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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test80.html  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。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 magneticfo0m - cf.a..p(wxko ( gx+s khiw(fxmx/*:tp flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thw5cc4* bxoc (3ykxac 8 q85hube $emf$ 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 on tecgo s:*m no z1fb.d24he i * m.gfcb:1ondz42eso nduced $emf$, 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 loope i;aqbr;4:x x of wire produces what kind of change oq4b;e ;i xxa:rn the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on n,r*ln) to x)qthe induced lx,*t n)o)rnq$emf$, 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 fi ,f cu4zv7q 3i1anxwdiut 5/;teld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor cll 1ygy8mz5 6will be that which tendsclzyl5m8 g16y 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 1l-6yml((zylucja6 a4 4a3s* g 2z zsdgh nrr8on a horizontal table. A bar magnet is held above its center wi(rz6(hy4ma*zya c81r aj6 llsgdn-sz 4glu3 2th its north pole pointing 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 flat on a horizontal table. A bl lmf rp++h/xw694tuu ar magnet is held above its center with its north pole pointing down, and released. As it approachesflwhp9 +/urt +6m u4xl 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 i b /v9nosi7km-:9aqxthe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in th9vqsb7onax/-:k im 9iis coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the oz1el5;wgd*ie+y3fy/w67qpb i h- f fmagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fi -d f*/fy+efg5ihib wp wz ;ey1673olqeld 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 w1qco u vx;i-qz tnfme9zw55( 1here the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction ofq t 55xmi -cvnqz;fo1u9 wz1(e 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 carritj.z9dh4td k1es an ever-increasing current northwt9 .t1d hd4jzkard. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls throu1 71.yfmavcmfg ma220 u x(lnugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induce1avymn2mc1a.ff 7uu2 g 0(xl md 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 about an apb myh5)rn,l 4bv3*i pxis whose direction can be varied. In a regi rpvyiplb m5*h)n,4b3on where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular s2c7 ,(6w w4 6qi io e7ag/npqefk*xynnpeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha n p/(eqn 6xqwag,77e26n ifowk4icy*t 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.gby*9.cbi s ;u
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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 anzb*:a t k3cyh( $emf$ 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 magneticv9pzm h9 +h3hak8v/vh field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction)fsoy h (qal,pg:l+h2aqbu): x8p vi;5 is moved northward at constant velagpof:u)yv+5p8( h2 ql,xlqshiba :;ocity 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 barozx8oy7+ 0u e0gqgd3b rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tra.x6yc :xcb;-v2.(pmhbfj bq tnsforms

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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 second. The fre)y+(m p q0-aowy0q8 zp61kwcua plk t0quency of the mw60c0wak(tzq 018qu y+)ol pppyk-a $emf$ 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 dzt3mbul 3 g3mwdhr. 0e4h* hy5evice 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 thaxsxe-yt2m6l 6-tl ;lrt

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifjq 7(4wqa4 d9bp6y+acyn bx)a the secondary coil contains more loops than the primary coil thenaaxpja+(qb)q 4 y yd479 wnc6b 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 *dn7zi0kdnwfd6( oxz-pb 43 d1c rew4secondary coil the n o( c3p-fz7 z1bre4w4wd6nkx0didd *n 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 p*solug)t b *3zj2d s,/q0dnleower 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 resonantk(2t y8 1 cxnunj1rvrzln4o13 circuit,

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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 battery ofz7v0.a nh+gix constant termina xg0v+i7 .znhal 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 an iltqt;1k-/2w g lzzvn t (ppuh.s0, 8gndeal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor1t/zlqp,-u vp 8t(tn n0ghk. g;lws2z 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 wipb -u 6wsae izv8srk68*4i5irf,u ;e zth inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tons 2+jmjva q7 ,.qeyl+ 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 pd q1xd c9ufe3jd(j-b+he ;y)a battery. The time constant for the circuit represents the time required for the current to rea u-f;jcjd3q(pbe 1d9dyxe)+ hch

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The b ptu0; saj.iz0brx0b1 attery is suddenly removed from the circuit. The time constant for of the circuit represents th.jsu1 birb; 0 za0x0pte 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 excepwbf t 8: vy5.wljm4e4pt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connec.s.)qbvhta*c ted to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is cons6 wdp:)l;jrs nected to an AC power supply. In this circuit, the currentl)wd 6p ;j:srs

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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 cir mj+/fznivynh;(w:5x4m 04wggi aa/jcuit changes by what factor when the frequency i4a4i/(0va5xmnzjmwf;i hg/:wj n g +ys 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 inducx wzp3ci3qfxbg1( l.. tive reactance of f3 (x.pwil3g xq.1bzcthat 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 indb7o* *7 bjpgakex/ m-3zus bw5uctor approaches zero, the inductive reactam b7-/x3*wboug7ke*bjsa 5 pz nce 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 co/qhu60yb )(tvff g8rnnnected to an AC power supply. In this circuit, the curreq0rgy/t86fhn vf u)b(nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frequl 4x g;6hv5jsjhxq7 -iency is trix7q ; sx-jlg5hj4ih v6pled?

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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 captrjzaeti/.)b 2fn.b 7 acitor approaches zero, the capacitivej bt7ri2t/fe a ).zb.n 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 voltages of tha ++*qnwdl+lf2w bu j*e inductor and capacitor in a awnujl ++*qbdwl+2f* RLC 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 RLC circuit is defined as :)hdk 7gx drko9sdu+6$\cos M = R/Z$, 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 r /xu-vx,h nrwwyaf-.rb7c/4 the circuit increases if R increases. When is thiww ru n/4v. /f-,x7- xcrrhabys statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases imrp:uce h-3v*f $X_L$ 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. Tdek6wyujqcl7q 4a9 cq s) +r44he 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 both1a ge84tlrlyjtd*; 2o double in an LRC series circuit, the resonant freque d*ry1t;2elao tj48g lncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltagj+oq cb ,o:nrbk -om8-/-hhgk e. 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 circui1cgy 6:mei/ml9es(qk c z* h+jt 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 fielyqg:n+ltw :3x8w bz 1pd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic +wnw1gpzb 8l:yqtx:3 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 ra*da*1xsbo ) p zkn*j q:+pd9qbdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Fin 9*abnox*:*zkdqp+1) djbpq sd the magnetic flux through the loop when the plane of the loop and 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 is rotatfwy 2j2e4o95x1z5 cotbyrm v,ing in a uniform magnetic field of 0.20 T. Find the magneti w45xy,toz bv 5foy91cer 2m2jc flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjusta u650 9lgqbkul(a qb5xyx1t*rble single 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 changesgfh/ jkpx8oc: w+aok+.6icg4 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 turnpa2tq/;suw (dovk*;3- jqvyw s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the co2a-3kt ;;/ wd*suyq v(p vwojqil. 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 a(nqxvqzf , ):-b4* ewkp- 7ypkf by9ytn 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 ohlf3* +ktdk9 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatioqq4l wlc c1z5*n where the downward cl5c4wlqcz1 *qomponent 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 that is 2.0 m long rotates at a cons7n0-em. d3tm ge0rjnotant angular velocity of 2.0 rad/s aboo0n70gd3njtm - . rmeeut 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 ;e*wk ajct q+8pm ,k ziirx;)050 loops 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 wire of are/pz6 ph)buw y u) *ssrqmx35f*a $0.090 \; m^{2}$ 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 loooaj+ n:oxsi 6;p 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 rotatea: i +6oxs;ojns 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 1g9bj+x4144d wwho: chxl6 td o00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a sih 2msd sd1(yxbkm9 (*qmple 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 rotating cdh kb *(xmmds 1q29y(soil 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 gel q0vfn3r ke)(nerator 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.jofw99k *i/lu 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 xucn794 .rn-xdvj :+hefqz- ghp. 0h mof 6.00 W. The motor operates on 120 V AC, -.-0e hdc .nx4phq zfrh7x+jn9 :mu vgand when 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 connected to a 24-V jtmey.08f x qhr8gz 7.power supply. The operating curreng me.tf0z7qry8x. h8j t 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 internehk9+:css -sm al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A9:s- kessc+ hm 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 internali8ew15xyxgp83-m8/k d afa g*:ry nduq(u/f f resistance 6.0 W is connected to a 24-V power supply. The operating currenw* pf1ua:-xf8u3rd/f gndk /a8xy5qge my8i(t 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 6 um6kc* eq ltgkbda77kj -4,pneeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the se xykh:ph/1:4mdpg - 7oejl7muo( kwh7condary. How many turns are in the sg o ko(m4: l1m-yx 7:ewuhph77jd/khpecondary?

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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 t qh3xjt 3rwyxs1*z0 iud6id60*7fsdtnt .(bk urns are necessary in a 110-V primary if the 24-V secon*dyw(std t ih13 3r*jd 6ufsxb0z6.txin 07kqdary 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 ofav 6epl0/b yv8 a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what i8vp/bl ye0 va6s 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 transformlw)vx c n8x9y(er. Assuming 100% efficiency, how many amps at 24 V can flowvw)9(lcn y8 xx in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V a xxvgj2tb.)8gdt x-f *j9whj9 t 10.0 mA. The primary coil operatest xjv2gj8xw9bj9h *).xdtfg- 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 its35miclt;v y 0 g-uq/cs primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A s /q c -c5;vt0i3lmguyis applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prima p26-gsjpt7ln9oz z c3ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prese jzzo3 -l9sgc6 72ntppnt in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tjo em m*cj3(ym h6)m6m/g +pmlurns. If the input current at the primary is 100m)y c m *6jge 6plm(/m+ojmh3m A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu,egs n)wd5+.+ggxtm prns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of t)s t+gxd, en5. wpg+gmhe 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 tradal pmky51 /j.*fxjxz ybe51. nsformer has 100 turns 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 (neglecti ye. ya k*blzpfdx1j.m /x5j51ng frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualakmw .srki6( ( - nco(y0*vxwbly stepped up to 4500 V by a transformer and transmitted through a power line of total resiswm vw (xo.60asn k-*rciy b(k(tance 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 currenx* uv0sea6 7ez+ec c*zt at 120 V. The voltage is usually stepped up toe6as*ux vec +7zze0c* 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.

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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 voltage is usually 8)b-jfgu5/mmy us ql6stepped up to 4500 V by a transform uj)sugm l/q-f685 ybmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resifv j9gw,r hx.-det:d6- gzu 0lstance 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. ldh-jw -egdf,0: gxu .9vtr6z 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 geneg(s4ekcao//h. f sh a0rator 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 o(s0ehk.a4 cs f/a/gh transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 Vgvo3; tjpn92mid j4yl.c9 p7xupe22k. How much less power would be lost if the power were232;lgnpc 2v .9k topj9 xeyumpj7 id4 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 transm2 xog9fq+o-xo i7u3 wvitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powe9g3qu- o27f w+vxixoor loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries v5/txid j ynoz+vr it4w)96 p/a current of 5.0 A. How much energy is stored in the coil's magnetic fp)i/t6 o5jy rt zdiv+vn49 /xwield?

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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 conq ej/, pxyb*v4s fw ..h*dkd3rtains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constr*3k/b,xejfdd yv. h*pq w4.sant?

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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 7t2y6en h jc/ (;:ghsmqkta,s in an AC circuit where 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 Ai rf(gm.:iq98l 3c:b5pyfx in C 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. What is the resistance oo i9a/m(rf e.wr99 ) i+d7htmvryd ek,f the lai, (rw7a9 t/.r9ymdkr9i )e vm ehodf+mp?

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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 aceo8c (,0 t9yo7zwnlcf power supply. What is the peak current through the resistoro0ncw 98elotcy7,z( f?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 12h fpw4z6s) +rf0-V ac power supply. What is the power dissipated in the 6 zhfw)s+r4 pfresistor?

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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 ri)d:mw0gajai lu7d/sj lu.. 0 esistor 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 resistom( cbypg- i1wl lkr l85d hh6xf*,20eor 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 resist8onv b.r p *;u7ry:c6q/wcwxwor 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 indu b9 pk01;74y:ac 2wsuecwok* ucvd 9xrctor 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 ly4j1y c8w*sb:j: wrg 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 14.p 5-3lex:avt j bci-1os6 ksi(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 necpj)p chx) p+;b6o)q36o1wt3r/a h xky 2ftdwlessary 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 0du.fee u*f*z60-mH inductor when 120 V AC at a frequency of 20 kHz is appl0.e*dff *uzue ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sui pztariiamf . v/jv:r;;po 6r3(8, rource?

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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 sdk x w fd:t-n*5n s,j,an9uxf8z/p/fa 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 haaf:x1 sq ,jxfvk 77 iwamx fed.8m-x;2ve 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 a reacd77clr3n :ebntance 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 reac7e h0xn8iu l t75njhz*tance of a 0.010-mF capacitor be 100 W?5 lij he7xz *0thnu8n7

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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 throut)8nf3o zx7 gvgh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1dueqzjxe:+ kp fagj+9: 3cld:q- s1r;5.0 W indu+jqd jrld+ez:u x:kf:cp - s;egqa93 1ctive reactance, 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 Hfs y l1 c- +.2om/rxlk3gxu.mlz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneg c .s21l3fxrlymoxk/ml+ u.- cted 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 1500js ,f-p y1g/gop- 7tzg Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conjg- s/f 1op7pz-,y tggnected 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 seah rraz7(j 4gx.f4iwg+iq*f ) ries with a 20-mH inductor, what is the impedance at 14qairzg r7gw(x* )haf4i+j. f000 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 9/my fgnycmpy82v b 0f k lo8j-j+9 v)tapv*q-is connected in series with a 20-mH inductor, what is the phase angleqf) fmjpajp* 2l-vntcmv 0ygvk-y9/o 9 +8by8 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 needen9bp9 c. o5grmd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 mcon9pr9b5. g 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 capacitnxr d752jt us(ances is needed in series with a 100-W resistor and 15-mH coil to get a total 2t5d xj7 urns(impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series .4h6vfw n(xyxa1l q.r with a 450-mH inductor at 5000 Hz for a total imx.4n1 v.x(6yfraq h lwpedance 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 resistoa ;rdph2 ),d u(fjuxhpfg7( 0kr at 1.0-MHz for a total impedance of 150 0fpd uj7gf dx h(k,)h2ur;pa(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 capacitf jr(ogp+0c2b3d8 giz or. What is the impedance at 1000 Hz?3djbo2rz 8(cf+g0gpi

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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 kHz for aqy,4hqj6sq 0 e total impedayjs0 6,4qe qhqnce 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 i0r hzmbyv 9s0;n series with a 10-mF capacitor at 1.0 kHz for a phase angle of y; hvb9zr s00m$40^{\circ}$?

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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 ( gdnx8+1omhwin series with a 30-W resistor at 1.0 kHz for a total impedax(dhm+ 1gwon8nce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phe5(2;erh an0 u 2.jk mdlhgl3dase angl.guh ;5 m(2 j3hlr2ad0lnedkee?

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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, and 1.06zw //5j g3xtu phm0-1hiwchg-mF cc- 5hh0gh6mj1g/ux iw 3 w/tpzapacitor 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- * nncvbuu8tqwof1.mdx pv*:z1(ea 31mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz f13u : owv*8qbc1pzn(1t axvn .m*uedpower 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, ane0p9 fq; zau/od an inductor of inductiv ao/pe;zfq09 ue reactance 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 fo:ers:g fnjs9 8r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-jsn:9 8e:rgsfHz 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 seg xwp/,sy-: 0lak0ol qries with a 500-W resistor for a phase angle o:qg0,ypaw-okll/ s0x f $40^{\circ}$ 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 frequenx 7 -2ohb2*g/9wjlx nvc62qjf 1dknykcy should the circuit be driven in order to have maximum power transferred from the driving sour7j ngo 1f6nkb v/9c*xhw- yjd 2q22lkxce?

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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 ins2 j)6;)2 t dgm yf(npxt4*df(owlxwx an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is gno d x*(yw) d2(jspf;f )wx6tt42m lxconnected 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 circuit-i ox7b:slli 4 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 an rfnn 7s5dw-8fsg7z /gd a resistance of 30 W. What is the powsd8 f7z n7g-5wf/ngsr er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit cvs/fo qp 0).dkvijg (9ontaining a 50-W resistor, a 10-mF capacitvq)dp.o 0/v ( jks9figor, 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 frequenmz , u/-fqy5r5hreq(*ma(czq cy of a 1.0-mF capacitor and a 15-mH coil in series? /ry,mf-z ( 5ah qmq5eczu*rq(

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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 ser .bgmbts*b7ze .z 6xl,ies with a 4.7-mF capacitor for a resonant frequencyg6el.7 b,*.tzxbmsb z 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 wit9q97e s+1.gnupime v.hcrj . jh a 3.7-mH inductor for a resonant frequency of c79 jh91nq vmrje ge...psi+u1000 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 p5;k)utvli 2w placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of t5i v;lutpk 2)whe circuit is to be 1000 Hz?

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