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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 following4* dwl+c9y bwp are 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 6- t,mjf qbgkxna24h+0(khefstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chan +(v(ivu. hmkx:e3e irge on teihu:.ve+xr((ikv3m he induced $emf$, 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 thro/ .mfm vpslx tcf.g 7*r:u(3eeugh a loop of wire produces whatsl.e x cm(fegmu:*p/ t3fvr7. kind 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 p;1kh h3m,xv+ 1fz* s eiq(fkdof change on the induceddkev*khqx; 3msp,1 hzf(1f i + $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field a t( .i1*icxtxjq 5.rks8i) ngan $emf$ 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 o0o- mdbq (l9hr d mi8w9vxx40pf an induced current in a conductor will be that which tends to produce which of dl0 w(mbro -p0xhd9m8qvix 94the 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 mag4bhy 59febm gita+ :a1net is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abov95fia1t4ey:g+bb amh e)

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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 h kit139rhswbd; kqh8w x1zj0/eld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet ;d9 /0z3qtkwhs h 1kbx81wij rinduces (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 t84epo3 pqngikj8e 2//*fjifnhe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inde/8pof 2nn3*ii fgp 8e/jjkq4 uced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region xj o5ct :1(sluwhere the magnetic field vector points strtjx :o(luc 15saight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field ,wo xs k;uhk x.,;rlz4points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fie,,kx;o4;kxrsw u zh. lld 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 horizontala-hk +2tl xzy5 ux(nz5 table and carries an ever-increasing current northward. Two coils of wire lie5u5-a(nztx+ xhk lzy2 flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pok5- .wl*x/ohw x:c ifxq 5p6;ggsp qq8le entering first. As the north pole enters the wire, the indu 5 qkl-*.qsw ox6fqphx 8cx g;5gp:wi/ced 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 speed about an axi.orm(p)l3 fiwe * l3rts whose direction owr*m .(lt epfr3i) 3lcan 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 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 rotatedw a raozw1 yl-uh4q ,owk+0.0u at constant angular speed about an axis whose directw 4akywrz+uao,- .loq01huw0 ion 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 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.-zdu -mvo u)1q1w +yvj
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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 a3y) aup vub)+tn $emf$ 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 dd 9xv;wiv/dt zz6/:+flb nd7$emf$ 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 h)7lq; tn6 h*uokz)ia2xfbu p. ,i i/weast-west direction) is moved northward at constant velocity through a magneti ;.)zbtikhifhl 6uq/,*2) pan7owix uc field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocit2j(i9m6 1qyob 5au;cx2 nad b+(jhj mhy $\omega$ 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 transformsc70+g()un 0om nacicq

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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 z+ zlc0;l y/ib60 revolutions each second. The frequency of thellzbic0+;/ yz $emf$ 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 used to -c)nztr dfezbi0 5v6e4y:;(gfrt5 bs

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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 sq- zq/7wjkr6that

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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 thad 3+jv/ wh lfq-iptdb -iu,32gn the primary coil then it ut/3dh -qjpf d3vg li+, iw2b-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 twtt tmgfz,8,0k *rxe3 +(nhnahe primary coil contains more loops than the secondary coil then it z h(m, n+ fteg3,0kxtrnta8w*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-tc x4ok,o* az tb,1i0i0qqoe input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant qtpc36n5ko3tcircuit,

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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 c e**o6j 4oyxqqonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the y x **6jqq4eoobattery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons1eerta 6u 7vx4tant teret 4v ae716xurminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with in a *u.ry3gol:i+lns0h9io 9)zfdcb m 5ductance 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 indayze53s - /jbkdh 6yf5uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in9ozvcnh4 8km6rjqargg*)9w t3bk;) y series to a battery. The time constant for the g;q6y z goa 9 )j8 mhn)kw9v3brrkc*t4circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecteddxr 2a.5 vdyec2hw3l5 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 decreal25vhe3wx d5ya2.c rdse 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 j+zira -+z 1owunits 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 supply. On thiz dcn gj/1:)bpgwp cq2:m1 m7js 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 connectedz*j7lbn(rq y u)j0 9d ,(kf9wlhu5x ns to an AC power supply. In this circuit, the current9l kunj7l9 wf(d(b,nq0jr)5 uy*hs xz

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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 bu vs7k f--d0kwwua1+9snx /qfactor when the frequency is tri dfkb7sawkxw91q-uvu+s/ n-0 pled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor ,pzf /nkylae436eo; t/ p -pfuis doubled, the inductive reactancen lpz/-ak,/e36e4 puf ;yt pof 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 inductor approaches zero, the indzajah49kq3h;fqei5 dr b+.: q uctive reactance of thqaer ; kh3f+dqi9.bj4ha:5 zq at 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 supply. In this circuit, thir p( t9o-3xt(acpo-he currentx-p 3p r 9ototahc((-i

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when theslu mz xt5+6pc .pvx73 frequen z 6pl5 x+.p37vmstuxccy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage l ,.df fxtbvjj*pv5d18gz 3;pacross a capacitor approaches zero, the capacitive reactance p.,dx3 dtgf 8bjv*p5 vfl1j;zof 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 betwkgcz*oe gj- s27zdt85een the voltages of the inductor and capacitor in a RLC 8oesc-dk*z5 gjz7 t2g series 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 RLC circuit isncouozz 4j9: v 6l6.ena.nb 6w 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 circui4 k:syzv3hqv-t increases if R increases. When is this statement zy-h s:vkv4q3true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circcv ce9m;ss:+ zuit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit is01bt jd 81ml j9or 2gzgl.n-g5sh1lq ncreases 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 LRCkot3.r/ te qo* series circuit, the resonant frequency of thart.tk /o3 q*oet 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 drive ;j9-n*oeqs /3l soxnu-g oosa55 h3t,i)pczjn 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 circuit occurlymvc7 83.t.v zwv8m xde 4lp3s 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 0tpej1u. hgg/9.20 T. Find the magnetic flux through the loop wh19hpuj .tge/gen 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 uni.jpp5 xthhp;3v;x9f i form magnetic field of 0.20 T. Find x t;i 3v.pxjhhpf;9 p5the magnetic flux through the loop when 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 rotating in a unifo9e4b w8ltpt7,s6rgy1 xz ) +qyip)cuqrm magnetic field of 0.20 T. Find the magnetic flux th4+szgwpl 7rxc)yytq9 b eiqp 86u)1t,rough 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 lik8d+ka 82d,on4-0otfutt o; e6 flsof an adjustable single 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 changyv0p, vjr-1pges 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 square frame(hdt qjn9n0jtw1, :1 wynrwe ; with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the j ( dw;wjr :1e9nqht,0ntyn1w coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area xl)*9:ml-swsm2q d12z awb gbof $0.40 \; m^{2}$ 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 a(j t/iw +ok(h20d/+orn m pnhynd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fsa 3,wtnt8b +ulies horizontally at a location where the downward component of the8 ,bu a+nttsw3 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 w oeje6 zxkm3o9*v*e :a constant angular velocity ofzoj*:m36e e*ve9 xwo k 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arevjayta n bdgp43, c6)2a 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 cons/ftf (+k 9:fxd 2mv91nm.e*qjtputgq ists of 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 $emf$.

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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 m;by1f ,g epavxno 2,qhdg ,tn 7m762jloop is 12 cm long and 8 cm wide. ,t ;jdgf2n epvhy1x g,27 m7 qnam6,ob The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns oo x (i9 ws/be39cptod:y,ym7jf 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 with an outputnw9 :f )(ceohgu.;rl/ njzlh . mg( e6xz/;zzt of 12 V maximum when rotated at 60 Hz. A magn:fjlzhz ;x t/u lcg me;(/g6rnzh9 (en..zow)etic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a geny hpcpmem7uy92x jmx 3: 25z.perator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistancn 0gbd:ekio-; e of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor o+ k .iwf06tyrs8 cwq8gt.ghm-perates on 120 V AC, and when running at full speed it generates a back msq8y0+r i8g.k-twhf twg. c6 $emf$ 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 connectedczpav, 9 ;5.axplv uh. to a 24-V power supply. The operating current is 1.0 A. Wha.a u5lpc;zv. v ,h9apxt 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 (fsfhcg)r/7q power supply. The operating current is 17/)(qf gcrhfs.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 s0jn3-6 qjkffW is connected to a 24-V power supply. The operating cun 6js0jqk- ff3rrent 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 is needed to reduih9)5er,- cs+q u gqx.deu.xmf8q z m:-x 8idhce 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 tran8-a.zteunj: qsformer causes 14 A to flow in the secondary. How many turns are in the seco:ujtzne aq- .8ndary?

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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)o8 uf.lk ;z*tul+hvaw8 :wpe are necessary in a 110-V primary if the 24-V secondary has 100 turns? k:plwh)8tf uvl+za.;u*w oe8

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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 a7 qdbf5w p0i8qda/jit+ z0 (nq 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primaryqz5id(w0dn07it/ bq8 j +afp q?

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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 tr+9 bbvn 0xuk9vansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secon9 xk+vb9vbu 0ndary?

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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 n*1u 1a u.ev40 fjiasfpeon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. . is4fuepav 01 1fuja* What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnslv v. ai3)2lqx on its secondary coil. If 120 V at 2.03qlvx.a vi2l) A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer zeq0fxjylrx pq; +1c,im(:;ehas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sep,1m+ 0z;x:;(j r qciqeelfxycondary?

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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 4hx/d l 2tmgk ..kaw3q100 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 secondary t/mxw h42k.q3 aldgt .ko 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 20ayib 8cw/9*8k( a4t6sa bhtd q0 turns. If the input voltage to the pri(bitqha/b8t 684dwy s 9k*acamary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 gp+qruwt 8(h)x y w(*qggju21a b+m3x0 turns. If theqw)ga2 g+gy*w8 3u+mqjb1xht rpx(( u power input 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. The volt3rb tpjgp /2y4age 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 sec2ygr/ tp43 bjpondary 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 i+b7cggkq ik g3fd k45,s 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 los3kq7if kd+4 gcgg,b 5kt in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vole5oiwt72e mjp +ma.(8p ,iucy tage 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 voce2 em 8t.iup(ma y7,wp5j+ioltage 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 fbxw 1oa/j,w4p 7/7jc 8 ffkweline 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy 84wef ab7cw fwpk/f7,ojxj /1 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 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 9vjpddz+q j-;line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to red-p q;j vzjd+9duce 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 1000 V. How much 0 p3shaz q/yms,t3j q6)tbuq. less power would be lost if the powe s3y.hs )uzqamj/ 60q,ttqb3pr were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generacb,0e rwhjj;22las 4stor is 440 V at 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 power loss in transmission is not to exceed 0.010% o 0bsca2rh2;s we,4j jlf 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 ofudrd0w zg-8x 7 5.0 A. How much energy is stored in the coil's magnetic fi0d-gzd78 uwxr eld?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thi)prf; 4+w4qk a6 )yaa hhop:zis c h)wzk+)q :6 pray;ip4ah4oaf ircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120djr 7bhjv;xd *ey*. ;u 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. Whatmiv pw)x00gru) w. m2v 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 outletw-dog :sbg7sps6v- 3 n84n0tte he x2g. What is the resistance of the lamsn ovte0 827 6:-ng-dhpg b4wxetss3g p?

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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 pj9 qxfsuo4ls-n. ; ;r w5spsw-eak current throu p4lj9qu ;n w; -wxr-.sos5ssfgh 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 a g);we8w)z v3.4myzixkmw r2 ebr6wn+ c power supply. What is the power dissipated in the resistor+yk w;wm r)e w8gn4ewbxz)v.imz32r6?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through 0p9--uhlepv 1e i) bita 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5 k.t/0lh7;c-m -y zakdlaa .gw0-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 resisuq-bw 5qz1v 0x:nr-c ltor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH i ;a 3m;d-o,iwqp aws;fnductor 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 repg heo(uyk7.py)r0)iactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14z3zi qn g-4l3o gg8q0b.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 in u /81gqll4hpfductive 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 AC at a frequencwngq wsc6q z7 5*- a6u5jqftnxau8 8s-y of 20 kHz is appliedqaq6fau 8us ct j*s 5gnnqxw-6 57z-8w 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 ur*jl/f m(ltxh2g (a* a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of 3px mk02t+ md9grsr *7pktq)ha 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 have 50 W of capacitive reactance at 10 kHzcyh:s-. ,vjsz1; naih?

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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 capacitoj.w-t4 (p5e1y x1uhdw ,yzxa7a ,:o ueb/sksqr 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-mF0yr2lqh (w e5fqfjz j: ou3j38 capacitor be 100 W?q heflqo0yf 25wj8rjzu :3(3j

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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 1cuuskr;8q53f +11z oplm;s kr000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1vo)7n0sn rbrrcw,0 0a 0-q4goevq5k y5.0 W inductive reactance, and 10.0 W capacitive reactank,ve0 v7g4 by5o0s0)-n0qrqw nro carce?

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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 H-9b2k072ts1l qpoz c e rl/ilmz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connb 29e2 7k rc s0-qoipml1lz/tlected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1ke( r ldtm.*z1.0-mF capacitrt. e*l(kzd 1mor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thefnkwu qg; /ib/dxk.: 6t)iht+ impedanw ixgdb qt6//: tnhfk+.ku) ;ice 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 induu/4u8kfyb jx gl:e(t./i* w f ko2dd5hctor, what is the phase angle at 1000 f5xjlyd82u:b k*ogwu.t(/e/dhik 4 f 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 1.0eewdodom )/,nqki adtxj8:h 5-s,9a --mF capacitor for a total impedance of 10d,5,otj-h-: aewems qn/ ddx 89io)ka0 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 needed in series with a 100-Wv qz6 7g3exoj6 resistor and 15-mH coil to get a v6 73qgj o6xeztotal 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 witha s ytg9d3s6a,p2ik g: a 450-mH inductor at 5000 Hz for a total impedance of 40si96a g, akspt yd2g:3000 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 resis (:j6r-co- ri+bh e pr1gy8xoptor at 1.0-MHz for a total impedance of 150 k6 :xrg-p-8y( oh o ejc+p1rribW?

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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 capac/b)ug 3yw8hdb4db */f(nzxg gitor. What is the impedance 4(bx) gb8dy3h/u dwg*gzb/ nf 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 se u5l9cshi cblu-i h223ries with a 10-mF capacitor at 1.0 kHz for a total 2li5b32lc u i9u hs-chimpedance 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 1; 45/fidbsk dcp1/onj(ohgz, 0-mF capacitor at 1.0 kHz for a phase ah/do( c;p5ki4bosz1/fgn ,d jngle 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 needeso0ei(7nj fwl t1.uzx:*rtt5d in series with a 30-W resistor at 1.0 kHz for a total ixi tj5 0:1wszto.f*lr 7enut(mpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz.3m8 yu 4om xj7tda-g(ym)zd*uy rvs*r4/d 2mc What is the phase angluy4/* xmvg s 4ajmdoc*y2 (mr-y zm3)t8du dr7e?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, andoiu0ktw7f j(s d5p,h fx0yqs5)e hn*/ fx( 4za 1.0-mFt5*sf7ou0)x /45(z f dkfqe(n,p yxjhwais0h capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0p vpdl+ny z 1:8i5i9rfcuhl9*w7- n wu-mF capacitor, and a 0.350-H inducto ipin z+78: -5fphl9u*ryul cwwn 1d9vr. 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 c5 -9t6u3 mh*v wzshmxkzf33klvt4dx:apacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in s zxm*4:zd 5hltuvv3k w93s fhm 63-txkeries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circw.mt wij*ubu/ 7b2;r vuit containing a 50-W resistor, a 10-mF capaciwr;mwu /* ti.uvbj27btor, 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 nsfo-1me )1zd tecessary in series with a 500-W resistor for a phase angle ofo1t-)1sdz m ef $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequene0p9(vuzhbl8x1d c4o cy should the circuit be driven in order to have maximum power transferred from the d b e0pdc91( 4xh8voluzriving 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 resistance, ) d 7sz. +,rcv+rc fie9d1qesz15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-Vc cr.sdef v+zqi7,r9eds) 1+z 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 ACy4jv3s2o. d ps-x c,5+rzgmp v circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a re 6l5*krdxa2 wo/dw9lh sistance of 30 W. What is thw 65ha*9 lkoxdr/ ld2we 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 factor fouo-d qwx)e2hw/)f it : w+n1ojr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0wq):xe2n)+d - w/hfoju 1oiwt.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 f*zcr w+ed w0r/q/x01a n r+ngbrequency of a 1.0-mF capacitor and a 15-mH coil in series?/e/rwba0*+rzcg xrn0n+q 1wd

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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 chz j:kr46c.-xauc;x1g c2k a a 4.7-mF capacitor for a resonant frequency of 10 k:.j hkac;rc xcuz -a624x g1ckHz?

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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-ngs ,phnyb/3/gyqg y f 14rs-2mH inductor for a resonant frequenc1s ,nn s 2fyy/3q/rh-gb4pggyy 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 621+rrxko rcytju +.m be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequek.utmx+cor16yrj + 2rncy of the circuit is to be 1000 Hz?

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