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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 magnetq*dhv3)h fk0tt ;sr1oic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductiesyhd nm (gq l)40fo9)on states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil w4zvgtu vgfj :zbq2j ,1*w/n7 produces what kind of change on the induced/,z b4:uqnfj 17w jt g*wgz2vv $emf$, 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 mag pr/jim4n65u2k.qds,yi mz9vnetic field through a loop of wire produces what kind of chan/9 ysi.ui mm4 dqr,56j2kpvznge on the induced $emf$, assuming all other factors remain constant?

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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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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter olpc2e )uc0l d0-gliz bi,+ zq9f a loop of wire produces what kind of change on the inducedzc li z 20ep-u)0,ib+gqc ll9d $emf$, 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 fro .t:skl) b60j*ysc unim 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 and83b / txbdcnpec21ef 2(n5 jb induced current in a conductor will be that which tends to produce which of the follow2dtbebxbcc5f8e n 3(j1pnd 2/ing 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 ip0s / unl1:-xdr s-2iuazzvt,s held above its center with its north pole pointing down. The stationary magnet induces (10-r,z an/l d2vut-z ixus:spwhen 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 horizontal t9an(fy srdr+4 able. A bar magnet is held above its center with its north pole poia+9s4nr fd yr(nting down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where -/sh lnw9bjicn*(oe4 the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducedi 49jwl(ncb nhs/*o-e current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a y (*b+ f1+voilaxwxc0 level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the d1c( il+fw yox+xba*0virection of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a /5my()dt6v yw0v8ldk ( thacfregion where the magnetic field points straight down. The magnetic field disapf (0 t)/vdw5adhlv8(m cty6kypears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire liesy ox+2r6t2 iun on a horizontal 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, the ind6ox2i tn2y u+ruced 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 wiivqr vjgta63smg)3 sg 7c9(d 0d *cm3tre with the north pole entering first. As the north pole enters the wire, )m3acjt(d9vrcmgv *7 36 sgi3tg ds0qthe induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about abp(hv4gq x * +avucj1,n axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation o vh cx4(1gbau,vjqp*+ f 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 an3pdgylc;t8 ar ywji8 6u-p*7y3pka/u 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 ro8ry3ug *dpjla/8-p 7uyt3aywkpi 6 ;ctation 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.2hry1)k1:bz x9goy h.wch sr /
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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 ;-*.q,xq,mcuj *h fjoukkev, s5ebw)that 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 magne(mal u7pft os *6cb)f2.3jdd yfx ;.lutic 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 direction) is movedf5bcf;h(4e uke:l t7f northward at constant velocity throu ; ft47(cbuelef 5hkf:gh a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constanu /uitl 4q6:rrpc) 9cht 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 zs *va jd,2m7b( ;nv3 9hbnwaitransforms

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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 66f(yiy v1nk7j .kg 5vrbl1eo,0 revolutions each second. The frequency of thekjb o1ik5lyvy1 f7 r6ge (v,.n $emf$ 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 usedhup0gq g5 * zinp-7d1w 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 de8 h)o ycv8p cje -la59t mjq/za3i,yf5vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than theyz vbgmn xn5h71+,l.j 9f4mq q(a9zje primary coil then ,1z.qjqlnvf 5y 9 nmxha9( 7j zgmb4e+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 prima,q*f)j0r qnpk ry coil contains more loops than the secondary coil then0jn*p r)q, kqf 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, tho+kib0 ove2 c(e 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 c)kg* ndu 2a9-lq o1wcmyszg. 2eb/ +vrircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to d2 m o+7,xqhfvan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagd+72m q hof,vxe 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 a 0fhnl.znh zvp4,*v1 0 wej7tyre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made withyln4vn,tz zw17h*0 p.vf0e jh 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 withb346o ;jcpj ud 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 is connected to an mz *urcli87g: 4gen 2m$emf$. 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. The time consdrr6 g5m/k2j ptant for the circu g6p5/ j2rdmrkit 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 jg vqu*-ff,nnd(d;d,*3qr rcbattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrec*dqfn*dfdgr-q3(,vu ,j r n ;ase 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 unitppzt8k/kk6v+:v (o+me ig-x hs 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 t. m; : nc,f,:cxti cxjs/nin;bus )tv,hu/k3AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, th t; ,fxlf-6nvie currentfxitn, l;-f6 v

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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*pwexi 5 dhv8 h16sjga8. (mnv what factor when the frequency is trw 8gjxv15 va(s*.6dnhphm i 8eipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductive g(jhr3--d9t txjr9 ejreactance of that inej-gj x j3tth-9d9rr( ductor

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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 acnl3po8 dwg +uev85f+ hross an inductor approaches zero, the inductive reactfh +5de+3g v8uonplw 8ance 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 tozw.42 :izel or an AC power supply. In this circuit, the current:.ilz4 ro 2zwe

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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 circuitqq5klp2htb* fgcd 444g7elq) changes by what factor when the frequency islg44g7tek hlqqb pqfc*4 d5)2 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 twdx5t 7)(5kobr6uayuhe AC voltage across a capacitor approaches zero, the capacitive reactance of that capa(xr6ka u5dwbuo 5 y7)tcitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor an3)jrp uvu t+2alm12gncfi* t;ri+ ld7d capacitor in a RLC seri mcfi27vpjg+1t+d r;uain 2rt*l3l u)es 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 4 5 vl/xw7-4a8kt0yby 9 x6vamulzeaj 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 R il3 4swlq10mpf on65mnncreases. When is thif oqln 05s3m4nl16mp ws 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 x biy w(i12rtttz(p/f)sm 10-m p8 waiimpedance 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 of the circuit increaf03uoy7i no sf9oot 44ses 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 sf6f 4:7f 5am ptomj;jxeries circuit, the resonant frequency of that circuit wf :afjp;t m 576j4fmoxill

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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 i ;svd ;mr.tjyk4nk kho9,4yq. fy:p5+*xapops driven by an AC applied 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 seriesjw5:c6( q cwwb/ c6cst 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 m is rotating in a uniform magneti ua9e55-oucpec field of 0.20 T. Find the a- ope5ceu 5u9magnetic 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 rade/ hia,2kht/y ius 0.10 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 2/h eik y/h,atthe 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 7sq4;0y aeo4 upt8oer.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plae804opre uys;a4t7qo ne 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 a7u8h dkhr2/s 3etp j2adjustable 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 vocdwdfp7,kc,*; c*y. fati 35 nlio:changes 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 witv:gf ):e: nygkh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the )ef :kg:ygvn: 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 wg5ac+ .7)pkh,ptu)o0h golsan 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 ac/oqp 2cg* 4xrt4f* qnrea $0.20 \; m^{2}$ 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 h88dw*v)(ct2azh dovx phwm:0orizontally at a location where the downward component o)ch tv2z w pho(d 8a:*0mxwdv8f 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 l5kf4 9u,-gn o91wk qq*fszgykong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one5 fg 4,*ok 1q-gusn9wqy9kk fz 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 aukz sp 29h/shhz-5o *h 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 oda7+ zoj)y9c sx9aza 9f wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatuinsh 2t od6f zxf3(l8-re. 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 uniform magnetic field of 0.30 T, which is perpendicular to the axis oftf 3-lhifd osn6x(z82 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 100p6( l*q xugd5c 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 con+rbpm j1a we/u/i q75qstruct a simple AC generator with an output of 12 V maximum when rotatm7+q1wpibj/re 5 qua /ed 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 a maximum auiwjxpo(: 9urq f 9*us kh7t29b5 ;ut$emf$ 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 1k c) bkaz:1z82aj t2iid v3efmotor 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 b (5fupdu.n *qhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a back p5 uqd*bf.(un$emf$ 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 idyq(2u7 lb :n24-V power supply. The operatingb id72:uyqln( 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 resistance 6.0 W is connecb2o fyf,li7q71 kj sq6ted to a 24-V power supply. The operating curr7qjq7iys, 6f k olb1f2ent 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 r(r. u4jo -mt8rqglpi d,i9y 9uesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back ,9pm-r9 l .i(8tdo4gryjuuiq $emf$ 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 pl8i p6bh i:8hurimary 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 primaryvtruqlzq2y qj ,90*+g yrcz 38 of a transformer causes 14 A to flow in the secondary. How many turnsg 3zq ly*v28ucq ,tj90+qryzr 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-q hyun37s*3 eg :4qhkwld)un6V primary if the 24-V secon): u6u*hgq 4 hqs3yewdn lk37ndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists 9 dht:sjchy*s6 7,f aiof a 500-turn primary coil and a 2000-turn secondary coil. If the currens6ic,hh jy*7sfa:9 tdt 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 tho-.p 5hj aerq b8b65x3qae1 ufe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V q hjr.f ep85e5-ubo6 3x1qb aacan 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 of a neon sign transformer provides 7500 V at 10.0 mA. c4pju; t xmjs+2osq. /xv(ni8 The primary coil operates on 120 V. What does the primary drav; m8cpj (s.x/2snqo t xij4+uw?

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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 tkstml543uyr l 0y9 8dqurns on its primary 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 secondasqmkd y y l854lutr039ry?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secoj:au hdmh tk:538q5h- dbgi )dnd3::duahbmt 8kijhq -55h )dgd ary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a0+ju6d rf65n c d/mowwnd its secondary has 200 turns. If the im/ondu j6d wcw+r0f65nput current 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 has 100 turns and its seco+x bbxo1 -t(br.vpvm1 ndary has 200 turns. If the input voltage to the primary is 100 V, we can expect the oubm(. vpb -+1 brxxv1totput 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 transfs3xmz(eo) oy6;m44g bg e cyp4ormer has 100 turns and its secondary has 200 turns. If the power input to the p)oomgxyg se3e;4p m 6b4(z 4cyrimary 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 curren uo:6 yr6dm9*b;f dmqnt 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 n6* rnd;dm:qyb o69mu fumber 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 step6 9ckw,wvvi ax20o *pjped up jkivav w ,wo*2 69cx0pto 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.

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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 y1d/o 7f,;me p+lfjhu 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 transm l,j7ompfuhdf1 ;ey+/ ission 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.-s( vvk ct0l:g60 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 transformegsc(0-:l vv ktr 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 resistance of 0.60 pr1 0gmyaam mc*6 1u74wjdm+vW. A generator produces 100 V at 7rvmgmw du pjm1 a+y0m1a6*c7 40 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 used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be 1c*gh3q+0r7 qzt(vkp mw m 6eclost if the power were transmittedhm z q+ccg(pwr03m ke 17*tqv6 at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is bjp xdfb3+ :-qto be transmitted on a line with resistance of 0.60 W. b-3q+d xp:f jb To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coitn)/4s2wri on5skx9n l's magnk2issw/9n)5 otn nxr 4etic 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 resistor and an sgc:8wh(wb5m 18-H inductor. What is this cir ( 58b:mgswhcwcuit'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 td/ al 8ism:(ghgc xp49he 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 AC outlet. What is the peak *bl;ycpegs: 3 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. What is the resistance of the8ovntkx ,/4t6xr hi5c,ckc0 e la8ccxk,0oi h6t/n5ev4rt xk c, mp?

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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 p. /,bww ;kpzf64ke6a7x wsx xoeak current 6a, pexzwwxkb;7sox6kw4./ fthrough 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 supcz6io*4y x:sm : (cgeyply. What is the power dissipated in the reg:mx6(os4c iy:*e cyz sistor?

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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 g(fs5-u+v kkf (r:kg1 .kmll cresistor 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 resis,);d ( 54ns dcrh zpgpbe)rid;tor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist(/axwf rh(aj u.i2xi) or 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 3p2a bqg q)06p7pwj*ljieqq9of a 1.0-mH inductor 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 a 2.f(nertadmj tu)/33a k j.1d:a 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-m 4akbdf) 3s3baH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance au- lb1n,z xd:et 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 attox1yvu3c9bl gz) 4q- a frequency of 20 kHz is applie-zto 1yq)4bl9v3gc x ud 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 Hz source+/a5 lp dd9rbqpy4 )rf?

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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. :dyzhnlu*. +t4myui65(j4oe -9psucenxd;y7-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 zky yag rw)73ez5 0zzxnx*4k; have 50 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 12r 4/p jx5b3.a:wb;jz j vh+hkd00 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 capacit6j*kvi1 rfa *b s,n.eaive reactance of a 0.010-mF capacitor be 100 W?b1 ksj*eiafv a,.*6rn

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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 1g xz07 zyh9 1scetzd(-o nd/k0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W .eh8uw 8gl+9hgo) e ffn *qp5ninductive8he 5n 9f .n gu)wqlhfp*+ge8o 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 impeda /69v;os*jzbhkkp9biv j ;9aance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF zv99ia phj; sb*o/ak 9kv;jb 6capacitor 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 ve66 h(j zqe7d6rr0g6+ lpsy qresistor, 20-mH coil, and 1.0-mF capacitor are connec q (y+r6lvez e76hj0sp6qdrg6ted 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 wli ((nc5k9xqp ith a 20-mH inductor, what is the impedance at 1000 Hz?pcqn i(l 5k9x(

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is x. ivcs,kkwat1gg. /qeev092e9 8 yaythe phase angle at 1000 Hz?g1vgk0 tas,e9ya8.e9 .q xycie2k v/w

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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 p/v6a 0po ze h98gbt77h-g hfck)0yew.0-mF capacitor for a total ba/ -pkozf0 8hgwetcg6h )e h7y90p7v 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 seriesvn+(v3 f6bo.gb ,quy g with a 100-W resistor and 3g+gvn q,b.yu6v f bo(15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH ir*,vxm 2b 1 8fg)jjtaqnductor at 5000 Hz for a total impedance of 40000)8xjtq* mr vbjg 2a1,f 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 seril(*e/jv t x5z; zgm b-22runples with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?v m*-l b j(xu5rgpel;zzt/ 2n2

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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 capacxf8a8 9oa ndniag3iy7w8+i9c itor. What is the impedan9 + iaan8niy97oig d8a38cxwfce 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 serie5z okm)2j nqd2zzu+3aex 1d)ys with a 10-mF capacitor at 1.0 kHz for a totak u2y+dj)3z qnad)z1xe 25ozm l impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor a1(cdg lbu2zt,t 1.0 kHz for a phase angle dzc2t(,bgu1l of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz fo eksqq 0l8 +efh-ql:nevs-3/f r a total impedance of 45h8nf-e3 lqqs vesqk0 f+-e/l : 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 egna*ojd3vswui5 g: (0/lyaj x6uy3 -at 120 Hz. What is the phase angl/:wg uguy*dla3 veos 3x6ijj05nay-(e?

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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 1t.(lfvc4 8u,sd dzq p7500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor p(7 ,lusd4c 8df. tzvqare 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 resistor, a 10.0-mF capacitor, al6mac- 2w osr7jl)jg0nd a 0.350-H inductor. The circ)c0rsgl a-jm 6jlw72ouit is connected 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 reactancgf .e,9 3dr x9zoy1hzye 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz 3yrde99xyf. zhoz,g1power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 5bhdjbwah6h 44/, z-uycq5ks /0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supksba6q4 u zbwhj/5,/c-yh h4d ply?

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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 p)/upltnbysc8)q- 5 3 wymo*i in series with a 500-W resistor for a phase angle ofcosp)qt 8lwu3pm)- n y b5/yi* $40^{\circ}$ 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 frexqc icp95 0r(.,gipvfyim b7.quency should the circuit be driven in order to have maximum power transferred from the driving sourcefmg0 x, ryp 7 ii.9bcv.c(q5ip?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15i- 94nyb fh6e (6kvtkr.0 W inductive reactance, and 10.0 W capacitive reactancv6i4n r(yfhb -9ktk6e e, 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 ACup1epw5b jj1z; xkq8*kbq (bnc(to., 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 circuitle ml-l7wl, /.mv*n9tkno z *t has an impedance of 60 W and a resistance of 30 W. What is l*tkmv9-zontn7m l.l /,*l ewthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containin .4-zf0-xwt jbiw nv4w3 koju,g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweron.x3i, zk--w4v w4t uj0fwbj 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-mF3gn+z8 dmn0te capacitor and a 15-mH coil in series?8n0 dzgm3 en+t

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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 s usp* gob)m17meries with a 4.7-mF capacitor for a resonant frequency of 10 kHz?1g)bo mmu s7p*

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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 bra cp06x y0x:3p5 ctn3.7-mH inductor for a resonant frequency of r0c3np6cbxay5tp :0x 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 pb3a f+:kh)ayqlaced in series with a 30-W resistor and a 40-mH coil if the resonant h) + :fqab3akyfrequency of the circuit is to be 1000 Hz?

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