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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 n 5l7/aqq f+liunits 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 state4o5 (29tgb5bvtk vdyf s that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a cc09 nt74,)o du+lze pvhfdy/foil produces what kind of change on the inducpu t v+ /9,7fhnd0dz4 olyf)eced $emf$, 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 magneti(je -wb4e .d any+qdsmv)+ +dbc field through a loop of wire produces what kind of change on the ieby w.sdqm a+e jv4(+b)d-d +nnduced $emf$, 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 changfag;rhydzq k 6f o03lmq(js.an6*by:(ms81 ve on the induced jfa s 608( m*n q6.lbd:gfhzk 13mqyoas(yv ;r$emf$, 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 magjix7.eebya-: e /l1zr b)q9ga netic 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,2+wj m zsqp50fv8jz( .-ucznxoy48 nn the direction of an induced current in a conductor will be that which tends to produce which of the fo +5jj02 n.zn(v8fy-4n upc zmwxzsqo8 llowing 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 :j z)wen5fcb0bar magnet is held above its center with its north pole wjef )zbc:05npointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A iavsg 5qem5b:8+vwi s; qk;c.bar magnet is held above its center with its nortvsqq;vi;k.i 5mc:eaw 5gs+8b h pole pointing down, 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 tablem 8y:8 kea/pt wt/j 8r).mflme top in a region where the magnetic field vector points straight up. The magnetic field vpkteam8 . :my 88e/fjl/t w)mranishes 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 where the magnetic field veksg76rsub b7w t-:t 2uctor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fitsu : 2w7rgubkbs6t 7-eld 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 frv3p 5z 9 .uimujj3gv)ield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field dimgj).r9 vpizuu5j 33vsappears?

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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 horcehl5a nu3j-o8yg o0(izontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the -oy h3c5j o80gnuea( lwire. 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 withv,uhqp r-z5um9 ; pct6 the north pole entering first. As the northv,9 6muh5-p cqupzr;t pole enters 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 is rot;a. mc:e/ ab+m vvy7ltated 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 ori7+ml:cmvyte;/av .a b entation 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 ro 0wkcu u eg)w7ppu7io 3kv2u41*u.7cxvx9cp m tated 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 1 2cx.e)w u c34uxumpv kuw 0pouci*k 9gp77v7of 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.wwd22o6waz4d j2be 4roecg,3 3 1mljl
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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 ae );tt. l)yszyn $emf$ 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 fi1ujh cf/6ok* g:: obqoeld. 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 bnt :ne; y4w hnsw o(50jyw;*pnorthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indup ;o(ytn *w5en w 4;wnhb0sy:jced 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 rotatzqa99 2t9bu hres at 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 transform0s*n omedt gjq: rr261s

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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 tq00; afj r;jqzhrough 60 revolutions each second. The frequency of tja0qr fj0;q;zhe $emf$ 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 devic+a5rj lk ogt-190gylu e 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 device9l9pvk:c0j+ava 6-fsr2xqoi 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 tugnu3:a w t g**qk- n+kmw:zcyfqt733he primary coil thengnkc7akzq* uy*n 3:t -mwugtfq w :+33 it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more lo3u*lou7 1 vmvp ;bjo yd73w5idops than the secondary coil then i;ouv*ilpb1m5u 3 7 ov7 3ywddjt 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, th *kn3vf4;phcze 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 circuh pe2hn1k.1ws it,

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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 +,amzz xbk4e. /3ot7+conj nqseries to an ideal battery of constant terminal voltagonn7qzcte4xokm, ++ja /z3.b e. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in sue x ai+q,u ph,9f:5cpe:mh 8weries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the9h:,5feu 8p wxmq+ pi ,:uhcae 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 resistancpc *m*dwmp sioj1u*mg:u ;4of d)u 6s(e 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 isvk)rwqt3 w zm)92uai) 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 conn l( rs -p0r4u8qielrfdfss(*(ected in series to a battery. The time constant for the circuit represents the timeiu (r f-rl0psse8 d(s4(rl* fq 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 h3 ;f4kqddda1 battery. The battery is suddenly d3hdfd;4q1a kremoved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the ebg 7k3rx: db.)yh ;aq5 w0miyni :)a7qj1pmesame 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 anu.r3b u 4j6ugv AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuii3.yn43wpk-cic4rajp z(a 1ot, the currencyj -pa(3a4o ckiw3pzni 4 r1.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 changes by what faceimai, v)4+qt0jx j9:u;sd q9rytzt 9 tor when the frequency isx:4re9y9t)jai+v 9qm , szji0ttd qu; 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 iv3 .th*tejj6j1wyp2z b4j 69bpjv p. d,nf ts7s doubled, the inductive reactan 3 tt dvjw2 6phj,n96jz7ytp*1v.fp4jb bes. jce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, tbkc9:nz c 88jfhe inductive reactance of thk c8c 8z9jbn:fat 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 currh*rlsu(yg:/lwe1z3 0n moucn 75y sy-ent:-u13lsyr(hmg 7 nun 0/y5wsoceyz *l

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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 z)y bl /, n.bg1smf,zqcircuit changes by what factor when the frequency is nf1 .lz,/gbb)z,mys qtripled?

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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 h8*lr d:zei l,u4 ew0ta capacitor approaches zero, the capacitive reactance of that capacitol r:ezth4w0di,ue8 l *r

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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 anglq*)f:, v ogw g.odrp7oajb54pe between the voltages of the inductor and capacitor in a RLC series pd bopo 45og.:qgraf,*)vjw 7circuit?

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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 k;ii8tm ucwxw v)6v :5defined 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. :/r*vflci 3oj The impedance of the circuit increases if R increases. When is this statemlc/ro: vf 3ij*ent 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.-nueeos(lw ;f)3 b/uk 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 impek vlyk4m ,,o,5o1vx*ktqez-bvba /v 5dance of the 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 danli a24 ot)( ,uwzli vhrbj26ys8r+/ ouble in an LRC series circuit, the resonant frequency o+ / rvt(h6a,4 iilyas2b8w2)njzoul r f 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 apz1fe.c3zcr 9 n 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 circuipa+tc m9fso65 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 0.10 m is rotating in a unifori)aunfeg uvo4+b2) x;e h2)ui0 u,h xgm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ;,vih x g 2e0 fguuxa)h+)uoeu)2n4ibare 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 uz+74c pd+b blaniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a pl+zacd+ 4b7bnd 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 radiz i7)zcq aowjzlk;pck 6 36m54us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vpz)z35w ckaqli4mk c6z7o;6jector 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 isnn +q9mpt k(s9 r(n;lm 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 c. w 6 )p1oukq74n 8rpmixdfrr7hanges 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 on a square frame with sid+ww 3 n(2 ;1ogymd(gllmjb8se48u emoes 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 average value of the inb8+4udely 1 8wsmg3 w(e (jnmogl;o2mduced $emf$.

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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 withi; 0u+po cin vpeulk; 8r;- /pze0b8qd 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and zo/j8 (dxx1yp area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span *f 8,3mbzbw tlof 60 m flies horizontally at a location where the downward component of tm*f l8bw ,tb3zhe 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 rotates at a constant angular veloci)t ksx i8uad;9ty of 2.0 rad/s about a verticali;u s kxa9)t8d axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crossr2 ,r8gr4gyp k 8bq,bz-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 consistsvk.4xgah -r6 d 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 loops on its armature. Each loop is 12 ltz0ba rc +c +2x:y0clcm 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 pex2yl :ccz0 lca++0rtb rpendicular 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 consis5 9k+nyru1n uac. *ntzrrc 81its 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 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 generat:8k j 8mpycgcf)(nki-or with an output of 12 V maximum whejc8y (pk -cnfmgk )8i:n rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a ma; z;, rm+ixcecwo /6gvximum $emf$ 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 ope4mac*p4 cg8 d9payp a3rates 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 ,5. :bzswt snhz9*qw uyn*w *nytq,)y resistance of 6.00 W. The motor operates on 120 V AC, and when running at full spee* t .qnwh9y:,*ns t*,)suqwwz 5ybzy nd 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 connecteai3t:6c kja4ed to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?:ei6ta3j4 ak c

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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 resistanc//xv /zvgl5d4- k zlake 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back daz /5/xzg lvvk/-lk4$emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a m2r;y44 z jp;kjwg0oy 24-V power supply. The operating current is 1.0 A at fuyp;; k4 ozjj24 my0rgwll 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 transform7d8)zg ho,-n cz9 eijher is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes,omk /,lmc im u7w*6tl 14 A to flow in the secondary. How many turnktm m*mc7wl ,io u6/l,s are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V suza7-sa* ez2j *bs su/1 vu/bw6q/c osecondary has 1z2 -cus* j /szabs// e6 bw7osquuav1*00 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-turn secondary coi)3vsekri0 r-b l. If the current in the secondary is 3.0 A, w bikver3 r)-0shat 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 flowsz prs:gsy4 j dj5q hcc6(t.q35 in the primary of a transformer. Assuming 100% efficiency, how m43tpcdgs 6.zr y5hq(q: 5jc sjany 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 transformer6z kxo)na8u3;ua e*u a provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Wha an oaxk6u)8ue3u* ;zat 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 an .u6-m k)cx zwqqk6 recm(x,9vd 300 turns on its secondary coil. If 120 V ,u6m-kmkqev zxc xqc 9.r )6w(at 2.0 A is applied to 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 ,/i,f8 zmg amzturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current iz,a/mf g8im, zs 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 200nz.7t t z(,ez: eoi*cn turns. If the input current at the primary is 100 A, we can expect the output current at the secondare*e z .i7:(nntctozz ,y 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 transforms8x :h1rgfq4mer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expesr4 mh:xfq8 1gct the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has vdeg7 q4kz806yl ftl .200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to b.7 gvzd0ll8 fe6y qk4te (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 voltage is usually 7/h0qc6z ii3ybmj 3zmstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondari 3zm/ i7j6qm0hzyc3 by 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 steppedqaf9( -yu fsmve 1:6 yc +uz:t-rv-ffi up to 4500 V by a transformer and transmitted through a power line of total r:fvz --6+sumtrfau if:1y9( yeq-fvcesistance 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 volt yt6:l(sda 3image is usually stepped up to 4500 V by a(l 6m:t aydis3 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 stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.hut( vu-/zq:j92li jvhm7s z ,d+g, rl 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 alj2:rulqu,/z+hitm( sj-7g v, 9 z dvh 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 kmg r;i5mukw;i)iz.tz 5 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 enerzrt ;kw.m5iuiz)5g ;igy 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 do 2ab9tdlva7w3snwgc )omh 3* bpw6/n9wn a 6-W line at 1000 V. How much less power would be lostt) gvb7/w6cwa3b9a wm dop3h92*nl s n if the power 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 m t*/p uy*.)jv lz53 db73 -jvbjrsyl dz/*cxcV 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 i.ydm5bjjy x u- dvt/pbc*r s3*zl/jzc73) *l vn 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. wbc*a e.fynza; 9d:+otq8c;k0 A. How much energy is stored in the coil's magnetic fi* ockcawn+a9d8bq.tf eyz : ;;eld?

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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 containl b2x s*;gcjdugb: b-7s a 6.0-W resistor and an 18-H inductor. What is this circuit's time consgcb*:bu- l xs72bgd;jtant?

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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 isw-e/jsot:e bye+7+ 4:1dmocazsl/ *1hw ifr q 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. Wha()i3 5fs9uzvhlx5xai8 6q lpnt 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 1203k x/x( o)tjcj-V AC outlet. What is the resistance of the la 3xk(xj)jo/t cmp?

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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 peau;:gs. exfopx jcae7a, 39 -yak curre j, xa3f7 xpagce9ay:-eso. ;unt 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 12):c10h sdom k0aq-n sy0-V ac power supply. What is the power dissipated h -a scyqn:d)0s 01komin 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 resistolg6as**(qw4128a uor.nhj*iiv*hrxu p w- h a r 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 rp 1p:+az5a7jek: ,m t1ipgpga 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re( hvp; nq*mz3ip-k7ajo/w t7psistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH indch5ou2e-k t2jfbwtna/iezx5 +4h9 5 ym wx/l:uctor 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 kkup/ys, nm.4dv.f n7 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of in7 wmyxl :y--v8k1m c acj4pbj(ductive 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 1000 Hvsor m7iqmcl)g2- +k ,z?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHzolf cqvy7 8t pt-2mt+rs 6,+hs is app,f+cot hq62tm8rv 7+p lst sy-lied 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, .jwf5x xwx;n8vr8 (y2ri*ova60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a *p:yu1ljkrxqv+( 2ml-hac:2z8o zr tcmk c2/ 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 50 W of capacia1 0hplb2mr.;h*syq utive 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 capacibw2 xg)*;, ckq kuqrz+ef.ibd *0l4u ztor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0t8 -(wao-q eqk10-mF capacitor be 100 W?oak8 qe-(-twq

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5,;tb rzrys.y/y y)a2e.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 resistanc54:ksmv u:nad e, 15.0 W inductive reactance, and 10.0 W capacitive reactan 5nm4:avdu:sk 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 Hz if a 100-W resistor, 20-mH coil, i7y3*pr:jns o p4,he0xznx0e and 1.0-mF capacitor are conne si xxj4er0ph7 3*,0noe:pynzcted 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 10s*+ f7wv:cdkf wo.8(lo d l+fg0-W resistor, 20-mH coil, and 1.0-mF calf:+ (olocg7fk w.d svfw+*8dpacitor 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 ser ( epkcgti 56dc4,se 3l7/henyies with a 20-mH inductor, what is the impedance at 1000 Hz645e,he7n3i kc dstp c l/(yeg?

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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 irrr5r -a, qa 9yf.xvr:rg5:a,;wcfn q n series with a 20-mH inductor, what is the phase angle at 10r5qf-vaqyaa9,:r n;r. :wrf ,x5rrgc00 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 and 1.0-mF cat; -swnl62 a3ojnfr5 gpacitor for a total imped 6 n ws2rtf53-gljnoa;ance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with ah v2 -eazicg/i)3m7i j 100-W resistor and 15-mH coil to get a total impedance ofvj)27h- igez/ci 3aim 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 49y2qv2147 rgtjzv p,oj ieaj850-mH inductor at 5000 Hz for a total impedance of 400001928jpo7ij v,4tae2gz q yjrv 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 fojs9mr, 5 l 5d-d:pd kl:wckcj9r a total impedancec9 lml,pj 5 rs95d-dwk :j:kcd 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 capacitor. What 4a) *mn jwla2eis the impedlw*aen4 j2 )maance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz h*xv0pda r10ew. fstjd1 k)y. for a total impee*k)sad.1trxjf p1 hvw00dy. dance 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-mpsn0fn l) 6d0lwu r3h1F capacitor at 1.0 kHz for a phase ann3 lfu6dh)n rlw100spgle 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 at 1sztq51b0mop) ; l+/bl98 ;qxgbrc ffn.0 kHz for a total impedance obq bfx1o9c 5/ qlz0msrn)p+8l t;bf; gf 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 s5an7 n5d p v:pdcvrr6/i84msceries with a 100-mF capacitor at 120 Hz. What is the phase6r n c4pri 57s:5n/m vddpa8vc angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resishag4j*ga8 6 l7upg8q ator, 20-mH coil, and 1.0-mF capacitor are connecq4 up*jlaaa67g g hg88ted 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 coha2 9lzme.r9f5 ap6s apacitor, and a 0.350-H inductor. The circuit is conhlfz599mse2.aao p6 rnected 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 W, and an i49e/ .4fg bdxb6lz ohtrpoy-/nductor of inductive react6 r4dt b e9zybx/lofp.oh/g-4ance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase anglp37lgu djlc0.bbgyj j 7,;2efcxo);w e for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in jdj;0,cge;7upcw xb.g o3b2l)y jl7 fductor, 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 jtc //3q ozrjp)u/yf 8with a 500-W resistor for a phase angle of8j//j)y3tzq o fu/r pc $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wha17 t3mxb zv.z/p o(xnx9dg)p ct frequency should the circuit be driven in order to have maximum power tra1ztm9d7bp xcn(/xgoz .x) vp3nsferred 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 outnju c: pk 6jvvpxh 6qbu*61k3(put in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whjj pxvc6np6(kh*b u:1uk3 v6 qen 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 c uf. qgxigu)(0t-8s1d dq62k60vhchyq;vpj 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 resista.(m:ebt h qj;fnce of 30 W. What is the power :qf ej bth.;(mfactor?

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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 resisto sna 2*j7wklz -8o :kzsskwq,8r, a 10-mF capacitor, and aa w7o-kz*sjl2n :ws 88s,kkz q 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 c6chi: fwgf4-wsb /y* bapacitor and a 15-mH coil in series?wf b46ihysw: bc-g*/f

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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 withz 2wm)3v e unqxe8ot70 a 4.7-mF capacitor for a resonant frequency of 10 kHz?eu23w 0)eznotv x78qm

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needer-9blly)*s2 b7rs+y a qcxy.xd in series with a 3.7-mH inductor for a resonant frequency ofbr a .9+q-yx )ylssxl2 cbry*7 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 must be placed in series with a 30-W resistor and a(dtcz3b+e6a1( lxd r6xj)ga a 40-mH coil if the resonant frequeng )ax(6e6cd r1zxa3tjld+a(b cy of the circuit is to be 1000 Hz?

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