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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://autoconfig.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://autoconfig.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 of magnevxr9tn gn+(o:8jc :ydtic 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 induu*f:l3/ ag6n5-fkee4 (c3l ujfq gdohction 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 prouc co1d 2ulo6)duces what kind of change on the induced l)2 cou1cu 6do$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wi xwpgmka v*j,x;0vpr -upq.2h))0 fwe re produces what kind of change on the inducgpv0 0p)fx xurev .,j )a2wh- mqk*p;wed $emf$, 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 prrq9myq,pcv 4be*5x.8b; auo gk y;y4xoduces what kind of change on the induce pbm4y*xvq,ey4r9x8 gyquk ba;5 . co;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 7 6t0wsq1 cad.q8i, elilue3c9go+ocfield 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 g;h,gbbupqm4i eo7xt. z6-j 3law, the direction of an induced current in a conductor will be that which tends to produce which of the followin zum-b., ehb j;gt467 3qoxgpig 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 bas- 2kk7ul d(nkco+* cfr magnet is held above its cent7loc2+ us-( fck *dknker with 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 flat on a horizontpsa,x b2ga8e8 al table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fro,psb 8a 8aeg2xm 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 magneticqff h hr,0/sm3dc 3p7l field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the f33dlhf/, mq0 7srcph induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic 6ud5 e;fchb 8vfield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current cdef8uhb 6v5; 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 where the maggu i- */xkd2lfnetic field points straight down. The magnetic field disappearidgl/*u- f 2kxs 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 horizontal table and carries an evoz(hf1 9,wn2jzci:gxk ( :e daer-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current ci,ezo9inwg chk (d:zfa2 (1j: xrcles

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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 firs1wh v- *)k c)6zogyvppt. As the north pole enters the wire, the induced current will be (as viewed h w)g*ov-)6pzy c1pvkfrom 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 an axis whogkytj:8jwp 9ad9 5pj8se direction can be varied. In a region where a uniform magnetic field points a859 jjgk w:y9pjtd8p 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 convq7frs i b .7rq csq2 +cng6clg:,* f39fmt9gdstant 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 of the loop's axis 9mq licnt7c+r 7b9ff6ggfr2cqs3:gs. ,vq*dof 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.5c4hnm0fc.an 6jm bewt- m y6/
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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 thpo9 b-rvd3,7;o o ewbaat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.kvh1-+zfx 4r ceeo2mi *ucy51 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 w;75sd pj3mrc-rk8 yf) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced a ;3-8frjkms5dw7cp yrcross 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 rotzu1nmr,dr2: a ates 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 ;/ yztwja,s( m ddz1fmm(k2l4transforms

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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 exe. gzia0 nh6olf(nmj)z 5+ l*ach second. The frequency of theh0) f.lim+5lj en*za(o xzn g6 $emf$ 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 devicec c0 dpyuo; s(wz9q3tf6ba1d/ 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 devivw)by 5fe9 j1vki e450z1whukce 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 c87 ow+jxe(zi ;ap:x)me. ke5ug-dvcdoil contains more loops than the primary coil5 xcxmig8 d(e:a) u+djz -ko.evw 7;ep then 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 secondarykm;s j3(c2atns )evlhc 5*2/-: ydduu6kw zh m coil dhc6n /;e)uc35v sm2 2*k dt:-yj(zalw uk mshthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power ilj:g*k l*do rt fd03e2s+m.+agm en5znput

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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 ci,9e7:oc rw p. hqet5ywrcuit,

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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 batterh/ ;g mpi h*tl85ace,3uxvcw0gz2)le y of constant terminal voltage. At the moment contact is made with the batw h,c;8 eapm)vhe50l u xgt2c3*i /lgztery, 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 jcpr*-ol74rk an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thr*-rp oc7k4l je 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 induc sezu*znxy)xa5q701( elg+sq tance 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 L and resistnw15lbm ;26yn - sogwtance 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 batdd+9lv: wbh 5gtery. The time constant for the circuit represents the time re+hg9bl: w d5dvquired 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 in4rub h7 udc.l8ductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requireduu.b478 rl hcd 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 same 41dsxs 6o0l.o a7c-3cfjru bmunits 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 supply. On this circu k2j 4abqd-m:wit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply;bd9 tdipez/ ;. In this circuit, the curren/db e;it9zpd ;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 if- nt11pa cgd1ft-*nx n an ac circuit changes by what factor when the frequency ist cnaxf*gn-1d1 tp1 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 voltage across an inductor is doubledp. d30pe. zpju, the inductive reactjp3.p .p0 uzdeance 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 ved)*0fhf b. yssw:jl -oltage across an inductor approaches zero, the induct:-sy0bf f *sdewj)h.l ive 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 conk,tfbjcw2;69*qwm ;lr w iu3j nected to an AC power supply. In this circuit, the currel2;tuw;wk3cir bj * f6,q9wm jnt

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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 frequ.jjkmg , ll9 4x*ml,xsency is tri sk*mxl,4m,x gl jj.9lpled?

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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,76h + bwfodqp a capacitor approaches zero, the capacitive rea7p,6q+ hwod bfctance 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 betweabr. :t2k apc1+cjq5l0x*kpcen the voltages of the inductor and capacitor in a RLC series c ccrlc5x* 1apbk2+a 0q:.jptkircuit?

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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 defji a8;ivc/.lnnkc2,zds1)i a9lrh t *5iqtj, ined 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 ilpxv6,ur h -,xmpedance of the circuit increases if R increases. When is thil6p,, -r vxhuxs statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of yu28ivq8k :6v ze)v6y, emwruthe 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. Tpe,9r3ro . yyhx*3f irny(8nghe 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 capa6y m5l;rdfm7/zjf kj *js4 li3citance both double in an LRC series circuit, the resonant frequency of thdsrl fym 3zjm*j5;lk47j f6/ iat 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 voltage. At resonancf/alvbe1/by(q qqu6a+3,zr5 n ksb :ae,

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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 circuit occurc,vsgih +b ,puj*8(c ow( 9ps-epd(dss when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a u os:7b tx2f(,v-yl aygniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field veay,-vybgo2x: 7 t (fslctor 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 ubqwvahc4 s6k *,vf;pm -l+a0a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of hs*,lwk6m+v0pb; -aqvf ua4 c 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 uniform magnetic field of 0yd,3:xi mwe1q .20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vdi1,:w xe m3yqector 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 avc2ch6 / /wwttrea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes ugn1p n)f5pl+ 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 o : .gvu0qdd(pjn a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chan dpv0(.jd:guqges 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 1ps;3ezls- y2h 5 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 s2/1l dcki ;0jjkvev4$0.20 \; m^{2}$ 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 f gtd+a(o a8q)o 5cgp7jlies horizontally at a location where the downward componen7p58) aaco+ogdq (j gtt 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 rotatd rbzmfs1r t7wb9/u f/gv3( o10s* sbfqtn9m;es at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fsrbf bn3gt smbto0;91r s 9/mzw/(du 7*f1 fqvield 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 50clnn/xum2n7 ) 2 kf+(2ilmbw exkh*c; loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100us/:o sv*p k8zmuj 9i3 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatureh9b*x vvpm:u zk0vxl9h62dp9 . 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 th*xxub06v2p mv:9hvz k9dp h 9le loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 t-yp0fhqvu 2c)urns 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 edzg+ 36;ro2 k k0xnjlv p1gz,to construct a simple 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 area of the rotating coil6,rp;gej+z z0x 1 nk2k3dog vl 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 n cenh;osz3(* pds. ,ka 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 resistance4osduu;e t*c( of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a re2:vitn44vm;4 ryw:dv* dp vo vsistance of 6.00 W. The motor operates on 120 V Ay;ivv4v* r:d d:np4ovm tv4w 2C, and when 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 6.0 W is connyqx( o1 ril7nos*( k.sected to a 24-V power supply. The operating current is 1.0ox(k r(s *1nq.soyi7l 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 powwg/qtsi*/sa ) er supply. The operating current is 1.0 A at full s/ss )*tg wa/qipeed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to tkrl0 7e,w )g i9k;zc;jjp(kt a 24-V power supply. The operating current is 1.0 A at full speed. Wha;r0lj k)g, (wkci7k9e p;jttzt 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 reducl 4l+)p +b/z nnt3aobme 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 transformyn4 ng-.lt 1vher causes 14 A to flow in the secondary. H yn1v-hnt .4lgow 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 neces,yrhqs; akvk- 4 7jkh-sary in a 110-V primary if the 24-V secon7 ks -ak4qk ry,v-jh;hdary has 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 consists of a 500-tu96 ju/a rsx7evrn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is th ves 6a7jxu/9re current 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 transformer. Asxk66rw. :xq oxsuming 100% efficiency, how many amps at 24 V can flow in the secxkxor6q x:6w .ondary?

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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 sshgo,scvs :,g4*, p r)zt *iwjign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?s* cg h,sg,)tsz vrwp4 o*:,ij

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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 primadum*yrzz/0 /k ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pres *zzy0uk/dmr /ent 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 t );jutbu ts8ln: hmfsv3xbtz61- m 4;qurns on its secondary coil. If 120 V at 2.0 A is applied m6 nj3v s;uu)-t q81 f;tsmzbt4h:lbxto 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 transformer has 100 turns and its secondary has 200 turns. Ifizxfo 6x*k t,2d0v9m ni;5rpm th06dxzip ;9 mvx*,nto r ifk52me input 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 s9ym.vx4z vyysud7iv9-j21ta econdary has 200 turns. If the input voltage to the primaz x4diuays my9v- yj71tv.9 v2ry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20x7 kdv4u6leq1ph* b/c7+5 (wg sm ys66hiziwx0 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tc7w7xx p 5y(1bhdw6 gsvems *ii4+k6uz l/q6ho 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 usual8ibug:t 1:t/v nip5n5 d vx;hhly stepped up to 4500 V by a transformer and transmitted through a pxgt ibhn:p/v8;dv1h5i 5un :t ower 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 voltage is usually steppyq g127do 65co4 ro,dww: yljxed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W.w4cq2o g d5l:,yw6ro7y1 jxdo 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 steppefg*rw (;+n zq3qli1) moajba -d 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 transmission1b (j+qr;wo*zqf ni)aagm - l3 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 km8)p;bc;atj j s qd;(rc 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 orp c; jj;() btr;da8csqiginal 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 resis/tre+4sv. ciztance 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 ori / is4vtce+rz.ginal 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- cw vau1b dxnhs4z2h07cf;; v much less power would be lost if the power were transmitf-avhn42;;s7vx 0hd1 cuwzc b ted 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 tgjum qwsq:2/h,zfy59( z(gtn ransmitted on a line with resistance of 0.60 W. To what voltage must the generator output be z(u tmh 9zq( nf5jygg/,q:w2s 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 5.0 A9zhy3r 9fu5+fkyit:hpg e6+p vl+kl :. How much energy is stored in the coil's magnetic :ylk fuh + +rgpe9pz:ht3+9flv 65yik 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 con-fn8)r dc8 kbbtains a 6.0-W resistor and an 18-H inductor. What is this circuit's time consb-b) 8rfcd8n ktant?

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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 voltag.+fall:yasa f9r 5.iie in 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 plac sj 8on1+scoppps+er02oy nw d+ :d)*ved into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What i,yryx2ide 3ja wk1w-6 s the resistance of the laijx2,d a6-yky rw13wemp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-lci* cnejs 1b2 khuvi. 3uq iz90d50j5V ac power supply. What is the peak curren.cjkcz ndj 0i25153s90quluiv ei* bht 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 tonx .hl y-nnvo:b v60:vt igh);)0xcjf a 120-V ac power supply. What is the power dissipated in the j-vbl. y;xnt o xgv:i)h0n:c f 6hv)n0resistor?

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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 0cyov4 8g3kkh resistor 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 resisrqs.4q jk)5a x3ht7hotor 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 ap( c1r9w bayyr-c9ii) 50-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 60 Hz?xc01 ioq ; 48chg7zrwf

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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 8yuy3yb+dru sx zzb523p 6o)xreactance 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 14.0-mmydg )zx.)rd6dr1(wm H 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 necessar w(,drhg6wg.c t xh10ry 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 q4wekk 0g+cvz7 5v5vf AC at a frequency of 20 kHz is appkgvk7 5e+q 5v 4wvz0cflied 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 110-V, 6a 970 evy0g 4i1ga1bvhe9p cyo0.0 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 capacitiv+m 35d*dpw*-xa fzpmoe reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at k2cq48q0zm ma10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W?o;; 5rzmsdr/ cxis5e/z.0fb:g;b wzy6 *beek

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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 capacitor be 100 Wwg8() 3n1wblsvbkm k ;q l+e-k?e8(lk+-kwlwq; bk3s) m vgb1n

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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 ppitjwj+od9vj1 n:.0 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 citoj odl9, a9gk6qsb4s lgv a-+mt:) +trcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive ,+gbtj6tk4 vtga-oldmqasl9 +) o:s9reactance?

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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 coh7 mjc7dge ,-til, and 1.0-mF capacig7-c7,j eth dmtor 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, and 1.0-mjcxkllr:7rkb *;( c +sF capacito :kr7bjs*k(;lr+ xlccr 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 s 7 xaeki)+vn7geries with a 20-mH inductor, what is the impedance at 17x) n e+ai7gvk000 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 con:g p+2( rp6bt/b mzjofnected in series with a 20-mH inductor, what is the phase angle at 1000 Hz frpo:pb t 26zjb/+(gm?

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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 akq 0/1e z-sd+jg bqph/o m8+plnd 1.0-mF capacitor for a total impedance of 100 W at 1500 opl m k/0jgpe/hqdz8b+-q+1 s 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 100y*4ghg s 3bv )qo4jux.-W resistor and 15-mH coil tjqh* vsb yg4x) 4g3o.uo get a total 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 b byr ot4mbjpd+lp.; -yr/ 0z , ajggb57t/3wwHz for a total impedanceypb. /,o a3ty j7bt/bwm;z+wplb5g0jd-rr 4g 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 bq0rpcr 5,c9g ne put in series with a 100-kW resistor at 1.0-MHz for a total imp5q09,rg ncrp cedance 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 capad9i8g:e2lbef citor. What is the impedance at 1000 Hz?gl i:d8 9f2bee

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nepznn1wfr o9,tqeb h :6/; dcf.eded in series with a 10-mF capacitor at 1.0 kHz for a total impedance ofwberfd.p:6,f;zq1 /hno 9ntc 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 1.0 kHz f5iy xemkyh+5mcb;lg9*, y.hnor a phase a+9 .5ixnhy ykym,hgc *em lb;5ngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at x/k-tg6p(sw5 g,ex,ele.db t1.0 kHz for a total impedancd( w 5x6.t/gelbxe,ket ,g-spe 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 12vcd eu.jn4l 0ofm /)2bmm, s4d0 Hz. What is the phase a vmb)l,0sde./ dmo4j cn4um2fngle?

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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 c/oyz 3y3jk)ac 1/9gm n0p5xbv m6tbceoil, and 1.0-mF j/9 km pny0y xo36)c3/zt b1abc5vgmecapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit cof .2kbk9 q 9qhrl3rv6unsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wh.qv2h96 k39 frkurbq lat 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*d4*uv.o* aonyty( tt capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W * ytn t(o*ty d*4ovu.aare connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit conta bp85 jt.u uvhfxmyo61hfl;9f5: 1vpiining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co 511vp5mfpo ;8uuxy hlfviftj.h6 9 b:nnected 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 for a phase angle y 8cl;z*gnb1g3v4dq8au)8fq t poqk* of atpulgdg*zcby3* qv 8 kq881of; ) 4qn$40^{\circ}$ 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 = 2001ftuoxp j4; j:-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to x4; 1tofjju:p 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 0s pkag pp9fgp.x1f3* series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rx*appp1g k.0s9 3 pgffeactance, 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 akf7w6.*f7)3 8iuymalmx iqqf 4jpu h(n AC circuit 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 o:lrt )gogx m5e4omr,-f 60 W and a resistance of 30 W. What is the pow5):gem g,ot lro- 4rmxer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resi0iw*qebpuas 63fgvskc2 1 ;c5stor, a 10-mF capacitor, and a 0.45-H1 0 cqu*kafp sv swe5ic3;gb26 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-md:;5*o lzb ejdH coil in series? oeldjdz5:*; b

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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 ixjkk6e+ ndx-rgj, 7i64 +x zcmn series with a 4.7-mF capacitor for a resonant frequ -e+, j7 kizn6j6xg r4+kcdxxmency 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 inductor for a resonanv4hrqzag k.ea1+ *,d f9r b5mnt frequency of 10e f a,gr+*4mz1q vn9.kr5bad h00 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 3/0d7 haafcbukt *+nk,wpq;uin series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is au7 ab 3u*+;kfhp,d /wntq0ckto be 1000 Hz?

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