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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    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 -0tig996 8utvi g,p(ctayepfare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states th(,edq+w6t vgmx))igtk) ick c1- fo:wat 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 wirqffb 9gi7o( z2e in a coil produces what kind of change on th7ff i 9zoq2(gbe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces what5j8z( 2.wyxaqr:q aus kind of change on the induqasr28z:u5 yx( . ajqwced $emf$, 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 whaaib8 7z *f2fqc+bg 8xvsy7z0x c;m*wd) gp7e dt kind of change on the indum pe7bx d7fbg ;zc*sq w8xfc)2yiva8*+zd0g7ced $emf$, 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 frnasngf7s (5 :0jqgfm ;om a magnetic 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 in nhyoc7.s:: /;wkuzfs duced current in a conductor will be that which tends to produce : /znwo:.s;7ck shfuy 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 ma 4h30m;s yi8s cw(uuwngnet is held above its center with its north poleuc(h mwsu;8i4n0 y3 ws 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 bar magnet is he *jpu3d0;qvlh ld above its center with its north pole pointing down, and released. As it approaches the coi0* p3v ;lhudjql, 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 vw+(pdx s1t,ewhxb l4lc-,b o7 3) znnkector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of h3 we 1,,lbox4lkb)dpw-(ct7sn+z nxthe induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level hgan q,7s1r, a2/jxjytable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stro axhj,ygnqj7r/ a1,2 snger. 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 ro. bxv/sraw .5egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induas. o.r 5w/bvxced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an e 5c7q-9whyl9fsh u/gover-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vi9h7l s9u fog5-ycq wh/ewed 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 xu/c;87/ vbbzzogg) ha loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be //gz u7x z)o gc;v8bhb(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 :l o da7;ftwo 2yrun.5speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced :nwtr2fo ldu;.ya5 o7$emf$ 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 b82+arinpaf6 5r sji8qk *vx 3constant angular speed about an axis whose direction can be varied. In aipk3j5vr fb8saniaxq68+* r2 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.7(f rhk6,cn(i+d.zlrg pg7a7f kd *ln
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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 thatz xh,0v3e63 f4s nczv6gzkin) 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 fqt );4*t;mpi.ixpk k0xo e e7eield. 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)d-x0:uxlfv oxr *; (r6retr1da2 w 1ua is moved northward at constant velocity through ax2u0drv(*:alr1r t6; u dfo wxe1- arx 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 velocity da(b1g7h07i wx (pi,kn1cwao$\omega$ 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 j( )s-wb:ps6px pcy)ftransforms

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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 throughv 6 10/ yyyo*vwou7c0pcvwdps4g w3* or-(sxm 60 revolutions each second. The frequency of thpwxw6y0oy30 woor- sy7( 41vgpc*m /v svuc*de $emf$ 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 devicethyqcfl7z pfd1 39o)/ 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 that/8scu u. n unujv-8dv-

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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 mo-ufk94q1;; mhml:levtj l8 bfre loops than the primary coil;f:bel1ul v 4k9hqm8fml tj;- 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 71,e qk sn9 b;t+b d4a,f vggay7zdz5uthe primary coil contains more loops than the secondary coil then it is aa4v ;, ,1fd 9gn7ksuyz eq ab+z75dbtg

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, therm;.vt sz8pip g,y/ j/ 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 cx kxk)-pf5uwr3tci t)v8.r r7ircuit,

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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;cz /gg.au 8yv6;im3ik d-zel an ideal battery of constant terminal voltage. At the m6zig/ml8cg akd ;ue.zvyi ;3 -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 series to an ideal batt5v/: b9;b; eze-sozs kf j5vgtery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is kvze ;:sg 5-f;z9bvo/5 esjbt

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to anolb(;6i5l: x)yjg w6c 5jwloa $emf$. 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 Rrkz5 +s+ bi2hs is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected inj17 2z. oyacu9rtp-3zlhmwf5d.u63fo.p a qx series to a battery. The time constant for the circuit represents j37whpfd q. p 3 a .2c9l1yuurz-o5tofzamx.6the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery1j qh*hs6j9nr . The battery is suddenly removed from the c9h*jn61sjq rhircuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the s 3ozf6j;jm.ry ame units 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. On k/f (;ku wgfuujnqz) 9o5y)y; 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 connect4/dqxi 2kl ;5rnxsq d/ d:hiu3t3qi 5ded to an AC power supply. In this circuit, the curren qxrxnl:2qkq5ui 34/ t i;ids/dh5d3dt

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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 a:2nrknwgguq /29t dd15grj5g+m he6mc circuit changes by what factor when the frequency isk29:u +51q m6 g /mdwg g5tg2njrenrhd 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:7 odq(wdo7 3jqh3 qww inductor is doubled, the inductive q qw(: owd hod3qwj377reactance of that 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 acr6o8io7p(x( m2a9etyuk t uzd 1oss an inductor approaches zero, the inductive reactance of th (7u m 8i9d6u1k2exztap ot(yoat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,qm(:nfco7t:nwcq 1: (s /wx ea the curren7q:s(xme/cnnww 1qo (:ca :tf t

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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 change pyn1x-e.)knqs by what factor when the frequency is trip knpeqx1.-) ynled?

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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 capacitoo:.d a(*n0cou8) qya4hqs s yzs/;nuor approaches zero, the capacitive reactanchu;sodoqc a0s 8:./un)y*ozasq4 y(ne 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 the inductor and capacitor in ajl lkz-0-h-i/;yi lf kmd ii 5b(z71ab RLC series circuit?bl -flzm ;-i i (1k5zhjykiad/i7- lb0

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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 vt2 -5cwd asgw u:)-hhis defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if /7jsi psf65wpR increases. When isip7spfw5 6 js/ this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Ti w6hb:p50xwh y( -/jfd stf jf)t7pb/he 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 c88ii;+ydn1e uiaeatv-gw b0( ircuit. 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 cl:ykob(u mnb, t*8ij(apacitance both double in an LRC series circuit, the resonant frequ(bon t*iubk8y m,: l(jency 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 circuinro+a.dx)t .q t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui: t*xxfg*9 rq cq)/h dprsg*g;+ftl5tt occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneti 8 4 4tg/yt(v4vj:p(zcogbb3gq:tcfl c field of 0.20 T. Find the magnetic flux through the lootft gtyvbo3 :g4czq j4((4vg:bp c/8l p when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i / 7pjx s;dgw(mmq(mn3n a uniform magnetic field of 0.20 T. Find the magnetin;7pdj (wm3m/ qx gsm(c 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 rotating in a uniform magnetic field of 0.2h; jqur7vsxk,zms9)szi* . 0 u0 T. Find the magnetic flux through the loop when the planevus) ,r iqjzs9;k7su zx*mh.0 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 ar,ydqf +dq0fgh 1v-t5/lyh ur9ea of an adjustable 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 changes fr-tb3tkst v;hoj)) q1mom $4.0 \times 10^{-5} \; Wb$ 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 anb*g6b-2op/tm f 5fdl square frame with sides 18 cm. A uniform magnetic fiel d*f-bntm 6bfgl 25op/d is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire 5 losk7(xfms. ym(i1na0mtg:with 15 turns 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 a.px +x/uzp4 jpt)se7ind 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 6e2r la bl;z ypw:sik ud7)i5r3r-p5e00 m flies horizontally at a location where the downward component of the Earth's magnetic fieldrs7p;u :ie b5y zkl rla)i-p0d2rwe5 3 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 :x5g iu 1)moz;fc h lv7pi7o6flong rotates at a constant angular velocity of 2.0 rad/s a5:lvoc ui 7)fgm f;p7h6izx 1obout 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 loops and a cross-sectional;zhk.p *.p:v-3bf2nl hrxq ae 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 die),d, 4bc ec/qr,5i)1bjqf4 esbz l wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on -t;;hlo4sb(y jxhpp+*7dl y dits armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loo;*7lb shp-thp4 xo;d yd (+lyjp 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 turns of wiptem 4e;c99 whre 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 12ctal /wgt/j/2yc*xa. V cc*/tw2. yaa/xlg /jtmaximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with avezfq( bm+v: nd( s0s yz,ece..6lhn- 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 resiscygrqj,4k2ps+89f zr:- 5yhzkg r5gdtance 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. The motor lbi+w9d:a,qry yv *77ikd +hk:dyf/u operates on 120 V AC, and when running at full speed it geneby7f+* d ly:v9y:7kdiak+ u/ r, dwqihrates 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 zkdw,o/ k(y7d .2tplt24-V power supply. The operating current is 1.0 A. What is the start-o7., /dktyzdkl w2t p(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 resistan-hs ple*ti0nt)6o*o hce 6.0 W is connected to a 24-V power supply. The operating curonop 0h*is -h6t*lte)rent 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 power sl)2z2rz g5-dn rpenp 4ho,e0kupply. The onzzg)r2p2p l0-ehnrd 4,5 okeperating 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 primaryxdyytar0 t(qdvwzd )j5q/742 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 transci:k(nlp 0vx+ (h*ux-b b+eznformer causes 14 A to flow in the secondary. How many turns arebhk* x(ive(:zxunp-+ n bc+l0 in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessa95r**r mee; 4s9hps2dj dxrb bry in a 110-V primary if the 24-V secondary has 100 turnsd5r*4 9x;rmdeejsr s9 bh2p b*?

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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 1 gbnwv(ev* w;a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pw vb*evw1;g n(rimary?

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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% effiqe);sv4s/ w+ ;khlvbzciency, how manyk; ;/ vzhlqw+)b4ves s amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer pr 6d4c 3vo2nkfhdte.+u ovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw3voh4k.cfuedn d 62+t?

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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 onm4ewl, :x)ixp its primary coil and 300 turns on its secondary coile4ip )l,wxx: m. If 120 V at 2.0 A is 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 primary coil h0q/ w1g*r5vpq jynx03zxry9 and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarj5v n0xrxr/qhgy0*zq3 y9p1 wy, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If qn:vmm(d0x :tthe input current at the primary is 100 A, we can expect the output current at the secodmm txn0( q::vndary 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 trans s7x x( qt.aj2nmc,lo;former has 100 turns and its secondary has 200 turns. If the inpum(l;sa .j27o ,q xxtnct voltage to 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 transformew -nx1o38n qbi8j5 zshr 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 (neglecting friix- obn8nhj83 1wq5szctional 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 volbxjj0( w5h zt(tage is usually stepped up tjthjw( x05(z bo 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a4xv8*j h6zzz xt 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. Find the percentage power lost xz8 z*64vzjxhin 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 12)ivx1n4 kmb,b 0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thrbk n)4x,b 1ivmough 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 resistance of 0.60 W. A0myaxlj)2 v 8g 8njj5s nktb,: generator produces 100 V at 70 A. In order to reduce energy loss due 8xba nkjygsl5jj8n,t0 :m2v)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 li6l agacy 31amr5t /-awne 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 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 tra-y5a13w g/l6mr tc aaansformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much-+jx)k()n/7hpqrmr .m o a) z n:dllfa less power would be lost if th:hno)xj mnaa l (rz7)q+r.ld )pf/ k-me power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 44/p9t78,;w3 qjodtproy g* ivr0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to ex ro8 dt*wp3 7gp t;qiryvjo,9/ceed 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. Hwibyq4)2 35jt 1uyijyow much energy is stored in the coil's mb )5yiu4 tiywj2y1j q3agnetic 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)ne lzoek9ha) v. m kv-6:9pppon2c9v an 18-H inductor. What is this circu9n9 )kez- vm2ppa9) :kco.o6e vlvnphit'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 where the rms voltage is 1205ge. vrs h(t99i han9uj0soj7 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 outletkzjeggn+q;hf 0 -mz6t mp:6e8 . What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lazxg0*lswpm 1n/1keu.q 80h qgmp?uq18wsk h. n0x0 elg1p/zm* gq

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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. Wyga h)v6+l 9w c)1cmokhat is the peak currenyavw+m 69 hcckg )1lo)t through 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 to a 120-V ajm0z/t4 hij.t l6fdj 1c power supply. What is the power dissipated6 1/jzmi.fjt dhtj0 4l 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 r ) c(zle*bf3rngx82ki 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 resc..lvux1ps y 5ba:m,b istor 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-u (uzqd/1cup 1W resistor 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 induc7c 6)fvwfs:4d4khu v gtor 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 r2s4 if;y6b v0sxm k3uieactance 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 14.0 W of inductive a+d u;k.qxwhbp + s,n)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 15 rm*kc 2 rshqzj98h4cik h/5v47 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 5x ,p 8jumpcg 2r+2ckaV AC at a frequency of 20 kHz is applied to icp u ,52kcgm 8+apr2xjt?

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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 source.k;qf1dl zv*3kwwf0)h g a nx,?

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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 gh a d+*5mbymr/ qv/l: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 W of capacitive redas4l 7y wxvp5w2(h-ractance 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 reactjqoy3 fy5 )0vpbi49hqpw jf00ance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF caph89fxy;hwlbx m-v( -oacitor be 100 W?lm ( yx-9xf8hwh-bo v;

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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 at 1000 H3rj3+meb5ajbutoi;* 3w9tuc;bmhm 9 z 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 il ky(-rpc+t 3nnductive reactance, and 10.0 W capacitive 3lnk rt+p y(c-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 hs t.5tfk+zv)pk 4fw. nxkf:*resistor, 20-mH coil, and 1.0-mFp5h+ : tv4tkzf*k f n)fws..kx 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 a 100-W respq8bzvgdu ,h2fgo3:ia )e+ a9 ,a2ir distor, 20-mH coil, and 1.0-mF capacitor are connected ina22 3 eb)ga9u, d:hpi+a zrvoq dif8,g 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 tqa6 ihegg bu*7-l/h0 bhe impedance at 100bhl0-ai7gq6ge b / *uh0 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 inductoojuh(;g m 0(ymavmpksp-g *-n4y8-tor, what is the phase angle at 1000 Hz*0gmy-oyn p;g8m -4-( mhatu vo (kjsp?

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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 s)6 tg i)exfv/ t+pub)jhk+/jm eries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance o uvgh/e6)m+ +x kjfipt))/jb tf 100 W 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 sn/jb 87 qyojv)eries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000)qo 78yjnj/bv 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 pfmsecd g+ m/*;ut in series with a 450-mH inductor at 5000 Hz for a total im/cmf +gsed;m *pedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fuurm 4lus-t;7 or a total impes4l- u;rutmu7 dance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the im35u96w,(lpwj h lm xmvpedance at 10pl3 m (w9mjhx65 wv,lu00 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 u58newow 2n e50kx3cd y4,emjin series with a 10-mF capacitor at 1.0 kHz for a total impu owjee4w,dnk58 cm03 y25nxeedance 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 with a-( ;pd n5ztkoz 10-mF capacitor at 1.0 kHz for a phase angle of(d-zpot5;n zk $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor avdykc t) kouep8h4 3xt21 su)(t 1.0 kHz for a total impedance of 45 W?1c3ty8u e )pohu x(k2s vtkd)4

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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. ge4qwp3i9tc c2n9jn- What is the phase anj2ig3-tc en4pnw9qc 9 gle?

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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, andbd dhpxc,b7;0o- / j..bze kaj 1.0-mF capaci/zoddjb .;- apecbb7x hk.,j0tor 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-gal/4/,gx *l 0*to blo ylx+)rx ba6tvW resistor, a 10.0-mF capacitor, and a 0.350-H inductorl,bg*/xg0xlxy + r 46 ba)ovl/lto*t a. 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 reactan2hzws)jtxpe gn 7dnw8v *)v a*+df7 p1ce 30 W, and an inductor of inductive reac zsad7p t* 18pd)fnw+h x)ev7*gw2n jvtance 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 circuybtxf* q+ e09pqfjf .;it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ijfq.p+x yf*tb; qe 09fnductor, 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 necessare,,jy k9e h2byd t,t;ky in series with a 500-W resistor for a phase angle ot ,ejktdkyy ;h2e,9, bf $40^{\circ}$ 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 frequyh4amml62jq q,*o0byel 1 y .+nyg k3yency should the circuit be driven in order to have maximum power transferred from the driving sourceo mq*0l +4ayqynm b.yy,ey2 h31jl6kg ?

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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 rni bxzu -2y 17noc*,eseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive r1e -z ycunox2*rn7 bi,eactance, 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 circui+pi tk,l de.ksb-*lf. t 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 imf4z(/bvzjsxn lu4 i5*b1 7 rqupedance of 60 W and a resistance of 30 W. What is the power fa(7b* /qus514jbvi lrn4uzfxzctor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resib(dlbc2.;f6g e/sa r jstor, a 10-mF capacitor, and a 0.45-H inductor, when connected tgb j;6( 2.delsr b/afco 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 frequencik;nib6/a0r4 qw obr /j6w+wpgb --tky of a 1.0-mF capacitor and a 15-mH coil in series?r iakt+4 ; /bi nbor6jw g--wb0/wqp6k

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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 serip, 8zhkr m2eex- 2aw-mes with a 4.7-mF capacitor for a resonant frequency of 10 k-h 8ak pe w2zex2-m,rmHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant o; q y7v,g ,pm0yvuc:zfrequency of 1000 Hz?yvopqcgum zv;0 y:7 ,,

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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 bexvst gs :(*dw9 p)p8bb placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 H)s v s xb*w:8p(g9pbtdz?

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