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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units ofrv;p 6bx 99qx bo/).:mgq crcm magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that f6 5dyvr(2m8n mw,qvdjw7hl)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 pezchbl, -q:;m9rvk )wroduces what kind of change on the induw9 rhz,vm q;b: -klc)eced $emf$, 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 malot. u92*oinnv+sgg :gnetic field through a loop of wire produces what kind oun29i. gt v:soo+ln g*f change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change o( uzh )+zpn)n2dp,gten the induced z( z,n2pt+)gn )u pedh$emf$, 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 fieldvmleg,)(f ciq,yt/p51 2 hhcz 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 induced current in a conduc+wzcwmxl20rn. w6;k x tor will be that which tenx 0+6 lxk2wrz;nmcww.ds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is s*7pr3zsc;w e 1q 1ropheld above its center with its north pole pointing down. The stationary magnet induces;zo er1 qr7*csw3 spp1 (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 ta, -s0sg5giwbw ble. A bar magnet is held above its center i0wbggs,5sw - with its north pole pointing 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 x;;iyed fnp; )table top in a region where the magnetic field vector poin;)def iny;x ;pts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a lebjb 39v:dul5a vel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When vilav9db: j bu35ewed 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 fielt,a5c;q c05iww 29g boq;t7doy 4qyy kd points straight down. The magnetic field disappears suddenly. When viewed from above, what0;o a42w5 b k,qwy qiyctd;g7 qtc5yo9 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 eve t pyo ;8,(*j2jtmw df/lzz/mpr-increasing current northward. Two coils of wire lie flat on the2w mz(l;dj*typj/ z,m/ of pt8 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 t gu0ej46jvh w:v-) 5nt v/ybmvhe north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from ab-4ve b )v g:wv0hvnmj6/ 5jyutove)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular*jn+in8 ) yuyr speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowrujy*8n i)+ynn, 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/*hw,bg oo /6 ge3 3odvbwjm: n2ytsz( at constant angular speed about an axis whose direction can be varied. In , (6we/mbj 3b:/gz ynhsg3tovw* ood2a 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.cbn 3xxwwc1py mu *-/4
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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 thae 43gwtfsu((bt an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The v8n blnhfft73ex47:u $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is movedm, xgxw qan4hw)2ez96 northward at constant velocity through a magnetic field that panq,z9x)ge hw x64m2w oints 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 at2 ez5smfm7a- 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 tran15 kuxpvep ;g b;(0bnxsforms

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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 revmv/wv*y : tjn1olutions each second. The frequency of the j /tvy1*mnw:v$emf$ 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 usr6f y7r6*jh bpiy 1 ojk3/d1yled 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 de7cmwv 6-(drgw vice 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 la. )kbjbv)q8than the primary coil then ita)b.8b ) klvqj is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sov ; l.w/n9+pmout(s hecondary coil then it is atl9po;. +/msohn( wuv

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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 pmx,ao t.fco pdpe;+, -ower 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 circuizy zc.l/.6r16 ittgd ht,

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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 seriesisbe3zgp8q3k 4rkx46 g9,qlf to an ideal battery of constant terminal voltage. At the moment contact is made with q4 3i f8kz4s6rggkb 9xp3lq,ethe battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in slojuw,i;777nad e av/eries to an ideal battery of constant terminal voltage. At the, n; eo7j7uaw7ivadl/ 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 wi8ts cu0o1hz(ds5u qvg9pn 74sth inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L .,v/yw vr6v v),9im ssmgdr4b 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. T.z 0az i-e,-m y2puswlhe time constant for the circuit represents thwli.e,s- 0up azy2z-m e time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a baf 24m4:5 y54beswc;e 2dni rbhiau1f.3rhchz ttery. The battery is suddeha 1s3m2wif44cd4b 5n : 5;yhhc ru.zber2ifenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exceppnpbq.. xxe-(zv piv43x/d . et:

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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 e,b -zmngd6f 0 *o0kxmcircuit, 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 thise -8akto 3bu/l circuit, the currentkt8 -blau/e 3o

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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 u tc1j/ndgqm3;l 6v(vvtr,; 1 dahe/sthe frequency is tripletu,c(//v ;r1a1tsj ngmve3dhq d l v;6d?

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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 acr-ahgwij9 ik;6p-gz ,hoss an inductor is doubled, the inductive reactance of that6,phg9hjiz- wkgia;- 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 inductor0bhus5qi y8k5 approaches zero, the inductive reactance of thatbk0h8sy 55q ui 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 co8vykajo237qlmf9+9a t :qihonnected to an AC power supply. In this circuit, the curreo3vyk:ho9aa jq i 7mftq +2l89nt

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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 aie8d mzk d(xc)z6uq9ap 96iv7n ac circuit changes by what factor when the frequency is a p 68v k7qzi9e9mx6z) (iucddtripled?

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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 cag(ns0.koy;4fs4t8hm d6 u xfd pacitor approaches zero, the capacitive reactance of that n80o4(ms x f fddt.6sghuk4y; 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 indu(ybq 9; cgip txrf9h+5ud.sb3ctor and capacitor in a RLb9 cu(i +5qx rp h;.f9byg3dtsC series 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 circuit is defined .pua -kfnubn j2g,unq4kh:1 b;qa88 xas $\cos M = R/Z$, 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 im-4ts8fq ao*kv pedance of the circuit increases if R increases. W4*sk-vfta o8 qhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The imd8dy u9r/h;oy a*y/wh pedance 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 impeda7 f 9a+ej7t5hah q-y wvjhfgyas * b:f.5z7bc,nce of the 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 an LRC series czi qvz+1b 3hn bjyjgar7m)(-0ircuit, the resonant frequency of that circuit w)+jjnq zgh3 amb7y1-zv0 bi(rill

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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. y mfg; 7of- ;8kfkui4tAt 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 circuit occurs 7)oq m9 f8bnh8qxvgcnth+pk.ra*0 (ewhen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fvlke3l :s9s8ri hpo9x m l,-1w(rhjk,ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallhvm i,,1swr8: k pxjl9 -slolhe3(9kr el.

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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 *d0x6d)s dos1(a lnqy xs0.hzm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic sd10n )q*xo 6x dldy.sh0az (sfield 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 7vrz2 ;/xp e*qdecv4tc v+k;b0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldr p7v;2v*;v q/cedcb+4etzxk 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 singb-djb;(e.hqydc1 8llfk9q .mm:cfd. le 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 p-.7nr mg/b3fvbdr ls,9nv,sfrom $4.0 \times 10^{-5} \; Wb$ 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 turnehkahvww-)er:*f3w s r,85aps+r4h84kot vp s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducesv,hewvew fr t+3ra845kp 8w-rh:askh4)op *d $emf$.

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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, eb9qj8 lg/xw*yyg w8 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 areyf-c f58w at0fa $0.20 \; m^{2}$ 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 win hc/ (mi3n -lcwtie/uz,e f(c0: jiy2cg span of 60 m flies horizontally at a location where the downwardjwn2cc(z0/e/ -:3lemtyhu c, (fc i ii component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a conswb5 6sxklu 9d7a0v. jltant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a consta k7 5ub0va9.ld6wlxjsnt 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 anfwbn9 ;n7isfiz)jgc .,x4dz6d 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 turnse ;cgug :uv;f3at kg4j61iam2 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 loops on its arma zhflzy20g/1hf)t0 p;nder*l ture. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the lopr2f;tzd y1hnh*fle0)l/0z g op 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 turn4nezt9y9 1m aws 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator4l7 p1ntd lg)c,x2mwh with an output of 12 V maximum when rotatctw1h dxnmp27)4,lgled 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 withdm.gs;bv9b+2 b.w rb 8rp+n vu 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 have a resistancek woc- ro311ln 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 moh8f)aw l v6zl8tor have a resistance of 6.00 W. The motor operates on 120 V AC, and whw6lfhalzv8) 8 en 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 6.0oj,v.82s zea ivj*:kepz*x b5 W is connected to a 24-V power supply. The operating current is 1.0 A. Whaz2jzp 5 ve *:,iovj*.kxes8bat 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 resistanc:pw biym8 *rd;e 6.0 W is connected to a 24-V power supply. The operati8irmdyb p;: w*ng 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 24-V powd;oc51hussc 485 *zb f rbxnoks;2fy4 er supply. The operk4 2y8; foc bb*nsssohd5;xrc1fu45 zating current 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 reducefw c+,twhqq16t vxcr+qv:) 5p8ntn5y a primary 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. je5f sits)n 2ucw1x2 A to flow in the secondary. Hotcu.2)nwjses 5if 1 2xw 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 s 1xfu6p h*um6if the 24-V secondarymphux 1s6f*u6 has 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 and a,ibw3 8oeo f+j 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cufoj oew,i8 +b3rrent 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 pre qr1sz *e)f)yimary of a transformer. Assuming 100% efficiency, how many ampsqye*1s))fer z at 24 V can flow 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 3ilew4,6uqws provides 7500 V at 10.0 mA. The primary coil oper ul,i643q wsewates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnxsjtim: 2tsx(( g)e/es 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 sect(j (eixst )x:mg/2esondary?

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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 coif rr2ux /vh5 p91thow e6e-f6vl and 300 turns on its secondary x6-ftf1vue6 9o/vrrph2 5ewhcoil. 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 secondarb2e16 pi cv;wry has 200 turns. If the input current at the primar61; v2cwe prbiy is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns andobnd icqm);m;i;; d fjt--v5s 1a1tyg its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sv1qc5o; n-; bfigs- t )mmid;d1t;jayecondary 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 secondgsa,rw(ha i9o+w 7mb;+ weh (uary has 200 turns. If the power input to the primary isum+ewb9 oh(7wh+a s(iw g,;r a 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cck )n -oirij:/urrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow:ii jc)rn-ok/ er line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currsc(df.s8 s (,dvm v r(4ybcea3ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throug.crd3 ,4cvb(s(dsy fse( mv8ah 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. The voltage is uorir8uv+qnw ni93i4 / rj fl6:sually stepped up to 4500 V b qo fvl6nr3n+/j4 wiriri8 :9uy a transformer and 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 line6x2w:byo nobk, f2qv2 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 voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the originakq, x bnyofw22vo 6b2:l 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 lix. yv84 3 m/r1j7nrwrnhw2hzxne 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 transmissrwr ywhv 4j3.x/2zxnrhm781n ion 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-W lin31kfl)zy ss 0 ufod.4re at 1000 V. How much less power would be lost if the fdr z 4os0s1).kfyu3lpower 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 at y i*k ;6 a p)*y8aeocmdv0:/pfzzke x(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 transformer if the power loss in transmissionze ypk:dixzpo8 *(c/ yf6*a kvem0 );a 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 mk. ,3hcth5cf eya ij, )h./csmuch energy is stored in the coil's magnetic fiele/hfy5,jimkc st, h.)3ac h .cd?

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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/ + -op oa)zb7tpxz rzx:jr+d+-W resistor and an 18-H inductor. What is this c7orz+zxzd p +-x rj:tpba/)+ oircuit'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 wh3wnki-c62pdk7/1cyve0s u: ljti pt( ere 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 oimt0 824fgnegxk 1d4u utlet. 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 resistam c/tr: tn0ta2+kue o)nce of the lamp+t 0mare/ :)cn ok2ttu?

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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 s/ 3m zm yu6f g4+*z9taycj4za3-hfd roupply. What is the peak current tda j /omyrzfmu*t934fhzz 6 y-3a+gc4hrough 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 power8 l7fybnq ta)/ dissipated in thf8tyl/7b) nq ae 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 resi dzyveg .7 o:b.tlq5)kstor 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-uj7v/lk s10srp o/ k*pW 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+i*u9npxp2h yistor 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 ine4p0 a8lw4xkq ductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100sh , -7m :l bb0*jwagaugci(e(0 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 xh;n wdv. 0ejgsr/e*9-az6 jhinductive 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 reactance at 1000 t 9 b6gqdd7p4bHz?

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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 freqbm43kosas2+p3 lx/ geuency of 20 kHz is applied to i 2kp3/seom xg+ sba3l4t?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 6h*+ xln-iy q/b0.0 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 cqmy9-p4o 3 9uwbjy4iv apacitor 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 reactanroo8(fm 3wn e))we oc7 cb71whce 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 doe62c 6mcqo)jpo7up p3ps a 10-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 capacitor be 10 9h fcmum.78qb1dilc3 0 W?h.c7mbi91q8fduc 3m l

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.ze-v mt wce0;pd+ axl*;hd4 w90 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 j4jyo wn1h,+aac series circuit with 12.0 W resistance, 15.0 W inductivjnhw4,a+oj1 ye 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 a j( qxjjk zvc2e/+nmk6 )o-6w,ebnrh4t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connece2qkzj4-6(mh6vnxr jn/k)+ eb,j ocw ted 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 io er*zruse3m0)b+2z coil, and 1.0-mF capacitor are cozue0 3 )*eizr2mrs+b onnected 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 connecwg+v6+htn(z r ted in series with a 20-mH inductor, what is the impedanwz(rght++v6 nce 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 colk:i/ xq7- djd xr+s0.tcg .7cm bxvv6nnected in series with a 20-mH inductor, what is the phivv c7.60dlxb j d /ksm+q:rtx7-g.xcase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF cadq,3enu*c tr4 pacitor forru4c 3q, dtne* 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*u0sl;7ni pykc7 ar0u is needed in series with a 100-W resistor and 15-mH coil to get a totaypc0;n*ar0i7u l7 ksul 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 5 o-w-*za qnbeput in series with a 450-mH inductor at 5000 Hz for a total impedance n w-aob5e *q-zof 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 195 h;1fgn xmcn2nb ye(00-kW resistor at 1.0-MHz for a total impedance of2bf9n(e1 5ynmxg;ch n 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. Whl mosp)x * r24w2wujc6at is the impedan)2w pmxcrol*264wu s jce 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 capacitokcr6td tt/bm, se */ot;h: kb b:6gj6hr at 1.0 kHz for a total impedance of 45 Wbkeht/ t6btr6hk 6:, ;gs*t :dmj bco/?

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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 n 0.v .;vudy-odci*fx8;paca10-mF capacitor at 1.0 kHz for a phasy08.vad in xf;coduvpc.*;- ae 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 hioj :;wu a*t7a;,guzfor a total iu7;*twahz:a, goi ju; mpedance 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 ;gdbmd6 .r x*;pug :p/xml,tqseries with a 100-mF capacitor at 120 Hz. What is the phaxlmggb; ;:prx6/pmddu, tq* .se 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-ugt1rn(3bcmw 11 gz h87rx-oyW resistor, 20-mH coil, and 1.0-mF capacic1 uxnr8hg b3wzy- 11 7gmor(ttor 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 r-jdcmeng7 +j g5ftn-z.u6m n 5pq3gl.esistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuld -c. .g3ft5p zn5q+g-um7n emgj6njit 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 capacitive xbl q2br gmls3p5;ko/.,y+ 5f;/6plnjwgk l sreactance 30 W, and an inductor of inductive reactance 30 W are connected in series5y5lksg /6pjbbl;snof+qkl ;/l3.,2px g wrm to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for21 evsn45)w cjib6 evpm0x8fx a series RLC circuit containing a 50-W resistor, a 10-mF c me8wnbp)se261 j0xv54 vixcfapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series(we, o eeas7ffsu3c**a ,tls.h ,(mcx with a 500-W resistor for a phase angle of (f3 us a,cxfem s,, acetoh 7.*(s*elw$40^{\circ}$ 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, Lj k;ubw9om : yqn04;bp = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxi w:;b pyqm4kju;ob09nmum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resis2c fic.zvgcj)+ux8 n/0u d 3hftance, 15.0 W inductive reactance, andcnfzx283difg+ju0h u). c/cv 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit z0i8i xv:6ovpr1 g3md 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. Wha;aok- gh; 6v7:sp 5qe)q pjdtkt is the power fack- :oe 7q gt6)j5qdhv;spkpa;tor?

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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 containingc8 iqa n:wl:8g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz lgan:8c 8qi:wpower 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 freq0jw0o( t y /8m+wf+r) 8deli2 xdw7fxm n1nyvnuency of a 1.0-mF capacitor and a 15-mH coil in series?w8fe mn/y wrn1) fv0+20(+8wdxildt7 jnx ymo

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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 0cco7+pi8 (tow dv2hza 4.7-mF capacitor for a resonant frequencyd+ c2to0wcpv(i 78hoz of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in sb( *3bbdhe tc7eries with a 3.7-mH inductor for a resonant frequency of cbb tbde73h* (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 with a 30-W resistor and a 40-mH co6 /m x2 j5a/cdiod3wwmil if the resonant frequency of the circuit is xdaim2/jmw/3d 5o6w cto be 1000 Hz?

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