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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 o ,lyi*mreiy :iw3we./f 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 induc)h,- t58vcinf,ny 4co +gj keotion 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 ofa/qkfpb pdnev1 5**/s wire in a coil produces what kind of change on th ae5pnb/1 sp/*fdvqk* e 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 througqs33rl4c0 8e)jjd jsu huy5;j h a loop of wire produces what kind of change esj j35d l0hu r3ujyjqcs;)48on 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 pro90,)c xgc 7yo9 y(ysunig c6whduces what kind of change on the induced7yowg) c u(iy6sy0,h9 gc nx9c $emf$, 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 from6i19 .imah vp*d+nsx.y tm cl6 a 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 direction of an induced currenjth m.uh*n/q8h0 nj3w4 ewx)ft in a conductor will be tha0h.m4w/f* eqjt) xjun3h 8hwn t 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 flat on a horizontzvc owj- tz+7mow5f65al table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fz -tzw7 6ojow 5+cm5vfrom above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abg vyvq9o0d*1h hto+k) ove its center with its north pole pointing down, and released. As it approa+v o*g )ht1h0yvkodq9ches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where tepldk ,bu(.ax6 iwq6c,,v ol; he magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in ckwpx,oevld; . (b,aquli6,6 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 ta b8o 0emnx9owbw 42uw8ble top in a region where the magnetic field vector poimwe 02n49ou obxb w8w8nts straight up. The magnetic field suddenly 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 horizontal table top in a regioe n(0u zcimsxv):2y *zn where the magnetic field points straight down. The magnetic field *zeu) sy n x(iz0cv2:mdisappears 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 4vkfm*598s1qcvaw 0b0qx wmdtable and carries an ever-increasing currw10a cskbd wvq4xv8f q950m* ment northward. 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 tijp g n ld0ao6z;dt360lvrl-/he north pole entering first. As the north pole en6jrgvd6/ -nl p; lot0d3al 0izters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who arjq6q5 -iy.rse direction can be varied. In a region where a uniform magnetic field points straight down, what.q yrq5ri6ja - 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 ang0b sbmbrg61cky, vppv8/p d95ular 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 of rotation i,5r 1mk gsbbvp v/96cbp08dyp f 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. .6yf;fflaj e9
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an ). .bxz2,wd/kwabyr /ifh r1w$emf$ 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 magnetic5(mi5 73zgh(oj fy c ba7ms;:x:9i lk)yxlovt field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (orient e(mdb.,r8mx ;ystot 4ed in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inds t,tmo(8;ye b xd.mr4uced 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 s 8q0ct kpnwyl;ma1.n)1l(tu 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 s.u5z-aqaim-n p-b k5transforms

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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)fm zven 81:;nwddyy 4z3eal1xtl74 e second. The frequency of the fmd4dnz xz3wylen78 :ve1tya)1el4 ; $emf$ 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 use3gtmm-o v8 y3c80 arexd 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 tha+ 92ebocasfdd qz+ ad u/;cjs; 66nom0t

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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 se:k2qw.p0fx d4pyje*ro8c / m dy8lkw. f4i/sxcondary coil contains more loops than the primary coil thw c8:/f28 kdp .*yox4dkilyps4erfmj0w.x/q en 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 secondary coibuuerl-4(di6 :c w3 vil thenu l(6u b- vcirwi4:d3e 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 inpuz7upnv ,,stl;t

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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 circu-z(;4 unt mhjmit,

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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 connecte pq zo6g*i*i 1wwd6r:sd in series to an ideal battery of constant terminal voltage. At the moment cont6d1**iqz og swrwp6i :act 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 q yy k 6-,hretg0b4 e2e9pkcp:series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volregye6ce ,pp9qh- k40:2tbk ytage 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 inducj- xfy5et-ex8::lxg utance 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 ex najir0m:j y953hm z 642helwith inductance 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 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 t(0,+ifl e b1 3p-zia cby1khu:thv/tro a battery. The time constant for the circuit represents the time required for the current to rei1r+hbp 1f yikth v/0c: 3lz-(,u atebach

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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 inducfyzkvy)1+jlxj)gvb 7 on(6l 7tor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constanzkx1j glvnfjl)+) y7 7(6 yovbt for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the followinghr d)g:c1. n5dbg6udg have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to 2nede8*m5r) lxpz;zc an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected 7d. )zm; p5htsgqaa-c to an AC power supply. In this circuit, the curren7-)gsq phactd;mz .5 at

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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 circuitpb+mcw s3r-x/ changes by what factor when the frequency is tripxc3/-+bwsm prled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the xvny*d-+ 0 :vc(dj uhh;8oyi9*k60c oi alzyxinductive reactance of t;(v8yozcj xo 6dy0dyhn-+0i v *:akluc*ih9xhat 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 voltage across an inductor approaches zero, the wc9e.k6w is dg *zot0ldppfoyxp:9q) 2,7v e8 inductixkgc,l 6e)ezfop*p 8 s.9dwo 70dvpwit 92:yqve 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 connected to an AC power supply.)je8:m) ha93ciekd zp mlh;d: In this circuit, the currentzlek8h3ej;mac9::imp h)dd )

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance6civ0 ;y phg9h in an ac circuit changes by what factor when the freque; 6c v9ypigh0hncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the c,) s2gs9 uxxclqd:au q+5 wbw5apac :c 9xx qwl,sab2uw5q+sud5g)itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the indu-gh3g 07p.j ctip 2etector and capacitor in a RLC series circuit2g -ht3tg7ecepj 0p.i ?

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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 it7etnoix (. t.s 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 Rvbqbfk 1; ;e8y increases. 1k bqye;;f b8vWhen is this 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 the circuit increases ifjz/ bytty6qkds7 h)4t,3 ynl6 $X_L$ 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 cl cf(6dq63t0hpvl+ wh *p5ds(z :npc6mbcv3eircuit. 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 capacxu+ih.bn 646-lzvg7nju f0pfitance both double in an LRC series circuit, the resonant frequn-hnp6gf7ji 4 uf+ 6v.ubzl0x ency 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 drive5ok1pe o wrfr* dm,)(ln by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit o0c+un 7pfi+h)b obja+ccurs 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 uniform magnetic field of kwgo .0bqw lplja7 dt4u34jm8 tb (gvqn( g)4-0.20 T. Find the magnetic flux through the loop when the plane of the. uj qn(jlogq)7g -vwta444pkmbtb0(ldw8 g3 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 fiel3l lo0,3 ml;rfkz76ete7d gd ud of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetio;km3 eulg, 3rlzl770fd edt6c 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 unifu6 x) /ao1osy gnnmf3xhz,)n(orm magnetic field of 0.20 T. Find the magnetio maszxn)3o g/x61f,(n)uyn hc flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adsb1 r5fq.vr3qh +okkm); uaz/justable 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 changr51f2eqonj t aw06d +-u1zfrses 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 7tyn z;w. ziv0square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of tnz ziy; 7.w0tvhe 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 withwu(g3hb)qf9 ymf 8r 9r 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areanms vq :qc).,g $0.20 \; m^{2}$ 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 horizo-6 wqcz bz1sh2ntally at a location where the downward component of the Earth's magnetic field iszsw qcb61h2 z- $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constanl+6( nmrs:kh tt angular velocity of 2.0 rad/s abou +khsmr n(l:6tt a vertical axis through one of its ends while 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 loop,i2mfn j*ppbi-3l.xmxb-3o bs 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 100 turns of wire of area vlb7):lpkzo 8 pj0ym6$0.090 \; m^{2}$ 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. Eachkht )09krlcj 9 loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perp0l h9j) kkrc9tendicular 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 turns apws d q6ny2:8/yl1k xof 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 genj56qbmg. or7c1w*29vzazsx eerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I*z 5jzw 7rs2e1cm.oq ba9x vg6f 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 genewq) (voqcf:b/rator 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 of 6.00 W. The motor hf:fqz*2 . gryoperates 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 tj3+o fup,4asqn2y n6ga ;)do motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed3p+n 4ooj)fg 2t;naady 6q,su 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 connected to a 24-V power supplbl; z5m+t2f3zrpbnvzw6o9fc;xy:* c y. The operating current is 1.0 A. What i f5rcflmtzv9cpxzb w;32;*z+n yo6: b s 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 power6.unkr )fryur/jh y n9mh-k 1* supply. The operating r6uyj9rkur -nkh*nf1.h)m y/ 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 poh8z:7:e jm3jb ejapyr -m/cf jp3x 9a0wer supply. The operating current is 1.0 A at full sm3 x- m3ra a bpzpj0h 8/7c:e9f:jjjeypeed. 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 needeo1yi578u k ra8(ynfh nd 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-turcmz, ;go depf ;((7qufn primary of a transformer causes 14 A to flow in the secondary. How((c7dzo; mf f;epgu,q 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 u6oq gt:w22;guuk8 ,k mbdmf(are necessary in a 110-V primary if the 24-V secondary has 100u k6,fk b2guomq:m2d u(t;8g w 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-turn primary co0 :kat:.n. c k, p4 nxh5xzm0y-euiepoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what iitx: kx .ay4moucpn peekz5:-h0,n.0 s 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 100% efwpjz6(w a hm 9)4hozy sr;e10yficiency, how many amps at 24 V can flo4y 0wjpor()y eas;h6 wzz91mhw in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7uo-3 mjis8ny1)d oc7i500 V at 10.0 mA. The primary coil operates on 120 V. What does the primsoymj 3oic1)u-78n id ary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itx8s/qndhygq gqh1 )6-m m,il neut+lkc4 3+f1s secondar) in1gxqtn6 +kuf+/hes- ydglc1q 3mlm 8q4,hy coil. If 120 V at 2.0 A is applied to 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 sma.b4r+npx ;j econdary coil. If 120 V at 2.0 A is applied to the primary, wh4.prnbx amj;+ at 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 transfor b57f foo,x+lgmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A,,5g7 xl boff+o we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If kz 0 x75 vd+ngpok),xxthe input voltage n g,p)70zkv+kx5o xxdto 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 transforyzoi6egx a0j8-pf9 3h mer has 100 turns and its secondary has 200 turns. If the power ini38e 6jp h gyzf0o9xa-put to the primary is 100 W, we can expect the power 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. The voltage is usuallbj x-,5r 9lzmf5;h,cbe2hqxay stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the semrbbf5,x j, 9h-x zce;aq52hl condary 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 stepp9tokq, )z2 h1l z51 tnou-tbgzed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percun-qzt1 ,t9 ) 51hlt2kzoo zbgentage 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 usup(w4uor9of 2l ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentaolupwfo24 9 r(ge 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 kmz5k z+2 o8gkew 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 o2ze o5wg+k8z kriginal 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 resistance of 0.60 W. :lxtg1a9 veez 95,c6co(gbj gA 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,b ae5g(9 ogt1jec vxzcg:l6 9. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 100q; g v1zhnm-tn)6 +pcn:d9fah5a cf : v-wdbi50 V. How much less power would be lost if the power were transmitted ataq5fitbdhvdv5-:1-wn z; c hncn+g9 mp 6fa): 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 -,)t c2ik7 )ajzdn agrV 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% of the original pojzt a,-2crd ga)n)k7iwer?

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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 b+1 lqt5)yolz of 5.0 A. How much energy is stored in the coil's my1tol+bl)z q5agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is b,j*na1c a taj47lpzyz- ew0 7this circuit's time consta aat4j-j,zb17yenz7*al c0wpnt?

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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 g(qece+2+n y ocircuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 128o rxd4 5zn:3a;)cpvc pgbv9 krwd9- i0-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 i gt-q *(bscl-8fg c/mvnto a 120-V AC outlet. What is the resistance of the lam -lgt/gq -f8c* bc(svmp?

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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 : 6fbt*u2;fvg6zywwd 62s rdiis the peak current t rv bfgs6*w66 t2i;wduzyd2:fhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power b25epnzi r6j4 supply. What is the power dissipated in the resistorjz5 2 4r6ipbne?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isdg2pd/xs0 kmof3.vn2 p l; p1-u/klkt $I = 0.80 \sin (240 t)$. 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 resistorj ehf(1;cxhu4j /pb n5 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 resisthzur8b;b8)y lor 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 ais ;pvl m4a 2t/ubgwz4n7,b *j 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-m, tgsef 1 nt;v+liv8: i:q2terH 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 chr 0o73+p fqf7 t1*qtbkx ejy8oil 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 necesswd ozo ,svz ay6t8oa(p9yh w6/2o89s tary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencppi43egr,g pi/(b 7k fy of 20 kHz is applied4b73ggpre/p ,i fp( ki 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 1,8)4u 3nrn*c za3aop )emlodtxzz5 n610-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactancepna -;x ex: gp,spoa55 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 cap iyq j:n7g/vf9acitive 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 1200 W x:p,dqd.11 r3z slgc n,fy)aq?

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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 capacitorq1kyzk6y/ x b v9e+d7f be 100 Wb+qvdx/97fke6 zyy1k ?

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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 g53krfq 6k3cjHz 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 circuit with 12.0 W resistance, 1 hp4l wdttjp*g ;;y98d yp2t*i5.0 W inductive reactance, and 10.0 W capacitive ret;9l;hy2j4ty pwdi *gptp d *8actance?

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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 nvkec;;6409h/4knx9zo elmjh 5zqge-mH coil, and 1.0-mF 5 no;mgneh;9kkv4/j6 x9 e4qzz ch0lecapacitor 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 rfw/x-b1c2 a 6ce:de iga-m 1haesistor, 20-mH coil, and 1.0-mF caac- xac6afehi2m e:/bg1d1w -pacitor 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 3lp9f uz6c wy+with a 20-mH inductor, what is the impedance at 1000 H9w+yc3 6lufz pz?

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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,lq-7qv6+j8 clm6frs: oklexsxh)0 9 x what is the phas6 8f69hm)qsj xq :r+l-l xkx c7evl0soe angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil andjb,2o+w,w p*/d s abhz 1.0-mF capacitor for a tozwjsb /p2o*+wbda,h, tal 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 100-W resz,y5yr)ys/jg dgyb/ 2 istor and 15-mH coil to get a total id/ 2rggyb,y y yz5/j)smpedance 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/az hyieph33 l- oeoq;, fd)d, in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000; ep/ dzq3dlya ,3hf-ieho,o) 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+ffa.gpu4;-wmr ;iky.0-MHz for a total 4a;yfwgfrmi.-p +k;u impedance 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 capacitor. Wu)tpb lv vf1h,l 59tx0hat is the impedance at 1)xfhv,tvb0 t p lu59l1000 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 sercyx-yg5 f0:dx r)i:r vies with a 10-mF capacitor at 1.0 kHz for a total im-vi:f)5ydx y:gr0cr xpedance 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 kHz for a phh+yltzg:gp 3k;ev t:9 ase a3t9+:gl zp ekyv: ;ghtngle 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 sv oa 3 * jp-6dbagfjobe271p8series with a 30-W resistor at 1.0 kHz for a total impedance86ap-od2gb3ae7 bjsv *f p1jo 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 capak3apl.phu1 o -* u bi)(nvg;gkcitor at 120 Hz. What is the phase ugilbh- (k u3gk1 *) p;v.napoangle?

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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 resiicz*lfk1 .dv i7jq 29rstor, 20-mH coil, and 1.0-mF capacitor vj 1fr9kcidl2.z7*q iare 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 consists of a 100-5(w;8oofqnlv u/y3o uW 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 iyon5 lu uwfoo8(vq ;3/n 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 30 W, and an inductor kynx nk2dfn+8e77cj -of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flon8e7cjkf7 -y +dxnkn 2ws 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 resistor, ac8bu4eob c(.c 10-mFcc.bu8c 4(obe capacitor, and a 0.45-H inductor, when 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 sk::z(t0pmcqib:o0sm eries with a 500-W resistor for a phase angle of s0mkt bzimp(:oc: :q 0$40^{\circ}$ 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-mHgj gdx1 )3bce7ht,/rdj2 +d+g3x yb kf, C = 10.0 mF. At what frequency should the cir c jbdxd7b+g/+1td rg2)y3kgh 3,xj efcuit 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 an ac series circuit with 12.0 W resistanceu0 ae6g3;uph a, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conu03;a6g eu hapnected 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 ACi k0jhd3k12 mq 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 ayp6 a1x:l mv6e9jq ql7 u*z)xjn impedance of 60 W and a resistance of 30 W. What is the power fa)mle x 1:xz6j vqj*l97y6qpuactor?

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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 tswo z)f k2:v:a series RLC circuit containing a 50-W resistor, a 10-mF capacitorvf2tk :osz:w), and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant99 jl cj65qi/sr0:tb ssw is*y frequency of a 1.0-mF capacitor and a 15-mH coil in series?sbi /l09jsqcj6 y9 ti ss:*rw5

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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 capacitor for a reson1/:4w (weje zdi/ ,tjsk0eo(fp2z wd vant frequefzwo, vje/2esw1ez0(jkt id:wd p4 /(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 series with a 3.7-mH inductor for a resonant freq1h0 l3dev6xn fuency of 0d 1hn63v exfl1000 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 inw qs yvjy9-/6t6z noj1 series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is v/w -1zo6 q6yyjnsj9tto be 1000 Hz?

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