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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 are units of magneticdvuw vee 270qyu 9i7n7 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 statgf*:d(dy dv7 kes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in x 9zio6 e f4o68r-htosa coil produces what kind of change on the induc 9ox8 rotf oi-he6s4z6ed $emf$, 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 magnetbz5/mr0yc,o5 ot( tk2xa(vg j zu5s )gic field through a loop of wire produces what kind of changezkbt5 2(zmx cory0a,v5)go tsg(j u /5 on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change osc sjz,.dwv p z)k./9d)-rx xdn the induj.x)9xpczv/.k wzsrd )-dsd ,ced $emf$, 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 ma)549gka :p v9d7fhxfr;i u ofygnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced exks6ibg. -i8current in a conductor will be that which tendssiei -k8.x g6b to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on 67wl e)za 1.0eaox gcta horizontal table. A bar magnet is held above its center with its north pole pointing down zg ocw.a1 x76t)0laee. 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 hocqil nx;: /p 69ei8 juir1y.glrizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approacl .9e lcx8;6/uj :grpi1in qyihes 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 j . dd()pej(n-bt*ozptable top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed ot.d nzb(p(j*pj -e )dfrom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magd tu4pl smakyr1k3;0e5ix//r netic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current i40pikda1;/5 txer3m / ku lsyrn this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fiefvfzq:kzj3 16t 4n :mfxlo o)*ld points straight down. The magnetic field qo6on3x vf1 ml4zfjf*:)k:tzdisappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a hokqf:bn; 0gba i1qe+(f(mi p0grizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currenmfq1b i; epg 0+fbaqkg(ni (:0t 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 y(1xs pv88 b+ pthke*rnorth pole entering first. As tsveht18 b( 8k*p+r xpyhe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ;bdi t ek:c3c e6o6j2qabout 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 lo;d q63eekbt6ioccj 2:op'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 angula(bbd0l.ppe9rao:0zty 6b 1j hkvo)-mr speed 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 lol1pj 0e-vt9r)( 6 :bap hdmbz0ok .yobop'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.r29 1x o+5ppd7q+wu;imq zbpd
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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 j 2vx8ax.t-tk 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 magneti ma1sr) 0((aban2 : 4u( apqzuyto0atzc 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) id-: x5ijkdt7p w3vba6s moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the ro3 5ti pavbjddk-:x 6w7d.

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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 nsf4c)y p9xmvfb:ty0 88l w2na 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 transfglj7y,f6x3czm0 p *bm -ctc/p orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat4hufr, s93 oq um1fr.t6bk3opes through 60 revolutions each second. The frequency of thes.fqhofrk 9m13 o46uurb,3t p $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device y.w; ,ryg9snjused 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 devsl zh5-8 omm idkc.2r8ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more ly/:nipalv: t 57iuv: boops than the primary coiit:y/ i::7v5bulpan vl 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 secondarf:3b*4 +y e7r+m2gjn w 9 tfzv,l eh,fqeswh9xy coil then it+7,y hv3 wee9+xzhl,e:fnm29tsgr w* fjqf 4b 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, thjv u4g y0tgka7/ss7kzk) .*lmo6jyuxge u6.*e 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 circu/l;,x zjp3/ jrlf2-su hin (vcit,

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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 gw 5d+(l.bri1cssex s gta/t ./gep+:to an ideal battery of constant terminal voltag bp tgsgsc5 l(ed+g. ts/rx:a.e+iw /1e. 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 ;05pwgg8xnqn)7mged6ffww 3 an ideal battery of constant terminal voltage. At the moment contacfgx76gf 8)g 3 wq;we0 nmwd5pnt is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R isi8xxgzkcis4u (+d o z8 *:zgun8n3r b3 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 t vakt zne+6(( c(*scs,0jwvhuo 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 tb sbnd u*s(,)ecu; h*:tglal .o a battery. The time constant for the circuit repsgn*c *bul)ulh:a stb, (.;edresents the 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 batteo2iz-rs a a hd,48p7;(fg4ydbb .jivery. The battery is suddenly removed from the circuit. The time constant g7edb z -v,(oaa;4fibr h8dy.42ip sjfor of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exeh/stslonv8d 8y2p qa74dm0a:7u v) ucept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curvi29yee6 2, oq9cc uxprent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In thi0:y jcv; fyhz w*ok*oq2p-gb +s circuit, the current*w+fzqykvj*;c h2po o 0: bgy-

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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 c s1zskim;xillh-r:.5 (v* b rgircuit changes by what factor when the frequenzimi.g:h r;*l (lvb-1r 5 kssxcy 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 ip6lmpzyz9*m+5qn/sb( ca;ko nductor is doubled, the inductive reactance of that inducta9 czm5nmz6k */ sybp(l+qp ;oor

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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 inductor awx9as nggt+om6) jr25pproaches zero, the inductive reactanao5n6m ) j9t2xg+wrsgce 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. In this circup6c lta bd2h.jdp/2c;*wfz l5it, the currenah2*6pz b5 l2 /pj;dlwfdc.ctt

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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 bnha.j-i 3 01kav ay/:1pdidlwy what factor when the frequency is triplv-/ 0lw a.d yaainjk1pd3 1ih:ed?

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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 acro.fgcb7q l 6i3ess a capacitor approaches zero, the capacitive reactance of that capi3bfc67ql.eg acitor

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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 cake8 lc(vse3nnk991 l xpacitor in a RLC series ci ensv9 kln8l x1ke3(9crcuit?

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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 cisx;ju 4x f,e8g6im0 porcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the c m0*os1uxu(qx2 rq -txircuit increases if R increases. When is this0 ( *tq sx-r1qmxxuuo2 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 cirxm: k4z w6hq i8e8*u w9kma:qecuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of thch 0 c88q 7edehxsar,8u5qis1e 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 capaci1pi/kl5.to/px hk 3m jtance both double in an LRC series circuit, the reson thkojp3i1kl5 .m/ p/xant frequency 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 at8csktzc)*du-y)x x0pplied 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 d le,;pdsqzj jg0i4p,1xg )q3c1x phg jh3j7/circuit 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 field o)ob y4vsnlh ,6f 0.20 T. Find the magneti4y)v6o nsbh,lc flux through the loop 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 in a uniform magnetic fielsi2yh )t2; 6nxbzp2 kkd of 0.20 T. Find the magnetic flux thr;b2t2i pyx n)k6 kz2shough 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 magnet+8yy8 zb-akd0t/ly gtgw* +yj ic field of 0.20 T. Find the myy/+b8ywtl 8 *dgz-a0 j+tgkyagnetic 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 adjustable single lofq4i; ovm.n4suz, fk-op 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 changos0 nd+8vbh6 ges 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 turns of wire on a s k/+,g-z (nr q4q5c/,vyupz yxrfgj,p quare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to thf(xgnrkvc/ g, / q z, zyu4j5ypp-,q+re plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area hab );o.x;dsen51om ( v0znxnof $0.40 \; m^{2}$ 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 atf)spb qpgq)3 5+ir dp. p y)gio,39kcrea $0.20 \; m^{2}$ 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 6:zdvco ,e0i+b0 m flies horizontally at a location where the downward component of the Earzce0+dv o:i,bth'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 constant 12r li3(2ytdb*xitrz angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fieldd yt rxb13ziit 2rl(*2 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 )p 0 ms+ kate+lu;dl)barea 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 100g4hn ): gdv(bcz83kzn turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm laztznu iaq/9:t a7n b3 jx)k/8ong 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 ofxn: /t9au 8ai/bz3 )q7zantj k 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 wp1j /ejny0t;lire 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 gener 3tu9 ft5elnv3ator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availabl9ut5 v nft3l3ee. 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 generatoe( l15y(dl ows9*skcfr with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Thpu dpb,vimiyek(77h8vru :pb n(,14te 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 ofxt* nsrgrqr nf9 4 -mdxd41.g6 6.00 W. The motor operates on 120 V AC,tn *x1xrg . dfmrdqgr64- n4s9 and 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 connectede1yhac:ubsq.w l -u*(i.n drz 6ocy(5 to a 24-V power supply. The operating current is 1.0 A. Wh-c (cw5:au61oe ydqu*s (lb.inhryz .at is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W ,wi1(hmt w *j4xsblwo.8.fyk is connected to a 24-V power supply. The operating current is 1.0 A at (ox1,4tw ikhwfb.lj 8w.*s ym 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 conneg0i0wr7z q08 /c9qie 4bnskro cted to a 24-V power supply. The operati8 0nkcw0o ziq/gr i4q09se7br ng 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 nc,vk;f ;e9)dlcnlo x aq+uxd2 zgpw7 7bub*3*eeded 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 p/tcazxcmhdb,(x c 06; rimary of a transformer causes 14 A to flow in the secondary. 0mc6/c;cbzthdx a, (x How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if thyc2 yskd, 0r)4 7.uykwhm sp+hbx; dz(e 24-V secondary has 100 turnbus mzk;2 +yk47, 0d)(psy rwc ydh.hxs?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-tups56 )x eibn)blf 7.qprn secondary coil. Ife)5bp 7fiqx.bns6p l) the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transform,xlw3 .q9 bp 7jgbi7k*u+ nkdyer. Assuming 100% efficiency, how many amps at 24djn i *qb9b7ug+w7y.x3 p,lkk 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 provides 7e a i15n)nja;v500 V at 10.0 mA. The primary coil operates on 120 V. Whatja)an5iv;e1 n 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 cgs yxsu* ef vea)+m5rs+ y25o3oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vs s25*g53sum ++ xee foyary)voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secu5mz m- hs.3gk4i3exqondary coil. If 120 V at 2ms3igk3hz .-q5m ux4e .0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has .2x4e ww- p1k++ilzcs lppy7z200 turns. If the input current at the primary is 100 A, we can expeeskwpp1x -ip.l74wl + zy +c2zct 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 turns and its secondary has 200 turns. I4uj7oi zz/3r,z8 7ip:indo paf the input voltage to the primary is 100 V, we can expzj:8i,i rdn74z p7oi /opua3 zect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 t a idq/p1yeg,zl7b- j(x (ku7 87a7nip/l hdhyurns. If the power input to the primary is ll 1,a8i jbd-di /(ypkn g7/777hxheq(ay pzu 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 60 A of current at 120 V. The y:p8n;.clb:+pl6 ;;t4prij tpbuqu l 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 number of turb. u+p;:l;lc6; pq uy rtpbt4: jnpl8ins in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppez31heu x6tz p;d up to 4500 V by a trax6 ;3etu phzz1nsformer 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 ofkxdj/r579:g;b n qv vh current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resvgq;vnh /k7r:9b dx 5jistance 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 lon g6 (7ifpmm2whcrx 8x/vic8 x+g has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In orderx6 cmg p8x(7w8mfcx+i2rv hi/ 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 0.60u*i9.oa h2s2wqgdv8zy g,h b. W. A generator produces 100 V at 70 A. In order to reduce energy lv b ,gd *qyhiwz.aug9oh2 .82soss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less pn;fsa f.,xnbec2 o29iower would be lost if the power were transmitted at 3000 V instead of at 1000 xbce;2 f.a o,n2nsf 9iV?

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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 transmitt v;mh( gpbn0aw7* jz;m2c7js wed 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 s 0w h7a2vjgznwmj7bp( ;c;*mtransmission 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 e2,5xqrqx8lgstored in the coil's magnetic fielde5lx rq8 gq2x,?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. mueh*t 5l(qm2 c4p3z oi/k1 *x*mzuut What is this circuit's time z2op / e3*mu4mm it*ht(q u5c1zlk*xuconstant?

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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 l ce:nzt74y4e1 lba; nAC 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(m4mjjv: z,a0iu m/e x into a 120-V AC 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 wms9t) iu6o5p 120-V AC outlet. What is the resistance of the lamp?t6o mup5)i 9sw

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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 sif1e4r+fw 9 (vdrxn; qp6 *bsmop*m4 eupply. What is the peak current through the resistor?rd(*qs4 4r1w;b*ox+9vn fe mpmef p6i

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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 120virv 360g l6qm-V ac power supply. What is the power dissipated in the res6 vm3qi0vgrl 6istor?

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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 50esz38i nk*) p.tqs a/u-W resistor 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 5 d8laembk8(a) 0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5+c9p vy;t.*2d3e yc it z3nmzq33lj hu0-W 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 inductor at 60 Hz?wc 5v 3 bi3zc2/o g2tlaoai) ps28+hsv

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atx ci6jmk o6k*t h9:9np 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 rea*dhcwfge4jqr 5+*2 orctance?

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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 reagpknj7qx/2xz9qf )9/+ ec5ypstd n, lctance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 n(bowh /:g)2p c 4uulukHz is appnwo4cupg: ()hl2u/u blied 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 1pb, wwxd2lot6jh2v8 )gq/ v. n10-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 capacico3 xdjx nw(o)0ztawi8h(/ 3etor 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 reactance at :u;:/-6 sv2wsutidk-o8psi hk.gn u k, jdg2w 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 r4da pfz+e (:qbeactance 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 reactapi oy2 go3c3 *vccr3o2h qm2pr9x. 2jlnce of a 0.010-mF capacitor be 100 Wj* 9vc rm23lrop 2ho23 oc2q.xp3gyic?

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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 0.0010ts0fx, u(dpzfso+g2.-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, 15.0 W i6.zqj jm)x esc2h-e nfn.h1x.nductive reactah6)eez m1h-c..xfxn .jq2jnsnce, 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 1,4sv96r zao/q: ispx z500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mzq6 ra/4z 9v:xpsiso ,F 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 resistormco)h uv)4o, b(+irw 7:onr 3n0maxg e, 20-mH coil, and 1.0-mF capacitor are connecte mo:o x 7rib aen,nv0hm4 )r+o3)cwg(ud 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 pkfqird;64pqhi8 nh z;z0,k4 the imped z;i4ih n8p6;kfq ,h40qdrkpz ance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-/s2h2gne*p mmmH inductor, what is the phase angle at 1000 H2me 2/h* mgpnsz?

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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 series c3k7wq x3 bna;m x;/w:okpv+pbircuit with a 20-mH coil and 1.0-mF capacito k;;q+xp3mo k:7 xpv ab/n3wwbr for a total impedance of 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 capabm88lbi *e4h(q o l,oaf0u;lhcitances is needed in series with a 100-W resistor anda0*h4 ufq(lo8blh,b8m;i oel 15-mH coil to get a total 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 punm 7cpnz31us,t in series with a 450-mH inductor at 5000 Hz for a total impedance 3nc 1zpsnum7,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 serim5g4eu cbwz 0 6nk8ty5es with a 100-kW resistor at 1.0-MHz for a total impedance of mbg4y 5kz0 5tw6c8n eu150 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. Whad oqjz; n*ce: -7:4ntgqa+mozt is the impedance at 1000 :c ;oo:da*q+q-4 7j ezmz ntngHz?

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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 a tota4;zyewynn,wa+i4 rh 0*3d alpl impedance of 45 W+;ra,*wela4y3d4 y z ih nw0np?

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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:ng8r ksu +.focm5qw7 cuty28 10-mF capacitor at 1.0 kHz for a phase f u+guc.qyk82n t5r:wmc 7o8sangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor ;)+t4p cqd(xaal 8lvyat 1.0 kHz for a total impedance o4acda lv p )x;tq(8ly+f 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.wt4 q dlym-9,c What is the phase an,q9 tl -dc4wymgle?

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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 +t6ic7(gp96em fd :x2 cbdqila 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connm6db i:7tp2d(g cxqli+6e9c f ected 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 azm4qcm8q73o aozi/nj -kj(9m ae l 7h3 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curreo h m3li94 jea73jk(zzqqom/c nm87a-nt 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, aq(x.yo2wfg,4 vrfrw* nd an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curr yv,x2wqf4ro .frw(g*ent 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 s7;b e wakq)0gc; jj)cgeries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.4wce; j7c0qk);j bgga)5-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angleg z y(tf*vao;sseo7 q3 5ezr6: of s*z o r7v3f6goqee:z;5ta (sy $40^{\circ}$ 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, Cfrg2* 0b.k)1 dbz:lh l4sewu k = 10.0 mF. At what frequency should the circuit be hkw b 04 .k*b)2urls:zgedl1fdriven 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 outp1 jc/ ) b;qh6x1xtyrxtut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is co xjb1y ;xr) thtcx6q1/nnected 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 6eyyb;7c*juerki .v5s $63^{\circ}$. 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 impe iw ns2n83y9bcdance of 60 W and a resistance of 30 W. What is the pnys9 i8n3bw2cower 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 fact 7hzint;a 8w.lor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyi;8 hwz lna7t.?

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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 ofmyhu,):x0.:bn cnd q t a 1.0-mF capacitor and a 15-mH coil in series?)n,:yc: n mhq0d.b xtu

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant qj c1knol+2f q b1f5.ffrequency of 10 kHc12+q 5ff nk1bfjlq .oz?

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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 serieg:sk90jqer 5g9vg /hws with a 3.7-mH inductor for a resonant frequency of v9:h0rg s9q/gj5gkw e1000 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 ca :o.*iso ,kmplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of thec,k.sioo * a:m circuit is to be 1000 Hz?

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