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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 flux eqcmi08h+qc32r0 jrj h5c0 te 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+g; 8xy)07qdraponzg states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind ov;riv6 7/jw pkf change on the ivip r7k6wj;v /nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wiytrnyp r+)lv)w3t; ) t( vxm4wre produces what kinlnvy3trrtv )wxw) +; y()t4mpd 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 owj-8pbi qprafo kvag83z3 z:8m;x 39sf wire produces what kind of change on the inducgz:9jaoapmq x8r;3-ivw38 s k8 f pz3bed $emf$, 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 alanlr+x4v ju l.,*ize61l 7zt 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 l e5lv-g5(b beeaw, the direction of an induced current in a conductor will beb l5(g5-ee vbe that which tends 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 table. A bar ma,uo m1aw(*o ehlfu: 4ngnet is held above its center with its north pole o1 :m(l*o ,fnu4ueahw 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 flat on a horizontal table. A bar magnet is held ab s9b54zjcy a80ra sdv (h-f:zzove its center with its north pole pointing down, and released. As it approaches the coil, the falling m( zz4va0a 8bys:dr9s-zj cfh5agnet 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 regio ajwv;pc((hy0n where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed f0j( w(;yavc phrom 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 vwwo w(-/p z1e)xmfstmi3 zy//ector 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 field incriztwm(m fs wpyxw/) / 1oez-/3eases?

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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 wheajb3p5)s)o7t j. br+/xs g hvwc5+5egueev x7re the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what +)oh7 +g/uba5px j5g7er3wtse c.b vjx) sev5is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carrietiz5)qkp+u6jn4k a( ys an ever-increasing current northward. Two j 5z iuy)kn4 +tpa(kq6coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north polu /owm9 a2zn z**y n+;e*fcpole entering first. As the north pole enters the wire, the induced current wi 2umoca9+op*yz l *f;wen *zn/ll 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 angu:mk)q*n4 2t*.q tl0 iso pl6m 7cfhrlxlar speed about an axis whose direction cammr*l xp*)t:i4ohsk7n l.2 0c6f qqlt n 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 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 constant anguv7q, 9ir/ujq8b) vhuo: k5bn alar 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 t,ojuqiq /b)un: 58 rav kh9vb7he 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.j kn6gi/vf itckiga6 904*e, y
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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 any4nc12 l0lsyx $emf$ 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 a4bo/bdc f 7l2 3hc,got 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 northward at cq;q2 x 4)6gkddtq jig/opjsjrz2/y2 :onstant velocity through a magnetic field that points straight down. Ma2gqskrdtyio6dq/jpjjxq4 / 2 zg :; )2ke 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 rob0 g 6d7q)k3kmth5tdqtates 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 t6muf,0g h0jdfi h 2xh.ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutionvg4mn n:lw le) lke97)s each second. The frequency of thwgnn7el )4el9 :lmk)v e $emf$ 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 devicec0rtp)zle3 -fw2tdq ( used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tf8sv(-g7v-ol,v(8zcnv hw jphat

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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 mod l mn(vn5q;g9eojbb+n*6hihy+qn ; k6/p5vfre loops than the primary coil then it (6lng+kh 9do bbe;5vq p*m; j/fvnn hni5q6y +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 co+/w 8jm/t3twh+bl wxf il then it 8f +mt wb/w/h3jtlwx+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 power inputj/vf k 2y)d;iz4hrw c8h7 n.hb

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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 cii;sqw0 aw 6bo3:wqv(s rcuit,

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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 cy (g+kaut. 2hideal battery of constant terminal voltage. At the .c (uyh akg2t+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 series to an ideal battery of cohy-r im kea7jc-b*;x/nstant terminal voltage./-bihmyx kc -j;ra*e7 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 con1aydxegtt xg)x)e- vdv)2 :+wnected 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 isv5,,)byr0cm fvx gto+0x:p hy 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 bi53 .v ;g 8qynt3rm5t zbz10pna gt;lconnected in series to a battery. The time constant for the circuit represents the time required fort 5qbt.yig5;1v833z tprlazbm;0 n ng 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 serie1p8f tyuq( rs*s to a battery. The battery is suddenly removed from the circuit. The time constant for of t8( yrsf1ut*p qhe 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 same9,rk qdf9j+lg units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supplyxj0/8n 2htesl;:4j: rangl j5wk ;itj. 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. In9b k+;832hhwy dp2fdicb wk8 n this circuit, the current 9d 23cdbwpyk2 hi f8+8nhk;wb

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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 a9zdeec + 1h2eon ac circuit changes by what factor when the frequency is triplecde1e2 e9o h+zd?

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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 e6 i rrycpa4y q+m;-a)the AC voltage across an inductor is doubled, the inductive reactance of th-r;yr+6aaepy4 iqmc) at 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 anqso3 wb: ; yzi3ncma3)0 b/8rfb1qsan inductor approaches zero, the inductive reactance of th 3 8zn:a 3a wc0ybfq)qssbmrn1b/i ;3oat 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, (l v-6b)oha bv64zdw. bx( mmlthe curre (-6hmv xl4o(.wa6)bmb dl zbvnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the freqk: esn jt) 1.)drk6ibjuency is triprkjj 1dt.e b )k)6:sinled?

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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 approaches87 mgylo ejm1+ zero, the capacitive reactance of that capacit+o1glmj e y78mor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a5jhn9 5:/m9qsefjkq( f +gswx RLC series circuitn 95s(/ sjj5q:9xfgf+kqw ehm?

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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 RL3u f fvx 7xjdrk5+i( ri;c(bu-C circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedao*e7g*(y j1r s pg2omge6 yp7tnce of the circuit increases if R increases. When is thi ryj7(g2es1 t e6ypgo7**m gpos statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of thfr:6hg )8i pqfe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cih2i1tt(ze ;t 3r1dd iqrcuit 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 cas7,:;*r6htd2 lm(jb o9cycad baeqb6pacitance both double in an LRC series circuit, the resob c:ajsbdd96 6 ebm(chq*a ;to,l27ry nant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vo7fo(8jlhw 2+: fm-fgrfrj2i jltage. 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 circuitp oh, -2kdhyc63qxe8m89pozn 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 muapz0rmf /3wjp8 +.d( y 3gx;*jizd tv is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the .(0/xr33 *;t dvjwzd z au8jmgpfi+ypplane 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 magnetic field of *gxl*rvixl4p ihb tsw8 r+623)d eg k+0.20 T. brrg) k8vxdt+* le2 6p hg3is+x4w*ilFind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 mn 8nhezln*78a 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 788l an* nznhemagnetic 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 singl11,r1jjoe( *on nfm lpe 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 cam(;(kt.k b okreu 4)z*l :y2v3 ipkychanges 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 turg;a nti: 4xuc:zcf:s; ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field c tu a cx:nc4::;gsf;izhanges 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 turns and anhy340i15pk h2 luw/csj9om ks 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 a4ikviy3.9qpb wl*q1 i0jev 3lnd 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 locu4(n3qto s3/vch;ht:m/ odpl ation where the downward component of the Earth's magnepl oq(h:/hm/n43 vu;ot 3cstdtic 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 1 ,dk/)nql lyip 5/zkgangular velocity of 2.0 rad/s about a vertical axis throu k p)kldz/y/1,iqn5glgh 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 loopsim asdo6/ 3k 3*3+sjc)sr(bbc:ii acj 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 consiststubu r7; tz5a9 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 rectaauuuzc.sh3 58c,l4ej ngular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, wh 3ac8uu4e 5lz,.jcs uhat 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 o rdio2vb/3x3kf ino 7)qs5k+fr3tf7 gf 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 c mjti 9+2xluu4onstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnj4tl+i2 u9mxuetic 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 w j v05.xa8*rb+rciitg;78ivbeb/ l srith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mo xoee mnmk1c 2fc 2 w26eu*8svx+ezj,(tor 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 operates 3n+sk-zru 2ms cr6k 7qon 120 V AC, and when runningc+6n k-kmz32r r q7uss at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6zdxpp(mz9lk98 u t s/+.0 W is connected to a 24-V power supply. The os(kztz m 9/pxu9l +8dpperating current 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 resistanc+ ato* j,crko5lf )lxdo69*d/2o9 cov1af wbhe 6.0 W is connected to a 24-V power supply. The operatinol9v do *ow 1d9f6okaac/)2bo5 jxtr f*l+h,cg current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rcjw)4 dhy+ 9,1nq xjqsesistance 6.0 W is connected to a 24-V power supply. The operating qwhys j4 +jc xnq1),d9current 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 i,lcg (q tayi15s 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 1ybw/b b7ccz+n+3l1c/ u f w qt618d.7yyvi qvu4 A to flow in the secondary. 87+ 3 wy+cb/dtu7/1 vcf. wq 1uyncqzviy6lbbHow many turns 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 prl.j .+ypqgn(pk h5 a)sr5 th9ximary if the 24-V secondary has 100 turns nh.)5 h(g.xp+5jptykqr ls9a?

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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 col;f6 co08zz 0b+zmvrril and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prmvz;00ozr6br z+8fl c imary?

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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 83ba.xctt-nma x4;udw1 ry 2si-7x huof a transformer. Assuming 100% efficiency, how many t13xa 7sn adxmcitux;8b .w4h 2y--uramps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at cs*e9is jr )z*10.0 mA. The primary coil opz ij*c* )r9sseerates on 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 its primary coil and 300 turns odk/vxt.w-m*x6 l d ux2n its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage ix /dtx6 .-kmux vw*ld2s 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 turn vai0m1b:x eo4s 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 is present ia0v ebomi:x41n 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 secerzgbnxp)) 4k fi :tf* 8h9;qy/g zph)ondary has 200 turns. If the input current at the primary is 100 A, we can 8n h q);/:)yg4 prtgfz*kxhi z)b9efpexpect 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 trans9bx-- pcyfm 1dformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be-1py -xmcd9 fb

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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 ha+ 1j *rm,jgk h/pto3hhs 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to bm hg o,hp/+1j3t*r hkje (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.kk:a :s5pt.mi kr)le rf ;haei25k-h/ 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 number of turns in : kier ahifs2)hk;5emr :tkp/-5 ka.lthe 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 Asud r-i0xd)*m2t xay2lk l,f2.hy cg* of current at 120 V. The voltage is usually stepped up to 4500 V by a transform*-d2xyay .lrmi)f 2tx gk*,sl02 hcduer 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 60 A of current at 120 V. The voltage is usually stcbyek 4b8:k 3l/acky9epped up to 4500 V by a transformer and transmitted through a power line of total r8k3y4:/le 9b akbcyck esistance 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 total5 gyfw gtr,*e, resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lo,g*tg5,fe wyr ss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were 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 generaasjq8; 6 jeu5xtor 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 transfsj8 xe au5;jq6ormer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lpvyi .gk/4 81r)jwf gfr/llg8 ess power would be lost if the p/iwg .vlr84yg 8 pj/lfrf g)1kower 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 qqgi. ) v jzla)q zvp;n7/2c8;hsm 4ikV at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output4.7v 8a)q2p qgis h mcinvzzjkl; )q;/ be stepped up with a transformer 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 5wl+zf m-d dti,d,6p3r.0 A. How much energy is stored in the coil,d 3tdr,f- +zmwp6ldi's magnetic 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 4vw ,c(ss 0hmcmpf92gxi2ws* and an 18-H inductor. What is this circuit's time c94s s ,xwgv mspwhf2(2c *cmi0onstant?

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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 rmskap t+9)lp dg04s dv3p 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 cuj v ekk+-,t9xfrrent?

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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 intrij* y- tsicc lz:90;io a 120-V AC outlet. What is the resistance of the lampsc :-rctiy90*z ij;il?

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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 peaae erkaeeh c56lc* 12.k current thecc12rh.l* 6ee a5 ekarough 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 120-V ac power supply. What ldn *cg.x hm0kl6+ rahr/, 9w2rgpo9 nis the power dissipated in the resiw+ *nkd9plg rl9g. /x26nao0rch,hr mstor?

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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 resii,3;nol;;b9: yiwli bm f(cku stor 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 resistor isu1ovmcvpg v,a1 3cu- ( d livecuk-+-7 $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor il3t:em2n- 6boqt7l dds $I = 0.80 \sin (240 t)$. 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 indi5c7 mb emytk4; hqt47uctor 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 2g vo s6t 79p)kgx)uhl;.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 induct9sa7/sfaowg4d: hjcqv:r3g/, 0 gtx sive 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 nju i)+cetb)j 8j- b,awecessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency( royvg6v r rczy65-sn n(ca1) of 20 kHz is appliedrog ryscz5r(na( vc-)16n6 vy 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 110c:z 7og.w);bwn riwx7-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 9u x6r2y o v4hrhtml:57)cxcdzz0a n- 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 capacitive 7dv.f--wyqg b1zayl ,reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor havq 3 nhty3eg;w7e 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 capac 0qfhu,f: beuhl 3o8 s9q.lql4itive reactance of a 0.010-mF capacitor be 100 Wbh0,f4u u98. l qslo3lf hqqe:?

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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 capacitoin74. i ha:cd2p7ze jur 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 ac9shw3f7b)bz y,s da4 rbmv2)y series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10sf3ab 9)4yw7zs) dv mb2hby r,.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 108gzx)m 5g5jn4gr sq s 6hbo,9h.r0oal 0-W resistor, 20-mH coil, and 1.0-mF capa4rm.qgrah8lgs) ,goon0bj 5 69s hz x5citor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz j0 8,dljxkb*mif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriebm*lk x,80 djjs?

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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 ive7, kcss8 c n/a(y1 mcswg1(hs connected in series with a 20-mH inductor, what is the impedancehk1/s(1 e ccyns ,acmgv78sw( at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what irov 2fj-+5wakickrb(v s b8+7 s the phase angle at 10wks5+-vaib+r8oc(27r bv j k f00 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 capa khirhjq/k.6+ citor for a total impedance of 16/k k+iq.hhjr 00 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 sercfx 9i5v(yf 8*l aslg,ies with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 x5avcy(gl*f9l8,f s i Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH i yu0g uemo9e.3nductor at 5000 Hz for a total impeduo. y um93ge0eance 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 with a 100-kW resistoa7 )fa6pcr0w gr at 1.0-MHz for a total impedance of 150 pwaf)0 ga7cr6 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 is the imp 1-*i 4sj/hw8j13+puex lfjp ,c ttckqedance atwpjct/*f pxhsjq u,48 c 1lkj3t+-i1e 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 kHza0ez c/ ove.;i for a total impedev/;eo c ai0z.ance 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.7 cz3w 1 z.swwn3-wvrw cv+rt with a 10-mF capacitor at 1.0 kHz for a phase anr.vw33 s z-1zw. tcnwv7rcww+gle 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 1.0 kH;s6b bjp)joa/ 2 lx/ypz for a total impedanc xpsb;j6o 2/ay/j) pble 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 6nt52tf* +n fr7 rxihl)9 pb3yqwthy xmz.; (d100-mF capacitor at 120 Hz. What is the phas2mfy;z wt3 *y rdx+fh6 5np)7tnqbt r.h9xl(ie 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 an 4tb+oo-a2k 3z+izjt rd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedok2rz-t 3+ jtboa+i4z 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 capacitor, and a 0.8cdxygf) kkrmr;32 cesj a*rrk8* 6 n2350-H inductor. The circuit xk r y d*c 6kr)f83m2*crrne gk2;sja8is 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 capacitvbzf( p (45smkajp(m7or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in t5sfm7v m( zkpb((a4j phis circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resdxeqty95e5 ,zx ++iyhistor, a 10-mF capacitor, and a 0x5 dx, ey+ 9+5ihqtzye.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.bp11jpb:ko b/yj2r m 35yhnf 500-W resistor for a phase angle o b3yy:j5po .f h1m2npr 1bk/jbf $40^{\circ}$ 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, Co5,x;ewh igmd,yq3t (jo- w/ q = 10.0 mF. At what frequency should the circuit be driven in e gq,dw -j5xi/3ymwh;t(,o qo order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 Wdqt* b.txo 2.i inductive reactance, and 10.0 W capacitive reactance,qtbxdo.. it 2* 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 bix; 4z b0h fo.05stcbcircuit 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 resist+ufjo0uj7la 5ance of 30 W. What is the power fact f75jauj+0oul or?

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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 forjc.syz68l qns- v 9i9x a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to6 cij998y-xn.ssq vlz 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 fr 0hvn5z j8pg*uequency of a 1.0-mF capacitor and a 15-mH coil in series?50jngz uhp* v8

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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 ,f uimygd/b56 boa/ lxd*6jg4 a resonant frequency o/jadlgyu4x* f 6/i,ob 5 mb6gdf 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 resonant f hgfbxohf i1guz..c5 8vy8)6q(sv8ozrequency o51 z.g.hx(8i8fq b )yzo8v6cvufosgh f 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 w/g6u:jvf wi- and a 40-mH coil if the resonant frequv-6w/j uf gwi:ency of the circuit is to be 1000 Hz?

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