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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://autodiscover.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://autodiscover.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 unitakpp .e.h8e.4hrt*27fq.g+p t fidsy s of magnetic 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 induction states that nqz- og9 gd-,t,j2+xqkt1 z56grubxathe $emf$ 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 produces what kind of change or4w 59y3w inkcn the induced 4y c wk3rw95in$emf$, 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 fief4;3qv3sw g hmld through a loop of wire produces what kind of chv3m3q;f w4hs gange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on 2)g6zj.t ogt, /r,e s** lcqw hbex5tdthe inducjr2z*.,5* egt/s btl xeqcd6w)o,h g ted $emf$, 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 magnet2:m5 g bd7ha gmc.apbc3m7i- uic 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 m bt04 hcs 5hxrc.c:)oan induced current in a conductor will be that which tends to produce which of the fo)5hchcmbc:s 4t0xo .rllowing 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 a*d*hc8 f,ec yb +hn(mgb(kpl2bove its center with its north pole pointing down. The statb l* f (ecpy+h*kc(mdb,2ng8hionary 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 fla ,rpr :es/dk+mt on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fall,s / :+kremprding 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 vectordv-alksk0 s,9jq e -+d points -lv 9+asek -sk0djdq,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 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 wherekq*v 60dp0o vjrc0q.d5 r;eym the magnetic field vector points straight up. T.mkr0dc 5djypr06qo; vqv0e*he magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top inlvjo u:(sse7 q7m4+vc a region where the magnetic field points straight down. The magnetic field disappears suddenly.:q4oc7umvls e(j+7 vs When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and (tmqhw. e 3di4carries an ever-increasing current northward. Two coils of wire lie flat on th3 e4t(md h.qiwe table, one on 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 j: -rjz/hgq du7z .o7xa loop of wire with the north pole entering first. As the north pole enters the wire, the induced currogzj:.q dr zj- ux77h/ent 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 an axis w n+t.- bhsici:ms9 qj+hose direction can be varied. In a region where a uniform magnetic fihi.j :+9sb- +cqnti smeld points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant a6( 67h2l ugudlb0odww:cnr:gngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straig 6l06h rg nd7gcwdo:uw2lu( :bht 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.sqh4icv)f:z; m( 6 ldt
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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 tnu15kcyad2 ;h n 4*stc+xuv7pn/7nkwhat 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 magneti rh.y5 q) cfgq(j-2 373igcjr1vd rndyc 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 moveysk ,: sa((akd 4z7y01otoi( .bbylntd northward at constant velocity through a magnetic field that points straight down. Make a statement concerning ti ys:.(dlk1bby0t a,o tzs(4a yonk (7he 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 rzttyt vb 72sik7c my9w .1 k7+9xeuu0a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator vuc 7kp.7 ui.edes e-c4j7;qx transforms

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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 6el /qy 3a3c( x9aqu7ro0 revolutions each second. The frequency of tx 9lya7ac3q3eqour( /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 devicp7i um2nt 0+3bweo fg z1)y8rhe 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 that2j,.ffr6 skuo+*2dqb a 9hoyg

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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 c*pde8 piw) +1 y5vd,:ihgaajthan the primary coic1g wpa+8 diva : *je5)di,yhpl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil c-1mtnts9 ewp;eu :b 2uontains more loops than the secondary coil then it ; etepw t9-b2 msu:n1uis 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 powe*+ +ntm8nqp z,pj*+wvjszqbl11qn2br 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 resonantgk ppp3m .n)fx.: rh8e circuit,

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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 s::9,rito5+l mazibyzeries to an ideal battery of constant terminal voltage. At the moment co9+btami ol :ry,i5: zzntact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectedehsbw2t*s0/d 9 b xiv8 in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltvt0*shxi e8dwb b2/s9 age 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 and resistap9k wruih3m+-nce 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 i i:8.q9ofzchresistance 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 serb 77vacr. uvwj-1r8 iries to a battery. The time constant for the circuit represents the time required for the - 8 v71ujrwv 7a.ircbrcurrent 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 csmdpn gwz ,scr .1w(a2cb8m/9 onnected in series to a battery. The battery is su,c psz92b1 (8 dc/wwa. mrngsmddenly removed from the circuit. The time constant for of the 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 have the samep;fly rrt2l4 ws)(1l15ci a1 7s4jdnb p, iunf 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 circuit, the cej5v(x z:seb-- ms*x+m:7g 9mxz+twdbn iu m(urrent

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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 thian4x exlitj0, v 39ef4dc* f4js circuit, the currentxce3 9 aj404dv,il4*tfexnj f

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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 7rd+5sb uhd7tan ac circuit changes by what factor when the frequency is trb7 h+7sdt5 duripled?

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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 A4)j1h)j 9g 3jq,xha3b qknetiC voltage across an inductor is doubled, the inductive reactance of that induc)1jhx393aeq)q h 4i n jtjkb,gtor

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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 voltn ji/+ky2ef5dfe; 7 qrnq 0mpw /9g0zoey1u/aage across an inductor approaches zero, the inductive y2eonwf qp /r0zy/fi/ 0qk ;e+jmeuad7n5g 91 reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. bcn0,z7 c0cfovm-b4ho q+h+ f In this circuit, the curren+fo0cc 4bhc +,0bofhmv 7-zqnt

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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 ad4 hn vikhg8dr-p.pj9jo:7.yn ac circuit changes by what factor when the frequency is d oprjg.8 j-7dnipk.y4hvh9: tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capa*2c9 ,pmg(kxb kcpy2 fcitive reactap,kcpf9kb 22(yg*m xcnce 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 betwpvm jh( kbo4 kv903uliar) +q8een the voltages of the inductor and capacitor in a RLC series circuh+i4uqo3j8l90v(pvk ma )b rk it?

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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 aj2z2g/; f; 8 /wvyabix.qwn8 4jgxhmp n RLC 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. okgy(b)a,z0;bs4 f k yThe impedance of the circuit increases if R increases. Wheny b (s by0k,)fg4ao;zk is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases iffdv+,i;t9 4wz 6ptc2,y guhn l $X_L$ 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 incbn)qe z2boqrg,q84 ) du l8x.wreases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu+ zo,l8wklws7uqb -;vit, the resw+87vko ls b-,zwu;lqonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonanppxb 6yl,*go1o zl7g ,ce,

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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 lxw snd f5,.3ncircuit 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 field of 0q-zyvb .idtf az 1+4e-.20 T. Find the magnetic flux through the loop when bt-q +v4aie z. df-1zythe plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform maw./2tk5rxgn0 b fk trv* wz19mgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpend g. 15kw t9tr2fbwkm0*zrvn/ xicular.

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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 vbhy*k e-. ,v-dzi1l sdyq.(mm 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 the magnetic field vector are at ys.dm(v.lkq z,yiedb1h *- -van 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 aqq p 0q1yp0irmhiev f/c830w): fmh+u n adjustable 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 change 2lp aa.tt8q3( +t6pb0h dgdpgs from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wirukp4 3ic1 4chkpe+,us e on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. 3pk4sk4 u1ccu+ehi p, 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 turn vm 5.*)xa+x :9 bb;koe2fo6achcbav ks 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 aa/prdwj 105sv z52iudrea $0.20 \; m^{2}$ 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 kc42y:rxi5zzspan of 60 m flies horizontally at a location where the downward componentci krx4y: 5z2z of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulaoeg1we ytw+8v: 43mtsr velocity of 2.0 rad/s about ay ev +estgwmo:84 13tw vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loopsr+zqq b d:c*u: and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns or b.lzv(z r1l(f 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 loops2d h7et0 fnk,e on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abou thdee,72kn 0ft 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 turns of wire of .5yi is1z)fw1m2j zna 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 genera1efatfd8y o bn8g2 08dgj:qm3tor with an output of 12 V maximum when rotated at 60 Hz. A m3ade o 8bff280jgq ng :dt8my1agnetic 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 zj+g- .1de+pcuuyn/ ba 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 mot6 r;5smgc*) jnnwouz8or 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)tf+tbsc4g ( hjfru7xv/ +c-h.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bacf-h) jt4rxfsbv+/c +( tchgu7k $emf$ 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 internar)7s2df 9zdg 91ix fz qak( 95xyx.,p7xmgczdl resistance 6.0 W is connected to a 24-V power supply. The zdmg1xz7ax cx5 z)qr.99 id xgfy p(k92d,7fs operating 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 connected to a 24-V power supply. .ipn)pe a)*ru The operating current is 1.0 A at full speed. What is the ba) pa.)r n*upieck $emf$ 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 internabyo hxk( c6gx ;nqd1s:os*.k/l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full s:oxqbs x*(h.gs1; 6 d ok/kcnypeed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of - tao r2r im0-8zstv:d0 kv nh65mfsd)$120 \; V$ 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 primaraxp1ps6mj- ts qjwt +/e dbta5bf); :r.1:sapy of a transformer causes 14 A to flow in the secondary. How ma)atjbw j .+xfrs- mtp ep1:dp6as 1a :qt;/5bsny turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-/feglolh0iv1 1emsw ,*gh 4p(V primary if the 24-V secondary has 1(vh1l1e p*m,sol 4 wig0hgfe/ 00 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 50vwx,g48 d9mx6ud n)zt tjl;g.0-turn primary coil and a 2000-turn secondary coi4;du6 l)djgm ,.gx9txwtz v8nl. If the current 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 primary of a transformer. Assumin:o bp1y3xmbu pf9 j2,,,ybhedg 100% efficiency, how many amps at 24 V can fy xpb ,,:9fu,oh pe1ybbdj2 m3low 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 mu 8 w:ky7-fyqd5.e :8n*wite nruaal:A. The primaryqnl-a y:f.nawkt7 8r: iew5* e:duuy8 coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secod0z7vhi2:c3tnjw6 1 5kpgs c bndary coil. If 120 V kpc17dsz3bj 2nwh:c t0 iv65 gat 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 t hcko21 3:-bm, fyuuiourns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currofm1co 32,iu: -hb yukent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.7qgyt( lw m/cv+ p5v d; do251egzve1n If the input current at the primary is 100 A, we can expect the output current at the se;wd1gvn 5yz7t1lpodqg c ve5v+m (/e2condary 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 2xj6p)b u.mboturns and its secondary has 200 turns. If theb)m6buxj op. 2 input voltage 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 its secondary has 200 ;pcpt*mem.r7 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionar mem;p*.7pct l 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 1) uyi:0o i/mg7xm/mthpxx 6k.q 3 snzat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power linn7xti3:s hpx6m0ziom/)ugy/mkx. 1 q e of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vofbk9i2uaj-s o0f q6)gx txv. 5ltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 )9ka fjf2 tgqvbxox s-u650.iW. 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 currxy1dzebhhw4,p8 o: l/c-ly d, ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the ddc1 w8 zo,h:eyh,-bl l4xp/y 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 op4:,mou z-y b3zahtgnj2 r,u4dn+ *wtf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissio+uag2 wph4, 3y znbtr4z -n,:tjomu*dn 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 resist;0 /eckg h/ivpance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the orihpcv;/0g i /ekginal 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. cq53 wo 8 wdtt-:2 et 1nu,uopbj54kxgHow much less power would be lost if the power were transmitted at 3000 V instead of at 10-3tteto5q cwxw:4, ognp51 dku bju 8200 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted gqw*/mc mbj 9pzj 2ed85c 2w4zon a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powe4bpjz*9ecwmw/8 z22g5q jd mcr 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. ht1uw1*f4qe .p n1lpfHow much energy is stored in the coil's magnetic fi 4ffquhp* epwln.t11 1eld?

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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 contl (r;r*d+zgmqkc8 3biains a 6.0-W resistor and an 18-H inductor. What is this circui( + l8z qkbc*rg;di3rmt'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 volt0jwoy 1gli.2qf e2; pzage 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 currenda5of (oyk3 8bt?

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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 1z8*9hqv t 2gx+q scdcem;ht1l0e 4zi;20-V AC outlet. What is the resistance of the lampd c;sxt ;ctqezh2*9 04mlqh+vzi1 ge8?

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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 5kmeo+2+st9 :sf w . jdlpfll)power supply. What is the peak current through tfs. ej2dpsl)w l:to5km+l+9 f he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wha:62g,txv q pwkk) oo7bt is the power dissipated in the re k 7o,pxbov6g:) 2qtwksistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a87n9gfh v6rck b dd hwn*toa)q4*5w,x 50-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 re 1vhw-f gpqq- 1z:0tauy4bb 8lsistor 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 aj2/lqqd zm; 3tfsn.x 9 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactancn ztq9c8k4c c6e of 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 reac 9z:bf qa3idnzh:v):btance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rewnia08bp/m,dlw j 3c/ actance?

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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 atyf9;q g+ s ps2+gwrypf ad7k.) 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz iv 46 squ9sfwp 9n, ris1czbj hk*us*59s appliedc95sv,hun19kq 9sbj*pr*i z4sfw6 us 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, 6y /ynlx .xj3a qy78p4p0.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10d382uzz ryg5m6f: 5 ve0hn/u2j f ganr kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reagk mk*1ufsksc/93 8iwctance 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 reacta.mt *w )p2gz/ d.oy )qcdygs6dnce 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 the3q r)ypite6zy+)pze0 capacitive reactance of a 0.010-mF capacitor be 100 W?z)t )+pe pey0z6q r3iy

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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 a uxc;;wde/l7sc-)ki nt 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 serirfvpmwjvyjz62+(. / g3 gsk(wes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W sv rgj/v.((3 zfygkj6mp2ww +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 resyl j9 j;h6k;3plrz /lfistor, 20-mH coil, and 1.0-mF capacitkp3; 6jy;/9lhr jz fllor 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 a9d:-g fkh) uxd 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected dd xfuh:k)9g -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 with a 20-mH inductor, wh5(uv i zmrb;i)at is the impedance v ;ir) i5zmbu(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 resistora k+x s gvhscns4+1(52hypnszu* 3-i t is connected in series with a 20-mH inductor, what is the phase angl 4uxh21i 5(3nczs *s+hs sgntapvyk-+e at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a(4i(y* m,hszhrj. pks series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of y s p.hs*hjmr4( ,ki(z100 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 nepu;)n0 p)nrf eeded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W atunn)p fr; e0p) 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 5000 Hz for a t( j 2,y ywwcmo,ab/;vgotal impedance of 40000 W,v(y 2wmg wyc/ ajob,;?

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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 for a tdj3 +1:yf0xqwa+lkar) sr r3iotal impedancq3sf:r 3) y+ardil 10axwrj+ ke 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 seriesfnq1ien*4 6w.o6 o eu2w5mc/ajm:uor with a 20-mF capacitor. What is the impedancee66n: n eq2coa.from4/51umjoww ui* 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 series with a 10-mF capacitor a*v.obz oaaso6l6(e )f ohj- s9t 1.0 kHz for a total impedance of6 so.e9(laozj av)*bofoh s6- 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 seriik6)gv6oua i6 s t+1xbes with a 10-mF capacitor at 1.0 kHz for a phase a+ 6ax1g ) 6kitivuobs6ngle 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 resis/q 4f9fy lh )v1hz/m be*dgj7mtor at 1.0 kHz for a total imp *v7fdh)y/9mh/ bjfeqz 4lg 1medance 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 w*u02w (ckg .;scekinat 120 Hz. What is the phase 0eni *u(k ;scgcw2.wkangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W rux5 m kyxp+8 6h(qy4oyesistor, 20-mH coil, and 1.0-mF chy4u5y op( qxx6+y 8kmapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a, zpt.h5odiv2 (j6lyg 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ip,jz(doy l5. t2gv6h 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 capacitivk 5bo v6v;8d22iwrj ga/bf3jee reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows 2r2fbvo3k8j;5 6jwd iavg/be 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 3n; tobf2zs7jrw;w 8n for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and tws rbjz72;3nwf ;no8 a 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 injk/rsov7 kp+- series with a 500-W resistor for a phase angle of - /r +pvokk7sj$40^{\circ}$ 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 g *g1uc7oyy-u sv/..7pjrhop has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourc7y. *vo u g7r-huc/y.ps p1ojge?

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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 u,lv2hpp* j 5ocbzyodw04,g.ac series circuit with 12.0 W resistance, 15.0 W inductive reactacolg.z, hpdywbovu2j0p* 4 , 5nce, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC s0yhud m l5cz9/goc -/circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an *f,hgs;gj, fb impedance of 60 W and a resistance of 30 W. What is the power*gf ,jh ;,sgfb 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 a 50 p8k:/w +hlkzmfc-8l4op v1xu-W resistor, a 10-mF capacitpuzlfp8h: vo l w -+k1x/mc8k4or, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in serixuv4ite9n;jmm7 ilc2g/+zlm0 6 ql-ues? uevm0;+m lciluj zt-ng4mql96xi 7 2/

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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 fb-g dlnh4ap:+:xfq , lor a resonant frequency -lxh+qg, pfn4d:: lbaof 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 wipe( e5auy qa .t*zu0d2th a 3.7-mH inductor for a resonant frequency of 1000e .t2 pu0z(a5 qaeyu*d 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 3.cde)dsjh- o vae;d8x +wpe4. nrq4mbe placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cir)+v-q8 dw4s n3rcxd .eaoep4;.hmj decuit is to be 1000 Hz?

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