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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    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 unijpv,w1t .v w;3pa nk5fts 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 induction states t vv 2khg.rzqqp/ 5w(f/hat 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 o9+qe q8ppo; pproduces what kind of change on the induceoqpq8+ op9pe; d $emf$, 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 througsyayzdro1e-;2rv,n v(ph:;sh a loop of wire produces what kind ofve,(1hdynrrpz oa2-;;:ssy v change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of fde0.kzv:e r0wire produces what kind of change on the inducefd. zr0e:ve0kd $emf$, 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 froc( xrc( 4a 15egzldjn*m a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an e.2 yq3 e,9lj1htnttn j /(tse0.ebovinduced current in a conductor will be that which te 2h9.oytj b3e/t e1tj.e v qtn0ne(l,snds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn f85yec :.jallet is held above its center with its north pole pointing down. Thejlf: ae5y8c l. stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a ds u+p*d w 5ac8j.3gq5szrj/dbove its center with its north pole pointing down, and released. +55r cjjd38sg/ z* dqa.s dpwuAs 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 t2b5hpxfd xg:)lum 8c32x(hnwop in a region where the magnetic field vector points straight822 p:xd cxlnx(h fh)3bu5wgm up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in t,br nrg .-hh0a region where the magnetic field vector points straight up. The rt,h.bhrng - 0magnetic 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 reg;rfp e)i v6cx7ion where the magnetic field ;peifv)6xc7 rpoints 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 disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-*ypvtmbp5 1(.twj39m d * anlpincreasing current northward p1jlb3vaw9*pmn.p t( t5ym*d. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a lo g+a isnky4562f k+yrjop of wire with the north pole entering first. As the north pole enters the wire, the indg+fjy2+kr54yi 6 snak uced 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 angula. o,-yyzo0 pltr speed about an axis whose direction can be varied. In a region where a uniformz .-po,0ylo ty magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed nao9abdrck2iyc3 sd 97prw0 m82kp.1 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 axis of kp2d.wsr8omk b1 r73 na9p2cci yad90rotation 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.j+ifk v:7 ly0z
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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 4s1ffry8 j73 xgr n3wean $emf$ 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. Th d*/qt3,c dhbtc+l)k te $emf$ 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 direnwne+- -b ri5 n9kr5vrction) is moved northward at constant velocity through a magnetic field that poni-rnrw5r v+-bke 9n5 ints 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 rotatuloo:,b cg w.br 73;hhes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfo0 dg 3pl3jut /a0y30 qtex7xe/tngf6( 6xrxtdrms

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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 frequency of kzupxz ( 2ac ouykpho2+*f b2u)/(z8gtheck+f (yu hauo(*2pzz2xb2) kgpu/oz 8 $emf$ 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 de2 y5b w.vuyh0mvice 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 deviacq(os8( 8dor;wyj4 cce 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 containsa mc i ),f+m4ogfm01eq more loops than the primary coiqg 4)0f1 + mmiecfoam,l then 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 primapoui:1tw 6h,fry coil contains more loops than the secondary coil then it is o:1uiw p,6 ftha

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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 j;i428 tn+k5:.:pzvd v7fuxhu o bm woinput

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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 circuk*t 8u3xe-uiqit,

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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 seriew (1fh vmak( )r00guits to an ideal battery of constant terminal vovmg1u (k0f0tri)w (ah ltage. At the moment contact 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 inductor are connected in series to an ideal battevq-rdv,f a 1us,i* 1cmry of constant terminal volta diaur-mvq1 ,*c1 fvs,ge. At the moment 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 inductance L and resx;wtoh9 ;qse+ 9q gw75hpgif(istance 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 resistance4z,c 9qpq ebsd5i,zm4 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 d3h( +5;whdxs1 f/pjq: bxmsxare connected in series to a battery. The time constaq:h 5p xxsxw mhf/;j( +d3sbd1nt for 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 connxae(rf*. km5ob / cplr07xyi8d )0vujected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of t c7r5.jb(op8xxdy imlu0 fa/k) 0vre*he 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 h jwglphg 2z(-5ave the same 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 xq8.8zvj kuhn0ut5s .sa zf09 to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit,41 z,ucoq+ js5ao )mit the currentj,)tsmoqio54 u a 1c+z

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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 freq+n 6u s6tuno1vuency is tripled616uno vtn su+?

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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 wahk5rk 5uz-jys 3emh0nq+98 is doubled, the inductive reakhn0m3u9 zq5wesar+8jy h5 k-ctance 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 approaches zero, the vqtthgy./)z( -aga 6a;zl9jninductive reacta tyva/ zjlt.n-)q( ;9agzagh6nce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected tiet 2t, 9c+rzdo an AC power supply. In this circuit, the currezt,+r ec2 i9dtnt

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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 fr5tmri. j bu/ugvgto- x 2*92uactor when the freque92umvrbj uuo5r / -x *gttig2.ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC v0v3uhc 9 fa.w as-p.qgoltage across a capacitor approaches zero, the capacitive reactance v. 0q.fg9s3wau h-p acof 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 inducto vcrq )t 33pvtx2hezso*- ;iui+h. s)lr and capacitor in a RLC series circuih3ite sr)o-+s v)z.*hpliucx2v 3q;t t?

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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 azu::vpsjmzc d /aw35v-kj8k l/n/ t5ln RLC circuit 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 o kwq1f*(bk q+kf the circuit increases if R increases.kkk1fw*bq+(q When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. bpmsu ( 13 z+v1af4tu cm1y ct;z8e:xoThe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. i a qbb 6qz7muq.g8 dkui67h4s(9oy9 m 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 and the capacitance both double in an LRx1iw28d n wa+pe+qq*pC series circuit, the resonant frequency of that circ pp2w8 i+ enx+w1*adqquit 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 tzzl: ,)f 2vhkohat 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 RLC circui rzkq;n8p;vq+8 pbb. ct 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 0.8c/1+ 3ld dmuv2yo apo10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of 1d/c vloda3 yum2o8p +the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotaq vy;.(r3tcu -+i neq2a rpvu.ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti+y ue3vr2un q;r qtpa- c..(ivc field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of bfh*wvy :rx (/0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mvbwf/hx *r: (yagnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singlerahwc ; ;4xf,q+jxjj 7 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 changes fue8h1 iv(h2vmh / et8zrom $4.0 \times 10^{-5} \; Wb$ 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 o;yr y x- 007vo4kfyyiqn 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 va ior-y7 4yy;0fv0kxqy lue 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 he i p;ds/vh2spt5j. 6and 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 andkok1; r1cyn gk7-cs(s 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 fv+qyw s8 3a1whlies horizontally at a location where the do1av +s w38qwhywnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocitjehxr 5b(fk)/ wig x)ggz-gk.mh; )e 1y of 2.0 rad/s about a vertical axis througg em1h 5;xije)h /kg rfx.wk-bg))z( gh 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 loopsfj91ke/ d d eshrr90;q 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 turnw ;h,doqk6a qmu ;t-4vs 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 802 fd8dwnr;* ly rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abodrf ;8*2dylwnut an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100+mq (v9,zl4 oqhg mj,p 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 output of 186rd,bgjrho 6 2 V maximum when rotateg o6dr,j8bh6rd at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gentfvh1 mc/q;.l 2z-jxterator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a re);w1kfesye+f q7r q-gsistance of 6.00 W. 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 hajaif56i -dp -eve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generat ia6f5-p idej-es 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 tjv 1,2f ah) ;m 8utwgz*tj+vpto a 24-V power supply. The operating current is 1.0 A. Wha1h) 8+v,jjpt;2mwzvtgf*t au t 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 cc 4wac pm ke 3g)7vqo,+p,hw) 8hcf4hhonnected to a 24-V power supply. The operating current is 1.0 A at full speed. 4hf)8vkmcqeh4hc,h +wp oa7cg,)w 3p 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 conn8:99f ds djbugys6tf7 ected to a 24-V power supply. The operating current is 1.0 A at j: gf98ddu7sb69fs ytfull 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 prima cwzr66h9x g*ary 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 fkgdx)xu 2 ( owr)4w66i;rwd1f .edxq A to flow in the secondary. Hiw(xdrwq ddx)xe)wf.46g6 rk 2ou;1 fow many 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 the 2s )n;b c0r9tki.xazy 04-V secondary r0c)bxk.y0ats9; nzi has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cxc /3l ogk*u1q( fdsx3oil. If the current in the secondary is 3.0 Ag(ol3cd s 1f3x*/xqu k, 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. Assu79x 5bk;wskk vming 100% efficiency, how many axkk 79kw5vbs;mps 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 ti nj)7 yy56z mr0ral:neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tlmz) yn 7ar5i06jyr:the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary cxvg m+ia3a84wc bci q9gb: ;5woil and 300 turns on its secondary coil. Ifvw8a4g5cqgim bax3 bwc9:i; + 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 primary coil and 300 turns on )iy+ e o+p6xg)ylfqq3jh, eto 3)w5 stits secondary qowots))3 jph lqy ) 3x+g5 6+feitye,coil. If 120 V at 2.0 A 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 08of u2:k qds6uzm lc4100 turns and its secondary has 200 turns. If the input curr 842 oufd m6zul0cqsk:ent at 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 transformuo20kv2byf . 6f bfa0ter has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of 2 bf2yfaktfvo060u .bthe 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 and its secondary has 200 turnsy29 a4dfzttn,55q * y(/qchpat hz ti9. If the power inputh ayqyzt*t itt ac(5h/4,299 pqz5fdn 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 yi54 s(g9sf hlat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitte g4i9 lyshf(5sd through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current qj (p.ev(kg6i at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in thepv(.j 6( ekiqg 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. Thk:avr ujl n7;(xu2 h),r sp3rbe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissioru72p ;3xl()nr ,akuvjhrb s:n 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 resistan1)7sxu cm wm1cce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformx)s7mccwu m 11er 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 lonyt ir;:5rj.wa 4xz2geg has a total resistance of 0.60 W. A generator producesig2taxr:z 4y. jw 5er; 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the 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 (oap **2g-itit q u/kq1000 V. How much less power would be lost if the power were transmtqk2p*o*(t/i uia-gqitted 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 z,nj; bzklxv *:sm1,b transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transm,z*,:l;bnm vk1j zxs bission 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 -.zhx, k s.cgj)smnx; a current of 5.0 A. How much energy is stored in the coil's magnetic-gc,n hj.;.ssk z) xxm 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 cp8 kdie0:ksbmj0 a5 )yontains a 6.0-W resistor and an 18-H inductor. What is this circuit's time coea j)8kp50d ims:k 0bynstant?

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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 circui)9zvq) 8grz zrt 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 1bff rhl8 9p6.ov) km,t57o ymli7 1jur20-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 resisa* 5uh3 9)nqctudqich5l 9j;utance of the lac q9c5;3u9n uhquid5* )jh talmp?

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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 connecteyix jvm/;f,*n d to a 120-V ac power supply. What is the peak currej* xiv/n;y mf,nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to )1m:w97r(x kz s(pbu9 wofhyga 120-V ac power supply. What is the power dissipated in the resis b(9hx) my7w9ug r:swz1ko(f ptor?

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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 rrsvxgvcr tat v;) hm-a5/q9kjx s0 pa8/c;85 uesistor 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 ae; hivmg08vd tgo)f47x-,m p w 50-W resistor 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 jjagwjnfey0 g-mis:,k6; (h 6lgi + e050-W resistor 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 in mmook yd/*k:.; gsbx/ductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil a r(ro4.uhz91l +ryc8 9,wcz9r9bq acwh m3qpvt 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 reacta;8kuww aqf6j2 nce?

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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 inductive reactance a w-3vyqtjt 73tuk /( emuq(c5vt 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHl 0divu+ /a*:r2 eusglz is applied to:rl2a si*/v eg u+0lud 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 2.5z5ez65(q 4cl-gn zwim0-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive v* x: dxnm/y:9i3ypnbreactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive react*mcxh9s,) a;zqnj vo9 ance 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 12dmz9 kdx*v)lo uo00) w00 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 0rz+ rs s-;o4+m0 zl-dyvrv 4jh.010-mF capacitor be 100 W?drm0-o zj;yr-4vv s +hzrl+4s

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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 any fy,,mn 3ozh:d 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 serivxr :m t6r+ilm ;0il4x,3f;s z9eqypzes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactlvrltf:+,z6 9xx0zi3qpyr m;e si ; 4mance?

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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 coill*5-wcprfeuv ke c cl 35a2a19, and 1.0-mF capuawlec c 19l c5pa* kv5er2-3facitor 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 if a 100-W resistor, 20-mH coil, and 1.6m dnz.,z*ptht b38lw 1acan60-mF capacitor are connected in sln68bzp6azt 13 .,hnawmctd*eries?

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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 ihbxqnaugw4z+w) lozg g9oj 5;6 68pg,3p a8ars the impedaa +w69rx8opbog3 whq)nglz8j,;6ggapa z4 u 5nce 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-- hn(o x3fe.zjmH inductor, what is the phase h3(fjn.ex-o zangle 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 coil and 1.09pu ge a3kry68so7tn :g3uc -y-mF capacitor for a total impedance y6y9gu3-ru7o83akes cn: ptg 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 caphna2 f:;5p nwxu .yo-lacitances is needed in series with a 100-W resistor and 15-mH coil to get a tota:-.n2x; phf5 ywlnoau l impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 45dm1.r8v7 gft o0-mH inductor at 5000 Hz for a total vr8f71 g.dt moimpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resi/w;z wz7.0fcagzx z6 estor at 1.0-MHz for a total impedance ozzz;gw. 0 6c wxza/ef7f 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What 3ha djd1 p)kxw/i4k xk 9oplb/ q9g*2lis the impedance at pb32xk)dwkj9 pl dxiqg4 o1/ ah/k9*l1000 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 needed8 4ut.m xkt((8bgmsxg in series with a 10-mF capacitor at 1.0 kHz for a total impedag4(tb(t8mm s.8u xkgxnce 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-mFw,l )sl:n ,gli capacitor at 1.0 kHz for a phase angl ,ns,wll )i:gle 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 wnwkgw.,vh2+-vn/ptx 4bwiw27b*uh sith a 30-W resistor at 1.0 kHz for a total imp27kb-p4x+nvnhs 2b .w huwv* ww/ig t,edance 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. Wha jnm ovi49sxs:/ /y.ibt is the phassbsnxmj9 ./ : iy/io4ve 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 ykm.f nl+..b9 fn0k mfV and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aref ykbmn .0.ml.k+nff 9 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 resisfim8t /*wlv:d)-rqpjtor, a 10.0-mF capacitor, and a 0.350-H ind*:r p8/il fq-dwtjm)vuctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, ht)wipam( :vl 30in s-and an inductor of inductive reactance 30 W are connected in series to a 110-Vn0vp-3sa:hm i() liwt, 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 Rvj x6hx1qy1 7rLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a r7vx6 hj1qyx1 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle 2ucs:c sp7bvy:n: ;lk of ; cbyl2 uvskn:7p::sc$40^{\circ}$ 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 e2 s6k8m.,r3bq ighgsg 9n4ua mF. At what frequency should the circuit be driven in order to have maximum poweu94ag,k6n23 8mggesh .riq sbr 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 W resistau.9ol/jm0/.a l uex+*pfki mjc7:ttsnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con l+s/x9 fjj: e.ttmm0i c./pok7 lauu*nected 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.p7wj a3ksi5 xqr ul1;y8nb 51dmjv, r AC 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 ur6yhx zwcu94fk3 zr0:w7*xh an impedance of 60 W and a resistance of 30 W. What is the power facthfwh74kru09z 6*x uxrc y3 :wzor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resis6 u fdj.8j4qbic 78kbator, a 10-mF capacitor, and a 0.4u7ib4 8jkfqja .cd 8b65-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 47 8 +urcefonj)*f1vwi wl)dk1.0-mF capacitor and a 15-mH coil in series?clr1f)un+ i4ewjv)7*d 8kofw

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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 bo y9qlp//1 nmmq;*ut,7ysbv in series with a 4.7-mF capacitor for a resonant frequency of n;y7 ,*9bbvtmm/ouq qlyp s/110 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 inductov, t.j t-2ehsonvp *y7r for a resonant frequ-*spv n,y h .7vet2otjency 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 placed in serixaj/)lhjn i)nhcc . (9es with a 30-W resistor and a 40-mH coil if the resonantx ).hjn )c/hj9a icl(n frequency of the circuit is to be 1000 Hz?

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