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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 .u +/pllu)c8q6fy xtncv/ jt:flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that wcdquc 2qwm k(2bncb: 6h*6 a+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 ofonvy95 ogxu87 j7yv5u bf9 q,s loops of wire in a coil produces what kind of change on thgj5bo, 9v5s8f xqu79 v7ynuy oe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field thro:f7g2ygy a v(wha4cj1t; .pq a n/d3suugh a loop of wire produces what kind of change on the induceaqh3(d7apvwng 4ua/jf ygsy : 1;ct.2d $emf$, 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 c7 mv 6cq1j-o;ubo0h zxhange on the induced zm-cb;ov1o h 07 qux6j$emf$, 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 fryjqg, 05:y v19 u5 wa unwlmkxw8a;0brom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of a2u pb90g a0v-s +4whuqi1yo4agg 9trh 1nv2ran induced current in a conductor will be that which tends to produce which of the au4vrqbhw -o 9 yga2np20t1 +sa4h 09 rgi1guvfollowing 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 ban. t::3m2ok6e o/p1qiczf**aff u svxr magnet is held above its center with its north pole pointing down. The stationary mmeu nctvo ia3 k*os2* fqxf6:1.f p:/zagnet 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 1apq7uniofbh5j(n4 9 ofz:. j flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, then1:oq9jof p 7aij.h4n5(ufzb 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 vec(ki nhy .j+ *70 isqlpw-xmn/vtor points straight up. The magnetic field vanishes suddenly. When viewed from above, what ym-sjv7k/.(x nhl +pi*n 0 wiqis 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 in a reg2 o +mgggfe7d*ion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abomegd +gg o27f*ve, 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 ywhn(x ggg ;; 5o5tor4a region where the magnetic field points straight down. The magnetic field ;4xor;w g5(yggon5th 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 horizontadlnnv , psd:y-dsvc:9 0+k( +8kjutc gl table and carries an ever-increasing current northward. Two coils of wire lie fu+:k 8j(st, p0g+9 yddv: dvkslc-cn nlat 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 n2uem, *bpjm 8 v :qbj.;6gi:m pqit5fxorth pole entering first. As the north pole enters the wire, the induced current will be (as mm.ppfx6 gju;q ,* :5m2 vjqt:e 8ibbiviewed 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 co5m9 t:pi 7tqkx8mhtjaq8o g1/nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whatqmtomtg a:ijq78t15/9 hpkx8 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 constant angular speed about an qmg 5* yjbyv of++;4btaxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriy+ bgtmf v5 +*4j;bqyoentation 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.-in(.i3 gak1 )gu za1 rfqsc4o
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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 l9)xx yb7nzdpr , 9ij)$emf$ 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 fi kkr6a0bry*nh(x )yd* gpz;o9eld. 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 direction) is moved northward wk ic*ze)07f .em4sh zat constant velocity through a magnetic field that poikfe ).is 4zm h*0c7zewnts 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 constant angular vaf7lh-5y ,pkte p) ,kyaek+;6smaj c /elocity $\omega$ 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 generator8g 20 ojerwhu6 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 6/tn + 0x-bf s2ynxv8np0 revolutions each second. The frequency of the nn f0sx+-ptxnyv/2 b8 $emf$ 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 8mjvh4yvq 6q h7v s*u2)-xiwt6mi( p,zm(rj kused 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 devkqe(x rigm 6plr4n8b0,zoe. 4 ice 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 cod2-r6 qgjz g6a.ork 5eil then it is .q5 -rzg 6 jko26aegrda

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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 pr( d zs,4 r qecvgyc,4j53rj2bqimary coil contains more loops than the secondary coil tc ( b3gyqj4jer,zcq2sv5rd4, hen 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 in3gffi 1qad1/o1nxvy5 put

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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 cuo02sveh+ kn8 s)4sbsircuit,

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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 con82xn.qrqugehj on* 29 nected in series to an ideal battery of constant terminal voltage. At the moment contar n 28gexnq*o.9ju2 hqct is 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 ind/7dzo 0m aa2p/0a idiu2np ;vc1r4vgauctor are connected in series to an ideal battery of constant terminal voltage. At the moment contav/avpi2 4ci / 2anuodg70d r0ap1zm ;act 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 resistancexa)0 fdpdvr, w,v.14eb z)cvu 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,p 3frb.zoqd4 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 c:l;rf8(wx )nde--hn icyso) in series to a battery. The time constant for the circuit represents the time required fn-l:ho8(w fynsr; x )di- ec)cor 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 connecteuagyr(; j, 3 cqm)a(2vl/n elod in series to a battery. The battery is suddecqvol,2 yn(lr/(a3;a) jge munly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exce6exup nanu:r5o1:+lyc 7zot - pt:

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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 thisd q3pn): 0 g khvzv5knj bj)+mkov2-u/ 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 conn lx0hv4 b 0zve7l1un1-mrtj 3cected to an AC power supply. In this circuit, the current4b v7vhlzmje1xn1ut r-l003c

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the freque y1uq8ib)vq1tf.2t+ l 4nasqr ncy is triqai q 2ylsruq1bt41f t)v.+n8pled?

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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 ikl v;m 76355lhaep vwdnductor is doubled, the inductive react5 k3a5v6 lp dhlewvm7;ance 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 acrosbp ;2mc ix6e1ps an inductor approaches zero, the inductive reactance of 2bipc6p1;xem 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. w5k 0 rrv0r;suv ftn66.briv an AC power supply. In this circuit, the curren fb.6k6s0r0t vrir 5vu;v wrn.t

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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 fresm2o1ych)r0 uq0oy3e3yr,x m quency is trir1q) y0hmm ,yo 3u0r2ec3xoy spled?

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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 approab dzst3n tq8mww;g:2n(xa go6il1-k +ches zero, the capacitive r3i n6og- lwt(+qdn1 msw;: b2a8gzk txeactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a.pjq hjopg/1/h vs:+ f RLC se p+vsp/ j qh:gj/fo.1hries 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 circ2.hq/0-nv0x iptryl*db1 hy nuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if g-qpqb ; 5rd;r09ufu a374u nwnsp7iv R increases. When is this statemvur fapp4bu757qgd rsq -i0wn un39; ;ent 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/:j( my3/v 8k(dviizor .yx qncuit 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 incsu1l 8aed bbhhc5 c w;a23(ps4reases 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 seriev22yjtu:,sv-wnb s 3 z/eb5mws circuit, the resonant frequency of that circuitty2 u5bz2wv: se j/3vms ,nb-w 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 i8*3kv t xn,-un ; ppoi5zwo9wls 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 RLC zmxldc-qs*q362pz+f w; zi*a 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 radi q94/ra4qzjvl(byk sj4d .hk8us 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 tkkhd/ 4qa(bv89js4 q .jylr z4he loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is gw1slm,zg8 ks4 cnd: :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 a:cds,n1:mlg w8szg 4kre 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 is ),xyr(; 6b odu-ryqc :z*vcyn 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 veuccrdoy:6 b vxs,- y*rq( zy;)ctor 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 loopy7-*zlw wfjiz p;4yr / 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 chafgz 65di y8xsg/ws;+q6.ibz5cg 5 rfj nges 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 2kjvr2)cn q+2q00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value kqcr2)j n 2vq+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 tc (1bp ekw63,np5ue dqurns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area t,b7p9 jt: xdz$0.20 \; m^{2}$ 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 flieq+x 5cu.bx +pjs horizontally at a location where the dow.+xpjuxc+5 qb nward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2lqqd6; 7j9b yhp .lh2j.0 m long rotates at a constant angular velocity of 2.0 rayj.ljh 7q hq;b92dl6pd/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 generator has 50 loops and a cross-sectional aj;kgfv wg;hw*/* mwld4c. 1mhrea 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 wirrak,-rjsk , i3g0u be7e 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 cm xjlb0j7 x5)b (2und/rw :t clf- 2o+ll1bk vqjlong and 8 cm wide. The armature rotates at 1200 r+x 57l(bcv2ut -rw0bldjk1fb/o nl2jq :)jxlpm 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 87, wosm+e bbqda)3q i100 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 generatori+q65wr(vois -kr9fxp8qt(ad 2e v x8 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 coi8 vqqs 82o59(6(xivd xfr-+awkrpt eil 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 a maximum 5dj c32b:f;aziw-kb h*l+w8ej40 xptm1 rn gy$emf$ 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 operam4l;se5/+(iknkkwv p mx p-z,tes 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 motot57e j(up;ltff61u )x ckclg( r have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speedctju; fl 7lut56((cgpe )x1fk it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected tocm3wwv 0.c/ gq a 24-V power supply. The operating cwc3 vq/.wmg0 current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co(f2so 1ukk1bh adf2l 8nnected to a 24-V power supply. The operating1l2fa fs 2uhd8kk1bo( current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V po:k- neyw;;ixhwer supply. The operating current is ixw ;n eyh;-:k1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volta ad7i b+ a,v+p83rsyuege 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 primakl7yor,n 59;dsfo6a7 a(yi xyry of a transformer causes 14 A to flow in the secondary. How many turns are in the seckoosdy 5rxyn fiala9y7 ;,(76ondary?

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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 td3 vzgw t s2un g/;:gh7lg(lf1urns are necessary in a 110-V primary if the 24-V secondary has 100 turns? fg/u(hzd lgnw lt;g1v372gs :

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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 andh9)pj0ynqjrnd* v 1z1 a 2000-turn secondary coil. If the current in the snd* 9yh jjvz) r1npq10econdary 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% efficeuij 4cw 7ziicwd2720 .ev v-giency, how many amps at 24 V can flow in the secoe j7cuv2i. wciie7- 2zg dv40wndary?

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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. us j-9fal;2rte h t3:m:ue8 yqThe primary coil operates on 120 V. Whaf - ja9h;:3my:tus ul28etqret does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prim8w 7:fil wn2leary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pres28nll 7wewf:ient 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-.5zzz gifkzhn5giq3 :os0 h 5 its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A 0g.53i- sn z5hqozz: iz5gkfh is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and 2sr4 s)yp47(hgwoj4ps6 bv ucwzlb- - its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curpw2h4 4buw z4y vsbrpl j)s-gc7- 6(sorent at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu w.nbzvlj+c-5n -sk7yrns. If the input voltage to the prinsj5nkbl7.+-zv c wy-mary 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 i7h( bkc7lkxu8 6 .c /vtrmz3oand its secondary has 200 turns. If the power inpu6ukc m7rl7oxvbc(iz 38 /.h ktt 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 7yhp zr+)0 5wsffj3ds120 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 of turns in the secondary if trf+pw35y7zsh0jf ds )he 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 producesq0tb, jv,dfa.h )l7l j0q3ott 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 0 ,3b qlojqt07tjldf )hv.,atresistance 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 8fl ucq./5yq avoltage 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 vfqu calq./8y5 oltage 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 503 mc q +m8sa+6cb2ac:dzbsr -f si-tu9 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 transmisums tdfccs6mab q-+sz98-ir:2 c ba3 +sion 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 resia q(nem ;a6 qq7gx1b*wskm+; tstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the t1qn +t7s*x wb;;ek( qgam6 maqransmission 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 l 8efvr6 f;qauuib8mo:+,9p lu xyw8al c( 34jyine at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instec+q8bl 9r; lewy8ofafpm 4u yaiv(xuju:,6 38ad 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 2 .)ehp;)b rj3s+ ijdqa0 A. It is to be transmitted on a line with resistar+jja) ihqb )e.3dp; snce 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 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 much koq)my)iil 6d6xp x/ /energy is stored in the coil's mx/pqo6x d)ky6ml /i)iagnetic 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 contkmk /3dmk (yq6ains a 6.0-W resistor and an 18-H inductor. What is this circui/ (k3kd6mk qymt'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 volahfhj/dal ykm;8gxe3g/5 b8: tage in 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 Akw ho9r -ve0l0 gt78baC 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 outletb;1 pgi v aq)*62telqnf6/y5lml m 9ci. What is the resistance of the la26ci/9y lp6v*iqe15 t q) fbmagll ;mnmp?

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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 curr*c b0z-+ *mfn*s0x bv3ibuglo ent through the resistori *v0ls mb 0n3 b+zf*x-ug*cbo?

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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 y** rf 0zhy.kv/9 xcxlpower supply. What is the power dissipafxy zh0lryk9**.c/ xvted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rf onp *42cvp0desistor 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 residnww2l/ zlp9(stor 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 re.9slz f7(bhog:d 8ptfsistor 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 atii iks)+1 qkk) 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz?crq:1f q0w/e+d h yi-j

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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 inductlxozm(tu8 -lj.c+3 q(xk -wiq y n1fm1ive 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 fo*v xzfklel29 j b(ufieozp 3r.35/ kr;r 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 frequeu)thi :dq2:s);br1s8ako f wf ncy of 20 kHz is applihu awti 8 b) q):2rsodkf:1sf;ed 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.v4o5fnnokv8- 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 0tbazb0 *ppp;;5c pn3 eyzq4zcapacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W 0jabefj)g dn 3p4o7w /w:0shr 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 k)*gcva (e )csa reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0c1bzcau4),tg/ v6 pm0 31y aryammt k+10-mF capacitor be 100 W+u4z3mm0ypa)1c t,c/g 61ayva mtkrb ?

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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 througynjcq/ a s,01ecz3d:ih 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 circuit with 12.0 W resistance, 15.0 W y)5svo hnj)a3l3ajp0 inductive reactance, and havpnys )35jol )j3 a010.0 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 150rxo,gh,eptn tp/ j h(4 lr-p1:0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are copnohr4 :eg1/(t-,jr,th xlppnnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if 9avxc ;k:upu:a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec uu:9ac: x;kpvted 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 c-+;9kcz(enz fk0hsvbdbyvyc(+ *5cfonnected in series with a 20-mH inductor, what is the impedance at 1000 Hc9vf+ykznv(hcb5*-bd cyf0 e ; +(szkz?

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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 connectezjk85e doq7 z ups qol(1)3.shd in series with a 20-mH inductor, what is the phas losequk5pzq73o.j1 (s zdh8 )e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH uycpj)vf 91v6l yd7 2wcoil and 1.0-mF capacitor for a f)py ljv6y w9vd7cu12 total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacita02 : wwzjki6f4y 7+y v;nrosvnnces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance 0n ki: + zwyv6fsr7v; 4jyo2wnof 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 a;bry ,o ;.lcz8gh 41lk4rlr9ndr8owat 5000 Hz for a total 4 r glrr8;rbozhc l.9,yakdl; 41w8on impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be pynjcrs3 9*51;wfug d vut in series with a 100-kW resistor at 1.0-MHz for a tota 1dgywf*scju3n r9;5vl impedance 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 y+mkffpclt yy -78( s7a 20-mF capacitor. What is the imped7yf(tmf7+sy y-cpl8k ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a m0sp 8 + kiwbmro6rt6 lg)8w,t1* btzf10-mF capacitor at 1.0 kHz for a totaf)rbgb0tlz8ms+,tt kw68w1*op 6i rm l impedance 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 f8 ;t4zjp mpxo)7f fw:ior a phase anzfo4tp :wx ;)7jfmp i8gle 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 forqa/-fn7 cv g+ 0ph xsryur,k)2j c7id- a total impedxa0ukhv)d72f-/np+rgj -i 7, qscy crance 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. What i- mirqs9-klczd6 v l;4s the phase angle?9mzs- l4d q6;lv-kir c

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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 coil, andst; ;ke5,j,7j lmlh w)ozc1id 1.0-ck 1sw o)l5m;ht,edi,jz j l;7mF capacitor 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 consistddfe7y 8 q. lck0u69nos of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wha 7c9 qoydndu6e08. klft 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, and63tsenpy 55q s3 k sp:i khgy*u4s bv,fj*)3ee an inductor of inductive reactance 30 W are connected in ser3hgjk5 eebes)i35y,yp:s*v3pn f * s4 ukst6 qies 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 anglemh3g-0 ec 4 c)upw3ii zeue2k9 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supi uh)e cm3 we3p zcg2u09-i4keply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessac7:e.m f0u3ox ojn 2jmry in series with a 500-W resistor for a phase angle of mc3eo.m2o 0jn:f7 xj u$40^{\circ}$ 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 wx-:hsf.+*7 kczltsmn b- y-r.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from tyt- m hn *+skfb-xs:c-wl z.7rhe 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 s9pq dri zfja*cq;;gw 0nm2+(, ify wi5eries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivn5rfa(+*zqm;w;ii2 id 9p0,qfg wyc je 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 zuo zzw)m-* k2ecd66g 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 W and a resistance of 30 W.n7q+ m2rd)dly What is theq l d27+)rdnmy 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 factor for a series RLC circuit n)gj+ t-8l ibccontaining a 50-W resistor, a 1ln+)c8- g ijbt0-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 ca1dwn 3uit9 tb3pacitor and a 15-mH coil in series?9w3ntb 31i tdu

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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 resonant frequw+m*0q9n mmb zn f.q;yency of 10 kHz?+y*mm n qfq9mz.b0nw ;

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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 3)fk:wt8evd8rp4 + -kf gwgiole+4r x in series with a 3.7-mH inductor for a resonant frequency 8eigd 43lxe kgf)w+rr-o+k84 tp w:fv of 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+da-(qi tudy * placed in series with a 30-W resistor and a 40-mH coil if the resonanyidd-q*ut (a +t frequency of the circuit is to be 1000 Hz?

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