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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 magnetic flux excep;aetqme0 9e 6ft

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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 st bh. 367 cbedbxy3/mph. ith vj(v63ptates 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 kinz t1vdf .ai2qh 3 ymv)u+j v;j pss19z*sr4y-ld of change on tzyqv4h-2) jdl*a9+.zm3frp11 vu s; ysivjtshe 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 loopdkn v8 cx 1-*nyy+db8xqpjs1 /6i0zhs of wire produces what 810v+-jnsdn6zi sq*1bc xxphk/y d8ykind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter czwd3c 1. )vbcof a loop of wire produces what kind of change on the induced.c1 v3bcw) cdz $emf$, 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 magnvr)msa7 a,dd9rwxc911ky 2 c uetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced mq 2 uw, h+vf8m8xk*npcurrent in a conductor will be that which tends to prod+mmq*u2 k8hpfvnwx8, uce 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 magp-thqkl u2;ow1vbpr0 n..d 1tnet is held above its center with its north pole pointing do.2lt1p .uh tkwdv0b1rn -;qpown. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovc9+ ru/ seflyc qcmd::y31y j3e its center with its north pole pointing down, and released. As it app3ufy:l md/9cs rec yyj+c 3:1qroaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectorphkjx n9+4ev - points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in h9nxe-p +kvj4 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 levet i4d*;e1f7v crr,dxxs 9dbu8l table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the d xbf e8rsi;*7u rxdv,1 c4td9induced 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 where the magnetic fiel w* 86ox jg)(nyqa oavg iwmikvo59:70uv-2ghd points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of t: h8g5)6oo2v-9na v xuim0k av og(gywiqw7j*he 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 fp x41nuyv9e73s i/oalies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vinof/9a1xyep vus 473iewed 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 -) 9xvvenoo0 8mgcz1t entering first. As the north pole en0ecv18mv no)o txgz9 -ters 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 sp/mp8n ww 3eh fv566jq vey5 7.cij6ezoeed about an axis whose direction can be varied. In a region where a uniform mag5nz phyjqo5c / 6v6v6 efejew3wm7i.8netic 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 c4vzu 3fz6c;2,dd) 6uqs;3wb hpoh j eabout an axis whose direction can be varod3 pe hj ch)cdz;bu3usw2fqv, ;466zied. 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 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. ;z5h3 ex:vpj3 5k( 6yq1ikc*acue efk2 g.rpc
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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 th42ewg+:nq rtgn s) k;- sw,rsgat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magneticpjhy-e+rw2 )+itr / (mdowql ,mvs/x7 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 directionuxq x7a 6ce.x9) is moved northward at constant velocit7cuxe.q96a x xy through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocit1c,q3 fznwgo* y $\omega$ 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 -tax 1ml3y.qoj vtdbs)*s 6 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 60ti a0ripftt,+0blc21 revolutions each second. The frequency of th 0ira bt+itc,pt0l1f2 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 device17il wh77j9fmep zvhs(j 8733x nus ai 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 def/uv)ji*/dx d,- 0fxnvf1swxvice 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 thanikjf,*/2ar yx the primary coil thenjkra2x,fy/i* it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sirn; pkcew9v(/x 44 lrecondary coilkirwe9n/r4 4 lx(pc ;v then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the )zhq .3fs2zyq 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 circ x j60otx:z9zjuit,

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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 induchxij-: 7 ivs oy21q+(fif nbn,tor are connected in series to an ideal battery of constant terminal voltage. At the m-vf 2qxni+y7fn bio s,jh1i:(oment 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 seri doe2f4z5 2lcehjg abe+, +f-res to an ideal battery of constant terminal voltage. At the moment contad 2e or-h eza54g+ljcff,2+ bect 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 i t:uq0 ha9/rwhnductance 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 is connected to 0 xk1ee4d3nw fz1mw-zan $emf$. 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 conne-yd j4 a 4+xnrca 6sf/dqw3f-v3ilr8jcted in series to a battery. The time constant for the circuit represents the time required for thex dqa4fc+ ifjr4-6r33d8v/nwyjl-as 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 batt (0ym nwjos 8)mz8xkd6ery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curren80ymwkxnd68jo(z m s) t 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 av,1gjajuq *t88l1phth-g0v d* lx;sexcept:

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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 aqx8m- 0ci-ehsupply. 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+mu,s2u +;0ko v zwyhi3 eugi2, the current 2+ mwu 2,i;sz3 voeuk+0yiugh

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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 awz( hqfws1,u/ n ac circuit changes by what factor when the frequen us/q,hw(z w1fcy 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 voltage across an indvp5ao-yh+ : aductor is doubled, the inductive reactance of t5yv oh:-ap da+hat 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 volt,l9np je jl:u3age across an inductor approaches zero, the inductive reactance of that co9plnl:3,eu j jil

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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 connecroj tqi.o8(dreul 50 apw uhm/g )2,h0ted to an AC power supply. In this circuit, the curre map0uuw(todqj/50 hi8 gel. ,2ro)r hnt

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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 anx0xa9xwy+4 . i r4hkug ac circuit changes by what factor when the frequency is trip +w9ax gxr.4 uihx0y4kled?

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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 vk 4o+m8ak.ul across a capacitor approaches zero, the capacita .vmo+lk84 ukive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltagesg7s8 rwpp zp38 / tczsqsol).* of the inductor and capacitor in a RLp8 qlt sr3s p87 *)pzw.cgzso/C series 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 bnp znhsb; w5c;1:; xzRLC 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. The impedance of the cil qbig73 smi fp+2bv +ex9rx0+rcuit increases if R increases. When is thi sq2ifb3p xb0 +e+rilm+x7gv9s 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 impe 9 z(w,z ruiowg3(y:hhdance 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 cied/nbp 8h1z)qeda y /*l5m7pv rcuit. The impedance 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 both double in an LRC series circuitg.fc ;a0baf3e, the resonant frequency offg0 ;e.c3baa f 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 drpmrpb+0 qmys)iyn3fxc j):82iven 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 cir7csoqi0a0 cy9x z5g 7dcuit 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 fiel.p)l7vinay k*d of 0.20 T. Find the magnetic flux through the loop when the plane o ki7*)vp.la ynf the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mag/5;saszizziv1 +8 rjxnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and; r jisxvz15i/+8 aszz the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m v.1: qcrzdnbl(mf 5kgx8ia; 2 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 m 5z2lk8(im cnrv:xb qad1g;.fagnetic 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 is ,94 e z(irl; :chiu:sgvur6;o rt4nxoreduced 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 cht71t82/r0y/ /c nbnf ern /y5dyckeunanges 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 2000 ivy ja. ;,ccn)7:bz8pqhmotd+ty h* turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If th;hc)p+*qj.7yv0y oh8z ncmdiatbt ,:e 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 of7imztcxn(( 4gbz38 x8,n pfulcm/9mg $0.40 \; m^{2}$ 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 area,k-2rrf8hlaw9n l r*r $0.20 \; m^{2}$ 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 fi *6o mk3fe4*ffr)g4 ggb /*;sf ucaajlies horizontally at a location where the downward component of the Earth's magneticjc 6gbr4oeisfm*g*u f;3/* )afa gfk4 field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular (c lki-e;aq -ivelocity of 2.0 rad/s abouiceqi ak;l-( -t a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loo dx2fxlbi u0vs38/s+ yps and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consi5k.0dopa,x5muq juu. sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 recpl( qp :lguj-+tangular 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. (j :qplu+-l gpIf the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tur- o zcs, u50zazhevx40ns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 Vebn25fl;p4x6dlrf0md y) tv7 m1w ui ::jnds9 maximum when rotated at 60 Hz. A magnetic field of 0.050 T is n u46 l 5xey;jltsmpfbm:2n)f i907drv d wd:1available. 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 generadkar 6ur) z1y/tor 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 az3 ;ye9 soro -(wda s6zrj6yf+ 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 6.00 W. d4pz wnyqd+.u2uw6 . nThe motor operates on 120 V AC, and when running at+ny 4pdduquwn2 z.6. w full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V a6h8byq.ph,js s ;p8wo 6 m6zjpower supply. The operating current is w,s bm ao 6;pz88.6 qhpj6hjsy1.0 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 resi9sh*bph w j )ns5.qvj9stance 6.0 W is connected to a 24-V power supply. The operats p) v.hbsjh 9nj*w9q5ing 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 connected to /7yubp8c-z 1,hwm f,qzn1g y7gc.jqa a 24-V power supply. The oq fbjmpnz/q1w1y7,7,8c c auz -yg g.hperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltbw)lda) 4ht(d age 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 primary2n uo j+ja k5gdcv2wss7 g1+7p of a transformer causes 14 A to flow in the secondary. How many turns2juv o2sk+jng7c ag d5+p7ws1 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, hoi zrrl5hmo gj6l,m;+gdujm 3:q :z( l;w many turns are necessary in a 110-V primary if the 24-V secondary has 100;m+5g6(zo :ijm ulhzldl qg:3 ,mrr; j 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 ilqs z+5h 0rj+coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cs+r hqj5 0+izlurrent 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 transfu3:,auj *uly hn.jx-zcgi) 4c9dl;sxormer. Assuming 100% efficiency, how many amps at 24 V can flow in a ngs4ccy.l-z) 3xjx;hud *u:i9,jul 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 ry;fq, z5(vgy sjtl*g.z9du * transformer provides 7500 V at 10.0 mA. The primary coil oper.dv5tszyulf9; z * y( r*gjg,qates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and xx j8(kk2rt 4 /d3f; bwym1qho300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, w;bkywjhdfqo 34x/1 (t2rxk m8 hat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tudg-d8ylb m7 i*rns on its secondary cod 78d i-lmg*ybil. 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 i0mkrja) zw9cxi5 vg./bi(o*w(3 ffh its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpu)g5 0a3r m/vwxih*c(kbi(zfof j9w i.t 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 it;c uhv p1x8 lvl-gulwj6 37:gvs secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect th:cpx3l-1lvvgw 6 l8;7vhgu jue output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2ye./ky4km 4 z;a8 xhvt00 turns. If the power input to the primary is 100 W, we canmy.4ekxkzt / v ya84;h 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 0x u hv(0 dg0 kqk4vpu19 bpp2mwn2-ehA 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 resish1 xppnb0dge 0p4u ukqhv2 0-v(2m9kwtance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s0o*1pxmglb tlu5d 3woq; :8 nvtepped up to 4500 V by a transformer and transmittg0qluxw35 lnp;db1o 8mt* o v:ed through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltfm 0/wjiuvxs9 os f,65. sl-awage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resiso-w5 uss i9xlaf0f sjm,6/ w.vtance 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 ins-c8 dh:qo l2k 4:lko:g3asline 50 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 8d :k:soc 2nl4s3qkiag-h:ol heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance o7h247cmozsjc tce5(3 ip jkf8f 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 is lost when the transforp h4ick7t5co28zemj f7c (sj 3mer 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 -7 *xgdii 9vjp7q1vee-W line at 1000 V. How much less power would be lost if the power wexq9ej*ve7idvpi 7g1 -re 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 w9 prr(r tg 7cn/wfalz:(v6ul;ith resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmissiv( ua :zl( r7gl;/rtcpw69frnon 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 cu z sxj.gnq,d.s:sd/*/ j abak8rrent of 5.0 A. How much energy is stored in the coil'ds/n.k q* b zx/ ,.:jsadsjag8s 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 resistor and an 18-H inductor. What is6gz 3c:odgj8l)f( piy this circuit's t)l pfg cg3:jz(i86 doyime 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 o 0co88-:i abyh0iqm 7s ok qbre-o4w,pn 5dj-the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak jgg, i 1qjwwa4o/tn+no 1q 0(fcurrent?

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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 thzi/dr;lm k,st,qkodf( s* 2 e9e lasl*/tkr 2z ,k o(di;s9 fmd,qemp?

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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. Whatqk 8vsr: xudctsu862i)o -l a, is the peak current through the resistor2)o8rdqctulsx 8v-:,s6auk i?

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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 connec62ijbmtx8txi8)w t 5qted to a 120-V ac power supply. What is the power dissipated in the resi x 28)wx8jtitq6 5mbitstor?

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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 resi)/fj:qzc*qwdhww)-x ,/ e mqg stor 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 re.2o out/f5 cawa 8w3fcsistor 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 resistor isu+n52 9s hk kmo64l7/fy;e:uhicq k uj $I = 0.80 \sin (240 t)$. 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 4sm hba828 bxu1.0-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-mH coil at 9t3qx l0meat8 0p 4zkd1000 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 /. ax hpub/om0bbd:b9 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 neg, re3*hmwo+ r a9o1mecessary for 157 W of 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 on/t h1rt5zll4f 20 kHz is applinrl/t4zh lt5 1ed 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 coils(fe3-b 7f gf(rd1 2yrix+f:t l lll2h due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitiv plb+8 yn(4rv *my,cvme reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 lqoc.csquv6,j0+i* 0kgu m 1yW 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 a reactance of 12v8b wrp6nd3alo: 0vk.00 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-mu1 vj5j7i xvt4F capacitor be 100 Wv51 uv7jx4jit?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacit5d jomg. y*5kid7g:mkrzd/l2r sdz * 1or 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) m nq.3ka6gami9u v.j inductive reactance, and 10.0 W ca an)uvk9gia3j6m..mq pacitive 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 res rnfrg,7;1wbp9 pmfj2istor, 20-mH coil, and 1.0-rg;p,n mf rp12w9j 7bfmF capacitor are connected 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 adb c-s 6b/xn; )a*lxk4 bmodxa w-i(6k9t8fta 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesxntx-d k 46wa/a6fmk l(dsa8t *o9 xbibc) ;-b?

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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 connecteci3hn/mf a0qq2mb9 x 4d in series with a 20-mH inductor, what is the impedance a24hbf/9qim cn3x0ma q t 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, what ib- ; 1c7tdzjk 41gabvas the phase angle at 1000 H1a gz-cd7t;j4vakb1 bz?

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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 zd e4 zx0f tp +9t+:6iqyz-rcuseries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 + ztu6p4xq dz ci-:tzy+9 r0efW 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 series withlm /pu1s6al xk9,8rwj a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2 jlp8lr69/mkws,1 xua000 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 Hz for a ;h. uzt.5s w x1ijblr1total impedance of 400005.uxr1h t1wsilz.jb; 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-MHz for a y opj8))ntylm;w;k06- dskvr total6-pnkw rsdymkyj8v; t)l ) 0o; 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 8+ it9/v nv;qru xlp- kvwa5b.a 20-mF capacitor. What is the impedance at 1aq5wv+v ;9r vi utx-bnlk 8/.p000 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 atyyaab1 om58y , 1.0 kHz for a total impedance of a1amo8y y y5b,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 10-mF capa .b yxx f6c6u16dyx;5b3yacdxcitor at 1.0 kHz for a phase angle 3faybu 6d;6x. yycb5 d16 xxxcof $40^{\circ}$?

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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 301e*,bh 7 n0h0 76ttsukac+cn ma 4d7 i6gbbist-W resistor at 1.0 kHz for a total i i 7nedsb14ia k*nh00accmbt 6 t,uhb6g+s77tmpedance 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 rv 9t/1j93 tcxm)wfgaat 120 Hz. What is the phase angle rjc t)/ f9x13gmav9tw?

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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 resist)4 pe(mmr hn md4s3ti)or, 20-mH coil, and 1.0-mF capacitor are connected in series?h3( rm tsi)md4p)4ne m

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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/bl6z 1r ;:ewx yym9*zjr . e)kqy;oqs 10.0-mF capacitor, and a 0.350-H inductorowjqm x ebl 9r)z;; s*ey/y :yz6qk.1r. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductz5b*q*yliiu1lmc8 /nor of inductive uc1n*5 y*8bql mz i/lireactance 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 a series RLC circuit cont 0dr p5svsxob:qt b- ko:ni)+/aining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppvosdpb+qx no- : kri)sb/ :5t0ly?

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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 wit+ ogtu8 p-eb1knp/ q3uh a 500-W resistor for a phase angle of pk-qgb83enp1+/o t uu $40^{\circ}$ 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 = y+ tqhv80ui y-10.0 mF. At what frequency should the circuit be driven in order qyt u8+vy 0ih-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 1p)) f;aswavw3 2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reaw)wf3p sva;a)ctance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuczu k ;rp1m/g)a(rhj .it is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What es tdbbh:3r*w2 7jee7is the power fact2 seewrh e:d77 b3b*jtor?

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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-W6 0u,q)kgf,mc5fhpia wr9 /ek resistor, a 10h956iwqupm0 gkr/,ce),k ffa -mF capacitor, and 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 capa)rt +spdn, x yv/46tovcitor and a 15-mH coil in series?y4 s+dttvx,) 6/np rov

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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 withp+z3 y4jil2 zrmoa,i 0 a 4.7-mF capacitor for a resonant frequency of 10 kHz?zoy4pjml,r2ai0z+ 3 i

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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 fd3h 1pzzc*-+(hedgopj v.kw -or a resonant frequency of 1000+h -.w chokejpzv(p-1dgz* 3d 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 pl,r(nf2 l6/a ds-705 tfhmc0 myb ruupyaced in series with a 30-W resistor and a 40-mH coil if the res5,b-ny( /hufrf0u rs07m2d 6lcytmpa onant frequency of the circuit is to be 1000 Hz?

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