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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exj c2k :zfho)*v.s0)zq x.vix fjd n:a/cept

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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 induce7 9kxe:- pae2wm; seition 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 what kind of change s 3 9h4.yposz / 85ujbuojs9ekon th.j/e5 jub 3zs oohypkss98u94e 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 throunk6s/ 7d1kpc (-x z nlw)i5iu:gon8sogh a loop of wire produces what kind of change on/xo p k5d7 81lwc(sgzn6 : sk)inu-ion 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 rxgr: ui:q8lhej( qw;+ kxoy7;+tb4tkind of change on the induceq j;l:hx x8u +ri;q 7k:te( y+rgbow4td $emf$, 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 aae:( igbul+x: pi;v3z magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, thvfu9gq 8w+o7ugjz c7d6z i.,r e direction of an induced current in a conductor will be that which tends to produce whic896 vqgczwfg .77u ruozd, ij+h 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 lieskdpzrmee*/ +i p8l- 9m flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abielkmzd8+ m */r9-p peove)

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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 9y9pylgn9qq/ /zlo7 oitvl bpjh32,; held above its center with its north pole pointingpo9l2bnzy99 3pqo qgjth//i,l ;vy7 l down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where t y/7evk: aao.ghe magnetic field vector points straight up. The magnetic field vanishes suddenly. o7kav e.:a/gy 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 inugk*umf-/w .5v p7xpo a region where the magnetic field vector points stu/ .xp kfwg5-o*vpum7raight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field,osigo/mcymx xn16/i r99z2d points straight down. The magnetic field disappears suddenly. When viewed from abzgimxm1 ncyx , 9/d2 o/9sroi6ove, 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 8oc1 rum c7o)c6hi, 8 pegohg*mr2u(llies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat onuuc)8ool 7g* 8irhr6oc 1ec(2mpm,h g 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 through a loop of wire with the north pole entering fir* lde q1bx5t:ost. As the north pole enters the wire, the induced current will be (as vieweqdb1:l x oe5*td 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 rot5 vmm5-t9u4fq:i rmwl lv8d*hated 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 the orientfvm *illuwm8tmvh5459:- qr dation 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 co y8uv4c7k*iklnstant 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 of the loop's axis of rotation if the inkk u7*yc vil48duced $emf$ 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.dxu 5 0gt*wd-h,g ,z)/vftsif
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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 an (c* r xqkyt)rt4re1r2 $emf$ 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 k/k0ykxylx 0euo16;cd. 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 wyxc-xok+ 9afz/6e*x -west direction) is moved northward at constant velocity through a magnetic field that points straig+y*-xkefcx w axo/6z9ht 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 angular velocitbk(;x,9 u2gsn ) 6jkrzlo ij0oy $\omega$ 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 t/xv3ei-caww k2x*tt :e2f+(- jo idlsransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each nfrh r*7dn2p( second. The frequency of t fn2(r 7p*nrdhhe $emf$ 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 devicee7/ u acihuf.* used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thafdkj7jusmirg0qn0 zq 66ks7u + 3-z wgh-;n p3t

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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 secondarye+ xkw3s3isj)2t g 2kn coil contains more loops than the primary coil then it is wns k2 jk3tig2e3 +xs)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 con8l xc, x60rq q;ppt8)tap0xl itains more loops than the secondary coil then it0pp8tri)6l tx 8 pql;xq ac0x, 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 aya qljoku (3/lk7rgj*n,79 8cc vd:ginput

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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 f n+ly(6 ds1ynjh:vm8circuit,

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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 arc q v.rxk-(wl/e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batlw.q-(ck /xr vtery, 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 an ideal battery of co5f yjpgp +t/d0nstant terminal vo pfp0/gjt+ 5ydltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectegy 29;yk,abbgqam )wudo ktc oa(*-:3d 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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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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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit x:y:am sp vlm8wp01l* with 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 series to a battery. 50hrx+abef-8s. /agqayxm n 2The time constant for the circuit represents the t.a0+sebgfxma-xrn y/5 2aq h8ime 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 conu2t sn:zkip z ;epk )pz+q09k(nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requireduzk2t ppnep (9 +z0k;iqzks :) 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 t crw vaoo.f9 9p.opp/2he 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 a us3iyi,fr 002atf8 /b *rxekzn 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 s4+3c 71.4 kceveapn2venzsb jupply. In this circuit, the currenbz4aev k 2svc.nn7 cep43 +j1et

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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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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc0oc0gy 6tx yl8e in an ac circuit changes by what factor when the frequency0x c6o8y tylg0 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 voltage across an inductor is doubled, the o*mq qtgj)- 9t;: dscugs4 rm5inductive reacrm-s jq;c s )qttom 5g*u:g49dtance 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 t1ftkmr; 1dl l.he AC voltage across an inductor approaches zero, the inductive reactancf d1r lt;klm1.e 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. In th k(:*8qqe4-gte hzvaqlj2:/ced ,aqj is circuit, the curre jca8kqg/2(- qe :*qlvzj h ed:4eqa,tnt

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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 factadep24d7crqjq 64 4 zaor when the frequenc4424eacar j 6 7dqqpzdy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, thy:lva2sgne ; 50) roov+ eenzpit: ub.18:nc ae capacitive reactann0nlo 8: vei 5sz2e b +taepgu;)aoc:v:n 1yr.ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in ry2fb 3 -;nyp8u dbnr3a RLC series pbr8ndry3 -2; ufb3ny circuit?

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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 chbub.299:afiekl 9 il ircuit 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 ocm 9*ig t6hx(y.qw1lyf the circuit increases if R increases. When is this 69iqgcl yxw(h. 1 *mytstatement 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 osb2jg1n.e f1cf 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 increavyv (rd6p ti62ses 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 ssh9* /6 ezp/ 5 tm/fqlv,dsu0o u 1ddraw,8xhthe capacitance both double in an LRC series circuit, the reso08/ux/hp ader,tq9z v*ds6 5oh 1ds,fmul/ swnant 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 resonance, .zb2 8oc5gqtn*66kjzm osku3

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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 ll1s 9k5guw6rRLC circuit 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 unifolv 0wgirhp fw+(j q-))+wf;skrm magnetic field of 0.20 T. Find the magnetic hl+)q vwpr;(g0-fkf+iswj)w 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 is rotating in a unifo((,zwh 0 qe1jgmy3ufwc x7; ckrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop wuz73(1(; ewg k yhcj0cxmqf,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-)0blw5ri1eh*m aa r g is rotating in a uniform magnetic field of 0.20 T. Find the mah )-0 wlega* mrr5bi1agnetic flux through the loop when the plane of the 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 adjustable single loop is reduced(sfgm)b (+c mf 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 cgz egn9;giez+2; y 9adoil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square f*dbwxj0+iy1 m rame with sides 18 cm. A uniform magn0 ix1*dy j+bwmetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wireyy *vmj6 ki3if(c s(x0 with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arean12zxc9k3s7iy ltp6 n $0.20 \; m^{2}$ 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 horizontally at a locat8q1auxr c0q e1ion where the downward com8qe10q rxua1cponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 5: afs6bn d3y mzpq/x62.0 m long rotates at a constant angular velocity of 2.0 rad/s abo mq5z6bs/p36y da: xfnut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops t(7: wnw:ydyizb;8fw and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turn.*tah9 el,jvns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular lo1gq ) 7omyl+ yiz..abj;.knsa ops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. bn azyal sig..y 1q;o.j)k7m+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 ar)fg6,5sclu)ie p gwvsg. i*u:ea $0.090 \; m^{2}$ 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 const762mqjhpxqhc+syn6,;0;s ( l jhw m czruct a simple AC generator with an output of 12 V maximum when roqj,psm 7mh;(xcn+6lch 0qy2hzj w ;6s tated 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 s5e)28xoo zg emaximum $emf$ 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 67 j jr6d6ch7u gkay8u,.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 c d8 y0) rcbzjmrd3zsn:9ks,6 resistance of 6.00 W. The motor operates on 120 V AC, and when b ,:3r 60sjd98m)d n yzcckzsrrunning 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 po:.lf:3nl z p/p ndszgp*j 9li/awnsp5m.r. k:wer supply. The operating current is 1.0 A. What is the stafngz::p/jm.:n 9s ais5.3*k/rl plzp. pw lndrt-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 reoa3kaml +3q+h 4t tic t;qaa:lgp9, k4sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fulg,k +am;+:qt3a atai9 p4ck3l q4 lothl 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 connek54vvzer*5kw 21 uu phcted to a 24-V power supply. The operating current is 1.0 A at full speed. What is the 15uw*2vr4u e khz5 pkvback $emf$ 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 ph,tcqii8 wg2x kj3,7of $120 \; V$ 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 ca;vxvdxnt,qk6)n g8j u0t/ nf5uses 14 A to flow in the secondary. How many turns 0/udf,xv tn5 nqjgk8 tx; 6vn)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 if the 2- ap z7ybqh4;x4-V secondary has 100-yzp4a ;q7 xbh 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 and a 2t:3x3g dg ye un9ql+ve9,d/n d000-turn secondary coil. If the current ienvnlx :q3dg9 dge,u/9t3y+d n 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 trgx2hd2nt,n04g qmep8q pc+/a ansformer. Assuming 100% efficiency, how many amps at 24 V can flowmt 0,xne4p p cd+qgq 2ha/g2n8 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 transformee3t.5jt(3m wxhut )vqem 4od1 r provides 7500 V at 10.0 mA. The primary coil opxo(tj1euvqm4 m 3etht35) w d.erates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 6wwt4 -3f.gavs 0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?ws wf-t34g. av

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 txe6kg8f: f3ghi0g *t jurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is p6h3ft0g xek ig8*j:gfresent 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 hasoa9sc2 q,turzdit 278emg po+ w2 e5i0 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect thtc ugioezw+p5t2d qi 0 82 9,e2rsma7oe 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 200ih f+mea3t p1y,h7jg* turns. If the input voltage to the primary is 100 V, we can expect the output vopt, yjehmifga* 3+h1 7ltage 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 transformex8i6bo:pl 1g7w (to1ap+dcg fr has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpuoopwdxc8pg+6 t1gbi1:l f(7a t 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 1xbo4p, ta,1ja-zs*f d20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total reajopz- xb4* s1,aft ,dsistance 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 gzo+g*hew, mpa1lc wn-m/5 ;zV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line ofawgem/ z, ;ozp-1cghn 5lwm+* 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 voltage is usually step 9w1nle 6d,v9exo9zngped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find w91evgeo,9nl nx9d 6z 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 resistance ofkqzc2;8quz ,qlwmh 4z7/gysf6tw 3w - 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 o8u237kq; , thsmw/l6qzc - zf4yw gzqwf 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 liiohu k y* .g87kl0q)twne 50 km 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 v70qih)wgto ku yk8. *loltage 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-W line at 1000 V. How much less -v5j-x. rvmp fpower would be lost if the power j5 r.vxv-m-pf were transmitted at 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 *otz)fd ks :q;at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfks):;zoftd q*ormer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coil4(9e.4y dqxla gb x0rey 1uu-g's magx9byu 0-1xge4grqd .a(4 uleynetic 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 f*3xz0dy z4nuf(cei/qr i5 --v k9xlsresistor and an 18-H inductor. What is this circ3i5xli 4 kfn9x*e(c0fsyd -uzv z -/rquit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wherdzoio pr s533)e 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 oux upj; n,,j/umg92t 0cnzvc6 qtlet. 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 the resist.tyrk;lr0 ( geance of the lamp?r 0l(.eyr t;kg

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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 suvb5a;6+s,qz1)vfskc e1 jvq spply. What is the peak current through ,qvjc6fzb1+ 1svs5ak);s vqe 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 thepwn ei h-53b.y power dissipated in the r.pni53hw-eb y esistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through arp1uugy/g o2)0 h; ekg 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5 6kuttsaw( rty9c ka0vrkb4r. .1o 49f0-W resistor 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 res. wxwlob;ai2l7(- /u0dk moc vistor 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 g m h6t.bj1 5(tqw(rmaa 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 reacts s;+8 qehhm mwes633zance 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 wilwc ep(l+ tek(d)4h .jql 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 inductive reai/u8qc6lcs 7ypr)l b 3ctance 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 f 5jz(in1ky 8qrrequency of 20 kHz is applied to iykniq 5zj (18rt?

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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+dxa9d,ov 8u ;q mg/kz-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive re 6de:tvgl uq1 tu6c2.vjqv4s3 actance 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 pywnzx0 i 9pp 3zm6xq.*b63mjreactance 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 1)a8inn c+) nkt(e *dmw0-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 reactance of a 0.010-mF cap in sp1,9x5 d6grnt:mpacitor be 100 Wpd9r, tp1mgs x:i nn65?

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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-mFgizt6k.(a-h:bb-g u q 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 circujxs/48xkeo8c5po b/ sh4u, qfit with 12.0 W resistance, 15.0 W inductive reactance, and 1sj/8 hu5ckpqf 4xob4 o ,8sx/e0.0 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 i67cwdmy : qy)ff a 100-W resistor, 20-mH coil, and 1.0-mF capacitoc:md)7yq yfw 6r 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-jzi g o.5c )eytf:dd9o hf5,j 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri.d :d i e,johfcyg5 j-z9fo)5tes?

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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 in.s1zabs x u zv:77ahbi3dy 17lductor, what is the impedance :.zlia 1 1b7vh7 dzx7bu ssay3at 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 ser+zda0(h e 5x;fh j8kva0ug,hvz i(6 lhies with a 20-mH inductor, what is the phase angle at 100 aehha;hf0gx+dz v(,6j5k(vzhli8 u00 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuf8aohp zgzz/avhh.q d .0r95 /it with a 20-mH coil and 1.0-mF capacitor for a total impedance o ./fraq98z5/pdazzvh g .hh0of 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 series l)g)xpkvn f+ay/7 ud (with a 100-W resistor and 15-mH coil to get a total impedance of 11u)p)da 7nly(kfv g+ x/0 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 (wa0tzfo4 4* 3eqmii.xq jx .xin series with a 450-mH inductor at 5000 Hz for a total impedance 4. exqqwfz mi.(3o* ia4xx tj0of 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 for aqo : hzx6jio.fb4l.0z total impedan64xzhf:l b.o0oqzij . ce 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)e ag,re0u7sxd t 89tf. What is the impedance atf9t ,eu tr dg08e)asx7 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 neededbx ll.c* 50 msr)zaiv4 in series with a 10-mF capacitor at 1.0 kHz for a total imped5).4s0clmr*ix lb vz aance 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 set o e0svm,ugno,.zf35 ries with a 10-mF capacitor at 1.0 kHz for a phaseuo,0 s3,m.no g5tfvze 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 )n6mx k xn;qe(total impedance of 4)nmx 6;x( qekn5 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 capacil8 he0ta)fx0 qtor at 120 Hz. What is the phas)8halt0e0xf q 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 y 9ca,(8(1 2sym1nbum qcarvvV and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con nqucmyc21 arv(vs9yb 8a(1m, nected 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 104t5 *ioo tztm- /g p dfmp-f(+e*gx8vu.0-mF capacitor, and a 0.350-H inductor. The circuit igoptf(meigd * f8-u*t 5t-mp4v/ zx+ os 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 capacitivedj( vd wfm/ j8xm5.7y53lwr3s0 dekfb reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-xvws 5 (yd/f07jw dkj35mr83 .f elmdbV, 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 containe z. ndme) *+ mqar:uaicx68r2ing a 50-W resistor, a 10-mF capacitor, and a 0:) m daz86 merr n.*+xqauice2.45-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 h (5k.3 lwtbchseries with a 500-W resistor for a phase angle of 3. ktc5wb(h lh$40^{\circ}$ 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 has40uas 3 yo 6(xkuwo.xa R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in ordes uak3oy0 a6xx4(w.uor 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 cirqr :0 aalx7ky mzxar+xc)95e+ cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t9ax+7zlmy5rrqx0x:+c aak)ehe 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 circgxe v-zm.n.m 0uit 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 impupc9 an )a, -uldkx:or-(x s8cedance of 60 W and a resistance of 30 W. What is oskrdc :c)xx9 l,n(-ua8up-a the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-v92 i(ilrlu gg2n0mj (W resistor, a 10-mF capacitor, and a 0.45-H indum(rj (2iln90g 2ulgivctor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capbhtws 5 / )kfu:0qbm. ;7uhkelacitor and a 15-mH coil in series?h leu50 fbq;k:sw)7 ./uhtkm b

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a ,82zwis6ipllv: 1k l m5ml.wb35d ymm 4.7-mF capacitor for a resonant frequency of 10 kv ws6mlbm5 mw dy km,.i3l8p12il:l5z Hz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor forlhvqla 6oz w9v+:1d-tzld;/j a resonant frequency o 9 lv1h;+ ao6t:lzddjl-vqwz/f 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 pzs 3mtalxpx-pu;6l:a. i 9y9w laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1009p-mxa;sl6 9ui :lz3apyt x .w0 Hz?

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