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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  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。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 magnetiu7- p8i5 ab7jh3 zuosed zu7zpa/3d2p c 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 tvz6 afrhz )3es5wh qy23 +l4qthat 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 a9(*osrp0a w zv coil produces what kind of change on the inducp0r(v9zoa w*sed $emf$, 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 tw4nhn c6ol9y0o02oaay 5 /mcdhrough a loop of wire produces what kind of change on the incym 9 yndh6 0a/0anolc4o2wo 5duced $emf$, 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 diametez mnk0g d3x0a3r of a loop of wire produces what kind of change on the inducd 0m33kzg0an xed $emf$, 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 fie+ypm6 h3o uh8fus5(wulyu4 v-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 law, the direction of an induced current ink xl5e vt,8w/t a conductor will be that which tends to produce which of the follk wx5tv,/et8lowing 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 ahum mao2km6(; vy/i .u horizontal table. A bar magnet is held above its center with its north pole pointing down. The u( /;a62m uomkyv.hmi 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 is7qtmwjb7m29kw2 f ubhh+g n9: held above its center with its north pole po2 h hbw+kun:fm7tq2m 7w99bjginting 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 poin(3pxlcnb6.wfs5 s k-ots straight up. The magnetic field vanishes suddenly. When viewed from above, what is the selsw5s.3o(p bf-kx nc6nse 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 tabgg0 m(9 5ap3jvf9 c2gjrhnee ,le top in a region where the magnetic field vector points straight up. The magnetic field suddenlv 20 h9rjgcgef g(n ,p9a3ej5my 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 )n y9 ud5kurp5 z83:ocatag)i region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the 9 ayuck5r) d8np:gi a 3u5)otzfield disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing bkb7*t8mc(iwv2 a g .bhc2b;pcurr vbc.87m(t22aw;bc* hbgb kpient northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 3 f rc7vg1zuri;o )/sj As the north pole enters the wire, the induced current will be (as viewed from abovegz3 f71o r/i ;rvjsc)u)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ao(e4ejuh 6f: en axis whose direction caje euf(:6o4hen 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 wire is rotated at c ja80/x7ao2fqpkpdp)onstant angular speed about an axis whose direction can be varied. In a8 /dpf)opx 27 p0kjaqa 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.z+hn:;c/ e3lc s n,kad
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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 ihs /kq-6,gxrthat 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 ytlrl.e xgp ep,k*v2z5d(9d -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-we7sgd0q2 a wj13f vx2fmst direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indums3qg 1fx 0ja7vw d2f2ced 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 constand6e, dcbh+5vct 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 transgl;;y maizefaa v562;forms

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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 fre .8 m6spejoyh4quency of thesjo.ey ph468m $emf$ 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 devicqz ojb+0u (-roe 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 deva0-juz-z bhd , 1at8mzice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thakryl q.e4b 8:q 72nyevn the primary coil thl e78.q kny4bq y2r:even it 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 th+ e8s+v,,s rrgcd9.*vnmcpvc e primary coil contains more loops than the secondary coil then iscm+ r v,.e *8c dc9n,gv+rvspt 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 )ch:*bu vrvuv2pk27 vinput

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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 circui1z/ havane x82bd*1a pt,

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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 ar21bxfy/ gdbigy /0ndo/ xvb48 e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the b y1yivgg0/xbb24onfdx/d / b 8attery, 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 connecetl3(hy jj:c-n57a vpted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrose tac(y-7vnjh p 3:jl5s 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 ig,+4qe e85ct yrjct:9w( xhrk s 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 indtpm6(pis6;px : w rvd1uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an ina+g* l go+5u2ckdjrna,4s * peductor are connected in series to a battery. The time constant for the circuits+lapuag5+ r nkce d *,jog*24 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 inductor ae ,5 g(n,wdkknn 0c*ttre 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 current to decrkg( k 0ectnntwd *,5,nease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units cyr78a7.a kgl 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. v *yp+oxrrbag-q3l ,- 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 connectenl .8i a3cqzm,d to an AC power supply. In this circuit, the current znci8 l3qm.a,

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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 chanqc7e1yrjw/,7c ku4za ges by what factor when the frequency is tcj 47y e7 w,a1czrq/kuripled?

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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 dfu2iqzf-kb1hiwe u j4z 16;4uoubled, the inductive reactance of that ind1h bf; 4-zu4qwij uze uk216ifuctor

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教师可以抽题组卷或一键复制本试卷，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
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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 .)qm5clkhb 1k.2wa aC voltage across an inductor approaches zero, the inductive reh2).qm wk1a kbl.ac5c actance 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 circui u+- ox2d iafw.q3:aaqt, the currento23ax -a .wqiq:+fd ua

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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 changes by what factoru6 ldp i;*usr5g,r l8y when the frequenu;g 85ysui lr*l, p6rdcy 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 AC voltage across a capaciton :j*a-p:ajqbdy xk 99r approaches zero, the capaci9y9bjda:p-jakqx *:n tive 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 t y 5wsu),; uhz50tvvc gyu+m8 jwv.yn(he voltages of the inductor and capacitor in a RLC series circuit?yg)5.+ws m 0hz u vvu;uc(j5ntw,yv8 y

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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 dei8( an - aupjfohjz-w8a318x76zne9pou4yt rfined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R inct0kqeu:-l mciswquf3. j 1 :(hreases. Wwf:q u qh0 .(sme-j:k u13iclthen 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. The im)t.ui;gn ul2iq:k(dwt cc ;z.kl wd9 -pedance 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.niy b:sx-/ zq 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 douw7mme n :h x+dtl5)9e7js6tbhble in an LRC series circuit, the resonant frequency mltj 9:dhx5 meh)t6 7 wseb+n7of 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 applied voltage. At res( +wb.gnoed(; yuda3sonance,

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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 on:l(b7ro 1df occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic tp.8s:,nao nj nfde n.5 qf+g2ri:.brfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ao:n5r8 eqpb f., . ji an.tnds:+r2fgnre 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 magnetio c h2cvx+:((d8to ifzc field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular dct+vxf(h82o oc(i:z.

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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 maidi s 7zli1*+b,akj1cgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are*d1+k 1si7jzc l ,aiib 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 s9nep2+*gfpws8j8kpk 1j)p c loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coi8td(oo* 8anesmgf,dch33 :jn7 alm 1ltk(. lal changes 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 fram t xxvr,a 39q(s.+wcsnwn)l 7m*nh va*:u hyk+e with sides 18 cm. A uniform magnetic field is applied pev)h*rnlswxqtusn h xa 7*c++yaw:3vn (k,m9.rpendicular 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 an m-67ql, z qlbwunl3yo2)rg5n d 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 arek6hq; cys2jo2dqjj 7; a $0.20 \; m^{2}$ 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 sp i vvniif1) t/(tf(aw7an of 60 m flies horizontally at a location where the (ii7/ivf twvfn t)(1 adownward component 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 constanmr)52e+pm cc2l3k dowt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a con3kmec clow+r)m5d p22 stant 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-sectior l i4r jxslz:g298y:.w*v9 fox(jhif nal 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 10s m1 .pczjw9jlk176 y*uh:fst+cl 8gq0 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 rectal eee.:)5bhk96tr dacngular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armbd6:le 9 5)ctkaeeh .rature 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 wire of arehay9gv9,33-.yupdhd cyfnp qo1o s*(a $0.090 \; m^{2}$ 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 outputk5i g4i i6f3kh of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area oi3hg5 6kifi k4f 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 genc5qnu-1fsu.u- ecrv. erator 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 ha9p4i7rq mtbm;jiy 8 d1ve a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00e+iu+fh )ptwemuo:.q0n8 :jh: d uap. W. The motor operates on 120 V AC, and when hhpuen d:ti+ m.f:uu+p.a)ojw:qe 80 running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powersvg1;f.yd*pio u)c ,x4lyv -n supply. The operating current is 1.0 A. What is the start-up current, nvsyxul;pv go*.i)fc4dy- 1 ?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pow scosp1+hr)ml 86fun5 er supply. The operating current is p16 +l58)hso unfsmrc1.0 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 resistlf a7geqhryj.d ;ih ((-06zzcance 6.0 W is connected to a 24-V power supply. The 6h7ye0r zhd f.l;-gq ((ajzic operating current 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 primary voltage o9h j5nvbw7 h70z yrp8kf $120 \; V$ 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 y5o3u+m(ler,fnn7lb to flow in the secondary. How many turns are in,rl 3m7l+ nobfuen(5 y 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 nech8tary+8 p o/;k s/jwbessary in a 110-V primary if the 24-V secondary hasb/8satp8ry k w/;j+oh 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 c73wxeyvvw++tnr bj9u 14 u )atoil and a 2000-turn secondary coil.wu9b vy uw13tvt+)nrxa74e j+ 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 prr8n g.nr+fo; jimary of a transformer. Assuming 100% efficiency, how many ampsjg+nn .o8f ;rr 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 trar1gk n;bssw+0t)2mf 4xns x.r) ls+s qnsformer provides 7500 V at 10.0 mA. The primary coil op1nn+r+gx4w ms slqs)s2;s fx t.r0b)kerates 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 turns0444 v8vozr: hozoufqy /rbp: *xzf)k on its secondaryb)/zqokr0z x* 4:yvho frov 4z4:8pu f coil. If 120 V at 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 turns on its primary coil and 300 tur)ejnvevhr48k 0hw 6 e7ns on its secondary coil. If 120 V at 2.0 A is applied to the primary, 0n6)keer7 48 vhjhewvwhat 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 10fc q-g7 zq,bij3m0 yx ja5s;bb0c,s1d0 turns and its secondary has 200 turns. If the input cu0b-qm5qs;gz jfi,cbx 1 jy ,3b07sdac rrent 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 secondary has 200 turns. pz*ll5,z7svtr/cos- If the input voltage to the primary is 100 V, we can expect the output volsv/zp- zl orc l*75t,stage 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 and its seconxvkk/f *drxmh371 9 uzdary has 200 turns. If the power input to the primary is 100 W, we can expect the power out* rx1m/d uzkk3fx7 vh9put 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 6ev+wusi7n f*tir/ w7q5 ;hsh4-z+ ybg0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tran w/ g- eh+q y47zn5i7u rsf;wb*t+sihvsmitted 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 A3ajr um bn-bw64* soq9 of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissio4 uw ns*a6qr3o9bm-j bn 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 ehp (hptex.m9+wb15b V. The voltage is usually stepped up to 450m91 p 5+bhp whxete.(b0 V by a transformer 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 5fbo(wcg ltb1e yk 93+km long has a total resistance of 0.60 W. A generator produces 100 V at 70b 1be35tk(yc+ logwf9 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 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 d4 m *dxc*s+fhp+1svy50 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 trahpdm+**fy v1x +4sdc snsformer 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 less p 2crryxr;w5e6s a2bg (b5a(l:7irb pvower would be lost if the power were transm6wr 5( ;:csbarrr xi(bb e2 lp2ag75vyitted 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 generatorh njrdw.892 ir is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To n8 rr9 d2jh.iwwhat 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;p5zbz1 8i+b/,- b3/wmsfg q obwsvwc.0 A. How much energy is stored in the coil's magn85q1b wg3vwz //cb;-zs wbio+s, m bfpetic 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 a n+b9ktnm3kx;n 18-H inductor. What is this circuit's time cons ;k93x+btnnkmtant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmy3+csl6ma04ne 4hxz hf,c g 7es 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 ou*6xqmy9f 2o+ o5) pw dpgtzz7qtlet. 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 t cv)ap,jr bspg8o)if;t/ ad0v:r/w5c he resistance of the lamo/r;a:t)gswa b8ic)rfj d0, ppvcv /5p?

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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 connectet:3 gie* kmijk39vc0vd to a 120-V ac power supply. What is the peak curreni09: mec*kivtkgv3j 3t 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. What is2h,dbtte5 c 1 yzgix/9 the power dissipated in the re/ t5dh91tb,e igzxc2 ysistor?

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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 a8 /bmcb+ux+ x50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res i nniow9uj: 3p0 +ur3smj14vjistor 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 rvl4*wa9z rin7pul 5u(+(l uslesistor 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-kllz vtqo57 r9t g-eads07k)7mH 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 inductivec k6g9;b qr*b0rizv: d reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will ow/tg; b:m r4aa 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 Hwfpsv4vp5 x*.z?

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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 wh ipw-r .;, ab9ch t4)saj6hwif1yx1dben 120 V AC at a frequency of 20 kHz is applied to ifii1hx1t a)4 h a96p-;w, c bsjdby.rwt?

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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 dufd3hx d1*+ vbje 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 reac o10ae*0unqde tance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHzegxw+fm 5s/+ z?

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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 reactmllsk2 gmz z); oc1ozi15y( exjt,;q 1ance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.01 dp0p+5spl2 jsdwm.g v0vz cs1,u/w ,x0-mF capacitor be 100 W?x uwd. z5wl sjpcpvp/,+m0,s1 d2s 0vg

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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 capaciqzqp 4;sa;ml 9gzy w0ah3 b)d9tor 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 ofy 6honlo(da8d nwn-mq )5g-sxgrf- 1/ an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W- dwl(q-h1)5 ado8s/nn ngx fgoy 6m-r 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 1.0-5kb1 dhex74ni0y( q l-wc6wmaqda 8n 1mF capacitor are connec(1e nm4al8xiwqn0cdq6hk wb ya-1 75dted 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 resistor, 20-mH0:av r*(oxjv 4z p)ja io70rzq coil, and 1.0-mF c a 0 vo7x*qjzva4o0z)rri:p(japacitor 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 sanc 2t. o6k7dmeries with a 20-mH inductor, what is the impedance76mca .td2k no at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seti 9 ;xez9t+61mdx4ywtc55u0gmf: i zwje *lsries with a 20-mH inductor, what is the phase angle ag6 m5 9fiy9 e:+sw0uxt;dlz imezw1 x4t*jc5 tt 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/nv d q xb+.tmv9fti0c v/2ei5 and 1.0-mF capacitor for a total impecfv+d5ivi/tq n2/vm.xe b9 0t dance 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 inqif)a : k5zo zk26v7zb series with a 100-W resistor and 15-mH ov qzza fik7:2) z6kb5coil to get a total 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 d8s0b -s/ cqlgHz for a total impedance of 400/d-8bssgl0c q00 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.t8x9dw e f8a0o0-MHz for a total impedance of 15tea0 8xo9f8wd 0 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 a 20-mq az2dqw45 .mtF capacitor. What is the impedad5azm 42. qwtqnce 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-fcjbi9 dq+(z 9 k1 +jmp,wa3kwj(s k3amF capacitor at 1.0 kHz for a total imped+kk9q ,p sjfdzm9(w3+w3(ba ka1ijcj ance 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 ulwssxbkiklq3(t,8*4q mhb6* axa.y ha 5; f,10-mF capacitor at 1.0 kHz for a phase angle olx,ylq6w 4 ;u xaabbs hq8.*i(shk5mt ,f*k3 af $40^{\circ}$?

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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 q0 +dwr)aab9x3 /2:zz gmzrk b-ipqr 7kHz for a total ipb dawq3)0rz2q kz g:r9/z- mbr7+ixampedance 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 qmp/1eq:twujt b :6a12bdy,iseries with a 100-mF capacitor at 120 Hz. What is the phase ang1t6i a m /b 1q::,dbu2pqjwtyele?

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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 resi8hr8obop ed 87md.(ks stor, 20-mH coil, and 1.0-mF ( b8hpodes8krom7 d.8 capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, ao(q+vy 8)stv a 10.0-mF capacitor, and a 0.350-H v)+8a sq(t voyinductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactd 7yn6 0:rgsrn fxtp gtl1;+f;ance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit? s ;r06dt7lrtg +nnyfx; p1:gf

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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 containingslu :x7 k0fthkv(x8k- a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup (-kt:0xlhu ks7x k8vfply?

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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 i1 y2c5io *ox8o(hgj, r bv7ldtn series with a 500-W resistor for a phase angle ofc1bo (*2gy drl85hoj7ot v,xi $40^{\circ}$ 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 h7x4 7k ktxy4scl1a.v = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power 7h1t4yv7c x.kasxkl 4 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 16xcbt f, ja1qqs.0+c5snfas 62.0 W resistance, 15.0 W ind1. 66f+cxsb50 na,jta fqss cquctive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of anx:0bk+ ko wbim7e e17a AC 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 impeh;(s nq7oub6 ) (hz4iu*tw figdance of 60 W and a resistance of 30 W. What is thes zh 7i qut;fub4g6niw( o(*h) power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for yb2wxu,a ozn8f pmsv: 6+ /9qta series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ,ftuw8+xq/zyvm a pn:9b62so 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 coi rnot a s;so+prll*6*sbzk4. 97f+gngl in series?7**r osbr9ksglsnl.ag+t p ;nz +f6 o4

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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 wih kg54rug (y rd*zwjq8mj: (e3th a 4.7-mF capacitor for a resonant frequency of 10 :4gd5(hrq 3ju8 ge (w*kjyrmz kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a res).:eh ,zwk( ll5t7;bc nkyo nbonant frequency of byk k7;zll ot:, (wbn e.cn5)h1000 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 resisto8 2 l)jekt2egyr and a 40-mH coil if the resonant frequency of the kj8e)2lgt2e y circuit is to be 1000 Hz?

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