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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 excjces 22ikbi0 +ept

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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 tha)x:ah zg0z xayhm pk gugq9 h(v4d8(/)ip v9x4t 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 ofnn2:yyg yu ,xdh a6;u- change on the induced y:6xu-dn2g y hyn u;,a$emf$, 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 throumip tfau-r,7,gh a loop of wire produces what a imtf7r u,p-,kind 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 oy- h4c0 l, loyvec0:mtf wire produces what kind of change on the induce cmy0ceoh,-y:0ltlv 4 d $emf$, 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 a8tx(vb7-f xj t ek i/1aj2qn/an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduct8tzt/;5 i/nqs ui40 qongsmk+6gc: p nor will be that which tends to produce which of the following efngnqm:5i;s k/p40+ttizgu o 6s8q /c nfects?

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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 abovpm/wg p(/v)ikwtxafn+d :l )8e its center with its north pole poiai+ dxpmtwl:pgwv8/f k(n /)) nting 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 abnv :djo4v.x9e ove its center with its north pole pointing down, and releasx9vn.4:vo ejd 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 in a region where the magnetic field vector8 4r-py70g9dtz9xqhai5 qj xq tw: bt0vl8f9h points straight up. The magnetic field vanishes suddenlyy9-5w gtxi8q 9:9 tl dzr x a407qh8jtbf0vqhp. 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 epsdas; /lqj16g9fj 2 icn2.g top in a region where the magnetic field vector points straight up. The masf1cgg9. i2 2;qjjd nae/ sl6pgnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tabc m:i wl2k6p1u :9nfi,spi xv6le top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current f:xl ippnu 9km,i1 s:i662cvwin 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 hohfel 9+c3em8erizontal table and carries an ever-increasing current northward. T9e8lf mc3he+ ewo coils 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 loopyh5s-md+3 qr 8c(limfg3y 1(io+ xxqj of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (j( xo lrsfm1y q(yx +m3id5-qh38 gci+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 angular speed about axd0z e8v5 66 pvw-om)zmudws 4n axis whose direction can be varied. In a region where a uniform magnetic field poi8d4ow)svpz66vd0 m w 5ez- xmunts 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 angular speed ft0hr 8- 7.9ofv vbgewabout an axis whose direction can be.ew t-89 vg0h b7rofvf 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 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.v 91gwn1)r1ch onj1lv
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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+ik6)j-sw gl uoo 1qf51 1bpus $emf$ 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 rxa +134zxkpbxkbgwu/ 7np - 6magnetic 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 (orientefg-hc 2*p jn/5db*hl ad in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concer j*la gf-5hcd*n/p b2hning 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 3926qbb a0bydar:jjlangular 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 generato s)(oyn.iqmtf:i.2x2rt m +ojr 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 second. The freq (+zrnnt08yoi uency of t zo(tnniy 80r+he $emf$ 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 used m1 b;x rdwn.dw igbc/1ht;2i6 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 de;6n4ies ng uragj4*f :vice 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 co: *k6myzqisp:76 wl gpil contains more loops than the primary coil then it6y zi:p:*k lq7gmwp6 s 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 con,yego+yi 0ziuj2*t c3 1kgr k6tains more loops than the secondary coil then it3io 2zk 6+kgye tujyc1 ri0*g, 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 pow 6eg;glf y53ts 0zrw)per 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 circui.f/pa4poq bl ,t,

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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 batte284k ccu/t csais ivyd0/+c t4ry of constant terminal voltage. At the mome/as/ y4cc iu4+ds8cki0tt2c v nt 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 ivxc cvnngv0bc5a 8)6 (m9p2 isdeal battery of constant cvamb(n85p6 0 )gi 29svcxnvc 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 a 1;tbo0ig: 5krwztx 8.7x txpcnd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectmzn ic,t6 pk vuw.v(3m g9.z7oed 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 serier: ue9j8 x6fgps to a battery. The time constant for the circuit represents the time required for the currentux9jfe8gp6 :r 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 )s pgn,b k:6e5km-rz q tc4;vjconnected in series to a battery. The battery is suddenly removed from the circuit.g6r cz,kk )tb;v esm:q5j -4pn 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 sametqc*h*dx1k c.n+f6 wf 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 suppkr q:7wgko t d.w:ua(-cvcu77ly. 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 connec gkk5 7w;a uuy32d fr:grzx38cted to an AC power supply. In this circuit, the curren duk2fz7r:;r8kg3 agu3wcxy5 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor w,zh7ftp (;mh zhen the frequency is hhp zt,z7;m(f 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 ip(luejx m2sg9*.jge 8tu *v, voltage across an inductor is doubled, the inductive vpjg* *s8xuietg2e. ,jlu(m9reactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the in o -;34*rm ,1e g8t*uszyfe*gbbztwzv ductive r e8s,*t *;umzz-rgywe*3 fzvbo1 gb4teactance 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 a +g qey 43zca6ucg5q1en AC power supply. In this circuit, the current6q5g3+ qczu a4ye1eg c

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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 tk67q prg4rg(qftht0bq 90 z;frequency is6 ;049z7tfhr gqrtqkbg0 q pt( 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 capaciayi;lj0+cmp at- l fl9;9 x8kgf(e5ik tor approaches zero, the capacitive reactance of that capacfamfe l -9x08cyi l k;ai95gl+(t p;kjitor

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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 tg3dl )s8 q*vogb2 xx(voltages of the inductor and capacitor in a RLC series circuid) g2o 3xsv( bq8xlgt*t?

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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 772osa b7;/my5*c vibz,cl3 ece jevm as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if f0f3buupd 47s R increases. When 0bu3 7f4sfpudis 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. *1/zbpj;qc6 qv 5anjt:3cpr aThe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The imu vz1l13.pn dmpedance 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 double in an x*c qxfa5gc:gaxf/ 24)qtc p2LRC series circuit, the resonant frequency xf x4ga aqptx2:fg52c* c /)qcof 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 t :t5v m)hpddl;hat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuitp0s hszxr35c( hnwy,o 1k(n+y- wrkrj wq5m,3 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 rotatinsu+nihj:i4s dsu 3o2q2uym6 t-u a-pp*xov 4 8g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thej 4y d3ippu 6 :22x8-4v atsumhqusn- usoi*+o 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 magnetic fie6lj2 m)s,8hpz bko1mkld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic6)mms8oz2lbk 1 kh,p j 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 radius6pfehx2 mb - nw,xv;y8ty sk/:n4il/v 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the x6ntvh,-e yi; /n 4y:/bvfp8 xl2km swloop when 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 single loop is reduced fr+i kypykq 0(kp;7/fs wom $1.0 \; m^{2}$ 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 fe3b) (5;q e-katimehu( pkd9 irom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire ony-i1tj70l7ik4 gxft z 4qc sc3 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 lig34kz7itfc0-y7 xqjtc14 sin 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 tur d,z) frjj7.i *5fl(bzbevaw4ns 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 6zdqvyu 3fc5 hjx2h :2a/jnf4and 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 w 57o2sghjfs+a location where the downward component oo7 +f j2hgssw5f the 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(jh+c0at+pu o,rguxf+he. v:.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiele0,rth g.+c (pv+fo+uxuh:jad 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 cross-sectional 2dzqvl89n m y5area 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 turn(q 2fe+ qlxcx/,3 aeqqzvaa;(jz5 v(o9 gn:e hs 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 loop3.ej ckb - owv9,usof0 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 0-vu bo 3skwofe.9j,cmagnetic 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 wir 1;ud:y1jk d i)48qvqadlrvm+ e of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple)jo zcqz;+25j8li wd*vmq; kqy.z 9pu 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 5 ckw2odu )iyq ;vzj9j;plmz8qz*.q+ area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximu ft++d ns5u:o,e d58h uzjotlv)m( 1gym $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operat2.6 vum9k3edp 0cutw(gxqqp 5es 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.gl5z-t/u 2muu2 k m:gh00 W. The motor operates on 120 V AC, and when running at full speed it generates a back /lt g:2h5 km2gumuuz-$emf$ 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 ee( 1t.wiar.c ;il:knW is connected to a 24-V power supply. The operating current is 1.0 A. What is;ltawcir.: n.e ek1(i 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 resista n ,(jg; se5v)efd:qzjnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is vjjde;5fqs z),ge (n: 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 resistk) dw(yo5sa mivf4*m/ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full wv/s)imd4k *yf(moa 5 speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary u. f+7pxmyi0a 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-turnrep/ q)qhp c;yt3 r*8c primary of a transformer causes 14 A to flow in the secondary. How*3cyc/ qr8et;r ppqh ) 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 primary if the 24-Vz16jwvqn8so 9 secondary has 100 tzsv1 n 8w69qjourns?

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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-tus1xibv05 buy/:g 7g *h86r;mubo yusbrn secondary coil. If the current in the secondary is 3.0 A, what is the current in gmi/ b b ouu*h8usbv1:6yr75;s yx bg0the 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. Assuming 100% efficiency,n+tid,i1yh2 g*:sx yyd* 7fdt 71+ :dd*yy gdit2 tnyxs *ifh,how 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 Vp vm cj geebqdox+2ez(a8d8:di)h7p6/ brj1) at 10.0 mA. The primary pmhiv e 6jgb+ oddzce2j8b)1 7(e q/a8:xd)prcoil operates 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 cobqvom1 nol (kj 4h063fded*l0il and 300 turns on its secondary coil. If qlk4 6f1v(3 0*dbjh mnloo0 ed120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on rg:c s):sfcp: its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is:g)c srp: c:sf present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary)1 (hryte4nfu has 200 turns. If the input4t1ryf(uhe)n current 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 transformegu k7s/yvy+r0)pu+a hr has 100 turns and its secondary has 200 turns. If the input voltage to the primarv)+h0ys7+g pry a/uuky 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 s(/, vdxfqj2cgi . tyt9econdary has 200 turns. If the power input xtfcj(2igv,.9 y/q tdto the primary is 100 W, we can expect the power output of the secondary 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 voltage is usually st3b e;apjn4ds 8epped up to 4e3 n8;b d4ajsp500 V by a transformer 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 voltagehzj./ :juf60zxqah-gpsk1fo: j j( +l is usually stepped up to 4500 V by a transformer and transmitted through a power line of total re(q+xou f6h0hf1 lj j :zpzg/:a-j .kjssistance 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 stepvqs h5j v08/hmrua8 3pped 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 trajs0/qa v5v hr 3uhp8m8nsmission 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 haszv suahc)70gk3zj4 b8 a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up a80huz 7sj)c34 k zbvgwith 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 to4g+, ;j2f (xgbvt ztohtal resistance of 0.60 W. A generator produces 100 V a2x;4t j b h+ovfzt(g,gt 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 1000 V. How much less power woe) g e :96bgjx2bxvz0luld be lost if the power were transmitted at 3000 V instead of at 10 xb ee9lg6j) 2:gzxb0v00 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. Io90u mup27gh3fxl(yn wqe w;8jz5p 6 qt 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 transmission is not to exceed 0.0(u0 pg ;5 xjezo fm98hu7n3qyw l6wq2p10% 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 enx 7 oll6*gmik2lt s/3zergy is stored in the coil's ms*i ll2gxl6/3ot7 mkz agnetic 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 an7x s/v gmzuu01d an 18-H inductor. What is this circuit's time constant?/uzvmu7 g sx01

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vijdjvt.gfwnfe 4 6p 9-,;0 sips6q8ir oltage 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 outletf enq)d nw/+m4b ym*z/. 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 resistance1s fkok /k.rw c7irf)wie.43i 8ql+sq of the lam qi.o4 7f3sfwkis.1r8+c/kq)kw lerip?

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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 cot0lws 9(jt k7vt5gba e j q,hbrf1l:1,nnected to a 120-V ac power supply. What is the peak current tt1trl(7hw 9f,ta 5q:1b ,esblg 0jkvjhrough 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. Whatcyl) (e.e((co/ko zyg is the power dissipated in the resisto cey )c/l((yez(ogok.r?

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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 1 8fx9xoys;e m y8d5mw )+nkuais $I = 0.80 \sin (240 t)$. 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 at )0pck qf6w.( orbbt:nj 0y(y 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist5* i*k:4v mboli qtq;cor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor atuw99e mj.r,u j 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 Hhp+0fay 2*p9niqw7 zmz?

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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 ip;9 adrsj27xqo 9 w)sa 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary :vgyo.ec)a; ,-xcdv c zcn;ms7i q3b+ 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 of 20 kHz 8v01 bxrwuies :)b *vt gkti,:is bt1sk8i ) ri0*txv :vg, u:ebwapplied 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 im mnfgyv3:/) 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 capacxpv6 r l:qd-;yitor 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 reactance at 10 kHzht o/w)dk+le.?

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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-mFxc (p9ws1b nbe r. *6tc)g(6ku-aximm capacitor 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 re)2biafu / r-tiactance of a 0.010-mF capacitor be 100 W/ )uta-i2r fib?

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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. at9wi6*9jr )6sp4h(o zlj 4if4zckkx0010-mF 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 ci5 90m7ayaqu mprcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capam59 ya q7m0uapcitive 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 impedp)1 ln hl.5,3 k-nmchqb* fl+fefbu 6aance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri6)f1l5b hcbm hf.nan-l k*qp+ 3ufl,e es?

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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 H.81k1:uysc*l) g cmrw n7xtpyz if a 100-W resistor, 20-mH coil, and 1.0-mF cac*xtk7y 1crsul8n1 :.gwymp) pacitor 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 i/+f;up 4gu ex8hx6xmmn series with a 20-mH inductor, what is the impemxp+ x uu8gh/m4 f;e6xdance 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 conb (ro77ed( 65fv/ssvj jn7 li)ueqh4mnected in series with a 20-mH inductor, what is the phase angle amv7jb)7i jsusvflq6 o5(ene(/d74r h t 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 ser .wb .jif;z:weies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance ofwz.ij.e:;b f w 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 f1uc;j1 au6h xis needed in series with a 100-W resistor and 15-mH coil to get a total impedance o16ajx1hcuu f ;f 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series wi9v se3kf+ g)gijh wncd6)vt:4th a 450-mH inductor at 5000 Hz for a total impedance of 3gf+4i)nhdw9vs6k)tgv j ce: 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 bescl)kts w,xy he8i n.rfi(1+; put in series with a 100-kW resistor at 1.0-MHz for a total impeda,1is+wsex nkr ct (lf.)8yh i;nce 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 capacitort(9rod f b8:tp. What is the impedanceb d8t (opt:fr9 at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at v1dy2+t(h )bdi2 jxvwys /coc z:0f0 j1.0 kHz for a total imphcv02b d 1 w /( v2jt0o)scy:+fdzijyxedance 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 capacig,- z 3ii6zzcjtor at 1.0 kHz for a phase angle of3i-6czzzg ,ji $40^{\circ}$?

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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,l4 ensi7 o bj8djwk2lai. r7. 30-W resistor at 1.0 kHz for a total imped7 ri7do ,.a.b8kn4wje ijlls 2ance 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 wit .2 zrmypluz3tjz3( :zh a 100-mF capacitor at 120 Hz. What is the phase angrpuy3tz:(z jz.zml23le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mh l 4wiaw.*2ct:zloe5H coil, and 1.0-mF capacitor are connelwez.52 4wthaoli:* ccted 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 consvc qieos58z1 g,zb3i8ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Thz c3eiz8gisov1 b,5q 8e circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an nr+yq,x6cekfm: s; d/ inductor of inductive reactance 30 W are connected inexfyn m+:c 6qrs d/k;, 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 conn1 9 jw44d) g*rz2relh ,gurbttaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductorjdl w,ru4rrhe)4 * z1bng g92t, 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 50(qf co6 k+ms(e0-W resistor for a phase angle of o m6k eq+(sf(c$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. q5e6sw-pix:i gqlu /* At what frequency should q g*:qlpwi-5s xe/ui6 the circuit be driven 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 resistance, 15.gn l-ns7k owe7m: .ok2jq03/.cjm izb0 W inductive reactance, and 10.0 W capacitioq.s.jomkgn:7n /kb-cjwi 0ze l27 3m ve 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 ida 6l, n;th(zcircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 36ndb hqwd xmv9 n0-i:0/uol1 g0 W. What is the power fnxi0ql b9ug:n / 1 0dm-ohvw6dactor?

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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 seri7.iq brk3;4 (rl bq9x.n olsvhes RLC circuit containing a 50-W resistor, a 1kqb. 3qlibvls;9r ( r.honx470-mF capacitor, and 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 sesrb d5,bp4j 1 jv(jxy1hxu*p(2xq )pqries?xyppv4) *((1r 1b 5xqsq,djj uj2 pbhx

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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 f pc *su/hg*-yjor a resonant frequency of 10 kHz? cu -gh*jp*y/s

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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 induc-ms,rq)j 5gbre /e7qztor for a resonant frequency of 10zqj7erqr/s -b 5g,m )e00 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 plac-rr4k wxm :gq*ed in series with a 30-W resistor and a 40-mH coil if the resonant fr-xg:4rw*mq rk equency of the circuit is to be 1000 Hz?

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