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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 uni6l+ zis;t:a6r7 wfj0bq3 ksakts of 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 inductionqxmu)zc7i 6 n3 states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wdk3iu9 d4dhy.nkzq, ;ire in a coil produces what kind of change on the ind,;n 9h zd. dkqkiy3u4duced $emf$, 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 wire6ps 8a2il8tu nm6rw i3 produces what kind of change on the indu36 upmt8 na28sril w6iced $emf$, 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 chll*qfa4k f2*an 1a/wwange on the inducedflaqf*w2la41/ *k wna $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an s,wi,f,zatp0m6 uf 5jhjw 135;.rju qzo7til $emf$ 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 cex0kxd: iz28udj(mi 97q1i pbf +o:d direction of an induced current in a conductor will be that which tends to produce which of the (d ox iqd8:71b: ifkceu mxp9+z0i2jd 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 fhp 1p x 2s8g+lfyfgo:-lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The statiofpp+ y2:1g-s hlg oxf8nary 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 os wl.- (v6uozdl5ctt4af9o*y n a horizontal table. A bar magnet is held above its center with its north pole w 6oc5ultf9 s(o4ty da.l*z- vpointing 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 magnetic field vector poin t,3ib ;:d4xg,xlsr8,qon w/wu7z6w8 nengw kts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thise:g4xotwbsnw,3;rwk,6 qnzu8 7 wx/l8n gid, coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a r+q;n;k3o 3. b(k oovkuh,xg qnegion where the magnetic field vector points straight up. The maokuqq33 k n,o;k(ongb+ hvx.; gnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the ma3 quzmw; tj23r si0hg,gnetic field points straight down. The magnetic r3i3uw,;z tmsjq20 hgfield 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 horizozggh,h1;zjp . ntal table and carries an ever-increasing current northward. Two coils of wir z;hpz,j g1.ghe 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 a8 ypt jh5nc27pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above7 hnj 2cy8t5pa)

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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 wiwtqf e:s(q,)s re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axistq,fqs(:s w)e of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angullc d+uvzx+.0;,qow+ rdk egr(ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight ddz ol++vkr;wd+.x ,cger 0q( uown, 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.nck k3c 0,9gux
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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 t)5l k yam(;-pakm5ocsgzg71 vhat 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 magnecfyg 5ye :r9a5tic 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-).ng3xey4h 1 anl (dqawest direction) is moved northward at constant velocity through a magnetic field that points straightlaa y).q3nh xn(d 1eg4 down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vm75zx9 el k o-u);r9u kbqoh7w:myg 2felocity $\omega$ 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 generatod0 ctwkv5gb nswr3; 3p 1p5j7wr 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 revolue n-a4h/oe5e 0oe 9bdltions each second. The frequency of the e 0-h e4enlboao9 e/d5$emf$ 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 de/vo20b y iop*mvice 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 devicd1h7qe/ l6x5 y f: --bxl5j oku*zkkfee 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 primary coi 99:vwsjiy9eq wh: 4vnl thsq 4n:v vw9ijhy9w9e:en it 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 cbeu -w*0x-/7puxk 14ip(;tuuz xrdb z ontains more loops than the secondary coil then it isrp-uuw;pib-k x(z 7z4b xud t*10eu/x 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, th1n 5.ml2 7n:gm2x d ittajod2se 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 resonant circui3hfaty usd z v5))tmg e;+4se;t,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal x/x:,1ns nysl battery of constant terminal voltage. At the moment contact sy,1s:xx nl /nis made with the 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 series to an ideal bapjm;6 lseag z53f1 3wattery of constant terminal voltage. At the mome zga3p m5jle6fas1w3;nt contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with indb-vo 02vwwh k0axqw*fgpp:s -j/8 i7buctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an zobw4twop7 92 e*+5 eceh2qeb- p0cqd$emf$. 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 induc0 ,dics +;f21mrkp jyutor are connected in series to a battery. The time constant fori, y1p;2 dfcsm ukr0j+ the circuit represents the 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 battery. bjjm,/b bnj57 The battery is suddenly removed from the circuit. The time constant for of the b j /jmbb7,5jncircuit 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 sameg stc6:+tt,1ox y z k7wpj/lz4 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. On this bs* mht3vy0, pcircuit, 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 connefu-.e 04 fdt:9smpdsycted to an AC power supply. In this circuit, the current.sy 4 0:mfu d9dft-sep

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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 circuiuj-ry u364qd bt changes by what factor when the frequency is t3j qdy4ruu6 b-ripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inds/f lloi 8gs1yt0;jh5 2htjp .uctor is doubled, the inductive reactance of that it0gfyl s los1j5hhp8/;t.ji 2nductor

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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 thevuq5m) ggrsm -n132u be;jz3k AC voltage across an inductor approaches zero, the inductive reactance of thatg5mr j 3-bgkmz)n es3 qvu2u;1 coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this ygdmxf k*p 04lw7c31d circuit, the current d4df3y 7*g0 cm1wlkxp

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the freqja+2 x0 eyutf(uency is tr0(ax2 +yf etjuipled?

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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 voltagk -lbl6 ran/s5e across a capacitor approaches zero, the capacitive reactance of that capacit5 ln-/arbk6ls or

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and c:j(t :sphz3r xe9.n)wh8 o uooj,unf,apacitor in a RLC series cireuno o x89(wp :jh.n,h,3ft o )uzs:jrcuit?

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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 ciy;rw;*nbqj i:xq1 c9*h.pjjfy5 su 9ircuit 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. Thq-hqu) r m/cr8q8 g4ype impedance of the circuit increases if R increases. When is th8-y )mqug c/84 pqrqhris 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 impedance of the cir yp-o6v czfgw,zs*mhwae-v.v *t /b(+cuit 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 circuit1gawhnu d (p0z d 7u8syvc,1)k. The impedance 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 ands9 v ckod;co6)a0fne+tj7h,w the capacitance both double in an LRC series circuit, the resonant frequency of that)te0 sc;jv6 a7 okow+d cfn9h, 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 circurk.( t-/17dih n ujkcsjc3m-git that 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 R x 5ohx2arcu g0i5:ec2LC 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 k :uy(*+ ea-lxuzjj3b 6 bxp9wmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopxuy 6(pwbj 3:*u xk a9+lzj-eb 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 untefd+lq 48*esi .rz,viform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag4vs+fe.t*q z l,erid8netic 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 v*v4e ,onghho/sxvafe601 x7 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 field vectn g 1 4evfh/xo vo0*vxse76,ahor 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;(u zr gbl2du.uced 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 froqbcp 2) yiv+8bm $4.0 \times 10^{-5} \; Wb$ 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 evg mvdj;o* 9 0u32dlqsides 18 cm. A uniform magnetic field is applied perpendiculvmujg; d09q3 2 vedlo*ar to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns afd;(pmau:o3 2 4on,8r gj o jctqd)-rynd 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 arehv98e hanrelh3(1qyp ,7 vsy1a $0.20 \; m^{2}$ 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 608 iy4d x 0yfg0,xvm8p2j+jzz7 p ed8pn m flies horizontally at a location where the downward component of thezpe ngdpd7y jx8vx 2pzj0+88f 0, 4iym 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 longgzc) n +q:9bhlsgc;n.z eg+ 9v rotates at a constant angular velocity of 2.0 rcgnl sh;.engzv:9)+ qzgc+ 9bad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generato3 xk5p/5rv2 g**vscazai tf,er has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ari *i/fa 695ff jhjg/pqea $0.090 \; m^{2}$ 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 i(fmer:-)b 8xv.j btvq )unub(s 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axifer bmb b)qu(v8- tunxjv.) (:s 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 k9z8 aq2 oggfc018psxwire 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 Av.v;op8l qe. 8 4vgdtjC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is jldgv qo.. pe8vv4 t;8$100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a m *xvfk4so2mtw7r6*q i aximum $emf$ 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 ontc4cnz rudm 3/.)zc7l $120 \; V$ 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 hafoo(3v70kj2 stj8 zxdve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates ak tzo(2dvjsfo7j 80x 3 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 sup+gr k lkfets1, el7.p*ply. The operating current is 1.0 A. What is the start-up curren1p.eg fkl, kr+s7*tlet?

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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 resistanm4uz.-8t8hd v0 jz nloce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speedjtml8zo nv.0 8z4h-u d. 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 resp1 i qy7zufx8 i9)q4ewistance 6.0 W is connected to a 24-V power supply. The operatingip4 yqx7iz9w 8q1fu )e 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 to1fvey3)02k 6p0yq dvb cxj0e*r 6qsis 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 transformer causes 14 A to flow 2r-qy kzito1*w f:;lk-hyip9in the secondary. How many turns ho-q9zwyrt1kk: ;fii 2-p l y*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 pigf8e0. q4l 7e gcca0frimary if the 24-V secondary has 100 g .ie7f 8cca40 eql0fgturns?

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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-t1h 0ni6:azo3j s xe6qlurn secondary coil. If the current in the secondary is 3.0 A, what is the curzx0aon31s 6i q: l6jehrent 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 iung:9hn3okhfz 9mr9 7 n the primary of a transformer. Assuming 100% efficiency, how many amps at k9gnmh39hnf9:7 o uzr24 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 7500 V at 10.0 mA. n-sk ,5b6m9n,g kpjpb The primary coil operates on 120 V. Whagj p msn,k9 k56-nbp,bt 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 turg82f 85fhkqnfm8ct s +9 ;svirns on its primary coil and 300 turns on its secondary coil. I89fcvq +sg8iftn h 2sr ;5km8ff 120 V at 2.0 A is applied to the primary, what 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 1tsbfw 5 z(b+mon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in t zm+f1w5bb(tshe 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 jwwe:th u0t3e54 +d ,x2frozwturns and its secondary has 200 turns. If the input current at the primary is 100 A, wt+x d5h0 e fr:t3z4wjeo 2wuw,e 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 luzkc +1r+tp3g elq4b r40 3caturns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltktur qll4a4r++03cce3 bg p1zage 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 i;x1 m(0 gleyq100 turns and its secondary has 200 turns. If the poweq;yx01ei lg(mr input to the primary is 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 current at 120 V. The voltage is usupxj5x zo uvqq(6bly8b w,h8u6nl,m( 0ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primarmx qul u86jx6 h0np ,b,ol(5vw8zq( yby 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 producesg 7 y*ic5t8yyk:,ba-5ruyc yz f +:qle 60 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 perckrcztyi :y-yu8eqa 5+ * 7yc:ly,b g5fentage 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. iq j5ms9z *pm)/m --mx7yl8tvj /fcexThe voltage is usually stepped up to 4500 V by a transformer and trajm)/ iftcx m95xyjsz-le -mq/7m *v8p nsmitted 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 resistance of 0.60 W. Ao3tq ylplhvi //*9c* f 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 olh*yitfc*q3/ o vl/p9f 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 kmr4-ki img s;w* 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 heaiisk g*r4w-m; ting 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 much leu f2+q)y mqsk5ss power would be lost if the power were transmittedy+q)k qm u52sf 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 20 A. It is to be transmitted on a zl:7hc7qo cm 8line with resistance of 0.60 W. To whatm 7lo:8 c7qchz voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of+8 ) xqy.8 dp .idvf0s7wggz uiw;xd3y 5.0 A. How much energy is stored in the coil's syipx8 .vd yd8g0idg.3) wu +wxq;7fzmagnetic 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 an50/yp7rwipn:em07o0 j gx xv d 18-H inductor. What is this circuit's x5pjry0og/x 00i np:d7wm 7evtime 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 where the rms voltage is 120jkc85mz9 mn0wqhe nkd66i -im1r/s c , 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 outlft 5e2g n aim7c4a)y3jet. 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. ;myb t4jfb5 vgg3v1sy5n i pe-) b+ee0 What is the resistance of the lampm450 ebj p+t1g vn)sy;be-vyib3gef5?

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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 supply. What is the peak cu.tcn gm w8qqom8syv;m((br 4:2syjwx-kf5 b 0rrent through the resistor?b x w 5kmmv2((jw-8 m fb8s40sctr:n;ygy.qoq

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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-V63 3rzgo+3sapv0 /lo di3e w,as1r tqo ac power supply. What is the power dissipated in the resistor?/rieqgrz,3 toos+aas d v36p1 0lw3o 3

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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 io pa zf.9zw478b l gxyfdtu2 kv0b.(;ms $I = 0.80 \sin (240 t)$. 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 resistop*.m gwyr41hwr 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 resistor ihza ** 9,myf)2ckbe dc:,yhrss $I = 0.80 \sin (240 t)$. 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 inductorc/y(k8va1udv 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 zdlrcgmmzljxb2u . h, l6hm5x(b:4:pc o-0/oa 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inducti-qvz(/k r0( ,zttt-o uqdc 2utve 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 inducy zfen.o5* n5jtive 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 A*a c:wmil ,; srqx1d+x: i(f9wyat:rqC at a frequency of 20 kHz is ap xir f:cwmqa( sa:w1xl9*r:q,tyi+d; plied 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 to a 110-V, 60.0 Hz so ( khw63h3hfom zpyj4l0:pi 8durce?

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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 rel0z.( (xr njwiactance 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+ cds l/+:te)pn*5m4ne c4wqgh3t znh 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 capacitor have a reactaxwh5x06 q tsy5nce 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 reas6 93 jm9 x1eyck3g2nqi) uuinctance of a 0.010-mF capacitor be 100 Wx ug9icy12nu qjn)s m33ike 96?

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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-mF0 hakpky az-6 ms.xr8 xafw237 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 obqr;p0u tcf tbr/ge13c 2s0 6circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci0tec06r urfco/qgsb23 1ptb;tive 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 ajjmzx+6/ 5lim t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF j5/l+6 jxzmmi capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz gy/) yxbhpc, 94pv r1aif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s/capy hy vp,r1g)4 9xberies?

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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 conn 2frl,z-b9+iflu1x s dected in series with a 20-mH inductor, what is the impedl l2u ,s1dbx-r9zfi +fance 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 series with a 20-mH ind - yln1a;rsau)uctor, what is the phase angle aa sl ;rnua)y1-t 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 ib, rvu-jt+g7 vn a series circuit with a 20-mH coil and 1.0-mF capacitor for a totav tugb,v+r7-jl 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 is navk *1an)f kjzn) .dw4eeded in series with a 100-W resistor and 15-mH coil to get a total impedav nz4) wja.k*ad1nk)fnce 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 500.psn wk8iy,. c s-hs;a0 Hz for a total impedance of 40000 W iws n,;sh.a8p-s .cyk?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must qfa(t0;2- om zqdp ;abbe put in series with a 100-kW resistor at 1.0-MHz for a total impedance d 2 zq-q(;;m0afapt boof 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 c7n+,4jr ziyyqjrrl 3 m6atj,k z7-s8 oapacitor. What is the impedance at 10ol,jtnki a8y,7 j+z43r r rq-7y ms6jz00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor atn ,)zoo 921n6fvldluw 1.0 kHz for a total impedance ofl2fou 1n6vdl ,o)wz9n 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 capaci5he 3(p as)mhqtor at 1.0 kHz for a phase angle of mpa3(sqhh)e5 $40^{\circ}$?

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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 reshk,kkl 2o4g d+istor at 1.0 kHz for a total imp,g od4h kkk+2ledance 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 s3oj,o g 3l6e0q- 5vwff xktm8leries with a 100-mF capacitor at 120 Hz. What is the phas,o3g3xfjfqe0w lt5 o- vl8 km6e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coi r,b)wlsfl id4nzx;n34udp08mn 9(zsl, and 1.0-mF usi3wz m9 x 084p nln4d(d,;l)rns fbzcapacitor 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 resistori/3-0mf*w x rub yk:9ysc hzs /zse6+n, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit? 0r hyfzmwz /be*-3+y cuk ss9/nxi6:s

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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 30d;v(/u vcokr: W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wha/; :(vdvcourkt 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 eikr:7*boz69u 6u dh 6hnww8e series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powo8kunhde6:6ue*hw7 z i9 6r bwer supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for ui.;g5axz iml y( ;bqtu c6j8jw4) 7nga phase angle of x( )glqi u5gw i6mjn;;bytj.87cua4 z $40^{\circ}$ 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 mF. At9 r+ j q;amh68e8gcplf what frequency should the circuit be driven in order to have maxmaf; + qp9 8elghcjr86imum 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 W40yvh c3cc nsqd--w 8s resistance, 15.0 W inductive reactance, and 10.0 W ssvc3-wh-4cdqnyc 8 0capacitive 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 lk nza0o5;ajgu* wujsrb( 4**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 ofpljnc g8 u;eb+ bwygmv:06m 97n9b rjw,b3 3bu 60 W and a resistance of 30 W. What is bv:6pj+9j 8cglwu,e; 9ygr0bbnn37mb bu m3wthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factu(n ln 7,sdxhu*6ot0lor for a series RLC circuit containing a 50-W resistor, a 10-mF c*07n h(od xsu6ullt,napacitor, 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 and a 15-mH coil in serie. m)rl.k) hwcfs?cwrl).). mh fk

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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-mg82ota 7yqh(y F capacitor for a resonant freque 8yay 2h(q7ogtncy 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 fore x 7kmywu3z,tau/92rrcmd x*76qpr7 a resonant frequency of 1000 Hz?mupxa *ye6ur wcrz7 /kmq, t7rx3729d

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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 res4fl . k1-fdn14 pztmq jrh01zlistor and a 40-mH coil if the resonant frequency of the cfdh 41j014.mtz1nq-l fz pr klircuit is to be 1000 Hz?

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