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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 magnetihdg-3 m :z(kccc 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 inductionlrex:njs;k/ - ro8p 8h states 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 loopsxsu7-f sk 4.fi of wire in a coil produces what kind of change on the inducu7.if-x4fk ssed $emf$, 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 magnet ,o8wok- ap3 ab:g(ym6odiew*he ,q.yic field through a loop of wire produces what kind of change oem kop o6(y,ow*q.y:-wd,eb 8ah3g ian 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 chang06vh-- vctl mwe on the indu tcvwm vl-06h-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 magnetic 1+mac4 ek59,(ytnlf d ushiv ;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 current7 zf* xoih( (8neqpg*a in a conductor will be that which tends to produce w7*(h8xzfpeniq o(a*g hich 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 tablein y9+ex ,rd2e. A bar magnet is held above its center with its north pole pointing down. The stan yrxede,i92 +tionary 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 fm3d /6 +87grmb shndg, o,xv1lh/jnox lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approacnlxn,gms 3x+d/ghdmhrob v/,61 7 oj8hes 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 tl p6kd+i6s/ (ljpi0gwop in a region where the magnetic field vector points straight up. The magnetic 6g/ 60kpllwsd(+i ipj field vanishes suddenly. When viewed from 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 t cl8lzm7dy 2f1s)bf t4able top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in tyf s4l1)mtbf 27dzc8l his 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 magn(doha)3cmj tu/yb; 7p etic field points straight down. The magnetic field disappears suddetmupcb )ha d7y/o(3j;nly. 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 horizontal table and carries an ever-increasietaxl2f )9 c,3q0f-dumo9v mzng current northward. Two coils of wire lie flat on the table, one on either side of the wz2o ,xeu c3d fmlfv t)9-ma0q9ire. 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 through a loop of wire with the north pole entering fh2 c-b t-q 7r+odbyd(s:hq/n birst. As the north pole enters the wire, the induced current will be (ah/-+n s: -dobq r bcyb2q(7htds 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;)l k9 *mne jlcaw8hyc.lle+. ,e-to 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 loop's axis of 8lele+c.cm -n lj )o 9,k;tlale *wy.hrotation 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 3qd6obl lqf6:i3ok lx/f3 4m,dc2y btat constant angular speed about an axis whose dikx3 :2iqf, 6 t3ofy4b lmoqdldlb36c/rection 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 $emf$ 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.z vo0jy/eo. ey m6.gh*
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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 an abv( 8+ykj;9qqdg ti*qhx60b$emf$ 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 magnetiehx )7qct87hc(dy heb213i n qc 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 direct5hp nv5ahs ajqupm/ 0tem,4n(hi5 ,/tion) is moved northward at constant velocity through a magnetic field that points 5hnvtt h4n5 je,h/ 0i,( /pupsm a5maqstraight 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 cons gax 84pb/wtirea 8qc4k-iv8-tant 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 tr 0 kss is;9kfpvhe7g*+ansforms

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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 se1th) 8t 4v cx)485c1qkmc gxq)gxpeywcond. The frequency of the qh 41qxykwcx)g cem51tv)4pt8 gx c)8$emf$ 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 de zznsu9 mh t,/k82yxj*vice 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 devi)e 1iuylcx7s 0ce 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 cc7;fh k p cz/u,,up.jrdjt .w7ontains more loops than the primary coil tr7, d ku.7uz/ ,;pchjwpfjc.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 containt+v;)s(m9 hqw *dettys more loops than the secondary coil then it i)t+y9 ht* dst(vwm; eqs 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, theti7 -k q4zzp0u hjxt,7 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 resonaf/:bflqhuxc 7d w6748:i z uitnt 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 of constanxma(s t3::ve nt terminal voltage. At the moment contact is made with the battery, the voltage across th (:3san:xte mve 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 ansrv7t2 s2hq fyxe7v 44 ideal battery of constant terminal voltage. At tthsv7yr q2 ex 472fsv4he moment contact 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 w,n s7pdhp,q ) t1-yzdw,cco0uith 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 inductvci f:r :gn:;8dzys9fance 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 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 connectedrf cy0 ldyz22/ in series to a battery. The time constant for the circuit represents the time redcy zyf02 2l/rquired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batml1 8 dzz i/yt1t 9/ljrch-gj6rx1ep,tery is suddenly removed from the circuit. Tj9 i r/gce ytr1lj1-m1 h/,xt lpz86zdhe 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 same units ex0 l0nwltv w(p/ b80oxrcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is conneci 07hmktg xq)(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 connected to an AC power supply. In this coaoup,pbd2 2oj+3l i2ircuit, the curren,pou+ljd23o a i2op2bt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequ15utg 6c-wz3o nike/ / og:fhgency is cu1z//fgnk i w g:e-6t3ohg5 otripled?

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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 induc7f8z- .s(nygpmzdj m9tor is doubled, the inductive reactance og7 (np-8j9fzm.szd ymf 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 voltagfkg2 uz9ij/ y9e across an inductor approaches zero, the inductive reac uzk/9gj92y fitance 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 ; u-sbrzdc )2hs6by s08q/ijrAC power supply. In this circuit, the current)sh0;i y r6 bsdbr-jc8uq/s2z

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactai h4/yukhuq4:ndg2n, 24ghsi nce in an ac circuit changes by what factor when the frequency is t4 h2hu/42 4 ykqihus:dn in,ggripled?

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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 capv9 v. qa+0(gdg fbs+veacitor approaches zero, the capacitive reactanv v g+geqf+.0d bv(9asce 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 :njrwa,( sv bc*r09+ evi. ahea RLC series cir vc0b9*+i wres .aa(e:vrn h,jcuit?

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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 deaclu j y-aubgb., - -qtnw.2h)k9e a/efined 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 R incrfba/39 ho -oe7sbm f*a x;vv0keases. When is this statement aovbh xfk3msae ovb*7-0/f; 9true?

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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 c6ntx(gxj8e3 /gb pfb a1m7 r,xircuit 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 impedadx*:g,e gjf w9nce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC l2w2 v:d30fi ykh:wtp series circuit, the resonan0dk2:2w:h lpfw3vt yi t 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 8z- +lsa1onts p3 hyi)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 c;,g(+ az(zvw 9;l f wcd2ghgrmircuit 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 fielh5 lsy:gl6vsxo 6r6+w1vol-qm l *j(td of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paral x6s l+-lt1o5yhgllvov:(*r6w6mqj slel.

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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 magnetx/295y ;gzuzhnuq y+t ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendzn xzgy t9uu2/+q5yh ;icular.

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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 fieldd(p.ij(qqg+:zr +z2j)g eh* vjyn0xq of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic erzz0jnv q): g(yxq+hj.p* +qg j d(i2field 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 ro/k7 q rhne0)area 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 from e t48z nk4l nhm.8ll4 cd7lu0n$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with t*etnk e.4 4 9knprz)azgg*6 osides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in t * neg*64)en4ogza k.pzr9tk8.0 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 jm : e4lfx 6/e9ng1dzzturns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arcuo0nw f;uksj b7a48n(67oj zea $0.20 \; m^{2}$ 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 :+pkzw;p1r:jl44p rogjyq5 u of 60 m flies horizontally at a location where the downward component of the Earth's mg1:wp4z j;4p:ourkly 5qjp+r agnetic 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 ba bmfv iew/g0 cc,eex /g.4v)-ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a verticalf eb m/4c0/cg ei.v, wve)xg-a 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 +q0*i6d :) szf:ifj rwvs+ixhcross-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 turnsp5v6u(vga be1 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 rectasy q,hi+s(.i(q ur lp1 4hqakr*-8 qnvngular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop ra4q -(.hqy1n l*rhvqspi (s,q+ru8kiotates 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 wire of ) jj ,jp +s1f8kgljx,,b*m fmparea $0.090 \; m^{2}$ 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 co tt f/cs*n*(fmnstruct a simple 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 rotatif*t(n/* s mfctng 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 kga +r,j +b peok,vir4 +sz82ywith 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 rewh)3aec*.xt9b x f)fj sistance 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. Thid ys9-th1r7takp9 4u e motor operates on 120 V AC, and when running at full speed it gerk 1au47t9s-t9yhip d nerates 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 ca s7c:q n+qu9jonnected to a 24-V power supply. The operating current is 1.0 A. What is tu sj a+n79qc:qhe 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 rt 7mut)+5skj cv chv;/esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whathuc /)jvt+kt smc57v; 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 co/ o5p/wflxxg5nnected to a 24-V power supply. The operating curr5xfp// xo5lg went 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 to4(lkwo*. k dve 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 ca:evt2- sb5 fyz cb.y kn7.kqx)uses 14 A to flow in the second -zv.2:bt )yn y57.kx bkcsfqeary. 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 the 24)n mfekuf:t)/ -V secondary has 100 turns f)k:m/f uten)?

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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 r t3v9dlin2j a4hx):g a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the9h:n)vlagt32 xrdi4 j 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 i; 4ysns yjr6)gn the primary of a transformer. Assuming 100% efficiency,ygs4 ;y6)jr sn how many 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 s(5u nnkd-2 , - i6pc,n3tjduz7f qssqcign transformer provides 7500 V at 10.0 mA. The primary coil opd-j3,fu 7in6ns52spqtc kun dzq(-,cerates 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 tnkq tlhe-8q t wr++t gz)fnm7s9:d5a/urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.l+:)sn fqqmwt8t/-d 5gat9 ke nz7+r h0 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 10g/crsqrc og*e o3gjb -z5sq;j3o a, 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is ap3qo/gc s 0r, j-;egbrog 3zocjq1as*5plied 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 1jm,fuz5le22 jr8* egl00 turns and its secondary has 200 turns. If the input currengl5e,z28 e2lr umjf*jt at the primary is 100 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 turns and its secondary has 200 turns. pm:1g4dxliwk . / dyv)If the input voltage to the primary is 100 V, mixp4 ./: g)1ykwd vldwe 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 trans/oxeq0xmsea u1( o2q6 former has 100 turns and its secondary has 200 turns. If the xoe0 q6xs ue/oqa(12mpower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of )p9 x8o9 cen1gm.7spmtfq 9yncurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistn.mspyo 1 )e9xqnmp8979fg tcance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u iig8r):lr ;t 9x4neeap to 4500 V by a transformer and transmitted through a power line of total resi:x4i r lt;9)gnaee ri8stance 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 pjuy.*,k / so-b r:nkdstepped up to 4500 V by a transformer and transmitted through auk n*.: o ,yj/bdsp-rk 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 3q0rq,6ya m nwhas 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 would be lost if the transformer were not nq3yra6 0,mqw 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 li3. dl(vwc;f 4b7btwnvne 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 transformer v dbww.t;v43cbl( f n7is 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 le;k-*xg) w6hh wdv mnd2ss power would be lost if the power were transmitted at 3khm2 *vhn)gx6;- wd dw000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a 0v imlbpxjg9z1r:i,prc9p- l6ruf 1742oql kline wi9,70 z1lxol:c1 p2jpb 6qgi plfv4rmr r -iu9kth 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 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. Hosy- 0a(7tc73ac:wp8 jk kcxlow much energy is stored in the coil's magnetic fi x kt( c7a-w3 70cacy:kpos8ljeld?

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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 1 )zeyw ykk5m.88-H inductor. What is this circuit's.kewky z)y m85 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 inh*47 i5f5 z/f 0o4xaipexoggr 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 AC outler ep8--:tatqg+6 rz2 ogvgqm;t. 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 d0 am42d:epfmthe resistance of the lam 0m2m:dpfe a4dp?

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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 supplz91y. phayrr8 4kx5u- in.tugy. What is the peak current through the resistor p5z.r thy4189unkag y-.xi ru?

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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 ac power supply. What is the power digtawzqu-gj+ ;c5 w 2j-vk-db9 ss; u-kjgv-bdcq 5jtwa9-g2+wzipated 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 5celz(g- s. 9gb (mbt*t0-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 50-W rawgjteh22q jk )4b60x esistor 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 resistx zy -mt :s 3i3t/ u)/9oomo,wp5mezzkor 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 onmidwc6mw 7+ ym c,:0rf a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1mcnpl ,; jw67u( sa+fm000 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 ir4i,4 bn: liugnductive 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 necev 9fyw 1c/ 8myf.fk,wpssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 ,z o h/4qgz9p+l vr(uyV AC at a frequency of 20 kHz is a /zohqr z9py,l+( ug4vpplied 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 );wuubkhaj +6h5hy5 p tlom7 5a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reaceov6 yg cq02(ttance 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 reactance at 10 kHt:bu 7x 1m4heyx;v h(az?

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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 reactaj qdb8ap+x1o xd(3w (nnce 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 b./b)qlp ykmm ) t*st70.010-mF capacitor be 100 W?s k myt )pqbb./7m*t)l

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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 )rkh hs,gp1e0 x1 -cmkthrough 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 seri :k2egyi 369o,pvdbj ies circuit with 12.0 W resistance, 15.0 W inductive reactance,9 :ii3y 2,gk6vpd jeob and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz :vr22gnc;93 ef xli1fjz9j dw if a 100-W resistor, 20-mH coil, and 1.0-mF capacx:jr ;3v 12jg 2fzeif9cwndl9itor 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 resistor, 20-mH coil, r,gmjj x, v-(fand 1.0-mF capacitor are connected ,f,- x(grjmjvin 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 2nvy 5g(6ulkh7h+mcq2cx9 v f3y28w nv0-mH inductor, what is the impedance6kh lnqhun x2+y g5y2mfv8ccvv( 3 w97 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-mH indfgb bmc8l0j3, ri.m (guctor, what is the pha,j8 mgb mgl.0c3br fi(se angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 2 wyb2i. : o/ypidduf7*0-mH coil and 1.0-mF capacitor for a total udi o27:p* fdyi.wb /yimpedance 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 capacitances is needed in series with a 100-W resistor a -f.exv9lf fo0nd 15-mH coil to get a total impedance o.vff-fo x el09f 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 sersiao:wmob/. hp9- l33m7dge cies with a 450-mH inductor at 5000 Hz for a total impedacp wlod e m3hsg i9b7/m.o:a-3nce 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 p 2bk- avy xks3 ;,5jmevkm(4cqut in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?jm5 ck3e-4ks2 (vbv;yq,x km a

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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 p6d );pte amo/hqp 15yimpedance aq/o a6p ph )51e;ydptmt 1000 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 5*lruz. w j1t.fof 5*gnxdpd0in series with a 10-mF capacitor at 1.0 kHz for a total impeda. udgot f1j nlfd5.xzr0*p*5wnce 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 x ci rs:lf:4(x19 pfzqa 10-mF capacitor at 1.0 kHz for a phase anglefxri9 zlqp4:sfx(1 :c 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 need*;rk vl2 0;we4w6rcwz7 okimsm g:.yded in series with a 30-W resistor at 1.0 kHz for a total impedance o.vwril7k:kmm4wz0yg;dwec*s 62 o r ;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 cap.(k 0 t9gs-oqbza. ntvacitor at 120 Hz. What is the phase ang(qvkotagsb. t 9.0z -nle?

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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-m5bl4wfm so p+r :u:ej;H coil, and 1.0-mF capacitor are connected jl u;bo:4p5 wmer+:fsin 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 ap2s1wb; aj2 hy 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vpaw jhbs;1 22y, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, anodom/ln .3oh5ai8t6i d an inductor of ind8i.3 6la m o/todi5honuctive 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 for a series RLC circuit m1yd:6kl wex* containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected*lxd1: ymkw6e 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 nec+x1zc j12xi- s.ljpm vqw6dl)essary in series with a 500-W resistor for a phase angle o.+j6 sd iljclp1x w1-2mzqxv) 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- w,+k2i7sdasn mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power s+dwsk, 72naitransferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac serzcg)e e n 62tytr ydw)/ya2f/;ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan)6;d 2czttnfa g/r ee y/y)yw2ce, 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 circuit is p7xkdsft(su fe18 2z-$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of g*doe7 1ttyb i:8p;bg30 W. What is the power facp:7y t;8teg1gb b i*odtor?

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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 y qgo y:52x 0t4dirrv1resistor, a x:2 5gyvdyr 0t4oq1ir10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequenj rg(,x7lj+ s4:tsfvbty1g 5icy of a 1.0-mF capacitor and a 15-mH coil in series?y4v17 +tgs(rjslxf,5jbg ti :

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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 fk 9.dank*qu3+b93 g *hoqies mor a resonant frequency of 1g+ak3 *eqdh 9q*bok9 sim.n3u 0 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 with a 3.7-mH in 4ahtzb ;s() 8sg74(fpglkvvh ductor for a resonant frequency of 100vt g szpf(;7)44hgbkh sva8 (l0 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 placed in series with a 30-W resistol3c lp6*hrgji3 f4q4 ur and a 40-mH coil if the resonant f46qj 3pc il3 hgl*ufr4requency of the circuit is to be 1000 Hz?

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