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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 ,ajq1dz 4yl.jj1 rfuu ct*-+aunits 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 inducc/ s)cu k)w9pw5)eqp (9yk qfvtion 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 le(tp8 qa0iqlhwv6+.yoops of wire in a coil produces what kind of change on the indy8 v (w+6 qipla.qeh0tuced $emf$, 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 of4a8zo u04ls;qcott(g the magnetic field through a loop of wire produces what utsza ;to(8ql40o 4g ckind of change 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 loop of wire produces what kind ofm;d3f7g f8i/de sckx3 change on the indu/s ex cmd;df73i3kg8f ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnet3pcm mfp0.5i, zp6nslic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor ksz vlrq.;o-i3ql v9p6d:g r5will be that which q.rqivlvdopkl9s: z-r6g 5;3tends 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 abov mzr.3r ;)ejcqe its center with its north pole pointing down. The stationary magnet induces (when viewed from ab mq ;.r)ec3rzjove)

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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 magnet ifsq6yme7;/t jp h6kq 4s held above its ; e4s 6y7h q/p6jkqtmfcenter with its north 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 tab.qfnl74yc2/.hlr4w gr2 ec xble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the syhl4cl/w.exg4 qrc27 bnr 2.f ense 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 reg5 z9 9ialvi+e lfxaj6md0/vz7ion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in az imi 9zvjxdl0e/75f+69v la 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 regio(*zzhl1 ik8x 0r yxrb6n where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directix(rzy ik6h80 blrzx*1 on 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-increa ,o8 f z3v7o/tg s,zbd+gdprt5od+5lising current northward. Two coils of wire lie flat on the table, one on either od/dvrb+5l78s ,d ,+o 5zt zpt i3gogfside of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole eq .a dtb1z(xhnk t v4e;07khj0ntering first. As the north pole enters the wire, the induced current will be (as viewed from 4 k0tzexj7dhna1b.ktq (h0v; 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 about an ai8*uqn 3ey ra6;qk (xk zujb3.xis whose direction can be varied. In a region where a uniform magnetic field points straigh83arybk z; i *uk6 uq(q.xnje3t 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 rf*m otsb6) c)+jn d mq8k0(qmmotated at constant angular speed about an axis whose direction can be varied. If+j c ( mnm0)8*s 6mmqq)dtokbn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.tp 0otv mifgr( g/wmgn1;(8p,
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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 mb0 t1t sh3f -ap7l-bban $emf$ 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. The zmq5 p :2-gl8fajqic5b8j2v+ sw jca8$emf$ 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 northward abx l;lu+ i7e)vt constant velocity through a magnetic field that points straight down. Make a statement concern;7i+lxbu el)ving 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 hidx 3;,thaphy ,h5d4y4pqz 9o i3i1x angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorqz i md c0)dw9x/*sskth6h30u 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 through 60 xxvky.,qbidftq3 (3d o((eq6 revolutions each second. The frequency of tyd xivdqteq. fo(63 b3,qxk( (he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device usecjmzzb2 )awqs4g w 9e6njv0g1 )ry1:f 4 qn7and 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 thak9by72*p9zwrh 8cy/ zdq xnq2i;1d mxt

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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 secongbz2u m4- hr);5bsjgedary coil contains more loops than the primary coilr z5sb-)ejbghg4m u;2 then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary cowijqwc77 t4r3bha4c2 il contains more loops than the secondary coil thenw2t44i7a ccwbrj q3h7 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 im*0,u sott dbh:-7hlf nput

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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 ci wef(am(v 6yq/* u(flkrcuit,

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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 serietrt(l se ooz5+v0d7v ne1b 99gs to an ideal battery of constant terminal voltage. At the mo+nl stbe79 gzt(ero19d v5ov0ment 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 a25* x 2c1b4d nzwd1jzpfgtynai/p/.q n ideal battery of constant terminal voltage. At the m/z2npt4f/5ja y z 1wn2 .x *gbdqpi1dcoment 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 inductance L andt;,vpnm8 rvs 4 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 in wl1ojf it38q m6r-a:vductance 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 ar-8uflt0e) f / id2mruee connected in series to a battery. The time constant for the circuit represents the time requirufu - m/t)2eedfi0r8led 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 a9tvnq2srdo .- j;f+vk9nk9sire connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time req q +99i okrt-nnsv9k;sfjvd2.uired 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 c6(sivuhpw -m-7-kj mj5zok5d u 7ma1the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supplyulc1 tjfn o7if90)m, e. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In th 8myq, )3f2bswdoexy hqq*1f6 k8kwi5is circuit, the currend58fskeyqqbkw )qo* 61 i w yhm83fx,2t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fp fzs t53r,px,fj d(dvy90qg6requency is jtf(g xy,5p 3 v6dzsfq,pr 09dtripled?

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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 acro(g e.u20obuyen 54cn jss an inductor is doubled, the inductive reaeeu4 52 yncbuj on(g.0ctance 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 a /q(( yh e+x- ,iq+ rtv/lkkg7rs2cyginductor approaches zero, the inductive reactance of tgr+a 2 r g kq+/qlc-,h/v(y yx7(stkeihat 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 connecnl9ay fkw+et 0yoz ((w,( bn+eted to an AC power supply. In this circuit, the curreo fw 0z(kn b,e eaylt9n+(y(w+nt

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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 wtb9;jr0p-cji sk ww, 6hat factor when the frequency is tripled jwr,cwib6 kp-j;0s9t?

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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 gclw pp6i+48uorx4x4capacitor approaches zero, the capacitive reactopw4 ur8p 64g4x cix+lance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor btk:tt5i*+d mand capacitor in a RLC series t:m+5kit *tdbcircuit?

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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 R:4gas g; ))b avqzayd+LC 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 circganj/5j ynm03; m2:bh*t jtya uit increases if R increases. When is thym2n5nj:*0tjbjg ;/y h3mat ais 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 th+uriq+ l; w)j9*u ol ;gexyp0he 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 circunkmq042wq.. *d lzavzit. 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 sermp52m0 bz rc6nies circuit, the resonant frequency of that circc0m2b5m 6 zpnruit 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 thatrdk. tv4d- w/k is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui3lpum0lx5kek;;oy6(jv g yw; t 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 rotat: kr:sky+r8 tning in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop tkn k8r+:y:sr 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 in a uniformeicnf7av ul5c4w +9kabm 95k ) magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoak kw94vbucie a)9l+m7 5cnf5r 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.d ;cccw c-.gunj hi6zz.yyt6 ;vc 0c; uniform magnetic field of 0.20 T. Fic.0dv6 cczcn.; ;.ijg6 tz- ;wcyc yuhnd 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 single loop is reducg3vtfzlhik+/x )7p 1med 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 c9hu 1q0p wgihg8x ey8fd.k5*hoil changes 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 onp9b akgl+) ..wj vc4vl a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes un val)l9b.gwp.v4+jck iformly 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)qj:55k :birtsz :y8o:i b qrz 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 andw5j nt7) xf/dn 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 spay6ljb 0 gz7l1g 98ui6tio 5iosn of 60 m flies horizontally at a location where the downward component of the Earth's magnetic f ulsi o5tj6l7b96yoziigg80 1ield 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 rhi0u (5acz7 tkotates at a constant angular velocity of 2.0 rad/s abouth75 k( tua0izc 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 generat fkk)*a-b:t nbor has 50 loops 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 of a82tus)/ x 8tde,u:c 3dtjtkg krea $0.090 \; m^{2}$ 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 yuvf -j)a+)7scu4 qrm 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 axis of rotation, what will be the maximum output volta)jvra)u7 y4-+fcuqms ge 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 ofh8+gl7)qh reqr0mpfj+ ro*7 i 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 witf, 2kdpf+yf0g h an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ifp,2yfkg0d+ ff the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum75cm2 fvs n*9r4/dyemlt94 kaqq/pmi $emf$ 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 resiga*zmv- 9 q.9byj9b0( zwfbmlstance 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 nmtb.. 34+o9zfs st,q vojwy2motor operates on 120 V AC, and when running at full sp24tz b ows,s.v.o9fyn m q+j3teed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected)bz9:l jn j p09,dcflf to a 24-V power supply. The operating cuj z9,):lbnd9fjl 0cf prrent 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.h*mm-ebmphod ;, :+o a0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed,* om;a-e mpo:hhm+bd. 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 a 24-V power supply. Th) *uhkx hu)s1oe operating current is 1.0 u)o *x1 )shuhkA at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reducewzi aa tu ylh0 cwrj:;7m0hgak44i+29 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 n)hemoh : uv,y kyk3+dn*2kva2n; -hwprimary of a transformer causes 14 A to flow in the secondary. How many turns are in the secon:a3dko 22w;)uh v h*hn+nmy,- k evykndary?

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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 man23ip+ ,(n xps-fn mltgq 8;kjey turns are necessary in a 110-V primary if the 24-V secondary has 100 turnjft(gnpl8 3isme-q ,n2 ;xk+ps?

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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 secondary coq 5y*bdt;ka crz(n p2 pp179vjib p * jyn(p579;v1rpdak2qtzcl. If the current 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% eff j(uuo5s8(u yz2k,hbficiency, how my,j(( ku 85uhfuzo2bsany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 1mk)1f iqi1ry 90.0 mA. The primary coil operates on 120 V. What does the primymi rkif1)19qary 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 w /r(gd*l;uoc and 300 turns on its secondary coil. If 120 V at 2.0 A is applc(*wgldro;u / ied 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 3o 5n 0iq q4kbuzvuh-,400 turns on its secondary coil. If 120 V at 2.0 A is applied to the primanoiq -kv, u5 hzbuq440ry, 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 1t a jhvs jym(2+lbi;(,00 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 seconib ,jv(aly(jhm+ts 2;dary 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 trans yczafi7o72* wformer 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 ofo 7 *icywz27af 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 transformer has 100 turns and its s*-*6ap4q g+ smatiwcg econdary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seco*g6c msi*4gatwa pq +-ndary 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 usuallgkbu6 j13dse 9q3 9kcly stepped up to 4500 V by a transformer and transmitted through a power line of total req3d 3u g9j6be1kl cs9ksistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s( v9-zie/lsyitepped up to 4500 V by a transformer and transmitted through a-si/ ye(i 9lzv 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 x30cbeq m j77o-vabk7kj/ta1 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is nobx tq7amo7/c-kb7av e0kj31 jt 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 totasj lqgq + 2x95tstez7wtx.l+6l resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percenta.5 t ttg+x xje7szlw926sq lq+ge 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 ha f(a:f l.csju/s a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stefsl /.a:ufj (cpped 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 lf zfhed7 k00w,2b4*upx 8re+cjgpd4wess power would be lost if the power were transmitted at 3000 V instead of at 1p,ehd+*f 70c4k2z0 xfdwpube4 wgr8j000 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 at599 gxw5n a,:1kwpj umeo j9wa 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power9p xm1wu5ja w:kn j9oea w,9g5 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 ar;g0;r w )gwu9uz.//fvpdpm l current of 5.0 A. How much energy is stored in the coil's gwrvz;;9lwp)f.ud /pmu / r0 gmagnetic 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 rc( ba) v3ros4(q1 madiesistor and an 18-H inductor. What is this circuit's time constant?voiqdb (1c )r(34asa m

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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 w;y gr*vvacq)3 here 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 ous, *qq2 4 mqd7mnh i/m)w8dnkatlet. 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. hj urgr6id;b x )x/f65k*n4 x28 lzyotWhat is the resistance of the larl x* tjo k6/84y6b gxfd i5h)xu2rn;zmp?

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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 co0;s ublyt fyh:) yp71lnnected to a 120-V ac power supply. What is the peak current th syy t1hy:b0)flplu7 ;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 co0v s gyjx4:z7tnnected to a 120-V ac power supply. What is the power dissipatg 7xtj0zs: vy4ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W+y ec wbajk*-*z y;e7g 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 h;(v,4sh9n va;ubnwh-W 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 resi iucqqf*t s*)*w,oxne 0dc+p (stor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hqd729xz fy8knwv c) c.u/c+dbz?

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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 cotyf8pg:op 5y- 0hkek8w20 zpx il at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil ha/.-;l6l qs 9 i9*lhfc tzvxcyrve 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 .0aos3uk3:wp3 v1w nx *uzux b+czc3a W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V ACjtbl;q+ i2:en at a frequency of 20 kHz is applied to i:2qt ;iej+bl nt?

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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 110-V, 60.0 Hz s hj9f6elursd/i 730yc ource?

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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 capavl6.p*,ca h dgbqm8u ,citor 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 zv3+ iomis .- j2xmrx1needed to have 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 capacitor have a reactan krkgiimt2m,d,2*c s- ce 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 capavqsry h1/m+ t3 f)z0 byxhh59kcitor be 100 W?mbrs9 53)hh 0+zt/qy xfhv1 ky

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 )qt b-jui xhq. 3fx.,lHz 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 circ9pzp7wmrw *vuuw :wh.p p8b51uit with 12.0 W resistance, 15.0 W indupww b .*9vu:pw7rup5mp w1z 8hctive 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 aad69tqfkdsu0wn ay* dx,sop) i;d +./ 100-W resistor, 20-mH coil, and 1.0-mF capact,u6d nsdq;*f x0daoa+ w/yki.s)dp 9itor 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 155oz1 pelo+y :efr n4s100 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arzr1fepeo5+: oyls n14 e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ink :j 9fkthbe1)ductor, what is the impe:fkt) 9 kebhj1dance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what-9*gtkjefa*f tmmt4l zhe7f b)iu0.5 is the phase an.ie) *g e4fkmh-fjzu9 *7 a50tbtftm lgle 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 seri gooeszex3b ks+,o(z 6(x:a) yes circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance (,3 y)oz e xs:+zg(kx eoab6osof 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 capacitan-6qvl4o l s2 rci1rbc7x/-t pyces is needed in series with a 100-W resistor and 15-mH cocoyri1l/27c p-xv 6- 4ltr sqbil 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 inducti5mgrn 17 cz6- 6vt0qruw +wpror at 5000 Hz for a total impedancqrz+-w0v t16i pu6r7rnc 5w gme of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resiy b1qikj p;;x;um.fo9 w0l5zf stor at 1.0-MHz for a total impedance of 1w; .1mbpfkju0i;of5; 9xylqz50 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 l bg.8qjuk 4b4lyj dj7m-1w*ky,+tgdwith a 20-mF capacitor. What is the impedance kl41y+.yjld8jwg-tg4qkbu 7*d, jmb at 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 kHqw4*+ jg:y taa/z( msl;+ kazkz for a total impedance of 45 W?wak+z:;q4yk+ l am(t z/g*jsa

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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 i umv,vo8q:hbp8ut/ /(: 6lzcn* qotdyn series with a 10-mF capacitor at 1.0 kHz for a phase angle of um,*dqh tvu68 by/ :l o(op8qcn/zv t:$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is (9qd7nt,c vi r( ((xw lemht63ntvm+nneeded in series with a 30-W resistor at 1.0 kHz for a total impedance of vtdm( mt(hwn ( 3v+cn9 tlr6iq,n7 e(x45 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 H xl8n y+a;qynsrz *ebvu). a,,z. What is the phase ,q b,)x 8;uy+.vynaralesn* zangle?

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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 /t 0p9wpjnum:resistor, 20-mH coil, and 1.0-mF capacitor are ctpup :0jmn/9w onnected 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, j0w45fl)j gf8ta8iz7je ck s( a 10.0-mF capacitor, and a 0.3s5)a(j8c7 i4 8jlwg fzj0 ekft50-H 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 rphb.3xb xs 6t18+isiy n b3a1/vibp d)omdi*( eactance 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 i3 1.sby/)m(iihd8x io pdb6 3sb bvt*i1x npa+n 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 aqzi:l7fqjqfi.94:d 8 jq y q;y6 1axeRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?aj:;:9x q4 qy8a6.iqizql ey1q 7ffdj

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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 pha2fys,q6v4elqu/ 0/7)pgoffmm) cy akse angle of o7)mu q/2cq)fge,sv p yl0yf/6mfk 4a$40^{\circ}$ 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 hl*u-5tu ifxit oeb7( 9as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourifl9-7*et uiu x(5tobce?

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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 a,h(axo(c t11k .3s +wbe fhdgjc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ,ah w3x((1jdkthesgfo c +.1bcapacitive 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 circu + ,5oovwqmb2b0pi f+qit 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 imped*l/ e )/wrxoyzvf/df0 ance of 60 W and a resistance of 30 W. What is the power facto vrd0wzfeo* f ///l)xyr?

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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 r8 u:*qxei ;ghq y.s dlx-42raxesistor, a 10-mF capacitor, and a 0.45-H inductqgy 42xhxqx:esli u*;d8 -ar.or, 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 capacitor and a 15-mH c0wq) 9 j+r1fq2 uqsvbnoil in series?+qj w9bvn2sqr0u)q 1f

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resondg4xwhv q 0 x((vkwzq;44odd ,ant frequencywx4g(q o0h4 v(d4;,z dwdqkxv 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 reso*cya6f4 ccgino xer*))55znpk/ 1o:zl-g al dnant frequencg nk1) ccnza5*go olpy6*)d:l5zi/a fr x4ec-y 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 a n)g4pc8g.e d0, v qa 1n4hdenj40-mH coil if the resonant frequency of the circuit .d1h 4pe)a4dgv0cnn , gnj8qeis to be 1000 Hz?

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