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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 magnet7zu: y(tlaq-k dn.6i/ tfmtt9ic 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 tpgop 3z. m1)(bm9rd khhe $emf$ 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 prodop)z -s7:dw6*s rggpbuces what kind of change on the indubgp*z p6:) - rsdowgs7ced $emf$, 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 strengteegd s, 3qnp,)h of the magnetic field through a loop of wire produces what ,eden3sq) pg, kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the indaiz21a-n l k8g71ocs ew3 fd1duced 1wldsa 21k8 d1i-onaf7zecg 3$emf$, 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 magnetitcb5+;f t)05tcao f mjc field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inrbu2 fi3c+u)ujtqw2)6.u mebduced current in a conductor will be thateuq))u+32. i r2wu fcutb6bmj 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 horizontal table. A bar magnet is helj.e0 cyx ,.btxd above its center with its north pole pointing down. The stationary magnet induces.tjc., eyx0x b (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 of9 et (2im fpg;j3gl,y-.zb (4lljyuxn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, ue yj 9ll,. ;xblg2gfiytj(-m3p4 (fzthe falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the njtqiu2f6/cu(8qm8 f magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fifqt82m6cjn /(quiu f 8eld fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magn2 4 w;ejd yzz6s2freb6etic field vector pointber6; e 2zszwj 4y2fd6s straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regionor*kb bsz:2)txf3 ah / 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 coilsx 2aftkz*b3hro ) :b/ 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 carries an evenrzs d,yr0r4 wc4df,* r-increasing current northward. Two coils of wire lie fdr,4r s f4c,y0rz n*wdlat 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 tdqk 7: v-wjilqis +p48loq+j,0 z8f tof wire with the north pole entering first. As the north pole enters the wire,sijqt8j wi+qfz8kd qt-o 7l vl 04p,:+ 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 angu8 gkg du*+m ;,bvwnwr1lar speed about an axis whose dire gdgw+k;mnwv , 1r*u8bction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant3j 121 r;2n/buqo;lb ch jpc vdk)7hw;sf;bjt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poi jl2q;;7kpw2c; vn bj r dhbo);3sbfutjhc1/1nts 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.e2p2 -h zijed(
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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 tha/v, mi;xu .lgbalufiyo;sw7 k3 z-1 y(t 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 field. 4u0 b-mrb mv+l 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-f8 q*nh f,b9qawest direction) is moved northward at constant velocity through a magnetic field fn8bhqaf,9q * 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 b -ocvr5c32w5p3elsuga9 qv3kar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfok+l(7sdg 40wsbtb3n +mu lc3 nrms

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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;9r8naole 4hi0cz3 stc * dnk( each second. The frequency of ta(4 ;*ocds zlcrne3ki8 h09 tnhe $emf$ 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 u 228mr19hw ce8xgioibsed 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 device6a(1:s* jn9whhpvd zn as+o;g ;ji-lj 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 tbbm76q3dt )zk he secondary coil contains more loops than the primary coil ktq z 3db)b6m7then 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 priman 5.n *wrhsg70c pg24yka94wnnzzx/ ory coil contains more loops than the secondary coil then it ixk h5 29z4 n4.yp*gwc/gasr0nnoz7nw s 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 pow9l-yfvg d* 5hger 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 ciunpx5 1qrbu,t)8k x4 rrcuit,

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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 id(e2dwr4 n hw)neal battery of constant terminalw dwn42 nh)er( voltage. At the 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 connected in series to an ideal batterutd++e w3 wq/cy of constant terminal voltage. At the moment contact is made with the batt dt3e+u+ c/qwwery, 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 rewd5pyhkzd-, 7sistance 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 is connected tb))yays0ok n4o 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 batti8 aynj3/;hje.yk 9e wery. The time constant for the circuit represents the time required for the cuhkwa9jn /3e e.8;jyyirrent 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 battepe b96,j+ qp nsum2;agbz8qc2ry. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curren2g pp9ua2qbz+ mn8c6bsq;,ejt 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 hahw8 pip 3+1yq6kh s5zr-5spfeve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circui7ebq pj0 2x*+l p1mnwwt, 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 p 6o:uaw2 ur1fe1ni ah9ower supply. In this circuit, the current9au1rhwa:16oi fu2ne

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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 circu ,wrglx6*m ss4it changes by what factor when the frequency is tripsm 4 ,sxl*6wrgled?

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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 )pw7xo.a8u* a*b3se+rdoom a69 li ikinductor is doubled, the inductive reac mwl ad9)axkp saoeib+3uor* 7.o86 i*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 zerf0z;-;l *vjl phsad7p9:p nu e4i xwxx,0vag)o, the inductive v-*ix a 4s :;x) jzhlwlfn7;xdpv09,g0uae ppreactance 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 supplyi ; -mkoo;x90bq6oekp. In this circuit, the currek ;p 6qm0x ob;e-ko9oint

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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 u(9 +vqfp9i52og. ybb -pkjzzwhen the frequency is(oj.bq+5zf9ipzkvub2 9py-g 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 vpywz 0 ujm4;7boltage across a capacitor approaches zero, the capacitive reactance of y ;p0w74ubzjmthat 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 capacito9w ,(3tc q(5,o rxwcscl awnz6r in a Rn( ,q,cl93a o cxctw6(s5 wrwzLC 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 ci;ya3 d7s fdns)3+s:tmfifes6 a*yj u,rcuit 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 ing ix6,1, muptcc j3x:za/ rpdb4s (xz,creases if R increases. When is this statement tru ,4u /md6 rxbtgp:3i(xz1sp j,cc,z axe?

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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 impeda-b2ky1e 9s xfdnce 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. qeuxijlj/e8 4;2 c b;w 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 in an LRC se 38nh-z jl/edd),p zgfries circuit, the resonant freq dhnl/zj ze3d f),8-gpuency 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 thaf 3g d4yzx)3 pp a(j)+7awvtirt 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 circtppucd*m(/ u0uit 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 uniformq /jdqym4ycm) t.g 3h. magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec c dqtm/y4j.)m.3qghytor 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 orlypolux + vmf /xo(l-g5v4.fi .zsd+.ig7 .magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are xgv(7yisl grl4o. p v .l5ioou ..- fzfm+/dx+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 fiel6d:mss1 ,vgvjqv 7z )jd of 0.20 T. Find the magnetic flux through the loop when the plane of t,s7qv z1gdvmsj:) 6vjhe 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 of an adjustable single loop is rejh.zfi1faj1.w2 1x z +l(pl q rvbio1-duced 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 froz .rqlv, zr565d.zt xcm $4.0 \times 10^{-5} \; Wb$ 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 2j/0 wg-;(2 pmezrs)ewqfzaowith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fie -zp)m fwr ;2qe s(0z/ejowga2ld 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 wlqcjp*ws:vi 8 8j1 ,f6arm9oxith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and b g;qae6w j07n-zvs t-jxdx00area $0.20 \; m^{2}$ 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 horizont -u8ijtd/ 8 pqui,nk9dally at a location where the downward componud8kt/- ,nj diqu 8ip9ent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular v /eismzl9 0-0agcv* u.m2 g/mdwyc3drelocity of 2.0 rade mrg.sm v uw9-0 3a/ccdi0dy/ *ml2zg/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-seczq 2 d.mnqv x:a hg7hm41*:sbvtional 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 14bga5ns4oc m w0yhe 9.n3kd/a00 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 onr1k7/ hm e. b2ps;fizn its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis piz7ms1; 2.fhr knb/ pearallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistsri :.n2g fjb tg9i; +rxgkvt52tk*ze1 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 constru mx f:l5 j;bvve, z2jlmut,z*86dx2ur ct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the arefl6x2r2v x,*dzu mul t,5v :;b8mej zja 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 maximu w2jh)y)m fb;,p4szt xm $emf$ 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 Wy5jof7h(4,gfprx ca0(+ dqn+f z ie3 b. 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 m 1bcq:lq6*mj sotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when rum*qj6bs qc :1lnning 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 6.0l 6(jmb lax-4qs4,fd l W is connected to a 24-V power supply. The operating current is 1.0 -s4 qjmll,4b( 6dlf axA. 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 omen/6m01asm *, 7pdq icjpe:W is connected to a 24-V power supply. Theje6p ms0 p niocmed7, :qa1m/* operating current 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 internal resistance 6.0 W isvvbtihw w j459o6g3h .bob9.im479 rna +brcx connected to a 24-V power supply. The operating current is 1.0 A at full speedw+i .6i9o4cjg4 9bna5r3.xmthw vbv b 9b7rho. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prwf cr0)p4q :ic mzz,0gimary 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 i tml4u35ip gb* di5u2bn the secondary. How many turns are in2ibg5t*b 3 d54u plmiu 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 110r )6m1c; ie6u5uuy-ni j,sqtk -V primary if the 24-V secondar,e mqcu-ik6;16) isy uru jn5ty 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 and a 20002 xj34pmc /x(y-yzr,wws+f yn -turn secondary coil. If the current in the seco+ 34xwy pzx/wrm(c-ynyjf2s ,ndary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming o ic*2 p4u l*.c ovtj1n+*lmgn100% efficiency, how many amps at 24 V can flow in th1gi+*cl2 *oom p4t c*nn j.vule secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V a h:fe*fk7qp7mt 10.0 mA. The p7pkf: h meq7f*rimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns onylr vlqa+rz/v-.gjds6+ 0v8izh 0x8g its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondaryxrg vaz0rdzgi.l j v8 -vyh0s6l+q /+8?

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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 tur3cp d ef.d54iins on its primary coil and 300 turns on its secondary 54ci p dfed3.icoil. If 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 transformefuyrg9:,tgs.ng t)9 sr has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the out s.ng)s9t:,ry9fgg tuput 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 turn;pdot*.c.j brs and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expec *oprbjt;cd. .t the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 t;qxx+7:f2+az s qrwsturns. If the power input to the primary is 100 W, we can exzxr+ qqx;7w as+:s2tfpect 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 ishq uloo.5z 3zni- ny4* 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 tu3zi -qz5ohyn .4ln* uorns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ur.cvsot aip0 4+0rl -ryk+6o msually stepped up to 4500 V by a transformer and transmitted through a powero0v imp.y s+oar0r6cl4kt + -r line of total 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 cuu in7w*ut sa .)f aa28 w45wwclu(8ydvrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power ldn )ys*. 7tl8vau( 5 w8 cwauf2iuaw4wine 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 hasva9 q436paisvq 1nu,u 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 a transformer with a turns ratio of 100:1. What percentage of the3v 1nuqp i6sqa9,4vau 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 rsu-qg ,nrj0uiu l /d38yq/ay4esistance 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 1/la/0q s4-ri3ygqdu,n8 u uyj00:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 Vnci*qjz 6q, /p. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?nzpiq, j/c*6 q

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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 transmittea-4sy,n x(az4nw q9ixd on a line with resistance of 0.60 W. To what voltage m( sxiaq9- 4z ynanxw4,ust 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 n xt)be 6u9 1z55bqitp5.0 A. How much energy is stored in the coil's magneti 69t1bbqpnx ue 5zi)t5c field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductors6/: :ed1g4hunth xb1 xlvlv0. What is this circuit's time coutdh 1b6ex:/lv:lx1g0hn sv 4nstant?

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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 i4 6 3*bmyhp v2a7arzmcircuit 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:b4 4(a0vp9tx sj4cpsdhxfx ) -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 resistancez6 ik n9ovcq26dq*6hzit:6q2iwvf y; of the lamt6khq z qcdo*wii66:qzv 2 f vni6;y92p?

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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 cong3u0f*g/n2 go;7 oo+kmq grdonected to a 120-V ac power supply. What is the peak current through the r2ogm/0;u+7*gfqoo3okg ngd 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 o d.o(;ns6jnvmy( wakrd7 4)ma 120-V ac power supply. What is the power dissipateav 4.nd(nwm7 do(r6jksy)mo;d 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- qhtu tp,dad2jf/-2 i3W 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 resistor i;lw tcszxa0x w fqk7n06y0;: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-Wqrwm es*z9v ,)fh) jbt+o5ks3 resistor 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 reactanc.4zg9uq6q ,nw pxr9gcv0n.c we of a 1.0-mH inductor 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 o1l 6lo)m68 zyphiyb q2f 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 1g r0nu:8; k4ubdur fr34.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inxb*ru)q4rg d-ductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of(c b /tzfbn2(gf,u )i1 ov/cms 20 kHz is applieg(2o buvf ,c) (nbm1//iz sctfd 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 tbtms7 l0-iv3through a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor 9mir -qozdurms-: 53d 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 3e7g.n:)blv:o ;enbinj9 ryu 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 capacitor have a reactance oredx+ey 971o1 6jdcb df 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0,z5fb wv8g802gp7g i8mas dw d.010-mF capacitor be 100 W 8gb7 i5,0gmdgpvzwd2fs8 w8a?

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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 5.0ho-cor kc1k5 4 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 j39a-jufe k33j3lvytv4 +eg swith 12.0 W resistance, 15.0 W inductive reactance, and 10.09u- v jljvtg3jyf 3ak43es3e + 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 Huq4bd)k0zo/tw qq/ 5x*iw1 ;g ik3d qseo5 hd3z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitok 5*td/qgb qw3s0o 4widi uqe;o)d5h/xz 1k3 qr are connected 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 1o fe rpxd+s2 q4o6vml: kw,9+d(iuet800-W resistor, 20-mH coil, and 1.0-mF cao+: ki+w(r,98pmedtdx6s e lvquo4 f2pacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductorik vl*z 18jpyxja-q5j,g3a (t, what is the impedataqk,*a (3 l-xi j1p5 yjjvgz8nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inducto nycb tty:.0yr4x vaddc-8i8 /qv* )dyr, what is the phase angle atqb*cddyc/ 8yitn0.vr d) 4 :yxat-v8y 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 with a 20-mH coil and 1.0-mF capacmk)j1s k zpgk2r+hz27itor for a total impedancep2zr h)s21+gk7mkkzj 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 fm1 7u7aom + q;aw0 s*aejiff2needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000+fia awmufe*m;77saf120 j qo 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 at 50q;2lp wcz;.np00 Hz for a total impedanp;cwznp . 2;qlce 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 withk 2a -p)roqgb* a 100-kW resistor at 1.0-MHz for a total impedance of 1 2-* okagrbp)q50 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 se6ms(: ejtws/h ries with a 20-mF capacitor. What is the impedance at h6 j/metw:(ss1000 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 pf)svzy9)u0z capacitor at 1.0 kHz for a total impedance oz) 0fszvyp u)9f 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 capacitor at 1.0 kHz fork(8e ;qb5-xpqjwks t 0s3 y0xbl0nr+x a phase angle of x +8jr3x t ;k05k s0q(s0x- bbnypwqel$40^{\circ}$?

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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 inwn2vp 6*y9b+zqf)a brjo .,lx series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?zjra. bb+)q*wypl9on,f x6v2

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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 1 jc4xqc)rsk q a;cri2:zq7 pe+un1h5(20 Hz. What is the phase angle?rkcac)ieq(su47q j pq;cx1n5: h2 zr+

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil;m9r*v l atg5ou +iqoi5k9c) n, and 1.0-mF gaov9;c r5 +5q9nku im)*oi ltcapacitor 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:xp( tht/f6x2fq at7oz:4 xc f resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connectetqoxzf 6(xt/ ac hpx:2t4f:7fd to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitiv1mgi.p tg zrluz 07q;*e reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz *gr i 10tpumgq7. ;lzzpower 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 ayn54s hrobl3eo4 q :sn w,w2/series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H 3bsh w/,4sao ro e4qlwn y52:ninductor, 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 with a 500-W resistor for a phase angl i*sxvd3mi;gap )+n r+e o p+ g;+ms air3i*v)nxdf $40^{\circ}$ 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 = 20.04o)f1cc lx4sl b5 w/y*f lvy0d W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fromlybs)0cl4/4xy *w ffd lov51c 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 (ou9;hknn 8m3 w /dzqg8.ank,xz(tlawith 12.0 W resistance, 15.0 W inductive reactance, and 10.08,wg8 (9aqzxhz ;/ua.lknmtd n(n3 ko 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 AC circui1azj h5elcw.. t 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 hasbjyu wnd)kv1 3dbhxu- b(:/) k an impedance of 60 W and a resistance of 30 W. What is theux-bnw:k/bhdjvu 3k1d() )yb 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 ser*hy61 on6nm y1x -w jb,p)i8zvcr3gi)va+ywxies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pw g+h) 1ay)ijin,p6n8 v yyc*3bx-wz6xvr1om ower 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 amvp/nntd n0 *;slg/l 4 /hhb7n 15-mH coil in series?gd hs 7n*//ln np0;4thlvm/bn

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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;lf6jplmi gai- *e,o- a 4.7-mF capacitor for a resonant frequency;j,6iplom i f -ag*-el 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 inductor for g.92ur zo.u x 15aqxvba resonant frequency of b9 .a.vo1r z2quux gx51000 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 inis7qmd6 dx/b9 series with a 30-W resistor and a 40-mH coil if the reson 6bxdq9md 7si/ant frequency of the circuit is to be 1000 Hz?

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