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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 unrhw sf05 m+* p2z8ybfrits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states q:nwb2/tw0 b tthat 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 li 8yil;h qw-3boops of wire in a coil produces what kind of change on the inducewlhiqiy b38- ;d $emf$, 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 throuf cbd1qh5v +gnj.jyt5 *;ffwov+b+1 v gh a loop of wire produces what kind of changev .fgw fbt1j+51bc+vqj +v*5n;dfoy h 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 ind a;cs 2j53gfyjucedf j ;sag23c5yj $emf$, 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 6,os3g4 l6ujpmoy:d - ezed w:from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of afnd5n q/et9xyi riyjq 8p9(h)1 ;-hl an induced current in a conductor will be that w/ qp8j qhaetliyyrh)(59 dfx;i -n91 nhich 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 m tal44 egn5zdipqlqg 2p4402a horizontal table. A bar magnet is held above its centn 02a4q le4ptdlqp g4m2i4g z5er with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablee vt1;kwy.gi4 1-4asdvdbh)g tz,f4 f. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fr fw szd41-,dgg.hvv;fb a)kt1ey t4 4iom 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 whe;a xh p6lram g9slw0r :*5yr1jre the magnetic field vector points straight up. The magnetic field vanishes sud:mr *h95g; p x6a y0rllw1rsjadenly. 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 tabloqh-*liaf k/ aeo/x; .,blxo . 5q5ft2w9svxfe top in a region where the magnetic field vector points straight up. The magnetic field suddenly grf * x,;/.2h5xlo/wqol k q svfbit-a9e.x 5oafows 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 region where the ma06**nhl jkgvmgnetic field points straight down. The magnetic field disappears suddenly. When viewg*l hn6jmk 0v*ed 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 al0q1fn2qr),l mgx/ f a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tabg)fq l/1,n0q xla 2mrfle, 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 s:-x 1zm6ubhd),9 to ucro 5xlpole entering first. As the north pole enters the wire, the induced curren xxmoz-1scuho6ur: )t 9dbl5,t 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 who0knz4hk/qn q74 1k -n /b(j+xuoz cllrse direction can be varied. In a region where a uniform magnetic field points straight down, what must be n( 0 ukb k4jlcrq4 l/z7on+nq1/ -xhkzthe 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 rotated9kwe x1tgiz sd 1;l.3u at constant angular speed about an axis whose direction can be varied. In a tsw;dz1.eilku9g3 x1 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 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.c3,7e d4mprx f
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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 r aqo/4e; )/rpm prr0uthat 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 magn c e,f(4pr4 -)logajfuetic 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 direcp g :adxg(:q)qtion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced ad:a( g qgxp:)qcross 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 velociu*hf3) um+dc7z6teeq ma d(*jty $\omega$ 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 .akmjxz;kyzi:. w6 ec4z kt70rms

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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 throughwu1 q44p 2qhger;a( xc 60 revolutions each second. The frequency of t2prh4gwqc4 ; e1uaq (xhe $emf$ 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 deviqc83+lyanf 3 vv z,dix,*vry74c wqw ,5pbsk(ce 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 thk75knhg:2:+2i+afp zp ymyo oat

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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 second)v7rtc5ip 5dlh;yst,obm7m3f9n-b sary coil contains more loops than the primary coil then it is atdo3t 7rm)c p7,fmi-vss h l9bnyb5;5

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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 mor).gd;; ddvev*gb 6qoe 4 3qvvrb:+/.fqa mypxe loops than the secondary coil then it isb. gdyqv+p d: va;goqfbm./q 3evxe4v)r6;*d 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 in6ty4oyn+ ok j+r3-lddput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit, xt0y,gqyc;a7j9b u1o

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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 t5 m2l.qnui: lso an ideal battery of constant terminal voltage. At the momenn:2l 5 iqu.mlst 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 conneb;/mrj why 3;-frab i3cted in series to an ideal battery of constant terminal voltag-r y r wmb/ja3h3;;bfie. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is c7birba-,k ut8 onnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 witpw q4upd:d5 w;js y6j3h inductance 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 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 inductl 4 vtq:9p*xysor are connected in series to a battery. The time constant for the circuitqtv:9ysl *p4 x represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bath:jziwd0f 88n tery. The battery is suddenly removed from fj :8dih8w0z nthe 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 unijog rsqrh/8djvyj4)c1 b+7 c .ts 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, tboo1w00 p6pyh 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 col wtg cs:;kj3hw (c uiw dqow.7c-6)4bnnected to an AC power supply. In this circuit, the curren;jwsww. bc q(h)l34 : -tu wgd6ck7ocit

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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 facte 1kj8+ legisu39svg jvj1c03or when the frequency is tripled? j eulg09k13iveg j+s1v jc38s

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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 v i7edxug1ya7g06wqf70f(ke 7g twi 9 across an inductor is doubled, the inductive ru iyga7709(ke6g wi w70qdtexfvg f 71eactance 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 zeroz lk:.0 yahbt9, the inductive reactance of thath zlk:tb09a. y 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 supupq5( l(1kmqd7rcjug j *3 qa:ply. In this circuit, the currentqcgj :ud ql1j 57m(3*raqkp(u

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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 whephy(42s t ii0sn the frequency is tri4ph0(t ssi2yipled?

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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 approaches zero, ar1 i -joxt.a/the capacitive reactan-t ar1/o a.ijxce 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 betjce.tzd*zj:s s6 f*iw,b .it1 ween the voltages of the inductor and capacitor in a zisw.:*bf ,itsd j*zj c6. 1teRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is 1;sx/k5 sznqi 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 increasesqf325vvc(t ag if R increases. When a 5(gct q32vvfis 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 circu:cqaois+ x-71 hmw: sgit. The impedance 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 increases if :*-v4:opr 2sqlfqc vu $X_C$ 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 capacipy 0,a3(ej -g8orlkcy tance both double in an LRC series circuit, the resonant freqgy k0co3py jear-(,l8uency 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 driven by an AC app4mt6lm u orw10lied 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 R0cdcxnc. rkb46 cl x1,LC 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 aq:xrkdwr g 4,3ab9 (rdfx7 x1b uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopq 17 fbwrd 43xx(arxb, :rdg9k 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 mk1:95idt kf 6n3 gt,vi:2vdzpst g h/d is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loh/zi9gvfk6dg vt sk t :,tn25d:1pi3dop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic i9eawoq nu k72n vc631field of 0.20 T. Find the magnetic flux through the loop when the plane n3 6nqvuc2aie 7ok 9w1of the 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 eq9l 2k ubs*qza )9x+dsingle 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 fromj l visz s.m0z4b(u79x $4.0 \times 10^{-5} \; Wb$ 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 si/2*y)apl z w.mviywatbf4f) ;des 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the indb )lmzv/p .fw;y*)f a4t2wyaiuced $emf$.

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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 wite cgk4hun)d 7i7 tw5o1h 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 areai 6 i3d:zd5x/(i)lq, az uojpu $0.20 \; m^{2}$ 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 ae:0kh jhvca92t a location where the downward component of the Earth's magnetic f:90hc vea2jkhield 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 2fcs:*+ok:v. am9odhzf4lgua constant angular velocity of 2.0 rad/s about a vertical axis through one oho.+l2dozk* sav m94 uff ::gcf 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 l 1.d,rz dbe(dgoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire; l+stuz l*rf8 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 lous43-8nn5n+ e qkhn e z(i(qhfops on its armature. Each loop is 12 cm long and 8 cm wide. The armatur- hs8z(+nhnue3f k4nq 5qie(ne 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 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 consia cse)6l+ bw,.ihn9 pdsts 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 construct a simple AC generator with an output o2z0:wf/nk:fb )e ojni fe4o a2ys:en1 f 12 V maximum when rotated at 60 Hznb/naf)2 w 0 2kon sieee:4yz 1fjof::. 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 generator with a maximumnl5 jm za3kiw6,pxi (q3 j82xmj l-,u awyk2:v $emf$ 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 h0yl r23g8sobdg,r 0cresistance 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 resislpe r:j:j;(q d,3eovp tance of 6.00 W. The motor operates on 120 V AC, and when running at fud(3jp,;l rj eq::vpoell speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2)tdo /f q9lso(4-V power supply. The operating current is 1.0 A. o 9s/qf(t dlo)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 (qft81tq ;1j*dq0(ie sajc9 gfvh m7xresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back ic7 ;(qgtjs majxehq191 * f0ftdq(v8 $emf$ 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 Wx6 n q*o/en*d /nwr:yf is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What *d/ y6nre/*fxnwo n q:is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltlbg.0-faq4r3hz, n z2thqct8 age 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 prima drb1uvxk(c-9 fc s;pur ea(7.ry of a transformer causes 14 A to flow in the seconda.ercb (dpf r7-;9xucusk1va(ry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V sie*)l8oszd0cn39rqrrkt)dui e ;k9 .econdary has 100 0)tk9.ic ez)dn*lqi9r3ro;e8d s r ukturns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn second nym niui;pbvp, r ,cd:l2--x8ary coil. If the current in the secondary is 3.0 A, d2 ,liucx-:ivp8rnpm ,; b-ynwhat 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 transf; v wx)l2ymo(q k,9kxtormer. Assuming 100% efficiency, how mqyt;, k(mwvlk) x2 o9xany 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 transformfl7ff2lit )z- j7; mxph:e h+aer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drhht l2;-lpjxe7)z faff i: +7maw?

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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 5 zenr b s8(7lthl*mut9z0g +pon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is8 b5* h 9z+eu(rlzn7tl 0sgmpt applied 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 coi8 6+rpbfbqa6 ql and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sefprq bb6aq6+8condary?

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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 secondar2ns8o vl//oy:yxo wi:y has 200 turns. If the input currenti 2vwo/:x nlyo 8y:/os 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 secondary has 200 cl82 jdtwla-4 -f tx+lturns. If the input voltage to the primary is 100 V,l4-f8j t lct+ l2w-adx 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 q 5s-la wwsgaz94g*p5 dj3qv+and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)slz4ag53*5qdv +-w s9pw qjga

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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 usually stepped ur hzumev 77*5yqge/- lp to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number ofh7gm r5 evu 7qzl*e-/y 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. Themte7o 7n:i gz- voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission l-go7z7in:t emine.

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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 of3+0w*ddy3znndg3d6i m/7 mhvy eju -z current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is 7mzny-d3w hdd/63um e n+*j0dvy3 igz 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;vrwvr+ 3lo :fqrj(p + 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 w r(v j+q:;fpro3vlw+ rith 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 f:*n eqfxe3oneae7h- mp,8 6 ha 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 e 8x*mpehenh,63:eof qn f a-7stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line4 nd7t *( (u pwqds2sjaxr6jj1 at 1000 V. How much less power would be lost if 1t64rd s aj2qj7 x* dn((pjsuwthe power 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 44ior/po cv(+jyk+ n i8/0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator outior+ j/cyni 8v p(o/+kput 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 a5lyd b0.nq (f7s,a;sh e(gr p 9l7pmiw current of 5.0 A. How much energy is stored in the coil's magnetic field?f m0 n5b,sl7p( rpg e7yd; lw9iqsha(.

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Wno,dekxavirvt+0a q(e;3 ju-4-l x v8hat is thisv i-r;lx3va4e 0 exqk t+a(nu,vjo8d- 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 v;i3;jwm(kaadod6fz9e e s*gyocz6 nx8:,h8 qoltage 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 outm :f: 5m q8-atpwseh6slet. 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 ou y5 gzp2o;au qc 5l5 +fcqk6)fsx5gig8tlet. What is the resistance of the lagqff8upi ;q2oxykag56 5zcc)5 5 gsl+mp?

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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 powed2 9dm ttfr*e7r supply. What is the peak current tt 9t d2rd7e*mfhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supns)lz b-:x; cuply. What is the power dissipated in the resistbusz; nx :)-lcor?

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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 rexzu / 2(tziz9lsistor 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- f-:kjbr l 1wmpl0*zc9W resistor 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 ma2+c +e ; (gs88i+hdjyg xp;clui6xna 50-W 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 reactancewat+ yhgv+-3 z 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 nj,aif88 jvoyc 8v2b.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.z3 u7if 8wqq9vi. efnqz3:/ lh0-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 hbjv - (syj4r1.3islq 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 0g /t4i jw-kxzdp+-*nz:lg tsinductor when 120 V AC at a frequency of 20 kHz is aid px+w0* g :-4ltznkjs-gt/z pplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due n.hgggbf2*1 ;x e: ovd/w geu)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 cmb;u tswm m85+apacitor 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 toe2deh: +2l/4 hbukw:ju hp jw) have 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 capacitor have a reactance of;)v tibo 7 z4 52z/z 7ephz+2cpo ej/jylkbuv7 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 0.010-mF cap*:v15xj z mtskacitor be 100 W?:j x 1zs*m5ktv

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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 tyh 2wu24 mz peq*ka4n 0-qzwx,hrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resirqne6gj 06q;5uv d4wdstance, 15.0 W inductive reactance, and 10.;4d n 0jdq6gevu 5q6rw0 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,k.r20hm +ebjkn6*y u rluwv0wjqu4/2 20-mH coil, and 1.0-mF capacitor are connected in serieb2 e*j/lrkuh 0.uku46yn+q0jw r 2mwv s?

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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 resi u:gdwe f+aw(6- ui /fni e+6e; (fwbxp2d:ecustor, 20-mH coil, and 1.0-mF capacitor are connected in serie(ne;gw6:+6wfw:fb-u /fd+axu pdce u 2 i (iees?

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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 2w) v)4 daqhx4lw*b 1 j6-gkfqw0-mH inductor, what is the impedance atwqgh v *qax w b6k4)jw)41-dlf 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 inductor, what is thei7(za( vqx p,y7e1vi b phase angle qyz1(7iie pxb,v7 a(vat 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 capacd16 rswsrgq:*+0s kga,d 4v )apmj x+jitor for a ta6w +,r+)jgds k0m gjs1x *sdpa4v q:rotal 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 capacitamta0v.9w bi4ll;a .nsbd,t hy fe)9,oqfpz ./nces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz? .sln.oaw 0) hmat9t;z/i4 ye,.b pqd,lf fvb9

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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 450l p/wrm5o u 8ywr5tp(--mH inductor at 5000 Hz for a total impedance of 40rw8 lt r/5p (my5w-pou000 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-kzn0 xzkv l 6l)qbn4n25W resistor at 1.0-MHz for a total impedance of xknz 60vnl5 4l nz)2bq150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor.;8xd m:*;y 8ny wik emurx0uq)jfs z.: What is the impedance at 1000 Hzdm:m 8ki .sxzer ;:j8f *q;xwnuyy)u0?

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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 u a0jh s 69/qtosy8ipd7ms /1e1.0 kHz for a total impu9 j6sim7htqe o ad/1p0ssy8/edance 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 capacitory +rf*+c n.hkhgs :l*wbd p.0o at 1.0 kHz for a phase anglekh .chy:fb0dn spo+r.w+l**g of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee-l1 )u 92i/sdeosi j:*uwn1y9ehcfrdded in series with a 30-W resistor at 1.0 kHz for a total impedance o/ jrwuucfsni: 1el)h*1-9 de9osyid 2f 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 ina04y-j *ef tn(se3nkcd.5och series with a 100-mF capacitor at 120 Hz. What is the phaes5c(c 3ay-f4h0o ndkj*.et n se 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 h3+; vpxn ep1vu6hi .aHz if a 100-W resistor, 20-mH coil, and 1.0-mF cah upv; nixvp.ha631e+pacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capaci mimyzlsl u8495a;muv/,zg1xm4 nbx *tor, 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 ci1x zl95invl4 xym z4buugmma* 8; /ms,rcuit?

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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 reactan aa z1)1ilhyh(ce 30 W, and an inductor of inductive h( 1iya1zh a)lreactance 30 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 series RLC circuit containin(n-)xrr3l ;(1iqbg c jtsz*vbg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl-n zclirj)qxt*r( b1s (3vgb;y?

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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 w/r 5lilz. n-fbfz 3nd4ith a 500-W resistor for a phase angle of ifr.zn/5- bfzd lln34$40^{\circ}$ 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 = 2*3yenbp4p qs y7vv + mc,vn36n00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have y*yvsve6nmc7v, bn4p3 n+ 3qpmaximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 158;mh.ost 1 t2ujks n)de65avh.0 W inductive reactance, and 10.0 W capacitivn2 ma;8 tv1 d)he.56hujtkoss e 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 circuzk /qtr5fs :ed18 zmwtj0e70pit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 3a uqj.kt3t*c j2go - ac5nt9c10 W. What is the power*nj5au.c c32agk9tto -j1q t c 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 forovr55) *im 6rgmt4sohqt*k1y a series RLC circuit containing a 50-W resistor, a 1ki r 4*5t1smhvrt*6moqgy 5o) 0-mF capacitor, 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 15-mH codzyupvv)v m284 k4snfvf,.a( il in series?2,8fvf)m4kzv nauv vp y( ds.4

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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 serq; qjvbfdw8c 6*jl i.19.jpfvies with a 4.7-mF capacitor for a resonant frequency o8jw.vf dpj.l f9; i1q*vc bq6jf 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 formcnlq ,)k.4pn4wfn e, a resonant frequen,4q,ncw.n m) fl4 kpnecy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistorn;*y h, am :doi7int0zr96knr and a 40-mH coil if the resonant frequency of the czd0 y9n,ir7km:oria n; 6tnh*ircuit is to be 1000 Hz?

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