-dl/o1gn)0 t,qlr -mfq 1t9qmd v 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 seco 6 q3cr0whq.x3s hdnsg3n3.jrndary has 200 turns. If the input currenrgnq.h6jrdw0ssc 3 33 h .nx3qt at the primary is 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 transformer ha: uxsq ii6dns n7*co f72kt*c3s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can exp*q ko23nxfiis:d7uct csn* 67ect 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 transfk j:bbi0 k4h*kormer has 100 turns and its secondary has 200 turns. If 4ijb0bh :k*kkthe power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The4ae hvwfoidr*n23: o; voltage is usually stepped up to 4500 V by a transformer and transmitted thi:hrwfea dn3o;2o v4*rough a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currbp se)uwr2lpe3(1n23 ptty n*ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissi3 2*trsu ( n1npw3bptye)el2p on 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. The ver. i,q1gt, bzoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. tb., i, regz1q 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 harbzr( t/) apsxx0 4-line 50 km long 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 turns ratio of 100:1. What percentage of the origi4(xhbrr)/t z s xa0a-pnal energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 gzu4(eq9gfw*k 8. dgz 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 transforme*z 89kq(ggdweugf4. zr with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1)o)8g8 (vs1luih, g zm3 lzkedv:jpc0000 V. How much less power would be lost if the power were transld):gl,8o(e 1 mu8czhkv v3pi)0jgzsmitted 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 440x. wx v ah-rm9i6a2zo6 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if tha -w o vrz2axi96h6m.xe power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the co toy8h0+ec gk1il's magnetic fg 1 ecktoy+08hield?

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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 con0)cdm rowfo8r5vqzk2 ;i/y. ntains a 6.0-W resistor and an 18-H inductor. What is this c; y.n/ d5)8rv or2zqm0ko iwfcircuit'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 e:hnrbhfcl; q+p7p) ( where the rms 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 s5x*n*6wwt5 mj-qyp*0wuisbAC 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. Wh; b:ftk4orw9 mp/o9ke at is the resistance of the latefm o 9:94pkko /;wrbmp?

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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 srt 4 rs;sv5c+qupply. What is the peak current through the r r;t+rs4v scq5esistor?

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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 hnr:hg)kj (95l ko1o5s r/nk opower dissipated in tj kr/ o1sgnhh ):r5o (9kok5lnhe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisx e8xr54+dj8zd /ng:yd: yewjtor 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 rfg5 ,-gc5ezl/tv mx0zesistor 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- x+sxygsc,5hmi+0ojlex*jn7 8 x:*mzW 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 induc.im28fybtm n 8m /7xtja .f/ bh0a-nmntor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of (o9wj3 pmx hpc3an6aqo3x,j2 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 havem 5k18nf rb8g/a ;gg3xrb yf*y 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 reactancej5xrfozcvga) g-5z 4++old. j 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 w2w1ksg b3gt - z:yha8of 20 kHz is applied to aw-: whgksby3 g8 12tzit?

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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 toc 94;xb;u2f- 4gvkfouge; nc r 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 reactanc(gufhqv)78 mc 4 va8uae of 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 reactance evy.- /4bs owx y+e(5w d0g8vyqyldb;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 o 3jof9so+( mu10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 W jk -3nq 9u/kkspc;,uqjqu/qsk -n c9pu 3;,kk?

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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 throud+fhfh *c 7u-m, l7zzpgh 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 czi0uvmx xesl 05j8o).8t- tpzf .g0jr0wqww,ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitijfgw0xq0xvzlit8. m wjt-p0 ez w0uos8 r.),5 ve 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 coil, 58urj1 b,x- kjto m3kw)4op vpand 1.0-mF cap3oouv84w pj-mrk,j5xpkbt )1 acitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W residp+(o iuzs (*jstor, 20-mH coil, and 1.0-mF capacitor are cd (iujz(s*p+o onnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withx;()-,xwae1yrcqm/ 6t ; q+hkya a kid a 20-mH inductor, what is the impedan )mtcxe; a;1xyqr+(i6ka dyqa-, hwk /ce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wit3 kic d38amhk0+6jf 0utu9di0 0vt8dwg6ddrjh a 20-mH inductor, what is the ph0dg3i dc8kk 09jtwt duudvr0da 06if38+m6j hase angle at 1000 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 coil and 1.0-mF kvz( bv buvu*j;d874 xhv+ 0clcapac0k v+;ulh 8zv*(7 uvdxbcbjv 4itor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neededny mbbm5( vrf(cr1+. c in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 f. br5 +1(ynrv(cc mbmHz?

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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 serie.lx.y oioxq+:s with a 450-mH inductor at 5000 Hz for a total impedance of l.ixoq:o+ .x y40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resx7ym, vx7p7(fvm+t dq istor at 1.0-MHz for a total impedance of 17(q7xxd+pmv ,7ty m vf50 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 seriesig:c()renv + e with a 20-mF capacitor. What is the impedance at 1000 )+eeg (nrc v:iHz?

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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 capaci;msif,m.l k)d:0mv kg tor at 1.0 kHz for a total impedance of 45g;iklmm:, fk. )mds v0 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 1 ;fq,ystvs0,b0-mF capacitor at 1.0 kHz for a phase angle of sb,fs ;q v0y,t$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a totalv.dt a bx0*po1 impedance.o* a0tv 1pdbx 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 capacit7jubf+xq85+( dvslr4m,6 ;vms m cihnor at 120 Hz. What is the phase5rlu8,6hx vnv7j+ msim f q;d4(m+bsc angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at yq vf:d-.9bwsc:ik (w 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in f:w:sc(qb 9ywdv.-i kseries?

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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 consistexb(2i;qxb ,ps of a 100-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.x2,p(qbe;xbi 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 reacta3*zr efy5,g n0ol0oofcgd/ b)wegi/7nce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. We7lz*wg re3, /o0f0bnfd )oc5yo gg/ ihat 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 RLCo6a mlxj)j 0t35bc5oz he415 bdfl +pop5u( wv circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power (bfpmwp 55o6u l4ac1z+htd0 ble oxj5)v35josupply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase an)(hfutw l( quuvz,u+ 3gle of (vh (uqw,ulf z+3u)u t$40^{\circ}$ 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 wh8ctr xn wvdx6m q+r5me e6.:(vat frequency should the circuit be driven in order to have maximum power transferdrr6cx:6wxmm ne +. 8(et v5vqred 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 i* ghwmw;q ht +.8z07tzy xoz0on an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powq;gy7w z8hz0.mzo twt+x* ho0er 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 AC6qy0 x)-4jabydylr :)(wi r hk circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What x 6iqy4d*+qya is the power factaxiqy6+d*q4 yor?

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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 bu)1 3hvp lui176djxccontaining a 50-W resistor, a 10-mF capacitor, and a 0.456)p vbix3jdu17 1 uclh-H inductor, 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 calht6,ty ky,c:j i p6(hpacitor and a 15-mH coil in series?icy p6( hykt,j6:h,lt

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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 iy5 (bv8ofkr 7ln series with a 4.7-mF capacitor for a resonant frequency of 1yl8orv bf 5k(70 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 resonants-o42sp0pj rmk -zay, frequerkp,zas o0j2m-p-sy4 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 /w-x 8h6p l g(wbuynwu/nzb:)in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be g w -hnuwl6n8/by(p:ub) /xzw1000 Hz?

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