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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 t dre0n2:c8ea are units 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 thatavj6;70ijz t, xj9s ye 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 qdque6 9dzlyv+so/, 5k0mei* of change on the il/5y+q96o ive dz0,d kqsemu*nduced $emf$, 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 thro j)q0.m(8lfs/t nv cv rorm2l/ugh a loop of wire produces what sr0 n8q mv(ljr.)ocv/ lft/m 2kind 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 wir ;o15* uttfyx8mol-bae produces what kind of change on the induc8*a; xt-tly15 fb mouoed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fie2-m lcvx,h dagne0vadf u4dd 9k7w6,.ld 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 x/)vejiql q /f;, krs+h6)i gllaw, the direction of an induced current in a conductor will bel)vgxq )ji+qi ;es, / k/6hfrl that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizr(obzb4 wya+)tv i6 lpc/2h) iontal table. A bar magnet is held above itscal+ihipob/yz4))26btrv(w center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held asag;+t *1 jf3kt,f 5hqj;pqufbove its center*u ;f+qffptqj5 ,agjs t13h;k 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 po6syxov8 o6 nxhr i+b5 a3x*of6ints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field farhn+6bf ooi*va o6 6xxy8s35 xdes?

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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 5aoh * s;x0ulqz zzac+:1 rnl1top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fiel11zoclx0 lqrnaz5h zu; +a:s *d 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 field98ap o 9qxdyhu3;p mjw4vwa7t +(csz,p.l a-b points straight down. The magnetic field disappears su aquol9s9twajbmp4pxp -a,c .7(ywv ;d 83 hz+ddenly. 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 t * d:rfp5oe)nm rle 1-kt/an3uable and carries an ever-increasing current northward. Two coils of wire lie flat on the* nme 3r1/ke-fo lpnd)5:r tau 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 entering fdp5gq +uj5t2t q;lu/kirst. As the55 lpd;tuuk tjq/qg2+ north 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 angula,hll7jw k8go d(i z-;f5zosl3r speed about an axis whose direction can be varied. In a region where a unil5;dz 3szll-ki7(oof, whg 8jform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed az18ytr 0kdrj7bout an axis whose direction can be vard0yzk8jtr 71ried. 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 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.ymt4 hh4;4s6oi xwcf-8y, o fq
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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 azfho7x 5u z *i/zff).*/7lv42bhl;z r mfdy pln $emf$ 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. The f3 85om1sw ap2ki*zf t$emf$ 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 thu3ti-6 k+qvq he east-west direction) is moved northward at constant velocity through a magnetic fiel+q -i 6tkuhq3vd 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 constqa(46m m2bce8a2ng ulxg 5j1fant 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 generator transfogyt5a74 lm/kn rms

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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 fr8g i w79crf+g3 )in8mqzji /rlequency of thjmn i g9qfigc7i +z8l/rw)r38 e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used +9ptwr y+vnz d0d2ir. 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 that(s i:g 9;jfhq,zx)vwui)og b *3g:dai

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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 contaih dm2ng au 4hidq(c26. d,pfm*ns more loops than the primary coil then di g*. mqp4h2a,nc2 u(dh6mf dit 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 contains more loops than the secondary codi,/gkspwx gq3 *oa 7 g7t(4cfil then it is ck/,i 7xt dqoa7s 4(pgwg f*g3a

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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 in5p. iu 0+ourn ,ak(d:scjjj(fput

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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,uy xdq-kj g.25

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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 batte7ug8s7lw k0 fpk46oqzry of constant terminal voltage. At the moment contact is made with tq4wslg u 76p8fk07zok he 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 psf z+g+. v;ry:*zcwz/1nno/e cg4y z ideal battery of constant terminal voltage. At thevc:1 zr cp; zyynnsw/+4+eozf.g zg /* 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 reseqag5 r v)bddo3jlu(36wx c4 7istance 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 resistanct 0wz4ts8d2qc y,3 s0htqeq, ue R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter uvgm2bg33qf3 y. The time constant for the circuit represents the tgu3g mq233b vfime 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 inductor are connected in series to a baj(ignib7 g2a ;w4 sre0ttery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tim4ir;naigge( 7wsbj20 e 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 2 b v0.ceai( +fahha io.q3d5pthe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit/qnf+uy1oe8*nz lu r), 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 thigahl)+7jo+ta1pcu * ys circuit, the curren1gtcyu+ a+a*p )l7hoj 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 what factor when the fp)ugww*u 62rr rf7si 2requency is triplrsrwur2 27p)6ugi*wf ed?

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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 doubled, the ind.) ezo8v; oqbzuctive reactan zbvzo).o8; eqce 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 an inductor approachemcn (*u ,: ndjm4i*oqvs zero, the inductive reac4 jmno(cim: nv ,**uqdtance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this 2cjaw/tt*5xy circuit, the currentt5a*wcjt /xy2

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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 changc+hj9r n,-lxm es by what factor when the frequenhmnl-r9x +c,j cy is tripled?

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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 ACp yoib vh.5tig/.tu 92 voltage across a capacitor approaches zero, the capacitive reactance of that c. /.g p29ttiivub5 hyoapacitor

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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 the inductor and capacitor:1 3tk4djtzo4i1s b or in a RLC series cirjizo1tr13 bo 44: dkstcuit?

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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 defl;-8 xs8; gch89yslszy a- jubined 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. 7:/g (vbqiz) ky+h cv-f k+7wwcew 1fi The impedance of the circuit increases if R increases. When is thi+ 1qfhcwy k(:+7)vwk7vgwi fbe/ iz-cs 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 circuamzdy8 z:bxh o2mmrj3e 0 6+*iit 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 14bjvdov-avml r g0;zp;p x7)impedance 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 double in an LRC series 4eu 3j5k2pv4ft2ml c ecircuit, the resonant freq 5t cj23l42me4e fpvkuuency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC appliedx abnsyc 3s ,p rn0:l;/z(d8et 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 ocxp9k7f c/owu li* t(,icurs 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 rotat tdfpr 6q2 *7gr8t9n gfs;id3o28luroing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the looo8lp 2g2r*ftr7qi s3fd;n dgt6r o9 u8p and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fi rva8,ob ru*n49iyqt :eld of 0.20 T. Find the magnetic flux through thero4b:iqtyrn u, v9a8* 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 ra 1p:gitbw-p b:;dse9 srto1j c11ub( adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the looprtjpt-1;1 ew :b 1p(uisd c1gbo9b:sa 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 pix4ui l4zd3v n2mf9r-t*fj ks8h r0*reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chh fu7 1; )g6/sxslylpqanges 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 frazacszclg3 p14q4ge fj )*w/hp:h 4m2fme with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changefz e/pw1q: hc*3g sflh4c z pa)44g2jms 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 wi b1 tr(6xggia, sj/-9*vjzmu wth 15 turns and 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 andzl9mu-ench0k d(8/jv p xa: nn96v+kl 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 where thv nnzhe3oa vu,j8y 4gy l.5l+.e downward component of the Earth's magnetic field is na jv ygoeyzunl 43vl8..h+,5$6.0 \times 10^{-5} \; T$. 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 rongg4z,p:h l5 htates at a constant angular velocity of 2.0 rad/s about a vertical axi:4 l,pghn5g hzs through 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 h.cniaoxyo(,/( w+lg ras 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 1+ 4z9drzl dnk900 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 loopyfp/*myv:n; sg pn 87p is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm av7:p*; sm8 yfy g/npnpbout 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 wire ojxg;of2zbp* ui/py/oc k-,:wnzld h)w2 r.s4 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 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 constru v-8v;:vkfeg;wj *4agwgtabp0 uv 8r)ct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A ma)w8ej0vvvgggv :r *bpfa- ;8wtua ;k4 gnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximumgn a7(tx9,hk7cf(y txad/7 am $emf$ 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 ope0: )je,mtnx+kc,3 bnzuz8if v rates 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*pl(n u i7qhfq y mozmm 07+,e:46sulf of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a*u047q7n lmqhpo e6+mz :lfuifs,ym ( back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t n t3ge2ddn9-z ug0og4o a 24-V power supply. The operating current is 1.0 A. What is the start-up currentgo nz0ne3 gd4 2ug-dt9?

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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.e tnckksh ),1t3ls1l3xr: z t-0 W is connected to a 24-V power supply. The operating current klte , 3cznsh x1tr:k)ls 3t1-is 1.0 A at full 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 g9 2xbeu u-fo7a 24-V power supply. The operating current2xfu-9ge uo 7b is 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 primar/p x; :4jqmz7y1jmv s9cu6rlay 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 transformerl ,mutz11t5eu causes 14 A to flow in the secondary. How m 5zm te,1luut1any 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 24-V seck*j0byggdu c 4bw/49)p6oxm p 1 pf,xlh-za+c4y4pb06xz/oh wcppak)jc 1ux *9-, bg dgm+lfondary 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 omwfb + 5r/;/qymy b m;-;xqbh+eivj,hf a 500-turn primary coil and a 2000-turn secondary coil5vmm - qhbw+ + jxby,erbhm/;;;qi/ fy. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. 74np2dlr2 o zghr6 4iz Assuming 100% efficiency, how manz 622pg7lo nhirz4r4dy amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tranqb9, avm+c .grsformer provides 7500 V at 10.0 mA. The paqc, +9bvrg. mrimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 t;xmxi3r1i 6ft kirfldrl62o5u(k8 5 iurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thm5ril(r ;kr 63lf56ix 18 id2kufoti xe secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns oxh*xzn +e0c- nv+4bga n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cunb z+ex 4c- 0vhg*ax+nrrent 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 i, 4lchm ) i1*n1 3k4zjcgfbqmturns. If the input current at the primary is 100 A, we 4k giln3b*, 14ihm1jm qccf)z 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 10uc*)hyz+hb s1 a7p-o s0 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expeo*+p7y shb )cu zhsa1-ct the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 zllk ;+71 :q 9hhx g,gxmg(al/fg)hec turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to zgh1mg fgx9kllh+ h)7l /qa ;,(egcx: 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 usual1( 3f s7falaxu7k +ucj3drf9r +*qox gly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondarykxu(d7 7gc 1rs rl+o+q af3jaff3 xu*9 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 120 V. The voltage is usm6dw6yum)ijzk65em3 n q )vfa 94t:lkually stepped up to 4500 V by a transformer and transmitted m:m 63vtmqjl6w4ki)) a5dz9ye6un kf 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 cur7.z9y4beo c kxp6to/di/9ho m rent 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 power lost ipc zdk/9o mo6/b.47 otie h9yxn 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 r q mv/gzc1o)zf 6bz.,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 percen m/,gczfqo zz).b1r6 vtage 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 k(yd jadx)j9m12tsl0 line 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 perce0)sjd1 jld2(9 t xkmayntage 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 muxo,i:rood zbe0 n+e-s.ir f)*ch less power would be lost if the power were transmitted at 3000 V instead of oo: s*x+ero r)f iez0bi-,. dnat 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 tr(wzt(igxvl;/ dv2j g8ansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformtzgv/8v wd ixj(l2;g (er 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 A3u;.objj rse 0. ;jzmef8 xwi7. How much energy is stored in the coil's mmxw 3 i8jjsu;eeob jfr..0z7;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 qjs( p,iy9bk36.0-W resistor and an 18-H inductor. What is this circuit's time ci pj3(yq,s 9kbonstant?

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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 whk8,vu u) b;zlrere 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 outlet. What is to(:e5nsx14(r sfiw 42rha l+f j iggy7he 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 resisud,kkjj +t490po6q u; xtybt s.g5(yotance of the lamko;tgdp 0 xs ujjtyo95( u t46y,k+bq.p?

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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 supp -1rmb8*wq - zlvtyvu9ly. What is the peak current through the resistor?w*b9zy -v8tql1 vmru-

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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 con3gciny/3 if l1nected to a 120-V ac power supply. What is the power dissipated in the resist31f3igclyi n /or?

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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 fh lriv1 bs(wcxj )5.+resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistqz r5esl7gg;.c+i. vfny:x0 tor 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 resifa,gb;w l )2ugstor 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 60 Hi* 5b dx57ngyyz?

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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 z) mm)ria.,dvh b2* yu* vfrt,of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency willpc 4kbv;gqp 0) nnke 7duo)*r( 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 necesz:yo q;,egfz j 9bh)l6sary for 157 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-mH inductor when / kzgez3uiks fp+*)clv.3 y0t120 V AC at a frequency of 20 kHz is aek 0lypc)3s+3 z vk.f *z/tigupplied 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 tp6b;ly2xb a(ua t6* /ykwde9r o 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 reactance of a 4.7-mF capackj:x xu x90d7fitor 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.,s nao57bz*ut h: dci 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 capacitor have a reactance ofgw7mnsgz-nz,n8/2q k12 c iuo 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 capacitig*wv69w 4ygwpa(sy-2) ycn kove reactance of a 0.010-mF capacitor be 100 W? yv 9a6-(npo*cwy2gw kw s)gy4

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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 0d6my5v)8rao /qsug34s f+*9t dsjvu j.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 128r hdjb9y0r8uua 5 .,3dsdttb.0 W resistance, 15.0 W inductive reactance, and 10.0 W caprjby30a8sub8 5 tr.tdd9hdu,acitive 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 g 7uy:9yefdi8 8sy*pv at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito:8sy ygefu7id8 9p *vyr are 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 1500 Hz if a 100-W :mn * ,ghe3lr4ci bu2iresistor, 20-mH coil, and 1.0-mF capacitor are connected in serie*inbcrhui3e:, 4m 2l gs?

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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 ipwuirc)g y 6,)n series with a 20-mH inductor, what is the impedance ac ,gp)y uiw)6rt 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 series with a 20-mH inductor, what is ney : ujyr5vom*i ,9+othe phase angle n rm v,+:o9eyj*o uy5iat 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 ; 2y2 2x2 d5g+g9fpso re5htnwt*ewye series circuit with a 20-mH coil and 1.0-mF capacitor for a total im ;np*+9segxw2hdy rf eet t252ygw25opedance 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 serip)qs 0x;g c6goyp2v-yes with a 100-W resistor and 15-mH coil to get a totgpvxp62;)ysyg- oqc0al impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a5+turu2y a tg8* dyz-c total g*t 8cz+ya2d uytr5-u impedance 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 inpl; pw5*wwv6 dnec ;v2 series with a 100-kW resistor at 1.0-MHz for a total imw 5pd*elw ;p 6wnv;vc2pedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wi g d8s 94i(n;8rwml krxj/7bmawupp1/ th a 20-mF capacitor. What is the impedance at 1000 d8 (rji4; l/mankwb9p/rm 18 gswux p7Hz?

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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 for a tot zz uu9c5xd1z-bwm ;+.zvt l/lal imped9l-t z +;z/x.ldbwumzzcvu15ance 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 n4 lznqvy-n;ouf 9n35 ieeded in series with a 10-mF capacitor at 1.0 kHz for a phase afqn;34ui-o5 9 ynvnlzngle 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 s qxk:zk.id-.needed in series with a 30-W resistor at 1.0 kHz for a total impedance qd.-ki:k sz.x 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 * xl/ *tdw2wwg- dnxpxh 9;ib6qi 0yt;series with a 100-mF capacitor at 120 Hz. What is the phase an/ wt6*i;x-dwi9gdnqbplwt2 ; yxx0* hgle?

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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 1508yq9y(ik e c8/8 q:flphd+idbc7ij+ l0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i d: 9ipc++8k 8hql8q /byi7yiecjld(fn 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 104 *xd)nd8terq0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is )q 8e*xtd ndr4the 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 capayym:5yyg-vk( uhw--m yf j9jc( .y rq/citive reactance 30 W, and an inductor of iy(qj: cg mkw.y yvr -h (y95uyf-y-mj/nductive reactance 30 W are 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 resistor, a qd :u,7tq;6 qvnlkl8ks :sti0 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s0nl k:s7qivt 8:,kus6t q;qldupply?

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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 ser/hrd dr q.3mthykt3+*4v sve;ies with a 500-W resistor for a phase angle ofe*h; /v4d t h3d .mstkyq3r+rv $40^{\circ}$ 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 fre ;rrx)yeuf(pjm am3 04quency should the circuit be driven in order to have maximum power transferred from the driving sourr (;)0xy 4fapjr3 umemce?

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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 W resistance, 15.0 W +;0 sz8phaoyoinductive reactance, and 10.0 W capacitiveo8a0pz+ hoys; reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is c 5qi8tn ;,dho$63^{\circ}$. 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 ac5 9,;i+ .jgclipkym4 t4xcvbn impedance of 60 W and a resistance of 30 W. What is the po+ x b .gjimkc9p;cc i5l4ty,4vwer 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 50-W resistor, a k4+ka4 *dv4kgzv wsn 610-mF 4kk azv 6+ d*w4kgs4nvcapacitor, 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 1.0-mF capacitor and a 15-mH coil in series1h;ohl olko56?; l1 oho6ohkl5

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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 kuxy5 n8 akph21cf ,xgz68t e,in series with a 4.7-mF capacitor for a resonant frequency of 1zck65,18 8fhy t xap,genx2k u0 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 xwj wr t/)tm-zh*v(8w.7-mH inductor for a resonant frequency of jw(t8hr mv /x-)w tz*w1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W rey/x h/xe5l) srsistor and a 40-mH coil if the resonant frequency of the circuit is to be 1y sxhex5) /r/l000 Hz?

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