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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 exc)rcy.dk 2v2qt ept

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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 tha+pnese xk;y31*k r2 ;dza9pget 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 wirexfr2+ *s;a t3pxy(j up in a coil produces what kind of change on the x u *(f+tp2a xpy;j3rsinduced $emf$, 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 field through a loop of wire produces whatrpr2xk-nu/ (j .:2sqy3grn ws kind of cx2 rsg(2u n/n prs jy:kwq-3r.hange 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 of a lool7m,.ws;jy f fnt7er6 p of wire produces what kind of change on the induced w;try7 6.7enm fsflj,$emf$, 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 fie 0 g9fnerw/b9/qz1us tld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducednqh)5;: ,bwro k5cjpd current in a conductor will be that ,j:qnkd5p5)hocw ; rbwhich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab3s(jw ur3 u+l9.bco*f h 18w2 kbtkzxnove its center with its north pole pointing down. The st.wxous9(t3 k2zf8b+r 13kj uwch* n lbationary magnet 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 ongy.k,tm+ vts3r 386dh1tvi*ps7x kbar magnet is held above its center with its north pole pointing down, and released. As it8.iho kv pxm3tksd+yt* sn,g r6t 713v 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 tabley(kcmeka(sdf49 v/:u . c)ft 1o9osp+nng; i n top in a region where the magnetic field vector points straight up. Thes;a fcdtu9ms/+k 4n(.v(eco) fgnonik: yp19 magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced 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 level table top in a region where the mag*5( )p2qn kklepara l,netic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fronapk,2kl*r5p () ela qm 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 t q7mool. 2yg;iable top 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 induced current in this coil as the field ;2o7o giml.y qdisappears?

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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-increasin/c*, (ofij.4n2my1r o7 n.x t gdqib*;aj bhdhg current northward. Two coils of wire lie flat on the table, one on4bn1oyti *xmdqo .*rb7/g,dhf2njh .;j i ca( either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole eclmrc;: 4jv + c.kio-zntering first. As the north pz o; vlric: ckcj+-.m4ole 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 constant angular s+w;l/f. +k k/ qdaski7qk7glfpeed 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 rotqq;7w/gfl/ ka+. +ikl sk7kdfation 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 h4c +wb2tsu a/about an axis whose direction can be varied. In sw+h atu 4/c2ba 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 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.u si/yb7.z:ebd q;8 xi
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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 th g ys3 6snzj2 zibx31zs922kssat 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 magnetic field. okvy agbxpwb3dd1u 3 )1x-/h9 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 (oriente93o:s -sk(2fge dfv+g,zjb v.to7jzed in the east-west direction) is moved northward at constant velocity through a magnetic field that points ov29efj +gts7 .jv kf,zd obe-:z3(sgstraight 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 constant ayfq11eh:p 6iv ngular 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 transfoeymw9osrud5n(x,d(6 +s0*q wm w. tftrms

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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 e ocucm17 :ey:v6vu s,dach second. The frequency of tv7cvy,uce : smuo61d:he $emf$ 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 use,bt gx5qr 9fwuow89t.d 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 dk3lv emub h1 k9 d,1chof01oz;evice 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*. n saghu;u o5t, 7futp*.wvt the secondary coil contains more loops than the primary coil then it it ;.v,g5 7* utnhouwp*fust.as 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 conte+ecl.zryn 38ains more loops than the secondary coil then it i8r.e3y ln+eczs 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 w+sou ) +gyynr2 i,f*wpower 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 circutw)l( jba0bp )it,

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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 inducto u/paifzno :a5b87p0gr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resis: gf5au8 7pnazpobi0 /tor 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 2d4tthb i19eh iy0 vu/wl48.sebv*apin series to an ideal battery of constant terminal voltage. At the moment contact is made withet0uativwi42l pdhb1 v*s9y / .eh8 b4 the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L a;:vyw(m:m hd3lha :a fnd 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 resistancefm, ph :/yiv*n R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time consp8i 1c 5y2()lan* cejsf(kexet(eeaf*l )8n se( x5 jkpy1ci2cant 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 inductor are connected in series to a battery. The batteryh 6ka gpkp+he0 d:p6ovktyvc36, 8j8u is suddenly removed from the circuit. The time constant for of the circuit represents the time required fahy kk66c:pop keju,+ g0 dvp3th8v68or 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 s 95);oq kdrcdr5u5 q7qyi9x v.w- jqghave 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 an AC power supply. On this cir 6; auza15gwcg wwmq:w-80k zbcuit, 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 A8s 22qvpgar;6 v7thz bkdd 1ru/ydj80C power supply. In this circuit, the current 7;hdz1qs86r0b 8dvavtyrpj/ug 2 kd2

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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 circui, 6 pgi 9j tz8xtmy5q4r/v,xqtt changes by what factor when the frequency is trimq8xp,yz 6 qx5r/jvt g94it,tpled?

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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 g*)5dkhoduj-ye m0vff ;9jv * an inductor is doubled, the inductive reactance of that inductoro g;ef*d vj50*)kmfh- vud9jy

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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 awezvo*,w8* g+sj3 ng dn inductor approaches zero, the inductive reactance of wzvn 8sdjeo *g3w*+ ,gthat 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 connecctb1*g7 e. tnlted to an AC power supply. In this circuit, the currenbet glc*7.t 1nt

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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 change9no-e4 ym8za fahalxm(4 +cic7 h1y;w s by what factor when the frequency is tro a8mahy-(cai;74ewzfc hn my9+1l x4ipled?

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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 voltag. rthbq.,3yq ue across a capacitor approaches zero, the capacitive reactanchyu.qq, tr3. be of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a 3x3p ku. opk/zRLC series cp.3 kupzk3xo /ircuit?

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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 /t9vddarzz/)vx ;a *adefined 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 hy21 4:cm*pngs0 si 5nf akw/xR increases. When is this statement 1k 2pyi 54s0:xh c*/nna sgmfwtrue?

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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 incremf*36d n zh.ouases 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 cit3 : nljkd*hdoqyc.+b p76x (yhqn(c7rcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series6d-za3p;vnsw8 es wx 7 circuit, the resonant frequency of that cvs8s; a7pdwz6we x3n- ircuit 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 r npfiokp, ulcu*h, k4;u4 (l* rx9ztd/esonance,

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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 occurs w3d,nka8w b6rny)j ,a zua68 ddhen

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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 rot(*rua,gq3tu tl v419yj9l rxlating in a uniform magnetic field of 0.20 T. Find the magnet1ytvajll *qu 3r49lr9t,x g(uic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius-u;k-it9 xo/m dkzw -s bcwu1/ 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic fxw-1/9wtoc- us uk-zd;mikb/ lux through the loop when the plane of 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 0.10 m is rotating in a uniform mag;1aq tjdqo g4qx(w8rf6 5i3dcnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an an(3tqc qg jxa68qd 15ri4; wodfgle 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 adjusulmd.f8 *ly pd:uvt;: .9vevqtable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes faj3ny .81ysv ,9,o sg0zb xiv6twm3by rom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A a 41faq7zum*y/h2 ryk /.vsyqunif.qa *ry m/uzsq1 vh2kayf4/7yorm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 72qrlxw xb9 3vo.mop6 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 area 4xw-vak.b u:r $0.20 \; m^{2}$ 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 60nl144 (afmfwaur 4f*t m flies horizontally at a location where the downward component of the Earth's magnetic field *(u affl4rm nwf44ta1 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 thgi46s .zj9 aehg yi9y*at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a sig9 jgi*9ayy z6e4.hconstant 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(6zp cpxl5-j k 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 100ml62hazl 2s. s(atvz . 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. ir;hv nv 39omn5kgt+3 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 of rotation, what will be the maximum output voltage of this generatnho9 r;k3 vv 5tgni+m3or?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consishk iag-925g f8vj92 ;hcbq jr3kuc3csts 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wiy ik +)x(xh+auw9:ydqw 1ai 0kth an output of 12 V maximum when rotated at 6ia)9iwk a x+yh(:u1+wq dx0y k0 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 gener lum9ji2(fiv .z oy65e0nlgp,ator 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 mof ac/(e7hf60ma,j ototor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operuln mlh h*ka+vc y/44e. +zqz9ates on 120 V AC, aculke+z z4qn*.9y hlma4v+h /nd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vlupe .7if7tidi4t h:; power supply. The operating current is 1.0 A. f7: lhietuiid4t. p;7 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 w u;;wr +zx)+fz/egf dconnected to a 24-V power supply. The operating current is 1.0 A at full spee+;g)w+xzf;w/z u rdfed. 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 ayb.3h9wryi gg/ea 9cs)i56 b 24-V power supply. The operating current is 1.0 A at full speed. What is yi96/ sg95beygiahabr.cw3 ) 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 remgmp *kcc0bp-0uzy gr *q .n49duce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secgw8 eetnl;y r7:* idj2ondary. How many turns l8gitdj;e w7:n *2ryeare 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 ( kuscdh0m6 e10m/p e 7j2k)m;cdxoce necessary in a 110-V primary if the 24-V secondary has 100 turn6 ocdmmpe0jke m(7d u/s)ecc x0k;1 h2s?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary chs xbjj*yq ;;1oil. If the current in theqjj ;shb1;y *x secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 10092q l.tmg 2y/ei cmi(bxpa z5qli3d50% efficiency,tim mcigl2zqi2 /950x.( y3d ea5pqlb how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V,+n,.cka9 nqm ppg spm y6:pc4 at 10.0 mA. The primary coil operates on 120 V. What does the primarp nn. py6, gmsm:9 ,+cpacpkq4y 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 itm f.(05nkxr( gr:;oghyl.tals 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 sn x0 :grm. yhlrfa tklo5g((;.econdary?

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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 :y4+ighx d u(jsecondary coil. If 120 V at 2.0 A is applied to the prima+4:hugid xyj (ry, 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 ikshi8br+exm1)u 3q a* ts secondary has 200 turns. If the input current at the primary is 100 A, we can expectau* 1)+bm qe8r3xhski 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 secondary has 200 turns. I6zi 2d2o49k jfkcs y v8i:tw3tf the input voltofi23wy 6ki2z : jv 9tsdkt8c4age to the primary is 100 V, we 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 turns and it 1w;01aksq rdds secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectingdrds kaqw 1;01 frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltbnizs)( ) t7smage 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 secondary if the primary h) )izsn7 tsm(bas 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 uswu3w16mg 6)tnc ;9 3nja/zm znncjc-c ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance;n1c/jn tz-w936m m6 nwug ajc3n)czc 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 u;h8m7rf0wtzu0p spj 3q+dp3 60 A of 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 percentage power lopwp0 ud h+3fztm sp38q0rj ;u7st in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ts, *k/uzuq0aoo;8jl8 w40ju lk ig;aof 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 uz0;o 8uos0jlw4/aa8q ktkguj i* ;l,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 0.6358tp *rihwrs 0 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 percenwr5i8r*s th3ptage 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 transmitte713lx iul mp/u 1q 8.ww:xrojtd down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V mitpw1r1ulx 3 :q.j/uo x8lw7 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. Idf/sr xu l/et;) ;9brgt is to be transmitted on a line with resistance of 0.60 W. t9es /;)b/ruxr; gdfl 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 sk- d*hq9kzsmrk /c :-ttored in the coil's c/h -9-*sk zk:dqkmr tmagnetic 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 containsspps+6b81 7nf t7qd mp a 6.0-W resistor and an 18-H inductor. What is this circu6p78+1ns7fds p mpbqtit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 - t.kdpu1yb,/ riafp4o o(elt3 g* s98v)ocfsV?

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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 pe l7s w5yxls6 m1tbj(.eak 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)b xtnac g;sqo) 2481s, rsjpe of the lamp?4sb); oxr2netaqjspc)g,8 1 s

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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 suza)9qu3dp )fatf i1 a,ua;1pqpply. What is the peak current through the resi t;ad3p ufpzi q11uaaf))q a9,stor?

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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 blzhrn yhu5 o663yw;kd2lc-; power dissipated izob5 3yun6lk h-h2cw;dlyr6;n the 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 w/xafinh09*rw(vn x w 4c9d (k50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resu/hslk( pz y saz: neifgb 3y9c;*7w/3istor 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 ress /ko0nc4tk) v)u,hg bistor 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 1.0whq6zb4;7bil5ce ,b z-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 reait x4ducx9nl f81ed/; ctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will afhc6njici6 ;hh6 n)t/ 14.0-mH 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 inductms1eq bc:/27beu0ugejm x :0vive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in ad)dk 6/cbuwf7bnn+c2/d. lu z 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied tz/6k7bdc+ ncdd. bu wn2)/u flo 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 throughd p/ yrykte:-; a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitormnrak8p dnh-y:k *j1. 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 q(t49*zw si2oj.:oa d iv6zn bof 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 reaj p86+vv t7iwnctance 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 r5dlsgba i:38l n,;um.010-mF capacitor be 100 Wg5ln ilm8,u; rbs:d3 a?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?l vlb9;z:v y2hd k+(is

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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 otp8ll6,)6pkh*vj iq0rb7t7 ts r3dsac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitisk3r6t7t6rj*7o8illht sp ) 0dvpqb,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 100m(ez;d n5 .axi-W resistor, 20-mH coil, and 1.0-d. ix(5e;azmn mF capacitor 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 resistor, 2 8trnqg ,jl.m(j/t k)r0-mH coil, and 1.0-mF capacitor are crj.,nk( gtmr8 j/lt q)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 hmcs30ry-l x7)uv*i 8l2tep6fvr(ov is connected in series with a 20-mH inductor, what is the imped2s7 3yoxcv6)eplurv fimtvr80-l*(h ance 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 seriesxzd v56y 1+bocw:o ij2x/m- lc with a 20-mH inductor, what is the phase angle at 100xmw2xl/oci vy+z 51b-6j cod:0 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-r ,,g2dcmdv2amH coil and 1.0-mF capacitor fcm d a,2vgd2r,or 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 needed in syin:ow0)cd-sx -e: ojeries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?sy- :n0xodw cjoei)-:

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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 ixk iurr 0(1xb(w35x fwn series with a 450-mH inductor at 5000 Hz for a total impedxr5(ru31w i(xk 0f wxbance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fo; su)5; gtwwrhr a total impedance ofwgst ;u5)w rh; 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-mF capacitor. q7 av-ony-8q hWhat is the impedancevanq-7h y-o 8q 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 needd q4 c t*d3qcdg/ti;y6ed in series with a 10-mF capacitor at 1.0 kHz for a total*qq/dig6d4t 3c; tydc 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 at 1.0rno4: iturs *iwb+ 0(a kHz for a phase angle n0w*:(t + ribraisu4 oof $40^{\circ}$?

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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 1 4iqynqa* ( s*j8rrs8;pla mewith a 30-W resistor at 1.0 kHz for a total r;n ( r4massljp*e8q8a 1q*y iimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What i.* tb+dt;hu zqs the phase angle?h q.dubz t;*+t

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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 z*4 sa(z:gn8qj ymoz0 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cong4z *8 (m:y0zszoq njanected 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 capaci nv67;rb7 lzn3uh:qjstor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60:hn7;3qrbuj 67 sznvl-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductor- 6(lican4z ur of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowz r4-c6ai (nlus 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 angfsv8 f2::fdfg le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a2f s:fvf 8gf:d 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serisfp plzhwd5uy6yln0 - 8g 9;5;lntq) fes with a 500-W resistor for a phase angle opn5sylz- qp96h;wfnl 0y)l8t5dg ;uff $40^{\circ}$ 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 =,z2ve h(iks08pzl m+q 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred frome zvi+h2l,m 0k(p8s qz the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resiste( rx.lgx+g y 7ke)f 2i(u. yavr(m3cxance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the(xyigr xur(+ylkvf2(eg 7amecx3) .. 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 i63;htidlf li p:;j(:w zv:tz*ce 7 gfss $63^{\circ}$. 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 resis*bdjo p2 5hah5tance of 30 W. What ishhbp52do j5 a* the 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 containing av3rnkf0isr :r-+ex4. ub mxi+ ; nbtq( 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected4 bsk.t+m(nr: 0fbn+xe3vi -u;irqrx 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 fresg d03j wtjm;j;2j yu)quency of a 1.0-mF capacitor and a 15-mH coil in series?u g32wst0;dj m)jj;jy

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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-mgxk2iwxoje 7p9 t4o ,.r ;ae/hz/n0mdF capacitor for a resonant frequew rhkn/j 4eed ox9,xia; 7t2oz /0gp.mncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductow611in.q b0jg/lmm ktc2e4 aa fubp-9f(sv0 f r for a resonant frequency of 6l.a4/pc(ebqf fvw 9ai0nm b1 u 1t2f-g0msjk 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 f4v5kg9/o. ;f nfpjarmust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the fopfkn9raj4.;5gf v/ circuit is to be 1000 Hz?

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