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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 f(m0q,- salreilux 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 s88t, qjues1zegjw 2 i 4ky0b/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 5w1ccs sue8j-6zp*eqloops of wire in a coil produces what kind of change on the induc8ej5qces *sw1uc-zp 6 ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wir8z9reu0/ p ,jbnvh/bpe produces what ki/p9p8j/0 b eruhzbnv ,nd of 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 x vbsew7.0f+m* (is5+8ragn yghe(raau c :y/of a loop of wire produces what kind of change on the induxa+wfrc u0sag:e 7(yar+(8.b /heinvg smy5* ced $emf$, 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 magnet-so 1w4mmlj6p ic 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 d .)1hvb.eycda conductor will be that which ten1b yhcv)edd ..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 held above ir6y xzomoq69xkz; 38y ts center zoqyk 66m3 ;oyxrx z89with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal taxujktvlxln. ,1vgtd j+/4-. cble. A bar magnet is held above its cente4+ j,v gt.n1jxuk.-v/ltl xcd r 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 table top in a re lhla.:fqdq./ zi6lu8gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abov/l i 86aq.huldfl .zq:e, 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 inkh)ktuq)t*.i;dhg 6m a region where the magnetic field vector points straight up. The magnetic fi 6qk.i;dg)mu*)h tktheld 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 magnetib, rb;wd3u v.kc field points sb v3;ur ,dbk.wtraight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasin zoaa.3n26)de+cs bnwg current )as6wbnnoe2.z+ dc3a northward. 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 the north pole entering ,d eltu k-6,g+4 f(oitzzet (nfirst. As the north pole enters the wire, the ind+4 (( egult6 f,i,ztekn -ztoduced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant anguby, n8 47,2njpzychv hlar speed about an axis whose direction can be varied. In a region where a uniform magnetic2nz,cyj yh 4n,vb78ph field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at con11raq l(ejtjm79mq(w a+v m7 vstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points st 17wa(m mvjt7e 1+q9 vl(rjaqmraight 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.i2yh/n.lyw5 jade ;m,
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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 k/u,jwmakn8a4o7//hypbh po :wjq// $emf$ 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 magnetif.chms5(4kll( dla o5c 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-west direcv d0f/71j:i.5ks u de0c*a;wrpol itdsid+9wtion) is moved northward at constant velocity through a magnetic field that point7s/d l v+dw0w5ktfu1;: 0 riej*. do9dpis cias 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 a+ 59 muuepq(p5z( mrym sm6/eit a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tr6d0vr72- dtmdw n h;e i9:vdjsansforms

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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 second,mt n .n*ccs)oqbme5p-+sdc2 gkq,4y . The frequency of the s4ob,+ dk em,s npng-c.2ycq5*t)mqc $emf$ 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 usedpptc5qu/tp6, kt 4he1 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 dhz:u 0qlac cd)4 gz7a.evice 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 s.vgl a md7:rh q;;k3mnecondary coil contains more loops than the primary coil then it 7glvh:rn kq3;dma m .;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 pri gkx s.),u x24 (4nlcb/heujgymary coil contains more loops than the secondary coil then ih4gx(jyg,un elb .4cs u)/ xk2t 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 inpzpomc o 5.qys +4w0ds:ut

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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 circuit, dggv;l )7-q (ttci1tgz* dde2

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide wy8c 3)+qkwets5k8d hal battery of constant terminal voltage. At the moment contact is made with the bye w+s) qw5ktcd8h3 k8attery, 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 conob33mar d 9t/hg :wcb,(ltc)z g dxe94nected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducto) w 3 cm4 r9h/xg 9b,tzt(abclode3dg:r 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:qw x,:aa bw7.vnowgt: 6ih 8d and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is ccmn02e1. iqhaonnected 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. Thek6*, bba8qen h time constant for the circuit represents the time required for the curra6b bn* q,h8keent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. x4okepx:t 2.iThe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to ix:xe2 to4 .kpdecrease 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 excue+ qa l;u933fszhx7p- l;ggx ept:

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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 cywxv j0d e)),yircuit, 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 connq, lqfo+(dc86i2lbb z dxh7;mth4a k ;65nu zgected to an AC power supply. In this circuit, the curren8 kiobbl zqnd2tq5;zdfhcl, 74um;(h+x 6ag6 t

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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 whate:*: dnqd;:bpdp t d+t gw;+ta factor when the frequency t +t d:gqddw :;ppbd en+;:at*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 agoli eoxm9ib*/(k6) d cross an inductor is doubled, the inductive reacig mo e9lxbi6*do)(k/ tance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across asw 7wce ye)f+4n inductor approaches zero, the inductivs4 wy)wef7ce +e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connecmh zmrs-;hxdr p25*71 ix:: cg7lbciqted to an AC power supply. In this circuit, the current srmgcbd5lx -m q*;x:hh:p2r7 c7zii1

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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 .axio y eiu*2w3n6wsstm-+5bby what factor when the frequency *5x6 a+u-oetn 2.i3iyms ww bsis 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 vol llg-*pvq/7hk tage across a capacitor approaches zero, the capacitive reactance of kl7*v qhlp/- gthat 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 q(*xoh 2j(i pjthe inductor and capacitor in a RLC ser*j2q(oj ( pixhies 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 defin- o zhw*.pq+lkvs s/wixzjh 57l25zu: ed 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 of m,i cpzv(n *hf3 3jaq+the circuit increases if R increases. Wh*h3 v,( azji +nqmfp3cen 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.09 0mlz*q),bwzb:hohbw v 0m q The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incruy 1pfn )zi9zg1s1s. sg-rry .eases 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 an7dqvjf;g3 (dh to:w:wd the capacitance both double in an LRC series circuit, the resonant frequency of(w :dtodvgw:3q j 7h;f 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 thavyyg6)3 bf: vheu7k9qgw z9h,t is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RL( p0yj(-itjt yC 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 uniform magneticzvg w)/h6jgsk*p 26 ht field of 0.20 T. Find gg6h6 hwk s 2t*)z/pvjthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiuxqbucn30*;z /;iy ttcdvcjtmq- 9 h+3 s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti m;q+d t*-9ic0bnt ct3xcuyv3 ;hqj/zc field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic t/zicsnlfigxs(*bn xl;5 / +(field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anggt/* xbf (snl s5zl +nc;i/x(ile 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 loopbz).*n0krt zm5v(sh *g(m jzb 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 chaq0pm2)v 8ld ignges 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 sqzw .rvin-t5f 4u+u5ch uare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the pl u4ft+hz win55c.- urvane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire w).)zjr z dm*hmlrd /b(8olb/nith 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 ankcog 0dls(6+19up ; gw(fopvgd 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 horizontally at a location wdp1-+; i o hv6c-qb h(yof5tk62bzfu qhere the downward component of the Earth's 5fh66qpbfk- vo1yuq zc2oih;(t+-d b 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 l jszrt g/7kc4m/9 ,vmfong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant maggm/j9 t/ smc7rv4f,kznetic 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 cross-sectional areq,.1a 9ilh/ l p0v pdmnd6rd(aa of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi6)8j h3nnimt*+eqp bmre 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 loop is 12 .vg .cdav+ wh8 hqw(m08iqr5v cm long and 8 cm qr hgdw+c8v0wmahvq(v. 5i8.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 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 arehsb vt 65-ya*ej9rx +la $0.090 \; m^{2}$ 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 + pdrs2*jr4d .shid:o construct a simple AC generator with an output of 12 V maximum when rjs srd*d:4i2 poh.d+ rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a jj h3 71vy3tytdwa+ /rgenerator 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 operates b 254grh(jis:vf * dlzon $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates ondzjb1zv06f8e.5su k o 120 V AC, and when runnjd zbue8z0kf6 sv15. oing 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 rew; 2 t;:x)fs 4+fwnqn atpew(ysistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is tp awx nys(;4twn)+e2q:fw ft ;he start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. sqj an94.yp:v The operating current is 1.0 A at full speed. What is the bacpsanvq 49.j:y k $emf$ 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 conn orm k ytkc-dy**x1(z;ected to a 24-V power supply. The operating current is c( y ;*d*rxtko1zk my-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;f 72fz xlekyz1y) 6fcpmb2+n needed to reduce 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 transform4c r7z4)rweec er causes 14 A to flow in the secondary. How many turns are in t7ce 4e4r)wcrzhe 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 248 (9kcw0g 5d0,cy mzgamm1ir f-V secondary has 100w i5mc f0 gr(k90zmyd8 cmag,1 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 coi b4g /w -lye2chjf/bdny 9bt14l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thebl4w/y9j bt4y be1f2 - gn/chd 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 primaxc3wl6*38 dy*qpoel,tk *aoa ry of a transformer. Assuming 100% efficiency, how q a d*ko3e63l oxtlpw*c8ay,*many amps 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 provides 75 mspn -iv1+o 1qp7ku:f00 V at 10.0 mA. The primary coil operates on 120 V. What dv:f 7u+s moin1k- 1ppqoes 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 sspki7 mvzp,0xm qx249econdary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secs70mq9 xmvzi ,2xp p4kondary?

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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 j(ogoc -23i,sbs hgc :on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, ib-c3 o(2 gc, :sjgshowhat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If lnml5krtrt: he 762k2/54 rq.flsseathe input current at the primary is 100 A, we can expect the ll5sk.r:5 er/tfl 4en6qt2 k7a2 shrmoutput 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 hq:oj2v gc2hht 2mh)0nas 100 turns and its secondary has 200 turns. If the input voltage to the primanhm) jct2q:voh20h g2 ry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns) 7h,bnkn(lxq and its secondary has 200 turns. If the power input to the primary is 100 W, we nqk (hb, 7xln)can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedp1m/ fetsn, p/2t f4jd up to 4500 V by a transformer and transmitted through a powdf4 tp/sp,fe1jnm2 / ter 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 604jycp 3wj:rz/ A of current 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 linj zwj43p/c:rye.

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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 0(awqf8( uwlp 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 line if the l8qwpf((awu 0voltage 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 hm3vbaa 7w2ml c3t.7 n50 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 percentabmv 3t.7ahncma7w 3l2 ge of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.hkzsy :mmc0 )1gugn21 A generator produces 100 V at 70 A. In order to re mg :mg0z21ykc1 )hsnuduce 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 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.jztc 0cg/d(p much less power would be lost if the power were transmitted at 3000 V inste.dcj(c /zgp0t ad 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:pz9.uu+u8l tb,g mfr 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 t.l : 8u,gtbzmuupr+9f he 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 coilwow+*pgdoh/ 5b6 -zb)r( tzav's mag*d /t(bw h)rzogpvab65 + o-zwnetic 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 resistor and an 18-H inductor. What is thi- d:o4wpfg8 (gxzz 6dus ciz- dxf: zpug(wdog684rcuit'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 i8qt(-0t nqn8;idcf kcn an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pfzwxnga7 -vnu95+pav 5+s w,x1i ro3seak 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 out+1zz a-p n os8d.ay(iilet. What is the resistance of the layi1 sz+zp-o(8 dani a.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 connectgzu+ .gu( tzf;ed to a 120-V ac power supply. What is the peak current through ;zzu+fg( .tugthe 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. Whkvr(m hhs+ii j3(x16z at is the power dissipated in the rzhjx+v 3i r1ms(i6(hkesistor?

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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 is x 1t2a::l o fb xe qptp,m4+1hz0vc;cr$I = 0.80 \sin (240 t)$. 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 reseot)k((cg v6 8snw ws4istor 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 resisto: dc g hwb6;a5u-d h:o)0ut w7pgnat5tr 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 inductq 4yshiin 53 b+hb(ecyyh a:.io7((t xor 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-m r0e/ 2-;ymvfi quq(gnH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive re r7mthk,st)w+fzw) 8nactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neb*aw,menzp-9wfa6(l; uz/ bjcessary 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 inductor when 120 V AC at a frequency of 20 kHz i+ okukeip*jg-km / (/*v kfvd+s applied+kf*(v+e*/iku odg/ p-mkjkv 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:pb,ug ezyr 18s/+bzu a 2.50-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 reactance of a 4.7-mF capacitor at 1h-8nq5d 2 l )zcc b:m7re7akir0 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 77wae 4oeku x)mnr, *kis needed to have 50 W of capacitive 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 10-mF;ykfl.r-k;qu 3 (gc dhnyb1u 2mj. 5hj 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 pzka9d-x3kte,t ie;xl 08;uw1 o d.pb a 0.010-mF capacitor be 100 W-,db 0up tl pkied9k.tzo ;3xew1; a8x?

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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 throuf(-3kw b k(yfigh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series civ0mf7v;j,u+ : avdi y81uqgtu5e nld(rcuit with 12.0 W resistance, 15.0 W inductive reactance, andf i,n :ae t5yvd(vu1j qud+u;lv08gm7 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 m.oz 5;ysz2r lhyax+7 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s.7my;zy z2haorlsx +5eries?

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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 :nzy51zja pscef.z/ vi;zw- :1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor i: fvz;zazenc .-wz/5: p1jsyare connected 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 connected in series with a 20-mH inductor, whuv525w bki b4: f5vnpbat is the impedance a v2 iwv5 5f5ub4:knbpbt 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 (gf8 ljmo1g2 yin series with a 20-mH inductor, what is the phase angle at 1l g8j(myfo2g 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 need2 rl,jp /wcvxjv38u)l ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 ,p j/3 j)r8uwllx2vcvW 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 followiz vwvf)1wb28 u5l yen+ng capacitances is needed in series with a 100-W resistor and 15-mH coil to getvv8bzn 2 f)u+we1 5lyw a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put i94f v,q;swu,ldv:jk qn series with a 450-mH inductor at 5000 Hz for a total impe 4k wvf:;9jv, dsq,luqdance 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 ret wzz( zo2d6o,sistor at 1.0-MHz for a total impedance of,tzwdoo2(6 zz 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What issrgm+c *l;d- h the impedance -;*sg cd+rhlm 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 nmoz2 hz a)9dni4yq) +weeded in series with a 10-mF capacitor at 1.0 kHz for a total impedaa+y 2nmio hzdq z4)w)9nce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fo bc,mixt 6y/y-r a phase an-c bitxy,/ym 6gle 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 jxet3etg2 2w f5d+* mmyv/n q(series with a 30-W resistor at 1.0 kHz for a total impedan3( xtw2n5 e*tdm+/ygje2m fvqce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wf7j*t1kemzysw x( h zr*t42:mhat is the phaxm(fz7:j1met4* 2 *htwzrys kse 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 it a(.2gi0ghgf u oovk7rk()g6w+cd.sf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a(g 7( ko02rcdh)wao6.i g tfgk guvs+.re 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 resistor, ni3mulbm6m : 2a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is con6 m :bnimm2u3lnected 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 reactance 30 W, and an indu pkji5xyowa19jx 0..qctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flox y 0w .j1kqix.ja5po9ws 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 containing a 50-W resql rit bub7w(7f n -a/r)mq vp+u0qmjh5b::b9istor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?:u-: bf w(/ itabqvqm r 9m+ b7hlrupq)57j0nb

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W re:okr/*q wfg0r hx6om;sistor for a phase angle of grhrfk6 0 *:oqmo; x/w$40^{\circ}$ 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 = 10.0vf :jp)dc c+7a mF. At what frequency should the circuit be driven in order to have maximum power transfe+) caj7c:dfpv rred 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 cirlkx*7.llfs6yi4q7zpmb c vjjb ) v4. a45x+uvcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit s4 qull5jx7f7p4 ya4+x lvv i.j).cmkv bb6*zis 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 AC3p-j4b(u,/xmp ;vex(g a8f i mgjgmt9 circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 sg xa e/wt71sk,gv9u gh33*e: v1ymfzW and a resistance of 30 W. What is the power fa,/g7 hgvsf39mewk1y*t 31ega: vszuxctor?

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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 secpvmq f r:8bik1 j -s1t3pcx31ries RLC circuit containing a 50-W resistor, a 10i3q-mjkv8:p31cr 11 pbxstf c -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 capacitor z+:(/-joo yrqtt zb 3xand a 15-mH coil in series? qozz(-3t/y :tbjo x+r

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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 4.7-mF capacitor for a ren4rdg,uqb7 uz k1+f q4sonant frequency of4k u 7zq4+,n1qgurd fb 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 )oabdb l)8ewt5/c.oeneeded in series with a 3.7-mH inductor for a resonant frequency oa/ob)5bel 8 ectw.)do 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 placed iw5dq9qr+7y9-p 3 c+btsdz)w6y kesign series with a 30-W resistor and a 40-mH coil if the resonant qcis yste7zgrw 9d pdq6ykb9+5 3+-w) frequency of the circuit is to be 1000 Hz?

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