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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://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://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 of3 c19 vmc+r zigwz)sip)g,ylx(.hp5b 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 stat7u lz 280nj;g4wlck ndes that the $emf$ induced in a loop of wire is proportional to

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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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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 cho+f . erwol1qf1 uu-6hange on tuor6 .h -uef+fw1 qo1lhe 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 magnetic field through a loop of wire producevphpd5:93o2kou 4p6 vs vv ng9s what kind of change on v u pv96h3ks: pnd2g495vopvothe 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 lc.7y7vy a 3kur1jfv3h oop of wire produces what kind of change on the indu3fju k 3rv7a7vy.hy c1ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field a-wfo.a(g5z/wk za q 7ln $emf$ 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 di/9gi2 : mkremlaz; vq(rection of an induced current in a conductor will be that which tends to produce wg9ma;v/ek : r m(lqiz2hich 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 ejvyv,.t;k)k frs *sfqjx-xo 1u ncal9 *3t86on a horizontal table. A bar magnet is held above its center with6uv*c as ks n8xlk t* t.j-;fq1x3)yvrjo, fe9 its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i h81k,q lbac*3gjuup 2ts center with its north pole pointing down, and released. As it approgu8 q b hj*1,k2pc3ulaaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a retbj s4aym- ujey kd1:n8s(y9;gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thi4j9 :yyay js msnde;b1utk8-(s 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 mhoc py7/q;v 3a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whenc/ m;h3qp voy7 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 th,- hc98ji5vtulxv /cf e magnetic field points straight down. The magnetic field disappears suddenly. When vie,9-/vl5xhccvjf i t8uwed 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 carries an ever-increasing uqaj 9q v9hn;75ome)ki(; n0xb b5drrcurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current ci( iqbnodu h;jrnvk5mar 0x)q;be 7 599rcles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wi/6 pj ly xudr kj43+ 009cv-nd0ggavdrre with the north pole entering first. As the n3 rc-dd 4g v+d0l9/6ny vjkxar0pgj0uorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated am ue b3hzcu3 .r25br:j+btgg* ci)2ac t constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation b g 2r.jgc+ mubbct3 a:z*2u crh5i)e3of 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 speed about an axis whose 5 eiaiao* 58bjmg99to direction can be varied. Inetgb*85 a 5o9ii maoj9 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 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.yl+8he(i70+u nm+xt7w kj6l,wqou si21uony
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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 y/p d2kpaq,e3; sriwpt20 x)dthat 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 magnlu1 +secn3g8betic 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 (orientxdte7no 39 h*ked in the east-west direction) is moved northward at constant velocity through a mt* k7xoendh9 3agnetic 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 9scxg +mhtmj8*46 pad 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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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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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfozt4ubgi; m 0-grms

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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 th q(-.d t; jll9g.y.b twz mm;wtp8y*zdrough 60 revolutions each second. The frequency of the .dzmt ww*tz;(llbg.jm;-d t.8 yp9 yq $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t 7, q9rmhgl*o)ua/l.ye ukwj(o

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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 device0 xfd:c; fhdbb2dp90z 4im qm+ 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 than the prirvje4hb1 /m6d(yaos qc)7j,f mary coil then it is)vj7e1y bsfq ,hr/d 4oj6am( c 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 loopsh (iku+i*b x3o than the secondary coil then itx+b h k(ioui*3 is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpun qqhak;l4e kvi:2d 3-t

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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 resonan-q zl qbw,l/f9t 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 series to an ideal battery of co;jzi2yq ipa*q4f(y9v nstant terminal voltage. At the moment contact is made with the ba2y ijiyzafq9* 4vpq;( ttery, 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 connected in series to anl*tovs,y: a o;+yfk 0f ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the vkf,* yyoftlao+ 0:s; 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 indugkas+945l(ligyd/ kl v: d:v7gv8 s32j wgrj nctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is con5q)o o,q8 wd7uz)leaf nected 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 in series to a battery. The t: nho. hsa+ff tx-6*otime constant for the circuit represents the time required foroo6t*sf xh-n+f ht.a: the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery isubhu3 wm/n1q c(lofr5q, s53 a suddenly removed from th qq5c3b5h mrwu(l 1,oaus n/f3e 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 r a rtds(e** e83rp3e2 9ey7rriga4n2non z+p same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. Onvi47peyb ,bkhl 3 lk8yi4( ,tn 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 Aqok;,0ine5 -ocyj538l tfopombl t11 C power supply. In this circuit, the currenn oy38q tfobij0oe ,l5l115p t m-;cokt

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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 circ o1q(zp*wqbahp 33 (* bt(6lrrsxq9pcuit changes by what factor when the frequency is prrb 9qo wsb*1z6h((3c(l a3pq*xqtptripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across id 9u1xs s:cggzb(j; *an inductor is doubled, the inductive reactance of that inductorc:gx *ui sz9(1sj; dgb

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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 h dhzb*idx+:(across an inductor approaches zero, the inductive reactax (ihdbhz:d +*nce 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 suppm cud23i) 2 clh:sqxr;ly. In this circuit, the currecic:xq)mdurs 32 h2l ;nt

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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 )dhb1*i.e h jwfactor when the frequency is tripbwih. d1e j*)hled?

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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 azzr67 rylhpr)x.; r x nc64woz( q( 4n2okd+tm capacitor approaches zero, the capacitive reacq;y4)owrz42nnp .z7(rx dhxk m 6l 6o z(r+rcttance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between tk6 dtz xqy9+p)he voltages of the inductor and capacitor in a RLC series cirqz k +6yxd9pt)cuit?

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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 circtvc.9if001tktyy +r ,o stw * yel(a8juit 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 isb/ra-,hc9y.z . ovvk9 p qm /m-mtt:nmpedance of the circuit increases if R increases. When is this stateme n /m.phzk sy.a9 v-bo, v-t:r9t/qmmcnt 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. m l/bg lzb69q(The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases i dia, xln(-32u0 hrb9bmn w+t8wk2 gzcf $X_C$ 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 ther6 5xjzsf;rjq2 ,/ynv capacitance both double in an LRC series circuit, the resonant frequency of ,j/ qrn; s6jzxyf5 vr2that 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 resonance8aid ao8vh f6z4b /v+ uqe,83iwst3v r,

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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 ctgv-d 0 ,k*booircuit 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 ma4q5 bmsgpn+ j7+b * rhqv1c05ffk smoex4;rl)gnetic field of 0.20 T. Find the magnetif)c q f5k4 b+;s5hv1q lp+sox* 7m0nbmjg4rerc 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 r1bhp1 seojn 1nhe() 5kadius 0.10 m 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 1 )(1s hkh1nn jeb5eopmagnetic 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 field of 0s8 hyoqa2u:qup1gs8u7d n b2,.20 T. Find the magnetic flux through the loop when the plane of th7h:nu8s bg2pd,q2uo u1 aq s8ye loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjuus0);ubba *y by:mm(lstable 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 fcm* o:4*)) wbjw sqzthrom $4.0 \times 10^{-5} \; Wb$ 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 * b7 s fflbvd:n7jnp9-a square frame with sides 18 cm. A uniform magnetic field is ln p:97jfdv-b*fns7 bapplied 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 areao +f ;r/ws4itbq(y6vc6p;w ii 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 an;(s.l h;n 6cc,rk dxyxd 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 ofh0a+x jl hvs6udzt8 u-, yk6y7 60 m flies horizontally at a location where the downward component of the Ea v hu dtkyj,l6zhs+a 86-x7yu0rth'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 5c/ -g4x0csy a* eizlnife 1 ox/ge)x;rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throo05gcc4zsl xgei/-xa;iy e/n) fx1*e ugh 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 loops and a crosc ,hfb50p:qphec g85 us-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 wire o,tins*cw k 1 bc(qqk9fuf7z 5 1ytm+v5f 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 loopga0i(x8+w/9 kvueurbd:wd-r s on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abo gi(9rd/ 8 ux+a:-wrk uedwvb0ut 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 g aglk ll5b: nf8/:w6jof wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct aq9es.h58 s p7(xhgslt4v2sqa simple AC generator with an output of 12 V maximum when rotatedpg 2q5asshh.8el4x stq(s7v9 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 generator with a qk*)i6:gk fr;y -vepmmaximum $emf$ 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.i:iiz( fh).ve-to (8eye f p)a00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The m i1fxcx(862gr svcn8lrj+g w6w e0 i*aotor operates on 120 V 0jcw+rxa(6n*s2icglre iw xv816f 8gAC, 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.xupnu/d hp qsw w- u;:nu0/p;k7d,;zc0 W is connected to a 24-V power supply. The operating current is 1.0 A/usxu;udz,-cw q p 0pn:d kwn/7 h;pu;. 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 conneo r9( c3vxbsu(cted to a 24-V power supply. The operating b3(ucv9xor s( current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2b(,y.a).t me nk:mjss4-V power supply. The operating .(:mm .sse ,yjtn)kabcurrent is 1.0 A at full speed. 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 92j kr p z8rcf):fxxnwd/j0e;+0gepgof $120 \; V$ 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 flo :rokd.gr r:c+w in the secondary. How manyrr:.:rg dkco+ 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 a464 h1jzo um ,ms)xyr)hp2n ty 110-V primary if the 24-V secondary h )jyypt4zr)1 6uhms no,h2m4x as 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil anchuhoofd8, jx ;y9b/8d a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current ind;f,/bj9 8xouho ch8y 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 xc 6kj+5 q.b5l9jvgvi. Assuming 100% efficiency, how many amps at 24 V can flow in the sec.k jvq+5xb6 9lgji c5vondary?

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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 tra i if56dr-bsavgc 38t. kp2bj7nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Wbcbd8-j6fki 2ri v. 5sp g3at7hat 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 secon at/asu(u,l 9h6n2oh y7b7p ttm 3f6gadary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the p7og2hsf/6ytb ,ua67 t3 t ua(hl9anmsecondary?

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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 c sqevr;b-iz-spn6)(a, rl: 8fn glf 4turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri,v6;8qsb gr:fe4-nfl (rilnc-z a s)pmary, 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+qt+g,2n9fbe com k1*gj gvk- 200 turns. If the input current at the primary is 100 A, we can expect the output current at the ogg q-vek2jg1+kbt,9 fm *+cn 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 snag* c7hbt3 vfu+7jj/ econdary has 200 turns. If theb j ahc7*u n+jvt7g3f/ 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 hasb: m8lmv /-wva 200 turns. If the power input to the primary is 100 W, wb:vlmma-8 /vwe 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 usually stepped 8gb x9js7ux 0ar 4ty,bup 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 sectx0a 9 yu47g,8xbsbr jondary 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 voltage is u /-b brd-xz y..ll)qmysually stepped up to 4500 V by a tbxdy-b-z. ml/.rq y )lransformer and transmitted through a power 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. v oro)s17hct(3lix) fThe voltage is usually stepped up to 4500 V by a transformer ansx lr i(ft7)h31oco)v d transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc)(1hu1yivc, ,z5h wfxvd2hm oe of 0.60 W. A generator produces 100 V at 70 A. In ordehxz)v v,(f1hcd2w , imuy5oh1r 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 original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge l(l6h1:.e.+oud glk u xuwcj2nerator 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 origina u(k1 +u.6lo.edg2 uxhcll :jwl 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(mor ghrp:5/c. How much less power would be lost if the power were transmitted at 3000 V insrgrm5o/ h:cp( tead 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 to be tranv ov dv:l;yyu 6-e;gw8x gi41msmitted 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 0.0mo:v v841;wggedyv6u; liy-x 10% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is sip7zo ows(4 c.tored in the coil's magnetic f7c .i4zoo(wsp 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 con+;c+7oa9pgu gfq2 gl, h.byrftains a 6.0-W resistor and an 18-H inductor. What is this ci2fl97;+rq +coayf gghup. bg,rcuit'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/k yr zvmy+k:; an AC 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 outlet.iu9,22bmz1khqp n0dk What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thsyv*cev**o 23*vaqj1ei.wyu j7 )i l ce resistance of the la.e*7y2*i1icu *v* l y3swe)ja qojvvcmp?

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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 connec ,mhs3e6: ,dxir1fhprq (2 ygbted to a 120-V ac power supply. What is the peak current througqb,hr36i:1(m e gs, y2rfd xphh the 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. What is the power dij f prgb 49lx/ +.fnpnpyi4*1qssipated in the rr1bqng+4 n pjy. /*lfi9p4 fpxesistor?

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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 ret :2:6.t2)o ysvyd9n3aneu0floe5wactb k3bsistor 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 resistor ixbg c.gf7c/a0+buth( b(mt7 rs $I = 0.80 \sin (240 t)$. 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 resistor iy7-kga4qf r1 jrlo/0d s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzr tnd xk.;f7r72;ksp/1lphaz ?

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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 reactanml20ahmmn 8 1iih1jv/ce 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 6 n)a/+hqq)haw tae)ypxj n/8of 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 ofmj 6idqs*cny n/f88wgz+a/ui/6bf m8) hf:gr 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 V AC at a frequencywxnjpv qd99 2sxwf/*7 of 20 kHz is applied to i/w 7xfvx9*ws92p nqd jt?

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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 0rr+)2l bg79j:tp0i uaotgcmdue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cakwkg812t rdmi : cfp-.pacitor 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 reactanymfv )cph;aq6(8qxt :ce 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 reactance of 1200 W? tcx s11p. n-em3l87llhab7nq

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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 f 92dfrabd 8m8the capacitive reactance of a 0.010-mF capacitor be 100 W r2 bfa889dmdf?

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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.xp4v6 ryav9 -* p*ohoy0010-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 series circuit with 12.0 W resist2(m.y6opn:j tv5vgq eance, 15.0 W inductive reactance, andv6 etj gm(.n2qpov y:5 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 u ah*ufu,s5v(if a 100-W resistor, 20-mH coil, and 1.0-mv ahuuu*f5 ,(sF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 16( ck6yvade b.0dr1fr.0-mF capacitor are connected in se.v(d6ey 0k1 f rrad6bcries?

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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, wz f,w2 -bnvc37eko; iphat is the impedance at 100n bf-ei7p3vzkc2 w,;o0 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 with a 20-mH inductor, what jixj/hh7et+l- k: ) ihis the phase angle at 1000:ijh 7 jth/xe)k+ hi-l 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 seri0jdtaq0:vu3p 7fn /ices circuit with a 20-mH coil and 1.0-mF capacitor f0nv:i7qa0 pjtd3fc u/or a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances isvcxl252 +. f cnq mz0(wkdzp6j needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W wm+(2x flqzd5j. 0zcpvc26knat 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 50 mlvp4ttriwb +x2 /+i8lye+,h00 Hz for a total impedance +b+i/+wx ipe2vrl8tm t4h y l,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 0liia 4lvwcc1 oogz )0f7yp5-sl-hx *100-kW resistor at 1.0-MHz for a to--ly 0l)lg zoaxvi41*iowhp fsc5 c07 tal impedance 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 capacitor. What is the impe g2id(g4 piomn8jj1w- la 59akd1nilw9 j (2p4adojg mka5i -g8ance 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 at 1.0 kHzbzy (j1w pf 9pfmz77-y for a total impedancm(p7 fwy zzy 1b-j7f9pe 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 w *izzo/x9lb7 -;urrv vc0 l6phith a 10-mF capacitor at 1.0 kHz for a phasl zrz-7v* xvi 6obuc;0/hlp r9e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a od 5bdp15jsk- total impedance of 51d p5jbo -sdk45 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 p yg 0c1trb36gb)u diy/yy+ e*6txh h/a 100-mF capacitor at 120 Hz. What is the phasbtcy 3*6/g0yur6x1hh)dyg it +/ bpye e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resisto:k ega-e:f(a aw l4lse4 (pc.ir, 20-mH coil, and 1.0-mF capacitoep4iake: :a4ge. ((fcas wll-r 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 re,yl ,ui:esu56 4pc cj,7 e2jm4jfshstsistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the c,sf,64 pcjsiu 5ctelmy: e2ujj ,7hs 4ircuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and hdr ocm*9;xt :h . jkcnkip2+i3:vk+han inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cirv.r9dk3jmh: o;i t *x ck:phkc+ h2i+ncuit?

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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 cont/o dm(1a2edlp:r /d zqaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecteo2d pe (rzl:q/1dmda /d 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 resisto;s l-;meh245cjusgo/r p s er*r for a phase angle oj5c;erl;/os -er s*s mpu2h4gf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, tlwyw 5:w2md3 L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order w3: wl 25dytwmto 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 outpmi f*.o*ai9:piko 6vpzw( m,cut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W *p,.ow i:pvmi*cmk9oa z6f i(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 cbq6q(q4huq+fhki yv 30.9hd nircuit 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 impelv4e m/i*m9s8h4gh/vada4b e dance of 60 W and a resistance of 30 W. What is the power factormsg/l b 8eh4av4v 4i/edam*9 h?

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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: *po*y oxw/xpbs:0 0mkat ey) a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60:ty)ypb kpm 0oe x0os*xa *w/:-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 se-qdej6h(w q(7v fi9vyries?h (y 9jqie7(-w v6fvqd

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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 seriecppsb,tqy *7 v8g:+iwewh8)m s with a 4.7-mF capacitor for a resonant frequy:,qv7wm 8sc) phib*w8 p+tgeency 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 nexk3jt :o4;un aeded in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz?4;n3kaxt j:ou

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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 with a 30-W resistor and ae*-r*1 1xn w b*utselv 40-mH coil if the rew -se1el*tn*bu *xr 1vsonant frequency of the circuit is to be 1000 Hz?

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