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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic o+0ilcga)mcm fsq 8 delh +c/ 7)d64oiflux 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 states t:g9ag(,c-lm/a vlbs3g tj8wwhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changg o3ggv1+d(vye on the+y vdv ggg1(3o 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 thrq3+x tg ,qrqjj5i6r1jk2+-n mgf ge5bough a loop of wire produces what kind of change on the xj,-gj31qq t b6mj25gr+qik+e f5n rginduced $emf$, 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 kirhv.uc ovdt4m i 8dq tragw(8;-)/9qd nd of change on the inducecm9ud 84qa.th)qrgdr/-v8vdi( o tw;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 fiel (3(sz+ktydc;f hjc0 ag u4xo6b4jt0c-ld7 ood an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor lhkma09 6xo ej )o7jc0will be that which tends to pjox o0l ekh)jc6a0m79roduce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet: l5 s5q2r +on xv/whnud6b,pp is held above its center with its north pole pointing down. The stati2n5rqsuo ,xh5pbnd p/wl v+: 6onary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hor)q93v vwqx6up6hnq u 0izontal table. A bar magnet is held above its center with its north pole pointing3hv0wpxu669n u qqqv ) down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in h a:,jv.4r*+r xx88oitozi(fj 4touaa region where the magnetic field vector points straight up. The magnetic field vanishes suddenly.af* hxotjo+88rj uv4 :t(,4ii.ar ozx 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 region7wcuqrfgv y+ )x(p7(v where the magnetic field vector points straight up. The magnetic field suddenly grows ufwyv)c gq7vpr(x (+7stronger. 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 region where the magnetic fim h;jg ,(a*dm k:gtl,9wyp+zp4x/ hoqeld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappel hh+ k;pa9ogqz m/(:x dy*,pmw 4j,tgars?

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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 ag6jyg-gjdu cv 5,7a-bjt gk *(nd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the ibjg5cjg(7uyg- 6d-, gvj*ta knduced 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 ente9c x )ew1,d 4mom6pgkn hz;mt*ring first. As the north pole enters the wire, the induced current will be (as viewed from abm1 4gk)n, womd;pmcex9h6 t*zove)

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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 7w*;dtszq )2sqa:v n iat constant angular speed about an axis whose direction can be varied. In a region where a qsiw 7zvsq * :)tand2;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 wire is rotated at constant angular speed about an axis w,bz+r-m lb2w: ywv,qdhose direction can be varied. In a region where a uniform magnetic field points straight down, what must w2q dby+ z,:v rbml,w-be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.hohq9wkqu.nx+kp(y xa2*7 t6
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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 o4k+f)k4y:a brxqic*$emf$ 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 baqtcyf9 ,i9b a4e f0 xt6wv+0a magnetic 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 (oriented in the east-west direction) is moved norssb g(nbsj52 8thward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acbbgss(j 52 8snross 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 084yez9* ojxxqu l8 yx.e 6jbbsor(/cangular 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 transforms igelc 3xumv4)x2+41ue jxxba ocu/+,

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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 secoelbkh 1ei/irs:f tfm *kq)6+4nd. The frequency of thr lbmk)t1/+k efsii * hf4:eq6e $emf$ 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 u)45u sdyln9g3sv/lnvsed 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 d xdbo0 4jj,+xwt3s87x*uo+t+m sljw levice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loj ;uz1i 0*nucfy9vm h8ops than the primary coil then i 1h;8muz9*ncyi jfv 0ut 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 contg;skb:nj nz,y;(e )92g/mjj +j zzxl iains more loops than the secondary coil then (n:lkjx/m;bij ) esgj ,j9z2zgy+ n;z 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, thez4i;w8t:+2dm4y2zwgoenzdr 8v +z kn 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 resonant c on wd2/n e83v, fk3h,3vpyywzircuit,

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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 ind7(6ak f* qj1nhn6rxupuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ar f7xp 6uah(njk6q n*1cross 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 coy7(ge 4 lrv2d7cix2*l in.v pynnected in series to an ideal battery of constant terminal voltage. At the moment contl7dv r(iy*.lipgc 2y 7 4nx2evact 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 inductawtzf6kn0yd0 s (e 7;i2c08ne c s;ivoonce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance9xm( qf4b l,h 4kjr(hg 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 induc v(vz 3 cat7n 0efma*in;t-i7 wlal;k7tor are connected in series to a battery. The time constant for the circuit represents the time requiriwcn77z-tai(;tevlmaa 730l*; nfkv ed for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cog -7 q6z9wlo)nm +acwyk qpe7+nnected in series to a battery. The battery is suddenly removed from the circuit. The time const k q76 any czw7lwgomp++e-9q)ant 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 following have thv+wcizhi-2 9se same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supplvpoce snz88jg 9ok bgpl66),z 7dc98oy. 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- n-;e,n4+oqrhjzz ph power supply. In this circuit, the current-j4e+hrz;hn,q- on zp

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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 csvvaesj58 2m /hanges by what factor when the frequency is tvv aj/sme8s5 2ripled?

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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 vo5c g5l+mrbgfd5m t21 ht;+yi rltage across an inductor is doubled, the inductive reactance of that 55m fydtrmlrh ++;gt b1g c52iinductor

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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 ind3r0/9 6m gywbe rkry*v23zykvuctor approaches zero, the inductive reactancery6 v0kry/wzkvm yr*g 3b92e3 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 cir- sui,u/gwm x:cuit, the currentxg w/u,s- umi:

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac c.ev 8(s4kzdx*ugnqte:y s.:b ircuit changes by what factor when the frequency is xvedbe:s ku :y.t4.zngq8 ( *stripled?

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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 vvhpg.d4 k ghi 73n6 eiyz,r;;aoltage across a capacitor approaches zero, the capacitive reactance oznerigd 4hkv; g p 3,7h6;.yaif 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 volta ofxbxvd0 pmhe ,7-h--ges of the inductor and capacitor in a RLC series cx0v-m-xeo7,hp b -fh dircuit?

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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 a gv(vo;2/tb tjn 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 impedance of the circ,hi-cn i0 -flzuit increases if R increases. When is this statementh,-nzii-cl 0f 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 iylqjxif78y8;w lq7t/mpedance of the 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 impedance of the circuit 5m.knp(d;p 0o l0dbn uincreases 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 capacitanbg /kk 6;zsu u-glyf,/ )6wntvce both double in an LRC series circuit, the resonant frequency of t b-,t)gvlgk/fku6sn6/ w zu y;hat 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 Azmwfn -o c 8d(s7.8m+a8 u-fi/wygumsC 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 occurs pz(r) d+b*gf a 6ja-rpwhen

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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 oo7k,bd*54: caoc lpbmxork(uhq8 l2q89 e v,tf 0.20 T. Find the :p k5dbqrc2bqm, 9uleo8xh87 co,tol(vk*4amagnetic 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 field of 0.24te /+k h0r+yx bf9,nues pqk90 T. Find the magnetic flux through the loop when the plane of the loop and the matuqk9pfb sex+hy/ r,e k9 +40ngnetic 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 rotath aoo/hz.s o467 5v)a:rig2epa ;umxwing 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 atv7io5xsa.pa/4h w rzo :m;au)ghe2 o6 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 singl2r4ksw(re5ln y yly-c7p u7c1e 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 chazk a /oykcx uo*i*w5y2+c9p9 rnges 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 fran l 24 h.l;cz /xjsmvpgwn-f5)me with sides 18 cm. A uniform magnetic field is applied perpendicular to the n)ljs4mg v2w p5/zn-l; . xfhcplane 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 a :e ai51e nbcm qd57n-y1vxx7lrea 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 an 16.*gng / 4srje -igp.tpaeqb2wifj,d 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 horizontalld 4xwu76kz.fky at a location where the downward component of the Earth's magnetikx76d4w.fkz u c 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 loncc3dz /f7jec4g rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through oned 4ecc73z/cfj 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 loops and a cross-sectional ar/m9*o*rjpsz iea 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 turn:)y mgskag 4lyqchf2d3 yp3) ,s 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 7 k4acl r+g-yzf7ufr-its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, whichu-k-7 r 4+af yrl7gzfc is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tpbm .j461zy9/ kolmgwurns 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 sirg(4xd r pr utlib:6;aaal/o +i.d( 3qmple AC generator with an output of 12 V maximum when rotated ataldi ;ra:3 u xari rpolt6(d. b+4(gq/ 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 generator with a may +fiap,f 3 m+dcu2dz5ximum $emf$ 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 syi3e f.m,0,9+ sbagnwkx2 wl a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor q8ms1 b *zl218ijz4 nxu ,hwdxhave a resistance of 6.00 W. The motor operates on 120 Vhij4uq8 mbx2w z,s8z dlnx*11 AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista6 2dhn:;g p+sm 2jra6qq.dawl nce 6.0 W is connected to a 24-V power supply. The operating currman: .hsawjpqg6 +;r d6qld2 2ent 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 av0ppj6 -(v dyhe xhx6h2z :-vis connected to a 24-V power supply. The operating current is 1.0 A at full speed. What isp v(vh6ax6j zx- hv:y20eh-pd 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 res0i b;xbibny7es .*-lcistance 6.0 W is connected to a 24-V power supply. The operating current i;7.xib-y0 ibl scn be*s 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary 6z/9 gmisox -:gd da7xvoltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 p:sa 5v* w2ysoA to flow in the secondary.po: ya2s5vw*s How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if 0 evxn e2:gs--oxnt7l9cgrw -the 24-V secondary has 17xwscrn 0eg2- n-vtgxo l:e9- 00 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 coil and a 2000-turn secome cd)9+ +ghjondary coil. ++hc)m9e odjgIf the current 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 100c k;5hyj*s(zabi z- hk+zr57 b% efficiency, how many amps at 24 V-z hsji kz* ;5rbka7zb+(y 5hc can flow 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 sig g ynod- -pqqsk) ztzg4a0141tn transformer provides 7500 V at 10.0 mA. The pri)gndqpz- k-4qg 01 4t1syztoamary coil operates 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 has 60 turns on its primary c zqz6* ).pkrb)qcn4ws1obk 6soil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prim.qcnq6prs ow*4kb1)6z)s z kbary, 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 secoxhp/ 2-k2vsuu ndary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thpu2k hsv/-2uxe 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 ).bjf yv);ar inv; l8eturns and its secondary has 200 turns. If the inpi)b8a.f) nely vv;; rjut current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hjf k zj8a4tzacys:05,as 200 turns. If the input voltage to the primary is 100 V, we canc5:a 08 zzts4ja,kyj f 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 turnpyf0 x3, b aer7r3sf;us and its secondary has 200 turns. If the power input to the primarpf xu,fab3 3 e;rs70ryy 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 usvg1s memv*s ::ually 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 secondary if the primary has *mvm: esv1: gs200 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 ats,)vf*z9is . kjzzte, 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in thk9 ,vfzj)ie*t ,szzs. e transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step7s0la ba qzyr*q+l 4nh6ea9 3mped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percl4zaqamq*yb 7ena0r96hs+ 3l entage 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 lonku1q4at * 0qhze l .x:h+(hnxkg 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 would be lost if thq.1 axnkeuq+l(k:h * xh40zhte 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 kmi:evv .xp7c6q 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 original energy is lost when the tr:xp6ec v .iqv7ansformer 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 10ab/;abc0e 2cx h()trw,si 6bna k/b,s00 V. How much less power would be lost if the power were traa(/xisc) artkw, enc0 bb; 6bsa2,b/hnsmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lin6 x.ev vwa;8z3c so;mje 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 ev8ve6a;.mc;3z xj so wxceed 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 cu3*38m df gbwcy hp+sz6rrent of 5.0 A. How much energy is stored in the coil's magnetic fi cd368wfgy+*m sphb3 zeld?

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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 6zh: v+ju1oeu+ (vy/u dn k:rd:2zv+ ig.0-W resistor and an 18-H inductor. What is this circuit's time conzu (uyi+z:rgvk uh2+dnvveo+j/1d : : stant?

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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 rms2y28afg8r udz.iz ; nb voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curren6m)fiz7jb1;fut dkpt q)jk w4b1mp:- n/9kgi t?

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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 placedd7 0 fkmgck9+ufdcce) 1nil*8trqo 6j(j w0)x into a 120-V AC outlet. What is the resistance of the laftkcj 8 ()1q)ng6u m0okfc0x 9j*lrei c w7+ddmp?

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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 supplq0 j4 y:0yge2l)4b0 eeuoyr3nvx3 kvc4c5mldy. What is the peak currecqveg yd4mko:043 eb rul5xyjlcy 4)e3020 vnnt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power sj35lvkr (r.vboig;2 8v ep z0gupply. What is the power dissipated in the resistor283l v j gpk5ivovrb;e.z 0gr(?

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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 55x(*+;6ti bxduj4 dw(x trkn1sta;y; nuici9 0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W d.yb uuf- w(n r,y pa5vdly6)3resistor 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 afg h-m0o89g5 fcdthr* 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.rlc.5 *rau3sgyw:sknkj1m0cg0 al8 1+ qq2 fg0-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-mH coil at k( msv,8cf+l c1000 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 rex1 v27p)o,m lyouw6b kactance?

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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 read+ vvwe;fx. o98o*ed0yx qt4i ctance 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 whe;do y+l6ug:ox4g; p//25uhindzl thtn 120 V AC at a frequency of 20 kHz is hgdtg :; o56z lp4/xh i+uy2;luno/dtapplied 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 meps(lt)k+,g ia)(d hHz 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 capacitiv4peqs3fq ocp ;qw 6-e,e reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive re;qac p g.qq(vci8+kkau,, h(v actance 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 rea*:u 6m/ qh.akg80 y5qhvmh+dclw ht0uctance 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 capacitive reactance of a1 ,.+qwk1z(npqg s0xlus 5/3 yzxamo i 0.010-mF capacitor be 100 W?qn( z01i.,g5+x1/zpm3qksysu o lw xa

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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 5.0vq5 gt(ihl6,pli 9 l7e 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 seri8f.bk/6zzjem,lkrp +f.( t*+0amndlh g4 czdes circuit with 12.0 W resistance, 15.0 W induct*mz + p(/,8faznbkf 4jeh6g.z. mc d+ltdrl0kive 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 at 1500 Hz if an 2v;x zw amxlil:ns7:tks21; 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co:7sa; llx: zsvtkmn;2x2 iw n1nnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF iuo 85txm jy59c wi4f2capacitor a mci8owji5u f4t5x2y9 re 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 sy1mz .rh sah(/hmz, 3a 20-mH inductor, what is the impedance hzm/ ,h(mrs3a .yhsz1at 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;6c 9ygcp.p ,rwgrp2g6dwtml h . 1/ym is connected in series with a 20-mH inductor, what is the phase angle at 1rm p.1 hlgtgdpy cp.cmgww ;r9/66,2y000 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 1.0-mttdt0qb 0 /bpy-dp4 k0F capacitor for a p0p40q tt/- dyd t0kbbtotal 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 seriz3f3zh9w n3 ukes with a 100-W resistor and 15-mH coil to get a total3wkuh3z nzf93 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 seri8r sxlyvm 9o18ab +x5ees with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?8xb lay5s9+vo18rxem

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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 witqa x0me 5t, qnog4ch6(h a 100-kW resistor at 1.0-MHz for a total impedhgn0q4 tac,xo5 6m( qeance 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- s2knd k76c5lomF capacitor. What is the impedance atl6kd 27n5cko s 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 a 10-mF capacitor at 1.fad)o bld*4*yyia)0va b9da10 kHz for a total impedancea4 0f)dlv *y bai d9a*ado1)by 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 fq/ipe,lwk 8(u8npvjbpml 8xwk/o7pu p)5*/ zor a phas/kw5p n mp pxk/bzev7wqpo, )88*pui j8(u/lle angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W res.kiprsv2*nant t h/d )d8s10 bkp7kn 4istor at 1.0 kHz for a totalks41.0 sn/d7 v p2*rtkhnb)tdip8n ka impedance 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 withl.ro-ee/i i :sa6uq s1+vyf8b a 100-mF capacitor at 120 Hz. What is the phase ang :8o. / rylevi6ai+qsf1 b-eusle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows aof16 k d9gyjap:84(gc,wuu oat 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacia968oaojdp uf:cy4 ,kg (wu1 gtor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists ofkii arqu q6-7ycl(:70eifr-g a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H indlyi-6(-u ca7gi: ef7rqi qrk0 uctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor o :apym. an25kof capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currenyp. na2ako:m 5t 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 ysr19,-pb fp*d) tlzp3g v/fz50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecv-d3 9rp1fpp z*tby/g)f, z lsted 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 necessar9me(ymc 6*l7j +xqpday in series with a 500-W resistor for a phase angle oey7 c9j6 *m(dlxapm+qf $40^{\circ}$ 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 =zh obu06 r+wy; 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be drivzr oy+ b0wuh6;en 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 cidah rcx z e7)wap;5bi- rq-wni* uk-+4rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con 5zr7aeiid+ u w-)nabw*ck 4xq-r ;hp-nected 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 A0kl (n/ us ldr4va;4gio5*cggC 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 W and a resistance of 3p,,ewrnb di9( k3x5el0 W. What is the power factor,i9e kb,w(l3 e p5xdnr?

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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 se1p v/x7uequ9xo+c oq 2 oj,b1dries RLC circuit containing a 50-W resistor, a 10-mF capacitor, ano1+ 7pe9 c q2u/1o,xj dqbvxoud a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF5rv 6,lbyqy xm 1 c,ee4w9qoi1 capacitor and a 15-mH coil in series? vb,i 1ecxq qe16l95owmr ,4yy

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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 uza 0q3xae: :tcapacitor for a resonant frequency of 10 kHz?et:aq x a3z:u0

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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 inducpgv -h ;mb4ra0cw6fs1tor for a resonant frequ-s64rvpa gbcf0 h ;mw1ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40,t r)/dygt:m2 uubpnj zsg1 ))-mH coil if the resonant frequency of the cirg) rut1u/mybzn jtd)s2 )p ,:gcuit is to be 1000 Hz?

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