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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of vs qhkw +3bk+;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 thafcvaft6e:v xxg2bgys5s d - .( o)wi*(t 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 prxw6u u yy*qk* bh84ed+-c+bif d v/f1poduces what kind of change on the indu +k4qh*6 i e-8yxuu1c+vb /dp*yd fwfbced $emf$, 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 3sa7w; 5aw1lw w.a8 0fsrz dpqof the magnetic field through a loop of wire produces what kind of cha .7s0 pw w3lf18zadqwwsra5a; nge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thothu+48.q kg+qcjtm8 9:fvzy e induj. + +fvtq8:8m qoh9c ugz4tykced $emf$, 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;f sqbij5 e;k, a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direc :p-pb;farzgf p v0d76tion of an induced current in a conductor will be that which te07:vr;g ap bdfp-6z pfnds 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 hobibn l ma0,q-hj ;y+v7rizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abov,7l; iybnjqm+h -b0a ve)

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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 hvxfs3+onw6a1:lutn kx*4nc2eld above its center witufnxna 4lov:3*n 1x2+st w6kch 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 9vt1d ff-k5e:s)hu c7 uplbu 2where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sens5b:ffsu kv)u7c -19 pled h2ute 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 magneto9 tc pf t.l9ecu7/by7ic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is t979l t/cc.u b7fyepothe 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 hnxyy+j z7+n)where the magnetic field points straight down. The magnetic fyxjn + )7+zhynield disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lgfakc7a25q5t uprh3.yq+ )v eies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, on tqeu.5 gk2rqf+p)aach3y5v 7e 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 enteringj /iz3m6+ +w;unjyfgr b6w(q s first. As the north pole enters the wire, the induced current will be (as viewed rj ufgy +j6znm3 b+/s;i6wq( wfrom 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 anr9-omp*ce r(ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be mrer o*(pcn9 -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 conuyew ;iylp3 ow;u,:i/stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh i;wl ,uyoui e/3w;yp:at 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.pcz u3n(zry2j3j-;l k ( k k+noc+zww)
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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 aor rs0 g(dh9w xs4o(g(n $emf$ 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 .y o7cm 3n iaq ,oleva0qbcw ,y4b2+;sa magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwa0j2ny )kj(a d b)gua;/ os0crwrd at constant velocity anybu0wg ;d 0as2(orj)/ cj)kthrough 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 a constant ah1k rw190c1 kwl-n gdqngular 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 ,1ey(+qekmdnx1 bc,2fb+; c btfs pc3 transforms

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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 tl 7w9tx5n8xr3ksy1hvgk96 o*fn hac 0 hrough 60 revolutions each second. The frequency of thev90 harwo8y97 6l 1k5fn xtxg3kshc*n $emf$ 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 gt/hc8jijj8/d :6zinaz f,a+.l+lgk 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 de d+ ;7lroniy(dvice 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 than the primar g ,ga (h*p8anm6do6xjy coil then it is a djg xgp*m68( aa6nho,

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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 c vb k7q 5dj*wmw4 dv.s.(a7ln of2jv.roil contains more loops than the secondary coil then j .ndvwkwv q o.4.2 ld7mv7*5 fja(rbsit 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, th3bfl4y 2kqmne9b,w v0e power 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 khzc( rw.20 rkcircuit,

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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 o t+ 7+06ezzsipo*ns3boew 1gto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage t0z n7w+b oss3eg6p i1 z*o+eoacross 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 ideal battery of cons4nl7z7p/ xw--v zk0 q3oiarx xtant terminal vx-7aol4/7kz r3zxw- 0 inpxq voltage. At the 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 ow +os si2aog0rvv,195enuq ( inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R ivv,hjx+ 26c no paeg,:sip9s7s 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 connec8,z 1n)kgus jbu,keq nj;e:g.ted in series to a battery. The time constant for the circuit represeu un: n)egz k8jqg, ;e,jbsk.1nts 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 a battery. The battwnir6c ola86 vk a5*sfcm71o) ery is suddenly removed from the circuit. The time constant for of t8v6 o7cwm kri)nacs *l615ofahe 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 have the smh;xeu)r sh8o mzxnk41i3u 2.ame 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 p,eb)lcj5pbe(,kf w* r*be(v to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit,h 7nyp( 82 ct1euzkeby-ah m)7 the currenyep yk1( c-ntzeahumb827h) 7t

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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 fact0uobf rm3t7c1502ku ..t .zx hmkxutsor when the frequenc.3ru1c tmoh .m.u0u7tf bt5 xx2zs0kky is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC acu fip8w g8vp5z)12g voltage across an inductor is doubled, the inductive reactcu 51i) zv82p8gpwafg ance 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 acgjvx+ :u4 v0d;sb7os 6qrefg/ross an inductor approaches zero, the inductive reactance of that c+:0j ;b/d orxsv 7u q4gfs6vegoil

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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 c .6rw8:i i6c jt.svwo k3bbyd.ircuit, the curren.oit8r k.i wd63w: bcy.b6svjt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanchyjk hz4qf1: u10i)podalk 8 (e in an ac circuit changes by what factor when the frequency is tri 4ah zf0) kp(uh8 jkdoy1:iql1pled?

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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 o/ hvvp2 kl1-wvoltage across a capacitor approaches zero, the capacitive reactance of t how1pkl v-/2vhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a xgsbe h ;8+5eiRLC series circuie+g;sh5 ebi8x t?

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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 de2uel8dta /mx*a y roat:59n( :iz aj5cfined 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 impedan5.a5rjjeeikmuw 4j4u o.9n v1ce of the circuit increases if R increases. When is this we59iaj jr uokumj4.v4 15en.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 circuite bf 7r94gdaz2. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance7uz-r);2paf 9j8ydn a;i q78 gzjuojl 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+zdhw 6tx)s m+ both double in an LRC series circuit, the resonatm+z) wx+dh6s nt frequency 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 applied voltage. py/;v0 lt1detjy.ys kwb:6 p3At 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 cp.lr1 iaq-)s xjpl ,8rircuit 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 field of 0.20a;uyz dvz600r T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field 06d0;z vaur yzvector 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 radiwj3 b(jmk8 :odv4a*ftu sf-0fus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are oakj0m:vu3tff (8*- d bswj4fperpendicular.

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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.aeinx/-e8- s9ik 0k h ixckrto/t x): rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane so9xx0-/e:8 ht entii c/ )r.kxk-akiof 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 i; ol4nb-a 6dres 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*eha6z :c.pf .ydyr-a from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with s.i9 qsj kpbm*hn pt2s5 z)w,6oides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average qwh5n 2m s *6b.,9psip)z otkjvalue 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 ;zpd34f6q;vb: z4s k tcja.guwith 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 f; cm;lzo /9-a+1qkor,jx zojand 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 horizontal +8;mvwyuu3 t, rbk;rxly at a location where the downward component of the Earth's magnetic f 8u; rbr,+mkv;3u twyxield 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 bnj9:ay u4+a: )abt)fpe+ vhluq9 xc2 that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constyc)bphfxbq+l4: 2v n ua9t9u a: e)ja+ant 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-sectionhfp x(:fbzxr0 t d/.8yal 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 tue8bdezwxk8.9 nm 7it6fd w1-srns 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 pj61y la +xxg/w 0bx7ulsu*/iarmature. Each loop is 12 cm long and 8 cm wide. Theiu1gsll axy+w076 /bxj xu*/p armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 2n2xol jlfc:5bg1/ wb100 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 simpleymh pwo;2/oihoy :w,1 AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T,o2y:ywi1o mwh h;po/ 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 wirx ))0ubipnpy5oh* a kk8d4a2o 9t7te th 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 ha(cm7i,wq,z d1lc xk7tve 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 6.007s ava0xej(zdf6 ; wx( W. The motor operates on 120 V AC, and when ru 0eazxwjx( fsva(7;6dnning 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 resistan5eng8y8 1no) t-o z;czjcf-yece 6.0 W is connected to a 24-V power supply. The opere)zc1z-o 5y8n;tcenfg jo 8-y ating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 67oqp6 oa 8mkgs nt9g8r4l fx;-.0 W is connected to a 24-V power supply. The ope tg8g npof9a4s8;7 r6oqlxk-mrating current 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 connectedg8v.p*e0 4bb lhapki: to a 24-V power supply. The operating current is 1.0 A at40*.kabp ie8 v:lghbp 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 ir wowns90b 11of $120 \; V$ 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 pr,pax2a3,r 4 hgca9/3nejoy k wimary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondarnkcyho34j gwa, ape,/ 3ra29xy?

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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 z5g*v6u) liugsecondary has 100 turlgvgu 5iz u)6*ns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and f, 2w )y 61vubk)e/v .yzovoyopa6s)qa 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primar)oa bsvwep)q o o) zvy.fu62v,6yy1/ky?

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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. pe +17slhd z))sx ykm)i:nf; fAssuming 100% efficiency, how many amps a) hk:xmesds7n;)1+y)f lpfi zt 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 transformer provides 7500 V at 10.0 mA. Thq*lpwpz1c y,p9,d*d te primary coil op *9ptdd,ylp 1,qwc z*perates 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 turn. w;mvym kz6-n+6/mgws2jk 8 yg xwfp;s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thw;6nkmmwzyg v6.g - xws82pyf;j m/k +e 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 turnsn5xf-75a8 2uqv rdyf)zkz2qh4n g x4w 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 secof2naq2 rqxdzhx- g 4fv84w 7y 5)zknu5ndary?

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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 turhbnw9 1gfx0fc ua4 .c;ns. If the input current at the primary is wca 1cuf hb9;04n.gfx 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 seconda c1s4)na1alodry has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondal )aa 1dnso4c1ry 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 tv6 ayzxacy5,* auj2 :aurns and its secondary has 200 turns. If the power input to the primary is 100 *c aju:2x,a56avyzy aW, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currlza 9cg /j2flrdc4v,:ent at 120 V. The voltage is usually stepped u92cv df 4 aj/rlzg,lc:p 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 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 voltagiaku)q:c 1q;a e is usually stepped up to 4500 V by a transq)1iak qu;c a:former 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 *2 gmqr7nuqi+current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total 7 m+rg q*nqi2uresistance 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 okmzm )t( l6kqr(0w:k hf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission lk kl)hkw( 6tmqr0z: m(ine, 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 km0,vflfz9t dqdx8 h(v5 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 5zq ,tdv8( hd vfxf0l9a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much legy8nhste8pzg,)n/8te*3jt y p c0 ul-ss power would be lost if the powertu)nzt 88,j y-t/eysepg3ngp* c 8h 0l were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line 8c wovk kg- z5ajy.b4;with resistance of 0.60 W. To what voltage must the generatoryzb c wgkvj.45-oka;8 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 carrie o6mg9a;+la3wljowugmcq /f8p 74h0h s a current of 5.0 A. How much energy is stored in the coil's magnetic fch/6ghm p; oaa7w gjo4qu9fl mw30l+8ield?

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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.e 7wgmo8-y-x3x+ sdw h0-W resistor and an 18-H inductor. What is this circuiw wxox- -ey7h8dm+sg3t's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where thehnb 2sjmzud8/a *9)j h 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. Wha,1/fyv r, )jr.3 z tp0 /xupgnljok-ost 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 12bub90upr * -wc0-V AC outlet. What is the resistance of the lap* bw9bu -cru0mp?

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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 ty-ez.h8xmq p* cv7fcyq z;f a:4 i-jj5o a 120-V ac power supply. What is the peak current through the resihyq: q* jyxzpccz-.m4vf-e75; jifa8 stor?

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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 is the power diss5e)1q1g+fq 1mnps go uipated in the resi pq+squo5)11nf mgge1 stor?

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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 resistobcn 386ci unk4r 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 resistk0v4j xpghc1a2z ijhvs)-a ;9or 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 resistorn.e vbwd4x n6mc r/f67 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 osu/k0)z64;4f +zl fpwcxxf lff a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mHbem)ph1d ;2ry 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 0bk;) kda 6xkbbw/gusnfo/82inductive 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 d7 mubiji 5ie3s9k q32of 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 120 V AC at a frequency of 20 aprwljv7: z*0c 5q d);byv;fakHz is w;y :7v;5bf* zrlpj0cvad)a q 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 2.50-mH coil zg +keg7ojoakpo8r+ g- h biq7 )z3la)):n xb0due 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-mF+-x14qfip r wv 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 or 1tmyepl(p;/pp z80h o8 epd0f 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 poo asim6h:df, 6qj1 yb3u .-b/mh7jr a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a awql -iuw8h();hhnhl2 if8u7 0.010-mF capacitor be 100 Wui 28a(hhw) f;-l8h huqlwn7i ?

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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(,t flwq):e bq a 0.0010-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 12.0 W va*6itu /q lonp y)7ng5c82jpg(kn8 fa yp ,k2resistance, 15.0 W inductive rei5 p o6g8cn,(q*2glafytv )aj7p8k2yu/nnp kactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor,s(awy; y:gy.7we .n,eqsfo 6q 20-mH coil, and 1.0-mF capacitor are qe syao;:6f wge n.w7q(s.y, yconnected 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, 20ca 1yqnxx4fbl1 19 ;ff-mH coil, and 1.0-mF capacitor arfc9bf an lfq1x 1;1y4xe connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what o00d oe2ocvrb qtw)35is the impev)d oc5 03to2w0r ebqodance 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 series with a 20-mH inductor, whatkc*s/ 1n2xn,pri 2 zqx is the phase angl2cqs nzkxp2i,x 1*n/ re 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 cir7 rtqt)4k3pg)6 sykq rqn7ta( cuit with a 20-mH coil and 1.0-mF capacitor for a total impn36tgakst(7r)p yq 4 r 7t)qkqedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serie 9n8v i1c6dvqls with a 100-W resistor and 15-mH coil to get a total impedance of 110 W ai v8v6dnlq 91ct 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 i+ ;ft1glt/5x.zvc*sh-qo u o be put in series with a 450-mH inductor at 5000 Hz for a total impedanu+i.ts 1tx -;vfo/cl*gzo h5q ce 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 with a 100-kW resistor at 1. )m fcsurfo5cz*v(o)7yl5 s8h 0-MHz for a totaluff 8omc ls*)rys ()zhco5 5v7 impedance 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-mF capacitor. What is the9dj+d vt,xn +u impedance at 10,xdd vu++9 jtn00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz4w b-:fklwxo0 sg iw3q1a1 /qs for a total impedance o :sq 1q wsb -1aolfk0/g43ixwwf 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 aubae/zw3 tkk .c,/o710-mF capacitor at 1.0 kHz for a phase angle of a/.cwk 3z, ok7a/tube$40^{\circ}$?

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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 resistornh a e 440:*hvkvjd3wl at 1.0 kHz for a total impeda v4kelw:n0 h3*j4ah vdnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series wit-.xpct;0xmfhm9:m m nh a 100-mF capacitor at 120 Hz. What is the phas0 tx;mmx mp.f-m9n:hce angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a.ja rzn si9nwfqex(g2. j*1:q 100-W resistor, 20-mH coil, and 1.0-mF capacitorej*.g nsn2r.:f qz9wqi1a(xj 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, a 10.0-mF capacito7y w02jajy3wg9bws4fgo. z 0m r, and a 0.350-H inductor. Theoygwgw bfm0j79s30 . j4az2 wy 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 reactance 30 W, and mcq::p*o+qs ol7aq,, d mdv;q an inductor of inductive reactance 30d+7m ,a:vp qc*q:;mqsoqod l, 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 resispdz 9wor1u+0wlu w5 d,tor, a 10-mF capacitor, and a odd01u5r,l zpu9www+ 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W r 9 2 t89lhbddpkhnemy* 5z3d:vesistor for a phase angle ofn8l5:dv z3dehbh2mpyk * td99 $40^{\circ}$ 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 frequeb+ z,cw-9 t 1xcwvk81ew:kazyv hb(/zncy should the1eb/zzcvkb 9z:1kww -vw 8h,+ y(caxt circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W res(yt6d9k 2i hkpistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cirk6thk p 9di(2ycuit 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 cir+*li,qly ysf;v lt*f 5cuit 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 7 ma vt0v2.t7wn:audum9d;v dresistance of 30 W. What is th at9avtv70wmduu.7vn;: d2 dme 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 a series RLC circuit containing1z; 4st8orngo a 50-W resistor, a 10-mF capacitor, an;g4ro18zs ontd 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 seo4h0fpfo4*5v:zdk1 pdb : ahw ries?wh kpoobd:pa14hf 5*4f d v:0z

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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 capacito, u) fb7ft5w;ekllag p*a qoht)a37g:r for a resonant frequency of 1g)tlkp fg tob7:3 ualqh w*a5ef;a7),0 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 se4tvl) qk;/en3 pob: karies with a 3.7-mH inductor for a resonant frequenvlot)pak4/b k:e3n; qcy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mctbmdzp f6tb9a1oghj* 4vw1p;-z +2g H coil if the resonant frequency of the circuit is to be z2 d*w+gvb;oftpp-1 ma gz1cj4h bt961000 Hz?

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