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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://mail.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://mail.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 magn ;-hcsqwuxz1 l8o2cp5etic 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 induhy 1 e,-zl .ltkush7 pghc(qi655rx,dction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a co upeylytf7+bwh2 5wh*z. 92sc il produces what kind of change on the induced by wzfcys92ewp.5 u27+h*lth $emf$, 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 wire producc 8.s v b i42h(kf z(m+lf3r/n(1j zhty:htuores what kind oo sk+b3.8(r/1ni:zzytc(frt fh( hmj4v 2u lhf 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 kini+ov ta:4im1:zfzq6 dd of change on the induced:m fzaz6+id 4tqo 1i:v $emf$, 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 magnet,n-max/u) h isgor4*sic 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 c-1m30 v5w/no(i we ;wy)xntv4kvojvsurrent in a conductor will be that which tends to producn-oe v y (;1wiv )w4oxw3/5smntjkvv0e 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 t.7vi+a8 51 0t:azwk l ukzbagflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when 8 tzg1l7kabwv:+aa0k i5 t.uzviewed 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 ayyu1*s89g58qlu ldu r bove its center with its north pole pointing down, and released. As it approaches the coil, the fallgr9 d5u ull1*q8u sy8ying 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 vecto*-h z(g8cp /, g(til yvhxyx/er points straight up. The magnetic field vanishes sud8zx(( i/,yph yc-v xtglhe/*g denly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fi0p;dtr6xci v c )g4/nthjt/c3eld vector points straight up. The mag6nc/ h 0dxjt4 i ;cpv)tgt/c3rnetic 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 w*c kjpy+ow0 :khere 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 field disappear :+ k*jyop0wcks?

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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 horizonu:ys9f2 cha0w tal table and carries an ever-increasing current9fay:hw02s u c 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. 7iml*o a, nhza *w +7awaw3-kcwz 72el As the north pole enters the wire, the induced curwal-coi waehznamz,w377 *w2kl * +7 arent 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 ro uqfenl1-z -xebj*;+i33 ucqf tw5b6ltated at constant angular speed about an axis whose direction can be varied. In a region whee3xb+euw;5tlf63nfczq-1- u* jiqb lre 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 constdb.ali ) q0hiaqy90mh3vdu+ ) ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's ax y.hubal0qi dd03a9v)m)+h qiis 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.mv/c :s9 jt2gf
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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 a8xsl(js (s9 jc qp7.pm2vbx 6dn $emf$ 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. Thex9i aeo +yf5gnl 0z(5y $emf$ 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 direction) is move9fb4paef*oxwp *q.a j-wifj q8 n*n*4d northward at constant velocifa nx98a* we*ff4 b-oqwjiqnpjp 4.**ty through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at 5v6ugz+i2g+5c 1w qvgiu+ lcka constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator t -r+w- 2v5fn8) sew:fgqzlnerransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatee *+timxrz,,khp hmy,w 3n)d1 ,q ar,es through 60 revolutions each second. The frequency of th er,,qye,kptah*n+mrz,, dhw3 xm)i 1e $emf$ 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 use(1 b t+qez4bv0g+phk l;sls:gd 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 1:v /somqwfi-k)j7nq

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prim1ob v w1v 0kub58m/tpb esd/sd1)pb brt(2f4cary coil then it dbscp 1b re 8o/ f)/ub2b115vkd 4p(w0bsmt tvis 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 contain4f;hn; zxmcj 4s more loops than the secondary coil then;mcnjhf44 z;x 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 pows4+k ,; g1lcagmwy ,2i:ewucier 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 circuia :m ql0t*iaie+v9b0 zt,

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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 ba ji 5+5t2aeiaeidgnqkf mk0((/3 4g wottery of constant terminal voltage. At the moai 42k5w(eg j3 0o5ea(in t+fm ikd/gqment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected insv,9d8ci eet mjsi ;2hgyb1 13 series to an ideal battery of constant terminal voltage. At the moment contact is made witht32s1cdmsii9v eyjhbeg 1, 8 ; the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is m r3p,d pm3o)(5m vfsfconnected 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 rc+ zikyuu,lp 0fp hvkrs2s805 5-+perlwh1n 5esistance 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 e 5nm39e*dp gf7dbw(5viohm2 a battery. The time constmwfgb eed n7iodv(553* hmp9 2ant for the circuit 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 are connected in series to zy oy+s13 uxu9yo(d*va battery. The battery is suddenly removed from the circuit93v+uusz xdo1*o y(yy . The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following h7+9icfkev ui*i zj0-2w :kgi1vbus 3 jave the 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,7w.f e uufshdbymg+aq2awyf 38m,393lst +4b the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cu q9j(aajehp+8 nql.bs w7 sy59rrent eba. j9 aqs+hn5l87pj 9qwsy(

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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 whkb 0d g2ckzg,9at factor when the frequency 0kd2z, kgc9bgis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is douqf0u-f g65pizjvs4lebqk*fm8f::) a bled, the inductive reac85asife bujfpf 6m0q: 4gk )-fqz*l:vtance 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 ac8d(;)nr; cdnjzwaf .kross an inductor approaches zero, the inductiv;fd. k ndj);wza( nrc8e reactance 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 suppqc,b p++t 4olqly. In this circuit, the curren, bqt+p 4o+clqt

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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 factor whenq,auk h 1 .1xfhtrc0t4 the frequet04uh haxq.c1,1rt kf ncy 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 capacitor approaches zero, the capz5.h6w arpb c9acitive reactance of that capacito9 cz.56rawhpbr

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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 capac.:7 ) meixmmyn3e+hyj itor in a RLC series circuy:y m)x m ijeem3h7+.nit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as k-t9w n55t/t/6xf)brkq qgf l$\cos M = R/Z$, 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 cir dx ex(-wmr)1vcuit increases if R increases. When is this statemenrv x)dm1wx (-et 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 impedancl0 c(ko/ -b: p)2pgg;ap kjfxqe 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 increases im+ x bd/;r;obff $X_C$ 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 cir5xutz xl8j27hc l-n +qcuit, the resonant frequency of that c7ncx85lt+xquz l2j -hircuit 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.*/qa-0f 1dkwkvvwr*krqj* -4n jbsi q,wt+u onance,

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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 occurs6jgdf,/vxm+wj2:a z s 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 rad)e(dq j* qd xnm,kvic.*32ji s/ x9citius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop *.s(qvccnxdm*3ieiqt )x,j /dk29ij 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 radius 0.10 m is rotating in a uniform magnp -06n 9lftf6w*b (.gn hchifvetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thnfhfv w (-t* h fbc.glpi696n0e 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 field of 0.20* h.q8hlw6,eq0o r aky T. Fi0*qqr.oy6h8h eakl , wnd the magnetic flux through the loop 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 ar rpdn iooxi y(9w :-4po94xr/l5wm7piea of an adjustable single 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 coil changes frou kk.1+o b*dbym)y2tu m $4.0 \times 10^{-5} \; Wb$ 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 18 cm.0d+qlcnu5;h , 3yw:xmuf(br ztdh4 xyud0 r63 A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fdy xl,r 3xm6d h(fy5;0u4 t buqh +0rndc:zwu3rom 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 aryb9(l3*k svtl ea 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 aanfp1 8vf3,z 1 tfauaev ;-5j7a+yk avrea $0.20 \; m^{2}$ 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 horwrai3n n 94if.izontally at a location where the downward component of t. f49 iirn3wnahe 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 mzgc fvnen* t.e4 hp h33kh,/)a long rotates at a constant angular velocity of 2.0 rad/s about a vertical aavh n)p/efc4kn3,gh* 3 ezh. txis 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 has 50 loopsbe;bsk 04lvq. 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 100 tu(i: k q2q d33yvpqprf/rns 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+hrgrh e.ozx75uj:o n(+qx 7 j armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If5(rej:hnq g7x jxz++oouh7r . 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 x+oc98efhp0rw2 *.g 6z- kvm yhnq 9cg100 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 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 gener+4 eaako4i hq8ator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is8 i+ea 44ahoqk 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 generatk+-ot(phd havo n9/ )por 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 resvutq *+3xnu 53,kr+tvs:yiu kistance 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 resisj1*te zoun/fe5l a.6ktance of 6.00 W. The motor operates on 120 V AC, and when running at full sl5e6ktnoj 1f/z eu.*apeed 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 resis rh8ue7h9/ e4tzm. ejitance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uhr9eejt7u 4ze/ 8im.hp current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 ltai wd*d3 av2x mnrb77eb(/;W is connected to a 24-V power supply. The operating current is 1.0 A at full n 7ml(da x/e;itb2vda7r w* b3speed. 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 qc;z:w -5;go xy 7jlkkto a 24-V power supply. The operating current is 1.0 A at full speed. What is the bako zk5; q:g7jcwx; ly-ck $emf$ 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 neee;ylx1 7sasx dpo5 z+4 ;c1lrtt5ss)rded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn q5htc1w+a4mmdt + j hpsv4b(, primary of a transformer causes 14 A to flow in the secondary. How many turns athtapvm +4d bscw,(5qm+1jh4re 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 78bpih6ay q-r a 110-V primary if the 24-V sec a-i 8qhrbpy67ondary 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 dru:bd yp0 i8q9jh9k 7a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the0d:y 7pib 89rqkd9uhj 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 prlc vehs/ (kc,*n+vof*o0z(m zimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can ozv /ez0*(omlk*fcv+hc n,(sflow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer providexxc7k-: -xz aes 7500 V at 10.0 mA. The primary kea7 z:x--cx xcoil 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 +vq)(eq .bn5fpcb0sjhas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pr 5q.vb )qfn(sj0bpec+ esent 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)q9e5iwp de5 n 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 present in the seconepd wq)5 en95idary?

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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 d3p:kniv*3no)c 9aj i/ oo kv62vz; zwsecondary has 200 turns. If the i2)cvi p9a:*vn3d/ozvo3k wkn jzo;6i nput current 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 secondarykui s,r ib6w++ has 200 turns. If the input voltage to the primary is 100 V, we can expect t,i6 +uw +ribskhe 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 turns s3mh )9c xeo.3 ohs/xpand its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the sech mx.xpo9/o s)c3 h3esondary 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. 8,6n bp1 x ;yd*jmkxbb The voltage is usually stepped up to 4500 V by ab* yxdnj 6m8pbb;x1,k transformer and transmitted 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 of current at 120 V. The voltage is usuall h57uv4-nnv9wu sna8xy stepped up to 4500 V by a tranv 759vnh n8xwa us4n-usformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Th6)o/ -h6kkaxx tpk+um e voltage is usually stepped up to 4500 V by a transformer and transmitted through a pa x6 k6u h/+x-ktp)mokower 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 km long has a total resistance of 0.60 W. lqmxzcj )/ijwk. 9:e9h 7d2mqA generator produces 100 V at 70 A. In order to reduce energy loss due to heating of kmj.h 9zl/mx 2w dj)c iq97e:qthe 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 kml6hua* 4 ofaf* 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 iaa*uf6hof *l 4s stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How muca :.ombq z; 0kl(wy:geq-nd efefh: 57h less power would be lost if the power were transm ;ygmelq0w-7qkan5 b: f.( od:: hezefitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. (ji;pk 92 ystp It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exce9 jsip2(typ;k ed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muclm)s)v w)h2a-v+ i (bsxerz 2ah energy is stored in the coil's magnetl-h))er x2 siv+mawz2 b(v) saic 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*k*l 2czlsaz 0n 18-H inductor. What is this circuit's time constanz0zcl sk a*2*lt?

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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 circui9)ty fqtys:2 vt 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 outlet. What is the peak cu i.n(ta:w ya;imi m+i(rrent?

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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 ACas ekgn-9 w8bt4 m7 g3rr3*acq outlet. What is the resistance of the lampt kc98w r-4beg3sga3ma* r nq7?

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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 12xq +,azi3ic:(*d sznp0-V ac power supply. What is the peak current throughqd api( xsnz:i+ z,c*3 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 tyymz,( aut 9 )rbte3,2j s0jgro a 120-V ac power supply. What is the power dissipated in the resistorsrtr yj0u ejb,) g3 9mat,y(z2?

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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 resistog7hq;gz r l kmk gbmr*6,g;moq 1/,/csr 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 9h2m(8m;b2mbm9athurkeuq 6d kh)s+ resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W repbmq 4lz. k32dsistor 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. j0 2-fmp5mnxtx 66lsu0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mHt3yt n4 jtl7e,jtlpibb 1)9o 2 coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancew( vp f/,3.coafk;uzq2/ ndi c?

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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 reac/7xnte7o0xvf buf *l l 0*swm8tance 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 tk.z/w1ys 3g*ad, av mfy4kk8 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is4v/* msgk 83aaf.1k,dy yz kwt applied 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 2.57smqzrz/h( w ,0-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 reactance of a 4.7-mFu /m* 38ismhzw 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 df98h; w cb q /pn2e0h)poc9sfat 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 mz 1ts*tp) xw: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 will the capacitive reactanid .r 831lvnkxce of a 0.010-mF capacitor be 100 W?. 1idr3nlkv 8x

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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 capacitors 4ceg op+tzq -g-enm:r;1-p0n vvf7u 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 wadwk 4et4+p/d m*4d ean ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti 4 wp d4*/wma4dedet+kve 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 resistip ( /u4jh ice hjh7: :ppm.1tl+b+jdior, 20-mH coil, and 1.0-mF capacitor are conneh1(:e+pjdci4 : / +pui.hhmb jj7ltipcted 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 ig d85(: ggk6mf xi8uo( hgt:eof a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecdfgu (x 8g6gmgokth(: 5ie8:oted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is b8afpltb *1d9the impedance at 100* f1b89a dtblp0 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 qz7. t(awi2hs r-k3ss with a 20-mH inductor, what is the phase a.i2rhsa- k37 (tqsz swngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH xqs p jr; 61b7,lzrh5ucoil and 1.0-mF capacitor fos;ru zrxj7qbh, p 65l1r 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 capac;niac /pln 69uitances is needed in series with a 100-W resistor and 15-mH coil to get a tot/a6c n9nl;puial 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 H, rh-xdr/f qqv k7ua-;z for a total imped-qvuka xrfd, ; -7qh/rance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wwyj7iq / efeq5nw6e/9ith a 100-kW resistor at 1.0-MHz for a total impedance fn5e/97 jw /eewyqq6i 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 with a 20-mj,ij y8;qehe2/*et kwp 73f xvF capacitor. What is the impedance at ,/; theyje*e7kjqwf v x28pi3 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 i i9a*lf1gx9j at 1.0 kHz for a total impedance of 99xiaf g1il*j45 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 u2 t.rp59beex series with a 10-mF capacitor at 1.0 kHz for a phase angle xuee5 .b2p rt9of $40^{\circ}$?

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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 kHz for a totalw k**q9-r sdvz impedance of 45r-dz*9*wv qk s 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 10c f45mt it*kp+0-mF capacitor at 120 Hz. What is the phase anc4p5t+m fk* tigle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows atx)hnh:n9+i0 :tsi pjt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectexpti0h ):hn9+i st:njd 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 ot vbj /1a*wy vywzk06z,.q.rlf a 100-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 the rmsbj6wz.yq v, /l .v1 *a0zywtkr current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductoripka5t9 39d ih of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current tpi9 5ak9d3ih 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 contal / 2 pv7k3iki-h4 nohs3x,dhdining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power3 kp/3hlkd7x nvso2i-hi,4h d supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resisgeq4p kph,)i:fzn,6 stor for a phase angle of ),s:pnk hi4 gfp6,qze$40^{\circ}$ 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 freqc5 /o5g, q etcq: :2z7tpo*6uzjwb lmcuency should the circuit be driven in order to have ma, jeq/w5:tz6c c5 oqlpto z2cg:m*7ubximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output i+1y1rfo kjffc:,js:4 k aqu: bn an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive s:1+ j4krbfc uy:f,1qkjfa : oreactance, 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 Ax3 m3yk p6h314k)od/tn ihbrkC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wk0nwo-)4 bvfo rbz3aff(;;e upx1.rjhat is the pow px0) na;.ffe; o(f1bw4 b-jor r3vkzuer 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 conta(jsl,;d ski wv;8:w doining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 dv; ,kwi8j:sdlo;(ws0-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 seriecfgkyro p57/hp9z(c)5 jv + djs?rjv zyoj) dkh/p( 5p+95gfcc7

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for ah k0 2ikac3, byqte:3u resonant frequency of 10 te0k 3 2acq3k,:b iuhykHz?

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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 resog0q* sg3o)j fuxcim ,-nant frequency of 1000 Hzju3gcfsio x-,qg)0 m* ?

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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 i0stdi,( bu2kcn j f81in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circui (j,fbiti dsnk0 u28c1t is to be 1000 Hz?

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