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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 units0xe5gd7 / vflk 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 state:smg( (0zx lbys 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 ad xc6u jwii0:)t;1f 5ksqot5b4mqfv; coil produces what kind of change on tw1vf k ;mtt i 4qs 65u5cb0ix;doq):fjhe 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 th;y3o v xonzed7b.k ws*4ot3i+rough a loop of wire produces what kind of change on4n3vey *t bw; iz.k+xos37odo the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the indu2skfrg3h-iaw k v 6ges.ofhpha8 y 7;db,+n2- ced867wpib-,vdhea ga-sy.n ko 2f+f2hs 3k rh;g $emf$, 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 magne s5iv tt ).l4fobrrh9,iu;t o0tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curr+rp 7r a*um;ym33x rmvent in a conductor will be that which tends to produce which of the following effect;3 x7rmpuvamry*m+ r3 s?

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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 abov j52qqf(8g nbk m9w5zwe its center with its north pole pointing down. The stationary magne(wj 59 bk 5qq8nzm2wfgt 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 liesxdtoe6g i, aq8( xdc11 flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it appro gci( a1,8tq6xexodd1 aches 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 ah6ypkpt(iqd53 v6m 5 m region where the 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?kmqpy5vdh(6i6 3t mp5

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetr0 4gecf)j gawssg z0 h5y,*c3ic field vector points st,rsg hew3*0ggzj0y cc a4)5sfraight 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 magnetic fielk xf+kmg 9idmi,sfss, 4(xj b1h:--jjd points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direc:kksx-jfxd4mi , js,f+jg mibh-(19s tion 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 ca+cyx;le(6ro n rries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the indue; lc r+onyx6(ced 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 eq9j9at5n ,pqq9th 0aex+g ;ffirst. As the north pole enters the wire, the induced current q 9tje 5f09 eq;gap+ ahxntq9,will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire tai4 u u2)dje*(djk* b7 ejgj(is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniformjkdg * i(dbe 2tju*(ej)j7u4a 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 rot2u8 kk2ur3yj6 6bp rpwated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of uu 68ryk pkrjbw2236p 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.u7:fsbm5 + hxvwwc )9m
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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 tham le1nkbc (akr)d(e15ud xu5(t 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. ym+kgw ) ag g 1b,lej,b0s*8fpThe $emf$ 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 z+ ozl;w-f- qtmoved northward at constant velocit f tz-qwl-o;z+y through a magnetic field that points straight down. 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*yi2j: ks/f ktl( z7hb a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trafzgvxl/ ;z 1-/sj m 2bgdwps2g(z (/osnsforms

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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 th:+ro qtdwodxz3 0x4k(rough 60 revolutions each second. The frequency of the0x o:rwo+z3 kd4dxtq( $emf$ 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 dev37i,al jq/kj iice 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 device thbx,kt1(.-i gyto n8e w*x6ks bs cdt*vb0;w8fat

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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 t52kpb.o0vo3 n k.ks mdhan the primary coil then it is m v odk0bponk2k..5s3a

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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 the secondary e gcqm4; 2nr1dcoil the;m14dn eqrg c2n 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, thek ,aw7n7ecs 7 qeph5;i power 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 /69 nbbw w94b vy.buwc12:pdd2zkr idcircuit,

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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 connecte4sju* qs ef2jdhw) ro- o,a4ajx9o;,fd in series to an ideal battery of constant terminal voltage. At the moment contact is made with the a,uof jqoa,4sx;2e9wh4jo-j*rs d)fbattery, 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 m;i, w r8bapvy/)a3wsto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across p w),sv/bym38ai;raw 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 w +rfq6u 8o ni6:lp2 5yotx)zarith 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 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 to emvjl ;o2l*3updk, d7 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 battery. The time col13 jz u.dkte)zqf6r ()eg-csnstant for the3e6z zrsc kd)() u-e1 tfqjg.l 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 inductor are connected in series to a batteryg lywe);ge:1-yxs ;cy. The battery is suddenly removed from the circuit. The time constant for of the )ec lwsey1y-xy:g;; gcircuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unigx3.u fa un1( 6/qv ubqs.wxnom-0d6fts 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 this circuit, the currenj z.25m patbn)t

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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. wd;zvo hs9 f,55b0oe g 35fhyqz 0(flg In this circuit, the currentdy 0ofwe( hl0;3qfzh 5sfzg o,g5 vb95

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor whe-diap2po j25ja do2vg1 w/ vb;n the frequency is tr1wd 52j vjo;pba2/pio-av g2 dipled?

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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 inductkwzt/ gor q 8jz5g(9b(8-qjtyor is doubled, the inductive reacjk9gb5 /zqzto8r( (qwt8ygj -tance 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 ap fmte h )h50q/n+fg;fpproaches zero, the inductive5 gmnh/fq )ft0phf;+e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cipbz8z*.xf.gpkyc2s 0 e crk 06rcuit, the current.kbc60 pkzrscfg.ey02*zx 8 p

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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 ncr ml99w./lpm,we5 hby what factor when the freque/,.p 99lwelmnc5w hmrncy is 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 across a capacitor approaches zero, the capaaip(tn 97c-z0b-;lh l 2j xbqlcitive reactance of that bl nxi7acl-h; (tl qj -p2zb90capacitor

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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 inductor and c9 k,hcqp9url;:r z;qr apacitor in a RLC series circurhquq9lc;rr ,9 :z;pkit?

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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 icmn,/05r nc obed- tz5s 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 impeh ,;b b*/ik mkxk-(jvzdance of the circuit increases if R increases. Wkbj,mvk* b/k- zhx ;(ihen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance o uzu7gyrue-sj(jwl(ga1 331 af the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inhf+w s0-mp7d acreases 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 do7 aiy52 8;hmuhpk4ko duble in an LRC series circuit, the resonmyda h85;u k2pkiho47 ant 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 circuit that is driven by an AC applied voltage. axj7 f. 0av29 mhl7wkkAt resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs / tey:*fc-9y6onlpj a 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 unifomgl*5.1y ejr9f 4v wenv; r9shrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plan*mg jf4s.rvyne 95wlh r9;v1ee 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 unif msz40+25fhvswpl;u 5mn uzd /orm magnetic field of 0.20 T. Find the magnetic flux througuz duv+ s0fms5mw;pz2 nl h45/h the 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 magnetic field(ef.1z2nm0ue8 z wcpo of 0.20 T. Find the magnetic flux through the loop when theepn 01c(umfo.2z8zwe 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 ry4kl. :-:q:kyj ilanqh( hi8m educed 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 felw rz5y5**b-avmq. qrom $4.0 \times 10^{-5} \; Wb$ 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:qpgmp) 2aw45k s/p6y x cv)rn of wire 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 from 0.50 T to 0 in 8.0 s, find the avesy/p4wgmqn p2krca :)x) 5p6vrage 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 ( ljtt:u. eby*db4mm .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 ar3tm7 r7g/0o g+(t1rs xgampfl ea $0.20 \; m^{2}$ 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 location b,0rphx)son6 where the downward component of the Ean hx0, op)rsb6rth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular veloc(xxuo7 k0v35m +2xqqkvau of 2ity of 2.0 rad/s about a+m20oq2xu 5xk( 3kquovfv 7xa 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 h);2n;vtpf +m-61mfdh i pibnxas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wireg7 5nhupkoc 19 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 rectangu 8l9jae7+c6ph f1na68lkx cf olar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotatel ce98 nj6aoa +f71f kl6xhcp8s 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 ak g*i4) +esqs6pyvzl -rea $0.090 \; m^{2}$ 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 8+nwds +edx;wc- ilp1simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetdl81 ncx wpe;-s+wdi+ ic 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 maulr7 d/9b;bud0k w.;(kk okcgximum $emf$ 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 operala2,j dc (9sw 7qxp)eztes 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 hh u5a mx+uuy4t7* l1ghave a resistance of 6.00 W. The motor operates on 120 V AC, and whe*uut 4 5hauy7l+h1xgmn 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 supply. Thcjs+l / )dcje -fro92 g(6nudie operating current is 1.0 A. What fdj(+eogc6r9s n2 udl/)j ci-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 nxye 7+bz0 9avsupply. The operating09n+vbe a zyx7 current 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 Wl o,m /3oe8vo57v35tnhp p jaq is connected to a 24-V power supply. The operating current is 1.0 A at fp533/hmpta5vvo87j oqn , eolull speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to ytfv9kxh) v,c.cm6(u 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 transformer/( s,lrtlnn f l4q)i:q causes 14 A to flow in the secondary. How many turns arel:)qrnq/4ltsf(n, il 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 man9w-/cl;2j epe54 dj p.w 8e(xmhlzqxey turns are necessary in a 110-V primary if the 24-V secondahmpwx;jepdj589 xw e cql/2 z-4e.l(ery 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 500hnitzjt(y4+ el2/;lu: ) 3qms t;appi-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 primam:at+ t42e )(s zuq p;ty;/ni3 pljilhry?

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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 primaryv r2 m9a:pdr+yfmpl-,qgho h 656 iu.y of a transformer. Assuming 100% efficiency, hr my2q6uhd-pr 6vf5p:gy m. i9,+loa how 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 transformer provides 750v.;3nc gfk3k f6re)hq0 V at 10.0 mA. The primary coil operates on 120 V. What vn 63rkq.f g;khfec3) does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns ow +0m tpv29ynipa9x1 dn its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondar nd9w p+2xv9p10 yamity?

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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 tunsj;:cpd1ejels 4qrukm; /*,rns on its secondary coil. If 120 V at 2.0 A is app4 l;,sck:*eqnjudjsm/1erp ;lied 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 secondary has 200 6 sf.wwq v gtb-+)heo7turns. If the input current at the primary is 100 A, we can exp.et v-w)6s+o7fq wbg hect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turng):;.oy vkwjn s and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconda y;)jv.: nkgowry 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 4qumnt87 t 7i*/zc7m4hbnjzzr 57wvl turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiontz 7m qrz8n z h7t77w*4u/mjnib4 cv5lal losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste.qo.s8htz5kn 1 l)ryhlo d- 3upped up to 4500 Vlyo)hor zh5 lu8.dtn-q. 1sk3 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 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 c ok+-5+ta 3t7hjdkcs voltage is usually stepped up to 4500 V by a transformer 7odj hs+tk53tc+a c -kand transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped 0z0(bi j arervjzclg6yt :c78bh) x :8up 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 is not z6axc:b(l8)z:jgt0 c rbhryj v7e80istepped 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 resix5 ,htvzu(q/vvj 2;hcstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss d uvxhch,/ z; v5t(vjq2ue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resis hubzw9,fqn9lkx;k5oe7ttd3-)n *lhtance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission -h9tkl;kfhze n,u 5 l3bonxd) w t*97qline, 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 pow9.2 a0)(oemeegvqmuid hv 5h1er would be lost if the power werh2.)v9euea gdi05me vh( omq1 e transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transm g qmz12fju;)qv,u n74vaidl6me ,4j hitted 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 ism4 qeij lj7a hfudgq,4)n ;,uv2 6z1vm not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stor pnsqj*x;3* zged in the coil's magnetic fiel s gpx*;n*qzj3d?

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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. Wha q3a:yfc gnzhg7ww5vu7+(w 6 nt is this circuit's time const w3+ufhz v6wna 7y(q 75:cggwnant?

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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 d9f)joh7f 8tvAC circuit 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 opjqjm1yx) g9kf .id9s02blr3utlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the r muk.lew .k -+kddii8/esistance of the lad+id.mk8-lkk i we/.u mp?

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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 connectedz.s i3xcdgpsb.f+611a-/hxn3n fh/esuyp 7 n to a 120-V ac power supply. What is the peak curren3+x u.3hc6if /n/nhd g 1pp-xa .fzssb ne1sy7t through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a l chy4gd-+sqtngf9g* +rb o98120-V ac power supply. What is the power dissipated in the resistorrgy- b * 49cn8h+dfsqlg+g t9o?

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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 rx*i8mt;epn4 d esistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi n)wtbl*v,qu+stor 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 ,vuf f2jq vh:c1q:xi.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 oft(r0qlv2nx * qeyi5r: 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 ofj:tck0olk,hp /h5lgnx61: vt.rp w 4 w 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 )(prs.2hb/ 5jiz fxw(ucz-lw have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at rjw2f 2/0sibt 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 6tt c*.iqt(d7 p0-mH inductor when 120 V AC at a frequency of 20 kHz is applttq*p dc 7(.itied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source? p +mq*0pbwof8 sz*m3i

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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 khm zcgm j8;1kxe1j(u/ Hz?

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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 *:g6*tc asqofjg/i*w, h2fsb10 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 havem9,q ..xz nmtj 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 capacitor be 100 sl 3y(.qvcymp*ysy nck: y(5;b.u*i jW?s:;5(j* yv3uy *k( nyqybsly. pm.cic

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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 ck:ng,0 atutm 2apacitor 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 sy5b5 6/l o/ jt-3pi lkwyx3nsof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitioxknp5sbl/ js56- 3tyi ylw 3/ve 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 adki+gxl(.f k 6 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c 6f +xlik(gd.konnected 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 r c0lb,vs)aa4tz cdb9k) 0/yyHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?vkaz /0lyb,tr)4a)c sy 0cb9d

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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 indf-6 xgdo5 /pohuctor, what is the impedance d-fg6h5xoo /p at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2w,.; dl* i+txd5g uz5x; bhecl0-mH inductor, what is the phase ,il b;wt+;e5 *d.c5xgxh zudlangle 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 +c3)nhfa) /v4niu3 n awid f;oa series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W )an)4a/w;f 33innciu ohdv +fat 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W 8ccxm cu;2.re0s4jp y s si19cresistor and 15-mH coil to get a totalc04 p8scx 1r92cjc;s mu.i yse 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 with a 450-mH inductor;je rkzv2+19py 0ax ms at 5000 Hz for a total impedance of 40000 Wzar2pk09e1sj mv ;y+x?

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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 fobz:gqk;n7i )mb- m n;ur a total impedance of 150 7gm)bk m u:n;-zi; qbnkW?

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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 cap(dd-*rhdd3w(syd . zn acitor. What is the impedance at 100d (zh *wn- (dy.3rsddd0 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 d3p)xs )t1k+ qxarl0-sgf .fmcapacitor at 1.0 kHz for a total impedance of 45 k13f q0x rtsdxp s-l+).mfag)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-mbmoir . x;):ztgb.hfua;fj10F capacitor at 1.0 kHz for a phase angle ogh f:jbai o.xtr 1.0b )zmuf;;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 1.0 kHz for a to;lmrqnnfq3c /b( ,ly mwom412tal impedance of 45 ,;l4m3o2n bf rn yc/(mqw1mqlW?

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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 seriu*e q9 sat+,djes with a 100-mF capacitor at 120 Hz. What is the phase angleus +tea,d *qj9?

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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 anvqeh9jat ) :o1d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaq9h)v1tja oe :citor are 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-mFmo1k q0 k,uutrj.)1mz capacitor, and a 0.350-H inductor. The circ tummk, qu1)1zor.0kj uit 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 reactance 30 x9by 8 dc.3zqnr 9wkm ,0rhi;yW, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. r93 9nbq, 8 ;kdxyzcmi0.yhwr 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 5( orxu;9eb; b+zuv;vn0-W resistor, a 10-mF cu e;bx9 z; ;b+urvnv(oapacitor, and 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 500ma5s1k63sawx g09nal -W resistor for a phase angle o51maassngk3 axl90w 6f $40^{\circ}$ 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 = 20.19n3m3r7e fcv bcop,c0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driv3omrvce7f 31c9b,pn cen 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 resn4bk 2xu00vbh q *kvx)istance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when thev4hv 0)uk* q2 0bbxkxn 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 s:5 ra3+qi .g6jqcarxcircuit 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 impe voxz7 23z1k htuw/-didance of 60 W and a resistance of 30 W. What is the powertx3d /vo kuz 271wzh-i 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 fac-q( frbr:3ml 9xd*w tw5i si+htor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tofq bhlr +rs(ww5i3 di m-*9tx: 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 yx0z 3mgzg(+k 7a/h6pearng0 capacitor and a 15-mH coil in series?p(0y zhgkag/ze rg 73x +n0ma6

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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-mFo8hvq(2w dfxs/f7 fwa2-ej4e capacitor for a resonant frequency w(aj eo2exd4v8 w/-f72fsfhq of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inkwsd 1m a+k7 y /kg7)nj5mq)zi/,ujfnductor for a resonant frequency of 1 f yzn/ks) 5)ikwud jmqn1kmj,g7a+7/000 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 resistjd ezu2 2; 2os8,u,nz*uvohag or and a 40-mH coil if the resonant frequency of the circueugnuh *usz; o2od2a, z 28j,vit is to be 1000 Hz?

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