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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 are9a3 zk n6qgnw(6ikyu) 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 induction states that the af f4sm 5( .uuulrfn)7$emf$ 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 inkre gct, d*5yo *:uhr 423aiv0b 8dykv a coil produces what kind of change on the inv *vyi8,h cy4r 3t0aur52k oekdbg*:d duced $emf$, 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 an y2-xce z v1k 1zal)gth6t.nnu0h 4f4 loop of wire produces what kind of change on the intzh h.g14c064nl 1tvzf-uykenaxn ) 2duced $emf$, 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 5r+/grin (rjkl15 vnrkind of change on the inducr j(vkrn5 +lrr1n/5g ied $emf$, 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 magn83b u, 1 e jb*f /*hkpztcz8hl06dursfetic 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 g3k nd2ct+) x3lm)tladirection of an induced current in a conductor will be that which ttng3lm)tx)a 2d3+l ckends 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 tablksrhpy,3t 9h ncy61( ke. A bar magnet is held above its center with its north pole pointing down. The stay1hs9 ,yc6khnrkp3 t(tionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a h vlnt yk4; /fcuvm x6fl81lf z2./d8wnorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inf /1 8; v lfuvwfy.8t4cldxk 62n/nlmzduces (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 the magnetic field vector p viz88 db-y g,pkgp2voz41 hx5oints straight up. The magnetic field vanishes suddenly. When viewed from zx od8v zgh5b 14 28py,-kvgpiabove, 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 lpzd ; p3z5:lm/.bb orfevel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe:l r.;z3doz5/ mppbb fn 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 the magnond t16,p xc)ketic field points straight down. The magnetic field disappears suddenly. When viewed fromdpnk16ox,t) c 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 h+;yo.g0;kg hemc:j z uorizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the 0mg:j.ckeguyh; oz+ ; 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 wit; n2/0wzpp vtsh the north pole entering first. As the north pole enters the wire, the induced current will bspt 0;/ znpw2ve (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed arp7 xgyo.plvq*e hi sazw)te 9 (97 rleo.s219bout an axis whose direction can be varied. In a region where atr(19h qv 2zil7.g* ryasee)xw9o .9 el spop7 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 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 speed about an aqs+td0g9 hb;pxis 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 q+ s0gb d9pth;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.+x3fisyno8 ; z7qsx(eg +q r6d
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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 t7a;)hmh 2v we6wr8b jdhat 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 magnetic field. Thya qy(oj vjakh*x/ 3,jefd8 8.e $emf$ 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 nox ql7stxlx (q(1* pg+dhkll 87rthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potq1+x ( t(g *qpkhllls lxx8d77ential 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 velocityv w z/p52u -l6 lcug2 y(nic hdf7nb764m.vfwa $\omega$ 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 generatoqnn,) u ie5ef:r transforms

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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 throughz0zjmfp.v9r - 60 revolutions each second. The frequency of the zv90p mr-.fzj$emf$ 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 decrjmw pn1c( -1vice 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 tharz0 g9yr*r:92o (to wy, fza cwxmj(4yt

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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 -jmu8kr klx4 *than the primary coil tr *4-kj k8xumlhen 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 seco qtq :b/m7z srpzikh/)b(/+pjndary coil then itz/ tbp s/prqj/ikh:+7qzb() m 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 ztq:7w)t q-xginput

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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 cir1fa:u rvr *+hrcuit,

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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 indue pp2y4 db:tg-kjdf byk ;)44uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resb4ej g ;4kbtyu-yf4k 2)pd:dpistor 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 cl(j*-a5i4v al 2sbdd eonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indu lbjidl4 (aev2 as-5*dctor 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 withc4 yd m-.*wjzm inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and r4kielgziv :w01qa3t 8esistance 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 connected in series to a battery. Tcan* w 0tqv27c.v6j iahe time constant for the circuit represents the time rci.ja ca*7vt06nv 2q wequired 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. mvko6.ob ea s400:ukcs5o )vg The battery is suddenly removed from the circuit. The time cobc k:)0.s6ov4ueso gvkm o 5a0nstant 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+*pxt r3 :a/qvz4ct mgxcept:

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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. z6x sd 4/ocvx,7 atd)f On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply.g89b3vd gnp2xyr. 0qa In this circuit, the curren0gnyvr.p3dxq 8g 2 9abt

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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 factor0;u4z77bubu i j.n g ,;tquyai when the frequency is triptiu qbb. ny7u;0i74gu,j au;zled?

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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 volta.bw,6t81w1r rvr d f)ab jwou(ge across an inductor is doubled, the inductive reactance oj1a u1)w,vfw8b(dw t6b.r rorf 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 g6-a5m: z7 rxzh-rxk;z.l g+idq8w hyacross an inductor approaches zero, the inductive reactance of tmx. rlq-zg:d5-x7hiy8z+ ;g kahrwz6hat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power su5runs55n9ex pd1 by6 0x.uw x0le k(wwpply. In this circuit, the current.x1 0 9nnkx5ew r6uwsel5yw 5ubd(x0p

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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 mvxm)kl3nw85p+k;xl2q j 1fewhat factor when the frequency is tv 128lj)l;f q3kxkmx wp+5enmripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero sqvh 0+x l r.gxw69)+ess2ige, the capacitive reactance of that ce96vsiel0s.g x wqh)s g 2+r+xapacitor

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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 e45i6vs2 7 hw mwvpmu+ vuds(4voltages of the inductor and capacitor in a RLC semi+ pv7(2su4h5sv wewm6u 4vdries circuit?

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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 RLip ; cca i.d7er,yzwn 09us5-yC 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 i86i*wvx.k;xe rhiu7rn r:nd 2mpedance of the circuit increases if R increases. Whwnr:ri 2.8hi neu 7xxkvr6; d*en 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 ci/l4 c l09whwgbrcuit 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 serie2ifsudw t64s -s circuit. 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 a8;h/vux)yf-ualnn -n n LRC series circuit, the renuxy--/8nl n) uah;fvsonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance,1ygpj i*-/ 9urpcccnq )u , ui6rrd+h7

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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 hh gxp; z21ughld8u j,d+m,z) 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 wlm qpaoc:,-, of 0.20 T. Find the magnetic fl-mwpcol a,,q:ux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota; r nb 82gjozki,.lu:fting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh:l2 jb.r,ifz ngo;ku8en the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is ro- 6bsk jony*3a.a*vkhtating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ankn**bajo. -a6 vsk h3yd 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 sinyo2.lk t p,vuu2x a-d*gle 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 chanrqpl:x:8gm .u ges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a jl ;hlu 3;gi4s+onw*ssquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the po 3h+ilw;4 unjslg* ;slane 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 tt yshm/80eijt9x r)4jurns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar:7 :xitvk y6,z ufk0ovea $0.20 \; m^{2}$ 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 flied: 8a5+h uitjbev 6a- ly.b-vns horizontally at a location where the downward component of the Earth's magnetic fii :h-jv-nvu+a y68db. bet l5aeld 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 lonles2km-l f.h+ v-qfoxgz ;9: sg rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic:zh v xgoe2kf9s;l qsf-ml-+. 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-sectionaz78*b7ygu saa(rh v. /x pfj ;f((;mhhy y3ivll 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 wir/0nyos6z5rbobw ,8l v e of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lq5qz +y) eptk0oop is 12 cm long and 8 cm wide. The0k5 t zp)yeq+q 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 turn st:0)o e6vd1 c3tcajv+.k 9kaflprt- s 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 co hzm2z3bkc.p0k1; vv+eb-t ynnstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the roke3mvzh.; nb+yt 1vcpb-k 0z2tating 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 maximumhx6ct6+3na gif*,v5o p hpx)j $emf$ 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. Thedn,v f59 xje39t3gp(h dfp ie. 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 o6f2vsokd / 5kgf 6.00 W. The motor operates on 120 V AC, and when running at full speed it generad25 6k /fvksogtes 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 resisz z6p; k.h h+5r8bji34aol1hx 9iui iatance 6.0 W is connected to a 24-V power supply. The operating curroj8z4l+zha1 h.xiu6i3 ;ibhk9 ai5pr ent 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 is connected to a 24-V powe9, nvinu9v,qb fyi5 ;rr supply. The operating current is 1.0 A at full speed. What is the;nvib5y v9, 9fu,ir qn 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 c vr5*ues6wf:is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thec5 6s fu*re:vw back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is ns2k2 e (jg rubs-35u5r)sgobteeded 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 14alnjh:v ;38; vca*, bfveld9 o A to flow in the second;vvo ; hclf b*3aaenv8jl,: d9ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necvor5;; kfzj*k tns 0n*essary in a 110-V primary if the 24-V secon0kk * o n;5rzsnfv;jt*dary 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 primary coil and a 2000-turn seconwbz r(nkt/n/ w557 eggdary coil. If the current in the secondary is 3.0 Abktwe/n 5r z 7ngw(/g5, 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 o1fkz9g0;cjeo m9sqs: f a transformer. Assuming 100% efficiency, how many amps0e9q kcgj19;o sfsz:m at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 j4.t t.gqtv qhv d388m .orik6V at 10.0 mA. The primary coil operates on 120 V. What does the primary dra48qjh dg63orqk t.tm i .v.8vtw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer h0 3 e,gpl *b heu5.ti2ypec:pafw7yx+as 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A yx *wftpgu:a+cel2 . y5eh03eb7i,p pis 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 3008w0incejrn laq.7h* kpk z5 q -,*hj9i ffx9u+ turns on its secondanf z-pn8*k 9q5rhu hqlak7.cfjwxe0i+ j,9i *ry coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1 z e,6qz5.y nlz+.nkfgv81b jp00 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondarz p 8zz, j +1v.6lyk.qfgn5neby 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 tra f k.r +dzjgghni4bg,17do5 q(nsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary 4h,.gk nf5zgjid(od1qgr 7+b 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 sec-sm fq8h*j* fsv. rp3dondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpms *s-3ffhrp*qdj8. vut of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The 1r kmv4/xgju4 voltage is usually stepped up to 4500 V by a transformer and transmitted thro4g vkx/ ru4jm1ugh 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 at 120 V. The bfnvz7a g6 -:4 kmrr0mvoltage is usually stepped up to 4500 V by a transformer agnr04m kr6vmf b7:za- nd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current 9y*8 pif5ysmz pswpv7k z9* 6yat 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 transmission line if the voltage is not stp98 *pksyz pw9v7y6mzfis*5 yepped 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 ha+h6f,gqd:1tjo ery1w)ti 3o: hddzv* s a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heat 3q *zoh6owy)f:1:i+1 rdjdedh, ttvging of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A u 1 3(+nzx .x zmpljx6/zluxx9generator 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 u63p1x.m zxxx( l l/n9+uxzjz100:1. 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.v2oyc )c4 w0ve How much less power would be lost if the power were transmitted at 3000 V inste ce 4vwv0)yo2cad 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 p:/s ahw+qzgm y)oiu2 z8e41ctransmitted on a line with resistance of 0.60 W. To what voltage msm:pg 4/ 1uya+ozeiz hw 8qc)2ust 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 ener-d0z6z l a:ztxwy 4/hagy is stored in the coil's magnetiz6t 04hyzl/z:-aa dwxc 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 l;f ommca9 e(r9nxx)b1w ;y9u 18-H inductor. What is this circuit's time constaa;99rlmx unme )1(yc fxo9w b;nt?

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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 cir3) wr.ysl. xjv w1oq*jcuit 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 i5-qflcm,f c63mkwi l3 s 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 AC3 km- drg*m*he outlet. What is the resistance of the lamp hmmde*rg3*- k?

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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 the prvq7)na b2)/c cpl8 jneak current through thebpnlv27)j cn ra/)8cq 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 tc t15n0c cd2eb07cceuhe power dissipated in n520t 10eu dceccccb7 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 resisgd+mq(cda0udq *g63utor 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 resisu:qu w0d0 j;;p1 pyxxrtor 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 50jj7l1 zfyd h7+-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance o r3ixe* ,gl6tcf 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 2.57h vj ib 8f798.cj6m0brp eyaq0-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 bk1.dw as g4j1ixrn 7pf;5 (kta 14.0-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 at 100 w2+1 -at eoqh;- lgq1pijgjo-0 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 ia(1xh g57hp,eqakl mek)v/j xc j. 07qnductor when 120 V AC at a frequency of 20 kHz is ap5q hjx77jx0/heapv.ml c1a gek(kq),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 a3gh6o usq8+ ir 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 mway.:wc.8 x.vqc6lb /e;n fm 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 ha; *,wjl,cmvxh/foh i 6ve 50 W of 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 does a 10-mF czsn tl q7lrl)(-l(7s,aanw q1n-xf 8capacitor 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 capacitor be es/jky*hcu )4of49s h100 Ws4 )j hsu*fc4hke y/o9?

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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 thr ch6qc(epox// ough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series mu.9n vmr gx go4 k/6(fq4:fuj dhi9n0circuit with 12.0 W resistance, 15.0 W inductive reactance, jq 4 :mv 9(h6 4nnx/.0ffdroig9gmuukand 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 g6i u(lv. vik)1wbkj6dbg) s6at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serv. 6gbilj d)k1u)6b(k i6gvw sies?

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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 1500yk1 r0;ql4+i* t wgw8s i1a9fy uo9ifey5(ahr Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cae0*q+(h 1g;fkr t45y i ya9l9asr yio1fiwwu8pacitor 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 -ofp(avftb8 (s1(z wlconnected in series with a 20-mH inductor, what is the impedance at 100s1fo-(lfw zt(p8(avb0 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 s.4r epgd.jw/ k*t4sfx eries with a 20-mH inductor, what is the phased4/ wks.pe*x r4ftg j. angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series cir8zepcf+7 1qbpamhh.n v;-0 nhcuit with a 20-mH coil and 1.0-mF capacitor for a total impedanq-8 n0zehmh+1 ;p f npcavhb7.ce 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 net 1nl1;d .qgcvd.l; jf5k6w ,q 6jipe:w 8ehbteded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200 j8ped ekiwv ;wjl 6 h,t6gqt.qf; ndl51c:.1b0 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 alpnt,z73+sia total impedaa ,tzs+7 p3inlnce 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 pu/aoyz5v q4sb o;9 jvi2t in series with a 100-kW resistor at 1.0-MHz for a total impedance of v4aqs9o/iz oy2b vj5;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 wit-gf(c56 xyd tdz3/e ug+ dcut/h a 20-mF capacitor. What is the impedance at 1000 Hz?tu5 d xcdg/-g efd+y36cz /(tu

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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 -yfa ;(tfrn; gat 1.0 kHz for a total impedance of 45;ngr;f(t ayf - 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 10s 8 *qy,ee)jle-mF capacitor at 1.0 kHz for a phase angls qe8*)jeel y,e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz84:8frp gg* hfccp,zg for a total impedcf *pfc 8ggrg: h,z48pance 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 isyoodsu9vg0)9y2tcz0 qr- y,k the phase angl9sy,d0 9 uy-)2r tzo 0cgkoqvye?

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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, 2l3b22 f ;i1)vzuwoj zdmms6 6r0-mH coil, and 1.0-mF capacit2z wfr2 m6o u)lz;j1sidv6b3mor 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 capacitor, and z 7hzb;(6xrdni ;w,lca 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powerx ib;zh,d7c(6w r;z ln 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 reac i3m0pt*ox h9p. lyh/ntance 30 W, and an inductor of inductive reactance 30 W are copnlt /p3h*. mi 0xy9honnected 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 angli 6i*qg5.jyh a+mb4dw1 np7ohe for a series RLC circuit containing a 50-W resistor, a 10-mF capacijqn6db .a5+i41 h*ymgi w7 hpotor, 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 mj xowfq/ni4ad-0kc tq4- r2;for a phase angle of t-wx2;-k i/j 4coqf4 an0mdqr$40^{\circ}$ 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. Awofbs5xe n: y+c(7 +ku-s+:k koou9jqt what frequency should the circuit be driven in ke (kso k j9-:uswfonu+5qy7xb o+:+c 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 resisccwh-zzd xmx7+( (2s ptance, 15.0 W inductive reactance, and 10.0 W capacitive reactance,cwzmh -d+x 2cpz((s7x when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is,dlu t;ok7ul5q, s :dw7zlp*0(vwrkz $63^{\circ}$. 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 ani)3b 6 b,blaa xh:j;ird a resistance of 30 W. What is b3i)a,:abrhl j;xbi6the 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 fa cry5p-p*d 2 a41t fe,wskqdg0ctor for a series RLC circuit containing a 50-W resistor, a 10-mF d41wf- prc*yps2deqt 50,a gk capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequu// g(7ro:bo3q m rutfnsw42p ency of a 1.0-mF capacitor and a 15-mH coil in series?s /f uurw(n7o:bmog/qt3r24p

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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 4 sysk( bl2j 1okd2k-dwith a 4.7-mF capacitor for a resonant frequenc-yk ( jb sl422s1odkdky 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 with a 3.7-mH inductor for a 1n5 .s u -m8k)vhzk*sxm1bdqvresonant frequency of 1000qm b1.m skzvnh8d- v)s*u5kx 1 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 o;,.3wq q 9sohcmz4 heresistor and a 40-mH coil if the resonant frequency of the circuit is to be m9;owheq zho 4,sqc3 .1000 Hz?

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