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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 exp (a(h xig f,dmn.nw 5jnl0pv.fnh5* 7; jci:ncept

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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 ind3 hx )iq. )mdh:jqqlv2uction 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 prog c)b1t 5ffa;zduces what kind of change on thc5tf;bfa z)1g e 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 magne +n*7n,fzacil/zk2.w7k e sd vtic field through a loop of wire produces what kind of change on the induced *di n+l,efaw nc2k./zz ksv7 7$emf$, 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 ;dx18 b;i wkihproduces what kind of change on the induced;hxi kd;bw 81i $emf$, 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 aizrgu2o1ru 81+*hz( i odc7w 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, the0aucp9v,j c 7:pop5g v direction of an induced current in a conductor will be that which tends to produce which 05aj vup ,v7:cg 9pcpoof 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 f/cx 0zi lkm9lk tzxc-zbw* yt 7,-kw)*lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary mz)0cwx xtlcl*t-my- 9,k b7kzi /*zkwagnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mag pbmsfi,kdq01m u,:w+net is held above its center with its north pole pointing down, and release+ qk0bsuw1,,dp: mfm id. 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 the magnetic field vector poiluncrfuwi zr/ 34(6p: nts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadesplu6 wfuc(: 3r/4inz r?

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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 reqj.h3y i y/2legion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wql y y.2eh3i/jhat 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 table to+s3lt yzs) ms6*bo7c pp in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the iloc6) zpt 3ybs *s+7msnduced 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 carries an ever-i z 71lo00ab69o vairmhncreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. z0ab9l06v 7mo1 a irho When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterin,ycdvyf. v8rp-bn (l 8g first. As the north pole enters the wire, thlfyn-dv b8 8r(cyp,v. e 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 rotydh3 t-dof .5qj) ( ngddvfw8/ated at constant angular speed about an axis whose directiono3ddyfdhd .8fj- wt( 5gv) q/n 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 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 ttfbyr)n4 m0hd y:un dp5r*;0rotated at constant 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 l4rd;ynur0p*n m)05d by:tfthoop'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.8zkqiur * ca7jlm516xhg x 69p
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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 +)ryxp0gx24qq5vj a f$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The qvhxzzgfdy-6 y(j)*805cmx 3 9 bqvip $emf$ 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 moved northwa 6sre;v5y fp sip7c:o)*u utj5rd at constant veloci sc*rp jvty:e5o;p5)s6u uf7 ity through 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 (h t-)2sfuec zconstant 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 transform k*n0mgu -p7sas

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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 eachxs3l1i gje5z6:j4 zeq second. The frequency of theieejg6s31:5jlzq4 z x $emf$ 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 devij*s pj)w.y6u *ttop5dce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thae pzo23wsg l75t

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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 t kpz -6ld lqa62u:4oxrhe secondary coil contains more loops than the primary coil then o6-az:q6x 4pkd ll2ru 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 secondary coiem1g2q6ka: 5 g7p f1pchlf6thl c g:t752 mhp161af 6 hqpfeklgthen 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, the powerer08h6 v1k/g qkc6ki9.i mhv r 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 cirm*p :e ubf7ee(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 connected in series to an idear 58lxv1bl8 amvs2a6uh3 z-fkl battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistz6 l-l 8vr12amkfas58uvx3b hor 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 2cpk muy*:/cgh82ynzh- yve *battery of constant terminal voltage. At u*p :g 2yhmyhkzyn/ v-*8c2 cethe moment contact is made 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 ind yqsww6 a-g(0fpy* ot4uctance 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 mg6ft -fgh(v qcv e3q8)r106tyg ic *xR 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 ob9 /+kfw6* orzanre- y6z ts-in series to a battery. The time consta-yn z woa6/r-bs+9*t 6okzef rnt for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductk3jv:yxm: tc 5a.h *cuor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of t. tjh3c*:kxu5 a mv:cyhe circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following ha*(ck ni-4.n z dwvm+za7jz wzi1f, s wyvx46o1ve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to :. z82notjkxu38jf3va id 13 uik2y mpan AC 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 circuiixs 1nx6l 62rjt, the curren12ix jl6ns6xrt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the freqahpjrj0 an)f gyt-4w d 284bo4uency is trgtw4jj8 ypr 4 4afadhob-n2) 0ipled?

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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 voe/b xxs v:*7biltage across an inductor is doubled, the inductive rebs x/e xb:i7v*actance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approac,q;7 ( fjiwduwhes zero, the inductive reactance ; ufqj dw(iw7,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 suwemm4;4f7 q azy+s ,vcpply. In this circuit, the currem 7v4 +am4;,qcsyfezwnt

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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 0dvnu/zd 6a (.8ub nrmcircuit changes by what factor when the frequency is trip( nmud.un 8v0d/b raz6led?

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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 u+pum, nz1n4 oAC voltage across a capacitor approaches zero, the capacitiv, uou4pzmnn+1e 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 betwejh7 no4meae5, en the voltages of the inductor and capacitor in a RLC series ciro, m47eahnj e5cuit?

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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 RLCvfz wnf 4/3:ki 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 inc cdtopt4 ;w )okfjfwn:j50r25reases if R increases. When is thitw f4 2 otjwdf50:)cok5r;pjns 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 circu4d.p.643 kx0qk 8avcdp l qnktit. The impedance 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 circ:lhs /j ds57iiuit 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 capacitances30 wa 8umid).qy* h* x2gseybw.lqo ) both double in an LRC series circuit, the resonant frequency of tymwi *) g38.ayb* s2xlqh o0euq.d)swhat 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(1 x/ j,9xg r *tcsrzg;qkkn:n resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cbh j0i b(lf)*uircuit 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 magnetic fien2h*yow3mqj9a 4ete vu4e yk m.(:ip 6ld of 0.20 T. Find the magnetic flux through the loop w6njymav3*h eke24pq4.mi o9 et(u:yw hen 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 radiusqp *e44+x qzw )jxv-si 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane + zx4v isp)-ew 4jx*qqof the loop and the 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 0.10ejz v 9:2b5c ytp9gn-r m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughn5b9ev9 2p zr tjy:-cg the loop when 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 is reduced fr1jb;mw r t34,mvriq6qom $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes id)t inw*z9(.kku(c,b 1h2d;khwn zrfrom $4.0 \times 10^{-5} \; Wb$ 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 6 g45uaol +2hif6auzr;avy/tturns 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 touv 2f6zga4tia;+ylu6ao r h/5 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 w 0ndbkr2behii75* c6r0*px ahith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areep78s+qnqjn0uy cew0 2c7*o ka $0.20 \; m^{2}$ 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 kwb-:ipy jaoxzi qov1746y.- span of 60 m flies horizontally at a location where the downward component ofi1i aj z:p.yvqoy7 xk6-b-w4 o 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 a constant angulaaxvgw *u: /fqs1h70ammhh +1dr velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetichxqa/ fh1*d0ag+m:wm sh v1u7 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 cross-sectional fxyi4+6c 6s zearea 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 consis v0od:lj;cleoe -1u,wts of 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 $emf$.

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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 12xm m/ 0b3q1cyi cm long and 8 cm wide. The armature rotates at 1200 rpm ab/mqm 1y3ixb0 cout an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 ttx9 xg)rrp55lurns 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 cons86 /,cr d8 o pqfx.16.9)ncinruc 3hoycqwdddtruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avai rdnd6q yfwo6nd/c q)h9cdc,3io81.8.rpx uc lable. 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 dd3/ jia ,g9(fctht/xgenerator with 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 r)vaask:1/+ozej .klx6f)euz p:uid /esistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor h n 784vp.rna4 *tvzxre5va fjn4)- pzhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full snrz44 jpv vxt8afen5v*ra)n-hp 7 .z 4peed 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 resistance39 jl)guhnfjd b/;en*/nb mu7 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uldn9njf/7h b)ge ; n3um/*bj 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 connected to a 24-V power supplyl8d8u3baez5 i2 gqwe f; .o2nj. The operan;q2 ai 2ogd8e8 3 eul.jf5bzwting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rw2c. e rbf3j1xesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the w1jrb xfce.23 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 primhdbmg,: e 7e5vch t-:hary 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 primary5o kt 1cr+r*e9e)pg me:0przu of a transformer causes 14 A to flow in the secondary. +rk):euppz tom 91r e*e5r0cg How 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 m +q/dlbzdi /s.any turns are necessary in a 110-V primary if the 24-V secondary has 100 biq d/d+./slz 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 500-turn primary coilg 8wci f+zip3:a;y7bafj1me- and a 2000-turn secondary coil. If the currenti i1b f+wzc;:g37 aepafj-ym 8 in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the ppid mgk;lmu +4 lm(rmk;-sgy7*zn8 b8 rimary of a transformer. Assuming 100% efficiency, how many amps at * my47 mpb8glg+-k(m8rz ns;u l;dkim24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer proviy0sn )bz 3.i* kiisa9ndes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drs kin) 3*bni09 .zaysiaw?

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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 primary coil and 300 turns on its se/ en+syb vux(2condary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconnxsb/eu ( v2y+dary?

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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 secofoo 1qvu2 dt),kd4(*gr r pq5yndary coil. If 120 V at 2.0 A is applied to the prim52d ftro, p *)kq(vqrduy 4go1ary, 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 ioi p77vq0 )vte+ qef*fts secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cq7 vtei7 o)0+ vffeq*purrent 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 s * j9fhhj)95oz n7qfrgecondary has 200 turns. If the input voltage to the primary is 100 V, w*goqfj7fr5z9n h )9jhe can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnspyu3k-c z(qd( k)atw8x sv:p 4 and its secondary has 200 turns. If the power input to the primary is 100 W, we wz:pkkxq yt( vd3-a( u8p4c)scan 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. /m7 4f wub ytd:ea,a6gThe 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 number of turns in the seconbw4:yft,g ae/da m7u 6dary 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*xa j )qxdxua ;t9 -56kcut2vc current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perxu5cxj9;ua 6 2 )-txct d*akqvcentage 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 currehura79g/uen.8fak(7k2c sx ih:e0 tj-z mi* z nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a ph7nem2- acg9iu87e .kazrx : /z t*0ijuksf(hower 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 resistp3ys pb6unv;kze-a 16ance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatib np ku;yvz1-p3s6a6eng of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total. yf3v a x0v mnp;do:)im7 ee-c0vwth1 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy:e7;t m 0 c)o x3fvyhi- vd0avmw1npe. 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. Ho,z28h,szj/(p)v qeirqp(6 x4 qfehaxw much less power would be lost if the powx /,fe6( sqp( aq4phi ezzj8,)r qvhx2er were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a gene mnbt12h:1 vlvrator is 440 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 betm21vb :1nvlh 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 thi./ u9eqw)o1hvl:qn2:f m qs pe coil'svlw: pm.1 9s:eu2nfh/ oqq)qi magnetic 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 18-H inductor. W37+mbrkx ye5su h ;w4phat is this circuit'b4w ;er p+uxm7ysk53 hs 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 wheri n 8l:e2wias)e 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 AC ouqkqp7)5d+dse6n - b zwtlet. 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. What is the resistatcw6 h- n7bt+ance of the lamp?b-7t+want h6c

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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 thj0/c/lhr8axb7t ((qumkz 1 -x2ivmahe peak current through the resistor?/c8u xvtqhmm7x- kah0l/rijaz((b1 2

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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. Wh57hnjdv mb: qp3csk. h4 3mu-nat is the power dissipated in the rn 3qdjn73. u5k -4mhh:pcbv msesistor?

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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 res2l*ifu9j; ed y1yd1en8 gaa7j istor 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 b+* sa;tu4 +e9 injoefa 50-W 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-W resistor2e 7ntsyd 11nj is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at cce:x(jwbq7*d(kjg ap:-l . w60 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 2.50-mH coil j hex.7a:( mfmqs/,nsdct7r4at 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 have 14.0 W ofn3/icg 5z 1mv( fp,i8gc6pi(1 iiwrnb 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 iejicql 8 slw1wq 5 3,q)qsy;b3nductive 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 intsmx2.)uhw11 j-hn3 zol d3o ce5v+dd a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied 53zvdoc1xmjt.3- d+2u dshhw)no 1el 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 111kvf 6p*eb x(k0-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 ofyymj,kc7 j/wmb0 kq7 ; 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 nldao s73i(+d0yz ( lmcapacitive 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 capac9 n/zi.vn (-ambf,hzx1vht -kitor 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 x1 yofw0i+fii(m0 qg6the capacitive reactance of a 0.010-mF capacitor be 100 W? iw60 xiq1gfyf+(omi0

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0. 5yyl+ko 2h- usym90jk0010-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 j.(1byf6nmu vjb f9 ut+v/.z nseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.01 /6nv ub bftu+n9v.zf.j( mjy W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH );qtejo0q b i;e5ho+u coil, and 1.0-mF capace0;qbjequoi o5;th)+itor 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 resist-+ h-3fulaglxagru5u*(h p)c l3m3vkor, 20-mH coil, and 1.0-mF capacitor are connect- lpa+gua (5x3ugh*kmu lv3fl 3hr)c- ed 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 if(x+(cwl0f+pfjsq4oy.bktl) o/ 3d in series with a 20-mH inductor, what is the impfwo +yis 0lfc3/(kj )opd.(fbx4ql +tedance 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 w 5 .ap82ztp:uzidzy ro+l19ydith a 20-mH inductor, what is the phase angle at 100.y9z puzaz 1dlp:825i +rtody0 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 withrzs 5ysf8r01w a 20-mH coil and 1.0-mF capacitor for a sy5r wf1 zs80rtotal 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 (/ v ih2 yz,tszdf0f.win series with a 100-W resistor and 15-mH coil to get a totz 0fh(f,/zsty i2wdv.al 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 at 5000lv4) f2hd prjqn t2fx* su2-hex zw*+3 Hz for a total impedance of 40000q 2)nwzl -2r* 24e 3xvj+fhtux*dsh pf 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 resistor at 1.0-MHz 3yv/c 1/hg lbifor a total impedayc1v l3b/hig/nce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-gox dmv6iai:iutn8 ,(;nwp rt: ( y3(jmF capacitor. What is the impedance at 1000 6t;:u:3ny,ado tw prv iijxgni(m(8( 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 wn/3 +kdjml w09ho8u eseries with a 10-mF capacitor at 1.0 kHz for a totalk mwul/ don3wh+e09j 8 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 capacbtfgm4-tok j:cd:)6y-9 h hx witor at 1.0 kHz for a phase)yg9dwx hf t:t6mobc4jk h--: angle 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 resimy ,b- 3k)ud .rys9;ng 0xkinnstor at 1.0 kHz for a total impedanc.,k0 sr mbdu g9;-nxki3 y)nnye 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 seribstj*t-3:xs2qvxy 7 hes with a 100-mF capacitor at 120 Hz. What is the phassxhtbtvs*- x:2yqj73e 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 5.0 V and 15jv m6on6y r20yemt(n8ybq1 (x 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito 286n n0 ojre1(b(mqmx6y tyvyr 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 circuitte *h),fw vs6y consists 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. What is the rms *,sf)ytw6 ev hcurrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 Wdjx kf)62g5m /id8stp , and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in2pg8xif 6/j ktds) d5m this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50- lk3pd caj .l :.;2obv0q5fqeoW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60kl a;o5efoj:v 2lpq0dc. 3.qb-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for z,n+ v)aj8kzaoi p 7+ba phase angle ofn 87k+z)ibaz aopv+j, $40^{\circ}$ 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 = 798 x 1xd5sydgwmki 8l10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred frk8 dxi5w971glydx s8m om the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circu+vcvvr4hjtaem;0(j t*z p/ g;it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive retc aj/*rvm(te ;+4 ;pjvh gvz0actance, 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 isbxrv dj.tm i b(6p91ikz*a 0o +zpjc7) $63^{\circ}$. 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 wen5+,hgs;8z* yfoyg zvxr*. of 30 W. What is the power *yz, sfn. z*hr+ 8xw;v5 yggoefactor?

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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 circu4iqt 6ghycnip-28 ez, it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H i6 i24z ti-gqn,y e8phcnductor, 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 capacitor lmt nkz ;q5+u5kax-,y and a 15-mH coil in series?q-k;a 5+ztmx5 ,unylk

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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 d z, sk+jm)tzti.f os(- 0c2;a7cmd pxfor a resonant frequency ofi0z-paj(c+fmd. ,oscm ;k2x7ztd st ) 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 inductor for a resom;7v, mf7kpr;wnw0 h unant frequency f,0nkmrv;u wmwh7p 7; 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 pl hhj:bc (du59qo br4s3aced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuituorh(j39: qsbb 4dc5 h is to be 1000 Hz?

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