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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of tsiq e2o75- 1ozvxxr 4magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the otqgy3p (et ;j2cz8m6$emf$ 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 ws mxup 1edj0vo4 3 +*ut:rq,gin a coil produces what kind of change on the inducedq,0pmdxw ve:g*u43j1 tsu+o r $emf$, 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 of wire j5ar jq zxpfp(*-wd,s7h,e 7gproduces what kinj rfea ghzs , (d5xjwq7-p7*,pd 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 aybk4m b7qyw8wn/:p7q loop of wire produces what kind of change on the induced 8 ymk w:/7pnw7qqb4yb$emf$, 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 fieldc;ai )uvdja9, 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 inp.x 1l :bzn+od aj-6pt a conductor will be that which tends to produce which za pt6+xodp1:.l njb -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 magnet42 ) ajfwgbsv)6jff j5wfg+,p is held above its centfj,6vg )+jsw5f fa fjg)2p4bwer with its north pole pointing down. The 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 horizon9: joz2ir0 ;in;*slu6/z ta s fmec4tbtal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above) l6sun* /cztas z;r;tmjfo20 eiib49:

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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 magnetibr 00(54yl c 7m/xucaubjpcey, txu0ua8 +y0cc field vector points straight up. The magnetic field vanishes suddenly. When viewed from0+a xpbu8ra xy 0 l/cj4tc0u,(y0buucym c75e 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 level yos5qxk qb*)i- d+ta)()h.tn pkix l 8table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above,-xqbqdk.ixs)ta)nk+ 8 hi*) yp(o5tl 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 tkqjwv n2-/t(ebk,y1as t jf:rta( +-nhe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the :bwf nsn + t/j(,(-vtj2yaaqk ektr-1induced 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 jx51k04iy2u ada u(tc on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tajuaa 20 5txu4d1ciyk( ble, 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 w+ b5etcb n4ze9 j3cf/rs ud97yire with the north pole entering first. As the north pole enters the wire, the induced current9yj/zn7bb9 etf 5ucs cd3r+e4 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 a1n y t7ryyql06m2o0 ilxis whose direction can be varied. In a region where a uniform magnetic field points straight dow6y 1yyilnl7o2 rq 0tm0n, 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 ab: t3t3gu0zc noout an axis whose direction can be varied. In a region where a uniform mactunt:33 zgo0 gnetic 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.q k+q5r- rexq7
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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 tha1x4ym:v b-lgu140fvgpf ispawj b *06t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic bb uj7 oz)r,f+4e h.zjfield. 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-west direction) is moved northwardssqwo9z ex,q bz/ (*4w mstd1; at constant velo* bs d9xm/wot1,qs ewz s;4(zqcity through a magnetic 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;aww56k t*-rgqpcg (c 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 t1bfe 2k h.pp(fransforms

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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 revoluzpb.-mqg59 2fjy (faa tions each second. The frequency of th-mf5gqz2ab(yfj . 9ape $emf$ 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 g+3vo4he m/gf gq7g-8qehvn: eoog4 0used 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 de7x7e,zm :4 t0nhyfnf zvice 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 ther+e j1h, xeobjcxzl d (s;peq6n64v/- primary coil jlo6p rj/cv 6s-;e1(bqzd4n, x eehx+then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loop 9l -mlp67vaozs than the secondary coil then i7-va pl9m6olz t 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 inputy h0yid 75kgdws /ka57xd b)o8

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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 cirn m5 ym2l zv;+ozkha4.cuit,

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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 copb:9 4vmsm xtuw zy.(9 :yjw6gnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is .bpu 4:y69mzs y:w vjtg9xw(m

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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 induqlav 0zdicf*s- v -l7)ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vold z 0v-*sclaq vl-)i7ftage 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 inxe9xfic0 ja93i0zdw4ductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R o.2wev 56sfdbks .oetkt1o0 91vl1dqis 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 bh 4 y,sbnu:-tlattery. The time constant for the circuit represents the tiby:nht 4 ,sul-me 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 connected iep x9q:whq )v-n series to a battery. The battery is suddenly removed from the circuit. The time c-eq phxwv )q9:onstant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unn0i eogj kon1f)j-yg3c73f vnedl1s- 1 i, kj-its 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 a2y tzxq/bb x5q *7tw ;jfdotpt; 5dd80n 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 power supply. In this circukaw7mp.:hc*d tf2f s-ix7 vt7it, the currentcx*adk7mh twt7 i.-p 7f2vs:f

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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 ct-kdu om0m9,qm4 zsoc jaltsq4*9,-circuit changes by what factor when the frequency is tr 9mzm *ktad,ut0m 94slo- oj-4qq,c csipled?

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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 vl q,oo6*emldh 36ua z:oltage across an inductor is doubled, the inductive reac zl 6d:uoa*el3 mo6hq,tance 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 5be .n76 z oavevb+r 644qpvpginductive reactancb vg7.6 o4 avvpz+rbe4p6qne 5e 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 circuit, the ipp3mvk 0tc*+ j (hgy2currenvtck py+2g30 pj(i *mht

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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 ch9t3 m(d(cuse fanges by what factor when the frequency 9t3 u(f md(ecsis 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 acroi*fhwiq;k:p0g1s 4ss ss a capacitor approaches zero, the capacitivk4spifsq*gwshi0 :1;e 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 the voltages of the inductor and capacitor in a msg-n6k cr.p0 RLC se s rn-g6p0.cmkries 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 circui+ 7rqp+tf ox:zo5o2imt 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 circuit incre)zb9yhr 3x5)o1sry a uases if R increases. When is this staterbr5 xu y)asy1)oz93h ment 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 imp mubj9-i qiuy*+. ymz4edance 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 circuyk:3 fquwun3a8m g k7;it. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double q qp-eodq; zx0 3o6nha1ck7 k8in an LRC series circuit, the resonant frequency of that cickp-6 qakno1 0q qx37h;eo8dzrcuit 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 circuoj -5*shx9bu-0ow db mit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit mrqwy r aq;+-d /76wn4x w4tsyoccurs 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 radiusxwi7 ulw 20m-z 0.10 m is rotating in a uniform magnetic field of 0.20 T. 7iw2 mz-0xluw 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 in a uniform magnetic field of 0.2 ,y h1rn 8p:nzlapn/z x 9kr276*eubjq0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendick*y h1 brralz72 6pxznpq,je:8u nn 9/ular.

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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 z.yam s*4if6q uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lz64 myq.sif a*oop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is red+h:mb,rkktz ; d2jz k1uced 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/r3yklff2 a.h 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 with 89vveekg;7odtcc:+ f;y ( b e0n,t nfusides 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 (utcec,+; d; nftg e9kf 0neb 7v8vyo: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 arewo kval),u 91ca 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 3s.n d r: 4hbkmps,-hmarea $0.20 \; m^{2}$ 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 location where the b,6w mxez7o (cqf z*m;t.vn,gdoqm ocx,ft. ge(z6v,zw;b n*m7wnward 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 2c*do -+ r3ipypsqs (.m.0 m long rotates at a constant angular velocity of 2.0 rad/s abo cp-p smr*oy3(. qsd+iut 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 hf ) 4c4kzykagtf.f2 :xas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areaa wmf 659uxr vyn) mg01gd1w8y $0.090 \; m^{2}$ 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 pmhc 3/69 ibmxloop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If thei hpm3b9m/6 cx 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 hyf/j q,e1rw:b4 o hf1a)am; vof 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator t msf, :rja2tm1uyf7da76nu0 with an output of 12 V maximum when rotated at 60 Hz. A2r mtn0s a j6duf:a t,7mf1yu7 magnetic 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 generator with a maxilj0epds0 v+ l9mum $emf$ 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 ongn0u ) kkhj woo(r9/y8 $120 \; V$ 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 opera4/xrsa8 -uenutes on 120 V AC, and when runnnxae4 rs u/u8-ing 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 W is connected to a 24-V power sy grf5by6m 8 lqhm1z,lf6 io(sf:w;w0 upply. The operating m mlq0 ,r8soyl16(w y 5:hf6f;bziwfgcurrent 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 jcmby, 15kjd-lc r2.rk0dp x3power supply. The operating current is 1.0 A at full sd cpk 3.cyk0b1r d,r52 jmlj-xpeed. 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 nunz j2 rg;0(q24-V power supply. The operating cu rjuzn(n q0;g2rrent 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 rb0ei/bws -fa3b. b*j(,rddq 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 z:d.kw):maw .a-: yxjkutm t: primary of a transformer causes 14 A to flow in the secondary. How many t.:t:awk jz k): yu.xwmm:-daturns 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 primary if the 24-V x2q ;9au mvu;/sti3jksecondary has 100 3 mxsu29q;ik t/;vjau turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secoa b:qh*jb; ;b9n o9 k2fircu9indary coil hoc9q;ak rb *njb9i:9b2iuf;. 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 prima:gf;v+ e 3ebc0pb :l;kxwzrc3ry of a transformer. Assuming 100% efficiency, how many amps atcbwr:+;zb ce303x;fle p vkg: 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tran fhq0h57o5ju 92uj9xi:tb q *3rdplhgsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does h7 05u gf9u x2 tobj *h3ih5p9rdjqq:lthe 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 30,. d.yf (jtofh0 turns on its secondary coil. If 120 V at 2.0 A is applied tj f.dh(yf,ot .o the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primarc*ii / y.d,k4kkflh3 ly coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whatldf/3y,.klkc hi4 ik* current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If )v8gzxk3wa 6p the input current at the primary is 100 A, we can expect the output cup)kw a3gv86zx rrent 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 and7 z+i 4n9yzlxz its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the 9z 7xz +nz4yiloutput 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. 3vk8f .yzg(3 wz5newn86ly hx If th5(zzg vn.xyf8 3lwhkw3en8y6e 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 4mdqsl-4imi, 0la6 rgz wx+j2 of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.zi0wm6qa+li-rsm2xl 4,dg j 4

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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 stepped*/j0 7t uftm1k p2zmvw up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find 702/tf mwmu pjvz k*t1the 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 at 120 V. The voltapr1eoz 7fb )k/,pa*osge 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 *e br,1zkpfa /os)o7ptransmission 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 lofcv 8/8g*kthnng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due t hfvtg88n /*kco 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 line 50 km long has a total zmqs2 0xua*0y zcq:;yresistance 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 10yzz;*xas 0y0:cm 2uq q0:1. 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 transmittedky )3z.s(veh q down a 6-W line at 1000 V. How much less power would be lost if the power wzq.3s e)kyv(here 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 generator is 440 V at 20 A. It is tqvuz;oeq.7y1 y0* djvo be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up withojyy0v ;qe.dqv17 z u* 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 in the coil7,pgc2o,-k4up;/f z ia qnx lcq l2p 4zi/-p ckx7 fcn,;a,ogu's magnetic 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 resisvm/gv, 4r:phetor and an 18-H inductor. What is this hv p 4,vme:/grcircuit'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 aia+ux apct,s4wur+:* n 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 vuqc (b u7yo-,outlet. 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 resistance of thz3i 4z* o6v ,cyj),ohljwd qo6y-k6q je lamp?,jj3ozv-* ic y4kh6 o 6,o6wjzl)qyqd

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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 powb;6) 5w gwnysrer supply. What is the peak current through the resistor w;wy s5nbr)g6?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the poweimfjxnqqa4r + -4cf-d2m59u k r dissipated in the r-iunqf9 2r5-f4kaqm +cm j4x desistor?

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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-Wi( am8qm un4tap; ;:js resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistod 8zl4wm:1byxag 0yc-r 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 resixd9-ibj. 2-r7 jcouyt 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 da20 eiw( qzs lh4b7f)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 coil at 1000 Hzm2opi mos9 m 4qhi bp0ib290now1l ;(s?

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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 14.0 W of tpa;pr9h 34mtkq 3ux: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 1q*rx o/cj 4/ne57 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 5ecvt7d5- wur ws eukz-6 :x-z120 V AC at a frequency of 20 kHz is appliuzk-r e-sudwwz v5 -5 7:etxc6ed 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 2.50xk) q ,e*,jwbl-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 a 4.7-mF capacitor at 10 kHjmq 6c-r87zw;qgb3 rnz?

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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 hav8 -x*-idoj2ld iorks/qn1 q h/e 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-: w;q/tl +(wdcv 4wdfsmF capacitor 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 reactanmw5i p( s0vnx*ce of a 0.010-mF capacitor be 100 W?p0 5(msixwv*n

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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 througaz5*lim*ke 0gh 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 ofy s.;s* hi2jnk an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance,.2shkj; *sniy 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 1 0 m/ fuv*yp)n-f1ptwz500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected intf wz)1f0m-n yp*vu/p 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 an (*xwotlu0.1bcgvj-p . z, uvg6erq 5t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitovx 1u,b g(u* rpzw.g6j-.l5on t0cqevr 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 i cblm sb rdb(4)m,:7irn series with a 20-mH inductor, what is the impedadmbm: 4 l7rs)i(bc,r bnce 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 i3pz xt0qko jx9)epc-q) 3ig*ys connected in series with a 20-mH inductor, what is the phase angle at 100t cog-je33x)q qzy p)0 9kp*xi0 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 seriespe5 i .duzseg2e*ga8) ec 7.uz circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 158ps izug)* . 5ue az.7gee2ced00 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 resistlaj: ka+(: gztor and 15-mH coil to get a total impedance( ::kgajaz+lt of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor aegbcdm*dq/7d: z2lazvbm,doc4 .1 ; et 5000 Hz for a total impedance of z*dbd.ee/agl1:dzo, bc4v2 mm q;d 7c40000 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 at63k*l+8k m cm up,buxo 1.0-MHz for a total i m38xu6o,p*c bul k+mkmpedance 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 with a 20-mF capacike(rl gve-g:( tor. What is the impedance at 10k( gvg-l(ere:00 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 tdjk7bzk. ;u9mbh 7f :motal impedance of 45 W?d:m kf; bm9h7u.bkjz7

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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 seriesp,imasa lmn mx2g1vjl ( / an:+j8l a+,0m)uon with a 10-mF capacitor at 1.0 kHz for a phasel j2 v) agpo1:aj0+8axilm/ lanum,(s m, +nnm angle 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 axx+vw )phm 1x: 30-W resistor at 1.0 kHz for a total impedance of 45 x+v :wx pm1h)xW?

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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 witty (+n8fjeazl , 2sf:jh a 100-mF capacitor at 120 Hz. What is the phajn z:s+ la(t,f8 f2yejse 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 15+ex/6:i ,ov 6mckpk wa00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacia+veow/xc,6 6:kmkpi tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a a umftd ;nu42,u7g3br0.350-H inductor. The circuit is connected to a 12bu7udu2ft3a r;, n4gm0-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.z4e ov 5pue emd5e)(s capacitive reactance 30 W, and an inductor of inductive reactance 30 W areveeo(u)4e 5 5md ezs.p 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 series RLC circuit containing a 50-W resi 0;glkj -7xo1a/k xw;lo:n dzrz* /unxi(l pp*stor, a 10-mF capacitor, and a l/;:l0z1(dprjkox* pa/nxzk o;- l gxwni7u *0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series witgxbb7b u8:.ip h a 500-W resistor for a phase angle ofbx8g.ui pb 7:b $40^{\circ}$ 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 )fwyqct: bn*r u7 d k9r-wgj wf-(z3v8mF. At what frequency should the circuit be driven in cv*:rwn uyk -9-g3dqtjw)f7wfz 8 (rborder to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 159;e q6 kzvp/ks4str3h.0 W inductive reactance, a/9 4q6 e3;kthzpkvsrsnd 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an d*1 zbt(xtq5. t ;c6uqphil;wAC 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 a8 jfvrfq,b+kwq vl60io+g cl0k*+h 9rn impedance of 60 W and a resistance of 30 W. What is the power fa q0kbof8 gjc,+rr06qi +lw k*+f9vlv hctor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resfazt vv .e3zi 11tx.umr(8fs9 istor, a 10-mF capacitor, and a 0.45-H inductor, when connectau9.eirvtfm8x(fz 1 v1zs.3ted to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mml 4i.cv )tv+c0rxnx, *u3cjzF capacitor and a 15-mH coil in series?u+4 )cxt l, 3xn.z*i0vccjvrm

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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 capa4qekto 4q k;0 jh,razt v0gg)/citor for a resonant frequency of 10 k0qzre;4ktg4/j0,a) t hg qok vHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor n3lky-eygl-9h9v pt4 5d -uxs for a resonant frequency of 1 svlldnyh--5uxpt3 9y e9 -gk4000 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 fm.j un7 qb6+kresistor and a 40-mH coil if the resonant frequen 7 .uqjmnb6fk+cy of the circuit is to be 1000 Hz?

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