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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 .i ic d+iboy58tz-5mt units 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 induction2k0-qbz rs u7a d*o5nx 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 k,vdq2( eaij k:a;j ,tv 8dr rqg,ukz10ind of change on the induziq r(,t:rg0uk,2 vkv a8 d ;1eq,jjdaced $emf$, 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 magneticge1)h))qrneol q rn+2/ki/xk field through a loop of wire produces what kind of change on the induce1//lgxeqkrk2qe h +)n )i)n ord $emf$, 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 cc/q+p i y ;+ss3zlda6of wire produces what kind of change on the inducedlqz;cypa36/ds + ic+s $emf$, 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 frakp),*n mc; ftom a 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 directiont7 xq9ma5c k)gcu/ppl(g8jywbx9 o/ u; 0re;v of an induced current in a conductor will be that which tends to c9g jkuwm7lxp/x b0 qa) 95/rvoy ;p(uect;g8 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 magnet isjtv9p3gp6 tme il9: 9k held above its center with its north pole pointing down. The stationary magnet induces (when vp 9l3jg9 mt 6vtp:kie9iewed 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.jj4z 6;d.d ana A bar magnet is held above its center with its north pole pointing down, and releas janzdad4. j6;ed. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top yfxdw2/f+x g:.bbq( (iftx( r in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced 2(:id (+yf /.qrwbxx xtfgf( bcurrent 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 veo5 f.v3drdig :u k2c3octor points straight up. The magnetic field suddenly grows stronger. Wherfk vo3d:3 ug2oc id.5n 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 regioduv)erzwl29kjv 2-y8e-o6kb *ps :odn where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current i2:j2wkysobvel*)dpr-k96 u z-o 8 dven 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 horizont)y* ag;bqa a,ukp. *oial table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, i*uy, ka.a)* opqb; gathe 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 enternn1hns11mwvf z;b b07 b8t3wbing first. As the north pole enters the wire, the induced cb;8 bvbw0s1b 1fnm17 nhn3twzurrent 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 consta2go8 + rk y.l7vdbg;+n ffn*ybnt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w72gnfvdg +yyk+8 *bnfl.rb;o hat 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 angular speed about an awx kn 5g:tq0z.cvn(3 6aheh4dxis whose direction can be varied. ha4k6qx50 vwtn g hn:.3dzce(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 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.n8kdpz jbv6/7 vqcn0 )
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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 ) )j e +l3hb0ad5ycj*qr(8.ikkhdf ge $emf$ 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. The : 6x fa7z:e(:3x yc:vtxahwv i$emf$ 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 ii-9-a :va ug xq5f5bvpn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a state 5a95-: qvb gxpa-ivufment 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 rotates at a constant angular vec7vjx25pfq hl5g1 ixs8a99e glocity $\omega$ 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 generatoz ztcb3yvjo 29d1.i.w r transforms

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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 sercwr5x9kal 31 r b6( f.gvxfktmr+;2ccond. The frequency of the lvark6c( tx3k 1 f2 5rr fgcx;w+.mr9b$emf$ 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 uikq+q/-t-yev 4s j;uused 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 devbel cptd7a9ezxz -c:-jk;zw na)25 6 jice 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 tqxmyfy r-+-)yi,artl1 .d6 sghan the primary coil - 6yti+-yfq r ,)s.mlxg 1darythen 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 turcwnbug i3w 56*vfq.g n9 b67he primary coil contains more loops than the secondary coil then itr3ngf*qb6i5u96u nwvc 7 g.bw 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 inpu-y(taklz d/3cc )ebgnaq)c) p;ir .1 st

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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 5ge/lphf x0b2 circuit,

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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 + u1wg lxnm(/kgz.yi4 of constant terminal voltage. 1mgukxz.(i /gyln w +4 At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conne-hyzvd15wr+p w hz6, ected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battz5-wwy6z,epv rh +d h1ery, 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 connsh+pi,a3/ zgb xhuql6 0sos-:ected 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 reshx/x ozx.yn3s,5-nzg h:u-u mistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The m5 4qcs 9(o(cdyeu +edtime constant forc4 dc 5ydoqms e9u((e+ 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 inductor are connected in series to a/.jh d)bvte 6q(kz*l :ry7kg -ce1eio battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for:-7gh o/1)ekckjqdy.ei*v r(l6eb t z 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 hr- gi,(g 9/aifrr4ko,txe i9xave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to oo:axn372dbwjxzn45aq wu7 5an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. *m x9:vcuch w5In this circuit, the currenucv *m:c9w h5xt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancek (enc1v/w. b+lwfvl,gtxa 7 w2p(3 fd in an ac circuit changes by what factor when the frequency i +c/w 3g,dwavnp1ebwfvklx. (f t7 l2(s 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 doubleqqc 65r13 qr qweah:zn95lue 9d, the inductive reactance of tw3cq9nu1q65 e9 q 5re lqzh:rahat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ieu+tbch: kf/ :nductor approaches zero, the inductive reactance :f hkub:e/t c+of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In ; (uj1frc2a1hy-ha-bm3l.ka dev lv 4this circuit, the curren1 b-h2 ;1 mauj43evalvkdlrf-.cy (aht

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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 whe4op(4u xdel7;q xu-nln the frequency is ( u7lpeodxx 4-4qnu;l 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 vol4nhpw33lj l +iuv5) jftage across a capacitor approaches zero, the capacitive h 53unf)ll43vj j wp+ireactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the indumzw k7(52jvg c1gmem 3ctor and capacitor in a RLC series ci1mezgw k72(3v gc m5jmrcuit?

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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 define 3aq5i8eljhq5+q k tm+d 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 pi-amzwu ;g-/ os),nrcircuit increases if R increases. When iisn;/-o p)gar -muwz,s 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 impqkq dctej a*-k, 4v;4cedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit m njaj9* ,-yrmuouh,:hwu+5zincreases 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 doubleiw;x2jouf:rklx/d 6zya r-2 ; in an LRC series circuit, the resonant fre; li26r;2ad yr fjo-x k:zx/uwquency 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 bm(9j(r l+ix t9c +/prntm0 9bebf; cuby 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.yfbgrbk8y q hb108 u) RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor(onde7p59 s e wypl)vqzp9,*ki gui)9 m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector areep ni79v5 ()ik)p slyqdp*zg9w,ue9o 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 aen 544.kfwy wk uniform magnetic field of 0.20 T. Fik.ke4w5n w yf4nd 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 m is rotating ix u//)t zoci6f w1i.qmn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiw1).m6iuqco/tf/i x zeld vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from ia4 .mzy,:qjl $1.0 \; m^{2}$ 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 frt djcjxz3a2n4r r 2q.899irenom $4.0 \times 10^{-5} \; Wb$ 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 wilal9 y,-epwb5 th 200 turns 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 changes uniformly from 0.50 T to 0 in 8.0 s, find 95pl ela w-,bythe 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(m:5wvfz e- b*0o komn 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 h/9 b7oz qi(fl/wp:pgand 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 locap 7+2lx jew5c(j p65j2f9opj vc 88ya7yhhtadtion where the downward component of thwjhh6y 8 9j ey2(pp 5lvo a5+tf77j8dc cpxja2e Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulakbjq)f gg3 3w9)c4n*it5z fknr velocity of )kfq9 *g j n335nbzfw)g4ck it2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a7 ewz9+zqqghg8b m-7npb+k x) 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 of area ixxi6:ehm1w/:0 21rx hiq6xoh nijm7$0.090 \; m^{2}$ 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 eg/7 ac3d0ycvz nv-d/its armature. Each loop is 12 cm long and 8 cm wide. The armature rotatz7 -vc0e/nvad yg/ cd3es 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 of wire of arowtby8 :.n f+kea $0.090 \; m^{2}$ 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 to7u-kflsu; xdfc*h+h: construct a simple AC generator with an output of 12 V maximum when rotatcxfs+fdh-l:u7; hu *ked at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gener-gm(m jy 00t,mcxbz5mator with 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 6.0 a cfvrwu)l:d:0db3c70 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 re/wggujdu a+z1k4zb 7:xyt:/xsistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a backz:/k gd zau wb/gx4x+1:ju7 yt $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connect..6v2ny jso v 5-dsvh f7li:myed to a 24-V power supply. The operasyd2vfh6 5jol-vv. .sny :im 7ting 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 resistance 6.0 W ispy *ujgn*1 ,js)iav4 xte+f0p connected to a 24-V power supply. The operating c)fxt *j,gs4e1*apj pu in+0vyurrent 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 resistance 6.0 W is connected to a g i3l miqxpx0 c16+-5cgv9 hza24-V power supply. The operating current is 1.0 A at full speedp 69ihmxx+qga1 vczg3ic-50l. 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 transformerhz-e + x59wt(l- clfpi is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of 4 b0p(qe ;:hix)creqk3i,ct ca transformer causes 14 A to flow in the secondp4c it:x(qq, heck );e rb3i0cary. How 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 turnlg+xmx7h *:xeub x, k3s are necessary in a 110-V primary if the 24-V secondary has 1 +xx gb*k3xhmlu: ex,700 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 cz*m)a,pdkl)rmuq jhs9;)z, secondary coil. If the current in the secondary is 3.0 A, what is the current in c hdm)* zm,su9;jz )pka)rl,qthe 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 transformer.e5yers wtry,aciy t/2y, v q5,**e *tm Assuming 100% efficiency, ye,vcq*t, ey*2t5wrrm,e/* a y5ys ithow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA.czfa92u t w0.zb 9kv(n The primary coil operates on 120tkwn9v.z9au(0 b2 cf z 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 on its s8bq/b /n.1yglk (oze j cv9a)0xo.csxecondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary/e)ab9z xg l/x.b .ncvoq(ko08 1jsyc?

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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 its primary coil and 300 turns on its sey9flotegyg131 4xx v ddca73+condary coil. If 120 V at 2.0 A is applied to the primary, wh39+gcf xda1v4lx 7 yd1ty3eo gat 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 t2 lnsd2)q6xox ka0x7d 3 3kzmg kia.0100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at )lx xt3oga7kqskx0 .zm3220d6ai dkn 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 secondary7v/i hxlc ;dl. has 200 turns. If the inpl /l.x; dhcv7iut voltage to the primary is 100 V, we can expect 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 turn+ik9nu+5dy7rqw 22o n)wan c wk2uh.ws. If the power input to the primary is 100 W, we can expect the power output of the secondarynku+7 adur wnok 5.2w2)qc ny+wih9w2 to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volu rqu :kqr rf5un(q113tage 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 the 3qf1 r:r( kuru1u5 qnqsecondary 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 curret hb*an2wi; d7/i5a8s l1rxinvg ) vt6nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted th85rxibv7htw2 i1n);aldg / v na6ist*rough 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 cjm kj7 d kwny9v0 1v .zlh3-nt27j5fkqurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmittk 0-7k zj7y.t29lvqnhmd3jnv jw5k f 1ed through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a ton8uz 1 i8ovx-etal 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 vno8z ux-ei18 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 lxvancwq3(jog w1o+ 9j z8 5bqa(1rfx(ine 50 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 v((fq 5 xzwr+ow 9gxao3v q1 18j(bnajcoltage 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 1000 V. How much less power would (;(aplcd*.ebh *4rztn imx 2qg 1sr.r be lost if the power were transmitte1b(* a. pxi.det4rrg2 ;h*(nzscrlm qd 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 i8vuf 2o/f)mu suxu63*ka1kvrs 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 transformer if the power loss in truu/ x8*ka)k uf1rvov 2m6s3uf ansmission 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 energn(cogf1 u t0(qy is stored in the coilc n(0ft1u ogq('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 and an 18-H inductor. Whpx :, xicki/ohys;yn 6:+1:lac tx51 9ewvbk rat is this circuit's time constantycib x1ikca5kx n1tov69/x: hp:,;:y rel+ws?

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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 jf8nl,( +ypg3 ycq/vhrms 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 iwk0gi,in pftx+k 76:n nto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the nnp;,g 8kim8vil6v e(lampei(k lin;v8gm8 ,v n6p?

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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 sloi m.65v2qu9org uq-uh ,o9kov5mbd8 l2g *-V ac power supply. What is the peak currevrsk 2m2ql6 9b9,8 i dq umho5guolg5uo-o*v.nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W t2a(a 8rt.eqdhat is the power dissipated in theta2 (d.tarq8 e resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto9cx*f5wpnov 56n 3y4qv scdc 5r 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-y zn3fh lrm:-uv, 0q;gW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iskdijn29/kotq0,k)h nb90( l4 bnw lvs $I = 0.80 \sin (240 t)$. 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 induao) 9fqg/qdncjz p 43ho1f)o3.m*kjk ctor 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 1000 Hz?l(nydq/rz6y (,9us .fka vzz6

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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 inductive rece 3.y6))cvymd p.t ah; td/iqvmz91w actance?

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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 rea6llhq71 +o e 01-asgiwks4mjlctance 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 frequencly xb2.t +joim4; o; gwgxr:v(1csov upc1.x 1y of 20 kHz is applied g xmg c 2:.o1v4ou+r;p.x wsyot;cb( vix 11ljto 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 2.5tw9qyfssz43v) g+x 2lcc .*hn0-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 cic 1j9 bv m6b*bkw.-+gn hzdw5apacitor 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 capacitiv5vq epoe) )78ba,kcs ue 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 cap k*-:cwy;tktyf/zwa p5 l(rvsh,bs 79 acitor 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 qgj6.ydlc5,: j8tlq b 0.010-mF capacitor be 100 W?:dqtjj. 6 ,8cyllb5gq

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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 capacit+ ;f,cq 9f*bggqne i7cor 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 with 12.0 W resistance, 15.0 W 9v3 n)me)pqa f i4rjx.inde)axj 4mp .f9ri3nqv)uctive reactance, 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 100-W resjcm p/93 ts3q(1rrdsmxpq.9tistor, 20-mH coil, and 1.0-mF capacitor are connected in sertm9 c3drsm9 x.(rq/pj qt3s1 pies?

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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 resist. vypj6vpb j lp-+bq,1qunt1 7or, 20-mH coil, and 1.0-mF cappnb6vpq+u1j . 1-7bl,v pqjytacitor 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/0td5vd+ugyyp t/ e(f is connected in series with a 20-mH inductor, what is the impedan+/ df pt50evy /tguy(dce 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 20-07v,hzahtrl)uhr w9v: ,gi *dmH inductor, what is the phase anglezd :gt07 9, ival)rwh*rhvh,u at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil anddnr3qw cn: zry9x(jwsx zmt9 2,xo:*7 1.0-mF capacitor for a total impedance of 10d:zrxqxntn93oz: sy, r 7xm*2( 9cjw w0 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 10kd:4g l/i lym10-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 l/4mg1dl: iykHz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz fol+lxuh)dr cl /+lp-v :g/i3dtr a to-v/drl pl/i:hg xt c+d+lu3l)tal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fore57xonlv 4: tttr64zq a totarx4tq:5tt 6 4ezvlon7 l 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 a 20-mF capacitorp 5:zzrk8.rl x. What is the impedance at 10 rpz.lr: z5xk800 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 ser,l*ymxn2h ehmrisq ,;l6w z+3ies with a 10-mF capacitor at 1.0 kHz for a total impedance eym m ,h6lwqn hzl3r+s2x*i ,;of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacuyp(y: hzf- q-itor at 1.0 kHz for a phase angl(-y -fh zpqu:ye 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 kHz for a total ad.4oy.1c dnj impedance onc4 .jdyod1a .f 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 ca 6wz) :janmv5hpacitor at 120 Hz. What is the phase ang6:vah 5zw jm)nle?

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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 o0pqa*4yp,atd:i pj :and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca:pdpi 0jp:ot,ay4 a q*pacitor are connected 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 resxrfa+1oe ynbq ) 7(te7istor, a 10.0-mF capacitor, and a 0.350-H inductor. The cir7y (1teaqb xf+)e7roncuit 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 30 Ws) z*cd8gtiv-* bw 2xp, and an inductor of inductive reactang2v)* bdc *-x szi8ptwce 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resisto06ux1:,ptto fj kz0hg;la fsg(0t lv(r, a 10-mF capacitor, and a 0.45-H inductor, when ,vkhg: ;06 lot1gff((xup0tstja l z0connected 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 neb/5x*ta :x(von l xc5gcessary in series with a 500-W resistor for a phase angle of lo( c/n txxa5gx5*bv: $40^{\circ}$ 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-mH7wy6a iaodx4t 2h)ksn9 i9g:c, C = 10.0 mF. At what frequency should the circuit be dt7i)yn9chi9wxa:2s4 g a 6okdriven in 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 resistanbd* /ia8mu 9vdl/q:r8/t11 o r flgfncce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circui81l /f a9/iq rb* vumf:r8lntgdoc1/ dt 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 circuit is 5hfl kp:5d+i c$63^{\circ}$. 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 imp4r.nlhd h ,3fj.ieb8 9 eook.oedance of 60 W and a resistance of 30 W. What is thoeifjn..4.9 b8 oekl 3hdhro, e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circupqa0tqx +:c 1ait containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ina:x1 atq+cqp0ductor, 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 capacito u3p5c2(3dfz0z,-o9 n;rtaa u ,mhmqu qzxxj5r and a 15-mH coil in series?2-r,z;hucxad3xz(af3 zn5op,9t5qmjq u um 0

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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 capacitnvs+fmjszl 2i s7)b:3or for a resonant frequency of 10 2z)mifn7j:3 v+s s lsbkHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is 34 f6./*(t px licmzea+g kyjyneeded in series with a 3.7-mH inductor for a resonant frequency of(p +y . 4ejtk6*zgc/im3lfx ya 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 wm8o1k ns5zh,szuq8 r *ith a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz88 kruo* zn1,smh5 sqz?

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