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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flioy*wmbc: 4( )6a(l(tgvq pcjux 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 thbk4rb j 0f sn/ mvh6qxhz:i6f.o.x/b2 at 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 kind cw.fihpf: :w )r7:)piyx)kf eof change on the induced :w f:frhpi ) )).k7xciwy: pef$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop ba8c3,vd-2b; 7pwpc sv y0gedof wire produces what kind of change on theb7ga pvswcv8b0dpc,y ;2 d e3- 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 ot24 t5/wj nxbproduces what kind of change on the induce 4jox5t wb2nt/d $emf$, 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 magneticw 2-pb9 ck xdt5s kcmjkt(b/-. 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 i9c4cnx j0jjcgtg 1lrc x+:ce cq/+n:4(a(bixn a conductor will be that which tends tong4jct(jxeqr l01ca:xg9j(+x b 4 :cc/ c+ cni 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 barbz58 qtv vho*gdj)p4; magnet is held above its center with its north pole pointing down. Tvtqvz;5 *)jpgo 8b4dh he stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held aboqbudubib8 +z9egw y-wcz o-)7w98hq8ve itsyc gwozbw 7u+hdz 8i8-e9b q9qu)8w- b center 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 table top in a region where the magnetic field 7eght,z i jbb9 b09jbtqtfn3sr: 23- lvector points strag0 n93i3bs2 l ,tz9e fqhr-7jtbb:jbtight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a le7svkvf ,fnpl 3-2-.xg ) 0g x2f jq.heepsghz(vel table top in a region where the magnetic field vector hl0qpxvjkghf nx -f2 .e-7)(,sgv. zp3sfeg 2points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a qrs. ft il5fs1. 2g2b/vmp3qfahi.8 cregion where the magnetic field 5 r f.ivitg2f.a 8s/ps2fcb.m1 l3hqqpoints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field 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-increasixd 6fk90j-hf onv58 bcng current northward. Two coils of wire lie flat on the table, one on either side of the wire. W0bf6xdjh8fkc o95v -nhen 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 enterh .3ggnk7*lhning first. As the north pole e*n.7hlk ghg3nnters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spedy6n17mua yb9 ed about an axis whose direction can be varied. In a region where a un ny1 dy76bm9auiform 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 co2l u7vvda7jn(l it ci q0d(m zprhj43- o5,c8onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the indud3o 0qt7lo7 pcznj m(5a8-lcdvri i4,juv2( hced $emf$ 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.u.4n16qzohows f6fjto p;6 t8
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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 t5z l.t4d 6wtbns v j+-dqw*4lqhat 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 magneti si-1 p5e6efehc 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-w : pf,wn5moqi*est direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemen m io:*wfp,nq5t concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angulq wvn*+ x/y95dhh2 pmz l0*uxb:xxwn7ar velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trk dl-d8fxb(.ufi5hq).2gve oc8h y n1ansforms

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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 revolution5n at4 1suu2tas each second. The frequency of ttaa41 5nuu ts2he $emf$ 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 devicwbq /b68qb 4s2wfnc r.e 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 dmmzz/(7,3qve ezf 4osb* 56wpjtre;mevice 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 loops than the primary 6+iil(ravd388z g cbgcoil then it 3cz ( 8+86gii vglrdbais 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 coilx r0ln*,74cy3c x lnuf contains more loops than the secondary coil the ncxlf37, xrnu0y*lc4n 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 i e;b0ka-o mmuzufo +5.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)oq6 y6/ur 2+qt3x kjd/mrv fdrg:m4e circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batteryh sej9)0:,ao 7b suakq7szw-k of constant terminal voltage. At the momentwseua o7k0k79b j:- aqz)ss, h 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 y y,s45acrfb ;z+uee;in series to an ideal battery of constant terminal voltage. At the moment contact is made ,y4e u;be;y 5+zascfrwith 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 and resistance R is connected to an 2jf/v(n 3w9 h:, y8whewbxhck $emf$. 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 + 1ad4ax(7yrme*z5j qp r8 uheR 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. Thev61s08lg pks u time constant for the circuit represents the time required for the current to0lsskv68gup 1 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 connect ,p .lvfqhxm4k56-enred in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease t6pln 5, -xvmekqhr.4fo

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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 un),7z .v +fu+rh- oswjdjv0hb gtm9/ xjits 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 tt 4/zzzlcshh/ a(zs+6o an AC power supply. 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 powe-wcfrqkd 3/yh+6 lq4 dc:sa .er supply. In this circuit, the current.fd:wl 6c/3r qcq+ae hy d-4sk

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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 fact,td,pt3 e fbzi-go++b or when the frequency is tripleeo ftdib ,bztg,p-3+ +d?

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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 vow4bt:j; 1e o.p *2mjd kz*gkbh3pqib.ltage across an inductor is doubled, the inductive reactance ofm z.4q* 3dbkhjppi2b e .:g*w;okj1tb 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 indu (b.gpgj0m q4gfsw)tni5yq )epv,3l,ctor approaches zero, the inductive reactance of th 0vm)jftn.s 5)yl pg,iqqp4e ( g,g3bwat 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 supplqe8qil7 u6oh5 7kom,my. In this circuit, the currei8qkm657ohe,7 l m ouqnt

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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 a-5 8c5s(ey qwk:si*n2vokamsn ac circuit changes by what factor when the frequency is tripl(5kaq w m5i:nyss*cesv-82 oked?

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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 voltau (z 5uj92hody tjh: wc/3ejjzcr;+0o ge across a capacitor approaches zero, the capacitivojt/dcjujuy (e9z5;2h+0 : zc 3rwhoje reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between thg vy.nhw7xzm)pb)8: je voltages of the inductor and capacitor in a RLC series cvp:h j.)y mn 8wbgzx)7ircuit?

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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 RLCeygmhr5. lf 4/ 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 civa 2fe;rg3w9ercuit increases if R increases. When is this stae23 v9awre f;gtement 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 increases ify a)bl8 3lje4z44elcc $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incr4+zsd ;idr90 ov(ji* p ac,troeases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circui *dn e84ufee 0k+a, klkn2o.ukt, the resonant frequency of that c84 nuu0nko *aekf+k2 led, k.eircuit 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 ;wj4) sm h-tt-jn+obzan 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 ci6k2wq znu80ir x3 xjv9rcuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.74s, a 9to9vjwz l8xst20 xav,9tswt7j lo 8 z9s4T. Find the magnetic flux 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 rotating intv5k(u)wp- + 5fd cwyz a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th +-zutk vy(5d5fp wcw)e 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 unif,bd: q.m2b 40qfz05w pvhzv qform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an wfv b0hbvf p0q5zq, zd4m.q2 :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 l-+4 3zfdfki jcoop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from y20ivwu)hz. cw, m f h8eb9;zk$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wu56,lgq me .adi+m 3,goak;vjith sides 18 cm. A unifo lde+ ivgm 6,uok.,a5aq;g m3jrm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an a kn6u g8,h(gmfco56pl rea 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 amss, q)5bwj+irea $0.20 \; m^{2}$ 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 :wxsxl 2 v(81wqo qjn8horizontally at a location where the 2qx slo(j 88q 1nwxvw:downward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity3f5gagj) hcyv8c oc*) of 2.0 rad/s about a vertical axis through one of its ends while in c f5ajcgc)*g)3oyv 8h 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 2i+sq icw mt v:jb6q+)6mcar0,-wmu/ rf, bfnof $0.25 \; m^{2}$. 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 wiycmm,raiz l3/. i t/ 81o-wwxxre 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 armat ku ridxg5hg-6ofn5(9 ure. 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 fu65n5o hgrk9( -ixd gmagnetic 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 turns of wir 8m h4z,yrqj+t k8*6nbwau ,ro0tx5 mve 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 with awmo ;wenll a fi (g6)8 r,s04a-vkcw*bn output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating l-larfvo )nb,ww*a(w 0;84km 6gi cse 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 1hvk0 1(jk rxv y /f647xcxyyfwith 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 resistance of 6.00 W. The motor operates on (mv q;q0c/dzk $120 \; V$ 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 aa*.c;1edwc,y e/soa xd f*z0b resistance of 6.00 W. The motor operates on 120 V AC, anda *c*ased1.d/zb0,;wefyo xc when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 +0qpt)re)rt :vycc0q l,hu)z W is connected to a 24-V power supply. The optc yrpq0rcqzh )l :+ )e)vt,u0erating current 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 power supply.ygu1bql: pc9o. )p0sh The operating current is 1.0 A at full speed. ppco hq0 .slg bu9:y)1 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 pow8wrw5nz a8 a5yer supply. Thezaa 5n85y8wr w operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer i,oroty+n9obg 3k33 nts needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary ofzy g7kcd 3 c+t2x pbiv*ooe w421c7g2l a transformer causes 14 A to flow in the secondary. 2xcz1 t4ok g 2g*l77+3wvpob dcec2i y 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 necessary in a 110-V primaru2kyh -j( zw/ muvpm50y if the 24-V secondary-2jy/uzp vmm k 5u0hw( 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 prim zom8xuj(ky5;b+ q0laary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in tkxzajl5;m +quo(80 by he 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 8)3x(hen(gphbbkb/5*ddhce w .+fk g; 2 zoepof a transformer. Assuming 100% efficiency, how many amps at 24 V canpwd(hf/*ee)dchnk (gbob+ h2;. e zxpk35g8b 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 (o07u ze35 opgpfe*cw at 10.0 mA. The primary coil operates on 120 V. What does the primary drapgeowo( 3u7e5cf * z0pw?

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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 primaryy7w;0qhv rqw+* +vt kcm3w b-lf r;cyflf*u 18 coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in tvf wqclwy-7fu0b;fkw t+1 l r yrc;q*+m3*8v hhe 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.vj v5s6s b(q2:wu) p ylu1d4azz*xep coil and 300 turns on its secondary coil. If 120 V at 2.0 12us5vy 4xweasz6 b) zjp*dpq.l(u:vA 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 transf7* t gc4tcag,z4u61sq apd-y rormer has 100 turns and its secondary has 200 turns. If the input current gsqt76udg pzta*r -4 c1 ,4acyat the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Imp- -.oq; gghyf the input voltage to the primary is 100 V, we cmpo-h g-qg;y .an 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 transformer has 100 tur3s o)n 3uwt th3rcco tuw-+t;5ns and its secondary has 200 turns. If the power intw+r;ts cucnut5 wot)3h33 -oput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thqu2r 6hflve:ots;)k) e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prim6rhkst )v oef2)l:u q;ary 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. Tnncuf 83lny8h. c8c. bfay:3whe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancc88abc33y y: u8l.wnf.h fcnn e 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 cut,z8-2yzj c at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power linzc c,2yu8-z tje of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lo-o; fvcxk(a2;l vde:eng has 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 stepped up with a transformer with a turns ratio of 100: f(d;2 l veo:a-vcxek;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 )fvv0ev5vvb 5W. A generator produces 100 V at 70 A. bvve )5v5vv 0fIn 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 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 1000cw*hg+7 olh 9dh4f2v k V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1004+wvkc7 hh2 dofghl9 *0 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 tz;w 2,l*og fnvransmitted on a line with resistance of 0.60 W. To what voltage mu,;zv*wgl2onf st the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored *qcpjwg6 x )wi q6v5s;in the coil's magn x;5c qvs)6ww*p6i jqgetic 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 resis5zeok z333unnj/d6bmx0vy2e 5cyyv 3tor and an 18-H inductor. What is this circuiten5kcxyy63nozymv ev3 u5b33/z2jd0 '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 circuioo he, x0zs sm4j3z ors;ey9)6t 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 outlet5x0 u3br6;n)xly rqh b. 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. What is the rfog8a :1c7)u 0(wqwuai dfs .resistance of the law:ug7f0 f8odq(a1w ras) iuc.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 connected to a 1i-s m-oave5zat 0pm+t1t 86 ex :ta8pc20-V ac power supply. What is the peak current through0t1a ex-am5 i 8:svzt-6mt8pcte aop+ 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. j fopiq(e(3g+ What is the power dissipatef3o(+gij peq(d 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 9m)/f y,j2dg nw /wg 3o8mbnd1 yqxq1v+ bs9puresistor 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 resg st8l,z+g 2y70wxfk 9)vfrr.iriw-uistor 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)nt cb6lkdc sg ;29yi40l rzq3 50-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 of a 1 rnvup;q1( 9o .lk3xvvugm)g6.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coimiz4xt,b y7f f1uj/ t3l 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 wf7a )xo15gpdhave 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 necesn76s ;b sr;wlssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor w g +wsqha(m7 6bjqego()dy5o2hen 120 V AC at a frequency of 20 kHz isqqe (mgh+oj) y ( bs7a526ogwd applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,i yo vx, d;-9hhue-w7(a :jnuq 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 capacitor at 10 i(ylm8zmyl ).-ion roh64u +lkHz?

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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 t7og g:ay:wi+ -rb0mb-ptvy6 mq9(ye jo 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 reacta9 -cwrtfj ms / +r1vn5*(wjjmqnce 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 c 6sx ao1+tkw1tapacitor be 100 W+was 6k11txot?

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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 t bqfwx1*baaxcf0 9j v9gi)/ :dd:cx 8dhrough 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 circs(py+wgz5 f76it8yx -x ks.uquit with 12.0 W resistance, 15.0 W induci8 q yy s z(x6pg+xw7s-k.5ftutive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, nkn 8uqxwv/9l2jb0-u3r +it aand 1.0-mF capacitor are connected in s-28w /nvr 0ujinq9k tux al+3beries?

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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 refd ecnk:56m3; wmd;whsistor, 20-mH coil, and 1.0-mF capacitor are co;cw5kfd3:m dw6 ;hem nnnected 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 cfc7o btxavq73u,lt ,,y7 +f3sv ergj (onnected in series with a 20-mH inductor, what is the impedancs g,x7yt3av7 b3q ,( fv7oejftlc,+ur e 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 s.k a-9j w)et2 egkh+aeeries with a 20-mH inductor, what is the phase angle at htk - )geaaje .+w2ek91000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF c(z p9ez*e7k xue3sqn. di g71dapacitor for a total impedance of 100 W at gepkn(zdi edq x*.3z977 1esu 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 capacita *c;t-ew4 dmgg(p;eldnces is needed in series with a 100-W resistor and 15-mH coil to get a total *c wdgp eme; tl(d-g4;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 wi4rjxuzdpk7 ,0th a 450-mH inductor at 5000 Hz for a tot4ux0j,7z pdrk al impedance 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 resistor at 1.) zv;j:8 zg8tu.j zhig0-MHz for a total impedance of 150 ji)z:;8gu.z8 gtjhz vkW?

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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 ca, xmy,/zfk cu8pacitor. What is the impedance a z/cu 8,x,myfkt 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 atu1fb4q4l09 jl9lgdx) k w na:j 1.0 kHz for a total impeda49jl10b )nwlla:kf 4gd q 9jxunce 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 capac zox2 /gbx-jt0itor at 1.0 kHz for a phase angle o xt/0zoxg2 -jbf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee:9vtky4 p wjq). vbse.ded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W.jkv) 9wseqv:bty 4 .p?

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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 capa zndv08v6 hdaq9h:9fpcitor at 120 Hz. What is the phas az qdp9hfh6 vv98:n0de 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-Wo 6yg34 dhfk7n resistor, 20-mH coil, and 1.0-mF capacitor7 kg4fno 63dyh 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 consist )(2(koays, bfluvs3rpg x+f0s of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powrau+)(ky sog(3f2x0l pv fs,b er 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,3 p86zxfus 6.nak(qux a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowsxzuns x8q3.pka 66(u f 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 aqv -.sye7d7:cvs-aj ) f pbrp- 50-W resistor, a 10-mF capacitor, anprsv 7 abcds -:v7 jf-e.-y)pqd 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;1 ,(ua xftostmj4hfhv 4x.4rx .;e yp series with a 500-W resistor for a phase angle oeh(at,y;fxxsv4 ;o1hfm4 u4rx tp .j.f $40^{\circ}$ 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 =5 ;gudebh(r.j 10.0 mF. At what frequency should thug.5bhed r(; je 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 at wh3f6ga, )tt7a0t wac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuiw 3htw0tta)g , 7a6tfat 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 isq f*zn7y *enhep(c)kz8a z5d3 $63^{\circ}$. 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 of 30 W. What r v38du:vob +2 gjlw( **xeirbis the pog(j o 8re:3 *2lbuvrx*b+iw vdwer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circu38ysg 1v r vj-gnx+ag(it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s1n(gga -rj v v38+gsxyupply?

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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 ):m 6yb(kz9j xx 1ixwqmwop7+of a 1.0-mF capacitor and a 15-mH coil in series?1mqm):pz y 6 (wbwoxixxj9 7+k

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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 c7k0 ixo1 yxmu/ ckqg32dtzx -)apacitor for a resonant frequenc2qkmg7/yoizk3 dxx )0-ctx1 uy 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 needzy i0/mgau5k3as . /hred in series with a 3.7-mH inductor for a resonant frequency of 1000 i3/ msuyha.zgkr/ a50 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 40-2- btehcy4y/ gmH coil if the resonant frequency of the circuit is to be 10t /cybhg4ye2 -00 Hz?

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