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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 unit4 1huttxe *0:mg )xefbs 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 inductiona2+d xf i0dd7vkk31/z4*ytk :b vzzyl states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in 5qa398jmbq 2ztracgp kj72+ l a coil produces what kind of change on the ra mtlkgb 53+j7az2pcjq8q 29 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 magnetr jho+orw 1.r2ic field through a loop of wire produces what kind of chao2w1h +ojrrr. nge 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 ofo; ,y/ fl9b:up3s7vk2+ivwhjku : i cf a loop of wire produces what kind of change on the induceuu,ypki/vkj2cv37 :+bf: w;fiso9lhd $emf$, 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 fedh 8dzwwgh9t 0r:z0+ield 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, t6zubwm + y/c,)sc1ot 8ya9no ohe direction of an induced current in a conductor will be wn)maos/bc,o+yz86 y 9oc 1tuthat which tends 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 horizoy p3mjk :zy46vntal table. A bar magnet is held above its centek 4 zjyp:6m3yvr 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 ocf0pikn. a ;p(u)pb :hn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaa0npf: pip)chbu.;(kches 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 atk i2f4v6qb q. region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fromti kq2q.b 6v4f 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 tabl66bojylj h5 u*gw w9:pe top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows sho jl9 upw g56j*6:wybtronger. 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 rm ,*rnh m)mh:vi-54qst 6xgntegion where the magnetic field points straight down. The magnetic field disappears suddenly. m-qm, )sith65nv * r4h:nxmtg When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and car+1 pr2o8us4zscm9 orbja ,2izries an ever-increasing current northward. Two coils of wire lie f1scz8iu2j,o bs+9z4am p2 rorlat 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 n,;u h* ixy5rniorth pole entering first. As the north pole enters tr; i yhx,5in*uhe wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatq4.7rhpv6mn/ zn, k qqed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotationphnq.zq64v qkr/ nm 7, 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 i:m5 z 05hc 5ynoneoyb1s rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnhne5 o:yny zo cb0m515etic 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. eyt7nk-h.k3,vlw:) oiolqg x x- 9ur4
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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 ta gy;;:v;e z)fn+fjmf;k bqb0a9 fzd)hat 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 mag-5i is9bkc i*m,tq i*rnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west di* +g*9yjxkgy krection) is moved northward at constant velocity through a magnetic field that points straight down. kyj *g9x gy+k*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 velocithsedng* ,za+y g vhy;v3x*ogb8,v9 f.y $\omega$ 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 transfqe a7d.-f )2cjnu;jc eorms

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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 revolutions each syy3zx el6m56j0cb./h (puoek econd. The frequency of the3mh0 xy 6 euek. /clbpj65zy(o $emf$ 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 usjm4hum39y2 seu8 mth 8ed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tq v3mxx9sl5x )hat

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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 tcbzh qcimhk/ xq-c 6(w7)1nf( he secondary coil contains more loops than the primary coil then it ism-f17iczqb((/ c wc)k6xnh hq 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 ldvh rd(g;90*.w) vw.* vn3lzz aaqqjooops than the secondary coil then it03qrlq z*v9nd ; v d w(agw.h)ov.*jaz 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, themq1a26dnn9m 3*.qco f yz1bqge7ue5d power 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 cirse7:dgnq h7( ucuit,

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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 ar83qd kgm-opf- l0bl*y e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thmkol*q3 0 d-glfbp -y8e 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 c l(h(z pg0vmg)onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batteryl(pgm0)g zhv(, 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 indkr1qt:hwwqw 9o /ta.3 uctance 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 w s,/9y.ev 9simhe ,*;t saal gxz7i6lL 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 in seriep99h9 gqogs2n s to a battery. The time constant for the circuit represents the time requi9hong2qp99 s gred 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 in series to a b-+u kkvl1l nwhnb94m;attery. The battery is sudwhmkunk-; 9vl4 +1nbldenly removed from the circuit. The time constant 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 ukx9ez7 3deq c8nits 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 this circuit, tmfx ns /h63r*:yw7ahta m.dd( he 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 connecteidfec+h9mwv3 7hz )s; a03 oqgi4;ooed to an AC power supply. In this circuit, the curren0aoe osfg; 7qm whi+hvcieo34) z d;93t

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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 w2ug c un:-68d ndbf2alhen the frequencyclg-6bund n8: f au22d is tripled?

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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 *bdppqtm (zpj*8mhtl /2 ka66 doubled, the inductive reactance o8z6pkm b 2 md*p*t6hj/ta q(lpf 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 ix: n3xs3(lj vvnductive :l svnvxx(3j3 reactance 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,b*b s*f3 bjf(c the current3j bcb(*sfb *f

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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 the frequ9uu + tvm0pr)jency i )90pjmrtu+v us 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 across a capacitor approacep/yu/ v nkxf) 0n1(lmgz3o o2hes zero, the capacitive reactanc )kemgnfv3uxon1(ly / po0 z2/e 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 v2 x)mosbx7f 7jszmg9: py*am 7oltages of the inductor and capacitor in a RLC zax y7ms:po ) 7b*gm2m97sjxf 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 4d 91bwcp7y/etkx +si0swjc- circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedanc+3h -plnmex 9gyn( t9wr nl-e:e of the circuit increases if R increases. When is this statementh3 n-(xtgyn9 -rnw:llp9 ee +m 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 impedanc:qq2azmx ja2 9e 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 increas;so lsh4s1l g(es 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 kbes0h m7rz k:r +8ge predhr)t +321bmj:4ifan LRC series circuit, the resonant 8i7 1jph gfe +dk :ez:hb sr4e+0)br3rmrtmk2 frequency of that 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 d(z l44phkpi)r riven 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 RLxku:o,ca2 9s uC 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 mvtd v+5: o:et omk(g 7tv2fu3q is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thedq 7m :+koo5ve uf:tvg(3t t2v 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 pz8 y(e v n5py/ xdz3q3vqu+y.in a uniform magnetic field of 0.20 T. Find the magnetic flux throu.3 +5y/unqyvxz( e p vq8p3zdygh 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 radiuvc+oxm/+f ox2s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of tox/ mvcf2+ xo+he 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 abydb5k;fj wv+ml,c (v t* n52f1 q)oaof 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 changes nik sk6. m8fgzdt: 99zfrom $4.0 \times 10^{-5} \; Wb$ 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 ou1 z* ,i9gkdkkf wire 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 ki9,ku1 dkgz *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 a d0dkr: e,.yn *ms4by4n.ao wen 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 i7wakvzh0) 63wvy 0sne6 c-rq 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 flies horizontally at a location where theyeqylbi/j -7e+ z3cyyd/5j)jk 7o/ ac downward component of the Earth's magneticcyjkyi-3qa 7/j/ j5)+eeyy czlobd /7 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 afu*b a8fs,ay 2t a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiel2f8,aub*y fs ad 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 lxy2f +cm9a1y50 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 tnlbzb1 pvvr9 tv5* s20urns 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 loop is 12 1dj)0vyph3yaol x fag6(h 7+vcm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 +60dvh1 7gy)vo3fa j xph(lyaT, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o/)iov;w -e/h3jp 3zxw yutmw/f 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 simpl3o/xzoc r uj;;i/ba f+e AC generator with an output of 12 V maximum when rotate3i+;a;/ /f oou jbxrczd at 60 Hz. A 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 gecmqca 5i t(c681528q mc lwgpwnerator 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 havba* 34r1ohwjulm0 jn-e a resistance 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. k*,u4*i otfca ,ua qn5 The motor operates on 120 V AC, and when running at full spnq,*cuo,ftaai * uk45eed 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 po2o+7uhn i4gb axcxl, 6wer supply. The operating current is 1.0 A. What is the start-up cu7cu lx4oa2hg ni6+, xbrrent?

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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 id,5 ozdm eiwbn1qg. .f5 v.zy/s connected to a 24-V power supply. The operating coqi.f nyd vwdgz/ 5m.1,.e5bzurrent is 1.0 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 internaleu ek 9dmzoh1oy4jju 9 o:746f resistance 6.0 W is connected to a 24-V power supply. The k9eoyoejf 6 ju1o4:z9u4hd7 moperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce alj9vf.m s uvt(g:l5m2 ;ih7qr 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 transformer causes 14 A to flow inse-+xjex6z u9 the secondary. How many turns are in the -je 9x6xzu+s esecondary?

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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 m(3 rdc c+wt:16biopivt 3;kcfany turns are necessary in a 110-V primary if the 24-V secoopwd+6ikc3tr1i; vc3bf :tc(ndary 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 primary coil ;g8jpi1f d/e 0qxf;nli jt 7n2and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the priqinf8gj/;p e7; j ftldxni210mary?

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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. Asm-d9, dd .iq 0elsqxn:suming 100% efficiency, how ma:9,md dn-q.q 0xidel sny amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transform6;:ctyre c tn*er provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drac;: ety*r6cn tw?

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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,yf13,j9h+kxww, xtu;x ntf k and 300 turns on its secondary coil. If 120 V at 2.0 A is appl9;n,f+w1,yk w,xjttfu h3x xk ied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coill*ky hhda99 -qsc3 jl( and 300 turns on its secondary coil. l9jhha- k9ys(lcd3*qIf 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ha *d x350y4oblxqn(a d vda9zy4s 100 turns and its secondary has 200 turns. If *zxdy04 nlq vaydb(3o 4dax95the input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secoa y0nt llha(:f zldg:34l op)9ndary has 200 turns. If the input voltage :agl4l h09: fo3(pldn yt z)lato 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 ij4pbg-lv2 7-e+ f oks29kwf h) mte-xets secondary has 200 turns. If the power input to t e2)9k -tfeveb-47pf 2+lx sokwhj- mghe 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. )y c urfm7o+: q.8 roy)hjs.ku The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powe:y8uyks h7mj+f)or.u) . qcr or 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 fa jbr4; b/n)rcurrent 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 thenbb) r4 fjar/; 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 voltage is usually stepped ,iuc9hz t0wu 66s cn7tup 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 i6,t0 uh76 n cs9izuwtcs 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 genevyj5u ( km/+;y;igsserator produces 100 V at 70 A. In order to reduce energy loss due to heaty+;yi/5ves( mkjsg; uing 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 i:avs) . 3i(/j g)p dc:ty,yqzod:ssphas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with :sa)isdcp:ovj qpz 3gtd,(y:i .y ) s/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 lin4rlylgw:n+*nn; q 9zzm4ag l /e at 1000 V. How much less power would be lost if the powe:+4 9/alyq4 *lrzlgmnn ;nwzgr 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 generator is 440 V at 20 A. It is to be transmitted tk pc0e;/qaakog3(4q on a line with resi3t4 q pkqe gc;ok/0aa(stance 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% 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 cb)dl r6c .ow8bzkx+.eoil's eb)lcdz+. bo rw.kx6 8magnetic 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 cza wtcq q e32)-l.rmo(ontains a 6.0-W resistor and an 18-H inductor. What is this circu m)ewtcqr3.z lq-oa2(it'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 ;y y2b;3zalo 4cii 8loAC 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 1/jchdq/- i*2nb ugns br(i2r(2/kak g20-V AC 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 thel-/ xv*2+f 1j9mics v -gvxpzl lamp9-p + *cm-xi flvl/2x1 vzjgsv?

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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 ck:gp /,rielx + eq/n)lonnected to a 120-V ac power supply. What is the peak current through rxig,l/e p/ el+k)q: nthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. W,b8hk wcwy:aol;.(pu x9h /xvhat is the power dissipatxplwbh, .w 9uahok8;/yx c( v:ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis-u28 qu( hwl/ux; tdyctor 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 resistor l j+9uo1l0- yy1dp u ;rnm+hwois $I = 0.80 \sin (240 t)$. 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 resis9nx3jb ,cjt s7ov0t) gtor 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 3a:s xlgvhrmcwfp0+x50 s7,dnductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 100pg jmj9b wf9/ ,/n pin32lkntk ox0-6f 1-gmsm0 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-:a yb:;rlr jhxh 3+fkp:c, -zeg6e1v nmH 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 rea8(biol9.ri, wij vrp.bl ej,9ctance 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 inductorel kj- 9inr9p0 /zvvw5*lsj3r when 120 V AC at a frequency of 20 kHz is applied twvip/e-jn*llvs930 9 rrzk5jo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 13t pxw/yws vk l9uz8b4dx,d., 10-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 y aja:3)vns(u 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 hbo9(e*bk:g 8phr ek h*ave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitoq/4++jl tipl73*ua k xqpjwl3 r 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 reactade hh nh4gizmc 2:ss.+lv0: sqv2 +an/nce of a 0.010-mF capacitor be 100 W?d:.nh m ssh e+:nvszi2gacq 0h2l4/v+

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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 Hb+o- ejs9l,oxz 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 resistan u9 (mqsq5s+a4 v-vjjuce, 15.0 W inductive reactance, and 10.09u(+u vqa4jjq5v s-ms W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH c tkdtt g s4fa(l1 jvcjt3fia4b2+(w06oil, and 1.0-mF capacitor are connectdaa1ftvj cfg 2k wtj43tbs+6t4 l (i(0ed 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 1500msaw*jqj ;(9gv. .( .vmbgtv*l6xx hb/ hqef7 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series*9*slj6gm( wv.m /bqqajxb. hf t(x v7e;g.hv?

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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 connecte r3z+)kt:,g gmcr7miwd in series with a 20-mH inductor, what is the impedance at 1000 Hmkcggr:t w)3r ,i+z7mz?

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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 2 cw2hkwqxvp*9eeg:w bs 0h: 6a 20-mH inductor, what is the phasep :k:w026x9c*g2b qh eswvw eh 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 need-)5y q fw3vyrved in a series circuit with a 20-mH coil and 1.0-mF capacitor for a totr- yqwvy3f5v)al 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 wd8u f oif-mnwo7y;6+ bith a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?b w+y-u7n ooi8f dmf;6

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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 x -rz*-je pr8 wj)vci/8x v0em+yma.zwith a 450-mH inductor at 5000 Hz for a total impedance of.j+ z mr/zx v)c-m-repiwe0j8 xy*8va 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kpuhf +h dz,;gw8:u lt60jce 4gW resistor at 1.0-MHz for a total impedance of 150 kW? 0h+gu,g4e;wd6u c hjl8ptf z:

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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( gmy z p92;yxfjf ih2;mlvg:, a 20-mF capacitor. What is the impedance aty 2m,xj ig;yph fzvm9(2lf;g : 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fwb g0alm,tf 4b,5wjk2or a total impedance of 45g4 ,,mkjf 0bwlba2 5wt 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 seriej)8ta9 rw mfl,74 rcyrs with a 10-mF capacitor at 1.0 kHz for a phase angle ofr9yfwtj8a,7cr4rl )m $40^{\circ}$?

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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 ime9fn/ )k+446 ck kuor,usekkn series with a 30-W resistor at 1.0 kHz for a total impedance of 45kk+s ock9 u6f4ek,ue)n r m4k/ 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 c4uwmz ux2mt2* :3eotx/ 0rngoo 5qy:100-mF capacitor at 120 Hz. What is the phaso0g/24xxoqtm3 tcyremzw u* o::n25ue 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 resistor, 20-h6c8 kq owf+l1mH coil, and 1.0-mF+ kw618 ohqfcl 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 r vks g55qawz;5yk b-9sesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the c59 5;k 5q-zgkssabyvw ircuit?

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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 reactance 30 W, and an ind96j*ok9w 6tudc f*pzouctor of inductive reactance 30 W are connected in seriesu*z 9odjfkw ct6*op 96 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 seeut20pcf .u/j ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to tueuc2 0/p.fja 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 necessar e:6h:u ylw)ouwg4set3x3 :4ix n-jqo y in series with a 500-W resistor for a phase angle of) ugw4q6ohoxi:3sue jle4 ywnx:-3: t $40^{\circ}$ 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-mmuf4v278mwoaf,a cc +zzh+a / H, C = 10.0 mF. At what frequency sh +u28cawzcmova+z /m74haff,ould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wit .+oswq72l+:l n/zc qgdtpy+ rszz44bh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit7z zb4g4/.+c+ssdy 2qo rn tzwqll p:+ is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is 6ljey.kn7 0lx $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 uu8o 4yoxmf e,0nbt s qqmz 32(et,6o-W. What is thoqm,m3x2etb- on y,4 t6usze8 (qfo0ue 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 for a series RLC 53b7ulgpzenl)m1y 3u circuit containing a 50-W resistor, a 10-mF u37g)unp3 ll z51ebm ycapacitor, and a 0.45-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 fv y: fsv/-s 4*scxrrz7l5pms: requency of a 1.0-mF capacitor and a 15-mH coil in series?y*cmfpv 5:rsssx-s vl4r/:7z

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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 capacg4o,u2o8z ln sitor for a resonant frequency8o24 n,g oszul of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH i2 2j ,g:y6z6mmbj b7zblbsb8 snductor for a resonant frequency of 102jbmgbmbbzs sbj 26,7:86z ly 00 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 y2o5zk :6wfy qbe placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit6 y:kwzqfoy 25 is to be 1000 Hz?

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