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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: 匿名未登录  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 o1o o ):fdudw+sf 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 that12wm2ackk z k3 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 c 6gz+vvj1svfjx1 0n-ehange on the inducvne-+1 g f1zsxvv0j6jed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wirf+2 ld, f.8rakog lv4be produces what kind of change on the inbl o24. gf,fv8+rakdlduced $emf$, 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 produc hhzk1*t)f3ay es what kind of change on the induk*13h hyzf )taced $emf$, 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 magxp 5x(p b6gxs9netic 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 induced current in a conductoraqut e8ujt.g:h**7 f h will be that wh8 ufghu*et *qt 7a:hj.ich tends 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 .g4v5r s 2zzsm0pyfrc3h6bh /a horizontal table. A bar magnet is held above its center with its north pole pointing down. The statio sh2fmvz6 gry/bcr 5hp s.4z30nary 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 hu2y2o.h 4)d g; tu1umptdx d2jeld above its center with its north pole pointing down, and released. As it approaches the coil, the falling 2t4h2d gj yxdt1)o;puu2.m udmagnet 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 mx )ir t: bjcz8n.5fp5e(7sn ,m/yqnftagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currm8nnc jr bxsfzetq( )t5 :fi5,.ny/ 7pent 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 region where the magnetic fi .fis)jze7i)p z8e(iteld vector points straight up. The magnetic field suddenly grows stronger. When viewed fzzfee)tip)7i( ji 8 .srom above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thi8jd-igt7 sv3 e magnetic field points straight down. The magnetic field disappears suddenly. Wheni sgv-td37i 8j 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 table7z; vrpk 9r 1oipl/r+e and carries an ever-increasing current northward. Two coils of wire lie flat on the tabl/krvrple9+z7i1 r ;po e, 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 through7.1e hitz3bk u a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fro1kbh.3euzt7 i m 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 abt947e1ifxo mngular speed about an axis whose direction can be varied. In a region where a unifo49ietfm 7 1obxrm 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 about an axib..lij4 xe 9ynw goz; 4/pty;hs 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 rotation if t nw;x9z4t y; lji .h/gob4ep.yhe 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.z2gw/- n* moca
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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 n9b s+v-6ta ig 0b7cuh$emf$ 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 mpv07 y5 ik5yzlagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nort2tv3 dzcc+ 8 g;hf8ciuhward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across th f83ctz iuvd g2ch8;c+e 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 velocity p)r.m cnzzs q w8+ik3+$\omega$ 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 /c1 mtj q+ms9odm)5ta 0qgp5r 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 rotates8+-sae6dnwql q/cv0k 0nofp )v p+m*5xud /xi through 60 revolutions each second. The frequency of the v*k56lqe d f+8im/0/ ox-s+aw0xq)duvp nncp$emf$ 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 u pw (fxb2(xw+zsed 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 devi8 w eqnk47fu,xce 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 d opt8uu 598vpncr1i8contains more loops than the primary coil then itu 8v 8 op1u8n5p9rictd is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops thkl urr7l78b q; 0;fofr3 v u8i*g,zyh-qgua5ean the secondary coil then 7gqbeqvuf z- ;l7,r*ri8f 835uy0r;ulg h o akit 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 pa 2 /z /bqa70;1 kgxpy,fds eqyq/nv,nower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resona;4 a d5y gweh(8g26ggoyqc*jb nt 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 an ideaxs8xzv;tc 9v,l battery of constant terminal voltage. At the moment cc ,tx9z8sxvv; ontact 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 aresf svos)063yi b844 (5n kcncd5mwvpk connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across t5scyin)4fbs4k vcn sp(d m806w3 5kvohe 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 resis c(0atb)or+obas 6wp ,tance 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 induc6z sc05n ynp4qe3 qh3if t:jl;tance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ymq hfg1wel7- zf 55:mseries to a battery. The time constant for the circuit represents the time rz eqmy5gw1-:lhf 7 mf5equired 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 indm ,b, (hpsps v+7hx(xzuctor are connected in series to a battery. The battery is s hsm+, x p(phxz(7vb,suddenly 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 excepf9fvhy5w ozh+. pue)u e0d6w)t:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connecteaz8x36 u dmkle02pth- wha86n d 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 co,-vqy -qqxw6 jfze(/ wnnected to an AC power supply. In this circuit, the currenq(zwq/,xjvw- 6fq-y et

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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 whe4p anfw)9ug br(cp-) *yen3zwn the frequency is trg*byfw(pu)- ar)pwn n394cez ipled?

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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 ac;w+t/ y rjy d;pqjex65ross an inductor is doubled, the inductive r; ypw6j 5xtq/ de;+yrjeactance 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 induce ,t.jqcg:/oltive react:goq j,/clt.eance 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 an AC power supply. In this circuit, 6ryg .i4zhf/ei mm*( hthe curree* y46i/zmr mgh(hi .fnt

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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 cha* z,p* c8orbwqnges by what factor when the frequency is tripled?,b o8*zw*rq pc

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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 a8g 0s 5 v-q4zdsv)gwsi capacitor approaches zero, the capacitive5s ) vgs 0qidw4v8zsg- 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 th/lw :r; ezjv(ie voltages of the inductor and capacitor in a RLC series circuitjlzv(r:/i ;ew ?

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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 circuihqc jv9w q6/ljb4/vfs/w 0 dw*t 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 impeda/we7h(pyeh / jnce of the circuit increases if R increases. When is wh 7/eyep(j/hthis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of 2g+ ;c59a: b duou2 gbnzere9sju w;+tthe 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 seriei*/; -g(dim)0 yuso1 tocam brs circuit. 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 doua5kw1o.)/ r qa nrdlsj;2mdg u24,xccble in an LRC series circuit, the resonant frequency of thdd2smu2gwr ,ql5; aaoc.j1 n r)c/x k4at 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 circuit that is driven by an AC applied voltage. At reso,,wnm9i q;dhonance,

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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 RLCi9:r,0xbmmak5g1xr d circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.l*kjid m( j7x9 4ert ;k/yet7j10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throut9/ 7 47ieje* kyjd;jmrlt( xkgh 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 radius 0.10 me8b /4xaqx 0dn is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o8b4n q0 ed/axxf the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in at6tz n98)m(y2unjn n j uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plan9jzn86j)(n nutt 2myne of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable si)o*)q k./x xmor x.4en juss;pngle 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 fromrgu a 2+f0i mpto78+bxw*,rin $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with0 -2cn rd(nyk/+rg-e h5ofg si sides 18 cm. A uniform magnetic field is applied perpendicular ton2(o+-f k /rghin-g dcey rs05 the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire wit *uju ncv. )jpxu,h2p*m-qgx7h 15 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 1w* *5kkichl* g 2yredg,pq1hand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatiowvtlx rbg.r 9oy1 06)cn where the downward component of the Eart9tb rlgv6 1xroc. )y0wh'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 angulakuj py.j d1;o6r velocity of 2.0 rad; pdouyj. k16j/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 andyy zq9cpw *l:m8cy ),t 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 turnst43 inksu) r k s3e7r4+y8u9byheva3r of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 recta3etdshn8m44w 5 .kqnongular loops on its armature. Each loop is 12 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 m34w5 m8ndsk oteq .h4nagnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns*t;c vojp x(yj)xr *lw-x353 ihquw+n of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 b+ s: h19 wu;npsxt4ela simple AC generator with an output of 12 V maximum when se;l49w subx1h:+tp nrotated 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 generardu(*tuv h 3r9p2;)irbn v r/stor 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 resistance of 6.00 W. The motor operagyw ymm d/+t6op u,5:ptes on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on -j:k +s.uyf.oxg g*wnap 0i;e+ cw5rc120 V AC, and when running at ful i knc+-f s: g0*e.o y.g;wp+u5rwxjacl speed 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 to a 24-V pxd t(zfy gisjb68 *o3.ower supply. The operating current is 1.0 A. What is the start-up current xstz38d*gfbj6 io y(.?

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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 connected to a 24-V power supply.fg s 233dlsvhrih; 7o2tp-xx, The operating current is 1.0 A at full speed. ,x3op-2 7gt;rs3hhix2dl vsfWhat 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 power supply. Ttsc7 qklvi:5: 4cqlc) he operating curretck5 )v4s7ll:cqqc: i nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a p ev+10q+.g 1lbb lo )fk/xajpprimary 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 transf e m38g edh4kk(l t/vmc.n9l8yormer causes 14 A to flow in the secondary. How many turns are in the seconke (dtgcky lhvm38l 9.m/e 84ndary?

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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 y ,sm tl7/gk3bprimary if the 24-V secondary h3mtk g, /lbys7as 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-tu:q/escoj1(lwy dk 4 s+rn primary coil and a 2000-turn secondary coil. If the curs (1d4ljce :/wskyq+orent 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 primmn4)kv y 4u-fb/(aw peary of a transformer. Assuming 100% efficiency, how many amps at 24efbyp m (4)-wnua kv4/ V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon lzxh9ynfk(. me0 )n:d sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whatfk 0l9 ne.(dzxh:n my) 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 c 2jqi.nhb;0s8zw b4rr oil and 300 turns on its secondary coil. If 120 V a84i bw ; rsrj02qzhb.nt 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 6p2 x kv, /vo ou9tzm,1quwpx);0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wh m/wz19tvxo,) 2v,pu;opu qkx at 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 its se 6uq; lk5fv)jqg2k5 w 0e5nnjhcondary has 200 turns. If the input curreqg2)n5 6jl ;u0qfjvwnk 5 keh5nt 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 transformer has 100 turns and its secondary has 200 tklvvgfx6 tdc/ y14 :4uurns. If the input voltage to the primary is 100 V, we can expdl4xu:gt/yvk61c fv 4ect 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 aelm0 ijw4 +f)9az ispke j(f7:nd its secondary has 200 turns. If the power input to the primary is 1(0 z+apee4:fi ikmj7jlf s9w)00 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually sten,lz( t* gv3,mu2.ok rwpbzz*pped up to 4500 V by a transformer and transmittepzno2uvk*z3mrg zb,l,w.(t *d 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 at 120 V. The voltage is usually stejag7*6 x mz21t z /rjevkm5z32cu xe4lpped up to 4500 V by a transf1l x2x4ce7k arjm2gjet zz 5mz6u3 */vormer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppem nrz9h8ln0ao6/0whoi1hn msx; 7k1cd up to 4500srk z olw0i091 h;om/1n 8xmn7nhah6c V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 Weugm nl( v.00w. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linl e00u.gmw vn(e, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener jsfhd: ,ud)4j8 zrw qy.1j9otcy6 2myator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, f 9.m jy)cr8qsy y4,t:h1dw6doj 2zujthe 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 transmittedevuwy1lux : a5b0v)4 c down a 6-W line at 1000 V. How much less power would be lost if the power were l5cu1bvau4we:v0) yx transmitted 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 440xsa fb h wy//s+c,jg-- V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the /b-w/s-,gs ayjx +c fhpower 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 energy is stored i e(my2ex.9bc81ju h gqewe328o:ccmqi+ 9hden the coil's magnetuo( hm x9dw8 eg eqhc.2qc+ey9e jc 2:3bim18eic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is t4ez3ym n(h o2hhis circuit's time constant?y2(nmo3z eh4 h

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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 +xuv4d.tr8ss-7v i eecircuit 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 AC outlet. What is the peak cuf9bkvn)l ;* kurrent?

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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 resistance o -2uj)lzhk2 ma5s9 glkf the lampkajmuzgh) 59 kl-ls22?

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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 pow q9 ,g-o/ezwtoer supply. What is the peak current througt,z e q-o/wo9gh 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 a 120-V ac powe.;mzmzr2vi r 6k .ht;vr supply. What is the power dissipated in the resistorkt.6rrmvz. i;;z2 mvh?

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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,b2 kwp/ fhkk+ resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is mla9hklgj6a/p rc; dy:78h 8g$I = 0.80 \sin (240 t)$. 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-u8m 7 f kqq:9x;dc dlh7nk*hv+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 inductor atmlv/ n wyt*.7 7j/ltbv 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 1000ldpjl 6t 2p2su*rcgmx(, r;5 j.a-zjv 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 o 3,mfbbq.7 pklo0k:t xf 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 necessary for 157 W of inductive reactance at 100+ j sp+1of270ud 0heqnqr1sti0 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 2mm3)j3 2b4-e9 negisl ncl4ja0 kHz is j) j2gels3mnli34e4n9-m b caapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz soiw bu 7d7 omb;vc(z99 si(kfv0urce?

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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 capacitor at 10 g+we(v9g(bgt1c 0,9zceda rxo ..jul 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 /0 gnn -nj)+fat 1 lups,(iecsv m(rv/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-:tgz xxg yva*-g.y,(y mF capacitor have a 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-mF capa,5dss r ddr*e5citor be 100 W?es, d*5r ddsr5

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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 capacitor0zb+ yl3x hgy/bto(n 5 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, 17*e7 e e (bha+7rmzz fb6eoqh.*u()5eejxmc r5.0 W inducti qebreza.) 7e m+7 675hjch rzeb xeo((*eum*fve reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor,km*-9dv 9qq svd4 eu;q kji:.gll z,h)f89xhh 20-mH coil, and 1.0-mF capacitor are connected in serf:qde sqqhll8.*9k 4zm-9 9i gh;jv,kvd)uhxies?

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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 agfbkgz4xa7( k3o+wnu ; b)p 4ut 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c(z+b7owx3 an gku4f) gu p4kb;onnected 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 connecymd q(i7l/me*z y4i:6p(ktjjkvm;) kted in series with a 20-mH inductor, what is the impedance at 1000iyimzm yk( 7v 6)pt:(;l/djj kmqe4* k 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, what is cu-+su : 67dib 6of rhupf2f:wthe phase angle at 1000u :u 6dbo7r-ffp+6uf ih2wcs: 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 seriesads z 8q(6;upd +qq9sr circuit with a 20-mH coil and 1.0-mF capac qadr69 8(;s suzd+pqqitor for a 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 capacitances is needed in series with a o) 0k1 jszr fnfe:mjcj i8c:d0g (-v6h100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hh-:orj16imsk v:f)f g j( j0ecz c0n8dz?

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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 py3u. y uwac l,n8q 4gz;ms4e.wut in series with a 450-mH inductor at 5000 Hz for a total impedance of 4000;483u wae.yzsq wn,.g l4uycm 0 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 be1qddtv.aj .0n put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15 d0a t1d.vq.jn0 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 cc 7d )i mhzx4zzae:u8-apacitor. What is the impedance at)4a-xim h z8zzue7cd: 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 neede d 7qajp4pixrurf4aupy-f) q k7.f4)9d in series with a 10-mF capacitor at 1.0 kHz for a total imp4p7kfy4)qd-f7iq ja. 9r ap)u rf x4upedance 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 for a ph 6uku hvahpw7 3l(*/k.mevb)f ase aa k/ (vphfbuk.hu*)7m3 vlwe6ngle 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 for a 9k yc/ p+kkslr4;3 qwftotal 34;wykql kcr/ 9p fs+kimpedance 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 the phyoj3lvpv2nk+ug 2 5o5ase an gp5nl23ko2jv+yo u v5gle?

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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 1-r s:p5m4 (vfewl j*pn500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are lw(jn4-rsv5 mppf* e: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 consg(5xxb h fharv )gvl2y +; dbvd7ci(44ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is codgrv4x+ v b42cxh;fbh( )5 (7alvyidg nnected 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, and an inductoq/xhi ;p(dsu,r of indu p,q;uhsx /i(dctive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contai1z.lo*5gtwf i449pxpqf u2- oktzp6k ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powero.q izf-k4zpt1p u xfk6plog2w5*9t 4 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 hy/2i)gu *o4xv o*kvdo )uh ygoi*v/2 vdx4*okf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At whasc2u73 eck:w8jc rof (t frequency should the circuit be driven in order to have maximum power transj8wo2k(r:ef cu c7c3sferred 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 15x hx4 e5w avf-f7m:ir 76bwji2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the ci7wv65mffx:5a rh7e - jxbi4iwrcuit 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 ccdpg*ni,drr 6th /i25ircuit 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 of2jl,r5x7x jj 5u 9ftja 30 W. What is the power facto9 f j5xja,txrjj5 u27lr?

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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 a8 .qrnpfx-.ppzsjg78 .8wrcj 50-W resistor, a 10-mF capacitor, and a 0.45-H -p.rx 8 p8fzqcjw.. 7jgspn r8inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seri jp5udwmo (g6 z,un-2fa-3zl xcl-x f3es?lgduz- f nulw-xmca -f23 ,j5z3xo6(p

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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 capa*wpaku /8 uas*ifb4 h2niaw k5 s*d,a;citor for a resonant frequency of 1k piu/*su ;*ah,a kais* bwn84da5w f20 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequx3yx)xpj7l:g l x7j3ypg:)xxency 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 mu +ye6h5u ieptg4af 1eue;+bv7st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of5 e1f 4+ +yut;eei7puh 6aevbg the circuit is to be 1000 Hz?

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