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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 of mt5kpq3j1) sg gagnetic 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 statek *kci0z;/9(qr giapes 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 wjx0lqz hq0+ )xhat kind of change on thexjhl)x+ qq0z0 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 bk-e6ouix 0x+ magnetic field through a loop of wire produces what kind of changxbo6exk iu-+0e 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 diametew hh)g4:9o*l cwz s tkbw0axy *dz-:7gr of a loop of wire produces what kind of change on the induce ag:z 0w:* td4k)x*h-o z7slcyghbw9 wd $emf$, 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 removedaa730+;niqs kmkja 5e from a 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, the direction of an induced current in a coqakow, bhw--kw,++s z nductor will be that which tends to produce which of tsaq+b- , zk+ko-,wwwhhe 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 ia.k;rb :0i po4hzh.fj s held above its center with its north pole pointing down. The st.r4; .zijh0ba ofkh p:ationary 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 flateke r,a2iru (, on a horizontal table. A bar magnet is held above its center waker,,(ru ei2ith 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 table top in a region where the magnp7wd3.q 4fq yretic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this 3qw4 dyr f.qp7coil 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 toh,zak+6zf x -nu5zh( qp in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction 5a fkqhx-hzzz,+ 6n (uof 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 horizonta4caola1 lmt4b43.t aa ;gp8fdl table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of thea;od 14lmta ca 8l4.gpafbt 34 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 e2kq1, yj5s b3q5)gyv q5tbfpt8zh. jcarries an ever-increasing current northw fby,5)5tq8t32vqj j1h.g kesq pb5zy ard. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with they s:l epnzbl6 crur xgb)0.,+9 north pole entering first. As the north pole enters the wire, the induced current wil+ p9nrb0 gyb:ucz.)l l res6,xl be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abodxv ,2byu2g2p+r ho bp.-s/t./shvydut 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 ax2/phyhy r pvdxs ,vog.d b-22s/bu+t.is 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 imw;ndfu; +1 r1iyd yx *ft)fp3s rotated at constant angular speed about an axis whose direction can be varied. In a regionxu 1dy d +1ff3pfryi ;wnm*;t) 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. y,fkjczsz,0j*sy:g8
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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 .wdz) etsaok d.3dgg+nsw5*.that 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 magnetxfj kb,7b0rt)ic 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 (oriented in the east-v598qozx6b ajv s0qtc/y jc;1 west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrb8q 96 5 y/tcqvj0;zv1joxc saoss 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 +4bv 5+gtgk v.c7m wjnvelocity $\omega$ 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 generato r+b:pg ;kina(r transforms

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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 e4lj/o(s8 kt5.qh2 9t cx9cg9 gngrwhkach second. The frequency of the lh9xg/skwgj(5h.tg9 8kt r9qn o 24cc$emf$ 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 devic6s8sc 6th 5x4zd*fd;db0r4xq , xfxyre 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 devicyc78 7dbm/q ute 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 prip; o (kw)0umnzkpki70 mary coil then it p(0)zoikm p 0w7 ;nkkuis 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 q)3c0 x:pd3+mfqjhdjdwal1. primary coil contains more loops than the secondary coi0+3qqd1 :xfapd)wjm hd3lcj. l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the-b)*4b geo0e c ouif(u power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonanc ebk;l t9z30vt 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 .d / o,k2qrt l -fa:pr3v,bdlnare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage al v fr/dk, n3o2,qa btpd-:r.lcross 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 fb)xb (j0hh7l5i 2zjsu-ren9;gmnaj/ 0)jfh to an ideal battery of constant terminal voltage. At the moment cont 5i z/)0 nj;js jl0r-neffb )9b(uh amghjxh27act 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 i .ind z0ybs, eh25nhcva1fl -6s 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 i67 akka5q7+e+ p7jfkzloq nd;nductance 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 (2h hanj5f0*4m9ne d :jtzew care connected in series to a battery. The time constant for the circuit represents thenh ejt9*f2j0z ( 4:mecnhwda 5 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 conntfjwn/i 7p,bpdzl4k l4r0( j*ected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of j*kpbld/p0r4(4tl wz ,ijn7 fthe 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 samebtst d4xabm 8emifqzqu 9x+- :3q88v- 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. One2 1xe*vu(bss this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, t6; 69x gbvx6hz ;0v dduehmqo7he curren;xdz7gvv60md xoq;b 9h66 euht

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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 a3dt8e xn4 b(u d7w-gnqn ac circuit changes by what factor when the frequency is g d(nu-73nqewxtd 48 btripled?

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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 AC6l6s-x8xy 8zri+ eyas2v ulg3 voltage across an inductor is doubled, the inductive reactance of z 66sl- e 8y8lg+ixruvy2 x3asthat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indnmfp/v8u d lv1h/ckbg 8:5qn0uctive reactance of tnf08 ucv:hmqp nb8g/v5d l/k1hat 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 ACo9oak v .nrja/ 84lgk( power supply. In this circuit, the currenvoklr/ g 9ao48(kna.jt

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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 circuitsit+8 qo9 pan1 changes by what factor when the frequency is trias8 tpn19oi+qpled?

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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 acrcgn)j /octr 4:f j-+zfoss a capacitor approaches zero, the capacitive reg/ncf4z+of :-jtcr ) jactance 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 ewym1a2h jn7,the inductor and capacitor in a ,why 2e7na1mj RLC 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 cirw vpab1*dzp 19cuit 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 im yhj.5wt- fm+()m +vei qsnq(sfd,2xypedance of the circuit increases if R increases. When is thiss t(, fmwyq(y2)+mxehq sj+n5-v.dif 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 impv d (bz,:apghs1skz+-edance 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 circ9lcrl gfc 2- k15gbtc,uit 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 serip6( itt hzuo z*yj/-l8es circuit, the resonant frequency of that cir hluo(pz/tz6i- 8* ytjcuit 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. :yvlzy, tv4 2pAt 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 o61f-mh.07p d4m5 mnjve q leqci.(susccurs 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 magnetic field of -g5hpj s2pzlx0cdd)v a. 8m-u0.20 T. Find the magnetic flux through the loop when the pljmg8 c .u-xl-pddzp0 2s ahv5)ane 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 uniform magnetic field of i i9na-vu1a2 y1pd wy20.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are per2dy9 ayip w21aiu1 -vnpendicular.

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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 magba iu,8lq21 uu)tlqd9netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t tubldlqu1 ua,9 2q8)ihe 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 red ckn8-iw 5+duluced 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 charsur/*3am r7a q z5o.cv:6w wwnges 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 frame with s)t(9d zv;g k5aaf *ey azt6ah:ides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If tfe:z(;ag 5ytatz*a h)a69kv dhe 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 )ec xe+ -hpn))*yxy--5,z w w5pqy-ytbntn xdarea 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,efg:mq(au) 52vpa hod area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizonta p7(4 pnmzjg5qlly at a location where the downward75pjzg 4(npqm 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 constant angular vel7l cf rj5vm*qg qb ly6n4b-q ;il2idh9j4j t22ocity of 2.0 rad/s about a verti9j ;iq6jlmb-4igrh*q2yf 27t lb 2l5 cnvdjq 4cal 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 and a cros*kcwq qut *3s7,aa )z 1 qz-qfif+cx-ss-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 hukz)/z.jmhh, ; s;rc v0.+mhw w(gwbturns 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 armature. Each loos ibpghmw*tv+ (qdeaa6 jj*,-on *:d3p is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular*hnj *dw+t 63- em (pg a:,oa*bidjsvq 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 turkjpabx,brq4ia 0.5: ynl bf3*ns 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 -r jeiu7:3p3avrnv- zze7q5xcpi;u)simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A pv-3-:zq 7 uz;)e ecn 75vr3aipuxrijmagnetic 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 ge6b.gia9h7 ujg uxfs*7nerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesju:zk7mxuh-,w / 3;mrkltt 9n 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 resx9g0nlzwzba)(3uh p,istance of 6.00 W. The motor operates on 120 V AC, and when running at full spbh)l9u03(wnp gz,xaz eed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. n 9514g+myskoh tcs8 rThe operating current is 1.0 A. What is t1hm rn css84otgk95+ yhe start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected i2 z//)che,/h-vdv9 ix hyn i56mkgjrto a 24-V power supply. The operating curre kh cy 9/vgj-hrvhz)in6i2d5mi/,ex/ nt 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 f32/1 hbbsfd:9by trm W is connected to a 24-V power supply. The operating current is 1.0 A at fu d:/ry9hs2mb3ff1 tbbll 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 .p :b4thz *muwdlfc .1primary 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 1l33z uvq mt5.ylw7j3i 4 A to flow in the secondary. How many turns are in the 3l3vjywu 5iq3tzml 7 .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 z66 omw2cxo77v zt (nvare necessary in a 110-V primary if the 24-V secondov(nz zwtc6 vm7o2x67ary 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 2000-turnvjb1i-b/ js c )k7a2rn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prima21 - nasrj j)ibv/ck7bry?

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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 transformeqzn ).u+caqp- h.)axy:s; zkh 6:qsphr. Assuming 100% efficiency, how many amps at 24.c+ zs q)x:q un;.p phs)hq :6kazy-ha 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 sx8n 19uf)v.hb g6bos provides 7500 V at 10.0 mA. The primary coil operates on 8b g)u.os9sbvn61x fh 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 turns on its primary coil and 300 turns on its secx, ww-3 ,y dojretcz83ondary coil. If 120 V at 2.0 A is applied to the primary, whryw d, o83jw zxe,c3t-at voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secop.gg)f o d0-fess.0hwndary coil. If 120 V at 2.0 A is applied to thef.d .s sghfg0) wp-0oe 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 hzgij+qtx)+b 7 ja,m *sp 1:yfjas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output +i j* 1a,tq:pjfbj)syg7 zxm+ 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 turnd qxe qt4n:2;b rs,;zrs and its secondary has 200 turns. If rd2btsqe;4q;n , z:rxthe 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 tran;zn--v s gv1pqsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecti -zn;sp gv1-qvng 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 uq(1xtv y+5wt9,vu lc at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throuvq utc(l5+v,x1 wyu9 tgh a power 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 curr4 ng00q:ucj 7xho2sgo ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lin0g4 2u oh0:7cgoxjq nse.

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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 curr03 d6p)z gh3lnmwy *ukx,og ;ymji3w5 ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted*o6z)0li3kmuwyhm yndwg ,p335x ;jg 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 t xjf+ 2la6rq3jp i.1uresistance of 0.60 W. A generator produces 100 V at 70 A. In of6q.rujpa21xl t3 i+ jrder 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 lins0;i+9 zzmifwe 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 o0 smw zz+iif9;riginal 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 doe4bd9vi c-anlf l3xdd.huk .o7ufu p,mq:**.wn a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10l, *nmf..9dx fqu pahoe3-di*d7c:.u kv bu4l00 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 iu t09zp36*pt:usyqdj s 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the3pq t9ust:zpjuy0d*6 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.: ec4hy kh.g*w0 A. How much energy is stored in the coil's magnetic fiel*k:e4 yh. hcwgd?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor anz8kj85a (rfknd an 18-H inductor. What is this circuit's time constant?z(j8akn8 fk5 r

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?y 4eom:hn ww)bs/hj;) ewi+r)

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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 place4oq ;s*kc5y ajd into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of th1nrd /sv;l6 hee la s1nl6eh;vrd/ mp?

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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 pon 0 ( fdh(3n qisjvrjy;:-fr6wwer supply. What is the peak current through ( fq:(v 3-ni0 dfyjw;nrsrjh6 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 po4gmz;rnn( 2 cz/m u;azwer dissipated ia z/r ;n;nzc2m(zm4 ugn the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor :g(v t 7;dtd g:ohya1jehp5,pis $I = 0.80 \sin (240 t)$. 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 k(a3inud4m21wv,y mqis $I = 0.80 \sin (240 t)$. 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 pt,mq8 9p0zfyeta)0o z d3zr)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 mkf r- r8)( fzhprpvdo72f1w4-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.8 ktx*ikgw 0/v1jnmcp .xm1v450-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 abf;qm8k mq la47b,.b l 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 nec o 2 x2p+p4snn-q )y3db0lbrwsessary for 157 W of 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 inducdp-ph uqt:y1q id6 /)rtor when 120 V AC at a frequency of 20 kHz is appl 1iq)p6qr:-/d utdp hyied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due t m9v5 l0gnkx::6t bqn8vryqs/ o 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 reactance1 m;j5byow*fp 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 capa+8 /dr ynag(md1 oo/urjv0-q bjmt42fcitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 4wxy1-r:r5sepf.e mz ho n5* b10-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 0.01 65bf /udfb)yb0-mF capacitor be 100 W?fufb6)/yd5 bb

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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 capacitsf3ofun i h*4/h3t)* k mcm+wcor 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 6bwktip)ik3. .0 W resistance, 15.0 W inductive reaikt.bi)k p w36ctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, .8t a8ccl19wnnkg z: e20-mH coil, and 1.0-mF capacitor are cont:kz1 nc9 g8ecl8.wannected 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 1.0-mF 7w*hxuy5lp.l -ndva 9 capacitor are connected in seril57 xd*np 9u aylv.wh-es?

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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 resistorfa7kvu)u79l d1 zb4** aaaui zux97nr is connected in series with a 20-mH inductor, what is the i9)1ilfka779*r4a uuz*aa7 udxunb z vmpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serie *,xx7by+ zwdps with a 20-mH inductor, what is the phase a,p d7xwzy*x+ bngle 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 circuitpn mp)uzhimqj((rmo un:/ (c;4 2ee/u with a 20-mH coil and 1.0-mF capacitor for a total impe m zhuiqe2p)/up((u eon c(/rmn:4 mj;dance 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 capac vqe( i4rox6+ : uxp-)t(kqizmitances is needed in series with a 100-W resistor and 15-mH coil to get a totak zq6+(x:ix(q)m4pre it-uo vl impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz forq aq0gh 2bg1w9q-,iib a total 0qgq9gbi- b21aiqwh, impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.uh7hvx by ce64zt4q 9d5v,px9:* t6r i2qcbuq0-MHz for a total impedance of 150 u 9u6,herdzy9c:p6x 7qvxhiq t45bq4bt* c 2 vkW?

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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 capaciul(a4v7b7gmfx ao0/ 7xd6kuj)kyt e/.y+re ltor. What is the impedance at 1000 Hz m7/xb +f0kt7l(vd /kea7xygj )l.yeouu 64ra ?

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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 capacitohw8v2z9 0 tm 5yle3r+ 0nxsrqwr at 1.0 kHz for a total impedance of0qmsrl0+9y5 8 23nwhtvez rxw 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a pha:zo-sbxukb5; 3 xd4nb8kibm3 se anmb-z5xb;ns4o:8 3kkib3x d u bgle 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 x.v..f 6gv*+ ur dz3fnn7 qwmn,m:pbpa total impedance of 45umz..n+. f 7,6:r gv vwfxm3qd*npnbp W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is 9tl3 e;uejy przy6en 4x8z+m4the phase angle? ezel98uy;3z+6e4 n mx4 jtpyr

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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 150bolo:se 4t3/ 5b/k hnb0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cs bt4 /lbo bn53oe/k:honnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF +g fcp27bi kc tj7;-ri x/w 6w24hdkrdcapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the7 igw4-i+kfr 7cp2jt 2 drdbh/c6kx w; 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 capahlrga 1ku5u52citor of capacitive reactance 30 W, and an inductor of inductive reactance 25 hrlk1a5uu g30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC civih;0q7b pxq4n2r b( lrcuit containing a 50-W resistor, a 10-mn ( 2q0rvqh7pilx4bb;F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series*.o w)guxsxawj x4 5f.3)p*j ruu.mue with a 500-W resistor for a phase angle osfu*5op j uxma34rg.uw)x*wu x).e.jf $40^{\circ}$ 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, L = 200-mH, C = 10.0 m1;d; f luukx(+ -fggxrbk,p :mF. At what frequency should the circuit be drivenfd,m 1(;pbxg +uf:;-rxu gkkl in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output inxx f.ngjv2g-lje30 /x an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powg/2.ejj gxnl0x- 3vfxer 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 circp botbj56 on+aa+t 9x/uit 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 k664foznjq d-q,snzbvz 1( b2 a resistance of 30 W. What is the power f,fo qjnbqz(sz z v6n1bdk2 4-6actor?

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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 5+ kiy o2ks)iz/kz +s7 8 /iyn8;vcngtukfb6, d0-W resistor, a 10+idyvb+s;c8 sng fkn)k6 o t uiyz/2k,i7zk/8-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitw*i2zg .j2rjr ;dj6stor and a 15-mH coil in series? j. jr*gi6d;j2rts zw2

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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 serieojqj2 szt0f g )smz1or6x,52i s with a 4.7-mF capacitor for a resonant frequen0ifos6xzqt5jr2 gms, 2j ) 1zocy 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 series with a 3.7-mH inductor for a)guq3o. 9k:cq va*od-mpkc3 y resonant frequency of 1000 :3kvo3 *c .opkacy)qmgd9-uqHz?

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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 4yglkp4 k te(g9/ 1mt11sxiy2kmtkx0+ys (+ks 0-mH coil if the resonant frequency ktyt1i(4 tmlk 1 kg1s+mgy+sx xkk(yp0e92/ sof the circuit is to be 1000 Hz?

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