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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 5cgni ,f n.4psli*cc,)c/xx ml q:ro0of 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 that thcp 75x-xh 2c8kfs) hg.(mcutie $emf$ 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 (v,c(e;ow 9 g wfi.amtin a coil produces what kind of change on the .fwoimeg9tv (,cwa;(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 masijrc:o:e49 l(1 hupmcyzt/2gnetic field through a loop of wire produces what kind of change on the induced ylc:s42u1h (:zm t/cjoper9i $emf$, 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 prod8hgu6+ ,d tneauces what kind of change on the inducedad et86u+g ,hn $emf$, 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 8 uk76-i zy vo2si/nbo$emf$ 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 conductor wia:.raj61m8/pyh4or-tg eon v ll be that which tends to produce which of the fo :g4.-hn/em1 rorjt a6aoyv8pllowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itwz mm y,bl wf,hdt-i6h*0ml,8 zpu.e/s center with its north pole pointing down. Th/8zdm0m mt6lu-zh yl pf,w,, e*b ihw.e 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. Avuu r79.;cg5ctrch .b bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling ma t 59cc;cv7rrb. ug.hugnet 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 k*n v a78+j harfy+ig/region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induagv afh+i8+*/y7k rn jced 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 lewv(b-v z7fkh b6f; 77nswvu7 tvel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is n zbfvu7bw7k6s(v v7-;f7thwthe 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 mag*2- keokj)pg:j 3 syx,e )5cp)jjy.rh3ketqo netic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced c.yg ct2 *pe)yj)5j-o:33 oekkk)sxrpj j , qehurrent 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 an ubzrr5/7r0-:e c ckf,hbl0qrd carries an ever-increasing current northward. Two coils of wire lier c00 lr-h7/uzqebrf5:kc, r b 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 th4djs *dcwls 4m,g w 4csux2f,2e north pole entering first. As the north pole enters the wire, the induced current will bec22dgsmx44f, ss, w*duclw 4j (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 speed about an axis k+ss y,7m tc-iwhose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the tys- c7si+m ,kloop'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 c 65yc. wh 3jiaeadsl4/ 4gx,owonstant angular speed about an axis whose direction can be w3g5e l.s6i ,c4/ h4ydaxo wjavaried. 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.z;lfc bs 96-r40dqy)qz st:wz
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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 thatta86/7oih.yqk jk y *u 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 e;iml ;*sm hr -lkutb xn,w5mkt,/7f, a magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved cjc(ad8 2mdi:northward at constant velocity through a magnetic field that points straight dowdj8ca cid(m 2:n. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity nwxn +hp6m bjz 0ghf0+c3-4gtjxa; e/ $\omega$ 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 transaut) u x+0vh+ek8;8 jodrbcb9forms

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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. Themil4rk1jy /+ x frequency of thlmjx 1k4i/r+ye $emf$ 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 uslq,ncg vwc;ox;n ;.axz17 ug,ed 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 device d f*u bu h1 teqou2pjc,/1jp0+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 loops than the primary tj n da2iu:jhm-6lh+mor e *8*z /x;blhd.u0ncoil then itnea x8i lh -*+tb.mu/du*d0:hz o 6lh2n;jrjm 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 than th 6voptvf6:( ize secondary coil thenfi(6oz6p:v t v it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power )pc2; s-wrx 4 iq*pdfvinput

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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 circe q rou7rn;s.;ko1gq 9uit,

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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 ani..n1yb.f,uq(lup a r ideal battery of constant te,fal(uyn qpb .ru..1irminal 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 y tmzw /uns4)9/ inzh-in series to an ideal battery of constant terminal vht/4sw)u/z ni m y-n9zoltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R 4 xhe;s5f::oy o;8dkwoljai* 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 wi: gxkf:k(ja 9 fby25rgth inductance 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 skav rbs a0c0(1eries to a battery. The time const0kvabs1 ac(0 rant for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductjdvzx qpk(6(ky uwosr. s ++e/rr,u8 /or are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repres+zk (p qds8/jve /wkxsryr(uou.+6,rents 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 8aae-((qqsf35 5m re g jets:sunits 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 thr. 5pw/rk( uxox q.xq/is 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 c-6*p 2 d-3y4f fygs/z7noxfa6kks ggkonnected to an AC power supply. In this circuit, the currenfy6*ff ano-p x /-2gk37kzgy4sgkd 6st

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance ingl(134l3 lme,xdgv v; to*lfw an ac circuit changes by what factor when the frequency ivlglxew d3t ,3( vog4fl* ;lm1s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, tvfs-7gm2 cj h,he inductive reactance of that inductg7v-mhfj , s2cor

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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 indudy.r4 qtfwc/u41x*aqr cb6.u ctor approaches zero, the inductive reactance of thbf x q6q*c4.t/y uu d41r.arwcat 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, the -o4 n2)wq q nncv-jsu,90wsg9 o0hgeucurrentuov9 2s-,n9u 00j)qgg wh4q wocsen- n

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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 a0pum3 lm0imp)ooi p (:n ac circuit changes by what factor when the frequency is triple up 0(03pi lm):oipmomd?

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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 capacw t*3 e pgpw)snu)(e b4nh.ob8itor approaches zero, the capacitive reactance of that capacit.s*nu48)nebth3e(pw)o pg bwor

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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 ang*4x ddkxf- div(ew8)l le between the voltages of the inductor and capacitor in a RLC 8 d*)dxike-(f4d wxvlseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined fjtg,5n0 +dah+h6 g ecas $\cos M = R/Z$, 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 increases if R increatzcn+m; f(u.w w1p9gsses. When is this stgw w ;ns cm.p1(t9u+zfatement 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. 6ekk)/8ojn (o ofn)kg The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of thbik*fu-g.hctnx;o :2e 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 series circuit, the . vumy7 qs)rt6n rj)(itiaq-*resonanm.q iyjiqv(ut-7)r)atrs6 n* t frequency 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 circud7g0m mo7zny(z3wztuc0u9p6 it that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series 453/n yscgmqkexls ,9RLC 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 0.10 m is rotating in a uniform magnetic f-zwhz+kds; 5fmq, q:xield of 0.20 T. Find the magnetic flux through thwkq+5h,s -;zxdfz q :me 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 m is rotating in a n,/g8jvchx56 (4xcgj* a. o7bnu lam luniform magnetic field of 0.20 T. Find the magnetic flux through vg 4 c7u*,/5nx(aaljxo6ngb . ch jml8the loop when the plane 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 is rotating in a uniform magneticg*orc*w;r;0u5 8 th8lqvg jgq field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of go*v8 c5rlg;q*8gt0r;qhj w u$30^{\circ}$.

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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 adjustab6 rr;qg6ki1 xo0 jlk(ile single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cha:s objq4: yh *-qtrg)hnges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire wjt )r n3o9xzy2gu9 e4hz7uo( on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fromg4j n7(zxu9ot2 9)3weh zuyor 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 15 turns and an k0 ;na1y6,jsxv n cte7area 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 arf*+l6plaz+ r1ksb /jeea $0.20 \; m^{2}$ 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 6f1qg c;*gvt4) xz9 hjz0 m flies horizontally at a location where the downward component of thgqg 4)vc1; zjtx fz9h*e Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long .m18/bb d 8dfktr yim.rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throug1md bm.kb./tyrfd 8i8h 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 anumvk 2 gs)y1s*meq,d2d 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 consistse 8kv)c ed;s:w:p 1vvv of 100 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 $emf$.

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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 loo4ydv1s, pwr 4 :cc:qz4bz(+u6dpui knps 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 ronk6 +iupb4wrz:,(ds: 4zvpqc1 u ycd4tates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area e9xnoo e63i w(fnz5 5u$0.090 \; m^{2}$ 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 c9j.f)zifylz+ d :zw f7onstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating cow.j: fizd)z 7+f9lz yfil 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 tnudp0g,cuod m5w998jeo :* emaximum $emf$ 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 havebk bh2s k7 5q1xxo5rggb 2)hy) a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates onr,euipm )(svn ico *48 120 V AC, and when running at full speed it generates a iiep)r *m8vc(onu,4s 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 resistancc8v u-:2j cj2,c.z )sayw yaj 0y2klsge 6.0 W is connected to a 24-V power supply. The operating cu a,c. sls: ) c2-c2wzvky8jg2jayyju0 rrent 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 resistance 6.0 W is connected to a 24-V power supply. Thau41 ex -ef2m bhto/)xe operating current is 1.0 xmt1 2u hb4/eexaf)-oA 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 cod-dyb * gqp89i+ qo.bdnnected to a 24-V power supply. The operating q bgo8+9y d*b iq.pdd-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 is needed t r3hg8k vt/;t:yk 8inco 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-turnuyareci;n* b62z5 k/ q primary of a transformer causes 14 A to flow in the seconda;2u*5ir6 y nzae/bq ckry. 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 11 9o o93jsd ;sqcki3;z+6hqvse0-V primary if the 24-V secondary has 100 turns9vo hqe+ 9s3cqkjsoi3d6;s z;?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn t4guaemd-v 64 fk(/vn primary coil and a 2000-turn secondary coil. If t(fgv4em a6d/ t4v kn-uhe current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. A*c3nm pk2 t(hhssuming 100% efficiency, how many amps at 24 V can pctm(32k h*nh 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 neonzl+ +twpj r 95-k4;yz4 yljomh sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. oy++j-l;h9 z 4zy4plm5tkw rj What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns o:jel7w8gts n: n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tsl7ew jtg:n: 8o the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil abs/+fz od(g-g -ttuo k n.a,2ynd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?os2y kgot. fbz-,- d+aun( t/g

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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/:4ofeawo7md 4pgqm8du g u..ry has 200 turns. If the input current at the primary is 100 A, we can expect the output curregdgpa 84 umfemud:q.w7o4o./nt 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 3pa4.z6(u6+rvv5u d wpz wuhmits secondary has 200 turns. If the input voltage to the primary is 100r6+ pu(6 mvwz.wz udv4u3hap5 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 tra w1j.a*x zizz.nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can.zz w.x 1*zaij 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 ab7a9fx ys4i7pp5o* opt 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. o9ypx* i5psp74f7a bo 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 stepp bvy8:dn7n 15mha u-c9wxt:ygy6 jd,v ed 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 transmissm t1 9db:nw 6:,hvy-7adcuyv85ynjx gion 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 step k6:tk:zq9w/+s ucpzv 4j;auw ped up to 4500 V by a transformer and transmitted through a power line of total resistance 1:4k+kz9;uww a6s:/pcjtuvz q .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 off)lri-2 y p :b1*sk *rf: flcw1o*jpaq 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy wbf1ralf*p )jq wf -2skoc:li**1y: rpould 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 linetpxp+i3093tdd8rk * t1kppjt 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns r pt3k9id j3*pdp 0tpk1t+tx8ratio 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,pobpo nop .,vj7,.ks V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V. ojp,bsnpopk,ov. 7, ?

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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 ibwwqm4j+ d110l -hbhe s 440 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 power loss in transmisslbbw -j0h1qhe4mw d+ 1ion 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 *j229n; resuo*n8ku hobcro ix63g* jmuch energy is stored in the coil's magnetiejkn r*oox82* js6hru;9 2 i*ob3 guncc 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-Hdvp dq*mep q1 t9ci/ n()jj*p mh;.zm, inductor. What is this circuqznp(dd tm,ve)*pm jm*jc 9;p/ hi1q .it'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 y fi;0q.or65r xx*oz uvoltage 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 cpvsbz0 (/)4pc5u 6vwkvm hr 1zurrent?

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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. Wi1xv/l st)zq 4hat is the resistance of the lampt lsi/z4 )qvx1?

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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. What is the peak cur(g,.qgu1msz xe -r5yxrent through the ress5euyg r1g-.(z ,mx xqistor?

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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. Wha)u(*m zq v 89vemq6x,hpel-zx t is the power dissipatedpvmeu86mqlh( ezxz ,)-q9x*v in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-6n0d(e) j7zohln4ug fW 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 5wcnro3 p0dy 5)0-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 5/q j*gcn .0.7wzenp.vo bmg2y0-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 reactance5u 9n: f(s*wop b2ultansr/ bkih1+k 2 of a 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 coil at 1000 Hz?8 tl.tm(wy3dr

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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 s1 n/fh,:xnigzt, t8kof 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; bgigs)4wb2w5 lu; yhb,wut, + tu1nx for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-m mzmks-s5:tx.i7rfg. H inductor when 120 V AC at a frequency of 20 kHz istgrxzf.:m- i.ss57 mk applied 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, 6q(f/bnx he3 6 rf4215cnz1f1aqkl obx0.0 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 reacpk1j02 igr,aw 7 1epaumc8 xw-pp jc4/tance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have mjd1 u75sb .jqsr)oi650 W of capacitive 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-mkr q,w-ili ;a:F 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 qam ;)0ck.h:q3iww gmthe capacitive reactance of a 0.010-mF capacitor be 100 W?m.km0;q:w)qg3cw a h i

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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 throu:vo6;ji+ei 7oo**:aw k xoowlgh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resiso7*lu7j c6ei ytance, 15.0 W inductive reactance, and 10.0 W capacitive reactan uloy6ij7 e7c*ce?

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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 Hf lpid):ek -2j.4tglb z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedg-e )iptf42bkj l.d :l 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, anwoi 61kw1 o)suwz58c.f p2ivzd 1.0-mF cw2i1zf6 cpwzi .)v5okuws1 o8apacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor1m)7qs 9 tov95ac xiff, what is the impedance atco v9x5qff9 s1tima )7 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 witam ;/; xudv5361okz)pe7g pz b9vcrith a 20-mH inductor, what is the phase angle atdt;mvrpv1b59/zcg a ) ixu po3e;z76k 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 sibce1 f27z)w leries circuit with a 20-mH coil and 1.0-mF capacitor for a toz)2bcwl ief7 1tal 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 followinhz);qaqziro3oj9 : : tg capacitances is needed in series with a 100-W resistor and 15-mHqa : tq9ozhjo:)3zi;r coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series witk2 /,pjdy3 qkh1*v2c soefu 9 mlj(h;gh a 450-mH inductor at 5000 Hz for a total impedance of 4000hc ;mud*y392s1hke ,(/v p2lg kofjjq0 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 a toz63r* :u;b; shs jdibe(zlp* htal impeh3upbz;d s*s;*lb ire(:j h6zdance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacit uau*nhzc65/,37kxqnz d m0h v-z6jjbor. What is the impedance a j/u xj6-5kzqn3 zzbh*vc6d7,una mh0t 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 neededg c8do ;ig6g)k in series with a 10-mF capacitor at 1.0 kHz for a total impedanc);kigcodgg 8 6e 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 o8z10q,unfw1 jxwn ; rfor a phase ang8 u 1;1jxr0nzoq,f wwnle 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 r d8t36p 3:zltf7vfw vdesistor at 1.0 kHz for a totalfdv l tf :wtpd7z383v6 impedance 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 (bb hz:t zt62gau(8mbthe phase angle h8mgbt ubb( z2at6z(:?

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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-Wb8zc a8znqr+ 26go o,a resistor, 20-mH coil, and 1.0-mF capacitor areoo2 ,naczz + ba688rgq connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capatnz(lq2s ibk r/+i qx667 8czscitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 6 2scl68sq6iktzrzq/xbi 7 (n+0-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 reactanp9jl -l3s5morce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in3ps-r5m l9loj 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 containw,1bd6fnv)l x ing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyf 1wblvx 6)n,d?

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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 5+we, tkqef u-:00-W resistor for a phase angle o+u:qkf,e wte -f $40^{\circ}$ 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. kl4ic/gt5*2gj.hxiq tq-+ t:h ot,evAt what frequency should t,hg5q-k/e4giqtl+ xth o2v:t. jct*i he circuit be 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 in an ac series circuit with 12.0 W resistance, 15.0 h 3 bsw-,tg/wk3x u(otW inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suwh3ot /3 w,-x(tsbkugpply?

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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 circu fecjnznrh++hi :09)nit 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 i;s (pamll-2i/uwuu glgn ;m0 -mpedance of 60 W and a resistance of 30 W. What is the power fact- u( nm0 gu2l ll;sgiwa;u-/pmor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resisx 1htl48u3nlf tor, a 3ln1 tx l4fu8h10-mF capacitor, and a 0.45-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 1.0-mF capacitor and a 15-mH coil in eznmm4i far:3dr(1l 7 series?ml( rd713 fem 4n:rzai

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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 capacitor for atx e+vj3t/;di p,w;yh.ptm n3 resonant frequency ofd;3;tt/te,j+ .hipn3pv yxwm 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-m(v74e ehyim7e H inductor for a resonant frequency of 1v h(e47ieemy 7000 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 pgn m 1+6ap,b)qr5*i)gess1prd l6pd tl2w /d be placed in series with a 30-W resistor and a 40-mH coil if the resonant freque1pplp 6dsbl mr2s e1 d/p)+*,gq 5rgwnd)ti6ancy of the circuit is to be 1000 Hz?

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