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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 excsf jic5nd8+m,q mk i q:,t*,iaept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that topb fv1d zrj 9*c1n+:she $emf$ 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 0bm,deu/cdn 70n-h fjcoil produces what kind of change on the i/-mn n7fddjc eb,0u 0hnduced $emf$, 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 produces whm6po *jsv -bz3-rcje/at kind of change on the induced 6cso *j-rjzpeb /-vm3 $emf$, 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 o/3w/ur f i kj9nt6jy-xf a loop of wire produces what kind of change on the indu3 k 6j j-nurwyif9//xtced $emf$, 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 fzf3 jo/z1qf3n*elg 9e*,3zc1nf q clxield 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 in.xndscr d bv ab7z*,-llc1jx37, 5 pwtduced current in a conductor will be that which tends to produc xp1lc 7bl bcw7svd r. 35x-*zd,atjn,e 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 magnet is held aboved6 qz2k yetpb ;put 1qs10u.4o its center with its north pole 12p 0uzseto.uq1db y6k ;qp4tpointing down. 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 fla.gi+ev(pimz1iy / h) ot on a horizontal table. A bar magnet is held above its center wit vp(.h)z1iey goi/+mi h its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector pocx3mxwq r rgf2d21p ,9ints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of 91wxrgfrmqp3, dx 22c 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 s 7y 0(+,x 0b8;irbfmwgdpggsa level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly growgs(g g 0;r+pixdy8mf 0s7,bbw s stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnz .; x /foi5landvx:2netic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil asn z.v2anx;:xd/lo 5if 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 an ever-increasi1+ g;n,f lty2e7ygqny5 wk 9arng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from ab5g7e,ynw qy1; 29 ry+fltgka nove, 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 poles0tg 3eqpd i9hnl*m.3 entering first. As the north pole enters the wire, theg3h t0q s3m.lpde9i*n 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 rotac hm7ndl,3:ksx n/ron2, :xpm ted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnet:/dxp ,kc nl37m,2ors:nxnh mic 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 an axismjq hupl 3 25iaaf55y(kfe+ c3 whose direction cahq5f i5+eu f33jayap m5 ck(2ln 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 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.22gxc xm+b nk,07a9c sbhxb*kv5+tkb
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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 thatp1n3ltafoc r.uy+ z13y dwils6a)*+ p 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 magnetic field. The j0cglh8 8xa p4$emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) gi 7 -p95wetnxis moved northward at constant velocity th9pte5ni7x- w grough 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 cony)trveye).: :9/+ sy mp eywxd3 elm,fstant 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 transform vu(h5gnqe5*q,epv: c9ibcdp 6j e-5fs

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat ltfqp,x 1vv;1es through 60 revolutions each second. The frequency of th;qvtlfv xp11, 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 devi)se4jkolybg),/f0 ct1ux )ea ce 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 tkqw 0r 6qo k)t-wub9n9eim5( yhat

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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 tqj*7 jl h3;sfab 9yzg,he primary coilb 9jaqlyj*sz g7,;h 3f then 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 sec( ;;j bs0i3wl o*tk,is7cjc la; fsko6ondary coilij ,l3 oo*;6cs iks7c;0afskb;l(tjw 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 power inp + .w+ojl,5s yko0dsrbn)4lgdut

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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 circl:gks , :vte/p g+*czbuit,

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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 con.u9(uubp u: xfnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltuux(u:u. fpb9 age 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 an ideal ba1; rr pq8ygysj;iq 7a,1t d4nj+ln b(cttery of constant terminal voltage. At the moment contact is made wts lb1n;igc;,dnarjj p(8y 4q+ rq7y1ith 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 rtke)qv 02: fd-qye:tjj yqlns,(al6 (esistance 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;eucltx mq lqlf .06)+ 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 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 inductoe y7q+1rdn4dg *).eriwvs 1tw r are connected in series to a battery. The time constant for the circuit represents the time rvy rq1s1 dg)+wet .7wr*i4nedequired 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 batuhh 1tpoz;blt2x:5 . itery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the ch.1:xiht pt zou;b2 5lurrent 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 unis 2me7l 6;jd(ihuwxyw *y4-cg ts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply+k+ geodmzwzp8. : ,gm. 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 conneq i 3ga4zof2qb;c c 64b0*r jbv1dtaa.cted to an AC power supply. In this circuit, the current2b3;ava4qb c4ibqd zjo tg 0*. r1fc6a

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what qpza )c lpq 3 a*65c*er8+h8oz*hqvz zfactor when the frequencyrah*8hvl6 )3aopcq+ze *q *cz qp8zz5 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 inductor is doubled, the induc,0es:nd bw 3-*onb znvtive reactance of that induws d nne3vbbon0* -,z:ctor

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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 in 2d1hk gnlnkv.72zr5g ductor approaches zero, the inductive n7lz5v khndkg21r2g .reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. -e2xl dpj9f f26k2hk ex53l jaor*jy5 In this circuit, the currentr 92hjked 2a3l5kx2pe jx*f65o ljyf-

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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 whac3qk qpw 2gmo jp6zkv//di s(,jj2z/2t factor when the frequency is tripled?mzj/2 ,2 ( gd2k3/i sv 6zjwp/qkpcqjo

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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 capa a vy;v*eh-;qtg71okb9/l prbcitor approaches zero, the capacitive reactance of that cap; q-ab7gr v1/oplyb9k h;* tveacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor iq r0 zmp, u5,uuk*rdvh 3yvk517b/ckan a RLC series circuit?uq avu kbz/,y0rp1rm 7c kv,5u5khd3 *

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defrcmb9cx: x-e8ined 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 io t:fr/kf- u7xncreases if R increases. When is this stateme/kufotxf7:- rnt 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.s z ozehjwk.p beb570e:b+j-1 The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuitg) r7ha/k/criag i ,+x. 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 serief c+65,l fv(* zq 3a nvtbfxm:,vsx4pts circuit, the resonant frequency fsvx*lm,54v ,qf ta6 (:t3zxfpvc+bn of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is dri uqs8l382 lhziven 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 occu 262 jxkv lzb99yylx3wrs 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 magnenjnzt.uhh x1ph,p-80tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel. u -ph0z,8tp.n 1hnxjh

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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 maghp mnm+t) g-hp;djjmn8c;* 5**mr w ubxer y/)netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m urm;ty*5xjphh-r j8c;+w )ed mnp) b**/nmmgagnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fhqhc/ k:g 2wt.i5p9l pin9:j hield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve5 :9i:hjp nlg9 q.wh pci/k2thctor 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 reduc7b,0 jt pvx4teed from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from rxhd kvw,x d9slrb3594t.y ,c$4.0 \times 10^{-5} \; Wb$ 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;v* qwo-:nvmd klwpkm,v3 6-r 18 cm. A uniform magnetic field is applied perpendicular to tqo -dp :m,vv3lk;v6wn*mk wr -he 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 tur+ks ,9*h orga+gfgcta3 k;l6xuqv- 9f ns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ares /hx9 m69qjdza $0.20 \; m^{2}$ 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 horizontallypw,:ro tn3mqz19nk 6z w6fug3 at a location where the downward component of the Earth's magnetic 169g 3 uzr3nfn:wptkzw 6m,q ofield 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 than9cn2; )ndg 0hpb1;+pi yep pbxs)gysdt ;s+1t is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a v 12;;;) pseb ggn)dn+sxs0nyb +py 9cptd1 iphertical 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 loopsui vfx ldl) t4 l7eb,(-b(qh-z and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of vug2x-8b,)7 tsa li9ie/t/m nib+kvvwire 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. 9sfr4.t0y1*hx8lm zs2ecr s a 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 0.30 T, which is perpendicular to the axis1srezxst0lsmr2acfh9* . 84 y 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 tud,: po: fsz;xrzc4.gq k +c5+fxd7rtjrns 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 s e(y)p5x vd;qi,bbw3k imple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the( w5dq )byxi3e ,;kpvb 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 generdx5o*,y;uupl u)o:1xr hyo rr l,8j)mator 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 resi3b eo 0-8m*4k0bolatiy6sju s7g +tv vstance 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 resis 6uxi6-b,nsg 3uj/hcotance of 6.00 W. The motor operates on 120 V AC, and w 3gu,xbi6ns c6- /uhojhen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is cocz u-j6uhj)dnpuov y9215 xqgl9l ,(q nnected to a 24-V power supply. The operating curr d25zvjj9 upxqc -)hlygu,96 (u1nql oent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of intern:y ie3yu9hrot, ,+haa al resistance 6.0 W is connected to a 24-V power supply. The opeuahea i :h3t,o+ y,ry9rating 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 a 24-V pjn 7v8n2ona ; hnu89 tfi;pv-xjvrt--ower supply. The operating current is 1.0 A at fvv7 jn29h;xn tp--vin rotjf8;u8n -a ull 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 voltp )+n9:m8ewxpmzfci fy.68ew 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 primary of a transformer causes 14 A to flow in the74( fd6ixv ft3dgxtg d3we:)g secondary. How many turns are in the secondgftx)4v:ggd ie33wx6df(7t dary?

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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 aw; uwzyk9zrpn (d1x 2 p2uj2o,re necessary in a 110-V primary if the 24-V sedw19w2 nkor j2(u2p z ;,xuzypcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary kgawa17knswb *jx ;sq3 5y.(ucoil and a 2000-turn secondary coil. If the current in the secondar5nwsbxk(y g . uq3;kw1 js7*aay 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 transformer. Assuming 100% effic7+fdy yb4 bzgey6sb)e 9+ooz(.g ao.hb+/bqdiency, how many amps at 24 V c/(g9+oy za+ ebd4ohb.sob +f.) bdz7 eyq6 ybgan flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 755ropey5(o253gd iom8 yu swv(00 V at 10.0 mA. The primary coil operates on 120 V. What des wyy5 5mo5p2(ou3 i8gorv (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 300 turns on its se:bo 3 6ziz7il uh:a+zpcondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prpu3 zio +6bz aiz:h7:lesent 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 caawmyg 9e, ba n5)a 7b6v96xiprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curran5 agye6x 9iwabav )7bm c69,ent 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 transformeragi0adfu9jm ex e+( d4r/b 2-a has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at thr9iaeu( xdaj4f /me+ab-02dge 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 secohr)q6uh(ye5 nndary has 200 turns. If the input voltage e rnhq)y u5(h6to the primary 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 trans0b sh(4--wrctlcul- hformer has 100 turns and its secondary has 200 turns. If the power inp(lw-c-0 uhhbt lcr-4sut to the primary 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 jiy/e /fyp7*x 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 resistance 1.0 W. F/px iyj/ye* f7ind 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 curre2kgt ltx:1s/jnt at 120 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. s21gxt t: jkl/ 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 Vlssvk 59v /u2x5di5j l. 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 percentage power lost in the transmission line if the voltage is not stepped u9iluvjvks /l 2xd555sp.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A 7cc)zxtw s4cvlq1 l6-generator produces 100 V a7lzs w4tvxl- c)6cqc1t 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 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 of 0.60 W. A genera3. jmfj9sb fcz6(dlc; tor 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 or. d(9ccs;f3z6bmlj jfiginal 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,zfp3auev8s3vn v 3s k7ngv- 1 down a 6-W line at 1000 V. How much less power would be lost if the pow3, us3knv7e vfvgnp8-s1z3vaer 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 a5coi o yg6)8)k .c:uxzp-zw bon a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power ly cbpzi) )zko.56uo- xag c:8woss 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 carries a current of 5.0 A. How much energy is storaqjjs u/epy/d9,hf;- ed in the coil's maq/j ed,f9puj/- hys a;gnetic 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 indufrbc3m sb :bg8 t)+j9sctor. What is this ci srj+t mb8)g3bf :cb9srcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit w; tlz8vb8gi5p here 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 outl o- y9m59od t m(idixcb4,9a1rxwmv)qet. 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 o(7c jsd,oh4bhwr 7-okf the lamphrw(4o -,sj bhc7d7 ko?

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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 1209 d yf:x;pj/zhh,:hujys 9r4r0ohxf/-V ac power supply. What is the peak current tyjxh hfr:fph9r ;s/4uzxy:0 d9j / o,hhrough 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 tzhc.(7qb s0k *q.nuz xo a 120-V ac power supply. What is the power dissipatu (7kqzq.b xs*. z0hcned 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 reer/er nvfe88 5ruy 5g9sistor 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 resistor 3pi77lxtqwo 3*zkjd7 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 resistorg.o-t:ok2ze 5vnzs)a-h ox 8g 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 inductor at df/bm;t f27n m:qy0tbr1ix + e60 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 ;dmvah w yxs8r3qfs2i6 or61/reactance of a 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 a 14.0-mH coil have 1elgs p2/6or:k 4.0 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 reactance poalvo .*v2e282u nvzat 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 60xc 8xl4(-zze .ev5dps -mH inductor when 120 V AC at a frequency of 20 kHz is applied t e 85xel p4zsdx.cvz(-o 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.xjj; /:m6mgac 50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at qgr-rnc1wkxfs99jhv x u 3*-wlq65y 210 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitivesp2xz2 ;td )rie 9* xnlcoyx nj8bk519 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 capacito3bhin/; frse6r 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 y(-*ad;nt9dobz6 lgeof a 0.010-mF capacitor be 100 We6n;zd*d-l byota(9g?

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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 capacitor 9l/8* dwymvf wsza 87lat 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 qixzh9uc1v) st1g.rz 2f wf:78qg4p6 ep8mpecircuit with 12.0 W resistance, 15.0 W inductive rept2spqzcg46.r)98hxz 81fu e f wgq1mpe7:viactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 207j nvc)q)x0 of-mH coil, and 1.0-mF capacitor are connected in series?qc)j)nv o7f0x

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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 i ye3k hm1my:ixl92-7iee /ytxx/wp r9 f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected m29xeh9xymr //k-py:37l y w te1eixi in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is *jwkrc7l s e//g(scv /*.vsczthe impedance at 1s /lwvk cec(v /7*cr.g zsj*s/000 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 inducto7aaz-h)tmuda)1q q (h r, what is the phza u)qht)aqmha 7d (-1ase angle 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 serb;, du2u7idb sd d6ex3f6 p,l5ckeh9ov8h5qv ies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W i,d5o6suhfd ed vlcvh;q5873kxeb692d p ,bu 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 nsld 2to-1l*c in series with a 100-W resistor and 15-mH coil to get a total impetl21ln c s-do*dance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH ind (qlk-bam+j0 iuctor at 5000 Hz for a total impedanj0 +-blkaqim (ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.did /ftue,3n5uj l0,p x w3d7b0-MHz for a total imeji7 0xn,fpdlw3 3d/,u bt du5pedance 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-/m.83cu;yjj udqg2 s d 5rl6vpmF capacitor. What is the impedance at 1000 Hzypd dcrsj53ulumj8 g2 6/ v;.q?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 k,ls ty7sjs8 6bHz for a total imjsy s6t8s,7lb pedance of 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 wi: yad*3srgi(jxk: b(dth a 10-mF capacitor at 1.0 kHz for a phase angle ofs:kr(d : gy3 ai(b*jdx $40^{\circ}$?

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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 ser q 3efuvzu9 8j.:7o; igl:ntq,fek/c gies with a 30-W resistor at 1.0 kHz for a total impedance of 45 W? qvk, fi:8o /j:nl 9ut.eu q;c3zfeg7g

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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( m18cxip n+9z;onv gf with a 100-mF capacitor at 120 Hz. What is the phase azx nmgp98+vo f 1i(;ncngle?

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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 resisto a 7nayacr(9.or, 20-mH coil, and 1.0-mF ca7rn o9y .aa(acpacitor 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 cons05qtba +90 69egvslxz xv2vr fists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-6 a9b xzt2x5gsvvl+q f0v er09H inductor. 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 capacitornx(/k2 tzak;i of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui(at ix/n2z; kkt?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50 bi 5xz0o2/m6yl*uubo-W resistor, a 10-mF capacitorybo0*uzx5i lb6 mou /2, 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 necessaz vzmn*9hv(5st .f 8sqry in series with a 500-W resistor for a phase angle of q(.hsvtn958*v zm s fz$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequen 2g97xupdtycp b6b 1 0jgtlc9/cy shou0u26 1 gxjlpt9pgtybc/bcd79ld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an acuvivn;- kxso 56lsv)1 series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V) ns1s; ixvk-v65l ouv 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 circui ve,ezw. bji,/7gt f4zt 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. Whatsa5xgu;n u:v 0 is the power f 5gu0un vs:a;xactor?

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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 g 6nca2 ynwq)tc2tp66a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?)qttc62g6n ywpa6nc 2

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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 ans13;0zbwludt d a 15-mH coil in series?s;w 0b tdzul31

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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 se. rhqx1vi4hw*a *69yk,7m 8oyk 3p5qbzp bwfbries with a 4.7-mF capacitor for a resonant frequency of.vmpr,ba4q7h8k w1 6w*bpkq3 by o9yfixz *5h 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 needed41 cf zh fytefzj(kkgq:3b1sz690j)q(ru r(m in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz?qfr1:s1)(ek 3gy(tzqjukc ff bjzrmz9 4(06h

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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-j 952fryc2 wniW resistor and a 40-mH coil if the resonant frequency of the circuitr9c2 nijf2 w5y is to be 1000 Hz?

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