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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 unie9jq3vqn m cs,up-c 7 4um7c+ots 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 ske+j) 1yxrn2i tates 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 change vs(86)z8yzq tlc byv- 7;awgb on the inducedvb8-zvaqlb 7(z6y; )c 8tswyg $emf$, 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 s;jcgb( 1gig )of the magnetic field through a loop of wire produces what kind of cha)jbi1(gc;s ggnge 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 wire produces what kind 51mwp. g./fmu evm9gb of change on the indu15mfemvpbg.m9wg/ . uced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielq tejq e mjnj*s68e(5byp8k* 3d an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current x.w0l5 :utmkubz t6z* in a conductor will be that which tends to produce whz:xut0*z 5um lkt 6b.wich 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 hori;2wjs(k(s4bm w /xpy30 wpc uwzontal table. A bar magnet is held above its center with its north pole pointing down. The stationarycyp/(4x wp2 sm3; bj(0wuks ww 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/bq qkm-v84y iwi( fi. table. A bar magnet is held above its center with its north pole pointing down, and released. As .(k y8iv4qbwfimqi-/ it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poicup rujc)*f 66nts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the u6crc)6p* ujffield 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 region where the magnetic fiepo5f 5 un(;ehbld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current i5h;e bfu5pn(on this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region r d(h6rw3u 3c) 6)kkxepfg7whwhere the magnetic field points straight down. The magnetic field disappea dkwpfrekhrwc3u 6(7h g6)x)3rs 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 ever3)i 4:f(oqn:phwh vwl-increasing current northward. Two coils of wire lie flat on the tablefwh(:3vownq)h :pl4i , 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 thu*fw z0a (-tyb9ojx-;l: e3fzpaey o ,rough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced c- ay9f(ba0-3:woelzye ; o*u, xtjf zpurrent 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 we-k blgzv 5w i6y45s 2l 2.t8rudsk)wat constant angular speed about an axis whose direction can be varied. In a region ww)vds6l 42skw8klur yew5z- g.bt 25ihere a uniform 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 angul vbzn9aj .lf tg-x1dw4b2z j+5tt(9ugar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation9ta+5t jzuzl91n.2-gbxt( jwgfd4b v 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.bui/e r7v8r:38nsllo*hrn)go: bl ; m
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that /q8q wh.4pppl 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 6f) h,/dthsyt a magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in ) av4ol/1ap5 .bccvpnthe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across 5b 1av)4pnv.copc/l athe 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 constanths,)) dl -s07 qwdidoz 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 transformeaf*(pzl )nzpqtud- 3nf ha7 (b3o0(js

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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 freqv 4zbl 5odu7d) u2c3owuency of the lzw2 ddvuu5)47bcoo 3 $emf$ 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 used m ;61 s1k1yf,ib ea.zjg dcv)wto

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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 devi hyr,noy3v5o 1tb(*wo ce 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 coi+ayh8sw /cufvz 85 tq+l contains more loops than the primary coil then it is tu+wa58/z hyfc 8+svqa

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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*zg8)ctba .vqux8 yl 8 the primary coil contains more loops than the secondary coil then x*.y8gcu8a )b qvzl8t 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 i(sw22 k4 a2f0xoemjolnput

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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 eg3)ah sd, nd(circuit,

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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:z ofz3/g e3mp an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosmoe3gp :/zfz3s 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 serwt;14.s mfawgsew o/d oi;j*9 i:whjdc;e *e6ies to an ideal battery of constant terminal voltage.tgs;dem;a9w**id 1i4j hwsew/ .o:j6fo ;cwe 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 resistance R is connected to any2if*4g-qsu,s 5m hkkw* ich7 $emf$. 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 indl9.c7xgcvqp3op *zv t *1sh5cuctance 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 connect14m *tj n*mooped in series to a battery. The time constant for the circuit represents the timm 1jn4*om*ptoe required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batg0r zwb-: rk(mtery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease tomkgrw- r:b0(z

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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 uni1y pyw5or(n vr4h9 nvh.drasn :8l3f1ts 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 to3ch(k;h0e-tsgd c* gz 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 po +rhyz a t6bbqugk14q6-6n8yqwer supply. In this circuit, the currenubnyqqk +68 z4rbg166 ah y-qtt

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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 circu skr :- cbk6k03we-ogwit changes by what factor when the frequency iw: kbswk 3r-gco0k6e-s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across acn d6 lcvyp4ibupi8d s5/j55 3n inductor is doubled, the inductive reactance of3 nics8ujivc /45 ly5dbpd6p5 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 induiyu p i1r6 5/kr)bqszragw+h) ji)o k8hu)p-.ctor approaches zero, the inductive reactan -k) gpj)y)aq1ihhu6/ .sbur5 pw)ir+ r8okz ice 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 to ,ohmah e,p2j7a jd;sp) u*b,ce kv)n 8an AC power supply. In this circuit, the currencsm pv ),ee,8a )jo2hap n bk*;,ju7dht

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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 wha.dmpaa) k+; fkc g:1y7v.jsr gt factor when the frequency is triple1 a.ar gcsg)fkd.ymvk+p :; 7jd?

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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, thel pjci r0tzsm;77*/gxw:im7m capacit*ri cmx j7stmwg/7ipl mz7;:0 ive reactance 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 thnjg m 6tvbu/4 :i7t0ble inductor and capacitor in a RLC stn:0tju bvlgb4m /76ieries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defij uc -xfof9*n8n7kgzb24 dqv1 ned 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. Tse4st 3eg 9vqmsp+rhe +/v9p :he impedance of the circuit increases if R increases. When iere 9/gv39 svh+ ss:qpm +t4eps 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. t9 6jz:4f 7sdew fx(*,vl v1v lehzrk)The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit igb-j0qw z) lms5.j)vq yo9( plncreases 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 circuit46 n c0cnm9qud, the resonant frequec9c4nnu 6 q0mdncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuid 5kaa-ij30+nky;vx m t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs x+d: 8hd u+hu8i0sjpz7 h+ut0*a5/ltw qsioy when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magp/tp6hsjb1co4+ 5p 6lssjg8a netic field of 0.20 T. sp41 bag/ ohpl6j s58stj+c p6 Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of rad)wt.vds ddza 3p5o6;7xld-nu ius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the map d w)d6dvsd xln3.-u7 5zto;agnetic 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 manfa;/h.xbwe7 wp 7e.:szrko 7gnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lob7/wn .w7s 7 :kph;z .farexoeop 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 o,i:i1r80pyx rbja * nqf an adjustable 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 chh;bp(s pwb6orymesm, /al 0.8anges 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 ax.4c,ndztooef(k-v -s; yv1 b square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane o1b- -vy4xesktzf d,on .o;vc(f the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1,;z8k bbn6 uwhplqi);5 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areaqo rt 3e,/xn mf4 h)j.cg.5f7mg(zk wz $0.20 \; m^{2}$ 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 fl zyfq1k43az gu.b8y(dkm 5t9ries horizontally at a location where the downward component of m fdyz8kb 43tkazurq(g1 95 y.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 th /-rrp02 j 1,.a:dyv/en-xweftxhsxx at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axisnx0rxv2 fe/j xd-,yhpwe-trsx1:. / a 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 andb;cmig+q+1b+hcu0;c j iek 9i a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns orc// irnd.s1rf 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 rectangular loops on its armature. Each loop is e;5zp- fh v4ct12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximu-;ze vtfp54ch m output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of os/t; .we0y6 s6 eauzsarea $0.090 \; m^{2}$ 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 qijq: k.0z).s ynfkjpzn +)7aAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.05i)nzqkyj j fk 7q0+.a:)ps.zn0 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 wiyzd)-s6-h 3ruwbx(pmqf ,*zsth a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates o+ g e+2uf9hvvbn $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates onn7 zr3m3thm; uig3-nn,ucz; c 120 V AC, and when running at full speed zi hmu3g n cn-nm3,uc;;zr73t 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 resis4oo1tiryf1 i3n1o is; tance 6.0 W is connected to a 24-V power supply. The operating curiroi 1oyi1f 13 to4s;nrent 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 resistancn0a-tax1.b* ghxmc flx an ) fh5nsf80 6ayk,5e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back xt5y0a hnnxkx0bfmhnfc,1 5lg afa.86*-)sa$emf$ 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 poweymj:fck;10q cr supply. The operating current is 1.0 A at f0y1k:fq jmc;c ull 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 reduc kq2;w b9jz: oy(ql ;5n1xzifue a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secwmopkdtxn ij2 -, bf9c8m60p/ondary. How many turns are in the s8/b0 2-mp6nt wk pjm9fc o,idxecondary?

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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 prjhz5t ta1lf :c0smlnof d+rv ,yb1k)b*8cw/ 5imary if the 24-V second8ckv tzyc*hm, 10+l5 :sdfj15of n lb/trab)wary 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 coi*h -4yazk 3 .1,ipvmzmgrs*gt l and a 2000-turn secondary coil. If the c4,vhk .*r*s z1zm ig 3apyt-mgurrent in the secondary 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. Assumingkbqjl7/fr.k,1; 2b3b fmgl xu 100% efficiency, how many amps at 24 V can flolfbl u;q ,k1.k7gbr2 xbj/3 fmw 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 n/lg3 g*bwilj5v4o 1kl eon sign transformer provides 7500 V at 10.0 mA. The primary co kvlw3l*/ob54gjig 1 lil operates on 120 V. What 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 primary coil and 300 turns on itsfiwspq- s+ dn*()k)vy secondary coil. If 120 V at 2dsks-p i(+q fny*vw )).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 thu.))ob)zwh gurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secbhwgo )hz.))u ondary?

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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 1f,nr h cx7,yv800 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seconcx7rn 8f,yhv ,dary 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 h x h6f:c:1+l13mg: elasnn(dc mk0mwuas 200 turns. If the input voltage to the primary is 100 V, we can emn:m ekcdl 0gcx::s+m6un31hlfa (1 wxpect 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 and its secondary oi11ct2ood 0l9yhdp)9szvonh(z ,q7iy- :iq has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be 9poyv):n7t 9,q il1 o-0 2hdi(soi hzq1dzco y(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 ofxo4 y9hg4j1au current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find9ahg oyx4 j14u 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 at 120 V. The voltage ,d3 9p 5lpnqrw ej0-izis usually stepped up to 4500 V by a transformer and transmitted through a power line of total r ewdlzn5 ipp90rq, 3-jesistance 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 voltag dg-nmlg+hp dp9;94rs/zo )o kf::dwf e 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 linelh) d:nr psf+ k-o; /zo 4fd:w9pmdg9g if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of v9v ,ju z+wlj;0.60 W. A generator produces 100 V at 70 A. In ordz9 j, wljuv+;ver 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 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 w*a qz7crg g93long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ener3z arwggc 97q*gy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much les2;:mw*hm,tj fjo) a jls power would be lost if the power were transmitted at 302)aj:htj f ,mlw* jm;o00 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. 6cjjd s0;gj/ 5gt( njlIt is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0ltd6;j0jsn (c5g/jgj .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 kyw /:c6ig i0ry hu1p35.0 A. How much energy is stored in the coil's magnetic pyyi ch6gwkri 1:3/u0field?

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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 5 1er4l-nidm -as-5jxtcqsk ;resistor and an 18-H inductor. What is this circuit's time conexsmdj -k qt-l -c4sr15in a5;stant?

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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 volt r9mioe4f* u,tage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outle3t*3w ysl r4cot. 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 1(d5i0q; gcgdfmvupp g1/ 7m- 2hkvbvthe resistance of the lamp?bg10ug/-;dph2v(g k mf5qvvic7m d p1

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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 prpw/r2 hk9fu)35fq f rpbuoel-5 m(g*ower supply. What is the peak current through the res p w u(rbfugf5q of-pr)*/5r3mehl k29istor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powenm.- b,d4e4 dyhqopf icp73l-r dissipated i qnpdle3-4fypoh i.47,dbm- c n 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 resisteh*lpgv;z 4 9bor 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 fj(j cuf;73 h 0zifsb/ z7xnj4.w vwk450-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 50;5sq;op)4 nfqig aei06f6y uo-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 induchx rs33b99k yqtor 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 0+vdotxm/ g6;*kzcia reactance 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 u)oh b7p(5omr/ k urp6have 14.0 W of inductive 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 neces - p0;u:q,icmrzk (dcssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 j(q) xnty7.ism.1w pw V AC at a frequency of 20 kHz is ap.mwnw.sqyjti1( x 7p) plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110*mgstj, i9 xu4.syj9 0qcyu+17njegoy b8x 6z-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-mFl m v;ok*wdp;t:c k.2o 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 reactance am4amm vukh5:o . ,hwn5t 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 ax- yj*iaxxtm,aeav9 x* fr6dp-8nj)4 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 0.010 3-x slwhz8e*ll6.t yo-mF capacitor be 100 W?l h-zx8*yto3 s elw6l.

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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 mgfx38q)9b xhthrough 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 w04gyjuiw+r1q+vxtr ylsd )- 7ith 12.0 W resistance, 15.0 W inductive reactancy1 +gys q 4ulvw) ji70tr+-drxe, 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 impnbnvl6t6w iz3+ u(l*hedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arwb6z+* tn6hiv 3lu(nle 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 angr85 zq oljfzfan,.nz1/ i3 zv+le at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa/5in+1qnzaf3 .zrzv ol j 8,fzcitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wha;7 gs z/iqau;ga1p4:p0 slle ot is the impedanc/ a1s;a; :zllepsgg7iu4q 0poe at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor,k6 v2-vo)tz kl what is the pvk) 6oz2tk- vlhase 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 7/ewt 61uyioz a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at ei 6wuyz/ 7ot11500 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 series with glr3mc *oi +)y afc:,ca 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 m 3oflacc+) r*y gc,:iHz?

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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 inductcv7yij s/t*p/ or at 5000 Hz for a total impedance of 400 syi7vt*j/ /cp00 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 br;whhzew) 7.with a 100-kW resistor at 1.0-MHz for a total7 ;w)bewrzh.h 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 withmmd8xq.t 5+d l06syxk a 20-mF capacitor. What is the impedance amq x+6ldk 8.tsmx5 0dyt 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 10-mF capacitor at 1.0 z k ( r(m 2jhr31l/ wowq6mfyi9jh(( :jq4plykkHz for a total impedan wq j(yr9j(yr(hqi m3 lkpzfw4:k(l21 m h/6joce 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-mdf9l t, n8f y(2n0riduF capacitor at 1.0 kHz for a phasnl0(fdy8f2di9,u rt ne angle 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 newef8 o)rbceb :/ng bum; l0n30eded in series with a 30-W resistor at 1.0 kHz for a total imorum; )38w b: 0bnc e0fe/lbngpedance 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 is t8en 7)zunxl*z a 9ruu rp/u.t +ox,.bwhe phase angle?to9xarx purb78u * .u)elw u./nzn +,z

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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, zbws qc9,d mxr(lxi:ffos:c);h 7 66yand 1.0-mF capacitor are conwi zbm rdsyc6xq:lo,(:c)ff697s ;hxnected 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-gq c6z y9zgi3e0(qi 7fW resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powerz37ig0qeg iyfc q6 9z( supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an in1)gsa r6b zyc2ductor of inductive reac cybg1sr62) aztance 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 9rrjia(w;b*u1 n. ovacircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-wrbj;o 1a*va(nu i .9rHz 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 dv67inoy9b;zn /ovd6 ww ;)qg500-W resistor for a phase angle of ob/qdyv)z o76wn 9wv; 6;gnd i$40^{\circ}$ 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 = 10zuwj;wb ;ntv8m.x52o .0 mF. At what frequency should the circuit be driven in order to have maximum power transferred t 8jw n5 vuz2mb;.x;owfrom 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 u82ucike:; gywith 12.0 W resistance, 15.0 W inductive reactance, agek2 ;iy8ucu :nd 10.0 W capacitive 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 jwht0xcmx4 . *g t.j1wAC 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 reowi4 55n(kj la:aqq ab208kmcsistance of 30 W. What is on2aclk q8(5ja04a:5wqikbmthe 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 containing a 0 t8iu0v1p fhhbr2p/d vf5lb6 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to 8v6 vt0udf20 h/ 15plf hipbbra 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 an6lnle dm+3qm5k8ua40 m t9l 0uun vd) 15-mH coil in series?k0mla64)d+uvd3qm8 l u n nn0 ml59uet

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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 ;s 2bv6v6mejma 4.7-mF capacitor for a resonant frequenc6ve 2mbm ;v6sjy 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 seriev c7ml/ e3nvxh7wg:5ds with a 3.7-mH inductor for a resonant frequencghw e:7n /m dx75v3lcvy 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 series with a 30-W resistor av.aoq0*zs3u+0p nq obnd a 40-mH coil if the resonant frequency of the circzpu*0 3a q+vnb os0qo.uit is to be 1000 Hz?

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