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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 unjfivmt, h*ty/u1090vqd km;lits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that ljbu ,es* ij;6the $emf$ 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 2/z a nesec//awbta(9of wire in a coil produces what kind of change on the indu/ 2eb aza9/w n/c(steaced $emf$, 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 mn04ql gng8i /of the magnetic field through a loop of wire produces whatig84lqm /nn0g 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 of wire prlqqrc u g65p8ooq( z25oduces what kind of change on the inducep2( zqurc5 l85o6g qqod $emf$, 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 aj0ct ze) y1ae: 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 la k3jxs+z(6yxqnq1vqb a / -,vmm/28wc a aqsc.w, the direction of an induced current in a conductor will be that which tends to produce which of the following effects?.qv , /v1n/aa6jwc mqbcm32sqq-a kxz+ yx8(s

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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 horvuyr1p0 05+e;vi j cvsizontal table. A bar magnet is held above its center w+evv rpy1vj0 5cs i;u0ith its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fgk,us5x 0q g2 yuttzh4 e-vz/6lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, auh t s0/x,gy5u4q-tze g6v 2kznd released. 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 magnet0hhdum;w o sa*j,+6.clc/.ozclbbp ( ic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current ,h6c pasljol*b0.+(b;o hdmcw z.c u/ 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 to 5i-q w)r3kahtp in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the di )q5w ai-k3rthrection of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region pv,eqxp+jo405 : 5vyu pyk+szwhere the magnetic field points straiu:,sy+v popejyp0k v5x4+5q zght down. The magnetic field disappears suddenly. When viewed from above, what is 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 hor1 xrt3vu8 koe oag(.7tizontal 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, the induak.x3tgru8(oto 17veced 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 xy)(vwej6t /jloop of wire with the north pole entering first. As the ntvxyw e( 6j)j/orth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about a6zfe 9 a ,f7zsbfmk)p+n axis whose direction can be varied. In a region where a uniform mag7azp 6f 9z)f,emb kfs+netic 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 ih; z9-iyl.op7 o b0fj:2c;g uxzer ;urotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation x oufj7ulg i:2-oz. h;zpie; yrb0c9; 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.i. yfp*o-;i,km:pmjf
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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 w kuct zb 7uv-f2xm8tyc,/q 5n.laj,4$emf$ 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 magntj1.agv 9, tn bs 2m;yf(bge.tt.2or ietic 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 jjqos 4bt6-z07 6am7jm*phei moved northward at constant velocity through a magnetic field that points straight down.oa7p -sjmjejz q0*6h4bmti76 Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal ba)kdzscm- (l i4r rotates 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 transforms sxnzh8d3a3 a6

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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 fur*zv p9+ uf7yrequency of the +9rufy*v7puz $emf$ 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 devic) g4h0qu1 korbe 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 th:i(ns sa7erw(0m)d vo at

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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 l(dtyj )sdm0p /y;)owcoil contains more loops than the primary coil td0 syl/dpj om);w yt()hen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cw2o9m hte 28d2dsl*e, q8qth)kh 9ut jontains more loops than the secondary coil then it isddh9 9q m t lq28wjs,t2eohhtk2ue *)8 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 3 rr/yk6ng:17szo zck 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 circuit+ ib 9;i6 ,vqi:j 39*n j gaxfns)+djovgjk)wf,

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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 ser*x9ghxt*n 1dmies to an ideal battery of constant* 1x mtdhgn*9x terminal voltage. 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 connected in series to.2gbac bs(q a8 an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrobasa8q(.2bc gss 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 rr0-vjtkp+hezcp-,+ z d qdy 43esistance 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 and14 20 3j:jocv e-mob,6 4osaifgcbo gs 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 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 arekv5nfg7 3x dl9j 4 bn/:x.fwkd connected in series to a battery. The time constant for the circuit represents the tim7xkb g4dnfjfk9v/d w5 3n:x .le required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery isc9;o)ab1fesvvq 4d p4 up8g i. suddenly removed from the circuit. The time constant for of the circuit represents the time required for tho4p;f8.svcgup1d vi)bqe49 a e 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 n/18jmln( kvsyvi ras)fe 2.9have 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 connect l 47t9,69ym6wp1. zg1t qhrg aahscrped to an 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 powi;5rlr* * 0i(vie3pxv2ni)ery*t cxx er supply. In this circuit, the currentt*5*vxi;x(vii rl yx)e 2pn*ir3cr e0

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance-qo7m8h:0e c z3jeqy-sb m/ngf d3n 6n in an ac circuit changes by what factor when the frequencyd/oz8:7mn - hje6-3eqq3ymgn0 cs bnf is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the s f91nxsz8br1AC voltage across an inductor is doubled, the inductive reactance of that indu8 xs9 1rfz1snbctor

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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 acrscy(rjg; v bhz:jzi0x3o9dcd-2h2 ( uoss an inductor approaches zero, the inductive reacta c(jd(j0bu dhg-2 3;ix zs9v oy:2zrchnce 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 srk1-b t v9-6hpx ,f+jzrsf)m rupply. In this circuit, the currentzbrmpf 1 +t-r6 kh-j,v)xsr 9f

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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 c0awf8jycps 4yg. *q1k hanges by what factor when the frequency w s.4y c8 pj0yk1*afqgis 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 the5ibeg -m9yex 4 AC voltage across a capacitor approaches zero, the capacitive ye5- em49 xigbreactance 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 ipx(jlzcxr q-,2why/u.lk : 1inductor and capacitor in a RLC series circu qpyxuhlx,2c:/ w-1k rij (zl.it?

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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 dw s6/tffj sd-*efined 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 .o32go lrrfh /bmf: ;cuv*t8k psg-s4 if R increases. When is this statement true?4o*puhgb r.m:l8 vr-/sgf ftcs ;23ko

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circ.ub2japekim0+, dow ;-ik if(uit 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 seriesut 3.4tc q;ogd circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC - 7i2qxhp :95(ft6az igw4j oohmm:0)ioouy t series circuit, the resonant (:j9 :yt-6 qo 4o7p oom aghiixtif5 )20wmuzhfrequency 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 voltag i( qm gukvd /3)p:eub/sm/(uce. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC ci, c p3y:vflg-s5fsw* r/ xry0qrcuit 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 ae4q58i8lxr /,pf xid n4s-xml uniform magnetic field of 0.20 T. Find the magnetic fdxqe44l5if8psli xx/rm -n ,8lux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatinv8asw9c h k*;rg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop9hr*cv8 sk;wa 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 in a unid( 2g 86gxuuapform magnetic field of 0.20 T. Find the magnetic flua8ud g pu2xg(6x through the loop 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 l smxq22e,x+ iycra+5ooop 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 ch 1) b2igdrnk+mcic+y0 anges 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 turns of wire on a square framebv i; u/(tquku;;m4 wx with sides 18 cm. A unifoum u;k/;(u v4iwb tx;qrm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wirc-klb+w4-tnoqebs*lo ) gy,( o;8 hxi e with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area uq3 zy cr+c 3*vi.f;wm$0.20 \; m^{2}$ 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 wingp7/ rs;s2x cyw span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field iyc;x psw7r /2ss $6.0 \times 10^{-5} \; T$. 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 awnp,1u x85 uz6u2 dny9fqwjw- constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet z16w5-dxf,u9n uuq2ww jn py8ic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sompc b,bz 7.oce1 mr57e/v* qqectional 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 wirexn*7.e5 on kk2) 59t:wedab:a lssttl 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 it6eo 4*;dg/1r2 v shs)qinukfg s armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel t/2gr nqgohe6skf) 4v d *si1u;o 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 conshfm,(83u1yz dc17g1qy h :ems(i g deiists 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 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 AC gr5c qm2 ,qd8isenerator with an output of 12 V maximum wh,8 qrcmi25qsden rotated 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 generator with aq:uivpy v* 56i 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 motor operates on t:j urm- b48dync9t2e$120 \; V$ 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. T7tg ;f+lo4eui he motor operates on 120 V AC, and when running at full speed it generatoi l7eg4u; f+tes 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 rer(iw0 * df2reesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A.rdrf*ei2 we(0 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 is connected to a 24-V power suppl .zcr2zpd( ;z+sjqk e0ffx w90y. The operating cr.c92 (qd zsf z0 kw0+pfxjez;urrent 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 resistanc6gdg5v5ouxolpyf; 6a6i )* 7w8 lx3qiuh8b fve 6.0 W is connected to a 24-V power supply. The opera6)6aqv8x g fl3l ; ipuwodovighbfy* 75ux685ting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage ,5luh0. bpw1d2oe rgl 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 causesy1gc0pj5 l:.;rt bus3:lodq i 7lbhw) 14 A to flow in the secondary. How many turns are in the secondary? :5p ;b lu1 qjb7 ch.gll):osdiytw3r0

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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 hv/6s:k3grr 4hc1gpd turns are necessary in a 110-V primary if the 24-V secondary has v:rsh/rgpdkh3 cg1 64 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consin :vavbns7vv:( cv v)*sts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the vb v7c*s(vv n:n :vv)acurrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a trvslc 5e6hy:; o/bihsoop b+.2ansformer. Assuming 100% efficiency, how many amps at 24 V c2e .s + p56v ihoo/;obh:syclban 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 jeocq l /v9v4o 5yuy(5neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 1eu /vc55yq o vjy9o4(l20 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 3y*akjph)l// fdn whqz (w2.g ,00 turns on its secondary coil. If 120 V at 2.0 A is applied to the p*g dz/,( fjalqn/. ph2k )wwhyrimary, 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 its secoe po zedj ;zk2.zrmv::g7rp(u,) glu5ndary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondpe,z drm;75 uj elv(:o:k).g g2u zprzary?

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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 e :9 z*j+kcolek;g;h3 vb+ji+0j ddshand its secondary has 200 turns. If the input sdgh *v e;jli:j3z09 kbc+o+ d+hekj;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 transformer has 100 turns and its secondary haz,tf n(:+ e fwiw(5 ,iim/wcgks 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage i ww in/5+e( i:fkt,cm gf,zw(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 ha0ok*g k. 1tj(dapfi+e s 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pojo k+kpg.t1ae0 id(*fwer 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. Th.bx+2kkftn he m29a :(rzqa-o*zmjg8 e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota ra(ozmq + m8fxn2a he:.b* k9zkjt2-gl 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 curre*:96mqut4k mc l4cgs2qj4z e rnt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resirk26lmgez 94jmq:4 4tsqcu* cstance 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 g )0b j,q 0gi;or2vpmtat 120 V. The voltage is usually stepped up to 4500 V by a transformer and mg;,g tb2pioj 0rqv0 )transmitted 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 total resistance of 0.60 W. A uj3w,zwag qv*g w9v:k0o c8h3 generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What perc*vw 3gg,:w 0zkqw8ajv3chuo 9 entage 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 5msj8hnsc 5:4 bsk8h)c0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when thec ss45nhh8 b8jm):cs k 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 p7y. ae35k soi0hnbu 6zadq9-x ower would be lost if the7 heo60yzuxai. akdnsbq9-5 3 power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be j8mt:72:y owclo-ueo transmitted on a line with resistance of 0.60 W. To what voltage must t:m cl87w-o2 oeju:yto he generator output 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 : s,ngn 6w9kftx .wkg05.0 A. How much energy is stored in the coil's ma,g 9sk6gn:tn fwk .wx0gnetic 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. What u u/(ds9 tj5l1tu s+idis thisjtd id5su/19 t+(lsu u circuit's time constant?

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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 ) +x+qw+a w)ho tvsyp3cub,5d*m4yggin an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed i 6cryhdb6(u w,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 placedw.; hh, cmns2ezge/65vq1htd into a 120-V AC outlet. What is the resistance of the lat16/hh,dmceqv h.;w 2gz5es nmp?

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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 connect/zu7,fik2lcb w/e*yn qf 7 a;bed to a 120-V ac power supply. What is the peak current 7k fbcu/wa;f* y/,nz2i lb7eq 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-Vf a1w)yb8cget 7nl /gvx55,m /h3g rxw ac power supply. What is the power dissipated ilbyt 3v7gxngxw1 a m/),/ g h5fe58wcrn the 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 resvx-ovw 8b7ax )istor 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 re m ,m0 z f9n1ycgvcsj gav wxx16y.)zy/(a.x:jsistor 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 is7;3lieoo5c-n 6 b(( drddj esn $I = 0.80 \sin (240 t)$. 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 reactancelh*r14 nq59 ,yp0uib)a zmjsf of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-h zu6 ureoq4*04j,a ad1d-wf gmH 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 h y88 8ro8qzuhvave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157-z *i cjc6*lf4aeyfu 0 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 22 .twbgo, mqj.0 kHz is 2wj q ,..tgobmapplied 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 4; ; s)m b8dd5bv v6fg, /hht4.mgyvq5ig tiau2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor5q9m kv+ 6zs nxdab22n 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 k*a1: 4lrn75vs rk+koz0jsj zaHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200wad8/c yd ak05w gvm. 0q2w(fu W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaci 0t;s kvrz+l;p5 jdn*3fze f(otor be 100 W?npe;k(z+v 3rjf*slt05o d z; f

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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 th3o d+w1 oaa1f8b9x wtyrough a 0.0010-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 s i1ffci3.slw2 jl/9f 0mxa;;k- lzzban ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cxz92llfc b0 ils1j;m f;/z- s.k3iafw apacitive 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 impedanc ,bwin7rjp +j/x5obf3ybtl 0*e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cb0w/by xj b+np3j7t5i,*r l ofapacitor 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 if a 100-W resistor, 20-mH coil, e rxizf-g1z;x,c 2 hv5csf6s*yqel+1 and 1.0-mF capacitor are connected in series? 2fe6srz+q1xyh*,fcs e z1vx 5g i-;lc

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH8kjz ;k g+n/bm inductor, what is the impedance at 1000;m/gb+ 8nzkjk 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 indujrdun;3 2 b.-tc6mlysctor, what is the p ub6-c3ltyr; 2mjn .dshase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa6kfmhvn;entbgkd q+1t 99i17 citor for a total impedance of 10 1hn 79km;vteint6b fd91kgq+0 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 100-W resistor:c9vikt 89uins.d3yj and 15-mH coil to get a tot8:j9idsi .9kun yc v3tal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a to5b ml9xkwb(l7 bw7b95 lkl(xm 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 yk323:qzv+bsjrqrbj);vy v v z- 89 bwbe put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15jqv bvs)-+yby k83;39w:vzq2brz rjv0 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-mF5b f.xo ; ui.mb(el/pz capacitor. What is the impedance at lopu;xiebmz/b5. (f.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 kHz for a tod p9v4uwsrd o6 fd/t1x)upa35 tal impedance uv)o9f x1/p 6ad435t udspdwrof 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 capacitor at u*skl 3-ykt4k 1.0 kHz for a phase angle of k 3lk* k-y4uts$40^{\circ}$?

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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 serie123:p+ slytrd f uw:qms with a 30-W resistor at 1.0 kHz for a total impedance of 45 mt:2u:ys+ p r3w1f ldqW?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 1kqi 0do1d ;tcn080aih20 Hz. What is the phase angle?0 qk0a hdi08no ;1idct

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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, 2hv iw d92fwic ;,29mmb0-mH coil, and 1.0-mF capacitor are connected in seriesh;i9w 2,cwvd9mm 2f bi?

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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 1/onpvax(hu :e-pid , 90.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is a(d/,npu9 pvix-heo: 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 xj nmxf;sot-*j yxa oqm mj9:)99/ 7mf30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powe-) oo j9/fqya7j jxnmx9s*mtf9 ;xm: mr 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 contaw*qvhw,f;97dj u ln,ccb8 8geining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenghc w;9flu wd,7ne* , qcv88bj connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor forj.y e(itvy:xc:1 exd3 a phase angle of viyeyt(.3xjx :d1ec : $40^{\circ}$ 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. mmq yd.:.o 10ea1l tsnAt what frequency should the circuit be driven in order to have maximum power transferred from the drilsdo.tmm1 ena01y:q. ving 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 wixl4p /0e kaqq cs(0g6yth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the 46 0c/sgq epk0ayqlx(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 circuit isyz:4u v su-*seq7tib :aivq/tap, 7c 4 $63^{\circ}$. 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 imp eu +wa4om-tnt99a k3cedance of 60 W and a resistance of 30 W. What is t m9wt4a3ek-+u9a tno che 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 R (e21zxc+adjbbsy,2 qLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po sqyb2j(xd1, e2zb+ acwer 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 coi)sr dru*ps*8.hjonf + l in series?8*s ps dhj*r )rfo+nu.

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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 4af 7yb79rkytec eza.jn 6x8* (.7-mF capacitor for a resonant frequency of 10 kHzf7yye( xcarzn6 ae7b9jt.* 8k?

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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 3si -zhxjw4/)lj/pzy series with a 3.7-mH inductor for a resonant frequency of 1000 xlsh-j/34)y/wpjzi z 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 andw40yp( hes1 ,xcxw+ta a 40-mH coil if the resonan+c,41wa0xy p(ht xsewt frequency of the circuit is to be 1000 Hz?

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