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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 units of magnetic flux excepd i6ay5 zff2 /poqh.ht* cwv:,5bxnl k,:ql,kt

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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 3n01,v;z2 tarl qozj5nm: ioethe $emf$ 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 o rdvq62xdtomf60c. 6 tf change on the inducetm o 6xqd6v 6rc0d2.ftd $emf$, 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 ts)e4du9wsw rwy hca: d 6i8p+)he magnetic field through a loop of wire produces what kind of change wpsy+dedwaw4)6:s8uri 9c h ) 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 loop of wire produces what kind ofmmay g3w-79l v change on the induceyg mv m3l9w7a-d $emf$, 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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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 fielaq0 e;e7xvg*n// uu oroh,ec*d 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 inddla 3 n 0gd5qpapn6i08uced current in a conductor will be that which tends to prodan lign6 0apd3q d5p08uce 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 36k7quhx 1u:sx+twwe 6hk m8m9ihh (hbar magnet is held above its center with its north pole pointing down. The stationary magnet induchm6k837hwtuhu6 (x 9w :h1sx ekimqh+es (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 flk gcm 1-6 s0gl/kb;dhyub n)d*at 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 falling magnet induces (when vg1 gu-nscdl/k; 0* bk ybm)6hdiewed 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 magnet94spnm2w u7)q wkn6uvba 9eq6 ic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, wh27vq9e as n9wqb)46p n umkuw6at 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 level5y0 uzfu;pre9pb9 fqf.;l7l d table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronge .l e;9fuzy7b0u9rfl 5qd fpp;r. 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 regiji2(x pj5 )b w-q6rn:qd3 roeaon where the magnetic field points straight down. The magnetic field disappears q 6x wj-qr(rb2ei :ano j5)3dpsuddenly. 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 lie hb6d sq0*4bkm7tv0a es on a horizontal table and carries an ever-increasing current northward. Two coils of wire vq4d ab mt6k*hbe00s7lie flat on the 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 thl0;j isyq-cc evc8f+ 6k;uee (on 8x7qrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced curr7+c8;sq 0qelvcy6 ;ejfx ueok8(-cni 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 af3md gvxb(;c7n5q m+: csouy /ngular speed about an axis whose direction can be varied. yx+s(dvgmfbuqn /5 73:o;cmcIn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated 1ggl f:voj k: 8)pydm;at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be t8j 1;:op kvy:lfg)gdmhe 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.5be3dv3;po g e +qq9yh
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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 anhg*7yr l , 5w2b, iancnfk6k8u $emf$ 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 ,e ly+v1qdr8hr gc +c (smy43hfield. 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 eastma rt.0xibvr dwq0,96n)l)c h-west direction) is moved northward at constant velocity thro00htrl.drmwc n,6 )9vab qx)iugh 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 vzm5dsir qrslu e35u5l30 , 3tso/3iq a 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 transformshhro59wg af2 -

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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 ,z;j60 sks c0,awfhdh +daju9 revolutions each second. The frequency of the jk0s a9,0hcd6s+ ujawf;zd h ,$emf$ 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 deox (q qk0aog+3)fasnm- so5q ,e. s *54hlkplgvice 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 devi6 r9 -g mmszr,-cqjb ak98/(lnv8j jewce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops l 7;fa29yjuca0z mrin3b.ms+than the primary coil then yc37 +l0 9mujas2 f banz;ir.mit is a

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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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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil -5m 8n4 *m0jyhb u :l7nfskcmmcontains more loops than the secondary coil then it is lmjf4u mbnm*8:s0h-ynm75cka

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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 po1idf-n :j apyxe vj5.*wer 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 circupn mhk) mxu t2qdcbbf346d12*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 ina 9;dv o0:v;rohjn*mgductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vr*:g h ;n;jodvv0om a9oltage 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 ind +96vc ls pdidqsec3;j (,rag4cv)b g/uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrdv)jbl 64 g(+dc9,/va 3 e ;issqccgrposs 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 as xh/yu.m,79p r7c7emqzhxf7nd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is cf nca gfb*y 6,4w)pnh)onnected 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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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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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected bw.1s w6 qwixht e3.r7in series to a battery. The time constant for the circuit represents the time required for the current to hsi xw6. q7.w 1rew3tbreach

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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 kcpk6eef5: ev.qb v/o 1+rw g5battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to rkew/ o6b5+veg5pqef1c :.v kdecrease 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 sameq o(ay*6m cmgs f(bk21/vy5q r 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 1-z( 6/ozdsvgqf/j zzcircuit, 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 cintm 05b60-u* br-fychlme.p jrcuit, the curren-6 brutpl-50b fm m. nj0yh*ect

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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 tb,t6n*skcxyk 7d 0u8r he frequency isuxbtk0dr* 7 ,ysnkc86 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 voltage ac-9 ga*2jed y2sx4qczwross an inductor is doubled, the inductive reactan2e*c4wa sy9qjx dzg-2ce 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 inductor7q 2/w:toau 3f/jtr3o dz,nph approaches zero, the inductiv:zqtt na/,fh2/u3jop3r 7wdo e 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 sup4jzuqy .wc g*c(k2xf/0ry -irply. In this circuit, the curren/xyy ijrzc qfc0*u(4r.2-kgw t

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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 changes by what 1( vvsdgd j80kfactor when the frequency is tri d0gdskv(v8 1jpled?

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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 Aw+i + de;/iyufd.e4 paC voltage across a capacitor approaches zero, the capacitive reactance of + .ie+f iuawe;pdd/4y 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 th61ggy,jqte a/ e voltages of the inductor and capacitor in a RLC series circ qg yejta,g/61uit?

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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 defined n1 rxb6- v/nxaudf ,4,u*h xrwas $\cos M = R/Z$, 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/;e 364+r 2eqhu)4 8o wtntcpc fgblxx if R increases. When is thicete2/4 g6xco4p b3 hn)+ ur ;wlqtfx8s 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 increa0um*wkyp 4ih6fnvqbtb n* i7g;5o,m , ses 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 thea5u y/)) n8x-gnyaena 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 anbk ee m-yt(x1; LRC series circuit, the resonant frequency(temy;-x bk1 e 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 circui qg t7 ,dlzbf6wefd8-.t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cia+ fl7l cr:msds). ;enk+4u wbrcuit 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 unze 4.fn bpc3j7iform magnetic field of 0.20b73pnc .fzj4e T. Find the magnetic 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 0.10 m isswhi xpt01 f 4c6nsi-cbm3e96 rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o m bs93 wxf 4pscce6n0h61i-itf 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 magnetic f6jhg:t8x l ay/ield 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 angle oflty 8g/hxa6j : $30^{\circ}$.

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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 ad nv0mlnosqtx:- 2p+. pjustable 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 frym9 q1/mp8 zdcom $4.0 \times 10^{-5} \; Wb$ 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 witz e-fktt7nm wz4 iljs.;b81r +h sides 18 cm. A uniform magnetic fkz ;mit.s4ft1b rw -n+ e87ljzield 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 turns and an area o:+ jhlrsgp z4,02jaakf $0.40 \; m^{2}$ 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 andp:kr + hers, 0nt(mg1z area $0.20 \; m^{2}$ 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 fli hj+;wpob ;fzdch )m-(es horizontally at a location where the downward component of the Earth's magnetic fidpm ;o;fjh+h()w zb-celd 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 con/ y +o,6*uusbf4igfoxstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field obxioof6u, 4/+ gsfy u*f $5.0 \times 10^{-5} \; T$. 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 loo++ al ayi u;kv*kw,d rt14yl+qps 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 1kg9uw 0d2l rm d(s+o (0 m+awg:p8yurr00 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 rectangug 10lwv0 vmk7hlar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis0 0hkv1wg 7lvm 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 xvi kh: yx0fi,+5d dh1area $0.090 \; m^{2}$ 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 0*rv*ow)n o kta simple AC generator with an output of 12 V maxiookr*n0* )tv wmum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gener7.z 2i+vol owmator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor x, gg*d5ew 7+fwend7uhave 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 yny2idzs l ;:,resistance of 6.00 W. The motor operates on 120 V AC, and when running at full 2,: ylsiyznd; 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 sup+7eie 2cxb jk6c1jb rwr1)lk7 aejk0; ply. The operati7)+ k cw 2bkb jk10rr61ci7a jlje;xeeng 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 supplgn +me w8hc p;p3xm n0l0*.zmny. The operating current is 1 +p zgcnhlmp .n3* 80xenm;wm0.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is ysio d*.p;uc hwpseuk)0/(b, qtxg. 2 connected to a 24-V power supply. The operating current is 1.0 A at full sp2qpsxe .),isytw (ko0g;bp.uc hu/d* eed. 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 pri h;v;lvy rb5n8mary 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 secondpam8)er6j lg1 w+x sm:a:)asr6 wm +px1jm8gelry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary qo70y :5josk/e k0odux:o/fv if the 24-V secondary has 100 t d/fox k5sqyoo7 :e:/ ukvj0o0urns?

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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 5i8o/+kkoki,w tgea g)qny 0() 00-turn primary coil and a 2000-turn secondary coil. If the currentwk + iotgyg)8 /( aqk,i)ek0on 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. Ast bd)-yz y,2misuming 100% efficiency, how many amps at 24 V can t, m y2)d-iyzbflow 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 o4 tu z+xs;t ih1 yg6+akw1d4omA. The primary coil operates on 120 V. What does the primary 1i+ +wt o;z4ohd6tg1xkyu a4sdraw?

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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 secolzq3 aq4r(6vg;rz :;iy v+8 sxk8ssi nndary coil. If 120 V at 2.0 A is applied to sgy3i;zx4r8(a+lqs ;sk qvzvri:8n6 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 prim *cyiv(cnq9; fary coil and 300 turns on its secondar9vnq;i f*cy c(y coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200/ppiez )e rm nf-,ly;2 turns. If the input current at the p;e mrfnl,zpie-y/) 2primary 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 tuywpz4s w8re y9c7 3e 3e8ku+u*n5wva crns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage y4enu3ew 8 *c 9wzu73saer58 +pwkycv 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 lt z k +dpa18,j.+ateh100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of t+.8 aj,kt ha1depl +tzhe 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 curoyo:e,* jw 1wtvhwbu,r.) b:tuj; w8nrent 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 number of turns in the secondary if the primary has 2001h*8 r .ty):ww, ;woe :unjtvo,wujbb 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 jn g wq0rv3yl8.*yu+l 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power r8+y lnuy*v3q0. gjlw 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.y0 syb5o,qx./ z;v by8 x4befb The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 e,fsq .xb85b4;oyv zb/0 by xyW. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line m1azs5k ro8s*bjx 4sf3m.y-ql8bm : b50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduc4fb :y3a.bssz- mb klm8xj *m58 q1rose energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 oa)gamj3. xbb0mzx6xe bd3c3m z81;rlong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatij3 m3mx.)rxb eao 8zgbb ac1xm d3;z06ng of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-mpft5a 3 uxuu4p9y94qv,.s zfW line at 1000 V. How much less power would be lost if the power were transmitted atapu y qm 5xu .pu43,tf9zs49vf 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is +t3puke0/ peeto be transmitted on a line with resistance of 0.60 W. 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 powe/euekt+p0 p 3er?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in tpmh5 u9y a:sp.he coil's magnetic fm.pus9p: 5yha ield?

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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 i:zg/- u mmqz0uj; /sghs this circuit's time -uu/mhgs j;gz:/mq 0z 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 -8c5(antkhgj2hfcpwe 07 ok, circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outletic* d sbm-9c)z)ekwse.f ex+.. 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 place eyt4(:r 4mzdq 3k6-nxzvcmo *d into a 120-V AC outlet. What is the resistance of the lampdq(v4*t46 - y3r mnezmzo: xck?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the,vf3zv;o s8 jd;pzfr7 peak current through pj837;;s,ff zrvd vozthe 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 connectedg)rz a a+wz/ o;9ff*mq to a 120-V ac power supply. What is the power dissipated in the w /gqf 9mo );z*fazra+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 resistor 0jqohw t7g/filmz231 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 resist a9/ scv3qfv tx(k3iyzc+ t;o3or 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 re8b)ykk p;ym8v sistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor tz7;z 6tu.q zhat 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 coil iob x*vd700sp ,l.jfiat 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 reactancew5 v8y-.wfcbmvm )eo)?

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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 o hcys+s(6yrhob9 +jbxr 2e0 .mf inductive 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 bpmw(b) *t+h 3fv.kqh V AC at a frequency of 20 kHz is appliw)vmf p (3.bht*bk+hqed 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 vxr0t )fu-fd5 n+*hhy . mk0rato 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 capa s+u2: 2eru78j sjlnvncitor 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 caph;:ns:m xl mpqo- ,; v8dcc8juw(yy*iacitive 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 10dz8zx),ql(k3k/ f fra-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reau 9pl 3 2uzidihcu39g2)0mnjo ctance of a 0.010-mF capacitor be 100 Wpinu u 9d3m2 uz)90l2hg 3jico?

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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 thro*t2b 0h y2rxfrugh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac seriehii f.( 7sudkax (fw:0yz2nw ,s circuit with 12.0 W resistance, 15.0 W inductiv h7xnazsf 0 wiu,kw(2.f y(i:de 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 fjnye73xcr1 ,s/k/ 4leojg6 wat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connexlw n, r/ojcj/ es 741fgkey63cted 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 1500sct;x/,c av bh0k7zj. Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connekh;z0sv,act/b .x 7cjcted 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 conne.3/ ukbvb5tkd.1 vn 5ud ygu-mxg6d-1zoa)y hcted in series with a 20-mH inductor, what is the ixou )y3g u.d1nh6by5/dv.-1-kb5mt vu d azkgmpedance 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 zp;o;po32 nk)eq h4kp q*in e/in series with a 20-mH inductor, what is the phase angle at 1000 Hzo)*iqze;k no32 e;pnpqkp4 h /?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 0/d**tiybrywa3+b; h m58w epz , ozmp1.0-mF capacitor for a total imp pr wy*z ,mh8z+d;ia0w/ pby bo*me3t5edance 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 seriw v) c/0;ya,z tyrwfa6b(+a vx qkad*8es with a 100-W resistor and 15-mH coila(yvqc zw/a )6f*ad y ,kv;atb+w x8r0 to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor ahym/xyuds f5p/mz5 1 5t 5000 Hz for a total impedance m1ud// fz5m5py5sxyh 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 fd :0 pzsz6mnnrvovjs. .3uy .e4 sd,3for a total impedance of 150vz sy3 r 4.o 6ved3mf.n0nd zs:,u.sjp 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 cap ;w9 uu,aic*evw y3g/qacitor. What is the impedance a3a;yvw/,uuwe gq* ic9t 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 at f*l)sd,gi-. t:kc d5za tyxz6 1.0 kHz for a total impedan :z tcaztxdy*-g klsd5, .6)ifce 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 1.0 kHw )qoh,a c*k +4ysbffwyp.-y *z for a phase angle 4 +)cof- *fyypsba h.* ykw,wqof $40^{\circ}$?

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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 r-b8lz 6 8-cxjqip c4 ,flnenb.esistor at 1.0 kHz for a total imped4-n8.bjl6z8iqlbnp f xc e ,c-ance 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. Whll1xuc30m 9)vl 5q rv cbd*p(xat is the phase a 3x(5qux vvl01bdc*c lmpr9l) ngle?

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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 rek7)x5 yrx b;0m0oqx-mH coil, and 1.0-mF capacitor are connected in sek;me0x xryb 7rx0) 5qories?

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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, az2fgj,v:s ln 9zt9w 6h 10.0-mF capacitor, and a 0.350-H i v j2hls9z:ftz6, 9gnwnductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitivlnz+nlli5nm3a5e;/-f- ny;s t e n9jhe 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 f ntlen9n-hsn 5;; m jin5efyzl/l -+a3lows 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 containinzx0k*mind+h;h6m5/iul wm e(t 1 s5csg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when chxmmzhs5s*6/lukn5( + w d0im1tie ;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 sek i6)ga l:qsn:ries with a 500-W resistor for a phase angle o6n s):al:kqig f $40^{\circ}$ 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 d: vrp+pnh-d;; fj es-W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit bee;n;v jf-+ dp: -dhrsp driven in order 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 wik5+x bnvb+t0(l7t;m tr/4ihpy f lji;th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuitl;/jx5tht+ pkynib0 f;v7 itrl 4+mb( 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 zr: 3,; qpdx0ct tf,qmAC 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 impedance of 60 W and a resistance of 30 W. t +dn 7u7fqzzi ,pb/s* What is the pn ip7u ,*q 7zdbszft/+ower 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 cotv /wcm8ug z0*ntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powg / vzm8*0cwtuer 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 g t9 hwksexdr9)x32v/ and a 15-mH coil in series?s/r9g e kt9hvdw)x32x

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne v :xgz9ycf,0weded in series with a 4.7-mF capacitor for a resonant frequency o wv:xg9fycz,0 f 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 seri; xkp06 xe2jeues with a 3.7-mH inductor for a resonant frequenc epe 02xj6;xuky of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series kflxu(8c )b*(xp - dlo 2kume(with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is toxef*u (m x )bdpk(o28clk lu(- be 1000 Hz?

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