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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 magnetf/4lx10vz- cqb9pvl/si9a xcic 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 induql6;qj ) spjog6vujyy. ;3nszh4 n25 , rbwoh/ction 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 produ9sf)dlvg ; 4 2 sy,:ljk)nfhvaces what kind of change on the indufkj )vfs: ;alvly2h9d,g4n )sced $emf$, 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 uj8 l1/,oh(z0 5vkja fbbx(dp wire produces what kind of chapjob kajlv0( u/8 z1d ,(5bfxhnge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the induu(iz 0gl+5q /dk7avyq c/q ikvd l(yqza70u+ 5ged $emf$, 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 fr gjcpzl00jem95qxg7xt 6t..mgk s 06 zom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducedx;autn7ua1)g daj r .* current in a conductor will be that which tends to produce which of the following effects? x7dja1a;a rn*)ut.u g

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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 held above itih8:3o grknq+a3l p wkd 8xvrps-w,8:3c rzt(s center with its north pole pointing down. The st w:gs( d3h,8lra-rx8q +v3w:8tc o i kpnr3kzpationary 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 tabyu5q i 69bo pf(d6lra9le. A bar magnet is held above its center with its north pole pointing down, and released. As it approache yr 69pq56d oubl9fia(s the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fiyj*1 /79b/lefi anhf meld vector points straight up. Thelh anfbm7iy9* /fe/1 j magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnet:k/fo9s1 bttx ic field vector points straight up. The magnetic field suddenly grows stronger. When viewt1:xf9s bo/kt ed 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 fiel9 tjgd 6vlp111.upcl 2(vxaecd points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direc1tl. v9e21 p 1gapvd6lc(cjxution 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( vo3 3 x3lez2wrgss+z a horizontal 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 viewed from ag xv3sosl+3wz(2r ez3bove, 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 wi; q/o+j myx, *orvr64zfh*prith the north pole entering first. As the northz;y,*xr rorj q* fomph/i+4v6 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 abouhlnx(fg2 u8apf79f7 v1vid*u t an axis whose direction can be varied. In a regionuuh7a f1*7vxv(8dnpf 29lgfi where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotateur n0:e(huex kh1ud(1d at constant angular speed about an axis whose direction can be varied. In ee1: nh1d( uuxh0k(ru a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.pll-31l mz4c m
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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 tmzezn mw .tu+/,kn:ht0h- kl3hat 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 j, fz 6rg()nisa 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-westp:+a :j :qrz.ors9y bb direction) is moved northward at constant velocity through a magne:p. orq:rb+:ay9 bjsztic field that points 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 constant angular veloeusox(3+m8 -msky:o y city $\omega$ 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 trant o 8nqbn h*f2lm8lrxuk.,1a8sforms

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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 e2n lt) x9l adz8p r((b,)zqrteach second. The frequency of txnrrq(2zt9 eldla8 , ))tbp( zhe $emf$ 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 kw4yto4pt;c su)x b q:6*o/r mro4.as used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tvo2te8mq0* nr hat

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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 loops than the primap5 dt/i3w. bamry coil then it is5tw3ma bi .pd/ 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 cmml id5q-ppo 9+ 4jr8koil contains more loops than the secondary coil then i m4ki9dop- 5mrpl8+qjt is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power ind vvupxu - 3m2c94b6pnput

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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 circuit09bkp +h spw6v1ok(c t,

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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 inductk) wqfl ,gjn54or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage l5fn4jw, )kgqacross 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 serlqks) x pi2n 2h2;tfi6.7fcj zies to an ideal battery of constant terminal voltage. At the f qi; 2.2t6ns pfl)hzjc2xk7i moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conngnvp:oy5zw k+av e-+7 ected 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 inductance L and resistankl3bt+oknn 4s2*.7euxd qp2 nce 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)llq5r6sowc , a battery. The time constant for the circuitcl )5qw6los,r represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inz,ofee .n0v3hductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents th3fen.v o, z0ehe 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 thqmaa y m2i)v 35 k*fwzfmeo (,g*+1ylne 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 3:2oosr) rlic an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, th)b oura+a8 b4te curren) t b4b8o+raaut

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the 51)i6 zzyk6v chgz5ph frequenc v5ygc5ip1z h66kz z)hy is 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 6kv8p ky5- qhyvoltage across an inductor is doubled, the inductive reactance of v8h kkp6-5yyq that 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 b) 8st*go3s6bu,a vfrvoltage across an inductor approaches zero, the inductive reacta ost*vs gbra3)fu6b8,nce 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 sspaa1h s3( bv rnx3i1o-qrx. -upply. In this circuit, the current -1x(.hxiv-3aosnqb sra3 p1r

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i/ 3el gzjsu (q3qox.9vuxlf0 q 9rl5t-n an ac circuit changes by what factor when the frequency is tripu39 r 9u5f0j.qlqz -vg /oqxe (lxtls3led?

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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 tzuq:wu0g16 paqdyy 4v;ft , w*6cbe2a capacitor approaches zero, the capacitive reactance of that capacitow,0u yty*qfbewp v6;u4 tzd61q 2ca: gr

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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 betw qfho2 58e9p0)hght kbeen the voltages of the inductor and capacitor in a RLC serieshbhe)9g5h o8 0kfptq2 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 an RLC circuit is defined an,rl 93wkgi3ihd:17m slai2g s $\cos M = R/Z$, 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 circuitlb+ v wh0v1x wqzjl;y-fo8,+s. The impedance of the circuit increases if R increases. When i0z1y j, owv-xv lf w+;lbqsh8+s this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the ciu 9hwa5rw +pmr1:b-p ai4/p zarcuit 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 ia l;u1 ane8a0te,pg ,tr e2nn6f $X_C$ 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 ther9 3ju0pma3oy capacitance both double in an LRC series circuit, the resonant frequency of that c9 yaup3r 3jom0ircuit 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 i0p /nr/0uq6t y z;;vkx7emb xax21sehs 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 circuit occurs w,cto2y s2wt7oyr ;,iu hen

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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 q2w- t51pnjv4t)vp sv in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop anw 1)5v j4ppntvsqt-v2d 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 rot: m+* *2e2lzglrega cpating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m zr+eagmpc2g*e ll2:*agnetic 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 magneticrlh88u9 mmn sokxx7 sc,0dp9, field of 0.20 T. Find the magnetic flux through the loop0d8 mcp8m799sn,lo,s ruhx x k when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reducw6sav q2x2q3w ed from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from-8h;t3p/o8u 2p lnm1h leisum $4.0 \times 10^{-5} \; Wb$ 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 tu 5tzrpun +xxaa-c +i.78n/guxrns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T 8ncarn5ut+ xuix g+zxap7-. /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 ame,na/pqrws (dr4pwk0rj. (io;k1 0gnd 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 areu+y07hrimi ( hvp+5q ra $0.20 \; m^{2}$ 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 f 4u7t+ybh( e8;sxwt/a lin4j qlies horizontally at a location where the downward componeys bxt/ w nai+ u4lq4h(j;87tent 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 rotatc+xi cf)-7geid2vfif 3hqp,oia 8q,7 es at a constant angular velocity of 2.0 rad/s about a vertical axis thrq,7fxa p g,3icfe- 7v+fii8i o2qcdh )ough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-section2sj4s nvse:7 jx6m+cc yxv:x8al area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ov/ 4i5e8unqaqz zei-hx)q;r( f 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 cm l,b.zwz5c2n,m/ x p pakong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rota5n mpz,zw.k/cbp ax, 2tes in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of yns a/m2zij86 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 s,kmmu1xktuu : 9pqu wgge06-tu)e+. output of 12 V maximum when rotated auxme ts 9: umqu.tkpu, kw1u6gg+e) 0-t 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 witdb u)xi)cuv0i:dp7+b/x j 7x lyv6oh7h 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 opexb/qr3;, xtox. a2j0 sg- apvyrates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ujzd1 izj*,:qn+/slm operates on 120 V AC, and when running at fu/:1mi *qlzjudnj+z s, ll 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 intern emq 5nua6;:myal resistance 6.0 W is connected to a 24-V power supply. The operating e:um6; n5qay mcurrent 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 resistancesqal8qcjyj7 aw0xw 5 xt7w-57 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at j-x5 0 5a7lxtwsqwyjwq7a 7c 8full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a a ev8 6x m2x9exgp+2yr24-V power supply. The operating current is 1.0 A at full speed. What i 8xpmax2+g6 2exre9 vys 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 neede:a sum+xi1bon;6 /gx ed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in 7p1/wslu*w1bsowfv 8 the secondary. How many turns are in thew/1 w su*81vp7fsb lwo 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 necessa8o f.znblo6 9try in a 110-V primary if the 24-V secondary has 100n9otfz6blo 8 . 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 ,2er8ro :t4yri3cs )* flfdwgsecondary coil. If the current in the secondary is 3.0 A, what is the current in thed3e s l f,otc)rrwf:g*y i48r2 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 g p:j kv.orc89primary of a transformer. Assuming 100% efficiency, how mangc:8j.ov 9kpr 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 5thmmrn2:t0l a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the nmt :tm25lrh0primary 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 tu8k7m4)bo vs ws8nel- crns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltae)m 8c-ss8v nwk7o 4lbge 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 3 e;mh+b w xknhis;+qn/d z7n;agq72o turns on its primary coil and 300 turns on its secondary coil. If 120 V ;3k/72sie;a+d;nhgwqob7x zmh + q nnat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its) 5;jt1t s2 )at8la pyqrs0qki secondary has 200 turns. If the input current at the primary is 100 A, we ls)k 5 ri1ja );28tttaqp ysq0can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turta4f) bj,x iq e/6 q:(xp5kmayns. If the input voltage to the primary is 100 V, we can expect the output voltaq ftk,mxe:/)j4 a aq6pbyx5( ige of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns andw8y(ttgfav mc95r8cf; 9 pa:z2c ehd0 its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power tfc8vm8a 99 cya: 2pe;gdwrh5 t0fz(coutput 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 usually stlu mx af,7f*.mthxv+f lk52-aepped up to 4500 V by a transformer and transmitted through a power line of total resistanchlfu,x2t.f f* alamx7k 5 +mv-e 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 1(z/a74lagt kl20 V. The voltage is usually stepped up to 4500 V by a transformer and7g 4a(z/tl lka transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage i+yrqm11m0lcff ,7 b uked )1his 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 the transmisslbye1k 0,cr7fuq h 1 mdmi)1f+ion 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 total rein :c w15i1ucd;wcuswn75o yth/ ;q *isistance 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 on/1oy 5whc;w15w i t iqcidu;scu7:*n f 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 0.6ps7d 5fo -xm*z s j/9cinoe78c0 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating o 7exj-5nf sm7oo c9/8pidsz*cf 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 V. How much p8w4)caf:vu7q1t *wd d,tsl y t8rr+aless power would be lost if the power were transmittew+)fqrw7pst r 8 ucd8lvda: 1a,4*yttd 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 onzm,z2px(9+ t c+tko/db;vonc a line with resistance of 0.60 W. To what voltage must the g z2ob+dvxt,on+ t/;p9c mz(ckenerator 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 current of 5.0 A. How much energy is stouj gr3i:mxnxy dg lj6++1+2dv red in the coil's magnetic6 d3gi 2+ xuvjy++nlmx1g:jr d 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 4xykw sv.vv rmc (0r;66.0-W resistor and an 18-H inductor. What is this circu x rm640 .cv;vswkyv(rit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuitia7+mb2p pwx 1 where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a h(v6 cc p ps 6p*/ycjkhmf/7d.120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 12b(;l3q6c 27x tmtugpf 0-V AC outlet. What is the resistance of the lampb;76xmttl(up3 2fcqg ?

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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 ton c vs ,zswss *4-6+p9cjsc(uo a 120-V ac power supply. What is the peak current through the resisuw,z(c+4 p s -sssovn*9j6c cstor?

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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 pow ;r-shec.lx5qk6 1qs her supply. What is the power dissipated in the resistor?-;excqrls q1h.hs 6k5

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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-Wi p-rv.x;uea -)up2vm 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 5qp: t cq.ww:q(0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistof obt8q e64im-r 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 onl4 q+dumv- ;qf 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 o7f6)m gyx :wp2.50-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 reactanceyf tf..nv(p6x?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10 l k7 x;5hoajo6g*;kpq00 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 whatritqd +x1nww(mn6-a8v c.g, :os5jen 120 V AC at a frequency of 20 kHz is ap1cnq- axms.j g twwi(8toa n56,:v +drplied 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:fo )n(kng bh89+9twp 3 kyxt9mh:elr, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive rq)e6c( s+p qxeeactance 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 capacitiyvw6pj*)eor jrb:be 50iawp cwj+(m,r5 :i8 n ve reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12008oho0kbey4/y 6b)np qm-du .f 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 cux g+5yr1m4aaapacitor be 100 W? uaxy 1m+5rag4

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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 capacifjn bk;e,snae6bl8 -q2 7zs/ok 7r1aitor 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, 1j-ps.6srmu-d pgsxo zjld, /*7-myk 45.0 W inductive ,k*.4 pjgj-rsdm7-/s p6um-z xsloy dreactance, 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 l)j,u.ls nb7e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie.l sej7 nlb)u,s?

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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,ihag1f kkja li: k(wiq58a.. 100-W resistor, 20-mH coil, and 1.0-mF cak8( l1 .af,hiq5aki: iwgj.kapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH 6jcj ca1f66w0zuk i1qinductor, what is the impedance atciaj66qc1 fu6 z0j1 kw 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 connectex 0 s.ky5vm l:jbf1mfij5c(s* d in series with a 20-mH inductor, what is the phase angle5xfmsmvfil51k 0c(sy.j:jb * at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and4l:lvins8:ifm7 -k m+ubit g9 8dmwr9 1.0-mF capacitor for a total i9v7di:s9wl4k-g fm8nblr i + m:m8 utimpedance 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 capacitance0 u6a*l.ck siys is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20sua*60 yil .kc00 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 with a 450-mH inductor at qy v7 ipl1p(hrn/+u x 5mcy,+e5000 Hz for a total impedance of 40000 W/e pyu+qnp vhx r,lic7 m1(+y5?

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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 1.0/0ofjg 9-st83ht(fznyy2 o *dnd y bn9g2ox;u-MHz for a total impedance o3 j;d/(oyf9 gx 9 *nyzoyoh8s2b-2dt gun0fntf 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)zp8z. rv, er6qq.bx khl/ex5 a 20-mF capacitor. What is the impedance at 1000 Hzxlqee.p r)zx5 r/.q k6 bh,8vz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is ne+lsowhkkpnh2 h*p: v;u*p-8 eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance o:hhkpo l-p un8e;shvk +p*w2 *f 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 ( fw63xjx r4enat 1.0 kHz for a phas(xf rw46 3jxene 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 resistor atk f 9kucf:2*9 mp(aj*o nb-ffl 1.0 kHz for a total impedance of 45 W?cff9n* :m kaf*ko-p (2j9ubfl

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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 x,nieh45v r ho5:ru2x is the phase anex45 r :irx52uhh,ovngle?

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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 dbwj: )l oe;y(V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ydb ljwoe)(;: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 resinvl1sqe*wijo))hls2 ol8-7o4 equ 5estor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz2e- l4v 5wnhl7i o q)q1ouo8je*) sles 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,f2eaqv8:rpa+jvaz oa,6 t *f8 and an inductor of inductive reactance 30 W ar+ rjq,aoav 8ep2*f :aazf86t ve 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 sey* 8hti: xil6wries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne:l ty86iiw* hxcted 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 resistor for ar o96n :uggm4cq+nxx4 cnm0o 1 phase angle o 4mc n +m04xq:o61 on9nxggrcuf $40^{\circ}$ 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. tr4c upx: 42 y4(bbrp xjny-v6At what frequency should the circuit be driven in oryr4( btc2xx :644-yvn bp ujrpder 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 12.0g zdoyg8 s2+7dqw. 7sq W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reqqwyg+zs27g7d dso8. actance, 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 ACi/xacqht6 / y/ 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 resistano4/d xa;(m-.u9y.cfc.hwxx s2u led kce of 30 W. What is the y2l osf u.9.cdd4u;wmah-.eckxx(/ xpower 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 series RLC circuit containing a 5altvi(fqya:g/) -f57 5ovt*6d vckrn0-W resistor, a 10-mF capkdqtv-(ofgnyc:5a l7v6 r5i/ta vf*)acitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0f0scqe 4(+hns jp6mxliu9,ud 3/ 3ypr-mF capacitor and a 15-mH coil in series? c4 iy dn6xsq(/3u+0,hj3mupr9slefp

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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 revx2g)x. hcn1;iq.rhb sonant frequency of 10 ix1.qg rhhn 2bx;cv.) 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 xlw5h/6dlvqu33j69fv +xxmuinductor for a resonant frequenhv wxjxm u3q l5lx+d9 6vf6u3/cy 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 ser,w r/lmi)iojk ik9 60yies with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit i9l irk0,y)i w/m6ij oks to be 1000 Hz?

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