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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnety)54eyg2x pto x4em q3ic 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 indu mu2u1nwkp)z0 ction 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 a coil produces what kind of ch9 f +0wpdye p8uj,ye9xange on the ind ,x8eef0 dw ypy9uj9p+uced $emf$, 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 produces whbgaft0r67 )w2yzd+bs(saodg(n) tq +/7 n jg eat kind of change on72t)/+ (orb)a s wben sg+gyf7qzd(n0dagj 6 t 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 o.phhqv.fe iupm 148 ryk b-5t9f a loop of wire produces what kind of change on the induryt.h1v5qf hup im - 9ek.p4b8ced $emf$, 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 f0h7 jyc xn , 9ppzfpxz.l+em:9bphg +9rom 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 lawp1fg d.bgyzb61pw):1et ihv+zr1ho0, the direction of an induced current in a conductor will be that which tend+vzz11. t)10:yhg dwf 6bg op1 phbries 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 flaafu5 af 83dmqh+mp, y,t on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induceh mp+y8,ufmafd, q5 3as (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovevn16x6wew caq*iu 5v) its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducesvwnc16a xqe)5* i uv6w (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 reg9px-jy6j.fnrc1 mf8ga5nj /o tm9o ) wion where the magnetic field vector points straight up. The magncja5jnmjt /9n8 pf1f6y-m9go w .)xroetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where tcis8dks +aj 41k4kb3phe magnetic field vector points straightjd s8bi44sk pc1+3k ak up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table topsj ngn:cd5nyb*+( il3 in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fieldisg j3y ncd*5b+n:nl( disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an j 3woe/ o(/lggever-increasing current northward. Two coils of w/go e/w(gjl o3ire 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 vpjzc:k.(.yp c3v le 80 tyb7nentering first. As tp7vc b:8.0ktz e.vp(j lnyy3che north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whdl)3oflsauj 1 +- phx/4ec; i kujr:a:ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tapf1+ - a :)cojjrh/ sui:ll 3xdke4u;he 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 angulaqar+0(h1kp9 idfv.n f// a zzer speed about an axis whose direction can be varied. In a region where a uniform magnetic fie9/zq1e zf+k idf (/rnaavp0.hld 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.-vw+nd:nlf4c (p3*fkyx, qp l
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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 a0m wp9x9t/xe6ggal.tn $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across afh-:8 zls cg6k magnetic 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 direction) is moved northl8 xg nx*upb4: je.ry4ward at constant velocity thro4xxu*nj 4eg8.p lbry :ugh 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 ox-h/ (ijc5riangular 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 transfo*wmw4y 7sp*(rxmuuy f;0.g mii11tl4 ol) kyprms

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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 j1vo8f/hs+ gjrzxy1jn :2ia-:/zlh krevolutions each second. The frequency of th:1xj:san /2lf-jhori1+ g8zhy vjz/ k e $emf$ 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 clqen64(+yyo 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 device tg0clr9w3h - rzhat

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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 sev 60 sbp ra47afm;1aoptdi a(/condary coil contains more loops than the primary coi0oap ;fb/7aa4a sr1vdt(mi6pl 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 loops thann .uzr8/p9wxw the secondary coil thenxz pww /8nur.9 it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power.sws3d4 twrijmp3- 1imjun*e j 4n96y 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 resonanoq(l6mb; ebz0yqgl..z anp- 5t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of .8qwwievrevdh a:*81constant terminal voltage. At tha:h8 vid q wv*.ee8w1re moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecte7 balua:/v 7zpd in series to an ideal battery of constant terminal voltage. 7z :au /bvpa7lAt 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 resistanceg 09ozw m)un 5;hvcl s0y9,ilw 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 isy6/il3 yfqfg:cwuw 8p28oe od0-a 8ol 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 batterv k8d8r ut1-owc-k 7mjy. The time constant for the circuit represents the time requikd8ok1-8 juct7 w-rmvred 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 arebxbtev8pjgdmd:+7; 60d 6jxsp 6z;ca connected in series to a battery. The battery is suddenly removed frm ;dzjxsp:d;bc+ag 68j v6b7pe60 txd om 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 units ex y9*cilwj7 f/6srf /htcept:

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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 Aa uh4+ +.nse6blxdw8 wC 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 circuit, the cus;d sd4a , sft*fk;5sgrrend5d*f;f; tsgs4sa sk ,t

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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 w/syhcif)m+ 3 qhat factor when the frequency is trm )qfi+/h y3scipled?

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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 A +;qv yibyd6 c,c9oi c xa21u/kw:grd1C voltage across an inductor is doubled, the inductive reactance of that in bo;qic2yg9 ucai: 1yrddw/6+vxkc,1 ductor

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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 acr-hqp g.egm6qs 4go6o :oss an inductor approaches zero, the inductive reactance of th. e6g: 4gg6qmho pqs-oat 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 cu5-w) 6 zn2bta 6qn5gff6wnpo:8dgjsk rreng:z)jf8-qg5 npt2nwwk5s66 aobf6nd t

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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 fq (a6u2fy0mxv. hy5 siactor when the frequency 62 ax(ihysq fvy .05umis 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 voltagvf oti(w7v t(yf3+5 xzipxonq,4- tl :e across a capacitor approaches zero, the capacitive reactance of that capnx3 vv fo :w(p7 tyolztiqitf54x,+ -(acitor

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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 tfe7p d7lw ev13he voltages of the inductor and capacitor in a RLC series ewpvd fl7137e 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 defined .n qkvst1f*6 hrbse7d,5bb 4o 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 increabqv +dpwc2c:9ses if R increases. p+ cd bw:9c2vq When is this statement 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 inc*gud*3 ze0lzsreases 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 ci* upgnkxj3 6y/7r byq7rcuit 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 w/qumh+te; 0n the capacitance both double in an LRC series circuit, the resonant frequency of that circ+ 0unt eq/m;whuit 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 tha0rhmo 4*hqsr*0. yy yvw.ycbvu (p5p7t 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 series0dq5v-- : .syxmkakgvlg(, fh RLC 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 unifonfmcve* 2wq (t+ix 5:vrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field veqv+:mx2e ( 5nf ctvwi*ctor 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 0.10zqth 0/ gvwfrso f+0+5lu) 0ol m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planus/gl+5 f 0f0orq 0h+tzow v)le 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 uniform magnetic field of2h5d;jid.0 inur5;vtq ll1as 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field0 huaq;nrj55t. v1d il;2 isld 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 s,a kb7dmc/f8w ,d3dskcj ,qm2xi e .h+ingle 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 cc7 rd2 zs )8onmdp w;wblj;b(1hanges 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 sides 0kzehd p4g0au 1xe +g+18 cm. A uniform magnetic field ish xgeg u41+ezp+ 0dka0 applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15( c3mefe i8av6k. 3gui 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 ar+iv:iom 1:h rrz:rc(y ea $0.20 \; m^{2}$ 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 z y *)z9chk-d:p:ugopspan of 60 m flies horizontally at a location where the downward component of the Eayp: hzc:zgpd9- uk)o *rth'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 baryxynp9a9.l fgx3dbuzf9v.w+) 1uy v/ that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axi/+wu9dy.u 9 n zgxyvlfp)v3b9f1xa y.s 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-h*z belyxp-p8m6 8f;bim 1z0vsectional 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 tmdc6 e- -6rqcw)c qx,turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatu04yc/o6bsg8m( , 2 hssgo d/vehsrt g:re. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what wh,6sogrh (/vtg sydecmb/s820 4so g:ill 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 1 z:q ,zxwzzf* 3o;ru7c00 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 0 zatgjgndkn q1 k.().tp6ut8 to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magne.(dug qnkj8 10.k za)tp6gt tntic 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 mpj20 st w -e-g x3nqt:dfs2y+e5lhtx*aximum $emf$ 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 resistzjidn+-kh8 rih ) e+3iance 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 motor9q)ckod98d1-sbx w un have a resistance of 6.00 W. The motor operates on 120)k d8cnowuq-9 b91xsd V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to by ;ye4f50azrr7 xwuxv 83q+ pa 24-V power supply. The operating pa5x;0v4y 73 8qyebrxf uzr+ wcurrent 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 connected7w/i( zo ur+tay xkv:3 to a 24-V power supply. The operating current is 1.0 A atoi:7xyvtwu +zr (3ak/ full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2nzj2ifi6 f vr*u(,,fm 4-V power supply. The operating current is 1.0r m,f zvjnf(f*i62 u,i 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 re9yw a1 u, rkm8x*b9kxeduce 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 pri7l ukt4 ley;kcz. ;7rnmary of a transformer causes 14 A to flow in the secondary. How many turns a ucr.4;nk;77 ztyelkl re 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 tuevc mi /1p9s 6e m36gq:bebk,he 24-V secondary has 36i1vpb :/ ,mmckue se begq96100 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 ;p( 0ueesw:apwp8sx*,k je28ia 1 nzqyoi*y9 a 500-turn primary coil and a 2000-turn secondary coil. If the current(2;qpp:8aejeo *8n1 iy kp 9iz*e a w,w0yxsus 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 tran1 v22dsjq t0vssformer. Assuming 100% efficiency, how many amps at 24 V can flo1 t2s vd0vjsq2w 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 prov dus 7;lpe jkx(+kd;px:d7c) iides 7500 V at 10.0 mA. The primary coil operates on 120 V. What uexl7i jsd+p;; kdd p(xc)7k:does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tul iuxv +(d.m3arns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in xuvl3iamd +.( 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 coil and 3zfb. u ru kuh m18)-enet1fx2;00 turns on its secondary coil. If 120 V at 2.0 fhkuxe2um 811 un-zr)b tef;.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 has 100 turns and its secondary has 200 turns. i58et24ek*n5b gndvl If the inpvedn4kt* gnleb 552i8ut 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 transex-u y w,hj ;a.ro386jpl yvz3former has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpuue;pjv8y-jry a,6who l3x3z . t 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 h7 6s7uea:kfagrcs:e+7a1yxq as 200 turns. If the power input to the primary + 7a7eka7xr: 6 csauqgf1 :syeis 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ua2lxh m,o /lwz- 9ru5hsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the omahl/h xu 2rwz9l5,- 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 iv-r2(86qjwzng 0qgf.w llll7 s usually stepped up to 4500 V by a transformer and transmitted through a power line of tot8lg.qnlqzwgvj2 l7(06flr w- al resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The d c,4hnp dvdiezy( 98-voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lid48(9 h-e,cdyv ndzpine of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generw0 ld bjs) a /wl3.x:c8a;aapoator produces 100 d0cl)w .jp3awaa xa: 8o;/lsbV 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. 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. A geneabum7wqo5, /xpn dc8 *rator 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 transformeomq *8,wu75pcanbdx /r 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 dod ptm;p,0(sh4s95urx jpr od6sn3qm (bz, :urwn a 6-W line at 1000 V. How much less power would be lost if the power were tsr,pu:5 p4q(mrh sz, 9orb0 d36d(j snutmx ;pransmitted 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 kz,9wh 1 vaw4qk.id* btransmitted on a line with resiwz4,ha k9q .wkv*d1b istance 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. Hony7tdd:kkaxc. .r sg /r4 zt3bo1r-z/w much energy is stored in the coil's m aygc.bkt34 /1z: x. nd/s zd7rr-oktragnetic 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 a k95ljhe/+ kkfn 18-H inductor. What is this59h /jk+lfekk circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage g0uoeyq t4q)rx9t ,n -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 outlet. What is d/ te:,yzezv 6the 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 tnthj 7t.tged 1rk)7dw:j :ks:he resistance of the lamp?t:)7gjhdkts ewnt1 k d.:r 7:j

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplyxvx(*((iz 8yb/wix t;p v fo.-vfa k1m. What is the peak current through thb8(av izmx(f1;wvxx(.* f py vtoi/k -e 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 ac61i3c p( ancvcjrya:2 power supply. What is the power dissipated in the r( cvc3 1jpync2a: ri6aesistor?

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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 resistor .uir9i.lfmp;5 qnq3an a5 )ovzs)x* vis $I = 0.80 \sin (240 t)$. 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 resistorfxmb7(i4v/o q 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 resistohj+ +.uwqag,; 8f.bz b nz.zqeknj/.ur 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 60uhe9 6(n zax7e 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 reactp:k/ 0 coej,h2l*umao ance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-p,b k* 6nei rrio2 (r asj5ef9nxg112lmH 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 sb* dgjqb, d(vyq8gq i vy,1;;157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC a u *rraxa(cct mh96p3/im-t (wt a frequency of 20 kHz is applied ( 63/wrc*it-(h mpucmax 9tarto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourct(2ns+xyk0t -xeb o b8e?

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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 react h;76ldocav/eq9yym 3ance 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 reactan 315 jssix .t8-wbjgs: u:xgedce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 3v6;7smo)c3iw: up yf u: vzrm1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of aw 2;yzcyz+p 7e 0.010-mF capacitor be 100 W?2z+ep z ;yywc7

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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 Hz and 5jyu q2:x475et taefbrt) 4,ma.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance,u,bhnmap: hne9oj-esry5 b1 730kyw: 15.0 W inducuh9bmwnn03 eo :,hj y bp5rse:ak1 -y7tive 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 1 ,mwiu( j3vk4x,*t gma500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coauxjm(vi ,g3 w4m,tk*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 at 1500 Hz if a 100-W resistor, 20-mH coilo(z lum2 3vk vcj8t sjcq,)(,h, and 1.0-mF capacitor are connected in series?3 hlkc o)u8t,j szvv cm(jq,2(

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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 i s e6q625uauzjs connected in series with a 20-mH inductor, what is the impedance at 1000q zej5us2u6 a6 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, 4vy 9n7+o5 qburh*ydvwhat is the phaseu + ynhv4yrb9d*q vo57 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 +(0rtngdu bku9t0c s )with a 20-mH coil and 1.0-mF capacitor for a tgk+u9n )d0(ru b t0cstotal 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 100p-b+p)7nco/zzwo hj 3 -W resistor and 15-mH coil )/ho+p ozbnj p37w-zcto get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in serieny 6md8it2q-+a i smz;s with a 450-mH inductor at 5000 Hz for a total imzynm8 i-d+qi6m2a ; stpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHzn frs q6 b,8kogk;t2ir51p6qn for a total i5 ,bsgi8tkn62orq6nrp q k;1fmpedance 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 connect(e8i*pkh9k/1 c; sk1lnwxd gwsu69p sed in series with a 20-mF capacitor. What is the impedance at 1000 9uip(c/k*sl knx9sgw1s8;h61wepkd 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 seri8l+ 8a3jvv m1 )6s*6zpkfwq n sz(jzides with a 10-mF capacitor at 1.0 kHz for a total im(p f6) 3 szzas68mz kjj v+wniq8*l1vdpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF caagkwdd5sl(93o8 nu. wpacitor at 1.0 kHz for a phase angle of gk9(w 8 uw5 dodsa3n.l$40^{\circ}$?

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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 resistor at 1.0 kHz for a totayy v ;g8um ochrf4s(68l imf(;4 ro y68y8guhvms cpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at fe;1, p:h a*tu8se:yyq sgh 5d120 Hz. What is the phase angle?s p,e*fq y8: ;h yg:ht1dsu5ea

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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 Hzirz(kd -0aweh0 d8 *ak if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriew(8d ah i0eark0z-*dks?

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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 au6rs2 nfry ; bor2-lb8yijg3 :xoe1e / 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cirbrrxj8gy e6:ei /1obyuo23n s l-2r;fcuit?

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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 capacitdk* u(lp;pw;r ive reactance 30 W, and an inductor of inductive reactance 30 W dkpl *ru p(;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 serieswe ryexe8 gzj-wf0:. * RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedergzef0w -ejx8*:. yw 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-W resistor for a phase and;19e, id zzvvgle of ,zd z9;1vdie v$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. 8cfw6q3h.q ar81 *0gy sdh lvx At what frequency should the circuit be driven in order to have maxiv0qxgdf rls8h1.qywa386h* c mum 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 serif,to; rlldua,l7x,.*ik gc u -es circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected tl dkllx u-oi;fa g* cu,r7,t.,o 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 isb9yf)t h.pmnb p*w)1 zq 43kxw $63^{\circ}$. 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 6f fo0n),iaqi fi )t21e0 W and a resistance of 30 W. What is the f,1)q)o0 t2feainfi i 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 circuit containi- ljqntxf2l 4ig7r0zou 9(bb5ng a 50-W resistor, a 10-mF capacitor,9(7bzju4blx o2rli g- 0f 5tnq 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 frequency of a 1.0-mF capacitor and a 1dd 53d,+n-:vtzcl ni q5-mH coil in series?ndd:dz-5+,cit lnq3v

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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 r./s, k9dy8rko f*xtvbesonant frequency of 1o,kvb8.x*yd 9fsk/ tr0 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 seriz u8f8xih o3y9es with a 3.7-mH inductor for a resonant frequency of 1000 Hz8ux fzy9ho8i3 ?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-m29h nlyjz *m8mH coil if the resonant frequency of the circu9zmjy nh8l* 2mit is to be 1000 Hz?

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