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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: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following 8ziao6ledr4 ,9q5.on nu+jh s+ q+ xerare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducy (q-u :+n,6c mbbead c,i7eoption 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 loops of wire in a os 3q6vs6c-bsf gh( 2jcoil produces what kind of change on the 2 (3s-bf6h6js oq gcvsinduced $emf$, 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 loopvz,khch 9hu;+g/* n9ijsx8ky of wire produces what kind of jgn/k *98hzk hcvh+sx,;9uy ichange 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 lo,q7*n7f4 c3lp dfonu :fu:spf* ;utapop of wire produces what kind of change on the induua3ff ; 7u 7*nu, nc:fpl* pfoq:ts4dpced $emf$, 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 field)wjti- ;u2upa 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 conductl:n.-t nbsx:u or willusnn .b::x- tl be that which tends 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 a horizontal table. A bar magnet isg ej,/b 0c8 gxrcz:t/k held above its center with its north pole pointing down. The stationary magnet induces (whenbjgtgz/, /k8r xce0:c viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnjqd -t5o/*gca4yf) i:0l v rmfk4 owv;et is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when o:0m /l w4vt5d*a);f fk4yr-gic qojvviewed 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 regiw0p uhm)4o l1) a-4(dzfl vn(5evuv zqon where the magnetic field vector points straight up. The magnetic field vanishel5o p()v zu1amv4l dn)z -whfv04equ(s 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 table top in a region where tilpfc 40h:2qjd n . nrm( nv-kyi.-gu1he magnetic field vector points strjv-duni4g 0r:nym-2.fqh p1. (ckinlaight up. The magnetic field suddenly grows stronger. 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 where4ri ut- evo4. qda4/nu the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is theqtuo./-vde nra u44 i4 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-increasin* xgg ++x9btdqn(o/ztg current g 9qt +gtx(*zox/b+dn northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wirb 8b.qu dt5+lxe with the north pole entering first. As the north pole enters b5lq+ut.8bx dthe 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 sm5dxm +n/o2ovq-)v mmpeed about an axis whose direction can be varied. In a region where a uniform magnmno/oxm 5vd+)v m m-q2etic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speey8 cydbu z2.6td 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 ofdbtcy 6 82.yzu 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.+q,lplt00 v qs
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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 3 9h vxdaxu3u5;jm x7o$emf$ 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 ff/ t/ ejhp*e4p6qkjvw ( q03agield. 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 easly hn pa1 i+q;c-(wu nx .9dcmha/1wv(t-west direction) is moved northward at constant velocity through a magnetic field that points straight dow wc( (. d+1/;auq 9 hnwaixcnvy-plm1hn. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloci z-0nd9nq s*l7mqahgfpl c+h(um29o0eg n;4gty $\omega$ 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 transv6v.q y+kxov06 mk;liqxe+zw) 6:ea oforms

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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 revolutiongw5nzp su86b l9j/qg (s each second. The frequency of the s bz6/w gq8(p5unglj9$emf$ 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 devi-eb/f zdz 0) )yjsq)yf 0nr3nsce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th67v.ay(p 7-zj fgkejoat

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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 loops than the primar :u njrdut+ reu h,w:*dd,7fr+y coil then it is rthueru f:u7,dn+ :d,dw*+jra

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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 secon2ua -x 6i2w5qnb ;zyejdary coil theiuz5yjwe;a2 -6 n2bxq n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp7z( 6vfwgisroxc -:d9 ut

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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 resonan(fy . ;dmlvs/bsu+,fv t 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 ideqf6b-y),ps ye(k cvl4al battery of constant terminal voltage. At thev pc(s- 4l),ykyf 6qeb moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of ccnl4b dy,* wo4onstant terminal voltage. At the moment contact is made wioy c,n4*4dwlbth 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 i3 tvxqgfhj*1 nrdo/w28k 9v8p nductance 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 indccvw4o;.5*y ib tq,nnuctance 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 cowq *m3mp(p(gdnnected in series to a battery. The time constant for the cm*mpd w (g3p(qircuit represents 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 i/h.vf( xexgv3(vcsq h-*;od 3q (idkseries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represeix vke.hoqdd f-(3 c(/3q; i vgvshx*(nts 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 e3( ;j4xqpwa wvbhx;1zxcept:

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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 supplyayx prf9 pn40 bo.1s73htau -g. 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 connegb l+lflq7m z.m9a -y5cted to an AC power supply. In this circuit, the currenla5 m-mbll7 qg zf9+y.t

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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 stm0k z tmf9+8when the frequency is tripled?98 fs+t ktz0mm

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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 anhmnnsmo:r q0+gc5 ju(5 /arj2 inductor is doubled, the inductive reactance qrn 2n m(mj0 +hsj/rca5:g5ou of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an induct2tg 1uwtnf35( ppvu1t or approaches zero, the inductivg2 3(ptuut11f wtnp5ve reactance 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 connectebczgkq7 *:yg s22iev t6:xx8jh*c )vud to an AC power supply. In this circuit, the current7* gg2 :v2 bke86cz *qv:uxhtjci)xsy

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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*f wnsg(qadkl88 *o(rprp64*f*rhr l ac circuit changes by what factor when the frequency is d48lkwra(6nof* prh 8r(fs*rl pq*g* 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 voltage a).e pkfgtdd7lu3h6mf4 a 8v w4cross a capacitor approaches zero, the capacitivuelpd 4gt h6k.7ff4v3d8 m)wa e reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle jn9xhe-a:jd+ between the voltages of the inductor and capacitor in a RLC series circ xn9e+-jd ah:juit?

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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*s 4k oh/)y-frst)pjv RLC circuit 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 circuit increfg4 s.1h u3d(gqee.imases if R increases. egm13.edhsqu gf(.4i When 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. Thek2tz/5 tn j.qq impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series ci*oh d7)u 1lqs.q /2 nttf;nhzbrcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, tpbekpa;nk 4m 1*:gpf3h :.(ooebvje/he resonant frequency h poe (vpnoe*fg1mpbb.e:k3;4a/ :kjof that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volthhjj*jyi 1wv0-qv4i1g( -dh mage. 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 circuit occurs when fsmhpnb35v-79v5 n8q/ouv lk

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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 amjoxg+ztk nso *7 ,9i5 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when 9sx* o,g5i nzjtok+7mthe 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 /o,g mzm5p-pdrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when zgd5 p-o/mmp, 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 rads. 9wuex/ a3qvxgp:kjp7 y* )bius 0.10 m is rotating in a uniform magnetic field of 0.20 T. jp*uwyv9 sp: qxkb7)g./ aex3 Find the magnetic 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 ssm pr9eg/) u 2f-6trmsingle 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 frndgy)ma1 7(ep om $4.0 \times 10^{-5} \; Wb$ 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 side-c u kr+yai4)aj,wv-(tnyd. f s 18 cm. A unifo)wu -fn. iv-y ak(dyt4, r+jcarm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of moh /fqz1;.b q/z .mro$0.40 \; m^{2}$ 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 areahxhu*i ug7wq -na.(2unj*i0b $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fliexx0t n dfy.uw lr;.rjz012nv.s horizontally at a location where the downward c;drunnxt1j v.xy.0fz l0 rw.2omponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a coc7mo23 i)muvxd k.1wqnstant angular velocity of 2.0 raku o7c).xdi1mq2wm v 3d/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 l78li1pj s8jex oops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofb s3i+hqc xlvy oo*/5, 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 armatur)d aak ka;)ahr ;j;mp6e. Each loop is 12 cm long 6;arma) djkaa;hk) p ;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 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 turo1r 5vj-x-trz ns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC9fzgr0 b r9y. t4hu+px c)e2 jldy,0hw generator with an output of 12 V maximum when rotated at 6 +le h02gyp b4r)09x9wz. cthfrdy ju,0 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 generalodmr( : vh)a l;dy u5tz,jf9,tor 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 rys; /ucvn8q):7mhi j aesistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oppd44e x 5thup3e3n-c6st e x)rerates on 120 V AC, and when 3ecp )tenx4pt -u3dr 4xh 6es5running 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 u txlstcdb3c .sh;55u1*sp4u6.0 W is connected to a 24-V power supply. The operating curu5 c t bp1us5 3hs*;l4.tusxcdrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W (e/ tvru gy.w+is connected to a 24-V power supply. The operating currtw.r(ye g/vu+ ent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to f hr579jav 9id+hu2vq a 24-V power supply. The operating current jf a5ud9hr hi+7 v9qv2is 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 transformm,ow0.bkz:-d; hbbd)72c jo xz 7og nter is 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 primary of a transformer causes 14 A to flow in the seconp:; qk;gqs dt*dary. How mat ;sk q;dq*:gpny 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 110h+bnhyrv3- -pfi2r * so)a2aq-V primary if the 24-V secondary has 100 b3 2 qhfavrph2*)+yn-iar so- turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consis,x( *k7oj:veh s,wz of;ackqc5 hg:c2ts of a 500-turn primary coil and a 2000-turn secondary coil. If the oce:;s57zx(, c*vaf,oj wg khhc:2qkcurrent 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 transformer. Assuming 100% efficiency6k 0c y-nqpzru1x(b; t, how many amps at 24 V 6rp nqc0 uzk1 y-b;(txcan 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 prh ee5gjgq.i16c q9sigsb+ l*j.h-hy7 ovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primaryhe . -q jig76hgcysb.gs+1h*el59jiq 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 prp *gn;lw p;8+omr 2.a6ggtdieimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primar 6glp8do;a; +grwm*.p2gt i ney, 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 i k / h1ftsxcb./ k o040t w6rka:8ofawao*)xasecondary coil. If 120 V at 2.0 A is applied .0aka b/w4t0w1:fasxko x fcia/8*ot r)6kohto 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 hakq9p7 /s gjlqgq/jn34s 100 turns and its secondary has 200 turns. If the input current at the primary ispk47jgsnlq/q gq9 3/j 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 secondarydbm/hu6;rz7 9xk7 yw p has 200 turns. If the input voltage to the primary is 100 V, we can expemz6kuw7pr9 7;b dhy/x ct 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 transf0tr*;in:gvt y ormer has 100 turns and its secondary has 200 turns. If the power input to the prim:iynt*gv; t0rary 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 current ht. ghipb)4(xat 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 has 2 bpthx(4i.g)h 00 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 of4 6tp um01x8h1+ai vq svd7n 0ntf:wui current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thrqw8xni ma h4 vu p71vni0+dtu1fs0:6tough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage isvlgyzs9ri*s)1t o0) mrr n/9v usually stepped up to 45)s0s9 r1omryir*vlzg/ v n)t900 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generw/q f v)1 3(mcamqsgj5ator 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 (jsqmcm1aw3/ 5 v )gfqof 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 0.60 W. A gene yg6)2hympfz: rator produces 100 V at 70 A. In order to reduce energy loss due 62p:g ym)fyhzto 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 les1(n3v g6gunguwwnz7 4s power would be lost if the power were tran3g1( wu 7g4nnzn uwv6gsmitted 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 l:fbyxcj.w sj;td; 5+ kn(ii) V at 20 A. It is to be transmitted on a line with re j ;tk(cd.ys bnl+; :i)xjw5ifsistance 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 stor(nh4wf* yu y,b-n x/aled in the coil'uwyah4/,- xylnb nf(*s magnetic 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 indu2 (w8uz es0lt,z(4jn(mp g jynctor. What is this circuityg8el2js(0 ( jnzptnw(u4 ,zm's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage i:usa3) onxmecr 8,d 8xs 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/m hmw,) e a9:ko3 l1/d*tyqgbyay/ai 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 120-V AC outlet. W/ w6cnz94 : 9e )gk+2lf0lhiugueqyz ohat is the resistance of the lamu hzl:ciz+uk0 /9g9yeeo 2fg6w l)qn 4p?

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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 co9 7nn ,dp re+6i b92a0fnwtkjennected to a 120-V ac power supply. What is the peak current through i76bjw,0ndp a efnretn 9+ 29kthe 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 auz i8q3jy k(k3u s4et3c power supply. What is the power dissipated in thetuusyjk 8 ki33z3q4e ( 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 i sncbyk0n2imt 1o-m2:s $I = 0.80 \sin (240 t)$. 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 resz/nyu a:8xw 3aistor 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 resistor isap;pskk 1ndyjg j 1)(0 $I = 0.80 \sin (240 t)$. 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 +h9l1gxgatbjb e 1*.fof 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 1000 Hzcn:y q 0p kuc2n.zyw7e;+a+po?

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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 1dgy:5pp51sn j 4.0-mH coil have 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 for 157 W of inductive reactance aaz5+ d2 t-bd,wao lr)ft 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 whqp,d-3gb mv5j en 120 V AC at a frequency of 20 kHz is applimjd3q-g pbv,5 ed 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 coa/4mpe//h w faui)s3z4 2idzvil due 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 reactance of a 4.7-mF cat5(cmybop5b 8 jtq(o* pacitor 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 reauzkrt/8 *sbd6n:4z w ufnn ::cctance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF ca5 xk8 hubj1aho,z3;cvpacitor 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 reactan+/ dcum7 b)bpz .(w oj m21l u*3(egaqlsjpwp(ce of a 0.010-mF capacitor be 100 W27l/wpu. mmdgo1aj pz(cq be3(( +p *slbwj) u?

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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 capama: u*:w fv.jxcitor 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 inqrq1xsgu48b 0du1q 4qg srb8u0xctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, 3 j;gy:o2s*aj 1oqtqa.kn3 a1yr0 pepand 1.0-ma ;es 1jayyrto q:o021q.k 3 3pnjpa*gF 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 t:q(3- vug-fkti9we da 100-W resistor, 20-mH coil, and 1.0-mF capacito-geq -t:v3fwid ut9k(r are 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 ay+wm8gm2/ebh 20-mH inductor, what is the impedance my 2b8 em/+gwhat 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 f itw1beg:1n+series with a 20-mH inductor, what is the phase angle at 1000+:w i gne1btf1 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 coil anq9ftp /g,g gp2u d61 hryb)t*rd 1.0-mF capacitor for a total impedance of 100 W at 1500 H1p2ghd*9rr t)ugpbt6/g,qyf z?

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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 rsl:o z2;3w1a1rl vxleesistor and 12w o;x1s3vlez r1l:a l5-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 put in series with a 450-mH inductor at 50o3,zb5f unnv7xesz0;/ y, jpl 00 Hz for a total impuxp ,3 j5; osz nlybe/0vnf7,zedance 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 bfq c0t2cim tba) h6,*-ac ljc,e put in series with a 100-kW resistor at 1.0-MHz for a total impeda2f cq-hltj, ca b6m)a0tcic, *nce 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 hte(qwc/ m,n8 -srvy6capacitor. What is the impedance at 1000 Hs,h /wn-etcr8ym(6 q vz?

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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 capacitti)9tbu2ir 7*i / gzbcor at 1.0 kHz for a total impedance of 45 W?c bg2uti*ti 9)/bzr7 i

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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.b4qc0; cgv- bcyzd6)v 0 kHz for a phase angle of ccz-6;d v)0b4cb yvqg $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is o)cawk)4hv fsyq 93 p+hw i 2d,5frur;needed in series with a 30-W resistor at 1.0 kHz for a total impedap vqdai34fys;fh, u)o)h2rcwk 9r w+5nce 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 w 07jyxq +h/vw*u d qln63z*dxbith a 100-mF capacitor at 120 Hz. What is the phase angle?bhznyx d7l60du3+qx/*v *jqw

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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, an.emgy1l mx 4y(d 1.0-mFlmexm1(yyg4. capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacito2 pwiawha86h*e-rgwm 3o2 a 3fr, and a 0.350-H inductor. The circuit is m 28e*-awriah pah w23gwof 36connected 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 cap:tnu p;9c6j wr (riq ju+g4w/macitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows ugr+ jw:u6t/i9rw (4;pm jcqnin 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 containing a 50-W )+leixi.m2q+ z4q wl rresistor, a 10-mF capacitor, and a 0.45-wei ql 4. qilxm2++z)rH 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 : 5e/;hsfyktx angle ofk 5sfyet:/h x; $40^{\circ}$ 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,s9 xk35j5d. ymwt tiuusp) kop(,j4c; C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source?yi 5,(pj.touw 4sc5 3xk ksujm;p9d) t

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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 outpft y 3dt7/c8a.dsyw/lut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivf8s d.7tytacd/wy 3l/ e 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 an ymf)t:j60i cq 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 impedanc ap)8hq edc4j)e of 60 W and a resistance of 30 W. What is the power face)a)hc8jp d q4tor?

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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 rn37 vao8rksi.o4b ur9esistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poik8arsov3 4bruo9n 7.wer 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-mF capacitor and a 15-mHgw/)k:+ cseoy ( z2tjf coil in series?(e gw:f+ k2jc/ o)tszy

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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 c7cz61xyg w9v a,dkk 9aapacitor for a resonant frequx 6 wgckdy971aa vz,k9ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series wiy*fyndmjm 6 ) 4 u/t6/erucl2cth a 3.7-mH inductor for a resonant frequc tuu/4 cre ln2m6j6yfmy)d* /ency of 1000 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 resistor and apu wfy;mu4 b ;1jiv66f 40-mH coil if the resonant frequency fwb6uu;6ivyf pm4; 1j of the circuit is to be 1000 Hz?

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