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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://autodiscover.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://autodiscover.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 az 036pcxnj zpu+i(a;o re units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statessze+5hrslaz:*21 (a;deo ij s 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 n qtnt- sl,da i//sde1/8-em(a9 drocwhat kind of change on the i/toc ,a1md8(t-q/en9d/a s l nr-sedinduced $emf$, 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 . 1 ioijnefqoqj rz)3svq72)/magnetic field through a loop of wire produces whatqo i7 q).v3)1rj zn2e qfjio/s kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on tha22tn (i. n 8l znhci 6op7c9om)*moiwe indu *2p(8 n2m97no i coni)hwaiz.tmcl6oced $emf$, 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 gv 3yl2eyhl,z)4o-(jcrzfo ee *bi ./ magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the di/(pb)ddox9 :-u:;qmxzcdlg1azw, + g e tr(d frection of an induced current in a conductor will be that which tends to produce which of the fo odx9:,mb:etdr(w( gp/;z1 ) -ugzclx fdad q+llowing 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 flatra k2 fc8t*e;p on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abovepf 8;* k2craet)

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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 hel,29k( cgghz/ yjcdag0d above its center with its north pole pointing down, and released. As it approaches the coil,dk( ahjzyc 2ggc,g/ 09 the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the ma oc7q,bi*( vx -9masaignetic field vector points9vc*iib, (-qso ax7ma straight up. The magnetic 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 level table top in a , 6m *onvajckof 6-)7 *9lzhxsapipf6region where the magnetic field vector points straight up. The magnetic field suddo fm 9,pz6j7 i6aafno)x*lvh sk6pc-*enly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a hel,o(w1s f3fm orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenlyof,w l3emfs( 1. 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 ever-increasi7:dr8 yzecx i8ng current northward. Two coils of wire lie fxz8e8 id:cr 7ylat 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 thx mgdat;2cti+j3z( 6v e north pole entering first. As the north pole enters the wird+m; (jztvgxit236 ace, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angulal)+ q;fuaqu q;r speed about an axis whose direction can be varied. In f+qu; u; q)qlaa region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 wiyji;* chf .l9k,yx;u8p0el.5 on bxmb re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or * ceibxlk ,5 9jmx.8p.fy ;lyun;0bhoientation 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.9l) on*uc 6 b 01nq17jymaex,qb yhj-x
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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 thayyf ooc0, xl+,5+c(dsdyhi d2t 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 fie3fw1oiu7qk1/ e a5*ja7 padic nc-gl /ld. 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 , j(qquw a+ppw+ :pjo+moved northward at constant velocity through a magnetic field that points straight down. Make a a(:j+owp +p qpqj,w+u 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 f;*uskn pz*niwa1k/h7 : j29ze ia*j frjsf8)rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transu d. zwdwbn(1oo,v; 2hforms

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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. kk3+wr. jzfk; The frequency of the3+ fkk zr.;kjw $emf$ 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 dev8rr2 isu*. bhpice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device .593o:uizi quovp:c z 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)/5(r by tyo6 dzmg(n6*lyh eqlq,l2u secondary coil contains more loops than the primary coil my6/* (u,lzby ylln)2r q5dohg6 qet (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 primary2y- m.ux f-ho e;4-pzv pvlcg+ss:n/ o coil contains more loops than the secondary coil then it islsvf/ xcy -ovp4guhpnz+: .oe-;- 2ms 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, the6llph8 b*-xoc blv40s power 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 resonanktj6 ikf *on4;b-fk5l t circuit,

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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 tya6 zmb 2d-ho1o an ideal battery of constant terminal voltage. At the moment contacmo6- db2ah1yzt 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 aref,nk 4f4u n9m or-q-je connected in series to an ideal battery of constant un9 ,no4kmf er-q-f 4jterminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an( d6e by5wgt2d $emf$. 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 connected toa1j3vfj l0 ( r;i-hpn8k14au d/pmtrq 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 ing1nyd cj26lf7uv79 i2f n yu8n series to a battery. The time constant for t2d 17il8ffgn yu 97ynjvn 6c2uhe circuit represents the time 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 indwn33 *fo4)iysed gc.xuctor 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 required for the snxo4fi )wge3y3c*.dcurrent 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 unit s z cuap3x)1je4do) 3 8xjtt3 ;n1h4apmup)mds 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. 6 v vlzns*9l5y 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 power supply. u8xu q-* se/iy-s1 wa 1pcjx/hIn this circuit, the current* -axe/qju181i/ su wxsy- cph

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor wh7it3 /ibaig, xen the frequency is tripled?ig 7aii,3xbt /

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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 vwd+:nh toql kj*sm.- paa3oby3 8gb-) oltage across an inductor is doubled, the inductive reactance of that inductor 3aoylo.*b m) t:ps-j g 3akqb-8h+dnw

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches (dqr/ v4+,cum 5n3io59x (tpyyrzzgl zero, the inductive reactancz ntdl qi5y+ /5rr4cu((9mo vzgyp3,xe of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this c (hu.- zx2 u1bvrqwv,q 4.xnznircuit, the currenxr ,w nb2u.nu h4zv(1vq.xzq-t

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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 j l 0ybjxhj h5)1-7 r4;prbjgvac circuit changes by what factor when the frequency is tri)h14ry l;jvgxp07bjj h5rbj -pled?

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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 v,a;p:y,doy ic;ioba q( kjz*;oltage across a capacitor approaches zero, the capacitive reactance of that capacitocka;;j;o(*o dz:,py, a yiibqr

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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:qlja*j :p( j m70guuw the inductor and capacitor in a RLC series circup( u j a::umw70glqjj*it?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an( (j.fk)k mnwvobz4b5vbqq9 5 RLC 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 impedanc4fs4 hh6cnld 5e of the circuit increases if R increases. When is this stateme hf4ldnc54s6h nt 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 the circuit increases if wfl,(;b n x bc6.;gcvp$X_L$ 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 seriew.9/p/afan i p ke0pj9s circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubb8dn ;b/oqap06m *:5obmmk eeqfxz4 p i7g:i8le in an LRC series circuit, the resongdp0 ae o mi5m/kbq*zb x:6 7ip;4m :enf8bqo8ant 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 by an AC app2g(firn d 3zz v3:hk,flied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui,tf,-9xch fkxgfb88ct occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 k+;fq4dj-hb yxy1x( nn*r3 i vm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o1dyqr-xnjf ;x4 3*kni+(vy hb f 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 ma4r n ii8;8tdyi21kple 7gwk,ognetic field of 0.20 T. Find ;o274krt8k,ig1iwl ni 8p y edthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.61p ufbolar3 a-ahw40 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 magnetic field vector are at an angle oorl1puhw3 6f ab-0aa4f $30^{\circ}$.

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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 vfoyr y8 .t3 jwy47eczd.c;uad+4)3g ufgv .mof 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 from,p,15 bimcqzr $4.0 \times 10^{-5} \; Wb$ 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 wit a3pp85ma ,kc,fw)o sl n-u.mnh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is appliedn mo8 aw5f upsnmpk-cl ),a3,. 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 atmu:sh;4 cp4ar c 6;cqrea 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 a-l2:vzi/vyx, f1l yhxnd 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 wherzqpmx.yf8 ;z5e the downward component of the Earth's magnetic fieldz5.m;y fqxzp8 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 thatve2vg4:86jjw3vo0jsqt ur/ p is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whijwo36pu 480 gq :jes2trvvvj/le in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crul j+9dxbgy -g95o;i1d)xqf ioss-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 consist,nppk/ * yryz( 3i0g wgkt7(els 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 $emf$.

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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 armaturdvpkky6e7 4,px+/qvj 4o6wwde. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. e 4kvpwqxjy w 6p+ 7dok4v,/d6If 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 consists o,cp u p.za:6q*y0 godjf 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 generas (ae0o:odv*04jysmn) 5ve rm tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field o0moj(am5r en :sodse0v* y)4vf 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator ae9thn1i1r2 pwith 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 of 6.00 W.zyu e5,6ba, wm 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 resistance of 6.00 Wdll:49( oxaly2h4hz h. The motor operates on 120 V AC, and when running at full speed it generates ah la42xdz(l :holh9y4 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 intern- bq+wk r4yb;nal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start ;byrn+4kq- bw-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 cosu(tx)sf9dr:5 92d e-ac:yc zre q4ocnnected to a 24-V power supply. The opedru : o:d2zx(ccs-c9)ef aqrt sy59e 4rating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thzbrjsm )id ;:1e operating current is 1.0 A at full speed. jb)drz1 sim;: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 ne+)swt q2y sq-ueded 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 transformg4yrfaw.p1 4mer causes 14 A to flow in the secondary. How many turm 4y4pafw rg.1ns 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 necessatl 8;sdz8 un1ury in a 110-V primary if the 24-V secondary has 100 t8dst8luz1n ; uurns?

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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 coiuhiqr x3 5e(29k ,tsiil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curk5i qh ut(e9si2 3,rixrent 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. Assuiqi rl;+ t2,wjming 100% efficiency, how many amps at 24 V can flow in the secondary+r t2w iq;lij,?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer prh2 w+2jerlis0 ovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doesilrh js +2w20e the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 66lyc61 y4y(bqeywa v,0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tob,eay4 6 y(l6q w1vcyy the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sk5td lvb.v (3+ggw6hh econdary coil. If 120 V at 2.hltw3.bghv + (gd5kv60 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 transformer has 100 turns and its secondar 9ujg*k gei3f1x 3osr/y has 200 turns. If the input current at the primary is 100 A, we can expge*k i/jo 3 1srg9xu3fect 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 -+u:cb9fau di and its secondary has 200 turns. If the input voltage to the-f9u:aidcb + u 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 seco6mg6r3 *ma ofp y(8oynndary has 200 turns. If the power input to the primary is 100 W, we can expect the powgoa*6p fm6yyn(o mr8 3er output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Th4pc1ku:f-gg e+ c)pkce voltage is usually stepped up to 4500 V by a transformer and transmitted through a powk+ )ugf1pk cp-cg4ce :er 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 4cu4(i; od :ab*/k1sd cgc1njzu m ss,current at 120 V. The voltage is usually stepped up to 4500 V4;* ims41ua: dcgj scob/z( c d1ns,uk by a 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 120 V. The voltage kn9zazp33x pv/c i.hp 99uc/tis usually stepped up to 4500 V by a transformer and transmitted through a power linxv c3 z pu/k/tzh i93.9cap9pne 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 6 5rqm:kxx cy8long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy q 58rkxx:y c6mwould 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 kmrc:)nok. khj6 lbehdwo9,1 - p long has a total resistance of 0.60 W. A generator produces 100 V at 70k,h6.n bplwhdo)9o1-ec j kr: 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-W8o4 g(ewk0egs line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V inste4 k08e(sgo egwad 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 9zma1 1zg xlw6V 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 transformer if the power loss in transmission is not to exceed 0.010% ofwm19gza6lxz 1 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 enn -s:kd+b xik-ergy is stored in the coil's magnetic fiex bik :+-nk-dsld?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is t+ns;/lf0xz mn his circuisl /xn nfmz0+;t's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit -op fy2eqf6, + kkg z0g+v4*2x ydodfrwhere 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. Whaqdp o9 k38n;oqkc-21;rkkxjcw8cmb cp h:/)bt 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 placb;y.wmg66c wied into a 120-V AC outlet. What is the resistance of the lai6wg6w ;.mybcmp?

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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-V ac power supply. What is thedr 9lw(,bpc y9 peak current through the resis b9rp,ylw(d 9ctor?

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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 connected1m -yfyra(c7dq5yw sx95 c6z /air3h e to a 120-V ac power supply. What is the power dissipated in the resist3d a 5a(5-y76yhwrrmf 9 yqisczx1ce/or?

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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 rekvjd: tk*yvci8oi 5/+r8( kctsistor 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 raq/ 4zv +miu)nesistor 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 resismij9:w cw8/idw 5g7o)w*h1 +hvvie cmtor 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 ahrt3vr0u +)c; *zavn+9lfuk u 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reacv .gif19h w3ectance 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 ce/qvqj460x f a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 107u,msjf5qju1 +s ugf*ak0 2sz00 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 inductwd /+z.(e gh4jz8 wqduor when 120 V AC at a frequency of 20 kHz is applie +wu hedq 84wg(zj/z.dd 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, 60.0 Hz soxfl x 9;8pep7iurce?

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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 jw6h z2kpv ju2 hd.(2ma 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 capa+e *3rtspwl,p9 ,a tnjgi)9syal a(.b citive 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 a1chul6 n ,hl0pd-3g ms 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capac gzo2o8 wg9il/itive reactance of a 0.010-mF capacitor be 100 W?wlgizo89 go/2

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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. /d ilf)-m(gg zw1ciu b;q6qo90 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 acvpna;c7;a zi 1 series circuit with 12.0 W resistance, 15.0 W indup i1;anc;zv7active reactance, and 10.0 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 impedance *uhelr+ttc/n, af r+5 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ce/ratn ,+rhflt*5+ucapacitor 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 cor *3cn :m 0x85sx8dzyqr qinq4il, and 1.0-mF capacitq5mrq4 8cns 0yix*x83q rdz:nor 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 p9td1fmb,yt vwy 4z2-n6j9nya 20-mH inductor, what is the impedance atd6jy9nbn1 9tp,zm4fy - yv2t w 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whar,uv440oe8q w b0 euxmt is the phase anw0m 0xo4e4rv ,eub8uqgle 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(fxnu )-y6gng .0-mF capacitor for a tot g( nxgufy)n6-al 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 a etj+ j 4jcg04 h4vtbe2dm:p3a 07ugvu 100-W resistor and 15-mH coil to get a total impedance o 3ugp tvjbm04tv2cu0+ g e:7e4 4djjahf 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 pu(ceobjq ii+zx r 2:b38t in series with a 450-mH inductor at 5000 Hz for a total impedance of 400ic:xb j+ei823 r(bqzo 00 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 resistor at 1.0-MHz for a t/gro y16dnii,2 gs( kmotal impedodk,g i2ns m1g/6iy(rance 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 caa-w1,3e)ig j/l uu.7 bqqsk fie o*/yqpacitor. What is the impeda a/3uliub.1q , 7i)f*esk /egj-woqqynce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with ut/ tv62w3hez a 10-mF capacitor at 1.0 kHz for a total im/ vezt236thu wpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 knc5j,ajw qp .d:d8t) jfylv(s so2: o9Hz for a phase ango92 tqjldn(5sjjp. w y :,v :8odsc)afle 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 1.0 kHz for a tota 5),nruje) u3yu apu:dl impe u,ru)upuadyne5 j) :3dance 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-m)y q2bhgrp;u, npj2t acv/)v.F capacitor at 120 Hz. What is the phasec q).b); g,a 2phjtpyr2/vuvn angle?

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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 resaa (ufh g5- sqlv-x9p3istor, 20-mH coil, and 1.0-mF capacitor are connected in serievu-sh-a3qx(pf l ag 59s?

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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 consist5 romnz+ ;vg ):ocr6mzs of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60m zgcr;5on :m)6rovz+ -Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 3d/ xkz* a93q-bzf ck-:bv0qxf0 W, and an inductor of inductive reactance 30 W are connected in series to a 1zdfzk3a/ qf c - *kxbvqb9x:0-10-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 containing a 50-W resisttt xv jmyc2 nuf-essh,0ky;q(6g 6ij11 uu :6lor, a 10-mF capacitor, and a 0.45-H inductor, wheu;u:jq(6tt e6s21hi1 - 0ycsyugkjxn6v,fl mn connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W v/w i u s larwbp;)0pn.*uz/9dresistor for a phase angle of niu/ pr w.dv;swu0az* 9b/ pl)$40^{\circ}$ 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 = 1cyv tqvos .1hs*ic382 0.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thecvcthq1i8oy3 *s2.v s 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 circu ro3lcm;dfs (su/33b d ,kyu,mit with 12.0 W resistance, 15.0 W inductive rfc 3y,3mb,m /r uuol(ksd; d3seactance, 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 gufju2)i2s:, ge*eh if ( kjr1circuit 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( .x)ylczul )w impedance of 60 W and a resistance of 30 W. What is the power fyz) wcllx u().actor?

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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-Wra8jhkcqb;-d k /b4*l resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe/8;jrc -bq la*4 kdkbhr 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 capacito,i)t/x polp f+r and a 15-mH coil in series?lpt/+op xf)i,

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor3e xnlf 58d:p;i 7 :ef72yddnwkpvgt7) nzg-a for a resonant freque fwl ;i -d3a gyekpdng:t7n58vx7n ezpd)f27 :ncy 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 sehutu v +lp 84o3wi: u d.b0be)3+mhpqmries with a 3.7-mH inductor for a resonant frequency of 1000 H d3b p+0.mh48mph vleiu3 uqbo+ :tu)wz?

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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 and1k 3ggvr0ku ;a a 40-mH coil if the resonant frequency of the circuit is to be kg;3rug 01avk 1000 Hz?

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