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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 akt.(6 2gw g:ewe8 l plonj:4hof 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 indup:n p87a6q wdvction 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 +c-m b8( yacr.+aouqekind of change on the in++o. ry u(8mqa-be accduced $emf$, 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 strengthnaq ( u+7bgr3bxif,2 f/5rvpj of the magnetic field through a loop of wire produces what kind ofvjg f7pbx2+b, a /r3(urqn5if 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 produces what kind of change ox56+q3a*gx us mxv 0ptn the induced* 5xtpxs0q3x 6v+gmau $emf$, 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 fieldcs3p30j ni 2jgc0-oe n 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 rw1lxsd9g,r*4kyi4ikwcbj u (r, 9u6 a conductor will be that which tend ,w 6u krr91sd*rki9j(,lyxg4 4bucwi s to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovu5y:o rq+ 6leee its center with its north pole pointing down. The stationary magnet induces (e65e yol ur+:qwhen 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 abovey+w,xo3ac*u a wfc us:.qhmn 3aa;u9( its c.*xo ,a:;uuc nah ( m wq33u9yacw+sfaenter with its north pole pointing down, and 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* 4q (uqfa2wp5byak s7 where the magnetic field vector points straight up. The magksu2a 7p(fb4 yaq5 *wqnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level1kd n 3g5wrkmj.y3(nq table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in3nd.jm5wq1k(3k yr ng 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 regi*td1v4 ray:s ton where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as1dt:*v rytsa4 the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries 7gv9x*:mbxr j an ever-increasing current northward. Two coils of wire lie flat on the table, one on either siv:*g 9xjmb 7xrde of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering ff 2vkk xm7 8hfw:8,bdz*wieb+ irst. As the north pole enters the wire, the induced current will be8*ikzwxdfv kfbw8,h + 2:7mbe (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 angul o6b vcyor:) xq5i+wvw0 b;2koar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points ;xb :wwciq )vvb kro50y+6o2ostraight 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/t7 q)d nqut;x constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whan )7/u xdqqt;tt 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.p2r+1 +5jnv2psuqvr t
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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 qopv; zb 7chto.+l;e7 $emf$ 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 waqx .ul znz-eki;qo ,( p+x45field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nortg3w5g/tet,m m po v*q2hward at constant velocity through a magnetic field that points straight down. Make a statemenv3mme/gpo5 *qtg,w2t t 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 constmd if)/untne80itm jv 1+ori(q4 4ku:ant 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 transfz- op:- ,synhcb. h/jim 4zp1a3mk(byorms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat(ihs . v xi00h:*(0xt4syxh7 samaedtes through 60 revolutions each second. The frequency of the x*dei( 0mysta ix: 4(0a.hst7x 0hshv$emf$ 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.r4a m6nzir; 9kfghva g/;m8ke 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 device7u 9dvgar. hw5 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 lo :rw a41vld y; eiw6o)rg:u0wtops than the primary coil 06oa t:wru: w)yv; 4lwiedgr 1then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seconda,k8lms8s f qp .ja,+clry coil then it iss8.fk+mjlq8 c ,l,sap 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 po)q6 wj4ig0pbk wer 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 circuit1qa9*z.h4wtosikbc; 8 7gnvp a /ypv2,

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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 bateyuv1 f,bp/; utery of constant terminale1 f,bup /uv;y 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 an ideal battery ; ccufy6.i-sl3ckx4p of constant terminal voltage. At the momentc6 fuyk4ic s3c-x lp.; 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 inductance6cbvigez hng)0.5 eft0v )m9p L and 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 Lx/+halpenr: p8k79+j9bx ak r and 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 are connected in series to a battery. (lv3em g-4uqx The time constant for the circuit represents the tiqgv-m3 4xu(le me 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 i qfue17e; i.u /tztwq*n series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit rep u;.tt1qz wf*u7/e qieresents 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 th :h py:bf1pq)u9d:jmlx:f +0zerd(mee 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 an AC power su em-skq/m/pnam e u*4lp;mz2zb,:g1gpply. 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 /66ri fnr x:ndpower supply. In this circuit, the currentx /d:f6r 6rnni

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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 lcadl d wzn5e7 p :zg-9k)/)lwf5dgj(circuit changes by what factor when the frequency is triplenad z) l/d(w)5-lp dj5:e kfg 9wc7zgld?

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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 doubled, th0qb9bkym*7b; is 3geee inductive reactance of that inductb se;9bkig*70eyq 3m bor

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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 8i;;s5vs 1pqbx.ca j3 oyon +fan inductor approaches zero, the inductive ainvp1;5oob +.j;fx3yq8scs reactance 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 connec .8a:utt io;+wbe l9etted to an AC power supply. In this circuit, the curreit.ew; : +9t u8abletont

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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 circuit221jd-k ub acj8dxyb49 6zfe g changes by what factor when the frequency i9k1f-yd2e 4auzj cj2dbg8x 6bs 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 capads-yg.l 5oypabm x8ge,84c ezy7:7d icitor approaches zero, the capacitive reactance of that caase7pgz 8m8bd 7 diy-y4xlyg ,.coe :5pacitor

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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 ir :k:ya3aq1 ftnductor and capacitor in a RLC ser31aa:ft qry:k ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circudkyvhz+t227 uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increa-wsm) + xb/floses. When is this statement tru s/x-b o)f+wlme?

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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 circuit increasei9(cb q 0s, 2ku:hfmhfs 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 increv a 2nzh5.n8jwases 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 bothh+r0m m4tir6t0q7d1 l2n zbmb double in an LRC series circuit, the resonan20bmtl n zr+i htm740qb61rd mt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by3mfij 7 qku.nsj4j (, 8d3mumz 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 series8 pzps2g*j-v e 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 radiusgrei9ude3f */ 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maf3re9egu i*d/ gnetic 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 r/s;y :ycsbwctyvr qt+226 s y6otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendiculcr qt c t266sbssw;2 :y+y/yyvar.

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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 unw q;z7zsad8z1 ;7umr nkgsz6 1x6pg/ dy *idp6iform magnetic field of 0.20 T. Find the magnetic flux through the dmydw u6 7gzkx 8z; 766i1q*gpss1z;azndp/r 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 loop is *o9efu6kki- d ikm7 *sreduced 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 c ua.zcesvm */n8.cs8ac;a /reoil changes 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 fdik dcw*5061atnw d (h.chlg3rame with sides 18 cm. A uniform magnetic fiel 13 wkhn6*wh5 a(cgd0d itdl.cd is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an are d5o khei 0i(totyz8e*:hfk;. a 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 nnq*4 4 3oqjs.jwfq z;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 location wheredb 27lp l:ws7k the 7p7l2lkw bds:downward component of 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 2.0 m long rotatedz6-ibn swei2v2 *)sas at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic ns-*6 eiwza)s 2i2dvbfield 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 smxk x ,tek 75w8(vqttvh*e52 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 xnrzcjd(r/, dxz8(z -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 recta4sh,yqd(z.ry(3r kg . p8difmngular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum okr.,rm3 d8 (sy q.4ihzydp(gf utput 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 areau (fk8vi+n/z c $0.090 \; m^{2}$ 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 generator with an output of 12muibe9 ;mq xnd64z**t4 fpdvl+6q1yt V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availab;tmlm*epbfvnzqx6 14 d* 6+yqud9t4i le. 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 a maxim3-wcjq,/nvciiw9c r45fe- (s7xvu fkum $emf$ 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 openf 1; iow7hj 7k8e:kyfrates 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,bsem8o1ezx6oimb:2cs b- 1e a resistance of 6.00 W. The motor operates on 120 V AC, and whex2cm1o m,sbb s ize:b6oe1-8e n running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance hgn9 zcxk fy:i,8c a4nr+td 0ew2o4n (6.0 W is connected to a 24-V power supply. The operating cu+ndtfoenr4 ha0ic 2:n zyk98 (wx, g4crrent 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 is connected to a 24-V power supply. +w//9quuocyg The operating current is 1.0 A at f/q/o+9uycu wgull 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 resistanv(xd2e7 3mhise sn3: xce 6.0 W is connected to a 24-V power supply. The operating current is(7d3env3i2:ssxh x em 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 )x ,oquw2nhnl:lih2 .to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes jl5q)bl41pq6t m+kwc 14 A to flow in the secondary. How m6w)qlqp 5j1kbct4ml +any 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 primae.x8 vjs9 ;gqfry if the 24-V secondary has 100 tueg. qvxs9f;j8 rns?

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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 prio (ytdb lc(vl/;-y 3wimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in theytlvwc/ o ;db -(i(l3y 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 transformer8oy y7/ k4 w /*2gtsdw7w7 atta(tx(leck3ucp. Assuming 100% efficiency, how many amps at 24 V can fxy/7*utdkwao(s3k 4ty2ga8cc/ e wpl7( w 7 ttlow 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 tra-4* djusv l:swnsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dra*4w vsul :ds-jw?

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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 coj;qp +z+wx m0gil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prpj+mg+x0z;w q esent 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 primax b-t33wb3yoo: vgpz *kp)3icry coil and 300 turns on its secondary coil. If 120 V at 2.0 A isvt x zpi 3333o*bc-b p:oygk)w applied to the primary, what 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 transfj0 02pytx j,jformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect thyjpx00 t2 fj,je 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 secondaxwwl4k f1v8.9;kw qhdry has 200 turns. If the input voltage to the primax8q9.w4 hwvk lfw;d1kry 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 tua4b1x+ ui)d alrns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seconduxbl)4 i1aad+ary 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 s x) f gwq 9ikoo+vp9--ge+-qbgtepped up to 4500 V by av -fgi9o +gow-x9pke -+q )gbq 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. o)qs,.5c*dtvewls0 z m 9.w ku The voltage is usually stepped up to 4500 V by adso0 ,qwme.st.zk 9)uvc*5wl transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 123cy--tzqn,v ( 3eo)pwzn z5f)dj qiw.0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lostjztzwn(z5wq. 3qo i-v, c3fdp-y)e )n 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 / 9rd:vfw r/4i8prbr el+2hvn 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. v p 9rbrifhd+:rl4 w/2rn/e8vWhat percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total rm0y odby .dqwd .)6ql8esistance of 0.60 W. A generator produce06bdqo8dyq.w.)l dyms 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 8f4oh 7aa7ma sz)ah7vV. How much less power would be lost if the power were transmitted at 3000 hv74a f7a m a)8a7shzoV 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 gened gb.hpnj/o;64q4mhs*4us b v rator is 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 transformers4pmhd 4q4 *g bhvbnsu6/o .;j 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 5.0 A. How much energy is stored in the coil*h+8g7hsaf*cb6 be xg's magne*b6bcgesxg* hf +8h7a tic 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 chkh0 r,9k uy7contains a 6.0-W resistor and an 18-H inductor. What is this circuit's tk7hhuk,r c y90ime 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 in an AC ciia:g6t ly(jprq) 2+ifrcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is tduy (r); rub;ihe 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,x5)py -fl yyc-V AC outlet. What is the resistance of the lax )-yfycp ,yl5mp?

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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 +risoh 1gwv57 t.yr5g120-V ac power supply. What is the peak current through the resist1y5 h+iwt.s v5go7grr or?

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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 tomgfb*i2f /h:yddfhpuck 4*r)f8lecn 5+6ya3 a 120-V ac power supply. What is the power dissipated in the resis+y un di cgfhh6 e8f 5lff*2cy :mdrb34a/)p*ktor?

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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 y-p.g)lk/ rdsis $I = 0.80 \sin (240 t)$. 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-Wt/s;m8l4 8t7 i.w .oynk *2ntwzlkrb2( llshe 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 5sv;r1f 8 d5dwc0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at ni2q4 koolj, ag ::tr).r;pzd 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 reactancn;zxc;cs .;m3 dw l9gse of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 1ms;: y mii5/68ga hwed4.0-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 nece3-k38- ghrjye (ob kkessary 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 i-lu4e ;kdivz+ s applie kd4eu;z l-vi+d 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(yk4yfaum esm 0 udg-t66 )sz* 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor a d z1:h z .lk0k.oyg5iyar;(tat 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 kHz3 ue,na4x,cd9i. yimo?

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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 1zse45 ykfcw/g zi)kqp,q; w02200 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 97yhi*3j4kmay; jtl2 tw y*ffcapacitive reactance of a 0.010-mF capacitor be 100 W lhtf2jymy9;i4 tk **a37jywf ?

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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 capacitor at 1000 Hz and 5.0i97 8dc :e6nwy om.6dgqni bs7 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, .zt nr r;8sz+g15.0 W inductive reactance, and 10.0 W capacitive reaz n8sz;gr r+.tctance?

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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 resistor, 20-mH coil, andn 64 :x.toxosm fg59pi 1.0-mF capacitor are connected inos om:xxt6np.i4 f 5g9 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 100om e(00jv :-6jjemy lk-W resistor, 20-mH coil, and 1.0-mF capacitooe0 6(kmy0v: jljm-jer are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indu ey3;i(tl)b7l2ri2 1pqwkmqz qkr k 42ctor, what is the impedance at 10 2qz( yqk4p i2m;iq tb) 7rkwelr32k1l00 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 witevat :mqt0 6y1h a 20-mH inductor, what is the phase angle at 1000 Hevm: ayq6tt10z?

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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 s 7fe0vhdl-:tgdvmmg*-c )q;z eries circuit with a 20-mH coil and 1.0-mF capacitor for a gdc mdf)h -:7qm* g-lv0etvz; total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with c.*3xb oph x ejz;jue4:* dwn*a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200e*x;jxc bd* p3: z4*. juweohn0 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 inductorrcox.*+et51xpiv ;/) nhor hh at 5000 Hz for a total impedance of /cho;.nrh+hox* 5revp)i xt 140000 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 resistj (z846h trbtep*hwf*or at 1.0-MHz for a total impedance o8h6( eh rj4p*tztbw*ff 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 cs x:,h vw ou/w0sr. h)u-nvga(apacitor. What is the impedanc0hx-r(n su uav:/ghww.s,o)v e 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 serimf 2, 7ak0gihzes with a 10-mF capacitor at 1.0 kHz for a total impedance i 7f,g0h2zma kof 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 capacit)ybhhslqs )j, 1s9w :lor at 1.0 kHz for a phasll9s))swy:qh,h 1 j bse angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resisto 6 w /dl*8)pkxje+ypss qatv-;r at 1.0 kHz for a total i jypw+ 6 8-vpe*;kxs)aqtds /lmpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. 9yxhiwq o cxw4,d9b() What is the phase ang4yh 9, cwix(9bdxwqo) le?

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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 coil, au4,dhim pg qmzq*. r49nd 1.0-mF capacitor are connectp, him z9ur dmq*q44.ged in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and lnz7+p;lss qo+p,v, hh:rue+1-jgs;3 ozp fga 0.350-H inductor. The c oj +z; n7vhz+ g,+:lrlsps1-u ,sg3op fpe;qhircuit 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 rea:-orik8sz e2ud u 0bfh9l1 ad(ctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V,z8hd :f21u0kdi9rls u eo(a-b 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 circuigu0 ht.p09mnl)2kvc oq/7leit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connim 7)qll/ u kocgp90vn h0t.e2ected 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 neces7esga ad4xw 4s f*qktoa s+a(+t56ch6sary in series with a 500-W resistor for a phase angle of 47ko+ sc5thfadg( +s4s66a*atx ewqa$40^{\circ}$ 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 h5 ty6q(xncq- ro * or981bcpydas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferredon9t1cx8-q 6cyy p (rqdo5*br 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 withyx+wf8.r v )rw 12.0 W resistance, 15.0 W inductive reactv r8.+wxwfyr) ance, and 10.0 W capacitive 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 circuit is 7) aug8js4hzop6v(w07qw 1m e jnz6qm$63^{\circ}$. 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 ( 1wia ay99pq25+p cs1sx7t3tdov ehe of 60 W and a resistance of 30 W. What is the power factor? yqet5t7s13 x1o+2v eipca(ha s9wdp9

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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 circuit containing a 50-W resistor, asr(ixsi)h ca16dtdm6vh8 7+ v 10-mF capacitov6cvit+hs i8h (7xr6md 1da)sr, 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-mFo5rxt 6edqaw 43 ode)-of.q 9o capacitor and a 15-mH coil in series?-ood 3qe o4)xqo95 a .wdref6t

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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+1 9juli7mb (wfwm6g b.7-mF capacitor for a resonant frequenji+(b 6gfwu17mmwb 9lcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inducto9nrp j+ g8*cgla765nim*q crj r for a resonant frequ85g *cjpn j7rina *+g9l 6cqmrency of 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 seriesxm,1nb nw -/.wdc.c)fevieywi / u9q; with a 30-W resistor and a 40-mH coil if the . )iecbwdne1cfix; yu n. /qm/-9ww,vresonant frequency of the circuit is to be 1000 Hz?

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