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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 uvscc4 )) 23s;+ki ymasgs kmx2nits 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 states that br 1:dsqwk 7x+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 cnbyih10s+ mmy90yb wit(v 5z5 hange on the induczbny+i sm 550(9ityhb0 1wyvm ed $emf$, 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 wirev whu6nzm *:p- produces what kind uz6v:hmn-*w pof 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 on:1sg,l9: ada imwpyd9 the indupa91: wds 9,adylgmi:ced $emf$, 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 mq 3 ut7cmea8ch++7l eaagnetic 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 curre4doaf)ykw 64z nt in a conductor will be that which tends to produce which of the followingf4ok za 4wdy)6 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 i:dbk6a8v z,c*zf r,)wsq6c gmk-x 5 jtable. A bar magnet is held above its center with its north pole pointing down. Thj6mq:fwc g5b czzk8)i,vxs-rd a, k* 6e 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 zu00nlt,71n ) n,(hcy9xxvt w3zvxo non a horizontal table. A bar magnet is held above its(x 0x 7z ),xznl vt3oty,9nw cnnu1vh0 center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector x4g + cyb4fb4spoints straight up. The magnetic field vanishes suddenly. When viewed from above, wx sf+c44b4ygbhat 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 magnetic field vectoe7ow qvm9,6k+dwdh 1c.s n8aor points straighte.17wo kn68cd,da qm +ohswv9 up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whtfqj 2 h4 m8utg0+8tyyere the magnetic field points straight down. The magnetiyhy8 +fg 2ut0t8j tqm4c field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and ca).u jhxpq)2sfrries an ever-increasing current northward. Two coils of wire li)sjf.h2p )uq xe 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 thro3u dz/ af,rmouz si0/;0oasrzw 2:rl 7ugh a loop of wire with the north pole entering first. As the north/zwf;0:mzriz7/ l,2ro ausd uo0r 3s a 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./gm ad.gpl/z angular speed about an axis whose direction dgmpz.al /./gcan be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation 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 wc,eqp bx5+m, zire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strai,c p5,+xmzeq bght 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.lc2v.o7 ir+he
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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 tha3 oqb +;)mfa-8ehtq;ah z(. cuaawn-st 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 magnetic field. T5k t,qz+r3u kv6qa(5 qr8zvi +anauh1he $emf$ 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 dirsn l7 t3rs60dqection) is moved northward at constant velocity through a magnetic field that points straight down. Make l n70qtrds63s 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 angul5yv .qkpv,7 zdm9 md:rar velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans6, 3yu4zjhvm n er nw6;r*who7forms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency mv 1*uyj*c6 pzzh;xow-jyyfh-1f s;e -s an:6of thz*js :1-1syzy;hxvhf j u* -y ;66e-cpomnfwae $emf$ 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)xb wv1 avwo d+3(nti9 do 1-+-zalrka 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 de3nr aik1 g91tps v:e2e-4rdmnvice 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 secoty ud v8q83lys jla 3hn40a,3cndary coil contains more loops than the primary coil then itujlaq8t3 a30 ,3 sv nyhy4dcl8 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 conn+8ixn,izc u4th5lu+ zlv 91wtains more loops than the secondary coil thlhicznlunvx98 i ut 5z 4,1++wen 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 po;ftf-tf go1dym 7n 9q9wer 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 circuit,w+mk- ozh/t8mqox2 *h*a 0onn

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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 i:t -l4lr 5 x mcakqu0q.a(2woldeal battery of constant terminal voltage. At the moment contact is made with the battery, the volta xk50m laqwl2(tcua4 :-rloq.ge 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 img34aeoquj /4b6b .lz n series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, theqlj4mb 4uz6bga3e. o/ 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 inducta/zqj lkph5 ucj5ua5( :nce 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 inductance L and resistance R iap-4 dg2wi/k as 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 inr7hz2udv gqut0. ;oh 4 series to a battery. The time constant for the circuit ; .hd4gtqhv0zu2r 7uorepresents 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 inductorc n -q8i;qk.os 17znpy are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curc.p8qs-zoqnki1 n 7y; rent 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 sa:e0;w;j4ns e*s ntt2jiy;g hy me units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, th(fm+xqy *lz1 w(ss(e1 mr dq8te 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 thithb(1sbco 1- t59ixj rv-o x8gs circuit, the currentj-t 1ibgs1xhrto (o bxcv85-9

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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 b s3ibshac w*+ lmlh238y what factor when the frequency is trih asmc2lw h 3i3sb8*+lpled?

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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 v5qfb ep3o5 ;edoubled, the inductive reactance ;e5q3ebf vp5o of 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 voltage across a cuy1am1 h95tln inductor approaches zero, the inductive reactan5 uam91yh1tlc ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply.n /xv5/p;yx 3bmjsko4 In this circuit, the currentn;m/j kxvb/5pyo3 sx4

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance n69:b b g ;3ygmf9sawyv8d6 xpin an ac circuit changes by what factor when the frequency is triple6d; b3yv 9yga: 8mbw6 fsg9nxpd?

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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 sz l/itl, 7gd0approaches zero, the capac0i z/tg7l,sld itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of thep r k*p o u2d/h-76eq(1vjwwpa inductor and capacitor in a RLC serie6p q-2u w hp*/ d1(v7eopkawjrs 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 cp n :amxflx6 1)n-9vweircuit 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 increasohewx49ij drp5v;gq : 6k3 f;ses if R increases.qjk ;feg9 3o s6pv4wi:d hrx5; When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Thext )chohekim+0 q9 8g v)wy*1c impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit id6 lvs/ y)9gdbncreases 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 double in an LRC series circuigy um/*rr 70qjt, the resonant frequency of that cijq7 /ry0gurm* rcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. rrn91j/ lom ))z:lqpvAt 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 circ+cc sfil w*:v6o oi4 wl3s,+ewuit 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 0.105lgwj j i7c3*a m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flulajcwijg 7 *35x 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 radiuc80 9;awwfh,nr7lj fxxbr6 m0s 0.10 m is rotating in a uniform magnetic field of 0.20 Tlrah 879j0xw c ,;0nbxfrfw6m. Find the magnetic flux through 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 magnetic fionng1i- 3i* z,xwp)zxbl(/ kreld of 0.20 T. Find the magnetic flux through the loop wh,z*oxrwxnb -i) g(i/ zpknl1 3en 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 reduced 0 7b*; q5yk4dhrwhothfrom $1.0 \; m^{2}$ 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 changes7v, u thha8 nne:71zii 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 sides 1i+ryd 4k9 kz(xz-f5d6 .fppke8 cm. A uniform(kze4p.p56dd- zkiy+ kfx 9fr magnetic field is 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 and an arelyd s-tmij3n8/ l+82 dteypoq0bq,+ h a 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 aj;a 5vlmqt( ll( va1pt9k 8no0rea $0.20 \; m^{2}$ 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 flies05c:qymxg i98 gs+teg ht;f+e horizontally at a location where the downward compe t;5+9msiq+:8f h0gxy tg egconent 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 veloc07c0tqym3.ob/t y zuiity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mag0t7y b z3o itcqmy./u0netic 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 generatoriowaag j2gdel6 /o 3;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,pgg b d83tehff+g7maaie 8(kn -( q6d 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 $emf$.

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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 rectangulrx4 av awfmlz1 :05vs+ar loops on its armature. Each loop is 12 cm long andfv4v051l:wazx sarm + 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 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 wz d2 .qz5wj3pr -f9n p7z (u2hdrdii/bt/p5bpire 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 iez7(obx the /f630xyqj.h 8qoutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of th xze 7yt( .x3h/6bjqif8h0oeqe 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 generatez : 5azp4cspf ,9x,:yenz jb6or 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 b, nfvwo7ur94 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 resis8o8+ j+m;ij.( wiintxw, lznrtance of 6.00 W. The motor operates on 120 V AC, and when rul.+i8, (n8zini m twwr +j;oxjnning 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 i1iwt2c07jd 37wage8 cpgl j;cs connected to a 24-V power supply. The operating current is 1.0 A. What idj jcw2ea1;pcgiw77 30cgl8 t s the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resav uks 5m4nza7i(3bl (istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed35u7avbimsn( a zkl4(. 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 aw xe onqr/wzs/*g0mhx): wx60lt, sx5 24-V power supply. The operating current izsxxw/lxq0o0m/*s 5w )e n6 :xwhrgt,s 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary n 8xhtvx4 u:,kw k9tn(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 trzkx.e 4v 8pf4wmef+ 8ransformer causes 14 A to flow in the secondary. How many turns are in wfrv z8p4+ e.ke4f8mxthe 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 inj5+ ur zz*r/ojl*r *sy a 110-V primary if the 24-V secondz/5r*zos* lj y*+rjru ary 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-turn primary coil and a /eidbk*gm8y8 ju,q k-mb(+e) ym/ulu2000-turn secondary coil. If the current in the secondary is 3.0 A, what yu )8(g*buu-m/e k/mde8 l,m+jikqbyis 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 tq-(11tsdqzkmo( c)b of a transformer. Assuming 100% efficiency, how qt d1-1o)tzbs( (kqcmmany 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 9g 6 3.lltgoajec7wx 2cl ryje p753+dneon sign transformer provides 7500 V at 10.0 mA. The primary coil operatespdaytcw.7rll53j9 63og +le 2 cgej7x on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 1 zck sh+-pptg /p7/leturns on its primary coil and 300 turns on its secondary coil. If 120 V at-7e+t ks/plz g/ phpc1 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnpd7s 9) usn/+ zsa+yjes on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present9z)d jps 7+ y/u+enass 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 qd*pzc g)lv.qyr c7);i;n hp,secondary has 200 turns. If the input cpp;y. ;,qhrcnlci)d *g) qv7z urrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its qyu3bx)6v t3y secondary has 200 turns. If the input voltage to thqb)y3y xvtu36e primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10wu-*z/yv 9.5w ndmugw0 turns and its secondary has 200 turns. If the power input to the primary isn m wuy.g5w/ d*v-z9uw 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The z d8gew* g7bj96v4b mu5:a xtxvoltage is usually stepped up to 4500 V by a transformer and a8ug64gbx*z tv9x j5: bdw m7etransmitted through a power line of total resistance 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 osspkg9-gr) a 1f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer andr)9-agk1sspg 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 bv-t t 9emz28xof current at 120 V. The voltage is usually stepped up to 4500 V by a transformme2 x tz-89tvber 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 kmz5 t 17fvyu;fc*6aqnz long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due t* fcn ay6 f5tzq;u71zvo heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if 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 .c;m4jbft un9qdgj2/g(mc 1ahas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer j1 gu 4cc9fa q(;mdgnt2/mj.bis 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 downe/v,:ft jaz4tiba( fgw/-4qn a 6-W line at 1000 V. How much less power would be lvjft4:/ z a(/ie qtgn4- fbaw,ost if the power were transmitted 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 at3sh a.p-+tat h 20 A. It is to be transmitted on a line with resistance of 0.3s htah+pat-.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 a current of 5.0;x+j.wik gb 3l A. How much energy is stored in the coil's mw.kxl gi+3b;j agnetic 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 inductori (uypxb+sr :(. What is this circuit's time constant?(:bix p( +suyr

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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 voltar sdo9ki pz)40., 2ekkeebktzdg 0).vge in an AC circuit 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 120-V AC outl( ,yaiu2orv-ugm nt8 0et. 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 ozy3tnrup ngw* i7p6e- gl; 6*uf the lamw l*7 6 pi6;3*ugyt-ugrne znpp?

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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 cux9gg3xz4yt c uz.jw a(+*o;orrreny9ga( o.wozz;43*u xgcj+xrt t through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. vboy;,uiyb6- What is the power dissipate bbo -y,i;uv6yd 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 ru1owaf.zt2ifkbl7 z 6wt v /e84 e5f2zesistor 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 resio3o j/mfxbss7mj4-cv; :x 1tystor 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-r kyb, 35z8dj rd53ndxp;n0qxW 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 1.0-mH inductor at t j s(d+t4k7js60 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 coifl+; /quc-d/j xrn(u8 yfla p;5n r:pmoesn/)l 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 4cj z6cgmxxbi44v2- vn068 xpt ixni+a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hvfuz xhf07ct3nc:c 7+ to+j3cz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of wpbtqr:*dw7l 2 bio+u1( - zzr7ajyb5 20 kHz is applied to it? d 1o 2l7*(7twb+y5qarwzi pbu:bzrj -

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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 auu1s 0tg rsd24 2.50-mH coil due 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 capacitive re9 e z8vurxm:2ujl0 s: gqoc-tq-dec ;3 gbw;,aactance 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 havh,vep7 1*h6h 8br t/cyrf/ywve 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 doe b4aszt75(uq es a 10-mF capacitor 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 wil3vfjrx 4gds: no.j-ti3wy :k( l the capacitive reactance of a 0.010-mF capacitor be 100 W?4gi.w :rk t:j vs3oxf3dj (-ny

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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 capacith1+ hjasja2: tor 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, 15.0 W ius19m d*ms7p:hihd9 k nductive reactance, and 10k9 7d 1i:ssdhmpmu9h*.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and qupfb:)/ap6ezev pf6gg(e 31 1p.nmy1.0-mF capacitor are connecteep/p.g( 1fpv)qyu 3 1n ebagfpze6m: 6d 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 anjbl,s(y :*o3o5yoad kgle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF caob :d 5o(kyj,a*lsy3opacitor 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 wq sv:f23key(m,6a jn/bqtaz(pd kv r*:qy;( nith a 20-mH inductor, what is the impedance b:a ajnqrf ky kydv/;(t :p(me,*vzn(qq6s 32at 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 connected in so 2 v7ysd b;ix95eg/mzv mx9;yeries with a 20-mH inductor, what is the phase angle at gb z m5syex9d v7yx;iom/29;v 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 coi v5y (x kvewcozl( qt(4f79ie.l and 1.0-mF capacitor for w ozv9q(ik v5ycl7(ee(f. 4xt a total 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 serie .7p8:krt /qlpaf gtg-s with a 100-W resistor and 15-mH coil to get a total impedance of 110 W a.pg7qag 8l-/ t:p ftkrt 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 with a 450-c4(. d9hhdkp wmH inductor at 5000 Hz for a total pkcwhh 94 .d(dimpedance 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 pyq*sx .x9 5 xdw(aqe/ yahj 1)8c/lirfut in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kxd q/5(8jr 9.e)x i fs1qaylx/*acy whW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the imped yy49khgbl ;( xz0drw05w( +xi ywc) szhw.qd1) (lcx.z y0w5w+r9s0b4d (higq kz;w1d xyywhance 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 1.0 kHz fo weyg9r68*ysb 5x9bycr a totalygs*cx 5 b8y e6ry9w9b impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at jfhl62ub*: scx;vb +k1.0 kHz for a phase an kfh:6vc bs+x;ub* jl2gle 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 at 1.0 1w73tcpd) ) zca7nit gkHz for a total impednt c dc)ig1 wz)3pat77ance 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 the7quqczpv ,+ y* phascyzp*q +q,uv 7e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mk 9ddqr/ /t1)jqth4d vH coil, and 1.0-mF capacitor are condkt dj1hqd9 /v4tq/r)nected 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 resistor, a 10.0-mF capacith9iud9ly (k-x or, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cir(9x li-khuyd9cuit?

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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 Wlv kjz*-b4dp ;iw+g;; y4dfxi, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What ;j i;vg4*i+4dlpyw z d;f-b xkcurrent 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 conta,h-rj j98)q)qyoj,h ; awvnbaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu bhqw,), 98ajoqa h)j- y;nvrjctor, 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 i arrr.;iylnz3 ,i,o9hn series with a 500-W resistor for a phase angle ofo.a9r zil, ,3r ;riynh $40^{\circ}$ 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. At what frequencyrrb5zp ,js o5k 1o(p)d should the circuit be driven in order to have maximum power transferred from the driving souo) rk551bjspr(dp,zo rce?

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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 cw ).m2b)eg kogha-f 0 go;aip2ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected tboigp-) g2g wk2ae); h .of0mao 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 circ+ ilj8c-k/dbpuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W f)n324fghmw nh+wseb:;/gw l. What is the pow+gwbh 3ns2 em4f)h:w;wnf/ gl er 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 50abe3l/(m 91(v hg sphq-W resistor, a 10-mF capac9ahmp/ elgs ((vh1 qb3itor, 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 eaw io27hxp kex 6,l3+a 1.0-mF capacitor and a 15-mH coil in series?x23+h7 kp,aleo6 eiwx

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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 fo 20 w:1siivqrpjac2s6r a resonant frequency of 10 a01 wvcr2s2 j6sp:iiqkHz?

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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 i8fkm2ck1m,47ac5zfie :aur .bzs 4 kfn series with a 3.7-mH inductor for a resonant frequency of 1000 Hi b4 .z1efka :u5, m24mk87cf rzkcsafz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-lai z 5+0upjhg ku82u;mH coil if the resonant frequency of the circuitu8j;zu5hug 0+i lpka2 is to be 1000 Hz?

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