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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ext wolp7zd; gdu+a995dcept

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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 inductionv5(wukj87zf(z y7h1q.v s jg gz2lb2/jgwa+ j states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chan mqrrxyeie3- (l; +l3uge on thmqeul; 3y 3xrle( r-i+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 through a loop of wire produces whae aq)*fepgnfgun7x ) 1+ 3:owit kind of change on the in13:w np+nig qae)fgxef)7 u*oduced $emf$, 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 the in3b7jdl*k9 d.2t lmpc) q/pnklduj/n*2d dmcl q 9k.kplpt)bl7 3ced $emf$, 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 fielf cj+i mm,f5r3d 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 af.-5kk. 3ppay59 kb gczf qpy;n induced current in a conductor will be that which tends to produce which of the followingf55f..y c-zq3kp p9p;yabk kg 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 horiza ilwhh h5 c )hs;22fd3nc7qgq7z :k4b. t*rqjontal table. A bar magnet is held above its center with its north pole pointing down. Th*k 7qi)lbt25c h4qqnh3cw f2.;sj7 rdag:zhhe stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar m44mb 1 .idesgdagnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces.ib 441gdsemd (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 magnetic field vecv6iw4x9y;7r- qzr bw dtor points straight up. The magnetic field vanishes suddenly. When viewed fro-i d x4w7 ;vwb9ryz6rqm 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 region wher.v lw(h tw0 -ph)gyerjq7k7hn zxs03.e the magnetic field vector points straight up. The magnetic k.w7 rpy0hq hxv3h). g7-s0w(nez ltjfield 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(c 6jdqn vsm3/6gj ,yx table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. c/6xmq(jygdjvn3 6 s, 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 horympgv)s k8(g7b+jcx 8 *a obn6izontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewm v*g)p 7c ax(k8njb8sy6g+o bed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north p(0 jm .*ibtqy 0z/m-bh: z8bnqgri2 kbole entering first. As the no*mri. 2 0b0h8 (/izqzmkqj-bb: gbyntrth pole enters 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 anz 8y 4ajo ,*cefm+pg9b axis whose direction can be varied. In a region wherefea*o ,gc9 y8+j mpbz4 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 wire is rotated at coe wj kb*b(rb-ug h;o*t 4u1jkx6pt*e -nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic j tuh *1eog* tkxu(k6bb;e*j-p-4rw b field points straight down, what must 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.h2/5ucd m7zx y
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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 ani,4xw9 gz26z7 uj7;ecw3 k2i x pwonlu $emf$ 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 p m/wzej*k x n,is aj- +1-fu*xdzb:qbl52ai 4a 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 dire3vff yrh8f *( (ggit6kction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rog6 t(v( i3 gfhfyfkr8*d.

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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 constanp+cu ytauu8:6 t 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 generatorip: -rghw 43kb transforms

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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 r 7+d cy4srm3brevolutions each second. The frequency of the 7ymrc4+d3s br $emf$ 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 used tciygr3i,qd p7bat; i v2jy. 5+w3wl3bo

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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 devicednu)ys7tf - (,5nsu0e0 fvxkij)q y s9 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 l,ah 78mpxm: dagazz +6oops than the primary coil then it x ap,a+d8m6a:hgzm z7 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 contain3gr: p,gi hj56bc s(kqs more loops than the secondary coib ,cph53g sgjq i:rk(6l then 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 powelf8mck- v dfo.6o 28yfr 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 resonal ljc ( b.*0 ufby+b-0k-thrmcnt 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 to an ideal hx6pkfuk 1u -0r0xj7zbattery of constant terminal voltage fj0zhk1u xrp70k-u6x. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in/..*9)bwu p lu uhqprg series to an ideal battery of constant terminal voltage. At the moment contact is made with the batte9bu purg ./qlp)h.u* wry, 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 rl y7;jh,lqpxl (p,:ybz- uwr-w5i+j with 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 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 if1,n1o:pedh rnductance 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 to a balue2s 1+ aqkv8ttery. The time constant for the circuit represents the time requireqau8k1l2s + ved 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 connected in series to a battery. The battllnj v -*-l n)eahzr*8ehl 32hery is suddenly removed from tha-n-lezv e*llnjh3 h*8 rl)h2 e circuit. The time constant 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 the same units except8zhs52n nuz+d;et,uc x nht3 03ncb5h:

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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 dshw) 5uaa 9e8supply. 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 c;zb y- om4w5xlonnected to an AC power supply. In this circuit, the current4bylo; zxmw5-

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc8y1vm ruyt) mzk3/lj rq0u 9;re in an ac circuit changes by what factor when the frequency is tripledujmlr ym tr;z /k9ur)v 8013qy?

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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 voltags/fx56;s42qaq zgbx678. wr masessx e across an inductor is doubled, the inductive reactance of that8sa;6mezs/ sxs xfaxgsq 42 w 567qb.r 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 pr0h*jf-t/ sytwja) ; approaches zero, the inductive reactance of thatyst * wp0ft-;ahjjr)/ 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 pow *cq, 6oh/1zn(blok vher supply. In this circuit, the currentkl/(o *, 6nzh cho1qvb

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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 aca c2yu85 1/d fr9mu a-tjzla+xb 9:kjy circuit changes by what factor when the frequency is tripleuul 1 5 9xj+ j8rbmtazy/y:af-k 92adcd?

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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 ca1z(pfz:q oo 5npacitor approaches zero, the capacitive reactance o fz5q z:1(npoof 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 voed,44 m g(+:y:pkfdt)dvgcw f ltages of the inductor and capacitor in a RLC seriy,m4dvf:d+)cek:4 d g fgt (wpes circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of jyn8: hsf7a6xan 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 circuit increases if R increa4c n:x6a+jqmj 9 yjcn,ses. When is this statement t q ny4,j6n+: 9cjmjaxcrue?

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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 ns 9ff0 a0 8e:to)uloscircuit 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 increases if fxrdhum:; 2 hg1/ub4/rk, uao$X_C$ 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 t5pe/9k vxa*yl7ng-0h bhfl 0/ 8w kgqbhe capacitance both double in an LRC series circuit, the resefwhaly h/pqbk0g9n8*b v/l5 k7- x0gonant 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 thatzhqkx9cg49okj xjf4:o 8e 0: :(irpgy is driven 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 ci o02y * reafee;,rs7y2j3hji4n7tfrvrcuit 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)v9e7mg0uvtb) n wx( t.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magxm(09g tb7 )etwu)vn vnetic 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 radiu ntmzhhk7pcn+.p)u 08 s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thr)7.numc8pk nh p+z0 htough 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 0.10 m is rotating in a uniform magnetz od)/r zoc/nzscn. m+q c37(vic 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 anmzzo.qccd/3 oz)+rc /v(snn 7gle 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 si gdp.h/2;gbxjl9 zzl5ngle 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 chg*)9gfeeu9 .9 bbq-4vyerv *ci ln m;sanges 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 frame with sisu6: y* er(bcs77ifk ddes 18 cm. A uniform magnetic field ickse rs767u:ydbi f (*s applied 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 ani dl.-: owfoi0d 7h7jjd an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area srl dnnx12;d( $0.20 \; m^{2}$ 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 rgs5/;m : ql le)iabb0 m0ya*blocation where the downward component of the Earth's magneticygr);lamm bq b*i:ae0/5l b0 s field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocj4.9eh )g.gbbv am0ul 46 onkqity of 2.0 rad/s about a vertical axis through one of its endgu6 jmv).4a 4bl qe k9.b0gnhos 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 area of1(/) 8kpurl2ti 2auogx1ub 6 ktwfi6 l $0.25 \; m^{2}$. 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 nv2:3*k4bbppllna z,ep a( c5a9 qz,n$0.090 \; m^{2}$ 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)vsf qo 8pu+)v on 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, which is perpendicular to the axis of rotation, what will be the maximum output vov+8fsp) ou q)vltage 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 consk 9edsi* m4c .nax)il3ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpe.y s4d8 f 8dzjn,si/put of 12 V maximum whdizsnj.s 4 88fpde, y/en rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gene9 stok 8a ( vxtr9r1-bqlgid0: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 operates o dpj ( n;e.(bxrz(8xpvri:* zkn $120 \; V$ 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 resistanpl jx 8lg: t116h4r2o hhampj3ce of 6.00 W. The motor operates on 120 V AC,plmhx1ja 3l6g8o 1r2tp h 4:jh and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a n2h:k5a du ynm9a*eemq ;e7i2 24-V power supply. The operating current is 1 e75m*emahaen;u2qdi: 9y2nk.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 rfftb nm+c;cr9 oa33c) esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac rcfo+mat3b;9 nf )c3ck $emf$ 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 x nh8 ) gy1m5dsn/na7k24-V power supply. The operating current is 1.0 A at full speed. gy1ds78nmna h)5knx/ 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 volk-a:bmyzmo) a16 kw:v tage 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 tran4kzi9to9o159lv7l :xk gpo gj sformer causes 14 A to flow in the secondary. How manoloo9 9gl :jg ti4zk15k9v7 xpy 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 ag.vtx u3ifwosuhga/ (:2us 577k* orin a 110-V primary if the 24-V secondary has as2 /og( ia :.sgxwu7*o h5v3kfutr 7u100 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 prima yd (-cqhrl z:;ajv4n 0t-p7zory coil and a 2000-turn secondary coil. If the current in the secondarz- r-nyojvz:qc d a0p74l ;ht(y 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 100% efficie bxk8 5wae1u:pncy, how manpkxe18ub5a:w y amps at 24 V 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 sign t;9kqyrn857gyjm* d*s7r7p r vh9.t 1fs euwa pransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 tjg;r *9 arvn1h u8y*mw.7 57p7py keds9rsfqV. 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 -l 2qseyi.o+ q5pybh/oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltageilp h+-qoqse 5./2y yb 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 prd2qw h,9 r5hxl5z hll6imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is azxr9whd,l56h 2l h5qlpplied 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 tur +utqsq )+e4shns and its secondary has 200 turns. If the input current at the primary is 1 h4 teqqssu++)00 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 se (ut1opt9k0k o8od brize:d/)condary has 200 turns. If the input voltage to the primary is 1:/k)iot8 zd1 9 ok(0po utedbr00 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 ha e)ot(nzn 55nr q3aa6hs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of tn)anr q a(5zeh5t63no he 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 v1aq6 ;f-g3q uq0uiovb oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the nuu1q063 iov;qgfbuaq - mber 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 60do ukfh*mu g 6h+a4(,y A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perhh k46df(uuo+*am yg, centage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped w.:b)uz udx ziz-i;0z up to 4500 V by a tr)uzd i zz:0ix ub;z-w.ansformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tot 2ke;b,mooog;6.os2 mtliuz7 al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatio;6 2eo. z,m7kool us;btimg2ng of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long ha;aw qy(bo6 +acs a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order toa 6;+aco(wq by 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-W line at 1000 :ckcr+s+1amjl ) .sg sV. How much less power would be lost if the power were traksljs).c++mg1a: rs cnsmitted 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 2sby0 0 be-lnqfjua-/ /0 A. It is to be transmitted on a line with resistance of en/0 f b0b lqay/-s-uj0.60 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 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 aas v)jtcobf-e r29 vcgk4-gt6 oz/6)o current of 5.0 A. How much energy is stored in the coil9ga 4 f/2ckvj 6b ooe)t)c-strzog-v6's magnetic 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*+3yxaq6sa gt -W resistor and an 18-H inductor. What is this circuit'x a3*aq+ygst 6s 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 where the rms volmulz+g+ )g;u)r;feovmg 8 lz(tage 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 iz :n;8;ufkhuyr h(5e AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What w25g 8qffts1bis the resistance of the lamp?ts gf5qbf1w2 8

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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 the peak curxf ry)vs5d8x;/ co:vkrent thr8 d: y)vx 5rsf/voxck;ough 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 supply. What gxi r8kyvvu sw4vy -vw625)7t is the power dissi w52v4)riv7vy8 tyux-sk6wvg pated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50nz9 mavqf9cljs *b-2 ywazw-(+1n; cw-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 resis4mm:+uzuzj kw,39 qs stor 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 qhk.wcjx. /;qa 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 ot,et;avit2 0k 6jy0gxegi( pbo.m)8.0-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 inductiv1mut a8,wz/ x(ck;qr c8y1cfpe reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive 35l;pkuq *tkvr9: gddreactance?

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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 react47 cp (ba7n5bne3 wyraewd i7;ance 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 v g1;k d5pqnrk5w,3xkdw65fx inductor when 120 V AC at a frequency of 20 kHz is applied p3kg515 vd xkk6w;,nfr wdq x5to 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 sourced4q b2mirco59o xpq28?

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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 reacjlf l iey,5+t ire8x:m8ruk-xt-q u(-tance 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 c;.ihs+rvoy1 k k56vd0 8s - ebrq9qkdtapacitive 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 capacitolznwg ,o*8vk qjldr-(:/b6xz r 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 capacitive reactance of a 0.010-mF cv 1mf7 bdmx+88opfp0v7 iu)waapacitor be 100 W+f8 0mp m1a)7wvd 8x7vipufob ?

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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 throug2kg26yfe / erfh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, w:uergel4r 1( 15.0 W inductive reactance, and 10.0 W cawgur41e(e : rlpacitive 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 a 100-W resistor, 20-mH coil, and 1.f9c8jco 3 ttr11v 1obc0-mF capacitor are connected incc1b j1fv9r 8 3tocot1 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,hw pnf h.;aruz(zk611s9 (dow and 1.0-mF capacitor are connected in ser a1(k f;6 dw(zuwhp9n1szh or.ies?

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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 seriem-9l kpt 0s3wss with a 20-mH inductor, what is the impedance at 1000 Hst kw30slmp-9z?

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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 ser5aql j8m:qmywa;h8lq;idr: 0ies with a 20-mH inductor, what is the phase angle at 100aa h; dmyrl:5jlq:88qw i;m0q0 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-*w, wbl6ak xzy5; r2wc +gsd3gmF capacitor for a totalz 6wb r,yawg ckl ;5d*xw32sg+ 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 resistk 8omb u-+xmjd (;f-qvor and 15-mH coil to get a totm-bujd+;v f(8 ok mqx-al impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series wi. i)hi; yu9hgem5(tdtth a 450-mH inductor at 5000 Hz for a total impe tmihh9i.d 5etu);(gydance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a ldkwns efn nm6vl;+za :0m1g h-e+x42total impedance ok-vd+: 6lwmnlzm axn+1f 20ne4e ;hsgf 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 connec5c0 t a282mryec8eucb-t enl6ted in series with a 20-mF capacitor. What is the impedance at 1et-65bc2 re l8n emy0c 8ta2uc000 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 1.0 k qzl:vkv 0:mvxt saw,gs4) 3vl5:tz0wHz for a total impedance of 45 W?l :4:, mqzvl 50zx)w:vtw0kt as3vgvs

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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(m:5 lzrwo:ygr+hxg jbnu- +6.0 kHz for a phase angle oby+ gwur5j6-:n rz+omhl gx( :f $40^{\circ}$?

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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 kH.ptrdv( xn1 cvfn 0.i0z for a total impedancex0(0. ni.c pvnvfd rt1 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 serie/sikc)9seor a g49 f fc:7et5ys with a 100-mF capacitor at 120 Hz. What is the phase angle)9 :fys7rkge5s 4f caci/9ote?

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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 w9z-r)vo.h6d t vrsf4 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected irvf)4-h9tr zd6so.v wn 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-W resistor, a 10.0-mF capacitor, and 4wh.x+ rsxcu(a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz4usx+xr wch .( 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 30 W,l 3 m*r+e8colbl:mg jt7f8ma: and an inductor of inductive reactance 30 W are connected in serie 8lej:3 + moc:8almgflbt7*m rs to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W ress9+ (ziuro2 tr7a ms30a:oct xistor, a 10-mF capacitor, and a 0.45-H inductuxroa7(t 9 coais0zs2m:rt3+or, 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 s9jchpxkbgp( tat: .( ,eries with a 500-W resistor for a phase angle oa,(b( gt .:xjptkp9hc f $40^{\circ}$ 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 g9;r cjj6z9l(2tdoh yW, L = 200-mH, C = 10.0 mF. At what frequency shouldd2(tjlc;h 69ogr9 jyz the circuit 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 ser-ddpz8rcg jlhlv;3 0j,-0m w el7uf h.ies circuit with 12.0 W resistance, 15.0 W inductive reactan. f8j-r30hguj ,vl;m7lz pldc-de0 hwce, 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 circuit is m:5lkye af*3w$63^{\circ}$. 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 a;i/gx p9i-u r s )(h;e* it4).pucvfw5 ortubzn impedance of 60 W and a resistance of 30 W. What is t*p -ih(9vgbie)ix4u ou;ctupzw/r5rft)s. ; he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a nab*6zd:(m dh series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to *d6md zbn(h:a a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-m faq4-z/difcqcvmn5 )1zp k 73H coil in series?q-q3n z5v fc4 /p1imd7fz)a kc

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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 resonant frequy,id ft0w n)3wency of 10 kHdif)n,3twyw0 z?

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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 freq jszr+l-- jc-yuency of 1000js-r-+-yljz c 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 m bn.trt5l8t t d38ifm7ust be placed in series with a 30-W resistor and a 40-mH coilr.8bl fit5nmdt8 tt37 if the resonant frequency of the circuit is to be 1000 Hz?

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