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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 magns01v,zr1pnw-e,-tt fm a-jg ) ongbe8etic 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 stateemzuu y70 ew 0 m+r*pk(:-zjrhs 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 coil produces what kind of change 2sve yl rl8 ((lls(0fzon t(sf 8lvrle l(( yl20szhe 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 produceziy 2 pfb8pk21; tz-nis what kind of changz-zn y2fpib2t;pki8 1 e 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 on6x mkwq0 2v m,ftx53w f300sboqoa +ku the induced +ut02q3xkm6q owff ,3v0bmaok0s 5wx $emf$, 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 field6/s or .59c:7hogko:d-hvw7c h j4uc-hntzdq 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, np3:we i3fl m4the direction of an induced current in a conductor will be that wh :ewf n4m3p3ilich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnbkn 18y:d2 u qr-xnne*et is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fr b:n-urky*nx d1e82nqom 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 oa)ni b x5ag hki/d+b,s(:ut +table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewt 5+x(h ,budaaios:bi )gkn/+ed 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 re hq9wwc83k(z(q3 u cefgion where the magnetic field vector points straight up. The magnetic field vanh ef cuq3qcw3wk( z(98ishes suddenly. 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 tfyzx 17ye;iaw*mvu(.q9nj3 l able top in a region where the magnetic field vector points straight up. The magnetic y1q7e3a; izmljy vwux*. 9fn(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 f;ag*q,dlg d+ o(g:oc in a region where the magnetic field points straight down. The magnetic field disappears suddenly. ,(ga; g c+*qdg:doolf When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries ;vtvu2lcv znvzy 16 1/an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the zvl2 6/n1u cvtz1vy;v 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 loohlpy()vf p.j- p of wire with the north pole entering first. As the north pole entersl y- .(jpfv)ph the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed an on 3+fdat9n9bout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orienta nano9dtn3f9 +tion 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 an axis whosi6* cmgv te9f h(ef:p7e direction 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 tffgp:ice 76e(hm* v9if 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.pscchl l c78i+.r5f s:
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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 anqls gs(5 ci,6z z;t)kr $emf$ 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. Tderqat rvuhxm k9u w30:1,5 9phe $emf$ 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-st3h5 z 2z-g v)mvuvk ala66;ymuoa(,west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a sytg3uz)- ,u 6(5vvs6; l va2ohz akmmatatement 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 ak;) 7-srq+ kt:xzf9e: kajp fzngular 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 generatob9xg0u0) mhknpbf zu tdl6-.3 r 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 revolutions each se wynq/kdr4n1/cond. The frequency of thw n1 n/k4rydq/e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device us/zs(th) 3htsgz 5; ;r: lrrjzhed 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 devicek*)/ r ge8uaqj 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 morex.hy3gyp)+-ap fet 2 (uw;kxv loops than the primary coil then it ispgx-23yhev;f (k a+u).ptyw x 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 po bi,v2 rjt/*orimary coil contains more loops than the secondary coil then itvbo *j/rt 2o,i is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputu837k sh llb/*3i jtmm

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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 circui:r fw 4jo 0sugae4h5e8t,

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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 batte.gwj2 3up0d iyry of constant terp.3yiug2w jd0 minal 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 in series to kgi6 f4;3uh2ifp7gn6hzt8 d o an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo;hzih3kf n p 6 gf8t7god4u2i6ltage 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 .5 +/uxinfqetR 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 rohr2 s tc/z,+desistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. xz/ y7w3q)n ed7dkb4 gThe time constant for the circuit represents the time required for the cud 3/k47q zex)wn7 dygbrrent 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 indu a0yt y l ))c9nm;ojc9rf;n:,nfrwm(m 8qk c8jctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time coyl0jn ,fq;fc m99or : 8r(ca;n w)m8 jcknymt)nstant 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 have the same units exyek0 b5v+p:5 ( dt lm+cpy;lzfcept:

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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, the +cg7pni5;sdx-i58 p p drzus )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 connec7eg14k rbnc:e- p 2150 czxwrdeth)eeted to an AC power supply. In this circuit, the currentd72 x g0-1e w5rerzkpcte ce4eb1 hn:)

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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 ;g; s-jrs d;bu2/zb-qsvt+5 t 6 d4yq -myrieiby what factor when the frequency is tripdyusrgi5z-q/ t4;2vi tbbm q e r-+ss6j;yd;-led?

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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 doublepif )uqc9(oaal6 +;o jl(8wd ,1s ipthd, the inductive reactance of th+wljl6fo() ip1pcoq9hd,; uas(ta 8 i at 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:) qshjvprs+ l1n-qo2 inductor approaches zero, the inductive reactance o)2lq1+ hsvqsrjp :- nof that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thr:zm)w 7r 8tr 1tkt-mde current-rkmr:zwdm ttr7 t1 8)

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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 cha +r;*;w u6f5ef mqipqfnges by what factor when the frequency is tq6 ufm q5*f rwei;p;f+ripled?

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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 A) o-e(1e01szncz-jki -x hual C voltage across a capacitor approaches zero, the capacitive reactance oskj 10czna lx)(e uh-e1o--izf that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the v . tcgfys t*1r)lt)r8noltages of the inductor and capacitor in a RLC seriesyt8g)nt rrs)c*ft1 l . 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 an RLC circu v8vjxn(ol04 uyj0v*u it 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. The impedance of the circuit increases if R ;s0ep 5psmsvvm+*a a9/ s2bb aincreases. Whea9;*a50a s/s pmmv+eb vbsp2sn is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The ia pxn+32 nea9qmpedance 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 increyev64+/uvb(7rhehruial 6 w+ ases 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 a/rzgy 6 dgv.; hmu f2csmzw7b6c0/y0dn LRC series circuit, the resonant frequency of that circuit wilccmvh06mbgzy0u2s 7gwdz .;/ yd/f6rl

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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 resonaps+mcx0jci+i)+ huc wgf; w:cfp7 e- bo 93u;dnce,

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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 circ)opri:z 8z ;gpt5-cwod b ,.hxuit 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 magneti*duoyh)cuxw t j j9n963 11ugjc field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 9jcj*ju 3n yuwd) to 96xh11guparallel.

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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 rotf9y)0 *mdti hoating 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 pey 0om *i)td9hfrpendicular.

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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.g72 dxj3z59 pc+sulbkpn - gc8winh/:h4 0 izt10 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 at an anglzn7cun9x c8:slk/pz pi+hg dbgi0th-3 2jw 5 4e 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 sing z gmuo*myjawd 2:3w1g s3c;5kle 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 ch(cr3 dn; avm1r df:fr*anges 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 tur: bpmfjb6*( e1hc3fcp ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular teb 31 (fp:fbmh6cc*pjo the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ofmw87u) vdqund er)o) 1 $0.40 \; m^{2}$ 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 arer* zks/ag 8ufme;.f 8ta $0.20 \; m^{2}$ 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 an;sq 7fknlm,* -da 2fat a location where the downward compodf* qa7l;s -akm, n2fnnent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rf.c 5u.gy c;9ypqsg7that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throughf 7upyg.c9grqys .c ;5 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 loops and a cross-sectiokma b (pdbd q*qj8nz. 2)w kgo;5+ui-bnal 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,g-p42 +dv p 2ojxllnyrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 (8f *scdhrhg.s/6 8 i:hz darbcm 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 0.30 T, which is perpendiculr*hsc a(8/:sdi dh gf8 6hbr.zar to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area 4 k-pgq7alst,+y :mqcivp (:m$0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpu.a mi: dm*8tzkt of 12 V maximum when rotated at 60 H*it8k. mmdz :az. 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 generatorfgi -a+ h5 y58hrcfts9 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 resistance of 6.00 W. Ttme 3 f8xhb(+lhe 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.jh9esc k8fyr gc-weal ;9t9 g*t-o f9/00 W. The motor operates on 120 V AC, and when running at full speed it generatae*fk99jg9rtgto -fc y9h;- 8lew/cs es a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance .9iuo jhajlq :y f,+y26.0 W is connected to a 24-V power supply. The operating current is 1.0 A. j+ol9 ,:f .2 ujqayhyi 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 resistzaxgne7d )s6p) ys*2gance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 gg p7n*saxy))e2sz6d 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 cow; 6a 84:gex/lvd0 fxlbsn(xhnnected to a 24-V power supply. The operating current v(x;l0dn6fha/:l e4bwgs8 xx is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prisf.(9d ce2 l tr0mt+zdmary 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 primay5fnw/;dt 9p nry of a transformer causes 14 A to flow in the secondary. How many9p nw fnt;yd5/ turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are n y: obg 10ft)dy2jtrk.ecessary in a 110-V primary if the 24-V secondary hj)2y b10rt ogkfdy.:tas 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn u0mfb.e/+a 7) qvcwhasecondary coil. If the current7c+q /u am)0wav.fheb in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a tp1 s/dq4*e f/pbtlwp1ransformer. Assuming 100% efficiency, howple pbfd14pqw 1/t/s * many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon ri duv9; *6,oa xvftswh((zl4sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dsz( *,9u t64r;fw (l xovhadivoes the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300x7r9g, gq:arvsk6iw, ;hx l2vu c y3y. turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondx63 .w: q,u rl;grhk9 g ysiy,v72cvxaary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primvq7g 9teg .lp o4jr.-ei7s x/jary coil and 300 turns on its secondar /gj et.rqe7vi9jxo4lp g.s-7y coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondar12vlx -rk*k mg zjfx57 /4qmluy has 200 turns. If the input current at the primary is 100 A, we can expect the output cul4zk/xmf2 q 5r1*mxl-k j7guvrrent 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 turnni )b dr7rbxy4 r1xd-8s. If the input voltage to the primary is 100 V, we x)rr17y8xbr- 4dd bin 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 transformer has 100 tur,s2 pzh;voi 22m*y5hx +m jqdlns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fri d52 ;ql2*o,vy2jxsmh+hpzmi ctional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage3ht7h igu d-jk0* cvk9j-t1 w tbqmu1( is usually stepped up to 4500 V by a transformer and transmitted through a pjj*1tw iu10t3hgkvdthcb( 7mu--q k9ower 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 1p+u d o;e:zsm+j h:-po20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentao mpde+:p +ozjh :;-suge 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 producesy iivp/da3s ) ixfxavq4688-y 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resi)4q8i6y f8dvxaa-s3/ v xiypistance 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 l004q 2tq,: / fdmwoqvcddwo .km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transfor w0.q0cdfov d2d /w qt:om4ql,mer 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 transmissionp6mco2d--:pnz gbzynwyg3d ) al ,e80 line 50 km long has a total resistance of 0.60 W. A generator produ3my- d2pwg,z 0pznny:ge6bd )-coal 8ces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What 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 100zeo:1dy+7ag t0 V. How much less power would be lost if thea1:teg7y +dzo power 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 oryyj -w257uly-i 5h jtn 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 i2y7r5 y5hi juylwt j--n transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s6m) n( e j;ifim(,c .whrcyc 8 */b,l;mwudtdutored in the coil' *ci ;u e;(idcj,uf/m8r6( )lhcdm,nww.ytmbs magnetic 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 resistorrh;z1,g b8m3z( h zxfd/(yuxa and an 18-H inductor. What is this circuit'a1 myz(,;x3 rzxdg/bhhuf( 8zs 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 wuq gw l4u+k0j5here 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 fji mbjv1c l;4d -*xl*outlet. 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. uo+*0y odo x5i What is the resistance of the lamo5 o oxdu*iy0+p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is c zzgf4 :qfh(ilk1mf 3uk+/a( oonnected to a 120-V ac power supply. What is the peak current throu4 zf/ikf(3u:gf zoqha+ l1mk(gh 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 toafs3v . su;h-u6od3 ko a 120-V ac power supply. What is the power diss u3.d-voo 6sa;sf huk3ipated in the 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-W resistorl3 qcn sqwyymq:). ++ w+vya6rje4sa1 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-Wl7 ljp( a.y0ggpfjm7 9 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 resist.x-3ck n,rgiboo4 i s;or 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 q bqz,jy)l mbm,j /k02x-yvo 21.0-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 cg1,2rrb 7 gktn*q3b qa 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will f0i.d cdlx,8e7tl 7tna 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanceeg. h*z+vb6vds: ,cl j 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 inductmt pse,,u(m f1, * km3zjin0ttor when 120 V AC at a frequency of 20 kHz is a*fi3 mmmntt(j ,0pzs1t,ue k,pplied 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 fqk-;6p z+ tactx0.ul110-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 capacitor at 10 kHb 65mip rbxw n-m-ef w(**cq7tz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is0b)kwjf -s4h d needed 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 does a 10-mF capacitor have :f+wa987 w ixwg t3tcna 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 reactancas3q; tmy/,56g erndte of a 0.010-mF capacitor be 100 W e/,;qmtnr6d ayt gs53?

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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 throo/x-.:7;tv nvq fnk gdzbrwctf62f3,ugh 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:om 7 l/hetf;g68bcfu.nq) loe . v.i p;g,bsi 12.0 W resistance, 15.0 W inductive reactance,n o,.e:s7f b/.e;ulmfht6v;co qbpi gi .)8lg 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-Wyw oszzn 5bd8pdsnq:1h6 nl3-ov,0.i resistor, 20-mH coil, and 1.0-mF capacitor are connected in1vyo: 35id b-w dnsl8,hs n.pnozz6q0 series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH cl 8zb5wx2c o6ooil, and 1.0-mF capacitor are c68b5zowo x2l 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 resistorz 03aoe-hz9r a/oyf4f is connected in series with a 20-mH inductor, what is the imp f a4- yoe3r09faozzh/edance 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 * dpj5b9wtb)) 1r5hkt cq7ozei8bg/j with a 20-mH inductor, what is the phase angler zt9d5j/o) 7w eijtcgqh5pb8*bkb )1 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 seriet9gv/efhc vvrw-nv 89y. w d:5s circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15 /ve899 -wv :ycvngd vrfwh.t500 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 serieobsym7yd.0cp c)bp1+ s with a 100-W resistor and 15-mH coil to get a total impedance of 117c1.d y p+ ypob)mb0cs0 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-zig 6 ,s.e6a7 o/a ocgiu5ct 6ztlnk- Hz for a totalze-/6zs.7tgocgtu i l,kia-na o65 6c impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-Mj q,snua x(*,nkvr+t 5Hz for a total impea nr,vqkt+usn(*,5xj dance 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 the imln5k4q u2 en)opedance at 1n4e2)q5 lonku000 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 at9(tf2o:ad1 mjc2ni v/ r2zwo p 1.0 kHz for a total impedance of 45 W2:29jda mnfwio(/ orpc t2v1 z?

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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 wiya4nl otvwosf 5os: s(*r7+ 5eth a 10-mF capacitor at 1.0 kHz for a phase e5 (ws 4fly5von:s+s r*oa to7angle 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 series with a 30-W resistor at 1.0 kHz 2 xekzzzr8,xuba: 5jm6pdy( v06ei /ofor a total impedance5e/ :(mzj8ora6 zu0bvpz,ix 6kd2yex 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 1004frwjp3gednix+1mtk- b* :k ;-mF capacitor at 120 Hz. What is the phase angle dt: 1-kmrp*4e i+;x nbjkfwg3?

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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, 20-mH coil +-szs qyspr0ygg4v( * xqub)8, and 1.0-m4g-sps +8z * u0b)(yxqvrysgqF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, a y))m5x-qxb( wqps:msht -hx0nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cum yq spx-x-whmhs0(x) tqb) :5rrent 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 1 v r1cf7 q9z-9aiy9 aw1pgeudv8b)hcreactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sour1bhvrva1fuz q 7 c9)-dwe gay89cp19ice. 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 sqb*v2hi9 no zs x--q0xeries RLC circuit containing a 50-W resistor, a 10-mF capon2 xb--qiq0x sv*hz9acitor, and a 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 resistorky/e z( s5sr8d for a phase angle of d(8zk/ se5rys$40^{\circ}$ 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 yql2mze /.7wo8hzqvvn7y p 90.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in qh2o yzv ly/ 789pm7wvzen0.q 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 ou7x f)jaz v*+gravt t*xrc u;-4tput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whenvcz4t- *7*uvr;t)gfr j ax+ax the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci dti5y9t ots o78zkh,9o4yv q.rcuit 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 ii 35f8fcmj.gh mpedance of 60 W and a resistance of 30 W. What is the power fi.gmc3fj8fh5 actor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W ret4bcx/e;be1, lm2 uio sistor, a 10-mF capacitor, ax4,ctbo1elb;e2 / mi und 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 resonantqj b wnl6pb27s41p4hxdhj 88ja0yod8 frequency of a 1.0-mF capacitor and a 15-mH coil in series?h4pb18bd8l j4s8w0 ajhpx2n67dy q oj

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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 a kccf7w40 ((yz 6ql aey g .ju:uyzr*g)resonant frequ(e jcu cly ggkaz0 rw7:q.4(yy)*z6ufency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freqshtrq/1b7k7d / pz 3unuency of 10b u77hr/q dptk/z13 ns00 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 anrjm/ 1cw8-t1jgu 192wvp nc jvd a 40-mH coi rv18n umjjc-/v 2gwc1wp9t1jl if the resonant frequency of the circuit is to be 1000 Hz?

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