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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 followingsbs5 vxt9+3up are units 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 th q0a ;z 3pbocmdwa6asd ,:qo+(at 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 ofrr.p q- 4 4ht *l9x 7iuawk7 dbkfovyj6wp:h** loops of wire in a coil produces what kind of change on the induct4x o-i7h dk*h6lpwwq9r7y f*r ua4k*v .bpj:ed $emf$, 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 wire produces7w*vnmd+a9d a what knv * 9+7dwadamind of 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 wire producerid d( 6ah(x;,3;e;nfsexoxrjqc)6g s what kind of change on the inducia,gfecxn6x;jd);6qds eoh x;3r r ((ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an 1 k6acy4a3e*;fhcrlm $emf$ 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 cucqunns:i 81wi e0l.syh k0:4i rrent in a conductor will be that which tends whu:0qs8l:scn i04 1nii ke.yto 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 tabl6w 7 y3rmsbxo.e. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inx. wrbyos6m73 duces (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 barj hq w7,fsrprgpp1q,q/vw;yj 8se 04, magnet is held above its center with its north pole pointing dowp ep8 sqy,wrj4gvp hs,;/j,r0qw1qf 7n, and released. As 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 rihtaih 5 pma1 oy owj14,-ag,0egion where the magnetic field vector points straight up. The magnetiow phty,ij5mg ,1aoa-0 ih 1a4c 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 tzy6f*o ta 0q*hop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced c 0afhyz*to *6qurrent 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 the ma n1q 92exddore9*z x)ggnetic field points straight down. The magnetic field disappears sudd19r e *2n)dxx qd9eogzenly. 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 carrr:.g o y)bzfo40fs zq+ies an ever-increasing currento bo+ f)0z:ygsqr4f z. northward. 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 loop of wire with the north pole entering fis11m.dh5 w pn)vv wig0rst. As the north pole enters the wire, the induced current wih1. gdip5nms vwv)w10ll be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe)98j+uf wphn :w8c vbted about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be tc+ uvfn9)8pwj w :bt8hhe 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 rotavivkz5d pc-w-;8kbu 0ted at constant angular speed about an axis whose direction can be varied. In a re;vz kd8kvbw- p u50c-igion where 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 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., *1uyf, qlzj :hfs4uz
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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 thae 80;z(f,a3 oj)mocewof+ qibt an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a sw6s9(ykm a3 omagnetic 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 r q6nmu5(4(ejs.c u fu .o6lhpeast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemenu6.uusfq4 o n pclher5j. m6((t concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant alnhz.c*u97+s fgsoh8+ rln8 lngular 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 transfo)8p :ozi5d )-yewgpof rms

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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 revo1)c(0ae/zdxyq j1epl lutions each second. The frequency of the dx c /0zylpa() jqe11e$emf$ 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 used4tar 9 k3n hg8wst 20af(c1qyp 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 deviceo ae)2vso *n t(,y5i-zafc( tg7z7gtv that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more )c f:n+n (bvnsloops than the primary coi vnbn:(c+fs )nl 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 primary coil contains more loo03f ejxc/ gz8c*6l ebdps than the secondary coil then it is*edz03 fg6cxbec/ j8 l 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 k9*n2c hte-owd t ed , gcf8tf;ohw*55input

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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 circuits q ;6 8.wb+uwtf 3-ga6)5yxwbrmssev,

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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 c(pa xwn7.4tnnqe;-t)y cmn6x 9qf6u ionnected in series to an ideal battery of constant terminal voltage. At the moment contac9) ax nyq4pnf.n wiqm6e(6 tt;nu7c -xt 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 battery of constan5r q;yj1,tz(j 7pxaj; //ob heoz*wwnt terminal voltage. At the moment contact is made with the battery, the voltage acrosy( tww q7b,jn;zjop/5 zo ehax j;*/1rs 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 resistauq0to eq0e/ko(.x ;u fnce 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 4xqnc (pyb 4.iresistance 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 stwd 267ka nw 7hfm/co.eries to a battery. The time constant for the circunwf72wad 6tmc /7k.o hit 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 connected in ser4 cq*9))i jt 6lmrzekeies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to dec4jite e)zcql) m9r *6krease 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 samq(.f8fww2 yjqe 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 to an AC power supply. On th7g+t:mz0 af/sc sfk; mis 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, the;4owz-:3e*, db)5v :ouqp lh b gdlz(tcgl ei9 current 59()u4ghezo lo3p -dqb:ibtcd,:;l ewlvgz*

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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 wmk m,y*qzz 9v.hat factor when the frequency is triple *yz ,v9qmmkz.d?

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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 At0y2vxul4ieh ffjqs a*d5*00 C voltage across an inductor is doubled, the inductive reactance * xj04s*l2hfid0vu0tyqf 5ea 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 i7 bizr 06e kwn 0uzqw*4 s0aq:1acssm:nductive reactance 4u0a szn61kr0qss0a7qb miwwze* :c: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. bhc.(t 95m u,nr/grv+vbaq2mIn this circuit, the current(rant2m q/ vm.r, v ugb5b9ch+

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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 ig ohzj ux66n.28qh 4nby what factor when the frequency ihzx 2n8nguq 4 h.o6j6is 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 voltage acrosrldydiudp:i425s/g +s a capacitor approaches zero, the capacitive reactance of that cap iig4l+:dud/r d5syp2acitor

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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 3s )gm mp,yq2ithe voltages of the inductor and capacitor in a m 2 ygmp3sq)i,RLC series 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 cib m u,rxiu21pr1c+l z2rcuit 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 impedancl ,(mgusn: c8+zdxp5n e of the circuit increases if R increases. When is this sug 5+,cdnl8pzx( smn:tatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if/-f h asx u*kr.1l v6tka5*:aw d/kkgf $X_L$ 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 th)t:;jsd 1ue0ys x eu-ne circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seriesdl,-cx7 pf b9lh)ivv5 circuit, the resonant frequency of tha5hif7lx, )-cvpvd9 lb t 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 Ah8 tgm+ghvpv4;n mzl 2+2d,hst- t 8apC 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 circuitv m0 bo/4dtyri i9amh2mz 5-fm *zjfs:; /7jrp 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 0.10 m is rotating in a uniform magnetic fiel)hak p0xx eb+yoi4z(0d of 0.20 T. Find the magnetic flux through the loop when the plane of the loo0+i 4e (y0h)xxbkzapop 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 rotating in a uniform magnetic fir/:to.brbqc- eld of 0.20 T. Find the magnetic flux through the loop when the pl:rc. tqo-bbr/ ane of 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 6jxb7 fms1i -his rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the lbj7s-hi fmx16 oop when the plane 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 single loop is reduc +wwx 18nbq k62t0fynhu9i1foed 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 from ya)qinr)7 9u t$4.0 \times 10^{-5} \; Wb$ 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 r 4;z dp/d ,rju bu5qveity-*5g) .kzgb7 f3xsturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicula5;- 4d v5ups,)xdgz* ri/jt r q.bgyuf37bkezr to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value 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 p x1 .okp+ri;ewith 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 an6 h9ee 8cosbs nf11td.v l8f6md 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 horizo-rb vkkcfx59 a2fm vaa*y)z2:r-v)ci ntally at a location where the downward component of the ya-arvkr xki9)v: c vmaf)5c -2b2z*fEarth'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 tuf n v)a/,ciy; )fu nbj;ie s1;e14fsfhat is 2.0 m long rotates at a constant angular velocity of 2.0 raf;/n,)jfun1ie)acf;s ysb4i e1vf ; u d/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-seys9zd4k, 5 q+xs,ftvw4 mfjf7ctional 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 turnszosw ge/a ;hy cc2w2 gn(qs- -+eq/+tr 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 rectangular loops on -55d2 vr1lkphkb ajfqr4 ea3,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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generatorbk, akrhj1fe p3 l54q -ar5dv2?

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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 1j-eswhiqn1c**ze; az09sa3 ld b x23d 00 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 generatorxu7a 6eq81fisep,( mr with an output of 12 V maximum when rotated at 6a r6i (718,qepu semxf0 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 generator with a mao8,uy wlo so.ot.ltji038cf30a q- e fximum $emf$ 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 moxf /; c44wqw) xjh:9qoihn3c ttor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesfq. rq(m1.ap r on 120 V ACa.p1.qf ( rmqr, and when running at full 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 power suppl,jt qs8s fy9e(y. The operating curresqt j,sfe(y98nt 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 resistasg-1 sfmhup+b i xt/ x4-vy;.vnce 6.0 W is connected to a 24-V power supply. The operating cu1tu/.hipv+fb- gxv4; s y-sxmrrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conneny3uo 5 yj 3lkr 7y4sz+ xn07ksuuy.+icted to a 24-V power supply. The op0+ j ssonyr +uxzyulkn .7y734y35uikerating current 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 i br(1e2g* kkshs needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tra 9u*xl;q3 chdjnsformer causes 14 A to flow in the seconda jldxu 9*hqc;3ry. How 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 24lgsk8)j9:i+ 3 s6ug;a x mhcdx-V secondakjda6xs mgsu8 g;9)hli3c: x +ry 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 500t oq*3wb7::dnbm rz0ot6dm+ l -turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A,*ol :m md+b bd7o6trq3w0t:nz what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiuwu)l x )4(kkyv fts:0(,fha +cgzv;zency, how many amps atkg c( x( yklf0t;vzvzs+ u 4:)a,wh)fu 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provid54lgz/xe n-hi es 7500 V at 10.0 mA. The primary coil o lx4iegznh -/5perates 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 t-jz9 ;fklr in(urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to klif9 ;(-zrnj 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 turnso yoe ;5 3azdks70jjscrpye )d9k ,0d) on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applsj rope)a9 yd)7 ,kdzyco3 kd 5js0;e0ied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconda:dnd3 hnz nv )rj9y)c,ry has 200 turns. If the input current at the primary is 100 A, we can expect the output current at, jd:vn)r)dn3 ycnz 9h 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 ha;1 heao0uyj8as 200 turns. If the input voltagu o810je h;yaae to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu. erb.ao p/7it0hb3 l3orqsd/rns. If the power input to the primary is 100 W, we can expect the power output of the secondo/ihd0lqpet ./ .r3obs3ab r7 ary 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 0ajy0(;gerjncurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prn g0y r;jea0j(imary 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 afk l;.8e, sqfpt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted ;.qfpe,skl 8f 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 z40dml87 : wdot 6rlvz2erv7)i( tp kxof 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. Find the percentage power lost in the transmission line if the voltage:dtprdwov)0rez8 v z77m26lxik4t( l 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 W.;rg v8rwfuy+z2 m tt/kti- dcd oxde(3k ,5g:* 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 transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if ty/td3xi mow25kzd( td8; gv: urf, kec g*+-rthe 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 zqr7593lk uie gu4 df/resistance of 0.60 W. A generator produces 100 u5/l rqgdzk9u4 73 fieV 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 down3m t fs11wh3xj a 6-W line at 1000 V. How much less power would be lost if the power were trant3h3m11 s wfjxsmitted 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 q(:-dx)px; pw t4vqp1wqs h(en9iur sum28q8be transmitted on a line with resistance of 0.60 W. To what voltage must the g 4pvth12-w wq8mudq8p: e(ip ) qxr(xsus 9nq;enerator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of7lma;zx ro4j5b 1ne5q 5.0 A. How much energy is stored in the coil's magnetic fim j 5b1;qlear47xon 5zeld?

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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. Whax /s;vwa-g:y at is this ;vxw:y agas/- circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12-w s6dezo ,4ay0 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 cur0pxfe v(y )en5b sa53lrent?

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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 of the n,f tqsr: 5v*jx 5kg -l;tk/uala*t k t5fs q/xvr,nl5-k;:uajgmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. zrlo76. o0tjq What is the peak current through the resistor6trjl 7q.ooz0?

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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 power disc (nbr:6qvrl7 sipated in thev( n6r b7q:rcl 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 ;v3whn+p*vpk k h60lvresistor 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 as2o.9xpynba 7:htmya* dyckf(7s n /- 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 50-jzt.ze/8: n(jovo 2qr 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(mrsou-m 7t ln *b,x5 4nor9wt 1.0-mH inductor 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 yh*n08e(u ndzcoil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W ofo*x;,iayth6 q 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 inductiv*htnwig 0:v6rv nl- e0e reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency ofzm(7x:9tz dz p)*,j e sb7zkff 20 kHz is applied to iedf)zp 7:fm9jxz,7 s(t z bzk*t?

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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 dqruyls *) +h.xue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7- 49-cj gbfe),pgk ema9mF 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 capacitive6tqj mi3 mzlz v,ax2s/l; 5vb9 reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor hat) ,pitgw1qcff;0w8c ve 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 0.0mbcnre26 rs4za 6n+9w :wypd,10-mF capacitor be 100 W? ednc2,9:yw +w4a 6zmbrn6rsp

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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 and wq-8o-zo7j w-)kgj/s 2qrcd h5.0 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.fn* muo5-f* eyav ):nw*: ohzf(ix5gr0 W resistance, 15.0 W inductive reactance, and 10.0 W c:*f)r5ag veo nuxf nm( zy-5:*hw*of iapacitive 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-vyq3 a30c0pk-zfes /u y e27bqW resistor, 20-mH coil, and 1.0-mF capacitor are connected in seu f/aq20cs3e yev-0bkzy3 7pqries?

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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 150nu,p i9p-c3;44fic3y sqdsr5ta ey-z0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectifeyp 39 ucs 5i -d,3rz4cty4; s-apnqed 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-t5ak ur2xg8z j;zf r;0n9zn0qo7bz u series with a 20-mH inductor, what is the impedance at 8759gxrf;nbzar;0 0n2t z zjquk-uoz 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-mH0hqd +q8k/ gbt inductor, what is the phase angle d+q0bg8 /khqt 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 cd 0eww+nolvd r6v* +c-ircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance ofwwvn +ocevdr-d* + 60l 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 capacita/9et u9el:lhc 3o rzy27jj 2vcenqy0+nces is needed in series with a 100-W resistor and 15-mH coil to get a total impeda h yl/q+vj3 czoe9tjn rey7:0e92cu2lnce 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 450-mH inductoh g0;vu;vn i-h3mwz9qi a3b0 zlr(b) a+o+clhr at 5000 Hz for a total impedance ofbvo ;nu 9czhl+ 3(az0 +ar 0imghiv)q w-l3;bh 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 bew fx1qs*u-d;n put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 sn1qw;x* ud-f 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 itdi2 , 0zf/(3(btkf7mdo nmtgs the impedance at 100gf(3mtt0db,2o nd f7kmz/ ti (0 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 a3no )gi g.jrz5f gy *w-mgik7 vf3(7cg 10-mF capacitor at 1.0 kHz for a total igg-wf iki5vr 3*g7ygg (z jc.3)7fnmompedance 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 phas,p1*l:sjr;hk2 z i s61se vxlne angle oi*sphls 6x1j;n1rlk2z,sv:e f $40^{\circ}$?

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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 1um w8qpc8:u9n :.kuvf.0 kHz for a total impedance of 45 Wnp8uq.vk u:c:wufm89 ?

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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 100s; d57g..t:hrz yt ndz-mF capacitor at 120 Hz. What is the phas:yn75d .s. t;rtdgzz he 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 V and 1500 Hz if a 100-W res6po qla0gg7/ zistor, 20-mH coil, and 1.0-mF capacitor are conneo0gpl7 qg za/6cted 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 2ld)befsd iau pd3z:y7p ;2:h-W resistor, a 10.0-mF capacitor, and a 0.35z )fd :p3 upy2:ba7ld i;de2sh0-H inductor. 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 ree popj+.ohz(+- lsuo4actance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 11soe .+o4(h+ u-zljpop0-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 ci1y.5gig+w ,x ejmfsvg48de u-rcuit containing a 50-W resistor, a 10-mF capacitor, and4v8ugg,.5igme+- fy wjse1d x a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resip-lj ) vjd26smxm;p:wstor for a phase angle of jml;) xpsw 6jmdv2p:- $40^{\circ}$ 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 mdk*05rzhz -gb/)gu7 svhhse 3 F. At what frequency should the circuit be driven in order to have hd35z h gub*7hvs/sgz)ek0r - maximum power 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,a/(d w r5t7cu 8v0 dvuyhyk,r W resistance, 15.0 W inductivyt/ vcr a,yr( 8v07dwuu5k,hde reactance, and 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 AC circuit icy 6ieut f1h2a;zbq ;+s $63^{\circ}$. 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 imp;qvv:9j*p5dx ia x k8oedance of 60 W and a resistance of 30 W. What is the power f5 xkpq9vo;:jiv* d8ax actor?

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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 fora65,-ni)t o;bk8stj eqr 0ed z a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectkntst5,i0oz8 -bjre6 d) qea;ed 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 nhp0h 9-csvq,6q0+l)wg vrvxseries? ,0sl n0qp9gqhr6+vvhcw x) -v

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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*kwv8u4:ipjja ,rw: hqd 2 i*q in series with a 4.7-mF capacitor for a resonant frequency of 10 k:w:*2jwdk4h q qiurj,pv8i * aHz?

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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 seri. ar fm3it.p8bes with a 3.7-mH inductor for a resonant frequency of 10 ibtf.8r 3pam.00 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 f (7t8-jri f3no4vd)o ngmj(tj6n xa4 and a 40-mH coil if the resonant frequency of the cirfa nt(fdimrn x - g34j)jnj6t(8o74vocuit is to be 1000 Hz?

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