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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 unitscxa bot-wh101 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 stateslcbl j z2q/z;20mk 6y,jfns+m 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 )., dyfvq:wufloops of wire in a coil produces what kind of change on the induceqw)v,f:yf. u dd $emf$, 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 th6b;e frd+e (rne 0;nxxe magnetic field through a loop of wire produces what kind;edrf 6ex0;ex nb+(nr 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 looqnzv x(m2w40p p of wire produces what kind of change on the induced 4vp (zxqw m0n2$emf$, 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 fpcpl 0fzjy4qh 2s:ty2 ( tqr7m 7)woi0rom a magnetic 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 cuglq1e s6mtmi gf 9;urd:d92+rs p63dsrrent in a conductor will be that which testeugg6s d:s1+ 6i q9 2pdmrr3fl;m9 dnds 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 magn 28e()gdya, hksa b1j-b rok3ket is held above its center with its north pole pointing down. The stationary ma(kso2br ,k1jkbageh-8 3)aydgnet 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 magnp10dpd 1g2lx 0w1 vjy(btvfs*et is held above its center with its north pole pointing down, and released. As it approacv(j tf sld0v111xgdpp 2b*yw0hes 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 regity/+ffq*x1 7x w. eucyon where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the senue.xtyfwq 17xc*+/ yf se 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 region where the magnv4 ot8kzkwqwiy5)thn 6(scpu/72 nb:etic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as tw/2b:u()ht 8ynw k57ns4pcotz 6kqvihe 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+ 4;dxzp,*gc aeq twg4 region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, + dg ,4cpg e4za*txwq;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 bz)pk3w a04p) 5jzr v/4 gfhrga horizontal table and carries an ever-increasing current northward. Tr akhvw) 04/z g4pz3gjb5)frp wo coils of wire lie 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 pole enterin-z2c-v. o.twj jcu;e9joka8c+ jh .t kg first. As the north pole enters the wire, the induced current w;twev c9z.a- jj tc.8.+kuk-jjooc 2hill 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 conlvzf. (ixav q;,/xhp .stant angular speed about an axis whose diqxla ; f/(x.vhz. ,pvirection 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 zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ahqcu*d j t kall8x1):3df l/o+n axis whose direction can be varied. In a region where a unif ctldf /k8 olja +h)ul3:qdx*1orm 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.*z o ,5x)lxo620)wsq rlk rgjk
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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 gc57b4 xu(vh kan $emf$ 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. q :ddqv ,a;une:nnw21The $emf$ 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 nort8ql2zbn;5+oc q./qavno7p3,jxc y l ahward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential in.p5z oaxn;qc,olan8yb q/ lc 2j+3 v7qduced 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 roppz*qc t )l-k*dcu73u 4zyq*ktates at a constant 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 generator transfwq) z7lu oe; t (rv0ex8k*9dkd p+9fyiorms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rot*pp;iqcueu2 f9u 1v3671 7klmvobyqf ates through 60 revolutions each second. The frequency of t efi9q1*1q7b7 ov uk p3mf;6lcpvy2u uhe $emf$ 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 devicav6o osm7 fbw6i,u5ohw n h347e 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 devli 8ml-((aarn vyp3 6vice 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 svz2.as7k7 peh ( xgo;hecondary coil contains more loops than the primary coil then e;sh7 o7kp( agxv.h z2it 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 -vfyku2 q- -xnthe primary coil contains more loops than the secondary coil then it is u-kx--f nqvy2 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 ia,p;(8qzoibj1y/ rjiu8b 9rur k5(ge 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 circuit,cv c zdqk.r2(ocwt..5

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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 battery of cons0 zyy3n zv3tq5a gn,*stant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor iz5na g0yn3zvq ts* 3,ys

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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 connectxjoz)u4tsb bk*t4 , * fo78hkued in series to an ideal battery of constant terminal bt8 44* *z fkus,bho k7jxo)utvoltage. 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 inductance L and resistance R is : 8kj1to1hcj 98s0pvkgd0rp xconnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is corubo(hp gcf1 / xp60tv2)id.onnected 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 y8h u+ e4z0ntsfbs1 h8a battery. The time constant for the circui8fss+ 8 e1nbty0zhu 4ht 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 awx/ jw50 sdn8wre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents th8wwsndx/w5 0j e time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sametq9byncx;): u 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 supply. On j/;h k5cixkn t22bf5 0szn9 ylthis 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 x3yos.ph v6ca,av0xp .x xc1 fo7ky 62supply. In this circuit, the current6o yav6xak2ysxc.x1x7.f 0v oc3pph,

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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 wheah/;w1 yao 4+az8pxcwmvh 6q 4n the frequency is triple1hvw4x ap8+/wqah;cam 6yo z4d?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, tqz6gj0e wg awe24 z+n: 4yz3gyhe inductive reactance of that zz2wgqew0gzgen4 y+:4y a63j 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 appc vni;pgl0 .0broaches zero, the inductive reactanc0 0pgi .lnc;vbe of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circug(yxvamnj9fv1os s 8a,1 - oe/it, the curreo8so19e n,ya fmvvj1s( /xa- gnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance o3 3so,c5yel/2 fyxhc.7*od yxi jaq6in an ac circuit changes by what factor when the frequency is tryx j/o5yc,oxqsdyceai6 *lo73. 32hfipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approve9lf)7pb9 frz;*cfh aches zero, the capacitive reaz )f*fh ce v7pr;lf9b9ctance 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 thed- mpzl*vbc* 8o6k9;0 xicnhr inductor and capacitor in a *89mld io-0h rkb6;pc*xnzcv RLC 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 is definemik/ )3nh3nj2*hwcv cd 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 circuit increases if R increaswb2 o*j 27bsh+iimsvijc1 0w18zu y p7es. When is this statmss*7ji1 0bjwzh8iv y1iu+bwo272cpement 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 i(vo ln6b) 29 +st aoa1r7d/a;xgdm yqdncreases 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 impe 4kve-6dw/n vxdance 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 i 7ywyw/ij 2(pb;t kt5the capacitance both double in an LRC series circuit, the resonant frequency of ty7t/(j 2ibk w;wt y5pihat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vhk2 yehla +tv*q8pv 78oltage. 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 RLChmm6fkx 5sii)x2i03 dh-p f9t circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifoy lf uzi7d0y2ozqxe,5 4g+w:qrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop anz4oxy +ez:07w l d5gu,qqyif2d 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 uniform magnetic fiely jk6 lu;l+n*b2dyn7 +crc qx9d of 0.20 T. Find the magneti9 j7ny2 l klnr;+ycc6 x*bqd+uc 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 uniformp8 *5qw1f;l-zfoeb7e e1th tb 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 an18htq tfw-bze b51 ;*op ef7le 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 qf9 k5+tdlf:olh0 2ifoop 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 frop ) g5-o:sirzwm $4.0 \times 10^{-5} \; Wb$ 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 wi gyw0h kjd. g+m68sk2y 5ps)b;4pfqghre on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.4d5;8h +p)gwgbf p 0jykh 2y.skqs6mg0 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 witabli+t51udm3nko n lig m *y:ei6+e 79h 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are1 pk-m ; d6lw, wouaiv--kkn)ha $0.20 \; m^{2}$ 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 horizontally at a locatiofaw ;w/hf a; 4tdr,pc,(6s mjsn where the downwar cjs/;4 ,a(fd fwa6mph;t,swr d 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 longde8 p8irjz, /q rotates at a constant angular velocity of 2.0 rad/szp,8/ jrq8dei 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 are5 ,eqy tpcno2eo 99qi.a of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wir r+c6y/*d ad-orivucji k0 f*3e 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 lodxl fb35s/c5ji7 e7uil zs,zor3.p x3ops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uj 5lip3sl5 i bzuxxrsd 7/,zeo.cf 373niform 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 tur4vgjkhp.:/k5 tswkgq4oh *8hns 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 genera- nc6cml6bv5u tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ifnbv- 6uc56m cl 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 maximum wlrewx.*6k ;y$emf$ 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 mot5)y (hfvcm ;noor 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 cx,23iz06 np, 8ijurixbkdg 3operates on 120 V AC, and when running at r3 8 ckiz26p,iub3xdnxg j i0,full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W+ rm3(wg e ),msx lrszv4h8k3c is connected to a 24-V power supply. The oper,3m)w+s 83e hrkl4( mzsgvrcxating 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. tao es7rr2fva1ws s1;: 9*1wi cc,pxn The operating current is 1.0 A at full speed. e cs:r;rapc*aoiwx1t72,s1sv9f wn1 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-k(4wp zy-o5ex uq7(hosv 1 -kvV power supply. The operating current is px(1y ow7 vs4vokk(huq z-e5- 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 reduce a primary volt :+*ct 4ain+*mdntpi)uyz,+bm r(yjuage 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 pric m6p19kfv,sw +t4omjmary of a transformer causes 14 A to flow in the secondary. How many to, 1+m9kp vcjsmw f46turns 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 o; zt80o(z3etn/ rawk3kh a(.j(e wtr110-V primary if the 24-V seco3(ejr/n( r8zz a3eow k0tto ;h.t(kwandary 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 prim0yvv ghf( zq8 ok*tq6+ary coil and a 2000-turn secondary coil0 q8fgvv(toqk zhy *6+. 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%71i-j(q tcmvjvx 3blm/ z.th+ efficiency, how many amps at 24t x 3lj 7 m1j-qbv/z+mhvtc(i. 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 10.0 hfptayvy)t4a2f0(/- t8zeav mA. The primary coil operates on 120 V. What dohyva)f( te/t4 za 02-pv8tfay es 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 ujegr--k) 1 o:ragh*s300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prejks eg1* a)u-h-rgo :rsent 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 coi bsvnv;8yp6kzxdh4o0/ p1. xc l and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currsbxhznc y8.4xpk1 6/o;d0 p vvent 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 100 turns and its secondary has i4/, a4pvb(2 tfrihhk200 turns. If the input current at the primary is 100 4rfbhah2t4 p,vi (i/k 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 turp4zh 6:atyj9k(qjh;* iwtn+lns. If the i9:hwqyh;zl6* a( ktnt+4 i jpjnput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. /a/fzb:v 7lz l7we+9b8rtbmh: w) jad If the power input to the primary w7a w)h8:9r7t ezm/v+bl b/b afzd:jl 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. Thv b41*dp)v30xxu1o(jhug:- tq kq xpue voltage is usually stepped up to 4500 V h1vquok pb4(1uq *x3-pd:)xgvj0x t u 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 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 st8 j*tr943 ks mobszjw;(rhb v;epped 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 libs(r ; 3k8rswz4;bmo*9jj tvhne.

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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. Them5cww 6xp74 kl 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 47lcw wm 5x6kpis not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gj u r(8z* dixo(pmh+1jeijf 7ds: riv5v p0x94enerator 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. 5ijf*m(i1r98pe 4 ir+p s v vhu0jo7zd(j:xdx What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. (zssw.lj ks6)tw,sh c2l1 e:f A generator produces 100 V at 70 A. In of. 6(sl tjkes1,)w sz:2scw lhrder 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 1000 V. How much less powerlw;q02kej3vj x2 gr e6r,yo)p would be lost if the power were transm q 6rjw0k;el exrp3j,2vy2)goitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on1z(marl kc:t a-3,7v tds0xy f a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powvfarx0 c:s 7y1aklztdt3m,( -er 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 o;k(n p lq*kk)a current of 5.0 A. How much energy is stored in the coil's magn;(nlkk qk*po )etic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thbz9 /3jf0 nctn oh0ji 6wuvd50is cir9 t0605vd3b 0iwzhu/ jnonfjc cuit'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 voltagdg.k n aj6*u.ge in an AC circuit 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 ou *+rji3o -zj9cq djop4tlet. 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 plac amid90 b,31lczeens 7uj71deed into a 120-V AC outlet. What is the resistance of the lamp7eds 1i91nec m3 ezujb7dal 0,?

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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 connecteihr):av3jnesj( qwfr3)3*y hd to a 120-V ac power supply. What is the peak current)qy h:r vfsh w)3rne3(a j*3ij through 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 poq i+oz qoqb8k+;q q85rwer supply. What is the power dissipated q+ q8+qo;k8q5 q bozirin 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 resisx bt r kts)n;7i7dd0h+,b1(h pa)ubjbtor 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 resist3/)wwshn ax5nor 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 resil6a, d ekzvmqqmz-9d0qjr9b: xd3 .u/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 Hnf xvn*i ,h,2zz?

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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 reactav++a7n qmr ea)+hf. aonce 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 1whr0ikl,7/ itp-ew s5 4.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanceqhf1dnn;) lk;) m yv5s 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 frmd bqj iv 8)fc:;rg/*fequency of 20 kHz is applied q):v/ fi;8jc*mf rbgd 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 throuj74i4s q;fen 2sxg7r+xacg, egh 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 rej4 +1+d 5u cv9oi vpvknipmy.3actance of a 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-e l.ydfog.k /5 9whor 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 re) -o-c1 guvzdkub*,4 i;rzjeaactance 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 capacitie-nurrjr , (d+ve reactance of a 0.010-mF capacitor be 100 Wr ue(r, -rdnj+?

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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 Hrazxz- o(jk0x,sheu-0alk 17z 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 tbnez9r4 o*tp g0*1k c12.0 W resistance, 15.0 W induc p 410n*zttro* e9gkcbtive 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 vkj) * 40(9suiao /ogvm7jhmaa 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co7 (si*9a)ju4vmk0jva og/moh nnected 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 ;oo.6qx v zhold .7(xfat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se.x7ho(6zovdxlqf .o; ries?

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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 serbn, rjfk;g13;r:o qb 7qi; choies with a 20-mH inductor, what is the impedance at 1000 ko;q3jb1o bhrgc;7n i qf,:;rHz?

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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 i+dju( 38qqx-xj yxup3-py 4q zs connected in series with a 20-mH inductor, what is the ph+ 8(p3pxydq yq3-ju-zx jxq4uase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wit-y5w ob6o b2tz4x;n ggh a 20-mH coil and 1.0-mF capacitor for a6b ob-4;t nzxg2gwy5o total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistt.4jdc o8f 3,2giwlfz s5k k99usytx;or and 15-mH coil to get a total impedance of 110 W at 2000 Hz?j3gw .l4sfy9 u dc82; tzkisk5fx9, ot

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor fw 18ypg4n ijj495kc xat 5000 Hz for a total impedan8ykj9 4p wjg4f1 5ncxice 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 1-lkesj + oc. zn2(jq0 w).rbps00-kW resistor at 1.0-MHz for a tot obkw. j-r)cs02 +n .eqj(szlpal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series x jg(r :a 1w1dxq,)neau1+qsl ukt+2 awith a 20-mF capacitor. What is the impedance at 100eg:l(d+qw+ u1t ax,j2 s1q uxk)n 1ara0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tot(4p . udicfzp;3 )gzhzal impedance z)dpf3 .uzpizh;(g 4cof 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 wit zg 6x)kstm/+gh a 10-mF capacitor at 1.0 kHz for a phase anglem6+gts/ xkg )z of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistbf: 6 h*dt,z,emz)r o,j5a gekor at 1.0 kHz for a total impedance of 45 Wj5*z,g e, m tab6khdr z,f)e:o?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phoa+w) mvn1eu /ase 1/va)um new o+angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistorfk6cx/:w/l.kx xq f.c, 20-mH coil, and 1.0-mF capacitor are xf/k:wc/kc.fqx.x l6connected 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 conr nqm /nn;ye4gvw +a./sists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The cir4./ aw y;m+nq/vn rnegcuit 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 reaca u-9w6i-wf5oevs)kvrt dd q6*- wtq-tance 30 W, and an inductor of inductive reactance 39-s-u6 d6fri o*d -t)watv5e wvk-wq q0 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series7tt0xc.jhe b 6 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne07.jxe h6ctbtcted to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500(yxk)y l/o x+x-W resistor for a phase angle of)xy yl +xox(/k $40^{\circ}$ 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 = 20.0tr4+ ,iulbg l- W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power4i,g llbru+t - transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W xqb0)va* 0qky inductive reactance, and 10.0 W capacitive reactance, wh k* 0vqy0b)aqxen 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 ACv;4kh qn x-rq62xla0jvn a0w 3 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 ;u27 of qyc2z p9y. ows8(nqfaan impedance of 60 W and a resistance of 30 W. What is the power.zo w( y;9a227posffu8q ycnq 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 circuit c7ww o 9lf x 737azs1dqpdrh*f0ontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl* rx d 3hffdws79q 70az17opwly?

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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+phwimcpn8pvc z :6* 1 coil in series?1wc*6pmpnivh +pzc: 8

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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 resonant fdyi x t*/ia725l4tvv7u u n:p0bpzba9requia05pv47nait*z9ub: du v b yt/2lxp7ency 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 wse bbg qn fd;a.738ao5*fh+ 11wxjik iith a 3.7-mH inductor for a resonant frequency 1k ;sb5qan oie*dbih+j3g1f.8 7 wxfaof 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 aqdlmqnasl/y5.ikb -(8e( g c9 40-mH coil if the resonant frequencyqdl9s.5a(c neilq 8- ykgmb /( of the circuit is to be 1000 Hz?

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