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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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*i g p -lyuc y(pk,e+qtc7.pz+rjdg)6 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 inductio of) a edk jf.+7axa+ou.2dw.mn 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 produces dutl.bqk.h /vno,4pa 7 z x2j+what kind of change on ta hxq 2upj.,.ov+l7kbnz t/4dhe 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 m-aa5gg; ,8caw ngkkg-agnetic field through a loop of wire produces what kind of change ong8n5 k-wcag a,a-kgg; 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 pp 6nh .hkn0pl:qt*s9 of change on the induc hp: 6q.nhpn0* pltks9ed $emf$, 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 magnefze,u c*m 5xdpyuc++2xe mi;: tic 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 lk vlo-zz,yrj1 1hk*+k)gp2 lfaw, the direction of an induced current in a conductor will be that which teno*kl+1jz- zkv)yr1f lh2 pg,kds 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 above 2m.o6 dwxsds(its center with its north pole pointing down. The stationary magnet induces (when viewed fromss mo.w2d 6d(x 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 c v*mnu+1plt8horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches t*1 ul nmcp+tv8he 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 magnets7u,+ nvap 0 hilzyo0i)yu;u+ic field vector points straight up. The i,huyn7sa) ivzl0y+u;+0opu 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 magnetic fieldv, cty02fg.,qb b ,kzt/s,akw vector points straight up. The magnetic field suddenly grows strowt.2bgt y v0 ,a,fb/sc,kzk,qnger. 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 in a region where the magnetic l8bqb 1 rfw2w p++sm-iez(z. cfield points straight down. The magnetic field disappears suddenly. 1zwi bzpcs+.ew +82qr mf-lb(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 a6bt 0jcnd(z*x2 p3+fp.eq; rn ixj 3us horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the z02bs3qc(ui .e 6r*jjp x n3fnd p;x+ttable, 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 a d 3*i3lvh2cnlw 6vk+bloop of wire with the north pole entering first. As the north pole enters the wire, the induced current bc 3dl 6hk*wn+l2 vv3iwill 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 sp og:gjd2*x.yq)hs2kl eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight d hx2sj:k *loy).g2 dqgown, 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 angular speeh98 p(cgn2frr*sqj4 r d about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the if(q8rch4* j29rrp sgnnduced $emf$ 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.ts. yi *3a 6so2o9,l8u2ij rw6ybmpqs
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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 v *;kddo .(jwl3e5r skcb4g1l 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 fiel sv33u+pks ,o6d xlw dqnytf /cy5)h( .qe:g:fd. 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) - uun)gy9 ws*zwub1ru.iv d 95is moved northward at constant velocity thuw vn 1u)-wbruguzs* 99idy5.rough 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 constant an:0r9rhxm1pr9c 57(bpx ydf lngular 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 tran zna4lqm 0eot -3wo:i-sforms

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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 lkg hs)d)yhx g;e(v i.wr)2 /c60 revolutions each second. The frequency of thsv).x kydghh;)rl ig/ )c2we(e $emf$ 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 deao1tr): vozhv)lw+9+ eqp)b b 40icxnvice 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 dev9z y)rfv+1t. qal nj6zice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary 1,a) 335sb b j xist(pt5 2pc0oxodptqcoil contains more loops than the primary coiltp10s3xtjo)p52dtbx(qa, pis o3 5 cb then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the ey-wj4+my cx 4secondary coil 44x+e mc- jyywthen 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, th9*3zm*jwe6i vbtj t v66rzqd; e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuec w.q l)pdi,(1cbow/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 inductor areq-dy kr(1sftyd,p 9g8 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the-98qyg (r,d1t fspdy k 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 0 lnq/-+xno zdv0k/sco33wz hare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bzz-od/ 0ohxqs n3ln3k0c/ w+vattery, 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 wty3fnayae0h3 c(u)d lx502 meith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit q2qdqfcmr3g5 6lr8 p6ak )2eswith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 seriesn3 +:locfxaj , to a battery. The time constant for the circuit re3nl+a,ofc j:x presents 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 serice1ka6yz8 9xb 6pbn5aes to a battery. The battery is suddenlxe ya66pa1 cb5 9k8zbny 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 same units e4g-lu kq/zvm. xcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connecteibx und3qb .; 0qy1 p-+a(yreud to an 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 circuth mwv4yifp /gi8 m.px :(r)v4it, the curren/w mvi8pg:. xrh(4yt4iv)f pm t

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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 frequje8. 4tu+fwa ;vgs t4fencyuf.fje t48svga +w;t4 is tripled?

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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 vod8g;hmx a5 w8zh+y/lwltage across an inductor is doubled, the inductive re;lhgm/8x +zd8yh5 w waactance 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 apn w sk5 m-+r(tul lq11s9i 4hmhqb64cgproaches zero, the inductive reactancun( 4l-kiclg s m mbt41w56qhsqr 9h+1e 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.7e k(bhpa;idmhu4:);e5: g)fhmsp ,m*awsdn In this circuit, the current w: p, epg)me;si ;au)b7safhd4hk nd(:h5*m m

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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 circu1 peee1 2u)n/ffig/hjit changes by what factor when the frequency is thfp)1 nege //jiu ef21ripled?

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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 ca6z (zz3wz) rus8j(flgt 5sc7apacitor approaches zero, the capacitive reactancr6( l37wgj zc sfzuzaz8ts 5)(e 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 9+vsffv b/7/y+ iskmg between the voltages of the inductor and capacitor in a RLC series csg fks+vbi9 7yf/+v/m 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 an1v60i dns*2soi (n) k9rxxoic 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. The impedance of th.nx5 q sn z m4s;y nhv9k:.wzkygec(u+(7*xyke circuit increases if R increases. When is this sygz sys (qxnwxvky4:7*eu kh( 9c z+n.k.n;5mtatement 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 inlak27c2: jl0awrwb gz .zrx-;creases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if l5l*k 57viiyl/usjoh j q1*,4fne rr .$X_C$ 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 un7m zgi2 cq-7x spf5e: ((amucircuit, the 2qnmm zu7s(if5pxg: 7au (-ec resonant 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 resonq e/ido*q:tz6ance,

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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 occurm0 igu.+*lefutd dz/-7kg m s1s 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 b tg.n)ax gxp9)*rj4mmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector a.rx4g *mt anb9jx)g p)re 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 rrjn)sj o.+u4dai 91b lotating 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 per i)js+j 4a19u orbdn.lpendicular.

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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 s u4qk3egejz95. ,wlk magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field 4sek3luk,jz 9gwq e.5vector 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 adjustaphw 4:z bt92kc6lb- ko)bg l3bble 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 o tmg;j3k( ;oschanges 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 witvn*nj.6 h-jkl* /weiy6eqe g64 bte* zh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 inle 6je* n4* yiwnkz-6eq vte/6bh g*j. 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 turns and an a,u 4 nl3tosgx+qfqp d g-c.y71rea 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 ztp h1y*3o d3zarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizpe) 6oi vf27bhse yxg3wi. d1+ontally at a location where the downward component of the Earth's magn7f6)g.vhw3dib 2 ps xi o+eey1etic 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 rotatedr+ vykiu n (hcd70clli01ll6n +4x( ns at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet(0lv xnr+7n yd1c(l4nii6cl dl0h k +uic 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 ay y;,arxcp q75 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 of ie(6dl i*x fxpq2pns7f 8,t+u x, b6qdwire 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 aumxnknzg *k31nj2+m a*:2qnxrmature. 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 nm qn*: +31jx *xmkuzk2nan2gfield 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 wirhu :4adrsk0 imcfd 8;fekqxmj5- + kxs9am,40 e 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 v , dnng;p*qn,ly1pl;,2(y yz *bcxsoy7hmj 8 to construct a simple AC generator with an output of 12 V maximum when rotated ap*b 7h,vgnscyl8; ,o;y d ,zx1j (2qp*mnyynlt 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mf,8+y6c7eem9ijyeih lcuq/5 aximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto d,z*:5kgb, ge6hvtikcxke (f:c) 2yor 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 6lt.f() psmq tc9:; eknz4(:d zwg3thm .00 W. The motor operates on 12pek)z.f4mts z9hq (:d(t t g:wm3c;nl0 V AC, and 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-V power p o-*pfxyy88p7 rc 3mpe-v(wi supply. The operating curem-p38pi( pv8ofy- rcp*xw7y rent 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 po/ 66qo rqvo5eswer supply. The operating current is 1.0 A at full speed. What is the bacoqor v 6/6seq5k $emf$ 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 connectedffjc,2zr:v)fgu2 7gw to a 24-V power supply. The operating current is 1.0 A at full speed. What is the 2gg uz rcf7w2f,f)v:jback $emf$ 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 pri z 8ltmy4mw+1smary 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-tur-w ,7 vpso37s jbhkb0hn primary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondarvjw7sbh-ohk ,3b7p0s y?

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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 ar1fxr/z2l39 a;n za0q; qn amzle necessary in a 110-V primary if the 24-V secondary has 100 turr 2; 0anm 1aq9azlfnz3z/ q;lxns?

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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 c3k w4lztj58)rk i8;i1gmdnw a 500-turn primary coil and a 2000-turn secondary coil. If the current in the second3j4w dlwt1c ;8zk5m)grii kn 8ary 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 trwz-k lwwl, 6i4.lan 3iansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary.w 64z w- 3,wnaklllii?

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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 transfoti;j ule( 8-+)t lufz(g3:jrkvuwx r*rmer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. W+*w;i:uft rx8tj - jl3(zulr)ev kg( uhat 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 . a(a1eb9nq yz300 turns on its secondary coil. If 120 V at 2.0 Aybna(9.zae1 q 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 turns on its primary 1 xirfij:q * ((x;pvjjcoil and 300 turns on its secondary coil. If 120 V at 2.0(jr*xifqj x1pv j(i :; A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondavf6z0y )dc 7yzry has 200 turns. If the input curre670dzyvc )fy znt at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Irdk podsvho;- c-8- qmz()-* v5u tfapf the input voltage to the primary is 100 V, we can expect the o(s u5-8aom;pq dvvrd-tp )o -kch -zf*utput 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 2009pvij(pi; vr+m*fcihc y9md3q 7,v.ok9y m + d turns. If the power inpup; i.9(3crdmq yvh9v fv+*km97jdiic+ ,ypmo t to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uj -; 3/8rwif kewzlz,tsually stepped up to 4500 V by a transformer and transmitted through a po le8wkzi/3rz ft-w,j; wer line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltageew0n73gcr ecy3 5)riw is usually stepped up to 4500 V by a transformer and transmitted through a powy0c i er375wnwegcr3) er line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagef23*sn s t o,nufoe(-m 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 transmission line i-nfs m,3eo2on*(ufts f 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 resista. j*sa+,kekz*wq6 ydlw/*w nance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the /wl e*k,zj n6 a+.d k*aswwy*qtransmission 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 7kc; 5b:klaf mkm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original7 k lfak:5mc;b 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 d 4gkb lb/ubmm 2+k56qgown a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V i+4b6g/kk q2b bu5 lmmgnstead 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 l)gywkh2-6 r0ezt0an: yp l7gis 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 ouk 7y-)h zt:6wy rg2anpelgl00tput 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 c. hfz0gu9+/poucgdn om 3r +2uurrent of 5.0 A. How much energy is stored in the coil's magnet +3fm0+9n gur.hzuoo2u cpd /gic 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. What isiz,7jo josm0h6 8/utg this circuit's s0mtugjj/o68,7z hoitime 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 volta,yya vqph5 qm4p ryh(i:+.pn 4ge 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 ingiq q- 8rz64gtsy (o1oto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a nd+r;-v3d;(iiyft izhs 6/u mm9gq.o120-V AC outlet. What is the resistance of the lam;+3tisi-gih; dm6yd r.m/ u fon(9zvqp?

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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 poweu d0 jgf7el6u:02 wi mf)3fluvr supply. What is the peak current through the resistor wiudef0j6f 2)7:ulf u03gvl m?

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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. tzf f7bfu( kl6t-anc. hc+wg9(guuj 3y. 2 da6What is the power dissipn cut2a -(uc7 ftd6(f+bwz .gy. ukh3ja6lg9fated in 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 50-W resis esuho*f9.*br/z+ w intor 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 rehqr 2emo/6;t3 lel6m ksistor 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 r7,;c veek(cbkl.zv1+ lmt) jmntzz.* esistor 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 *.oxhjgy9d)n)er zl: 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH co8evxrw)ez 1l0q3x 1j gil 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 wilvu )rbcraudl.j. 42;fph zph1t 77:wt/wbe9 c l a 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 induc8sx j3xpumw 7t 1d a++kt(j j;haj z:1bzi6co(tive 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 a 60-mH inductor when 120 V AC at a frequency of 2j5pjbbhq+-mnnqksfv/:/mo h ) bhkh (1 9/5sw0 kHz is applied to ib b/h-95mv hs)h:nq5/pbkqjh/som w( 1 nfjk+t?

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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::h +sfsze //-pzhl ho 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 capacitivot )6cem fc 49hbr0,pldz8ow7n7g)nm gk; k6ue reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10dwvoqys/ 8 99b17ecp e 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 rvv -*n 7xecv7veactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor3ygoxsop x9 tlmc6700 be 100 Wo0 9sl3cmxo tx0 6y7pg?

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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 kki;3x;b c5wd capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistancef :*n9ewh zrq(bewb5+ , 15.0 W inducti(ren+hw5zbb : *fweq9ve reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-m ocoejm*+ fm)zj 3lypd r 9iz:j5/.s.sH coil, and 1.0-mF capacitor are conneceljzf yjoj*s. msdp) i.r9: omc+z3/5ted 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 resi-frhb czc9g+bak (cli kn*r99+g 1q p8stor, 20-mH coil, and 1.0-mF capacitor 9qk hb g+r19lp 89acigf*r-cb z+k (cnare connected 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 conzkq:2l gy1tbct 1ej53 nected in series with a 20-mH inductor, what is the im1kg21ejq5 zltyt bc3:pedance 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 b0dci)9dz8 .cmex us6 ,v3mgxwith a 20-mH inductor, what is the phase angle at 1000 Hz? d )6 3mxdcsxu9gz0imcv8b ,e.

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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-mH8ln(j c:rp0 a kc3jlj* coil and 1.0-mF capacitor for a total impedance of 1j0jc (3n8*aj krl:cl p00 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 followingepjcv5my g3sw+0-8w v capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance ogpv y80e-vj+3w5 wsm cf 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 s)(1xl/sijxh jiti(e :eries with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?ih/x(i) t xs je(lij1:

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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 puig)bh8 ukbv+gq 93wc wi g5ff(n5be0od2); kut in series with a 100-kW resistor at 1.0-MHz for a total impedancev3gciww9gf0)qgufbo+ 5b528 kk ; u)hidb(n e 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-mF capaciscm 5l*l)br; gtor. What is the impedance at 1000 H r)gl5;c lbs*mz?

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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 capacitm su7d-0fos 6h8nh5qdor at 1.0 kHz for a total impedance of 48ms5d d 70sh huoqnf6-5 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 serieiozjv4etq *ostf 8 v4nv;k-:vj ) l0r1ak 8xr9s with a 10-mF capacitor at 1.0 kHz for a phasevr1iav*kt;l jsox4 t 048 vfv:kqr8-n )j oez9 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 serie 8pzvl; ,j xtder;er91dk- tj 6xgp ;a.oxs3t5s with a 30-W resistor at 1.0 kHz for a total.opt ;e ;zratej;l1dr 5jp9vt83k d-x g6x,sx impedance 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.r(.jq rz o.(d*6xm laf What is the phase angle?a.( l*.rr6zx fdom( qj

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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 resistor, 20-m- w7ob60ggwtbacf2sg,(sq 9l H coil, and 1.0-mFlfa0w tbqcg-w7( gssbo g2,96 capacitor 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 capacitorp(ovq zkg/o5 plid k oye26*/h*f+ (fx, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t/d z2 q hk /6p*5+y i*xk(flovfoopge(he 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 capacitei;19t-vrp6 . uzy wz3ucwn.zive reactance 30 W, and an inductor of induct. 1nuc 6z pi;9z.yvu wet-3zrwive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contain x0ka:d+e(0vty7egz zp2m m -ging a 50-W resistor, a 10-me m(gx z2 7demkzypvt :a00+g-F capacitor, and 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 in series with a 500-W resistor for vh7 +z7a9xslfyu9;wh a phase angle of7zlxw vh9;97s f+ayhu $40^{\circ}$ 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 = 20fffj koa;- q+1eu y:s lpj*7:w.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in owfkuf: -qsj ;ep*f+ :17ljy aorder to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 10xg.ymc3 wk2z5.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectgz. kyx3cw 2m0ed 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 cirhw*s6w g- ;kcbcuit 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 impedx- 1vcop zyo*gc/d77cance of 60 W and a resistance of 30 W. What isy17c zxpd* /coov7-g c 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 a 50-W resibuu8*)7h:de zsdms 4zstor, a 10-mF capacitor8z m4 dsuz:h*ubd7s)e, 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)1v-nrrurlak2juldw gb c-9 96l2o(b of a 1.0-mF capacitor and a 15-mH coil in series? l62 -jua9)novb -kwrgb9d2lulc1 (r r

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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 wzo7jwhg*5m ,y ykhd2x(uz2:j ith a 4.7-mF capacitor for a resonant frequ(,7kxz w5uymh djo2 z:y2 *hjgency 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 i.dvst-a na1 :2cwgkwg0px :4x n series with a 3.7-mH inductor for a resonant frequency of:x2awgc 0sv-wn tka 4pd.:1 xg 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seriel -l qzz 2,pldf-q;2ens with a 30-W resistor and a 40-mH coil if the ;f-llnzl-q,d22 qzep resonant frequency of the circuit is to be 1000 Hz?

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