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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 magneti q4 zr: qdpso3dm/-jc2c 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 sta o(suwbahj6gk :q 45j99gyx:zn1a+vt tes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changeu 9 tv,k5:-tnvn,dicq on the ind dtiqc5un-n, 9,:tkvvuced $emf$, 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 th.z/ toj8uc l2p1z tl6drough a loop of wire produces what kind of change on jot8 ullt2zz/1dc.6 p the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ortn cy o2yjp8oaaq 417 uk645nn the inducyop7nq 1tau54ny2k8 4aoj6cr ed $emf$, 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 from9,2fkmdax* / y4cbr jb 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 dirdy1-t,*fl s9d lh-*fzt qrdq:ection of an induced current in a conductor will be that which tends to produce which of the following f-,ld 9q*y: thdlz d-f*rq1steffects?

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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 horizontrag/0k*oii6stt2x ngz27wsn v5 : *hfal table. A bar magnet is held above its center with its north pole pointing do*ws 2 n75a x tzg:n/kt2h0sif*o6virgwn. 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 .r,hzrion9o99 :pmyson a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet in9yms. oh9rz r,9n:op iduces (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.k oy;8h3 vzre field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sehyr ;.oz3vk8 ense 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 q 9y9i , a4u1antf4.0gbhciqbtop 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 of the induced current in 4h,9i9ibaqac g1 . 4 uq0yfnbtthis 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 horizp1 *lqaiiu3 n/. 4 c 3whx;urf6ct-gdwontal 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 the induced current in this coil as the field h1;cau l/.g6qpw- niwu*43ri dxctf3disappears?

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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 andfqw50wsk7 +h a carries an ever-increasing current northward. Two coilsqs wf+0h5wka7 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 ente*f/ 7 hzuji3hiring first. As the north pole enters the wire, th*jihuh3 z/f7 ie induced 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 angular speed d12mler12 vsesrl+ 2q about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriensrl21+e2e s2 vqd1mrl tation 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 wr/nu 6 yxlcbm01bmy57x **ibwk .*vzqire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pointsnbummb.x7/x v0 *5yrc61wz lky*q*ib 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.3n9mouc)nd 6b3 ry.,fh fs t.l
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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 th+2drpp z: tr8xr /( so.a3+ m,he niakglxu,3vat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.sr 000eax 6 d5a.ayjyg 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 directix)fq,w gcues,0z:sk 8on) is moved northward at constant velocity through a magnetic field wc ,8zsxe g0k: )qs,futhat points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a consta4ug56gu rs1+/tsw7+.wk gb7oxz pv an nt 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 transforhiic5 2 xnq97htamc;4 ms

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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. The frequub u5eef6:ggqi l*cigco 9+f18+o4jz ency of thei:e6c*g luiz4e+ogubqj89 of5 f +c1g $emf$ 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 devih4 8z;djh9uuy6 ,h sqgce 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 deviceh7o:f/md4 rn4 ;kkmwi 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 uss m4)zr30 lgprimary coil then it is sz0gr) l3su4ma

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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 primai5e .ls( mmi9dry coil contains more loops than the secondary coild (5 se9miil.m 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 power if9j8;gf 2j ix pp2h((;/: ygv tj jubypbd1wb/nput

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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 circzj+g4fxy vw6) uit,

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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:nxlpy( 3x-ucva*: jay-eg: l ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagxnvg aa ly:x(u y:el: p*c3--je 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 9e kwhbp jhgq tw(b f zr1f00)t;6e.a.ideal battery of constant terminal voltage. At the moment coh)w(.wgfbzhtjep q r6e kf090a1;tb. ntact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an ri9dk1-arv*1raoy )pn+ p* ,vt *doxj$emf$. 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 sp(,mih)rp7 k m/bd(wwith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time cvb(8p zv8 t j3voo:g6nonstant for the circuit repr(gv8 :j3 o6 otpzvvb8nesents 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 aol*uh -ph ;hmhr9v(8m re connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time r -9*vumh(lhop hh8;mrequired for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excepopd9;2lb m4k g q)4yrmt:

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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. On1/ dt+;f r-w obmebaj9 8x*ctx 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 anmvzt( 4cc7x ea+,* ,xsv kxb1d AC power supply. In this circuit, the curren 1exsx+x,t4, cka7b zd mc*v(vt

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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 cir2rc* c+urhl b:2xhj5q cuit changes by what factor when the frequency is tripx5+u :r jrcc 2*hlhb2qled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, zfv9 kfl-+1/r b1rohjthe inductive reacv f-fr/r1bk ol1z+hj 9tance 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 an inductor appr(0r*;r; lxo)9) vhzduj smz mioaches zero, the inductive reactance zrhi)m*s du(l; z vmjxo9);0 rof that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thk r mom/2b3a4rb5ypr 6e curren r 43borr6pmb2 yk5a/mt

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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 factw)bh e (1bz8t 1kq0- km-iy 5txqphjf,or when the frequency is tripled?mq0btq1i(e, bw8k5 hjyhzp) -t1x - fk

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capakg9n .m yanlnj( 3.(f-xqi8+g7dw nhwcitive reactance of th njlm7hgw(8wfyakn .(.q93xin- +gd nat 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 voltwqndiihr7 3 y1bl sl 3,w1/;icages of the inductor and capacitor in a RLC series c/1b,iyrsh33wd7 ;iwcq 1 llni ircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as3 b+y6d6ap ,,dbqjtma 6b;6c pkczu*l $\cos M = R/Z$, 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. Therr5* r x 7szif9ngf)r/ impedance of the circuit increases if R increases. When is this n)9frx *z g57/rr isfrstatement 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 circuit increases iy/ + ut/lf a3c .at:fgbush 6cyhf;h8+f $X_L$ 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 im*t5 zmn wnter npg,b8,,k;uo+pedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu;tvo6 )y4sm s2tt9q phit, the resonant frequency of that circp;m)4t 92sq yh6otsvtuit 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 dv( -1n-t- juz.acrt* (sln nqu zsj,y8riven 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 RLC circuit occurs when p9g6j u:pbl)bl)+cv* wl /jpf

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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 49/ pa+k/lfi,dw gzdu/v 3s dc0.10 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 magnetic field vector are pasplw+/d/3dvzdui 4 gck9/f, arallel.

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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 ita5l6eis e*o:b :pu y*n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the p6tea:y s*l *:bieuo5 loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatild f8v7s1 a +q,hwzp-dng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the ad1hv8+s wz fp- ,7ldqplane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjussi;l;n uv o/dg/sb.1 xtable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch pt+5/qd 6ahkcanges 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 i:fr.5pf3w7g/ih v j) wf0 sjga square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coivjgwi)7fsh 5 r/. j3i:0wgfpfl. 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 andkqjsuv :2a72z 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 anjc. nvqapb++m /a(lu)d 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 qwusm7m)/u/hnig).awhere the downward compon/g smau/.)hqmw)n u i7ent 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 vedc:+7n.e,fc fcd r/ 7i auos(klocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fi i .,/fcen7:kra +sfdu cocd(7eld 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 haskz n8gv)fuct yatg:ivn6563, 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 turnsukk 6 3whr.l-n 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 r0ycwh1d 0.b thu. g106dt9e tkjspra4 ectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature ra.0jtsy 9pdtg1hkc06wb.41 t eh 0rudotates 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 o.zn +v7rbsib3n7o q q9f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an ou m- 1fj0p:qf(k2 itcwh+.wmj gtput of 12 V maximum when rotated at 60 Hz. A magnetic field1khjf ifg0q-( c tjm .mwp:w+2 of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with aao q-88,va qpght d(y: 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 nm5x3ddcxt6j0 dp3 9ktpmm)5. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a e,h *.y e8uscao8c m.aresistance of 6.00 W. The motor operates on 120 V AC, and when running at full speedm, 8uoy8 aa*.che ces. 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 internat4q0qg/i3*y5o6r f3e tbvtxcl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the s*3bytt34gqirvfco/xqe t6 50 tart-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 6.0s: ;2th4g-y7z fp qihp W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the baipzf2 tg 4hq:-pyh;7 sck $emf$ 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 resixj93a( t x b3 ;pf;ms.eu8pcssstance 6.0 W is connected to a 24-V power supply. The operating currentcj ; 3ax;9pepbutfsss3x8 .( m is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed .kihca1vcinz8 yxu54(bjb 18 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 o jvx6 -cs1e-aef a transformer causes 14 A to flow in the secondary. How m-sje6caxv -e 1any turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if f +c ecg5n*y+qd9 oz9qthe 24-V secondary has 1y+d9zq9eq+c5o* gcn f00 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-tur/+;izy vqe2 -b hhmwj;9qv f):w)z sltn secondary coil. If the current in the se+)92 ; /mlzq)ie:whvsqh-j y zwvf;btcondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100%op;fh+q tkmalm-3e1wgxi1,, efficiency, how many am q p ;itwl3,1aeox1fk, +-hmmgps 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 7500 V at 12 ohwi i0c ji+6r:ehj40.0 mA. The primary coil operates on 120 V. What does the primary drawj w hr04oii: 6+ih2jec?

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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 ty zhk). vwxq;m * *.ke9n5hhf60 turns on its primary coil and 300 turns on its secon khh;)vxzteqhmw* k.9 5yn*f .dary coil. If 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 on its primar2dnks h0):9cyl 3 fwaxy 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 thexy 29ks:0nwc) d3lhf a 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 turnq jb/hfx(jo5;jj vh8 0qapt ++s. If the input current at(ba+jpqhvjf 50qh/;8txj+ oj the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnti7 8zqmeh/h0e*4 f sts and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect8 fz0teh4*es/ i qmht7 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 m he:85sfvsp7kf2 7oasformer 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 se 8p77ks5shm:f vaeof2 condary 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 currefd8h- e/ r1+ssb zbed7nt 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 number oezf 7ed1+ b-b8rs/dhs f 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 3 2cym 2 uzmt/tdknz*l*f wh1dmw33g160 A of current at 120 V. The voltage is usually stepped up to /w *mz 2tkzyh3 c1m2tdd3fwl1m n3*ug 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.

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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 voltagv, p kmd ug w6sl.q5+;l4 ksh4luvu7y.e is usually stepped up to y.l5, q.v sk7l d+v4uush 46 glmpk;wu4500 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 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 resistanowpu34etihu d91;tlb( ,.0yiu 4lfemce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating oe 3topt9uibu; e wum(4l, .4l0h1 dfyif 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 line 50 km long has a total resistance m, hfz*4t *nxywc/dqh*3rn.(za c*h :*b kwedof 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissdrah*czn4c*m heqkz *t b*:x,./ (dh wnw3f*yion 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 downj8g8xu ,5 d/ytb: hsxg a 6-W line at 1000 V. How much less power would be lost if the power were transmittedb5d8st, gx x/y 8guj:h 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 44, fv/zks5 z43 jbqju(c0 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 losbk5 j3j(s 4 zzq,cu/vfs in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How m112bmxt1m m eem/;jyhuch energy is stored in the coil's magnete jyh121mmexbt1/ ; mmic 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-Hxer ow m(6*lwlt5ba:bpb ;52v inductor. What is this circ ;52:*ea bxwpow 5r t(bmvllb6uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vo3jxvmhyf tm- qs2,c06ltage 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 1207q*7 ;oyoefdw-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 resistajz;)nsw mc3j. .qf)bhnce of the lamp?csfj..; mz3j) wh)qn b

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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 peak2jkh,ma :j.i q current through the resis.jqa 2,m:i hkjtor?

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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 eyc2 9w-eyn .wa 120-V ac power supply. What is the power dissipated in w cy-.e92nwey 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 t1 miug) 2n9kpa 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisb -wx r:-f0(i2 nco1q)qtmca dnm3:l ntor 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 r *-k*rbn 0oz0msnro)dv z *mr.esistor 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 inductor at 60 Hzd(u18hh4 mpag 3fdy3v ?

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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 reactp9(p*w2iogt/ cl7 tikw c+*wxance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rearl7 exem;fd +z9h8x* ictance?

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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 indu:a2zbny i*e(x ctive 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 60-9zh -9 acarjr-mH inductor when 120 V AC at a frequency of 20 kHz is applirc9j-h- a rza9ed 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 cjnw:1 2e) zrquz,r9kwoil 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 capacit5 d9janybx98por 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 haven 1qt5 dl*ytv+h pfx:jb*5df1 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 reactance of 1200 n+- xi*eichu0 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 d5tyq 8)cpj jm7xrp (0of a 0.010-mF capacitor be 100 W?7jt0 8 p5)p( ydqmcxrj

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz ajp;tl-3cu23fwighgp8 w 3zw- nd 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 a12xco.yl 78omv g7j 2y;kc3yc*kfv nbc series circuit with 12.0 W resistance, 15.0 W inductive r7yn m1yccc j8yvx klv3ko2go f*.7b2;eactance, 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, 20-mH coil, and ua w*ro360pd/nwex0g7w +kd c 1.0-mF capacitor are connected in series?dxc+ 6 0/gedowur w k*wa3p0n7

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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-h7pa*fx :r p-ymH coil, and 1.0-mF capacitor are connec p:-yx*hpa7rfted 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, what is the a60 xq)akr 9ayo e4h8fimpedanea)oqx968ya4rakf 0 h ce 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 withs;cjbjo (o50suf:i9l 1 q1si y a 20-mH inductor, what is the phase angle at 1000 Hj1jsi:f obs(uiq;091lyo5c sz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH (ap;dxamj) u)yyss*0cu .pl0 coil and 1.0-mF capacitor for a total impedance of 10a;0al d xj))*. ucss mpp0y(uy0 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriev4adal*i aou.z) a3,n s with a 100-W resistor and 15-mH .in)u4 av ,ao3ldz *aacoil to get 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;n0yfp:+ k l-jx g8:x(ev brzb put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40008xl:fk0vp(b;rnb j : xey-z+g0 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 1.0ziiq r q,1:d1t-MHz for a total impeda dzrqi1: q,1tince of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF e n(y5ymn ,ym2g43uvncapacitor. What is the impedance at 1000 Hz?g u3nv4m( nyey, n2my5

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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 ctzupy6d5eac7 r) (j a2apacitor at 1.0 kHz for a total impedance of 45r(ytu )j2dac 67epz5 a 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 ser , 0ui1k 8xxdp0qxbi;nies with a 10-mF capacitor at 1.0 kHz for a phase ang 1n, ;i800bu kdixxxqple 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 f+u1;q tj dkr8tor a total impedance ofkjq1 u+ t;d8tr 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 3 p*v1h7nbbmpcapacitor at 120 Hz. What is the phase b13pn m* bv7phangle?

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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 coiqwh )+bic 1o/el, and 1.0-mF capacit /b1 +ceqh)iowor 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 resisfi h2/ 4ex dqcfc0r3i5tor, 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 circuf/d2x ref h30qi45ic cit?

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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 /gmygkdeq9.7 fw(ju ts;/,nv reactance 30 W, and an inductor of inductive r,q. evgdu;9ywf/j k /(7s mngteactance 30 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 circuit containxssf o*5+dgxl2 q3. rhing a 50-W resistor, a 10-mF capacitor, and a 0.45-lqsgx f 23h ors5.*+dxH 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 o: /m. o hum7ql6i1j pm-eap:xseries with a 500-W resistor for a phase angle of 1:m/oj i- m:el.7 qmpxaop6 uh$40^{\circ}$ 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. At wu1 7x: gfo8)uwumcj q8u1, amlhat frequency should the circuit be driven in order to have maximum power transferred from the drx7 ,ogu: 1mf)8 c8ua m1quwujliving 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 withi;6tn p.q c8auv1(h sbzi: m(b 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react ( it;nsb1(:aqv8um6ch zib p.ance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit i9 .ogsmpaj-sn t e.s.p0 m4l+rs $63^{\circ}$. 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 oft,h(kviv 6:h w 60 W and a resistance of 30 W. What is the powht,h6w iv:k (ver factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuitp7hb -2tl, aql containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conpaq,l2 l7 htb-nected 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-t sg7jm355u c0y rhb)tmH coil in series?y7 55ujrt)30 chbgsmt

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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 capacitory +yt fe+19dnm for a resonant frequen fyde9y1+tm+ ncy 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 re v5 jv;p6vytk6sonant frequency of 1000 Hz?;5jt v v6kypv6

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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 serit f1bz )+bp. 0od 1p9iluelnl0es with a 30-W resistor and a 40-mH coil if the resoe.upfo90 bi1 dl0 )ln+bzpt1lnant frequency of the circuit is to be 1000 Hz?

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