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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 unickc- 39bvo 1nj4)ot)y 6lwxo;ph; agpts of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction *0h8buc q8aplstates 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 c-u/ p7bq w4 ry;oceb5ooil produces what kind of change on the inducedoq4p5;e -/ bu7ywrboc $emf$, 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 t9 o c/ yyhtetpk0n9q;0he magnetic field through a loop of wire produces what 0nt p9y h9cyeqkot0 ;/kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ph6) dof/8ruh on the inducedf86 h/uh) dorp $emf$, 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 jt 7ut.z84bwfp)4j r za 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 cumm vo..fe k*(crrent in a conductor will be that which tends to produce which(v.om e .mfk*c 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 is hel992ul; r8xe.esaf aym d above its center with its north pole pointing down. The stationae9ml;fr8a us2.9ax eyry 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 magxwxx //:l (f26 fxhulrnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling2(rx6xfufl/h/ :xx w l 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 3;bh6fm lb o(xwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil alb;ox( f63 bmhs 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 where the magnetic fi0,h2u/+wtw v hr(lu iweld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the+whl(2u,t / 0rvwu ihw 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 apt8/qq e8rrj s1i2 lq8 region where the magnetic field points straight down. The magnetic field disappears sud 188q pqtjrisl8 q2re/denly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasinsg4n; 8stjjxkc.) ) e8h dg2svg current northwar2).gejsg) t k8 vdcnxs jh;84sd. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole e: h3lv0)h)utd;kh zf sv0 rh+dntering first. As the north pole euv3 trkh+dl hhhs)0dz:v;0f)nters 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 rotatebv+ m4.dn75 ct (n+zwlm9ybd vd at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poi+vnlbmdz ( m95d yc bv.wt+7n4nts 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 ,6rsia)jx p(x axis whose direction can be varied. In a region where a uniform magnetic field ()x 6pxr,jsaipoints 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.gdt lg-6bpb9r17(w z i
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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 0xiqf63;s ooytti0ocf;1p 1y an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetij3w+*w *y tcshe+o3orc 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 e2ujy (a)+ qh(gru/mpcast-west direction) is moved northward at constant velocity through a magnetic field that pointa+qcu()g/um pyj 2r(hs straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a ,w,e3th:qad 9 sl; dfwijz2j+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 generatoruqo7t lelywe /ta:/e83 -qpk2 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 r7-iez9ic ; gajevolutions each second. The frequency of the7e -iciajz9g ; $emf$ 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 usts zpvpaa):7v8p 9cxdtf* 6 4g+jrl: fed 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 devqrb jw14 b0riwi-few8 0+j6 vhice 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 c5p qmes3crtvnw :*r45 jp4y 2bontains more loops than the primary coil then it is*scv5b34 n rp4tj2 rqpyme5w: 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 mot7o 6;42f 0do16qzbe7ayry woe ovip,re loops than the secondary coil then it is a4t6adz ovypir ;eo6 7bye7oq0w 1,2f o

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th-fq+t )i+ fsj1syt khy9b5;bq e 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 circuitmrcz.4 io 2h t;w :wtfc;qt*9i,

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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 battery of kae a;v h0m:5jo7k4 s3o0c jrdconstant terminal voltage. At the k:osda3j;75kjh0 mv0o e4 racmoment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battgi c/liza,u 1.ery of constang,l /u1ci.a izt terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R e u vj9;.sjndvz .,h;uca d4l6is 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 ljjof-(vt6 s/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 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 - d (7d;gute*gwpzi8d/g+oz q to a battery. The time constant for the circuit represents the time required for the cu pdgg+u;etd -qdz*7w /z(8goirrent 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 ba9 6s9edf98jaz4tcx:l 8 5 ; wwlwttnzuttery. The battery is suddenly removed from the circuia88wj t6;s 9flt9 tuz l9zd:xwce45nwt. 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 excep6+gh zgx4hr v4t:

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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 supmjp;p rv k 1t3c+9n53qnmv; ydply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. 70vx9d4su a wsIn this circuit, the currens 7x40wdsvau9 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by whfjr+ak( m,i3b at factor when the frequency a b(3r +mj,fikis tripled?

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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 double dob):q6s k c)dj.pm6fwh.q)pd, the inductive reactance of that ip).dwqdfkob.:) pq mhc6j) s6nductor

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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 approachesw:akp: i vu9 tn rdr4/8i7fq+y zero, the inductive reactance of +ivyp/: rtku qi7rf 8dn4: 9wathat 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 nd;(kz h o8y/xt7ih k 1p-ao5mthis circuit, the currentmp /o1hziakdth x8-;(yk 57o n

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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 circuit changesgngmm* asi7d)2 wvk/: by what factor when the frequency is triplew/n :kaim7vg)2 dm sg*d?

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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 ;g s8eytzkp *7o ,u /1r7dkkk.jp9mue, the capacitive reactance of that capacito.z*9pjr ;md oyks 8et7 u7e1gp/kkuk ,r

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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;8j n+:cqenskw-a) p - lnds 9c(rybd+ the voltages of the inductor and capacitor in a RLC serc;salwkd9 :+je)+n8y sp- rnc( nb -qdies 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 an8 zqn)tj :qjn8 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 circuiv:daj(nfl.: z.r q9 ult. The impedance of the circuit increases if R increases. When is this statement t9 a rznl.v .l:dfju:(qrue?

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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 tnv6ak (hn-1 rfd2n , kmtvp-j1he 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 impb 6v)by)q-cv 9pswj7vedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both do . xingq*26nkiuble in an LRC series circuit, the resonant frequency of that circuit wgniqxnk.6*i 2ill

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circu :hy: gc2il8.rr;s:j qdj7pvv5 y-lqtit that 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 series1c bkp8he/dkrjo 3+ -x RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20.egnxyf ) 9mzg-qf-lyv:-)io T. Find the magnetic flux through the loop when xmqf e )lz v-). :f9gyy-gion-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 rotatinhb;. 2c31 p(y6ex vmrlnhwhx 6g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of xle(vy c;xr ph32b6.h6nwh 1m 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 m3 8mlt(dukfz: am xs7.; ol*d f9ea;wlagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t8*;. l7:l;kte9sz u3mdwdx(fol amf ahe 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 adjustable single loop is reduced frnt/ nyx kkdsb0- yb.(.om $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes z 96gmxm, ur(;dhor6kfrom $4.0 \times 10^{-5} \; Wb$ 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 sid6zimxhr: qej1gf)7f6l2 q+pqes 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to qzqe:6qfirhjxl +) 762mg pf10 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 mz(8k:9tkc 1-cjt yy)bqe (egarea 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 v co89hll0 0fnctjjs :o)-x+fand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wkm ,jau,b 4lc.here the downward c,m,.ajucl kb 4omponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular veldza-ty 4;w0rnh2/ b b9l5wd jmocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fieldldw;2a0hm/z bbd9ntj y- wr5 4 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 generatorerv vp ogur 5m7 n/g5et;.jw)0 has 50 loops 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 100zfi :ejb ipnw7,s :: jl1)yu(h turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cmk plpeub*9gs4s 7;o6 ufpiv5nds7m7, 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 se6ud*gip b9u;so p5k7v,7pfm4ns7l uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofqp-ky la4 82ba 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 wxxr/rw5+9 h*xpdf0l0wrg /zr ith an output of 12 V maximum when rotated at 60 Hz.d9rzpf0lhwxr5r/ /w+ gr x* x0 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 agqrm o*0ri . 5r5pf5kg 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 e/n8cg;g 0tx jof 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 have a re*c7ogmr uka 4dyfk7( 5sistance of 6.00 W. The motor operates on 120 ko7c5da*7r yufk m(4gV 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 resistance 6.0 W is con1x( 7oko)n+rin n3x aznected to a 24-V power supply. The operat+xxonk )n37o(a znri1ing current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W iss+z/9rgj:ruza (+ qd o connected to a 24-V power supply. The operating current is 1.0 A at full speed. What zosu:/+(+z9d rqja g ris the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suv2zdwvp0:nv .)e/fj npply. The operating current is 1.0 A at full speed. What ):f.ze2/vd p0 njv vnwis 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 transformerc0jhr-yjsfj *z;7l7b 6wpsuc9)j4 nd is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primi(k jl +b/(qb( nwcwh1ary of a transformer causes 14 A to flow in the secondk +i w(/hwbnc1j q(bl(ary. 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 the 29iqq4yn heu7sn7yb2dp,. w:tol0 2; y osm)b m4-V seco4;tiw9)0yds:q2yobhnys e mpum2ql ,7 o b.n7 ndary has 100 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 500-46b d* tygac2) /myqfxturn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 4y*yb2f6 qgtadc )x/m 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% efficiencyo0xqwtn *+xc *)a*prvi)ld 1c, how many amps atw*n* 1o* xq rt)valdc)px+ic 0 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 transformer provides 7500 V at 10.0 n ldc- p1e/ig:mA. The primary coil operates on 120 V. What doe1:dlein pc/-g s 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 coil and 300 turns on m8: tw b:: va(cpw*masits secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in(vp cmb a :a8*wmwt:s: 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 turn;1me5 (aglnp fs on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied pl;f(m e1 ang5to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn15i,acl ku/.gnovk j e6:b0g ys. If the input current at the primary is 100 A, we can expect the output current at the secondar/5ve:nkko0g l,yab6 i j1 gcu.y 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 transformer0e,ybdq6nzk:7m 8,ren 8ns fl has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondarykmn7ns8,yed e 0: ql bfz8,nr6 to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu q )uj)3nw pxh2-yw/,g( ,juc9lysnnt rns. If the power input to the primary is 100 W, we can expect the power output of qnpw /j3)y-g, yu cwlh2jn9nus t),(xthe 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 produces8q3ksev;s6wgu, 9m yv 60 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.9 6eyvgmswu;q v,8k3s Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60;m*qf i. 9-(vqp5ienbs rs (rj 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 percentage pobf (9m*eqin5vp-.qrir ss;j (wer 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 uu2ewusga;g8u-yrkd)p8 u :u)sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0g;:88uuu uau2d)wreg-yk)p s 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 li g32lq5q5hwe hne 50 km 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 perc5ghq3he 52qlwentage 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 has a total resistance of 0.60 W. (w0hqx6 jslg 1 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 sqhjw g1 l(06xlost 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 down4 y.*7ri 2n3 kjtco1 dvw.svmg a 6-W line at 1000 V. How much less power would be lost if the power were transg1.*rd 3ik2stnm v w yvj47co.mitted 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 gene-3*ccktpfn 1wk q.b2s rator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To whats*nc1- fpwk 2tbk.qc 3 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 a currentmziy+d+ v7j0sd9e vn; of 5.0 A. How much energy is stored in the coil's7 y nd;mv +ed0jis9+vz 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-W resistor and an 18-H inductor. Whatl,8ae v4eztf-d0ue x ) is this circuit's time constant?eve4tfau,0ze )-8 ldx

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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 voltage is 5 qb2sick8 ph-sg:5av sb t-m9120 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 outd9m2jv b;:cob let. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance oa*n09ta8 pdwbta j(-rtr *2iff the lamp? tn rw-f08t a(b9ad*r*2aptij

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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 cur. t7qs0b-z wfykk+ m/tr .yi7wrent through the res/-r7z.7+y0kqw m.siytf btwkistor?

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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. Wk3f mj o, u5 0zpvjtwb+j/v8/ehat is the power dissipateu 0ej5vb j/t+w8/ fj3 ,kovpmzd 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 50-W re st,cgr7yq.wl ,: jmb/sistor 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 resisth;a5k *9cwn/u 5q owwmor 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 50gmn(-k0vttm d+8 id/w-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 o :;grpzk+q 9vhf a 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-mH coil at 1000 3,+,gjx-mhormae sbl tt 1y92j o8wa-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.(93kvs/yjoanq6qnng 5s9,7 q a*f kpb0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 15ear jzh28 lh 5 j4*t3wu(7xvo5soo-lb7 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-mtyeihv w+c(z 7j.m-4b H inductor when 120 V AC at a frequency of 20 kHz is appliive7.z 4+y m hbw(jc-ted 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 bb08 (os/x8*r n xcmfpe8(aywdue to a 110-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 capacitive8if:7m xe he1s 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 hak,j88gc b1h* f3bojrz ve 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capac+(diic 1zsv)citor 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 capacitor bevz9c c3emcc0 t 4yo13m 100 Wcct9y1cc m34o3vm0ez?

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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 cag) l(yw n(bwz /yzc(o9pacitor 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 sey,owcc,i60 3h q6vu grries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac rv6w,3ciy,h ou0gq6citive 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 cozaom aqq (hvf+emrv g:+(n(4)il, and 1.0-mF capacitor a:f((r na aevh z)(o4m+qmq+gvre 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 1ah 9xi1 8xft.l500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se8tlh xxi19 .afries?

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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 connect9p02kmbg uv 9b,q w4baed in series with a 20-mH inductor, what is the imwgbvu4,k2 b 0bp 9qa9mpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is c;6e(jjyxt w+a onnected in series with a 20-mH inductor, what is the phase angle at 100ayex+ t 6;(wjj0 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 circuitq/pz72bu grj)n6b x.ic5nby3s +(sl s with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 /2z brb(bsqp5ci+g)nl u.ysxj67n3sHz?

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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 capb e v(gj hb* :ic:r4fmz)f*y)2hbc 7vc7nlq)i acitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 11l)n(ri2*f jvieb)7 4bqz) vb*cfgc 7h::chym0 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 c(7d2u3e : i jchvkfa8put in series with a 450-mH inductor at 5000 Hz for a total impejh7d (3af8u c: ki2vecdance 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+jcpx m7 -mt4w 100-kW resistor at 1.0-MHz for a total impedance - 7mmj+c4ptxwof 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 (fq p)/xlgmm9ppvm*a6c)g6q a 20-mF capacitor. What is the impedancep *)acmq q pgfl p9m6)v/g(6mx at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.00y dgpmkl71l + kHz for a total imp1+plm d 0g7klyedance 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 cadyu 8ae: zgz3+67fn5rtyp* lcpacitor at 1.0 kHz for a phase ang3 *6:5p 8zr+ znuaey lyg7fdtcle 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 need,u /r1 k/thvpct kj rf6zt(:4bed in series with a 30-W resistor at 1.0 kHz for a total impedan6(k hj tzrb4frvt1tcpu ,k: //ce 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 capacitor at 120 Hz. What is th 2og a- p2t6qzrth9je; vs*8ukv(jn,he phase angle?2v, t*su 6-qt;2 ozrph gehjj 8v(akn9

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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 100xdca:st1qf2) j c o7yska5/2t-W resistor, 20-mH coil, and 1.0-mF ca27skt at)2f yq5cd cxoa:j1s/pacitor 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 of a 100-W resisto ad 02lxg;sn4le d(a9pr, a 10.0-mF capacitor, and a 0.350-H inductor. The c4 0 9gldapn2a;(l sdexircuit 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 of capacitive reactance 30 W, and an indu08i )e-x(xc/nl a rb9xyff t-gctor of inductive reactance 30 W arti-b gxnal/ yf xxc rf0()-89ee connected in series 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 r6dq+ hse((zs;b am-meesistor, a 10-mF capacitor, and a 0.45-H inductor, when conneb-mme ds( +h6(;eqazscted to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resisq.nccbxqyq9 p6 z.3zu j0(7va tor for a phase angle of .yqjc6vzn 7 .(pbx0z3q9uac q$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. A col*;cku+r houw/s32 t what frequency su *;lcsu23ch/ o+workhould 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 series circuit with 12.0 k+s y8gx+k gjb k-a.e2W resistance, 15.0 W inductive reactance, andg .k-x+ gysjak28b+ek 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 Apunbd24 /+ jueC 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 andot,ih1 gnfle9o8x1 *g a resistance of 30 W. What is the power fa*x1,1lg9 h o tfnigeo8ctor?

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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 serie6, a.trr3up d4zppd6e s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl,.apdrz4 edupr66p 3ty?

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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 freknvs g6c; kgij q+0xz19t*yu + zdtk .qa0f/q1quency of a 1.0-mF capacitor and a 15-mH coil in series?u1k9x6 . q /ydfkcqqigaktt*z+;g1n0+z vs 0j

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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 capaf/r.*mxp qzacy/hc;+citor for a resonant frequency ofc c/zpx ;y/*rm aqh.+f 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 freq vk)r-1qu lg3b tncj;9uency of 10urbqj 9 n -vtgl13);ck00 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 qf-5mu 8/0myghs(pcu zob;h/w4:fhemust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the ciygu48-b(mshpfo/:5/h;f cqehuw z m 0 rcuit is to be 1000 Hz?

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