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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of+axngi 4 6f:ek 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 statjw xe1g8iz+ml8sa, nxc5;j : ves 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 s dpn6.xz1kr: loops of wire in a coil produces what kind of change on t1 ndxrk.p6: szhe induced $emf$, 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 lg)ibw.k8jj* h oop of wire produces what kind bwgh8.ijkj*)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 phy)6g4i i7 vu 1w)mjn b.-iwwtq )*wpproduces what kind of change on the induce.4)1 jhqitm)7-iunywp v w 6biw wp*g)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 fieley4kj k8w,h5 k:zrj;he cs (*sml*pw-d 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 o m)qy+3th :wdin a conductor will be tt3oh)md+w y q:hat which tends 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 7lp8fog.u xy1 *dcbg: flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewe.guog 1bx 8dl7 py*:fcd 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 hotausoa )pm 2tm(yma), im:u ;2kbc;y1 rizontal 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 vi )muctmo(;mms b21y2: a, );akiytuapewed 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 regio/t3ehj 2of (bwn where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cuw(3of 2jtbeh/ rrent 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 ta0xz je*z5 (qj*icrpo *ble 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 in thi5(z*e j0jq rc i*zxp*os 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 horizo 0m7xrazuhbz7r(rsj78 z, -ccntal table top in a region where the magnetic field points straight down. The magnetic field disappearz,7 7m s7 zau8cz-j(rrbrx h0cs 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 aly) x*bpg n3 p6og8 mwtqzufiw +*1.m,k6(il lnd carries an ever-increasing current norgw1 +yk,m8 tzi (gp. )6in6l*wo*xllfpm3u bqthward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. qcx n.)9g :hfzAs the north pole enters the wire, the induced current will be (as viewed fro:9 hxzg.fn) qcm 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 co 3t /psljl3,j(c kq :7mrq-iw/jdel u)nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pdplqmj,tqe)7lu w- /jlc :3(/k is r3joints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an 5tdadm/ f-) y2 u b7bt49iu.*afhxub zaxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thebzi/. ytad bt5daubu) 9f7u 2m* 4-xhf 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.tc)ncsl puz1ft/)9 q:
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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 rutbx,j/vux5oeya , f+ :acqso;a ; 77an $emf$ 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 fiel hvkvm; v5a+a,om(u4 vd. 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 northwarh;9itkyi g.h 0mm7;(:dsuttb d at constant velocity through a magnetic fiu97.ghts:t ;ikd ybm tmi;0h(eld that points straight down. 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 bar rotates at a constant angular velocity43b3 qc ,u)igg99mc by3dx7i oncbq:b $\omega$ 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 transf6050k yvppasha5 ;e mvz3ig 7jorms

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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 freqdbxua l49-u4 luency of t- ulbdua494lxhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device-)+) :ufh zzzhwiem p3 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 devicidlactz13 /hzy:a po)+t da6 5e 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 m( :knx 5ictjh.ore loops than the primary coil then i5ikj :c(tn x.ht 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 t9wws m*ul:h(j he primary coil contains more loops than the secondary coil then h(jlwus m 9:*wit 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 innu; yu*;8tcvebk)x 3bput

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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 cirzarq iy 2;;+ a)0vpxnhcuit,

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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 connecj:3g pfge+t;i ted in series to an ideal battery of constantgi+f:t;gj3pe 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 an ideal battew8 dxy ix-w(s9.j fxo3ry of constant terminal voltage. At thei8xw.yd9xfs-j3w (xo moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resiha +braf17 *ftstance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectegfx.dl rk-g cdp8/n ))tmy8 (yd 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 connec laa:wsi/cfcy9 d s3dp,o35o+ted in series to a battery. The time constant for the circuit represents the time required for the current toolosdsdy9+pa 3,i w5:caf/c3 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 seri6q7tu erj6p,qm(xz 1pes to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decpert 7q1z pq6ju,6m x(rease 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 units excb 1q ytf)k 6jw(rygn-+hd8 0ecept:

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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 7bs4:zaafy 8vs1o,0ntwm6cl pply. 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 auzgeqy4.yt8+8 bp5 crn AC power supply. In this circuit, the currentr8yb45gtu.p z+ycq8 e

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit chank76ob5,lwv ko7r r zx.ges by what factor when the frequency is tw rkxbvrl6o,.7o 57zkripled?

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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 isyuv:;vs 15v vu.kj k4v doubled, the inductive reactance of that indv5;1sv 4vvuk:v u.yjkuctor

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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 ag*:, pg; ci toygo7eg5cross an inductor approaches zero, the inductive reactance of t; gogio y,5e:p c7*tgghat 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 supplb;g ujm-dt(*3mk)+i ld nito6 y. In this circuit, the currentb) 3-o tgiit u+djkn 6l;mmd*(

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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 6kb2b3qm og; aan ac circuit changes by what factor when the frequency is tripleb2o;abq m 3kg6d?

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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 capacito0ee.x (a:m9 c6inqzubr approaches zero, the capacitive reactance ofc eq9 :(axmezu60nb.i 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 inductor and capacitor )u/jn( i:yw gwin a RLC seriesiuw:gw(/ )yjn 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 R isu yfvd+,.:eLC circuit 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 increaseq pd4g+pf 5pe vx3mez7wit 63*6uol4eql;pi2s. When is this statement trewoum7ep*v5;q3f 4dz g xiel43t q+l6p2 pip6ue?

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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 t w)8h p 2wrwrk58+2 plovgeyn*he circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impf 3csk(sr 9i,fedance 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 series circ/ sc7y4igcinaa7z /.zuit, the resonant frequency of that circuit wai/7zsyi cgc. n/z47 aill

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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 resonance,8w.tl5 cgm9d42z puhu

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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 occurs when;ufcz,y(4s rlr 3(om r

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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 uniform magnetic field of 0 ectl0yfl,::zr3 dls ,.20 T. ,:d0 ,zr: slyecll f3t Find the magnetic flux 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 rotating in a uniform magnetic 8l;v3s8+m jxd oher 2lfield of 0.20 T. Find the magnetic flux through the loop when the plane of s omehvx;lrj88l3+ 2d 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 rotatingqy -emfu8 y; 8:gz 5q--dwgrgb 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 ve wy;gqf-r 8zb: 8-g egmqd5yu-ctor are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced/ovis36c 8wa:u9wvqz 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,sw*p- dvkhq; ht3+lqoil 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 framb xm+wy4 tvh7h3sv)5he with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T h)3hbywsht+ 5mx4 vv7 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 158i2)js k 0r1pb5ew toh 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 arb zq 7f7:v4tsaea $0.20 \; m^{2}$ 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 wingtin/*y4y ) xi;cd+ awt span of 60 m flies horizontally at a location where the downward component of the Earth's*d +tiyc)4nia ;/xywt 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 rom7i9n af(y-4pa tec 6ntates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiia7e m6-4pt9(n cafy neld 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 a2qm. ikky k1d6 cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirq37iv;hlhcjx m+ g): ke of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop0 xnl(k(3rf-3.gp owe rhszz 2,/xlk v is 12 cm long and 8 cmrkvo2,h r(x(z-/3l 3kznpfslg. e 0wx 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 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 consistshc: qceno/elhb : 9by ng. n+(5z-id8m 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 generator with0 a+dwi7utt* n an output of 12 V maximum when rotated 0t +wnt7ua*di 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 gh2 . tfigut-,menerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ob. jr wdn(3p4 l0 +akb.xcd,tqf 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 ha9 tk/s+am(acon;c2 9b(wpoge ve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a cesma p/9 9c2ow;k+tonb g(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 connected to a 24-V power supd ,8d -m:wo6(ra4qwywsdm ( xqply. The operatimdwwsd(ym 8r:(o 4 xd-w q,a6qng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power-.uc xi ed6g;v .ixl)q supply. The operating current is 1..xi.dx)vqc-u ;ige6l0 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 internaxxfwu6 3 1ufv,rg 3.;oj 2ojdyl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full36 3fwu1 ofg ojyjdvur;,x.x2 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 rebf ci+jmsb,m r**6sl + *yt+kxduce 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 cau/10y/ggio l(qjx u+j5 ;ycajyses 14 A to flow in the secondary. How many t5a(jjci y+q01ylxjg ; y/ uo/gurns 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 ebok. 18.ujk q) mtjojf0gd2) 110-V primary if the 24-V secondary has 100 tukt. djm) fjg2)oe 8o1q.k0jburns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary zsc ):)c)ei, u+qshtycoil and a 2000-turn secondary coil. If the cc i+hyq:)zu,s )tce)surrent in the secondary is 3.0 A, what is the 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. Assuming 10q6k a82qd5cigdm 37dl0% efficiency, how many amps at 24 V can flow in the secondaryai83 qcdd dml 72kg56q?

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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 trc)6vt6u7te eu17sckco2 6l o0mkqa5jansformer provides 7500 V at 10.0 mA. The primary coil oper a0v6e6)toeq tu7 721m6jklocksc5ucates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer habysl30sw 043:mpo8s 2mstnslqb* yt-s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prese-ly2b3 s sttssml :s 3*8n y4pomwb0q0nt 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 n4kc+40yn ks/a7p wq/f+vuar300 turns on its secon4p 0kva/s+/y+uncq 7afn4kw r dary coil. If 120 V at 2.0 A is 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 transf 53sf l;(tvvoun.drx 5ormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to b; 5 v (sx.ruftl3v5done

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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 itsulx3 hip9h(l6 secondary has 200 turns. If the iulph 9 i(h63xlnput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tur,ux0k.df 5 kyjns. If the power input to the primary is 100 W, we can expect the power output of the seconuy jfx,5k.dk 0dary 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 volt* cwh.4arg3p sage is usually stepped up to 4500 V by a trsr.3p*4w ahcgansformer 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 6w+ l z;.*vsf px.jb1d)rpqtd:0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance b+)w.dzq dl.vpp jr*t1fs ;x: 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 of2+2 9t1br5vbhj8vwf/ gjh*ev1do stx current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a 1+grvjfwb2vh *t85 ev9th 2xos/d 1bj 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 tou6w+*p uf tcf.;l*u46mbmjurs 4/ wtttal resistance of 0.60 W. A generator produces 100 V at 7mtw t6*/u64l*up+um su.c4tb rf; jfw0 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 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 gb(t jj(2ucp .km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss du2gc tp(. jjb(ue 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 *azl :cwpo1j8 down a 6-W line at 1000 V. How much less power would be lost if the power were transm*wlc:jz opa18itted 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 a,ymsvx:k ;:qpt 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 tp: m ;x,sqv:kyransformer 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 mx o9dacu+ wne4 n86/*eye eh5buch energy is stored in the coil's mage u+ ne*n /wb4eeay9c58h6xd onetic 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. Whaed6g4d1 xyh l8t is this circuit's time con64dh1g dl yex8stant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vol9 1e4rgezkz7j it 6ry2tage 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 *h:skok .r sgx0s9mu(q 4-:0 3veoqtvrmazk;outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistancj0 s(n yohj1/0. fqgxge of the lamp q0j yhjsn.(fo1/gxg0 ?

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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 120kh)ps np2f;r c,iv4u1 -V ac power supply. What is the peak current through tif2)uv, nk ;hrs4 pcp1he 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 connec .ir)1ce;vst/v m*kcl ted to a 120-V ac power supply. What is the power dissipated in tl;s /tc.k1* vcvi )rmehe 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 resi nef *m0m0owc;stor 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 resisqr,c9i nc eq/jr5v 77ktor 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 resist b 1t1 *ot. *y9d69 .uwnipv0jpkljowsor 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)b+ jn3va njp/o 12bss?

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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-v 53c/3vlsoz-r lraf7 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-mH coil have 14.0 W of inductive v,v09a3v jty y7h466j6be gjnkicr6z 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 W of inductive reactc3bpxeabt vpdw(g )v:v l7d 7)7rwu ;1ance 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 frequencyn ,:wislx8joq1t: vz ;.yv2e m of 20 kHz is applied to it njv,qmyi 1;.z e:28 lwvo:sxt?

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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, 60.0 Hz sourc2gj(gjcr+zky w. 1 c . rx46ewzlws:+ke?

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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 at 1/ tc0oeq f;)4fcfh3gk0 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 oif7 w2 nevp0i0f capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 5tj8q7kgsim 4 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaci o*wzbg)s p)gx0)tet 1tor be 100 W b*o t 1swz0gx)gpt)e)?

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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 through1 btb1vrzo; hf1jf e99 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 zs1 kkrsu; h-vea4v in6cs202an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1z k vsein1k2-r2a;su6 0s4 chv0.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impm :gru c yd42(3vof r+*yxz.hhedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sery(v.zu+rfym4dh*3x: h2gc o r ies?

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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, an)l3.q.dgh8t 8o(nzqw bkx4nea0 ) d vxd 1.0-mF cne dtk)4xl8a. 80vdohnqxg. qb)(z3wapacitor 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 2j:40fyv o 5xx;1 zocwyla).ni 0-mH inductor, what is the impedance at 1000.loyy ovfwz):1ax4 n j0ci;5 x 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 in8fia4/7lrhd/ dz1bwb series with a 20-mH inductor, what is the phase adlb/7h8 r4diaf /w zb1ngle 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 1.0ua*cwn4l(6v o -mF capacitor for a ou( 6vlnc4a*wtotal 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 igxuja6jsd l;yv64vx1 /*x2k in series with a 100-W resistor and 15-mH coil to ge/ a4xku66iy*v v; xsj2g1jlxdt 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 Hz for gqni(.: m0cu uq95mxwa total i: 5 imunuc0qqg(x9mw.mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kq9l*x+nwsgu5 v *2m c69r t;e 8txnrsvW resistor at 1.0-MHz for a total imp nt9v5n8srmue6tl g+wcxrq*x9 *s;v2 edance 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 capacito9 a8mcgfns)j:r. What is the impedance at 100s )9j c:gnma8f0 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..oh b2lw9rot+(tjg( ew /l8ed0 kHz for a total impedance of /2le8wbwog9. (rtho d(letj +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 withg9)c7oc jgx 9m+gs4j1ue b:vrv/ja.x a 10-mF capacitor at 1.0 kHz for a phase angle ej+7.jxbrm:xjv a1vg/)9 4 sc9gug c oof $40^{\circ}$?

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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 v.,r lsn ld7)uv*+vdj with a 30-W resistor at 1.0 kHz for a total impedance of 45 Wr 7ljvnuv.)dd,s+*v l ?

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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 1 vwj,t/n 3c7pz za::z xm1vu-i20 Hz. What is the phase angle v7t,ujwv/ pizmca zn3-:: zx1?

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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 10b26g-ijaz-6 rnjv ony7ys.u. 0-W resistor, 20-mH coil, and 1.0-mF capacitor are con aygbuz6jn-- i7j 6 r2syo..vnnected 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 consgz*uo5o)m u9nq );s wfists 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. What is the rms current in the cwuo;zg*9 ) oqms) fnu5ircuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W,/ 9x ipgl/+kfk and an inductor of inductive reactance 30 W are connected in series to a 110-V, pkxigl /9 f/k+60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 55:xp48pc m qsfhw6a1u2m:g 7tjcb0nm0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tojc a8xcbnpmup:6 wstq20fm hg 1:m574 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 phak-+g o* aly apj(-bzkvwi(+2*fhue: nse angle of zog -p(-vf( yk+hi2ujb*al+a*wk:n e$40^{\circ}$ 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. At whaaq9vriw r,p 3uzu-m4q 9js(b/t frequency should the circuit,urbj q/ w9v-pu4mzrsqa9(i3 be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in a-mw)v9v ro eq9;d a4hbn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to 99ed4 ;)r bovmw -avqha 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 sk96pr8dj p/aAC 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 of 60 ;t)+* mkru7lxd 3 ijlkW and a resistance of 30 W. What is the3mrxk7tlj+iu )*;d lk 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 seri /fkh5 uavrk)o58f-dkes RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wk 5au 8/rk-vk) fofd5hhen 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 r:mk t+5/lz.fnycti s8) ;bzy15-mH coil in series?fb yzy ;z5rtc.8sk+nm):t/i l

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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 serik ;ha,u (tv 0isj9gp4fes with a 4.7-mF capacitor for a resonant frequency 0;hfi(u p, tkj9gv4saof 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 resonanth)g 2oche9txnd)86 4m.. w)r nzpf vhc frequency of 10tpd9ch r2)v8gec ) zfh.x.6om n4nh)w 00 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 and af .v6 r.ax 5 y)hcq ybqlpu1se,+/fzrb0w7h/a 40-mH coil if the reson.vxhhpef q0,bc.rluaz +16syaf5qbr) 7w /y/ ant frequency of the circuit is to be 1000 Hz?

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