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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 un mzvo61wx )yx:its 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 sta :4+0v4(3gegh.p7xdvjeqca9ut awjstes 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 co nz 3vmchq-yj to7h2/(il produces what kind of change on the induj( mo-tzh/chn3v2y 7qced $emf$, 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 tlb8st,8ar st1hrough a loop of wire produces what kind of change on the inla88rs,1tbt sduced $emf$, 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 o 20t)tqgcp0az f a loop of wire produces what kind of change on the induced )q20t0gpz ta c$emf$, 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 d0:g69c, w bujazk(m6uv l9j ia magnetic 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( 39chmccpn 1.ngfm6i of an induced current in a conductor will be that which h36m1icc.(c9nfg m pntends to produce which of the 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 tablbs .yu7z/rs+09ohm/va.zk yae. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aby.7hbz.a0v/or / ys+k m9azus ove)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet ir1ltitkn3r0c +- - hqts held above its center with its north pole pointing down, and released. As it approaches the coil, the fall-0h+lrtk t- 3q nitrc1ing 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 tabl 277d uc-jswkyt y(a9me top in a region where the magnetic field vector points straight up. The magnetic-u 29jdy7s ymtc ka(w7 field vanishes 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 tablem46my 4 un-yyz top in a region where the magnetic field vector points straight up. ymy6uny-mz44 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 w.bkk+;g wi+f3*wvd zxhere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this co;wi *k bkdvwx3gz+.f+il 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 tastc8m 4-p.jg80sfzuv ble and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. .0psmg s8tvzc f u48j-When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first0e6bx,o h rb:erhp+)rrxmw 32y0sfx- . As the north pole enters the wire, the induced current will be (as viewed from r206rr x-beorb+exh f)y:wm,p0sh3 x above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ang43g f ivq(am .i 89mdmbg/nt/dular 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 tf(mbq39i .v/gg iddt/8 mna4 mhe 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 constany hhsama w*x -dat8;;9t angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poid9haay8x*-h; st ;w mants straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.r2tdpvb,fqli9jw6f 84.yfb -
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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 an 9 jxl8vv1 .ua(yuiw9v$emf$ 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 q onxa:b/h g9*mjx e5/a magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nor1vq5 0i5y0f -iy de7vmc pgi)hthward at constant velocity through a magnetic field that points syfhe7 m0i c10 5)d-5v qpiigvytraight 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 rotate1aw;.1 uhzp xvc7ur6ls 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 transfyb z,ll p 8te*r4w.g .(wtzfa.4dsjj6orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. : /. yg.dmxrsjfp o(y*The frequency of t(.jfr:mp. yxg *os d/yhe $emf$ 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 dev,l;*01oogq i (d cyyciice 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 devi /d u (+xa y0doyjr70u-m9j52qhji qxdce 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 cohs58h:3um ,sr)a uasg(aia 5 fntains more loops than the primary coil the3s,:8) rgfmhus55ahas u ai a(n 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 loz (*cosdi2pj +ops than the secondary coil then io(scjdp2 + *zit is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power6ynuqw qgn5ah6* 6yow47nb.a 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 1.) lmrhs6d k39isu 8/ntto (b8fnkmmcircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con*cbx.uoriol j 7r9m+,stant terminal voltage. At the moment contact is made with the battery, the voltmio.,9ruxc+o*rj lb 7age 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 idealjwc ,4p ky.mc *ol/j;x battery of constant terminal c,. j/wop km4;l*yxcj voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induct/8aih5p ks2de*bjd2t ance 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 t gjqxfi3: 4bq4o 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 ingp9x,e v.mlup 08ag 6wductor are connected in series to a battery. The time constantw xu9m , ap608l.gpveg for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an in5u( e9s zapu vtj+-yml13qi3b ductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for om 33sp5ub eiy(+-zuqv1 a l9tjf 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 same unitsk.twnp vqzx ) byf855) 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 ci mi5h;qb7 eo bf+78lygrcuit, 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 thisgc+ptu; fgg04)0t3o i0v* 5xcakvyw d circuit, the currenkoitv; p5 gxyv0 awucc 003+fd* g4tg)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 cirdjw+iru2wa8; 4v4 ,05l xnclfe e ja)lcuit changes by what factor when the frequencd84vcxeuwlfarn )j;w5+l,ea0l2i j4y 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 uo ty(0vq,eoz*vjn:tu c;x60he inductive reactance oft0vot x0nujuy (zqco:; v *,e6 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 voltag8y( on4jg( ;q1s,ezppx3 ip ive across an inductor approaches zero, the inductive reactance of that coilze4jp,i p3 v sg1p(q iyo8n;(x

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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 suppljzuuz-wek* q .50pte*y. In this circuit, the curree-kjztp.eu* * u qw5z0nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta8kk2s;j)rqwxieh5d:sz2 o 7n nce in an ac circuit changes by what factor when the frequencywd8k k7e oh:zi; rjs25)xns2q 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, :jfjf63lf nd9the capacitive reactance of that capal f:9jjd3fn6 fcitor

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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 ojzl fz+yy7:u mr)ng vo .i49,vf the inductor and capacitor in a RLC series circuit4o vz:ry+g.)y ifzj 7,l9vnmu?

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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 circe nsrqr(ph7xh;k4 z2: uit 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 incre2,1mxyqya f +eases if R increases. When is this stateme2m,xa + f1yyqent true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit vu8 m( i8xymc-gu wbqltfs(v ::w5x /0increases 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 vb+ .*yv8vrc lkx7ebf,p 9(osincreases 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 chl,na/q y :-35y0la uozjo4 fbapacitance both double in an LRC series circuit, the reson:,y 0z o/al35hyfnub4j olq -aant 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+888) (j svaqvqzx*)z mcyhzru; 1gbg driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whe7dh kc p959nky2s7tvvn

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20iaxe6) z ys.y- T. Find the magnetic flux through the loop when the plane of t6-x a .eyszy)ihe 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 uniform magnetic field of 0.2czt, zi - nld8da(kl jn0 y4adn)iz3:-0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpeli: 3kzaidzyj -tdnnz4),d 8n0l a- (cndicular.

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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 rotatingc rr7m+5) x ;ds)mb2 fvuiwiv2 in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnmr+i 5wbdi2v) xmv2 f)7;u scretic 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 adjustwa q5st6m9el d0q)8 ).s0xqmwr/ r hjxable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fi7k)rv)c) 2q jg9aturrom $4.0 \times 10^{-5} \; Wb$ 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 1e x7liomr4 ja kn802ron 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 average value4j1l2 0kx ronmari7e8 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 q tdgowltz:+ (8kob3*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 andx. 9gw,1o )8fx cndzaf 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 of 60 m flies horizontally at a location where thf800 vrykpnu. e downward component of the Earth's magnetic .0f 0 8uvnrypkfield 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::sv( 9kchygx+5 t hgh constant angular velocity of 2.0 rad/s about a vertical axis through one of ithg y (hhgc:x+ :vtsk95s 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 50hac2g2o59x:v a/ aonb 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 wire*j+s xqusm00j 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 looh*gsijwpf)1 cj :si* 7p 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, w w*)*cijpisshg: 1jf7 hat 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 areqrs.ut+v 2i m2+,yhn g m 5ooapgy,:o5a $0.090 \; m^{2}$ 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 t f1xfl4o6ia2hkv r g2(o construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 6r l xfvk 24fhoi(12gaT 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 maxi3w.i)7yzz z,l i(ir xfmum $emf$ 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.f1/6h osve(z1 gdcs-h 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/r*8: gpy psvg 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a backgrv :gpy/*ps 8 $emf$ 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 isy-9u 8* -yd5kpqz jaa 4,soslj connected to a 24-V power supply. The operating curre la ,kjdsspq*uyoj8az y4--5 9nt is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal smcnex(bs6( ,)su p,zresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full n(,xcpzm6ebs) su, (sspeed. 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 resistanc:*atrta/-u kl 5c.+lms 8o jqbe 6.0 W is connected to a 24-V power supply. The oprl+la s5t: /qo*ua - jmkt8bc.erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vosr 94ni+/jxaxltage 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 14 A to 7vo xj9 v)l7 dvr/cy+aeomm,eu ,9cy2 flow in the secondary. How many turns are in the vv,oxy/uymm7c,oa2lv7 e)9j d+erc9secondary?

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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-Vsd j/i7k,yvu 4 l3qob* secondary ha*/o37d qjbui ,lvs4k ys 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 p*x;g kaj4-qpw3tg5(olbuyn:00 ;x 2 pecgh p rrimary coil and a 2000-turn secondary coil. If the current in the secondar0npyrjb q ;h gt3 *axcgu0o g(;5p4l-w x2:peky is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a tranb)0d uac )bn6wsformer. Assuming 100% efficiency, how many amps at 24 V can flow in thed )b)a60u ncbw 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 sis)p8rvvu-y u g3+(ma ign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. rvy)-sp m+av (83uigu What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coi+hm.k i2 gp4knl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present 2g+ 4mkik nh.pin the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on w/.bl/6wln rkm; e.sjits primary coil and 300 turns on its secondary coin.e/ /m6; jwrb.w sklll. If 120 V at 2.0 A is applied 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 s;knn*q) yh:1wylmm 6turns. If the input current at the primary is 100 A, we can expect the )l n;yws*m:ny 6qhkm1output 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 turns and its secondary has 200tqk ;o51qj n4swvw ap ypi;(/- turns. If the input voltage to the primary is 100 V, we can ex5/ 14-sqy;akp qot wv(j; ipwnpect 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 transforo*ctr/ 4 jfuo0mer has 100 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 orfjtuco/ 40 *(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 rq, i0qqq2 vp1y+oix* 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thro qy*po+ixqr 21qqiv,0 ugh 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 120rq3bij b3.9uh2u) mla V. The voltage is usually stepped up to 4500 V bh3q3)b.ujlumr9a ib2 y a transformer and 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 d.7c 7,7nq8xz)s 8yb tjhoare60 A of current 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 pow ceo8)7hb7nrz .sjxa,7yq 8dt er 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 lonsh*x /z;bjcp81as/9g cyujy2g 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 sy;as8 9 21bh c/sz/yj*uxcpgj tepped 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 52zjo0 o0dkex,)h*a fm 0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is losta*2ze0hd mxo) ko0fj, when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woa fl0wmgwi1a29 0 5qqq u3jk1auld be lost if the 3i12 klqumgw1q0a05w 9jafqa 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 il,hi m8, cg2rvs 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformergil, 8,ch2 mvr if the power loss in 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 stored in the coilyvj2s9k1 uhozb x-*k. 's maok.by *-x1uhvj sk92zgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductorhe6xv +sl-l3q . What is this circuit's time co3vs6ql x e-lh+nstant?

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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 d ysyha(p-q o64qylb;, f27o uin an AC 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 outlet. What is the peak curref2 *hz;sfb9,ete .1h jcgwey -nt?

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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 resistance oe7.t-d5 iq7 gltly0 waf the lamplyw7ldi g.-5te07tqa ?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cur4zrkdpw3zycbv9j1 5 0rent thr v510przk 9dzbyw3jc4 ough 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 connec9ai.up6 tdw5.pm j(aated to a 120-V ac power supply. What is the power dissipated in the resistort..mau 596wa pa i(djp?

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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-W9 qzr-r8 9xfbqsok wm.xms .;- resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisb.e,g2zx +kfw bpg)y67qv kz(tor 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 :d:td -:duen3ihvp6 t50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ind5knrzks6nv6r8h3.t 6bc );kcy/u t jcuctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000x(7tp2 )ejnj714yr akwv rhra, k3)l m 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 slh5n )vg66p-czrjffg/+cv g c/i+)h14.0-mH coil 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 re,6cfpi rl)ma, actance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20rm nn 43y*6wyxw vm-.t kHz is applied to itnr4y. twvm6xy-w n3 m*?

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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 ou5 au1 6z- v tmhanr.,h25hobq6u;wf2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz dx1 hyo4zy23u?

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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 hxgen )+)z60.nrorlod7z at/ 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 reactance of 12yy e*-mm3m/s b00 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 reaca)eqyjayg- 59 .w2efxtance of a 0.010-mF capacitor be 100 Wy-9j5q g .eya2fa)exw ?

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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 10 o:y wd0snho cbf*1*.x00 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 resistance, 15.0 W ind3p 5d;i muiy,e-3biuructive reacta-r33,p5miibe y;uiudnce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 10 (d o4s;++cdnwmceib/0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?+ dcs/(4;en bw+mo idc

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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 1u)5c iwhk m2p1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap 5ku1cihwp2m )acitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor*)*iuhgtck)fk :a dg+ , what is the impedance at 100*+ctfiuk ) ):hk* gdga0 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 26k qecfn zxr8e(r:zrwr-- / n90-mH inductor, what is the phrecrf(e98z n r-6x-z:/ w rqknase angle 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-micxt0l *h b43ac79 weeuzo9z6 H coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 9xo0ewc 3zla c9 7*iet6 zh4ubHz?

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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 1akkplu kni w) /(rbq*5, c9pe300-W resistor and 15-mH coil to get a total impedance of 110 Wn, 9uabp)q *5p3rckl/kwie k ( 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 serie2y8wn :m+ p7z glx70zgvz+crs)qqz n;s with a 450-mH inductor at 5000 Hz for a total impedan0 yq)qnpznmz+lcg z2 + zg:r7v8x;s7wce 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 put in series ykd l)om u f jpo42.lcos-d aq;(f++4bwith a 100-kW resistor at 1.0-MHz for a total impedance of 150 k o m-(yjq.l+)op;sfc4ka2l 4 +bodufdW?

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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. Warch.wmte8b 8rva ah7)/jc q;dx7;a) hat is the impedance a xhrj7tdc a .) wac8aa;e);87m/b hvrqt 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-mFc3w m gerk029 ai-s-ba.dyt0c capacitor at 1.0 kHz for a total impedance 2r9 0s3kaai0g-b we .-cmyd ctof 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cap*b* y(z9ewxp*z e og7hacitor at 1.0 kHz for a phase angle ofz*e*x(oe9ygz w7pb h * $40^{\circ}$?

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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 in6k -5zk8fykd5yjzua 09b gm+ s series with a 30-W resistor at 1.0 kHz for a total impe-kakf6 5+kb u05j y 8zzgm9syddance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What id2zoy -rp em;g d7f3w7s the phase an fyp77gord w-m;d3z2egle?

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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 agyp 0r:.jj lhf u.)f4ie63uiif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in u:e0h3gr4uja..ij6pyfil f) 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 y6vonv-x 46nsv3 zz cbano+.+consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H invbn6za+zvsv4o n o6 cy3n-.+xductor. The circuit 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 3(eby)bq). d ry0 W, and an inductor of inductive reactance 30ey dbr).ybq() 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 angle for ,vq .)dgwbgvxiqub(1h o 6 1g;, iuv5ya series RLC circuit containing a 50-W resistor, a 10-mF capacitor, ani ,.vbdi5vo1u1vgg(h ;6x yq ,g )buqwd 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 500-W re1 )/ *lumvko 30zxou(e1ppn.p8tl. pji qh0oasistor for a phase angle oloup 1l(x/ oim8 kt1pjp03n*pveq.o h.0 zau)f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R9ae dxy*fts(x ux*2o( = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order (9ye*o(xtudsxa *x2 fto 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 ace 7n*/ i*jgpuj series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whe/n*7 *uijgje pn 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 cir5(yl xlz-4 yrqr5*jui0; lgz :e5cdro cuit 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 of 30 W. What *i0 /nqwucf8c+m:ef bis the f8 ceb/:m+ fiqu0nc *wpower 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 fji, )nqnc hrjkem49*-or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0n9ic-*je),qnr j4 kmh .45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH ced1+v2ybxzw3;rv9z)(flro c oil in series?1y rx3 29+zlcr dz(vfbove;)w

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant koi9tmf *wza,h:h 4b+freque,t9*:hmibfkhz 4+ ow ancy 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 inductor for a resbc8r (u3n*parjv2ge 6onant frequency ofr6rcbj a(e32ngpv8 u * 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 reseuo35sydfp ) uj -*m z+7dxl)gistor and a 40-mH coil if the resonant freqzs o+pydjx3fl5e-g* 7)dm uu)uency of the circuit is to be 1000 Hz?

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