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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 magnetic f69)xfyk5mz-fg/udu 5( rq gg qlux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thfv ejg-6m;k :we $emf$ 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 c.qv64j z .0/r 8f.mt3xhtnn kroig;kof loops of wire in a coil produces what kind of change on the inducqtm ghj ;.kf ninkxoz3r8 0/r. 4vt.6ced $emf$, 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 wh:4 2i6fvx jd -d3yfhn9uw9qpwat kind of change on the inducey236-:hnfxpju 99 i vq f4wwddd $emf$, 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 ar.ug1 1frhp5aq m+9 n *9lf3cn. atphon the indua 3mc59 fu g19.art l +anr1.hqfnpp*hced $emf$, 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 magnerf15mll xeo 456)6f (w0*iob e bbuvvstic 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 current in a conductorx(c*l0hgss lif+1 uv* will be that which tends to produce w10 lvschig*xsu+ f*l(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 tz*-ar 9ta+- wxvgg7a lable. A bar magnet is held above its center with a axg-rw7vg9l z+a*t-its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizocw nyqw 3/ fhi3s ,o(4gunm)0bntal table. A bar magnet is held above its center with its north pole poiumn (gnwis03q ob h4c3w)yf,/ nting down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where pfb4bz 2 ges9t; 4re5hthe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inb9e4r;zt5hpbfe sg42 duced 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 magi, d,k,bzw2rip fjdx; rvr6ux,vt73 4 netic field vector points straight up. The magnetic field suddenly grows stronger.rwf6 xpr;di4,23 v,ij 7zxuv,,krt db When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whetm2n/ro 9*q nqre the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappearsqq9nt o*nr2 /m?

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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 horizmo22p1-dlf9 9wjju h+xoh* tj ontal table and carries an ever-increasing current northward. Two coils of wire lie flat on t9-jpo x1*j9u2hh otljwdm 2f+he table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fi7b g3bp6d5q qarst. As the north pole enters the wire, the induced current will be (a57qq 6pbb ag3ds 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 cg ;;.qc /d9+imr ptw7 ca2nfgponstant angular 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 rotation if the induced7p ;p+c fnrt q2c9m.i;dagw/g $emf$ 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 ang ( bv+ofzk8fmi,hi 4z9ular speed about an axis whose directio8+ib ,9ziofk4(vfmhz n 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.lqg/. 6.2 l faqr-nopm
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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 5ar/9zjkzc yqz02 vodu *z0 b4$emf$ 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 f.r7w xp fsk46+xp0fkkield. 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) is m oxnw.., c/: f 3kvrcx;sqw9pjowb2q *oved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodq ww*q/o ,wo9frp .xkcb;3 xc2vs:j.n.

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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 -bsesjjr.2( 0kp/ .xrw ,b gjarotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transd a4r d hl+;5hx.z6lza79 toegehl;q5forms

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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 revo hg0 (ic7yjf u0fhq;/m 8d5bedlutions each second. The frequency of the ( qfy08hjeugf5dic ;b7h0 /dm$emf$ 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 /xd u4899 v8xs r1wy6 s5njhu2xs kzoaused 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 devic 3j8o)u cena p7.;m5er z2kuqce 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 containh6j ; dn)b83goi+ uwet.xxp )n*iaxk/s more loops than the primary coi/d; unx)3giahtx.+ p *einw8okj6) xbl 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 se w(fj- sq1/hagcondary coil then it ih q sj/fgw-(a1s a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the po.1n yebrr c/ 4)jf/9zievtgs6wer 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 resona68hn9 r-/ bptc wte+chaq40d l7snl8xh 0v1f hnt 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 id99 / cx6 uaf8eitf7mteeal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the c89fe67/xmfue t i 9taresistor 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 battefbv- la5010nyvz axal y kob;.0po-9 zry of constant terminal voltage. At the moment contact is made with the battery, ;f-l y5o0bkaz-yo0 p0alv nz.axb1v9the 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 iyv/nu96b:ku h 6j hn6vgro w30nductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is yd48fyur-+ cemibetma(* ; . tconnected 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 ar( +cdz j*zo*coe connected in series to a battery. The time constant for the circuit reprz+c(**c zd ojoesents 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 battery. Thzc sl52ail6t9 qyq9(de battery is suddenly removed from the circuit. The time constant for of az 2yil ctqds(9 l596qthe 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 sa jh7bl5kg.ew mj,2ah3 me 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 this circuit, the- a nf ptz;nv(;zmn6 4kj+5ngv 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 **lr9ed/ug6y sxa(rjto an AC power supply. In this circuit, the currentgx sd*ue*r6y9/lj(a r

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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 changpe7pw bt6fc83 /0xogw es by what factor when the frequencypwp0c/bx7fgot3 8e6 w 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 9)h9ehs1 a bgkf/, o-bhcz 1vpAC voltage across an inductor is doubled, the inductive reactance of that i ,/)1f bkg 9asbhchz1vo-eh p9nductor

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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 apprv.ag)9dzqd4ku d k 8k.oaches zero, the inductive reactance of that c9 .a).4k8kgdzdvukqdoil

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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, the currsuau tz 1s(x(7esmh83enaz s shs u1(m7u38t(ext

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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 ;zjiezoo;31h6: f ;bsg frwf4ac circuit changes by what factor when the frequencf1 zr4efgwo h;:;f; 3 iojsz6by is tripled?

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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 voltaw q;v*/lp(v0+*wudcl ed 3qb:g0w ssxge across a capacitor approaches zero, the capacitive r(/ scxq vdvw;lwe*bq+ p3d:0s g*wu0leactance 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 a tc .z-w.eujgy6dn0 .v 7 uc;hyRLC series -7vyz.hec.y.w g;cj0dnu t u6circuit?

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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 defin.sjbak0 / obad1jq 2 //evg;gwed 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- -77ctv wt2rpreukt) the circuit increases if R increases. When rkv p27 wcr-e -tt7ut)is 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. The impedance of the circuit incrhu6;-e jfojb)w(;y (5obr,kopna 7w w eases 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 the circuit incr7**i/9hsnxc bkwjvi 7 ow;o. qeases 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 doubleu;(c7zm t ggn8sw m6.7 pwd3bt8 pea*e in an LRC series circuit, the resonant frequency of that ciptea c8gd; 8 67bu3mzwep t*.gsn(mw7rcuit 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 appix52 3 z,zpbe1gc5n.lx f 0lvilied 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 serie0tikyx5m6 n.os RLC 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 of 02mwf/ h8c 7n k 9fnbeka1iu20s.20 T. Find the magnetic flux ni90mhka /k72cb8f w1 sfen2uthrough 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 ial9cyu,qq)dsoo+ 1,dy -y*o.crgd+ kzn6 ;x d s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicul *dg, dxqoyd.y;+1qzocan6dcoy,)+ l9rk su- ar.

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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 unifoxwpu 7zjv44u5rm magnetic field of 0.20 T. Find the magnetic flux through th7 w5j zuvux44pe 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 loop is c(9 afies7b83zdc: 0)k.ca ucukv+,fwle 2a m 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 fromk;do9cn 0 vy/(eli79 b erw*sh $4.0 \times 10^{-5} \; Wb$ 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 ef5 6*z*tqyuvccmx/; wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to tv5q*cxz/ t ;emyf*6uche 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 a 5mmitg4bn)e 6 hqr59orea 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 anetl(5 gf m))hjd 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 60fizq re)1i3s(ss *fr89v y6la m flies horizontally at a location where the downward component fql r9 esa8zv *61(s iri3sfy)of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that isjrfs+9 l*1ig c 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cg9sc1f+rj l*ionstant 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 l2nze;3oaa0 my4 ild/xdf xl6 54(qlnpoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistsrjw3. 9if sw0ta6x ;mf of 100 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.7z .eev aqesuk fwb32j5vt 119 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates fbet31 v.u15 sw2e7evj9a kzq 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 33 m mz,yp.cc4/woz;q py v7fhs+jr,xof 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to c3 phoy/ wjsa9lz;z p:9onstruct a simple AC generator with an output of 12 V maximum when rotatp9psj /z z :a93hwoy;led 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 a macg5 ;m 9qjlgs*ximum $emf$ 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. The m 7h*pufea,- 1dmnv:tx7t c(sx otor 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 mrq06: i,mcwxt3kzqpslmk/;leu+pm* s b 3)a6otor operates on 120 V AC, and when runnqpzmsamb *)6t3+6eklr:q0xpki , /sc 3wuml;ing at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. T1vwul + e(jgfoo167c4 j*xfmphe operating current is 1m+xpu7cjf lfj(g6ove1 w1*o4 .0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6fhlrn)t g--y/ q u:fj8.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th r f-yhgj- n/)tqf8ul:e 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 supply/0ifkd75k *tffkd*7 q4s qxzu. The operating current is 1.0 A at full speed. zu5ds70 ti**kq4/ 7dq fkx kff 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 isy+: ir,fzb 7hhyu2+l9vis bn8 needed 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 prima e90+ .bkskpy ilmy91vmrq q(t5 +enx6ry of a transformer causes 14 A to flow in the secondary. How many turq em1.(0bik qpeslynrmt +x+y596 kv9ns 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)fa ;d5 - ttzj9:95 emwveahn9 mw-ubb-V secondary has 100 turn wuabd-jmfw559veez ;hmb:t 9n -)t a9s?

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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 s8ds d7862ttj:sue*d at *mfla 2000-turn secondary coil. If the current in the secondary is:ad*djt*duss6lf2 8 tsm8 e7 t 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 1 0l9n:nhce1i x00% efficiency, how many amps at 24 V can flow in the secc90n x1lni he:ondary?

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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 tr,. hairf+ 8a62:m:j jy evwsu 0v0wmhransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dvj:f00hsjwi e: am+ur2mr6y.8 ,a h vwoes the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns od4 ut7gkek 6sv/k y-q,n its secondary coil. If 17 uve,kygqd- sk/64kt20 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 and 300 turns on its secb vg*0dyqcmj,/k /iv.y9 vax-ondary coil. If 120 V at 2.0 A is applxyd,b09 ai / cv/. *vqm-vjkygied 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 o 4r6/a 5jt4hflftuf gyo6/u .200 turns. If the inpuh .6jlt /o t56au4 4fyo/rfguft current 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 secondarc( hnv,e.52 lbkx7i alw++l7. pcewb by has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sec7wc.,eke cp5(7xih+bvnb 2l a.l+ blw ondary 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 seconohvq 9d76g) :qq4vk /a6o lckodary has 200 turns. If the power input to the primary is 100 W, we can expect the power output oqva:9do6qk v c6lh/)k4q goo7 f 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 2. ar y0ewbg0jvr bn,/of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary vwr/ bner yb 2,j0ag.0has 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. Th(71ugopk wotrny0g -*e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transrguo(y pw0* ot-7kn1gmission 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 ad sd1,i17mcr at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transd 1d7mr sca,i1mission 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 relo0flqwwkjf ec/r -47 :agf0:sistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line4ffwle ::0lcaqr/ gf0- k 7jow, 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 li0xe v.t4a6ngdne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to 04 veaxtg6 dn.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 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. keih8x, suc1qjy20: k- sjwd6How much less power would be lost if the power were transmitted1w8q -2kkjxuc: ihs,y 06sjed at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitt8gaq q,eaanyj o c1)f,j/1rp3 ed on a line with resistnay1813fa,o j)gqarej/c q, p ance 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. How much energy is storeqx9zi hwq,qo gu:;1offybm5j83 9j s3d in the coil's magnefs9 1qxgu:fm o;qziyhjo , 5b3w9j83qtic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induct.y)mpeu 4 -v5hf xv;ktor. What is this circuit's th5xf4vu;.kt)yp - mveime 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 volth6xtlq hes1 j/ud (m25age 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 outlet. What is thee9( h +js;fzdde*5s-o/yxhvud 7kr+ f 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 o, o0amd:hoo/ :2 pvrzthe lamp,v:d 0roo om2a/:z oph?

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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. What is mq3ob :kuj99b+;s(2wo9a sqpyomar kjpr).-the peak current through the3s9( qy j )qk prua9oo kp+sm9.wb-mr bao;j2: 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 ac power supply. What 6s- o yxe 380sp(mfsefis the power dissipafs 3xo6sy(e0 sp-m8e fted 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 resistor .fbq7osn n 0q5;j,jtx 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 resisto+utqf2 .s3mvjr 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 h8if2a psjp38c c7b 2vresistor 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 5 h+i(sofltx 8yukld:*-(.m 3ogqlwr 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 f:4n,g pa t00+fwnimfreactance 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 yf8qz/d0d jjz8jh 02 )jl5bfk 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary fok;6cdrq 6 :(dif: szecb533yss alv9mr 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 indu h (nwor(kr/z:ctor when 120 V AC at a frequency of 20 kHz is ork(wnr z :h(/applied 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 d(4oc z9uirx8r ue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactan.uin4/91 8x6rrtrkm) z qc nqpce 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 o 1bl6v) cvpz mp(.qb*vww c;r,f capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doen3o3/dx u 0ouhypv:l)s a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF ca zpd:ga+s)gg7 pacitor be 100 Wg:g sdz)g+a 7p?

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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 Hz and 5.09f-k+ ztzp)wi 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 a z8xta)y snr48n ac series circuit with 12.0 W resistance, 15.0 W inductive reacty4r tn88s )xzaance, 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 Hz6 t5 quf)hb 53vsp7azt2e)dmy if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are )p3z7mbe2dqsu5ht6y f) vt5 a 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, az*fit4 k h0g59g-bn+dot jxx,nd 1.0-mF capacitor z *xh+5k-gxif to9d t4,0ngj bare connected 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 qgex9p:fx f30 inductor, what is the impedance ae:fx q 09gpxf3t 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 ser6of mj7l fz( a2l8fui a1f+eu0ies with a 20-mH inductor, what is the phase ang zljafu(ff867 1e a2loi0 u+fmle 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 20-mH cohbw k3k ;/zm9ta,c-nb il and 1.0-mF capacitork/b-9nzc,3aw kt; m hb 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 capacitances is needed inyc g03d,g;lwhjocsa*o 3b n;9 series with a 100-W resistor and 15-mH coil to get a total impedance of 1109y ; n3oclc3j whsdg,;og ab0* W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a to2.playa) tq, z 5oh,nvtal imz2q)h oat5.,lan py ,vpedance 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 resis/s eztr t0 *6kw5l0kgt9wy-7 kwz9e fstor at 1.0-MHz for a total impefkw*seg 6rty /7-z5lk9wt9z0 t0kewsdance 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 nfbw.u ah-ehho;/z,7is the impedance at 10u7hfo, -b.;zenahw /h00 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 in series with a 10-mF capacitor at 1.0 jb)pg w: ztwkeigk 190cp ,k1(kHz for a total impedan:pc09,pb(w t 1wk1g jeigkk)z ce 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 10-mF capacitor at 1.0 kHz f p- ,4: g7g+mz+zme5ren)eyedr3ml idor a phase anglemipd7ery,+l5dmnz g3 )-e eezrg m 4:+ 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 witf2l+yd .+kt)l -csxifh a 30-W resistor at 1.0 kHz for a total impedanly) +2f.xkfcs id-t +lce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120n**sls5k n.2tqz k2v a Hz. What is the phase anglek *25nssk2l.qvn* az t?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 0n o(7ah )lrez1.0-mF capacitoro0ez(7)l anhr are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistou9www zt q3cnml,(o6, r, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is conno nw(,wq t6wz mucl,93ected 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 reactance 30 W, ane a hd2yc3ro,he7h3r/1dys8 tpmr+g /d an inductor of in,e 1/t 8rh eryr23ayco d s7dmg+hp/h3ductive 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 Rsg5 u +/pi 6 t8uoubop8qhed4:LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a :p486 /otpq5u ugusbo ei8dh+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,jsl;t1b:c)xxnb9 ydul x x*) with a 500-W resistor for a phase angle of l:byud;jtcnx*)xx1)9,ls xb $40^{\circ}$ 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 = 20vw xkaxj0r2a,sil57 / 0/eijy .0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from 2al0ia i5 r7y//j xvxwesk,j0the 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 series circu n2f5a)y jykq .g)l-xoit with 12.0 W resistance, 15.0 W inductive reac)a5 .nkxyfgq2ljo y )-tance, and 10.0 W capacitive reactance, 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 anua)y0pyy,z ikauq:37 ; 7.ohkoqrbm- AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistal0 gnh48: gklnnce of 30 W. What is the0 8glk4gln :nh power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contaipj,t ,bx wa,7yning a 50-W resistor, a 10-mF capacitor, and a 0.45,py,t 7,xbwaj-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 frequency of a 1.0-m, rf( f js/qw0.d8veojF capacitor and a 15-mH coil in series?0jfq .vdo,(wser/ jf8

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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 4.7keq :db5mr)a8 -mF capacitor for a resonant frequency obm:) ar5 8keqdf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-:* -j z9xsgv) 1v4+vzbubyp fimH inductor for a resonant frequency of 1 )b-ziv:gy b9zs1+fxpj 4vvu*000 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 musaid55)2ojupupb gv qv ndy.m7c.:78kt be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequen2pmi y.8 vdv p5n5u.q :oja uk7d7)gcbcy of the circuit is to be 1000 Hz?

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