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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 fluxd( w5onkeo uw8*g)b7tkf- +xs x;r (ra except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thk-i9.sb g)/f wj0tt( g+lntfhe $emf$ 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 wirey)h9sgh36g0 ho .d gnc,hg,zbk97 dnj in a coil produces what kind of change on the i67 kgchngg g,.shy 0n3 ozhd9b)9h d,jnduced $emf$, 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 f. qk2h62 zkt.)c w oioxol,2sjield through a loop of wire produces what kindjzwck, 2 t2 2i.o l.k6oqho)xs of change on 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 i:52l (xqhxzn8 ;noujds );dbdq; /guof wire produces what kind of change on the indu:x/;odq2 ;n;q8bdd nu )(juzh gl5xisced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field aq67hop ;u nr1,/kkh(sz8vl-wri j2pdn $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ind14op4c9 bwa aouced current in a conductor will be that which tends to produce which of the followo4a9 c4 p1baowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abov+q; f+x ty4 +u9omv2cmn 1hmfge its centv9fomy mm;2 4gnq++ux fht 1c+er with its north pole pointing 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 fl 3)q bj0ke1u h1ga3rslat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, bl3 ukeg1 3q jrs)10ahthe falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a reubaca 84 7- b5trjk(shgion where the magnetic field vector points stra( -8acsa7tk5hurb jb 4ight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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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 d+cf3ae 7i,jw k.indp0 + yd5kvector points straight up. The magnetic field suddenly grows stronger. When viewed from above, whaafi k++7 e dcjk. din0,ypwd35t is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where t g.g 8g;ccnwu0j:1jf yhe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current i8wygj: nf .cgj1 c0;ugn 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 li:k ppf1 qd10fls,m(4y2 xubrc es on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either sx1bqpu :r s,flm 124pkfcy 0d(ide 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 pole entering fir15mcv oeofx9y6o)5* hn;v h etst. Asoh55nfxye ) omctvh vo;69 1e* the north 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 rotated at constant angula1po.a.a kd-ktefq -5 dr speed about an axis whose direction can be varied. In a region whekd .f- ke to1ap-.adq5re a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 vetl-spb9,l)g 4zsh: y i+dp6 constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the ,p6lidgb+hp s yste v:-)l9z4induced $emf$ 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.1c6vautk mf v8;kj6m3
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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 t*xr2zr-x, s qphat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field wpok/vw:d s,2. 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 movedqsa-g 8 r4 kp:/xjm7en northward at constant velocity through a magnetic field that points straight down. Make a statement conkg asx-/qpnj 4em8r:7cerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a76: ytarnj+f 9e+rt -d jn panghfvl3c:,*bm2 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 transformsnef9j zq4laexy i 6*k9f7l8g-

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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 seco lpy:cc ofg4mlylg :2)txr.:0rsr7 .wnd. The frequency of theflx :4ry7r) :m0tll:og.y.wp c 2gcrs $emf$ 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 k6p zp vfsp-*jtu,m),(n( qaxused 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 devic*kpwtp3 uux3x(q8neh1-qdv3zw0 z 3 s e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prim*uz j d-2e(yonary coil thennu-d(o2e j*y z 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 loops than the secondary c.3dx x:jgz4x1jv+b ;qqko6xe oilkq4jx x.j be ; zgq16x+x:ov3d then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powewyy4zyb 3pnf s3mixk o( b32-j40m(zl r 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 circut9zo /a 9b 1j*ae5nakbit,

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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 c+i7 g/hidx. bkx04vc: xagtp*onstant terminal voltage. At the moment contact is made :x atxbg+p c.d4vi/*gi kx70hwith 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 baj4 iu;s- qp67s5s5yg9v ihor kttery of constantiyu4ji5 vr6gqs75p- k s s;ho9 terminal 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 inductance L and resistance R is connected 8 dlpdyqltcbmfpz+ /8 21 4j16pnnt8i 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 tolwpve;pjx: mz9 djf8 p c1fj7e b.)3c. 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 inducto/.z7zvkz 8 sqtr are connected in series to a battery. The time constant for the circui. 7s/k 8vzztzqt represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batbmm59bzl6 (2 m p0arguw i7tt7tery is suddenly removed from the cirurm imz 9wtmpb (ga7blt05726cuit. 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 same units e,xj8g3egd,;d y 5fhkdxcept:

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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 circus i/t16tp:a cpit, 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 circuit, ki 1/p6jr. dzq;v2jiethe currenp;. /kz6 1r2eiqvdjij 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 change rq,mdzzah3)3fx/) f8 yhu f.xs by what factor when the frequency is tripled?3ahq8 frmxfd))z/h.3 xz ufy ,

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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 1igqi c1lxt (*AC voltage across an inductor is doubled, the inductive reacl1*cq(t 1x iigtance 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 AC7(lfa4vc7.km pf6qq t voltage across an inductor approaches zero, the inductive reactance of thv 7lc76t4qmffaq( pk. at 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 currunh( :z d6fo23qxa dp1e6hu: 13d(nqx2daozfpnt

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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 axxe loux;vl./;5sfg . n ac circuit changes by what factor when the frequexu of;ve. gl5/x. ;slxncy 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 :1/ izoblwsu)0 +i8b rjlog2lzero, the capacitive reactance of that capacib wg/8+ i021z)uolbjiro : lsltor

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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 th+18 vdumre1jje voltages of the inductor and capacitor in a RLC serij8 1+1dre uvjmes circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined xh :le0vl/1dyuw3+a6dm( ky cas $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if Rrz )emec:* 7zy increases. )yere7 mcz*:zWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedancerupf2 e p47hypn:eo;lij3i 6 p.-e5dk 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 cirow5j (r+ ly,pqcuit. The impedance 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 double7zx0,-j6qpmgyyjy+ k in an LRC series circuit, the resonant frequency ojjypk zy +6-7,qygxm0 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 an AC applied voly4jsz j0c:1 v8gyb, mutage. 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 ci-6iw6m7kk iut rcuit 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 0yo3 lihl+s(;v 2 g2ghd1jbkw5.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throu2+ 1gjsoh5lw3l ;y h2kgbvd i(gh 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 uniform magnl/nz/r- x8dxhw pm-/letic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perxph/r d-w-l 8 zmx/n/lpendicular.

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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 radiuow y: y.c8um.ss 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when8myuy cos. .w: the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singlc4uyf,e c;p 7ve 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 cha4 zibxy ys5wd6mq43(d nges 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 tb.*w )7uitmd yurns of wire on a square frame with sides 18 cm. A uw*.7m )ub ydtiniform 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 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 tf6ev kq-bv hn 8m)f,/yurns 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 and3 jgz;ama4wvtj,mel+nh yb f3a/37 ;l 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)7 re arqgq;tocn, -8y a location where the downward component of the Earth's magnetic q),8otyre; ranq7c-g 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 velocityo5rhy )( .gc0ggrfi0w of 2.0 rad/s about a vertical axis through one of itroch50f )w.gg g(0riy s 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 crojlt ay9v,5+* niy;y gl23) tuvfa.ukr b7c)t lss-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 t ):vs2 8p z0owuybp:paurns 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-wyy/r2w3k k,aa )ttn loop is 12 cm long and 8 /,ykrana ww )y2t k3t-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 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 of0luyw5 uiqil; g659nh 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 t oqpntm :5d.4g.i6 ynso construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ar pqg6. o5ytndn. is4:mea 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 lz qlw /3m6f+uhy3 7xwa 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 motor0w ho sn8w -cv,6q*xjt have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesv.1a3ahu- n l)ac fgo0r,d:x ako by26 on 120 V AC,b.vkou-xadorl gnc2)aa 01h: a y36 ,f 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 internal resistancej -.m-i*)rhm+mkg u xe 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whgm.h*jrk mm-xi-e u +)at is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V po mm6mdh y0s 9t6ybz-;uwer supply. The operating current is 1.0 A at z 6mhy960d b ;ytsmu-mfull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup /8y. z*xpqujl koim4+ply. The operating cu /+oz4l.yxm8ku ipj*qrrent 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 reduced-x. t1x kcpimf5*s62h k(een(e gin8 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 14 A toarjqv-,yoou u c g/j86tk2: d5 flow in the secondary. How many turkuoo- jq2g y atdur/cv5:,86j ns 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 thk-q9 ud7znu7u e 24-V seconda97dn z-u uku7qry 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-turn secondae nww;-j7) cpgry coil. If the current in the secondary is 3.0 A, what is the cucjw- pw7e;g)n rrent 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 primaru8sba nhi 28,fi,4q usy of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the huu8,s ,qsai 24b8inf secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer pr1h q))vqcmlw /ovides 7500 V at 10.0 mA. The primary coil operates onq w1m/ql)) cvh 120 V. 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 i a*vppqse/ u67 (a lgo:mu33azts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present/q(ve og3u*a3:pusa7 almz p6 in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on i-e:g2g0b/ravdf c z+ pts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curfa/gd0 e-z2gr :+p vcbrent 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 secob5)3fmhq mr8r7pc t *hndary has 200 turns. If the input cprm cr3h8*fm)7bt5q hurrent at the 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 turns and its secondary has 200 tu.i,qnhwf d iu6 62-gv/if; aaurns. If the input voltage to the primary is 100 V, we can exp i/ u;aq.f2,-if 6advunw6hgiect 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 200 t6 sc oc fe+xxb+k2mv5t ;p,*cfurns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecticp f+ ob,6t;xcm* xf+5 ec2vksng 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 (fkn;db t6j t4stepped up to 4500 V by a transfor ktj(4d6bnt f;mer 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 voltage is u6n w5yz ls 48 +cx4mky8gqbys1e + yt*c;vi-rnsually stepped up to 4500 V 1-gx+nmqvs4 iyely y+cn65r sw8kc4 y8t *;zbby 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 producesl3 jat( soon m(48gz5y 60 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 power lost in the transmission liys( tjgo4(35 oam n8lzne 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..4ci62drzaf a 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 2fdcri4za .a6 of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generur jw js25x4q 6kqtv3m6hp68latohrwx v3 jj l56qs6m8p6k4u tq2r 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 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(7wysrwv,7)cn qnz n 4 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of (wy7n,rnzvc4 )q7 wsnat 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmiy8 1dw/f7 ojtxtted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original po817 /xftjwyod wer?

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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 coipvc7wj au)4 f5dfw ,(pl's magnetic(w)p 7f wc dp5v4ujaf, 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 resistorv8 fxfyo3 be00h* tf1u and an 18-H inductor. What is this circuit's time consoxuv fb00* 1h3feyt8ftant?

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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 volthd 2-en2 *6ndiv dfh-kage in 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 8nakk) *wryde55dn(g 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 placedok(elxzve e/q06,v iv:zzm): into a 120-V AC outlet. What is the resistance of the lamp?6 ,:vzzeqme/:o ek0iz vvx()l

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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 z5slysrcy hj9z.y0wz0 (v- ,iop,8e xpower supply. What is the peak current through the rri, ezovs89.yy5 cx-zl sy ,pj0w0(hzesistor?

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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 aqv3 a-eb6i m0v 120-V ac power supply. What is the power dissipated in the resi0-vqim b6e a3vstor?

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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 is bhcep90ulg z19)np s noc0(f7 $I = 0.80 \sin (240 t)$. 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-Wsq,+ (5 n 8(rn1.kfj dkrsljukriu0s 9 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 yp7yuhm4 el0* 50-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 x94g u6/xoyl fa 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-qbv:3qznh.2zy, hju 3mH 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 intbv+uj+yzqxxm( e;e:;d 8f-sductive 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 inducti,cv5nw km: tr0zqom u2)ln/ :gve reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductord1 op2ptlr,6l when 120 V AC at a frequency of 20 kHz is applied tplp26l1 ,dtroo 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-mHdx5 a.cy.r7l ladfr4 ( 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 kHzx.gjuv 03;;ee n 2txuq?

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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 qql;jo(u:)0k y*p tu mat 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 coqt pglu ek,:f 3*)j6xapacitor 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 0.010-mF capacitor be 100gniq n+j gnrf)- 7*s1fbye;9m W?)yebns+q f-ni frn*gg7m; 19j

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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-mFxf*ufd hq.p87-cxdg( capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit ptwhh:zyt:f71h ) 1k ,r9tji jwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive r,91ztw 7fyth jp1 rh:t)ikh: jeactance?

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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 m w21 g,po:wujr7t5rf1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sp5 2ugfw:7m ro,t1wjr eries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 200,y0k2;z ors-c v f,thxxf-ak-mH coil, and 1.0-mF capayt 2cxhvo z-fr0,k x,;0-as kfcitor 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-m6 xd/md3 m2j;q(lo,/ggcma6n g ist g)H inductor, what is the impedancej cdn;q,glmtm2(6/dxg/ ggs3i6ao ) m at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connmtfuh6-g fzj)w q60g n/*k0ybected in series with a 20-mH inductor, what is the phase anz0 fwth*y0fgg qb 6 km-/j)u6ngle 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-mjjpt+u **3)euf9ucf qH coil and 1.0-mF capacitor for a to9u 3upejj )f t*c+*ufqtal 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 nri,o0lpmz 15 needed in series with a 100-W resistor and 15-mH conmi ,0plzro15il to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be 8o7 un3s em7wif9fx1-i bw0dzput in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W3 x nfi-77u8w bme s0ow9zdfi1?

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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 yb fso.1i ft56series with a 100-kW resistor at 1.0-MHz for a total15 fsot.i6fb y impedance 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 r(:r vw+ky)ofha 6. e/hhymk)a 20-mF capacitor. What is the impedance fho:k/h yk6 v.y)+)rrmwh (aeat 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 wit/aogqz9.9x nvh a 10-mF capacitor at 1.0 kHz for a total g vq.n9zx/oa9 impedance 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 5z so(mb8poca 8qvp21l-rz l 3a 10-mF capacitor at 1.0 kHz for a phas 5 8p(bop2 q8 l13l-azrsmczove angle 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 resgv p7.1p*gmmwi h3gi4istor at 1.0 kHz for a total impe4p3g 1vgm ip*i. mwhg7dance 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 100fp( +t*ioa xi6)b-)x bavf)g q-mF capacitor at 120 Hz. What is the phase ivax)b) f-*o6a)x piqg+b f(tangle?

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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)fe, a r*bb1xw 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connebrwx1f e,a )b*cted 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 1gbz/wr+a .j ot3wn:o1v6 ;sch00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The cign:+ / 6jvhoawzbw1cr; s .to3rcuit 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 reactanx6aqf1 sh*h8 qqrc*3hce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sour1q*hqaf38 x ch *qh6srce. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a sbff/.x s yj,-oeries RLC circuit containing a 50-W resistor, a 10-mF capacitofb-o , .xysfj/r, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serie atme-coh+;,jf f/uj(7 n;maes with a 500-W resistor for a phase angle o7 - of mmajhef tenc/,a+;u;(jf $40^{\circ}$ 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, i q04jz( dsp,(hb,lfeL = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferre ,4sf ( zqjeb(dlp0h,id 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 outp9k6ta4)r8oczb k3c8g,o/cy i ttdl h+(5bq q xut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitit gq9d83xlyo5,kk6 ca cr4o bqh( b/)8 zct+itve reactance, when 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 circu05hw(s3f/ntdr 4;,l vartz*fc e w hj+it 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 imped900c uwjf(/k tiaam4oance of 60 W and a resistance of 30 W. What is the powuowmja c(9i4fa0 /0kter 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 slyp ib--r;iabb) /je. eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, andlbebi/ybj-r -.; )aip a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in sxgp )c+pn(h ;.o h0szteries?hosh zgx0+c.tp ()n;p

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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 x2pbej9kibhp4f;t s r1)x/ +tin series with a 4.7-mF capacitor for a resonant freque k9p2tb4p+)1ersx ;if xbh tj/ncy 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 seru 7i8t8jyonioyw czwhy 3x o)2( fm44,ies with a 3.7-mH inductor for a resonant frequency of 10o iif8 mo3ynu4 wwtzy)c( o247j8x y,h00 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 mu8vtd*.*,ugdhl + br+a y/ kbtnst be placed in series with a 30-W resistor and a 40-mH coil if thyrt*.,uta / d*nvgb+dhb+l8k e resonant frequency of the circuit is to be 1000 Hz?

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