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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 unx jbvgj 5 4p c8j;f2dk 9n8v0u8bd1wkcits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stti+ nw:-dagffg )qi l7n1,c*yates 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 looyyj h p/k+a6,gps of wire in a coil produces what kind of change on thhjyg ka 6,y+/pe induced $emf$, 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 prodz51in*ag pb5don5(1be i s.cduces what kind of change on the induce5dsie (opn5 nz1ibbgd*ca.15 d $emf$, 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 wir6)zh jx oais66e produces what kind of change on the induh6 z6xoj)ais 6ced $emf$, 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 fielf9.p5jt cygj.o: syk) e*3v lkd 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 zu:rur halfr tvt .3:*.md4 ,zin a conductor will be that which teh ,4m: r lrutd*u..3vz:rtfaznds 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 horizontal tabmt)*te*jin ,8( le( (ztz zydka-nf2tle. A bar magnet is held above its center with its north pole pointing down. The statt-tn yzf, kz2*ta(le*)(( dze8jn imt ionary 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 flxw0-(lkd)o ep t hzvo;+38yf jat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the-o;fdx h0lpzjy+(k t) wo 3v8e 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 s5ipov(/- aokvn3hv w+ ; w3lrvector points straight up. The magnetic field vanishes suddenly. -oi v3+a h(3now;vsr5k/wlp vWhen 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 magneticqa,-bq:c1zv i field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abovei 1c- q,qzbv:a, 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 horizontalatjxviaa jw:k7e (w36 f3:zj: e-xtz0 table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inj:kjezwvat e:wa- xa 3(f :37t0 jizx6duced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tabrd r(dzmw.: o/le and carries an ever-increasing curre / (zord.drmw:nt 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 throug u.wk, ;:tqrgcf 1n6lvh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (arlvng6 ,;:w. ftuc1kq s 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 rotateo h-4k zweqn e/y4q *fk9b+*lm,/evxkd at constant angular speed about an axis whose direction x /y94bk l knmk-eof*,+/qhqv*ee 4zw can 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 constant angular speed about a06uq u5 nor.,otpos-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 ps.5 6ru oa,o o-q0ntuloop'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.h, w7y8gff/ vi
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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 an yhm:b3) amc( t$emf$ 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. Thgik3wwn) tru2*ly ,k8e/za s+ e $emf$ 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-*z z1wi7v sxakren ;):west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make ax;:zi)new k*ar1 7vzs 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 barct8v8em: y7xi rotates at a 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*w s b-d 0v5.fj(yrlcd 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 through 60 revolutio ka6u*4q;yr4cv(hl h kns each second. The frequency of t(4q* vhu4lar c ;y6hkkhe $emf$ 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 devicb*z 8/xy): .lcmzf0v 4d uyunje 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 device 07pm a57a;y q,rjml jwthat

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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 primary copt iio f0u,d0 x-n;v(dswrjqf(, 6.agil then it is ar qt0a, d-.d0f ( pi; fgwx6i,jsnuov(

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more /m qm43 wn-3ymti 8qxnloops than the secondary coil then it is83qm4twn/q 3yxmimn - 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 inputjro ,2s9ln c;*eg c9o2)aeqcz

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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 circu)zzasgz s991.n ucd6q it,

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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 batte0c k4c1jd1 youry of constant termina do 0uk1cj4yc1l voltage. At the moment 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 ins/pj+t 8g ffmw,(x5vs series to an ideal battery of constant terminal voltage. At the mo/w 5tsxg+jf8sf(,v mpment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecthfu:chtuc86 5. v+-6yxshckx ed 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 is connax:8c .9ped2kfv ct;u ected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battq1gb3zvs;wkum 39/z fery. The time constant for the circuit13g w mquf/v 9kb;3zsz 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 a battery. The b o:h kdc2t4-vnattery is suddenly removed from the circuit. The time constant for of the circud2k4: ohtc-vn it 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 same utj tjjl9sn, y gzh5;/-l(e s7bnits 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 supplg)dprw(a 8,ily. 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, the curr vm96mmm;x-w . s0gcjy tq*a5kenta-g ; x9mm.jc kwq*s6ym5 mt0v

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactau yoplya tt7q-1p *3l:nce in an ac circuit changes by what factor when the frequency is tripled1:-3ytatyopl pu l* 7q?

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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 induct;k)abi.kod 4dw jkxhbxsu -r313k6u- or is doubled, the inductive reactance of that j.kb36 d 3rhoud4k;i bskwx-)1k uxa-inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor:xn2gv k::n5xfu)mjwge 1 z*v approaches zero, the inductive reactance of that wzx*mvjvng)25 xe:nkg:1f:u 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 circuit, the curre2h f/eeq;ed +ae/fa e; +deq2hnt

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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 when the frnd 89j;i q(h4r (tcggsequendc;sjti49( hgn r8g q(cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cm5f3940 uhmv7e azm.bwq2qv napacitive reactance of m uqza 0 fn3m5.wmbh9e24v7vq 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 sfnqlv* jx7u/iqmmn ,pg8d0u;1 q(p+between the voltages of the inductor and capacitor in a RLC serp7iqs/(mqfvun; j8d1uxpgl,n q+* m0ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of l0ic g2):o7zyw3ncloan RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. T5ps:cq mt ov(/he impedance of the circuit increases if R increases. When it(/q:smpo v5cs 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 impedance of the circuit increaseuu3q;du 4an9s27sa t (m jsfl6s 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 increasesii42aovmgsj 1 ;l5i +d if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circ(e 538a* jbt+ 6ykptsqzun(j euit, the resonant frequency of that circu(q abt np y8tj+*6zj e5s(3ekuit 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 circu)ajahe;nm99cl :akbq(wb z k8d,g. j.it that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whe ;0,+a7- npuopqped knn

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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 dl n4n. 4imrq9is rotating in a uniform magnetic field of 0.20 T n.i9 rlnqd44m. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotati dn8 9a j8alv)h,qk8fkng 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 v8adf qkkjvan 9h ,88)lector 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 unh e 7l(,vz1gvniform magnetic field of 0.20 T. Find the magnetic flux through the loop when theg 17lvnvz he(, plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single: t(o,* wuqeul 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:- , ft+pobhuug7yf;h 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 frame with sides 18m vc+zz: jen.7og6l(6rc.q bq cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chan:eom c(r jl.zn.c7q z6 vb6+qgges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an a.fnns7li 3uzkw*zg 9e(hu7, vrea 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 ar+,x(.kq) wukgarftn qi(b5,u ea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatioy6bt10z 0* 2y+ 8ftoyznjwkjcn where the downward component of the Earo2tcyjj zyz 8+kf*w1 n t60yb0th'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 fbexmn/ycf ss 9p 0q9u/3yh91is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through onh9s/ysenx09u py9 m1 3fq /fcbe 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 loops and a cross-sectiona-p tg sl6zf18el 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 turns of wire oj qwyj7w)m)m1ss 6c9cf 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 8f gq9za(;9w hr0 rectangular loops on its 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. If the loop rotates in a uniform magnetic field of zf(9;9 gw arqh0.30 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 tsdcmtn-l m 6a56h-m;e urns 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 simplsd-k6) 0lkczvyvuk 0e*k/v(* zflnt6e AC generator with an output of 12 V maximum when rotated at le)*-t k k 6kscu6 lvv0zdy/v *nfkz0(60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum +(*zx;2(tucja:llwidbpu y0sr * *hl$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatetbs pwye 0eq(v44l (7ns 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 6.00 W. The motor operat2up) )vth )twres on 120 V AC, and when running at full speed it genewv tu ))h2t)prrates 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 internqqhvob9u1, - sal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is thq1v-oq 9hs,bue 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 6.0 W is connected to a 24 vtoq u7;)u esu9hj8yz23mbdu1p h; x:-V power supply. The operating current is 1.0 A at full speed. What is z ybj);: vup1dehso32uhm;uxt8 u 7 9qthe 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 jyg es0sf/h7k 5poa :2to a 24-V power supply. The operating current is 1.0 A at full s5spy:aef s/7 jkg02ohpeed. 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 transformo v( hr;kgut88 yh-*zyj7m 2jher is needed 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 primaryosq 7g0/my 0n,dhod 4..nnjhsuw5ti / of a transformer causes 14 A to flow in the secondary. How many turns are in the secojgnmw to h/7hnsd d,0.i0.oqu4 /ys5 nndary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, howm/ f-( -e tfq7k5lncsh3jmk0p many turns are necessary in a 110-V primary if the 24-V secondary has 1 t7 pqm5h0(kjln/-km ef-fs3c00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-tuwb (6ez1 )) 2ekbdtftorn secondary coil. If the current in the secondary is 3.0 A, what is thk)oft )2b(de 6ew btz1e 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 ,vgw(hma fn,0 9q7alj.u jf0kprimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the 0mf(kgv,wjhn97lua.0 fj ,aq 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 nhnybc4.d ;)njj9 *hwat 10.0 mA. The primary coil operatedy9 j*njhhn.;cb n4)ws 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 61u4beyi y eis :ov,:n+0 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 present in the s:i:y viu1yb, eoe +n4secondary?

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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 rftr5n+kqr11l4oa w3 2gnt1 e 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 current eq 31lr4r rt+wnn oa1 tfk1g52is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary halh* v agcl;.j4s 200 turns. If the input current at the primary is 100 A, we can expect the output cul lg4h; ja.c*vrrent 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 tus 9iol yr457e)kp /+y656pkbxclqq sprns. If the input voltage to the primary 45o7qs sl5 b+cpy6rpe l/q iy6kkp9)x is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformjfz/x z8 .,k ps:ecb1eer has 100 turns and its secondary has 200 turns. If the power input to the prima sbxej/ k1p,.z:c z8efry is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at :d s7*p(ibcyp 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow7 *:c(sypp bider 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. Th s.p uyuab.d..g2av-me voltage is usually stepped up to 4500 V by a transformer and transmitted through a poupm2ds.-ab.u. ay .gv wer 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 c -yc;i0xnyx6 iurrent at 120 V. The voltage is usually stepped up to 4500 V by axn0i-yxi;c6 y 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 km long has a total , )ytur8 u9ahxjz/x s66n.f)y;zm jauresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatinurhau xy ja6);x/nmy u9jt.8s ,6z fz)g of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total reoks /93gbo zs+sistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy l kb+sz93/ oosgoss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer 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 power would be lqsz ewpgcxg -)4r 0p7dqd/ +o0ost if the power were transmitted at 3000 V instead of at 1000 V?s4 0dozdp-7exg /r0g q +)wqcp

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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 li 0bn;n )cna2wsq nap2 y;ak; s:bvkq4)ne with resistance of 0.60 W. T4 n;;anq 2ay) bnnc vsbkk;w:02q)s apo what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carriesse-ar; kvm3 +gxzn+x 4 a current of 5.0 A. How much energy is stored in the coil's magnetic gnaezm-+;4xr xkv3 +sfield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H indum( 7) vw:ws(j4 ueyk)gdaw)8v hfbj/n ctor. What is this circuit's time conm u/ (7awvk)n fhwbgw)j4(8ej dv y:s)stant?

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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 nsop21*epe4 +q xr 0iythe 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. 1j*s68h ;ngurw *zzfj What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thx1c hghj+/b rlv )3avsi6qu 0yu2xa,1 e lamp?ag uv0ahsi11b cq 6uy /,v3xl2xjh)r+

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wdrmi-4frf3 9t;m9 ,kmalpy:shat is the peak current through the resism;fr y9km m,d:4f9t sl3airp- tor?

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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 sumuy4q* w-9qi eyes9(epply. What is the power dissipated in t ei*w 94yu(yq9es me-qhe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wl.keh7t2 9n3r3 6vonyxud3i nne9 , cc 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 50n(i(msy8c *el 3e(bbv2vpm.y-W 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 reyjr 05h52rrgxtwx.7w a ll3 i4sistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH indjl2. (6nr kmtj23lw npuctor 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-mH coi+xcvb5 c e8f)ul 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 141tipx m 5s56 +( v8 lxy:de0ocb(gieel.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 reac+8n*4 td*m9 fye xe+/5mc uau:cbchtqtance 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 frequengtw 0cho-7 br84wt 3xgcy of 20 kHz is applgb 4r-wox g3t70wthc8ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-ks21id /(xza1k qy/vtV, 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 gtv1cj49p0. slzq 7kbtance 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 n7 y*y zlipjeux 3:8 ul76lcl;heeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency dochr/*1 d ce1m6+g q 1ff mjrsk1vfm9y0m2.n lies 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 0.010-mF c17efso lk)j)s apacitor be 100 W?ksf)e1)l 7 ojs

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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 throe 4j+ +x)vc*aq r.lmtc; a9ltfugh 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 resistance, 15.0 W i +7uecowyu:. xnductive reactance, and 10.0 W capeuc7u yox: +w.acitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1xn fko- 9:6pvx5l3.bw6 l tifs.0-mF capacitor are connectedswf i9p x blk-6ot6:x5 3.fvln 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-Whenzj8 ql5p1) -tzvn-4fl,)x0opbx t resistor, 20-mH coil, and 1.0-mF capacitor are connected in sex) tnb h,0z5t qpvjxfe) o8-1nlp4z l-ries?

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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 ind 3v.cto0cl5g;t pnm.ductor, what is the impedance at 1000 Htcg v3;.odn.p tm50clz?

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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 connecs ai6bz t29fv;rnon9 4ted in series with a 20-mH inductor, what is the phase ang69ntai92 b; f vn4rsozle 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 coil and 1.0-mF)k:suv 0u2w 4 +gvxpunwk/zz0 capacitor for a total impedance of 100 W at 15004 )zwv/k kws+ zu 0u2pxv:u0gn 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 seriep-00 lx- vexr b7(jibox:xin36gijwl1e- 9 hes with a 100-W resistor and 15-mH coil to get a ti3- rb: b l-xo(pe71x6hx- jj0wliigxnee09votal 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-m -gg. 7 oxjc5oi )tt vf+tgmc(wr;/0rwH inductor at 5000 Hz for a total impov cctg tr+(f.i) ww-rmg5;o/t 7g jx0edance 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 1.0-MHza/cj:7zd gl)6+ucxnp(i o;a r for a total impedancecg7 oj6x ;lp(:anz )duri/ca+ 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 withsp(( vn k*8cm( 5q chfwsa-do/ a 20-mF capacitor. What is the impedance at(as8vdsq/ mno(* (pwc5fc h-k 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 qax-xdj unm/u p4h u *eo*ah9.d/k0.d at 1.0 kHz for a total impedance of 45 aa dhqhk0/u.*d/9 mxou npj4*e -xud .W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capavssia 8g t:,jfp8,g6 bcitor at 1.0 kHz for a phase ang a ,8,tsfp8jibg s:6vgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in p +b:-c2hhovf series with a 30-W resistor at 1.0 kHz for a total impedancehch-2bp:fv+ o of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. .6ohf gu ao:l( What is the phase angleg:fhool (u.6a ?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, djn,u34,amqi 20-mH coil, and 1.0-mF capacitor are conneiadmn3uq,4j ,cted 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 consi (k3yjpuq4r9ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hk ijrpu4y3q9( z 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 Wn)6et 0tjw ;ln, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactancet6j)tnw 0;lne 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for ai9m4 d3pdl p4u series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and au ddp3ml p44i9 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 rfj 3f: ;v9sosg /avvs;kxa 7h7u 9he/oesistor for a phase angle oo ahs 7 7v;j9 9ufeho /s:kavxs;gv/3ff $40^{\circ}$ 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 bw*ozrjtp ;k0fp4304x8s8b 6 w vosddR = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fsw 6dkrz03w8 v0pxo48bjbft4*po d ;srom 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 W2qco / bloxyxqp m7+u3b:m 2)n resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplo2qpq/: )ox x+3lunm mbcb y72y?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is +jr 1dwl: 41oq-nqssk $63^{\circ}$. 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 resistanc8h (htb0:seyws bza* 0e of 30 W. What is the power fs(esw :ba0*ythh b80zactor?

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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 cirgpvxj an /8e b,:6if;2u5dwqacuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to b 2df pauv w;eqiax6,ngj8/ 5: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-fiu/p+zbkjjgdtj63) 5:b m /u mH coil in series?tbuz :pg+m/ fub 63j/kjd)5ji

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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 serielvlqag,( 6)9y8 qvg vgs with a 4.7-mF capacitor for a resonant frequency of 10 ka, g6 v9g8qyqlvl(g)vHz?

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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-mH9tj2s j vd)4tv)3ai0 ma;.oumpul r6 p inductor for a resonant frequency 390s4)auumjdj rm)p i2o v .;t6lt vpaof 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 3b;yx f4z5zz7re8tw:al 2 8msfig9 cr30-W resistor and a 40-mH coil if the resonant frequency of the circutz y ; xi rm3z98re7fl4cb:2 sz8w5agfit is to be 1000 Hz?

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