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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 m;ezodchyw. psgp18* fne h6u c14+bf (7zo 2runits 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 indujincq13m(aez64u5m dction 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 coil produces what kin4 bas9572: f5yfdl(xlt jcuzgd of change on the i a:jlu2fsb(t7fc4 5lx95gzd ynduced $emf$, 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 magnkhe.2t9 m 2yhvetic field through a loop of wire produces what kind of change o tmv9y2k h2e.hn 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: wu8c )zp8hvn kind of change on the induced8:z 8vu wc)nph $emf$, 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/npfvwq 39n.d + (keuy 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 currel+femcq t9c+.r5kbt.d8c+q vnt in a conductor will be dfe+v+ qt+ lmb c9rtcck5 ..8qthat 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 is held above it2xtto 4vvs t,kb9x( 4us center with its north pole pointing down. The stationary magnet induces (when viewed fro2t, x4obvk9stx 4vu(tm 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. gjk1 u;j 4ue( whdpq+9 A bar magnet is held above its center with its north q dwjpk9 u4uh;ejg1+( pole pointing 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 reg cs7 7*l5iiki(;eqmugion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fiel u7 i5;gicqi(ksel 7m*d 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 whervw+n pmj8xv3yhl4s5*q9 zp t/e the magnetic field vector points straight up. The magnetic field suddenly grow*p8 v3pw n9 lhj+sqzym5/ 4xtvs 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 where mwp wx7-n+(mqthe magnetic field points straight down. The magnetic field disw - mqmp+7xwn(appears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing c 6hs4hr cmxr,u cy:.gf x7zx:,urrent northward. Two coils of wire lie flat on the table, one on eithh7rf g,:x shy:,mr xzuc.4x6 cer 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 nutyk4) 5xz7 czorth pole entering first. As the north pole enters the wire, the induced current wil7xy uk)45t zczl 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 w )tg( u58ozkdangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wwu(k z)8odt5ghat 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 rotatedx;or6uqj hz1 ow+n.(z at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic;or+hx jw nzo.61 z(uq 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.cr5f ubdv)c(a1i;6n) 8bo;gku2j bvu
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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 th,qcea2*0ux w,d )cb9itu,bj lat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetr0t vn37h *zfko1a d(gp1 j*yqic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwx g:us k*4r:ehu7n3s bard at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod. s47 e b3:nx*rukgh:us

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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 veloct0+ 64yz, 4jotj ,rt m8txpwdcity $\omega$ 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 transfo sb;h si4ffnl+/ b/d:srms

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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 second. The frequekxcr m8( c +p79ge(asqncy of th rsc9g+mcaxpq(k(78 ee $emf$ 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 devmu(5a hz qoy43o10w )dmmt1jrice 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 dev0il-v;w 2 xu cw cb5,9+vpjaivice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loopu0e ;lyjv -h 1v9e+b1xm 9iluts than the primary coil then it 0 telm-vi+ ye9 hu1vuxj1;l9bis 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 primxj klb t*84+ hnrj29mzary coil contains more loops than the secondary coil then ih8knzm *trx2 j9l+jb4t 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, thmiy-yi,/p.frok4ohk u,j( 7r2 vl7zqe power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuiuv3 k o2 sz+n7*hf/oao-o s5yvt,

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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/ke x82u3qw bn ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage q n83wxb2ku/e 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 t g vlq00ulx5;k f(wme2o an ideal battery of constant terminal voklwq5fxu;me(20 v l0gltage. At the 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 with l9wau7 /l. k .phbae6kinductance 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 cymn 2;rrz5.ofvms: *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 con( jo9mro q1nilvo e968nected in series to a battery. The time constant for the circuit reprq 6oo9 j nmelroi89v1(esents 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. The battery sqr 7f3u: bh4t )(xxx fb)urt47zc6nyis suddenl r7xb)xt:htxf y )3cqnzu6b7 u4(f sr4y removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units e 2.9ywgsk2 ; rbtfb2zdxcept:

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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 current :vfh0+mnguenr 6 3,ih

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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 connecteij 3m eg9rkr6h-21xun d to an AC power supply. In this circuit, the currenrgru91-e3 kx2jni 6mh 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 whgief mbu (1t v;z*o5l2en the frequency is tripled? vzi5fgl1(o ;e2ub*tm

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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 inductor is dyvtzh:2;oupap-k m4mwmk 3q1s0()xzoubled, the inductive reactp y :zv124)wmoz-u0tmx hsmkak(q3;pance 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 efj;9glwe+-e c0 6h-gfk+l iv AC voltage across an inductor approaches zero, the inductive reactanc+cf9j; 6e g-i-gf 0 l+lwhekvee 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 connectey; el/ pcybyc0 *pz-gv8bq 9,dd to an AC power supply. In this circuit, the curre b0;pzv8py cy,dlc*y/qeb -g9nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when thic1)jj ae0j-ve frequency is ja -j 1ev0jci)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 acrossh8,a 7tthw 6mbtbc :8m a capacitor approaches zero, the capacitive reactance of that ca ht8 8mta6c, :bwbthm7pacitor

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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 ca8 b f0du5dqer3pacitor in a RLC series cirfrb8uq 03d5decuit?

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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 defined tjslu*u3b,o * 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 co)b.ts 6p(bieircuit increases if R increases. Wh.i oe(p)b6 sbten 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 increasn/2vvr ilgc4o g;8b.u es 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. Th/)gkb2gc-n :indmnr-ni o2lcj:e )5ie 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 it/km9jk1x,gq x5 aao)n an LRC series circuit, the resonant frequency of that circui1qkajm,5tak9 x g )o/xt 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 voltage. At restf,qz;ijgk 2 ss)t),i;mav l /onance,

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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 ciqb a0wfrudvwe;fy1g1e5i8,: bqi: gbs4 k50xrcuit 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 i(6.ej 0kbu l yo8a7dia uniform magnetic field of 0.20 T. Find the magnetic flux through toi8 akb06 eyi.( djl7uhe loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating inkb2e rdc qj(7- a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lebqkr(7j 2 cd-oop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of i(f2cb6ajq9p,/ms v i0.20 T. Find the magnetic flux through the loop when the plane of the loop and thej/m cbf v(,a6i29sipq 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 reduced5mpiz0eg;o8 v 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 4*5e6 /u m/h lu0zyzww+zay.hyoc.v z$4.0 \times 10^{-5} \; Wb$ 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 squa f9 k*ouujhd1rezo7cv ewly02-.z 4z: re frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. e z4o.eyzuzh21d v7 9rklc0:uwj o -*fIf 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 ai ,;k+ br9th2a*lrcrend 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 anvqh68+ds*,n b8gjxold 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 60 m flies horizon6z 3o *rvsf*cdtally at a location where the downward component of the Eartz o**6fscvr3 dh'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 rotatessyjs1zl m p85kk.r1baz+ y1.w at a constant angular velocity of 2.0 rad/skj rsz 1bz8apysy.1+1wlk 5m. 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 loops and a cross-sectional area of d+-cryfnq: 0q 92pnx btrm9 ;w$0.25 \; m^{2}$. 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 100pwwnk9d7 s3n+ 4p oko2r4pib. 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 rectan):q kh+nxv 6 *gke,ltjgular 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 rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axh ktel*nx ,6 vj+)kq:gis 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 omqy/wf5b,g 7o ajm 8zd7( tw:jf 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 construct a simple AC generator wi,0/sb)ny*hpq + o;7rpujdv bith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availu +dj )pv;hqorbib nys/,p7* 0able. 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 w8rufh0 za3i.+m , hzm- p,pfbrith 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 resistance3flwen a,eko0l3d 5e1 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 We:4r ,gegfw 7hfy-0ka. The motor operates on 120 V AC, and when running ae:wge0 kaf,rh-4 7fgyt 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 connyjt)3flpi dgs0h aqn,:08 ) ojected to a 24-V power supply. The operating current is 1.0 A. What is the start-upjy fdhq:)o 30,t psnl iag0j)8 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 is connected tj3 jy:jn0fb h+o a 24-V power supply. The operating0yjj b+3hnfj: current 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 ;q, ajtn+i1u q6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back i, +qunt1 aj;q$emf$ 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 ne m:ve6y 53w2bz+zu zpd6:vrqkeded 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 nkry 0b2* h0mp6rn tf/*nji) u14 A to flow in the secondary. How many turnsfm p r 6tk)bn*rjhu/y0i0*2nn 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 24g ogm ,dunckyz4hy 37:,,/quin w89 4vlw8dax-V secondagiz y7/ y,g8hnwx4ou, 84ulc q9knadw3,vdm:ry has 100 turns?

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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 prx n3a9 km5(jcul 3v)14ok;jq.bdcfbv r pn70himary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curreku7pcjb3ajxf30 vc l vn dhkmq.();9n1ro54bnt 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 transf .a,v-wl bvjh41*bxb1wo- txyormer. Assuming 100% efficiency, how many amps at 24 V can flow in t1oxw b1vtb ly-b-4*xj v.aw,h he 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 neo4um1q r u wj(1(vrqe;an sign transformer provides 7500 V at 10.0 mA. The pri 1;(qmu( wvu4rajq1e rmary coil operates 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 turns on its primary coil and 300 turqr0zi 00niguso y)l)(f7qm0k e rp (k6ns on its secondary coil. If 120 V 0mz iqes00ru7q)oiy0 6)(g n f(krlkpat 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 tu/q- zz).7mt w7 hgmipsrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thezi/qsp)h7 7t zmwm-g . 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 trawueaq2rim,. 3p h2hi4nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outh4 impw.u ,22irahq e3put 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 itskt sq 5i6lbyo 3bgx (vl/ o0+rr:my9-r secondary has 200 turns. If the input voltage 05osi- trgbro+/yk (6lyr lqx3:bvm9 to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a trad pvz:q 6ljn+0nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of then d6p0l:jz+v q secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step6kziu3xx fw,mh - p,0gped up to 4500 V by a transf iwz-xk ,0f6hp3,mux gormer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current /7ky tbtdze*1 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thro /1ebty 7kztd*ugh 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 voltag-9lbugzuz6 l3 e is usually stepped up to 4500 V by a transformer and transmitted through a power line of ug6bz93llzu-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 re7m-i z1qg- is/kfb cv/yoc0(g sistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heat 1cgq - symo/7(/zi 0vbkfg-icing of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of; ;-eyhk8+n m(evfmhy 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 ;8(-y +fm mhv; kyehenof 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 ao 6p7(f amxr*jslm 9kjc a4f;9t 1000 V. How much less power would be lost if the power were tcml*s9akfj;f(aj6 p o4x rm79 ransmitted 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 atu gea x8y9n27r8ih0if, 6yngz 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the gen8a2iyy h 8znfn079urgxi6ge, erator 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.,c.qfs7lkv 1s How much energy is stored in the coil's magnetic vs1qk7c,fls . 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 6.0u :yfulmw-ma :1i(fc /-W resistor and an 18-H inductor. What is this circmam/cy- liwf::( u1uf uit'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 circuitdti)u)k/wxpg1np dlz 6 xz2 (( 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 outlet. What upi6 .scf1m6c 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 a+y t yg6q+9mw120-V AC outlet. What is the resistance of the law9+y6ga+y mtq mp?

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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 conned0a 1fql ct9(*4(bp:owt yd zrcted to a 120-V ac power supply. What is the peak current thdyc :a*orfp d0 b9(l4t(z1qtw rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dhjl5n 6 b;7z our0p(* vopph5piss* p u6n;pzh5oj0lv7 (5phbropipated 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 xu5h +jzc05sp50-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-. 9lds xrrat- /:x po85)payilW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re 0e.dnjzb f3y.sistor 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 i. 1lbd:tarb a*nductor 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 (*6gi .iu li3ssdyxm62.50-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)+k u44l;f je8ang u*d.cw ca;yce ay6.0-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 157p n ,38ys1fe74vpir (fsrcpb 0 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-mpz; 7 te6h1)xvvoxu;eH inductor when 120 V AC at a frequency of 20 kHz is apu7 ;1 6) tvpeovzhxex;plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 1ic3s/:fugbbj va 8)p5b g-2cp v ns(m+10-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 capabf.h igx 6*qibb6r 3n3citor 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 capaci1u:b8f izf0ht l7+z+8jq mfx otive 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 does a 10-d k;j 7mq5z 8rr-o6nyomF 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 cz1;hmk( pryqu32ni7wapacitor be 100 W?mkz 1 hqrn 2(uiw73;yp

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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 0.00p eaeqsr5p9o,e -8cj510-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series po)r. - lwxhoa/xvv*1 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capa /l.oxpvw )v-ra*1xh ocitive 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 i,969;y2ff j ea njynpjf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serijpff2ay yjne nj69,;9es?

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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 resistouuz*4ctuu/ h2 r, 20-mH coil, and 1.0-mF capacitor are connected in scuu* uz2ht4 /ueries?

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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 fpr1r9v1xsp9x sd9y-is connected in series with a 20-mH inductor, what is the imped rfy- p1s9 9sxrdpvx91ance 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 conne n u4,8wcgon3 4k.rsypcted in series with a 20-mH inductor, what is the phase angle at 100,n3gows8.yp n r4 kc4u0 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 z,f q4cda(vi3ejp52l in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at pv4lj(3dq5 i a f,2zec1500 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 z k bv8hptj+e u;vy*zc.15hl4with a 100-W resistor and cb4p* h5 z;l8kvj +uv1t .ezyh15-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 seriesg dd33zdy qk)x0km*1b with a 450-mH inductor at 5000 Hz for a total impedance ygxq1*zm03ddd3k ) bkof 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 seri5cdf8g; io bq6r6 p4eptlxnt1 e3pqu4 6q1wm3es with a 100-kW resistor at 1.0-MHz for a tot656mled quip6ox3 4rb q4nq;f8t1ep1 g w 3tcpal impedance 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. Whatmkju8u*g tvvc x,9e 4:o 5qd6n is the impedance vo 5xq8*4dv6ku enjc9 ,mgu:tat 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 in series with a 10-mF capacitor at 1.0 kHz for k v hbl4c/g9qi c:01 oqnmt0l)a total impedanceq1to4 9c/ )0lvk 0qnilgb :mch 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 for a phasu,m 7k xi87b *so7eo-7e9jb w+y pzgkge angle ou 77k+mbj ep8b*zg 7xg-si9y7 o,eokwf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W renda px4eva6u ffn-1z4i;bnx + t 7(wk)sistor at 1.0 kHz for a total ipavid6 k7f(tnnxne4b;4 xa 1+fzwu)-mpedance 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 120 Hz. What is the+g xsxx t3t((;r :ajvj phas3( gtjx t;axvrsj(:+xe angle?

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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 re bzcov*ah6ffx8;*lkdrxf .-7sistor, 20-mH coil, and 1.07l bdxxf;-f.z *h6afk*v 8roc-mF 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 c8voctk ( dk*veq+bdm6 z9a8o;apacitor, and a 0.350-88bkdo6v9mc ;qa v+ez(* dkt oH inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactan+ybm-vphhfps- 3 k)o hz4lh 5*ce 30 W, and an inductor of inductive reactance 30 W are connected ihb-+v3lmh4f ppho5 )yh -kz *sn 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 containing a 50-kwu.jyb my b2 o9vcy-e83.9mhb qe;e1W resistor, a 10-mF ca w8-b.j9b1cehek9 uyby.m3 yoe2v mq;pacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor h7bagqh(s/*jxy .q7 n for a phase angle of sj / hna7(ygqq bh.x7*$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At weszd3x/3( 5aspovqm5d r 4sl)hat frequency should thex/ 3(azde5)l ds 5vpo3sm qsr4 circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancezvr/b87bnsf,zt: 5 hj, 15.0 W inductive r8z/szr,jt 7fbnh 5:vbeactance, 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 an AC c 9-j7akexwlqh9 p89vtircuit 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 resistance of3mg o/hn- qed4zxb:)m 30 W. What is the power fe m)-n gmq/4zdb :xho3actor?

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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 dqumk, 0c 1*xeRLC circuit containing a 50-W resistor, a 10-mF ckcmq1 u0e *xd,apacitor, 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 frequency of a 1.0-mF capai3-*lc2 yogz6sxj ys ;citor and a 15-mH coil in series?*jys 2;g lc3s -zyoix6

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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 4.7-9urnw9g 9mik9e40ulmwm1 sq/mF capacitor for a resonant frequency of 10ulmw0 krs9 g 99e1q wnm9/4umi 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 witng5 8/f htkjm(k w*,ql+v+3sdx2c we kh a 3.7-mH inductor for a resonant frequency of vhgf mwk2lstj /+ *w5kqn(c83 kde+x,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 with0)xcu ovapv61 a 30-W resistor and a 40-mH coil i)ov0a 1cxvup 6f the resonant frequency of the circuit is to be 1000 Hz?

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