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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 magnetic l.4cep0y8.d stn6ew w 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( j52eoer4 psjiul2/t 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 wire4c..ch q71vmhby9eoz el5 m t( in a coil produces what kind of change on the ic.7 1 eebq9c5vt(yhmolm hz4. nduced $emf$, 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.5vbx u bqa-,u what kind of change on 5b,xqu u.avb-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 indu ouplm-0y76 rgh6qk(ulvn-4t (uu-q6yvok-4 6 mgp t0llhr7nced $emf$, 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.b./vm(zo1n-ywbtgb9 ; p djd 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 a6jjc9yp 6r5ran induced current in a conductor will be that which tends to produce which of thejc5 p6y6 ajr9r following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablrsb yyyj , 7 (fim/g t4-vm4f)dv)ba;me. A bar magnet is held above its center with its north pole pointing downj,4m g imby yt sf7dfrv)a;)yvb4-m(/. 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 horizontomo*;/it(ej q al table. A bar magnet is held above its center with its north pole pointing down,j *m/iqoo(e t; and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top itfho/p-b8da f+;pj )mn a region where the magnetic field vector points straight up. The magnetic field vanishespt- /+ao ;d8pf mf)bhj suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region wh +1o6l4m*qt1yhw b lxy, /kolbere the magnetic field vector points straokhwoq11+tby, x4l yl *6bm/ light 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 38fyxflz vc.* where the magnetic field points straight down. Thlx3.8y*c vfzfe magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increas zq,2sz bwz.d0 v7o4 pnca,dy;ing current northward. Two coils of wire liasy.vzc2o q7bwnd, 0;z p, dz4e 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 polyl bk1*3bw)cq 9iai7ydu ty5* e entering first. As the north pole enterst5bbdu9cyy y*)w *3 laiiq7k 1 the wire, the induced current 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 ist(nej3t( b2 oz rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pointe2z3n( jot bt(s 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 constanwts+ks s-: emt:ef-8dd:4wgg t 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 -t8dme: 4seg:g-sdw +wtskf : 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.49o2ij xn/zk z 7c 8q2 ctnwxa1pva;f6
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that ahnp-8 )wwr0 0j4gk pm4zz;fgb n $emf$ 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 fpai eg wjhxmi/n 99).,ield. 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-westk *zu zjf2/lb/u -8fxil5aq0b direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the u -2lafx8bk i fquj*l/0z5zb/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*vvbr fg4v(1)qe40te ur0sm o 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 txlwal4 5o3rld 2.wpf,ransforms

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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 revoll6 pefp+ 6w-ws1bje- zutions each second. The frequency of the p-1 fb jwpzwse+6-l6e$emf$ 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 used tu b68i.qo )d:; wsomr l7l7zhso

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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 uw 0ar5a98s0 0xvowhbm rz x5: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 containikk6t/p6 qn00 jf82etaj/xfw s more loops than the primary coil then ijf0qpx0 /6iae68t w kt fn2k/jt 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 primazl68kqx+sv6x/n s v h7ry coil contains more loops than the secondary coil then it x +/v k7vzs8 6lqhxs6nis 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+r i1+gaa29g2wl xfmlwer 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 circuiegu)xgsse/+ 9 z7nnm1 mw6 6fqt,

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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 7nxe od+8p4 ggyhs06n in series to an ideal battery of constant terminal voltage. At the moment cn 0gn p47ysedg6o+h8xontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batterr /p;e nvj;r/1wpt0m g(rnt2 jy of constant terminal voltage. At the moment contact is made with the battery, the volt/jpmtn; 1n rvrrg p2 e0;(wt/jage 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 inducta* nhkmoi,(.gcl 1cke7 nce 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 indu (i+u25xi.lqf xw zd/uctance 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 series to ycubf+.u2 qm h9ug 3*oa battery. The time constant for the circuit represents the time requireyobcf3 quu+9m*h2. ugd 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 s(9f/ fo.9mbe f6wg1dbiwh: j eeries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tijweb9dmfwo( :ff .bih 9g61e/me 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 e0l ip4/w3c*;zd tpgt the 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 supply. On this r0hmc.s/tm+w circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circ0qd:*vhz.)ct nlt-2ri)srp g uit, the curren*i).trns)pqcr:lz-20d htvg t

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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 chamu6hzcs g6 92t/ :( uu5elufyknges by what factor when the frequenum fs2yk ue 9 c5/z6u:(uhltg6cy is 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, t)sr .jk:oq(d:4 xrj .fit bf7ohe inductive reactance.o :4(sjr.f)fkt : biroxdq7j 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 ape6zridcnl7/b n .qxc 0*n 7h6qproaches zero, the inductive hlc7.d6 706 /bxinq*n zncqrereactance 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 f:xjfum4nx3n g /-( 8 y)jyoedpower supply. In this circuit, the currentjnxyx34 y/gu e )8:nf(f- omdj

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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 factor whezvsy)x lo e jlbzl24w159,v;c n the frequency is e)j1by zvxw zl2 5 49lco;,vlstripled?

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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, tv*rh4qzn -dk.ntl;l y2a1,mzhe capacitive rea vtnhy;l1 dlm nazr4q z-,.2*kctance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between tpce4 wxh: 9nmj3u6 d;she voltages of the inductor and capacitor in a RLC series ciew4sdm3jp9n: 6u x;hc rcuit?

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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:ajjw, 62alck circuit 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 increases ia4lr mchvxo99d6 j6krnvu4p ci;2) 6tf R increases. When is this stat4ouvdi ;nk6)l9r 9x4cc 6 v6m arhpt2jement 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 6k71kl0 d 2bpcz2hwzk6; jcmbthe 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 increases ie8 uikp4ki3j x .1m)no2f1 b*wx+ycvz f $X_C$ 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 capacit2 0,7q9ebpxdwom +n;iopyfh5ance both double in an LRC series circuit, the resonant frequency of that circ 5pnfyb 792phi ox0edom+w q,;uit 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 a-u)7s-a;-,pn u5 ehjhlmkx epn 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 circui+-egho5m;nz x t 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 0wt a/x3./t zlnzmu .wa,stj1 3.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic/ a/z3sw,tmnutjt.az1w3x . l flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifo u-t1r1tmo 7*0jukv oahg roif(m .:k8++gqbgrm magnetic field of 0.20 T. Find the magnetic flux tgfo: (0r7g vbqkmur .h-8+k1*a 1 +otjuiomgthrough 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 x wc ( 85bk*qji0tb(nlis rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo0bn5t(( k*lcx8w qijbp 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 ftjop)4 .xf+gis 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 fr qo p.ic* id,jf4ym08fag+(am om $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. m b3u;mi d/ek-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 average value of the inmu -k; /imedb3duced $emf$.

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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 area i)2moeakcm47of $0.40 \; m^{2}$ 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 area g)d fvo x/4f3qmltr p w:i0d:+$0.20 \; m^{2}$ 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 wingw2 s-at-lwt6hf+l: metclj8o 8m+q x4 span of 60 m flies horizontally at a location where the downward component of the Earth'sl2 c:s-exwo qa +6tm-m lfh48twlt8 j+ 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 angm)t+o wxoe3b/ ; rkd2,sff0tuular velocity of 2.0 rad/s about a vertical axis t eo0;rk bx3s f+/,2fu)odtmw 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 of y,f7*y*bp5pab js ew3 $0.25 \; m^{2}$. 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 o-nqk;i e ek5i7k;4 )-azpev:6lrl tn pf 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 a1xpcpnz9/:r o rmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage /rcnxppz1 o:9 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 wirefp*o+)xql,5ef ul0x(ay/oq e 6 ue.h y 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 r6k wlh1ab jag5-ea7;of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotawa be6ka5;1a-7lrj g hting 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 witzip5h ke.co:f9l lsa h8/bi-th5h(2 d h a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of -brfn8imtxd17m n(by /i+/ 1 dks9 rnj6.00 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 o i24mc:07x7b 6ld8xk+tf y kwwrxw,jW. The motor operates on 1 : o7mx blw, jr4icxw2+86dw7kyxftk0 20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internalwst- x8wky b9* resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Wky*wt s9bwx-8 hat 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 v09q*r)eyfaj connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the v*e0 rqa9)yjfback $emf$ 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.pzkf6g* c91tl1kb w7lkef v+ is connected to a 24-V power supply. The operating current is 9w16* f7cvpe fz+kt.kgl1bl k1.0 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 nee -(.3e1;hzwzk1gc xbyj,pr wfded 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 prim*h 6omm-jwg/8kyu4s bary of a transformer causes 14 A to flow in the secondary. How many mgs o6/w h4bu8ym j-*kturns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prima l.ux8 qt:2dmmry if the 24-V se28.t dmm :xluqcondary 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 500-turn primary coil and a 2000-tur uak)*d1y et5cn secondary coi e)da*yk51uc tl. If the 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 plysnfu4r w 8-,rimary of a transformer. Assuming 100% efficiency, how,-8wfs ylu n4r 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 tranqwq .x- y9/ x83uqm iz,to.qsesformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Weym/ 9q-xxo.s q .zqt3,uwq 8ihat 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 coi z6e+ - )(p8rs(bjotzrcnf) b .5moeuhl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presentcbt-ero) 5s)z.h zojue p 6r(f(b +m8n 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 onsgye)j0u ng48pz+4 hwu11dw q its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presen4 j w)qwz u8h4gy e+sd1unpg10t 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 tpd9 6yv* c*iadurns. If the input current at t cyd6* 9vaip*dhe primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turf.szuxtn*m f. lp6; ;sns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secon;mt*. uf6 xz .sl;nspfdary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and ifbz *qf q:/ksv ur;3(0vn7a m8-fshgpts secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of rmf nq;vb* vp0:sfak-78qs(u3 gzf/ h the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vu x4i00+klckh r5w. nc:c vk9woltage is usually stepped up lc0wc khxuk n:r +k9c50vw4i. to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the 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 voltag.*/u evo(rj-yllxvhsc8p0 u) q s 39eee is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmsr8q 0(. eev/* v-sc uhlxpy3e)o9lujission 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 oiq*9h 7cygg-lt *bt,8 ix/ancurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power los/*g ttq7ion bhc,gy- *xl8ai9t 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 -r+i/ nk pen6okm 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 ratio of 100:1. What percentage of the original energy would be lost if the transformer were /ekinprn+o-6 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 x58(o fcchuvl8 ()dro/ w;xsp 0.60 W. A generator prod/o( vu8xp(ldhc;cx f5osr )8 wuces 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 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 11nsv t/j qj,mq* n3/gt000 V. How much less power would be lost if the pj/ mvjng sq*,31tqnt /ower were 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 (csveke59 /tsV 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 s5/ v e9ec(ktsin transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s :wkxo:olrpg ms3 -+u9tored in the coil's magnetxm k+3:l:g- sr9oowpu ic 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 an( n)yizk nj*v5)bwsy/)/ sd jxd an 18-H inductor. What is this circuit's ts( kw sy x)jybn/5)/)*iznjdv ime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V4trc-x zg5 2x.culu,3 loqy5y?

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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 1e,+il8z1zsuu /.pn so20-V AC outlet. 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 r2m,y /pba8uminto a 120-V AC outlet. What is the resistance of the la2 yab,pm/rm8 ump?

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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 t 9fv. xd cig22:inliy.o a 120-V ac power supply. What is the peak current through thvyxdi2 9 l. gcf2.:inie 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 120vc((j (iqfz4( lcle 6g-V ac power supply. What is the power dissipate6czi 4g j(evclqlf (((d 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-W resistor i.jbui5 )iqov nko3) p+z wlg86yeyff2/ nbx1 *s $I = 0.80 \sin (240 t)$. 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 resc 6a d*jq7ajje7i9, zl) reak3istor 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 i t49x0-8 h8/tuxmgiofn yo;xa s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH nly1o .4yt8j mt*lek(r**dl o 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 .mxe95na : pj7p jyyp+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 141ndthuqsrx7m)s (+ q9.0 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 fh,w1fk8v /cf8t r;ri3ddds2 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 a9(jhyfjsbt1h ex 9.)b jbm9 h: 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to it?s.( bbj hbjh1hemft)y:x99j 9

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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.aa-g13u awku;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 reactani+* wtypft6 h2c-0lkhce 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 -anfv0iys s)1-uc ia550 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-mF capacitor have a reacta9a2yx/ob1z nwnce 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 ovyjhc 2-c4j 4m/p( p.-om iyk:0nuipW?-2py:4v0i-oi/n j.cmcp j kuy h(4opm

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 10w;k(c , 2hst8i/v yxxt00 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 resistancev f8 fmjx313co, 15.0 W inductive reactance, and 10.0 cfxf3om3 1 jv8W 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;t8ry6n*r.blgj bhd7ytua3za o-0m 7 -W resistor, 20-mH coil, and 1.0-mF caa3y6r7t m0t *yaob-jb.r;z ndgh8 lu7 pacitor 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 resisto1ij ((tzhwnqoe)ek0 s b6ezf+i ;8/zdr, 20-mH coil, and 1.0-mF capacitor are connected in series?eeb( w)otjed si0knz izhq;z1+/f8( 6

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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 inductor, w,3qo je /wrmo9hat is the impedance at3 emw9/ r,ojqo 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what66evaivmu2 8 l is the phase uel6ai26vm 8vangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and59kk9 aj t1tul 1.0-mF capacitor foktu9kt1l9ja 5r 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 neejn6xsg0ns1ng4a s bvx; 79y y2ded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200nn 7v4gb0 sxyssgx9a;jn 12 y60 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 x)(4/nadr(kaqt )u2gj9up bh Hz for a tot2 g9x uq(p/akr)j4tb dau) h(nal impedance of 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 qmarh i9 (+ d1s1i+z5i taaz+zput in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?a+zraq +td +i z 9sh15zmi1ia(

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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 si . wr5ojc3/grcask xn70v ,4ieries with a 20-mF capacitor. What is the impedance at 1000 w 4io ,x5gc /rjik.ancvr3 0s7Hz?

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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 capacito-wh icl v/8p+ caoi. w f;bqd38j1ve5pr at 1.0 kHz for a total i13cbo.vd;-v jq8ppl5a 8 /h+w icw feimpedance 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 ne+r/te71 mh pga -w+(:t ltnowzeded in series with a 10-mF capacitor at 1.0 kHz for a phase angle 1tg:eota+tw nwplz7-hrm+ (/of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor p+k o1-+zaij sat 1.0 kHz for a total -oa+ sj +p1ikzimpedance 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 118q0cvzdrrp1r o n+d) n3 reve8g79x m20 Hz. What is the phascnn d)+r d078rrq3mg p r8ee1 xvvz9o1e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 mgir rlatyy )(93 qrgx(aq)7r,ae s-2Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected -yggrq)a(i,el9 s 27yr(ra aq)3rxtmin 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 100-50re le+zxxoj t:+(o bW resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circux b eeo+o5(j0l+z:rtxit 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 capaciwqdl 6g-4wq6rtor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curren6 w 4wq6d-rglqt 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 containin6s ;trih. uac)c hssay+4y2o,g a 50-W resistor, a 10-mF capacitor, and a 0.45-H induc o4, yh.r+ )2;stusachsi cy6ator, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W s9cxzx9/z7v y resistor for a phase angle of s/yzv7xczx 99 $40^{\circ}$ 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. 24t d 4z4iyxxmmn,-bb At what frequency should the circuit be driven in order to have maximum power transt4y2mm4, dbi-n zxx4b ferred 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 kzzz -42cdk9 vvrs/9nW inductive reactance, and 10.0 W capacitive reactance, w/c d4vz2 k zz9k9sn-vrhen 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 u6 c iibo8w5(ic-t68t hkmo d(circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance o)5cpccimj0 e.omfy8+8a. lnm f 30 W. What is the powerm. m5n)88pyca +ec l.0fjcm io 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 cozqnx2 8x(3r q:3isyh lntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweh3xl q2z insy q8:(r3xr 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 series?oaek1q;n4-r xr uq+h/o q/xk1a4 ;e-+qnruhr

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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 fos5p ;uq diry5-r a resonant frequ u-;qdspy i55rency 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 3.2 ql03xd afvws9hn8cs (d9x s87-mH inductor for a resonant frequ38d2nswqx xvsas 0(h 9flc98dency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor muq96 e;b+hsg+n*qt w h hy9h1zyst be placed in series with a 30-W resistor and a 40-mH coil if the resh; +eq6qh z9hgn 1+hybst9*wyonant frequency of the circuit is to be 1000 Hz?

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