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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 of magb-8+ahzt e9ainetic 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 inducta)fs+w uv;4jjj*m 2ha *cxp.vion states 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 produccuo;88f,, qm:bh cai3gjz dv3es what kind of change on theqzc obj, :3dg fham8c;8ui3,v induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whv2cw 0xaz f-(ol (;qe:wbn; skat kind of change on the(:2fck0-v ; ;wwb xnq ozalse( 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 wd )w qmvs :rbwfol)ua12499vw ire produces what kind of change on the inducawl 91uqvmfdw92r)b4)wos v: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 n3c,tmlrs)vz c a9qr9f*)t0van $emf$ 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,76 ttbs tx64m dsh,6o1bspsh8*doj6r the direction of an induced current in a conductor will be that which tends to produce which of the f7ht61 srj, 6s6 db o8m46 xhpodtst*sbollowing 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 ho op /k3/po1.fq v5/j 1voxwbjkrizontal table. A bar magnet is held above its center with its northj fqvkopk35./1v 1/ /bjoopwx pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i2jp qgpii9b p, u4(*xsejgt(fga(4 l8ts center with its north pole pointing down, and released. As it approaches the coil, the falling magneg(s9l (i(gppipxjeb4 g*,4t 8q fa 2jut 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 a5x3eu( 2p.oeyt l fd9the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades ad9 (uoyetf 3x2.5lep?

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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 tablzky j -8.0pbaee top in a region where the magnetic field vector z-j.pyek0a 8 bpoints straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the mv. o (k6riy5cgagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directionri5 ock(yv.g6 of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing kfnt68g5 ao92c w+c hu-ko)yq current northward. Two2g uy86w9ocaq5)k nch f+k-ot 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 fir*v h7u)lv 6qlnst. As the north pole enters the wire, the induced current will be (as viewed fromnvqu7vl6* h)l 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 speed about an r4 9qx5ae)lfq(6vdye;+gy:y l vt9nzaxis whose direction can be varied. In a regivtydl 9e4g+ 95yaexq zlnq;)6vr (f:y on 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 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 axis whovw/y+kak5 fdm.z6h f5se direction can be varied.6hkv/5mkf.fdywz+5 a In a region 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.m js26 lrh;fi;
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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 (; ujt :zgu2ign*m0vb3vvg ri..t 4vjthat 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 magnetic field. Thef)r 07u au;vhn $emf$ 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 dirb;b6*pc7iki r ection) is moved northward at constant velocity through a magnetic field that points straight down. Make a sta*k pii7;b rcb6tement 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 angularb6o hr3c xm2vdg)w 8 mb,5sk5j 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 trans9wzr(mo:enf4n/ / k qeforms

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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. ;scn/z*qpyf c8 phnwgpx) /: 5The frequency of thygchn p:wn sq/ 8c*)5/;f xzppe $emf$ 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 devixg pon6h/32 dc :hkd5fce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de8 l2k32eejkgcm:*sgagj+fh . vice 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 seconkroj m: a7 991od09nucn bwxk;dary coil contains more loops than the primary coil then it is a un9cawm on1;d09xkrj 7b: 9ok

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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 thif(xoss1 -i -pdik,:x*8 lvxian the secondary coil oxvk:x*isf- iix,1i ls8(pd- then 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 po,8jkzeuz6z)9 e/bst d wer 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 resonant cia. (9;8 frjc pmogxi9arcuit,

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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 indufie9 o9 t1yg6 ulg0pc+ctor are connected in series to an ideal battery of constan9e9cgio+ t gypu06fl1 t terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seri g4cc )/qiz;v7ofe u1zes to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the induczci gue47v)cfoq; z/1tor 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+csy+tja( o5j:b3r xi is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected cjvp( 9lszv 5d7we,)0 b ;oo*ijxlda +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 series to a batt a uo2h)zn):)1ipbgjsery. The time constant for the circuit represents the time requirednb1)ishu)z) 2o gp ja: 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 batteryo;byjv,02bp bk3 mw ks6)/kyd . The battery is su3 0 m/bbpy;k, ksy)jdv6bok2w ddenly 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 tbdycm3 c,n 5 mcopzt6e)qi91 3he same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supplmt3s 5tzqmy4lv39 vx3 y. 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 connfshb iunx8 3we35he i+se6) 5fy9st8nected to an AC power supply. In this circuit, the current+5 h6ynsf)fwnie3x859 tb8i eeush 3s

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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 ci7v yhk, /iyhfw vpsf5kh*(c/ 5rcuit changes by what factor when the frequency is tripled*5f5v( wfhyky/ kivh ph,/sc 7?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductive 4 93xtwi fhs-u-g fue*reactance of that4e-*9 s-fuuh3 tixfwg 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, thud(cj3o;vvqq* x q17e e inductive rq3xq* 71q vu(;jdeco veactance 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 g1mc5xn2 vjm6 AC power supply. In this circuit, the currentxjc5nv6 1mg m2

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what fab4ph f0 52dt wqdw/c:m3a3me8hn ed:f ctor when the frequency is triplefhb3q h: d dm20amcwp wde584t/e:nf3d?

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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 cap fdin0v ocea./7p-;maacitor approaches zero, the capacitive reactance of t0- iav a.f;epo/7mnc dhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induct2nqs 0ex oq) ,d-u 1hbhsi9m:uor and capacitor in a RLC 1bh)us0ex 9qmu-, s 2hin:oqd 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 cirdos)jyr.k(ej qs3fit9) *./ld e ex8qcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ir+:fhi8z 892, pvy tvfx bsm;yncreases if R increases. When is this statem,8hm tpfy iv;2z+vrxf:b8 9syent true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cir ;:m(kq b nsr2svo(yx7cuit 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 5o qibexnv 42hsm--r*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 -tuh yhy3cow8n,;ql:both double in an LRC series circuit, the resonant n8 h;yut:wh3o, q cy-lfrequency 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 circuit thagblcmf:hd847u3 sz 2ct 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 circu-v6*(0t r*lqs ghmf vzit 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 field of 0.(s wqhj-jk-f y- ea81x20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector yf xajhweqk1 s8-(-j- 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 8z(qamjwg ( .)yi1o2ml q8uocfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec(cmwqq 8l u8omo 2y)j1( az.igtor 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 magx 6w (nx1kpq6qmxkf(7netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar 6 xmq6xk(kw71n xpqf(e 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 si6qjd k8x1:wsxq ift.l;ms 7g f7) iw8gngle 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 fckgk p z3pv2f :r(t1adkt34-, rq 8ojqrom $4.0 \times 10^{-5} \; Wb$ 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 200y7mw i y9z*v -j5u7jn t5xejq3 turns of wire on a square frame with sides 18 cm. A uniform mjnqj yj5u 7vw itxm9 y-z57e*3agnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value 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 (vk,cu,mge0m dw6; ps+-ts h b15 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 ar6h4c o(r tkz5mg19: ,kxccytiea $0.20 \; m^{2}$ 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 locaqo d;:x.bi )zqtion where the downward component of the Earth's magnetic fod :q; .q)ixzbield 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 ba d9oe, (ywou dm4kn+6s)s nz5yr that is 2.0 m long rotates at a constant angular velocity of 2.0 ram 4)ody5 69zsw n+,o(ky dnseud/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of7g9d ggze cibn wgr2a ./ fw2do-qz*:2 $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire 1 jfzp amn p-5ya7a7(sof 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 l*6nu y)ypz6 mi;:qiqi;dxe1:yds k j +oop 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; *j:e+x:yzduy6k;m yipsq iq6 d1in) 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 tfny)5 kedlq+/urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 Vbohn3 uqs2bz29hqw6/ maximum when rotated at 60 Hz. A magnetic field of 0.050qzhowh6b /qn 93u2s2b 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 maximum jv x mvi *s9jhm4yc98x5:r .ul$emf$ 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 od v6mf.wl* i8operates 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 re6s5vsi m.3ue ksistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a 5ksums3v6i.e 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 su3xx+;pg-wh,ov, k u we2i 3tg9 q xdos.q8mv.opply. The operating current is 1.0 A. What is the start-up cux;3.so,pg w ,ogx h +vqqi-38k2e o9vduwxtm.rrent?

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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;er8)w svyn2g.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speeregn; w2ysv8)d. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vv4t avni-f;n/ power supply. The operating current is 1.0 A at full speed. What is ; anvinf-/4t vthe 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 needezu bivl0pg-k3 . -cg;sd 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 transformerr56 pmbbxwjgkb(ps 2 j+y+c+5foe60r causes 14 A to flow in the secondary. How+ +o krpyr b6 m6jxpsb5 gw+5c(e02jbf 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 ai sil)lob4befz+66 x0 110-V primary if the 24-V secondary has 100 turno4+ i6be6)filzlb s0 xs?

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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 nbr8;z lu0n0+6u-hw-qy fpxq-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary0xnw0u-nu+yfb-qlz 8p6 q r;h?

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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. Assul d v+7/fzaxz)ming 100% efficiency, ho v/7)zaz+fd xlw many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tr))cstuy2bkvd15i 8 + nh/rduransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drd k)5n8/dr tryu+cu 2hsvbi)1 aw?

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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 o3 ah g+6 a+ mi3ov9afp2vpt+iturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondam2 p6o3ga+h 9++ ftvoiaaip3v ry?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on it)0nox4;x)ox .ammd rus secondary coil. If 120 V at 2.0 A is applied to the primary, what current ix)oa;.munxdo4r m 0)x s 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 /oq wtyyeqo3+ ret,05 and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the, 5/ee+yy3oottq q wr0 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 secondfjb57mm co g7+ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bejm 7o7gmf 5cb+

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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 andn9 -hr iwh3p hof)(q-u its secondary has 200 turns. If the power input to the primary is 100 W, wh q)fhhno w--upi93r(e 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 Vvh.*vib.fyn:r8t0n bzx u.x7 . The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resis y:v.708hxu..b zft vrx*nbnitance 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 usuab4s2hi1 xzpo 2yhh*) uho 4qw,lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find tbs2 ihqxh*1ow)z h4hu y4op2,he 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 vex5i6qkcsf7 m9+m)i current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a po76mc5+9i)ke fx mvsqi wer 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 o i))iznlac.:rerl p. :anen2/ f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up withi :ralecan2 re.np:) .nzi)l / 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 9hy;izvx .987ipfzm rn++zk j0.60 W. A generator produces 100 V at 70 A. In order to rx9m7 yr8fz+ i+9p;kz . nvzijheduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be lcc4m2x h :oeiih5pq 3(ost if the power were transmittcxo5ip4mh3h q c(i2:eed 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 20qegkrz3i90r owx6()r 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 power loss in transmission is not to exceedo) zxwr r(rg 9kei60q3 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 st( :s-ayqrrr3 tored in the coil's magnetic f :r3t-s(rraqyield?

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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 t/ulg9ls 6e 6iz9 d imi4r4jeg8his circuit's time constant?eze/gri9lj864dg 9 limiu64s

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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 circu7 5sy9 hwk,q1h bt()ijwqcm+jit 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.vf4 +s42z8xq rewp wh. 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 12nzkol3u;mum 4v8r.f)2zdc 2 s0-V AC outlet. What is the resistance of the lamp2mmr)4uzsc.2n8; o3z v k udfl?

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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 connecteg qit)zi/ge3 1rr8l 45c3yi ure ;oa*hd to a 120-V ac power supply. What is the peak current through the resisizugr1qitc h/e3i8olr e5y3;agr )4* tor?

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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 t05sgcm9 pf +edissipated in thmg09t +f5cep se 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 :0q9v ,ulyssu 50-W 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 ehnmf+liq)jqrv/ 8s:qb/z 4: -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-W resistor u-q4+ oyy- dgeis $I = 0.80 \sin (240 t)$. 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-mHmskf l47yj- j* 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 reacujx7bst74w6rud f r,f)w:0r mtance 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 have 14.0sv -lm,6c- a3f f 2qppofb3/va 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 necessary for 157 W off.7h qjwe( j rbad( 1yb+jm48 kcn2vn/ inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequ1kftty s9cm bid 8r*,; equy,/ency of 20 kHz is applied to ityc9*rt8,qyt/ksf;1 eu i b, dm?

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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 chk/fl1e47 fb, f s*hveic01db oil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 m 0smp6y3pezz- s m.4qn9c( dfkHz?

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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 at 10 kH w5+jaxzzdnbc3+88zs z?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doese;79ze q-hugk 0mg)8l1 .lbae h)vsvo a 10-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 ccjh3c)*dvvi ;apacitor be 100 Wv3;h cvi*) jcd?

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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 agt9sl/- f +-q)g bznby 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 impedancv,1j9+cale1x3yj i zre of an ac series circuit with 12.0 W resistance, 15.0 W indj 3al1civej+r9y,1 x zuctive 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, 20-mH coil, and kma/w5(8txf p se ;yd21.0-mFd5sfpk8 ; (xaewy/mt2 capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and /e cx0iy .nmcv f.nomknj)1688beqk) 1.0-mF capacitor are connected in seriekx qn e b1yimj8co8mk6n/ )cf.0e.v)n s?

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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 eg*v w;wl x 02yccrm+w )z7n/.hcq1rl-mH inductor, what is the impe+gclwvwl/z;qxr1 w7 r2cn0m*hc .) y edance 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 conne *4tykjz3 ee8rcted in series with a 20-mH inductor, what is the phase angle 4tej3 k *r8zyeat 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 circuiu:wt(1qu x8git with a 20-mH coil and 1.0-mF capaci(8i1:u xtgqwutor 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 iz9wv4q*bf9h.l8x.n8o h d z zseries with a 100-W resistor and 15-mH coil to get a total wbz9xhq f. nd o88h*lz4v .9ziimpedance 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 inductor at 5000 Hz for ae 08t 6 tvru /2(suobuvzj.8yo total impedance o/jo ( 6ot8028eub.u vzy rsutvf 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for fy+)ibqkd+4 w ,k-x qma total impedance of 150 kW?yx)k,+mb wifk4+d qq-

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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 seri)25mxr5m3 tklvm)f + pvyxy :wes with a 20-mF capacitor. What is the impedanyxpxwm+fmr k2): y3 vtvml5)5 ce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz f g3yvma.uqy /avxj12,zo 1bi9 or a total impedani9, .a/j3 yqxo1m1u azy2gvb vce 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 needed1lh/us 3z8dg s in series with a 10-mF capacitor at 1.0 kHz for a phase angle sugs /dhl138zof $40^{\circ}$?

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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 fozws1 tc :u7uf1r a total t1zs:1u7wfc uimpedance 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 1dt qkltu43 ;:u00-mF capacitor at 120 Hz. What is the phase aq u3tu;d4l :ktngle?

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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 0iueesho.*t4-mH coil, and 1.0-mF capacitor are connected in serie 0uei oh*s4.tes?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W 25v eqrp-1y s bursgf7bw(s2. resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz ss7w(ye u1f2 s.5pvbq -r2brgpower 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 capkz2jvv -i3 d.sacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series t 2.k-i vvd3sjzo 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 containing a 50-W 8 tldc1e8b8giw(phwjk, u(e 6 resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplywtj b (wk dee88cp6,8(1u hlig?

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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 sw:xdy-/cb;ah eries with a 500-W resistor for a phase angle ofhx :- w/b;adyc $40^{\circ}$ 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 what freewj7)tb1e h7h7 pr n,bquency should the circuit bewp b7jebenr)h ,ht177 driven in order to have 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 i28eo r+bdq6mn-hu g1sn an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wh 82e+ugsbm-o hd61qrnen 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 n h( d-*lr i4x+g3wmh8+mivgncu1g 4lcircuit 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 t : vyp s8;/grz+ytcg,resistance of 30 W. What is the t/st, cz 8ygygp:+;vr 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 50-Wo 5nx-pxhr5p of9-nu ri-d, )b resistor, a 10-mF capacitor, and a 0.45-H pdfr9) 5 ob5u,onnrxxip--h- inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a fmr9s x f7en7gn4m;3r1.0-mF capacitor and a 15-mH coil in series?er;4 7ng f3fsm r9x7nm

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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 sdc : q 3bq:erwfd4e**aeries with a 4.7-mF capacitor for a resonant frequency of 10 k*3 rf4 ae:e*c:qqbdd wHz?

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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 9axni*n: z2sj9vz(cdseries with a 3.7-mH inductor for a resonant frequency of 100cai*nz9zdns(vj x92: 0 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 avb)nmft( *z8z 30-W resistor and a 40-mH coil f(vzzb8nm t *)if the resonant frequency of the circuit is to be 1000 Hz?

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