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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 magnetic flux exceptdoyl+: g:f i-t8:;nkc/ nvust

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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 statsqt;irt7ea; jh2+tf 8es 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 o)q n(7m-naf(f)aic zv zo. 8lrf loops of wire in a coil produces what kind of change on the in(fqfnz 7v .anlzocia)- r( 8m)duced $emf$, 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 whaey9:hdrq )lajlq ,0l6,wu3fhor3z4 b t kind of change on the l,4,3eh )3luzlbqj6ryqwr 0d 9f:a hoinduced $emf$, 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 changqyk0t-f(+w* anh rku -e on the induced wt -uqkk+ h-ry(f*n0a $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiele m0ojfr4+(qxd an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductob0y uj c7 mjk548v0iwfr will be that which tends to produce which of the following effec8 0 57myi4cf 0jjwuvbkts?

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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 tab+ nwie;jo 8bp0le. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from0jno e b;wpi8+ 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 67izn fi qhp(;is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducq 6;(nfipih7zes (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 magnetic sfin+- mqz khk w9p5zh-4oz+: 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 thhf++pmk zn--s95k4wzo zi h q:e 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 t +w nceknki-a4 ljefg-+4,r3numk ;c1he magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whne-,kmj;gc in4a 1f+eln3c+k r wku-4 en 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 ifjke025ilvh(fkp og. 5c ;2stop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abipkec5k2h 5v s;jlf o0(f2ig.ove, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tabnvdz9fs bvy1 p0 4pb8ecj*)r8le and carries an ever-increasing current northward. Two coils oc p8 89e* n40z)rjbsbvv yf1pdf wire 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 enteratv4.: yr ko-hs24 wymb+hd09xi x.ecing first. Aw4hx-cmhi xy2k+r94y.: e t adv0.obss the 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 co3 n)f2d8 q(nhv-uv;baf2 ubp hzt 8yg;nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the )3zt(v8n8dn vfqb-hpuu g2f2y ; hb a;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 angula/g )wcya+zw 6br speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the w)yza+c/g w6borientation 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.mqh:- x(l .5bqkrke7 x69dzxx +h vou5
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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 tp/+jj rpbg8y, hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The 5y1 gjt5wm rpja*/-5 dkbfzsu9co8c - $emf$ 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-hz3lbm/k0swgh q 1 fa23/(fqkwest direction) is moved northward at constant velocity through a magnetic field that poi s3wf1 3mkhq(h2/fgaz 0lbq/ knts 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 angular velocity qdak;nvy 7b :avq*ou-n2 )ua+ $\omega$ 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 ju- rze(ju*p+ ,6radurms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of 0 7:c8+tnd1j:rddb6zkqcxnnl +5 h a bthe6xjdl b+1n +8ndhrc qba c5:k0n:ztd7 $emf$ 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 devicv u 2gfz62h) vc9cnz,le 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 t:y8dn;i6 fxe-cyuqhi 9+ 2d jchat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than thewuh0uhv t6))c2l1sdu primary coil then cdu wutslv021u6hh))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 than the sm v(2do n;7qno/u ft. hx94yvmecondary coil then 7. mqv/nm 4ox2y(;fv n9ohu dtit 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 powe05a0qe +*w dzili q* mwxrdzg2gl33 4dr 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 h,: p5l64mvi mgh3 ,f7myeeqm 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 f,f)asmt ,e8i to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resis,i 8sfm,atf )etor 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 battery of9x;usogdm tk:-t.n h/ constant terminal voltag s. gt/; hkto9mxdnu-:e. 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 conz+o* )+x*qgc l9log zynected 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 Lpvet7 lf29h 4m and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. q ii)cnii6 v7dc 07dr* The time constant for the circd 0iinvc67id i)c7 *rquit 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 induc/ r-m k0ol*fubtor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fobrou/l-k 0m f*r 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 exc 8mq*bh*o9mn ,9 dr6dxc vfod8ept:

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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 ci1e4 v1pfl4azsrcuit, 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 thiseb8 8;9pvhql w circuit, the current b8hpl e9vwq;8

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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 rz3(zl e4 8 gt-y.yifbcircuit changes by what factor when the frequen(bey8fig4ltzy3- . rzcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acr .ui;j iwg-wx :eahm89izhy 3ora8870zo vg:boss an inductor is doubled, the inductive reactance of that in8iu8 y 7 j3hgr-ie8ai.ahb;vw0omow::z9 g zxductor

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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 cyuz3--k6u nsk yu;-i,l byr8zero, the inductive reactance oku,- 6u 3iz;r nc-8ys-buyyklf that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this ol4yk 0xz4 h9g8qkl0b circuit, the curren4xh lqg b984okl0kz0 yt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanckhbkez.8 z :/gy1kftvbe0p -8e in an ac circuit changes by what factor when the frequencg kk :y-zht10p f88.vbe/bkezy is 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 volo (6xbbh c5s3v( q*atwi z)uq8tage across a capacitor approaches zero, the capacitive reactance of that 6 (xvws a hq(b)*it5qc8bzou3capacitor

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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 anglbh-.mj(rm+aexf*d fo9 2fn 8j e between the voltages of the inductor and capacitor in a RLC series circuitfj*e9 bm(-8jfhrm+o dx.f2na ?

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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 defpjxfxd3;6vg +vfj;2xh /w9.(gk dpvoined 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 increases if zth/,ht; oh0jR increases. When is this statement thho 0ttz;h j/,rue?

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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 circu 2ge7u1tasz o6it 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.iyaw-- 78nc*u*ll b.q0h k .df:zwa se 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 capacita+jdhua7wp r -e:l0 q0dnce both double in an LRC series circuit, the resonantqde:07 dhw-uap+jl0r frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that i1c , fs4vncmw)4;qoba k* hp4vs 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 circu-hi 9at7voz.j c o.0guit 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 r*ksy*jrty3ko /h72jv adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find th t v2*j7yr/kkhs j*o3ye magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotk:vf2 ye+yfa--gwdp9c ,(in)xy 8cf+sc : iicating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo sf2ai-e ,)p y-ycdcvn:fc++f9 kxgc w(i:yi8p 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 uniforqa8(y047b rdfo z0)g yyd/htvm magnetic field of 0.20 T. Find the magnetic flux through the lo /(t0 vqbr0 a7df)gyyzo4dyh8 op when the plane of 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 single lcwvs (-y skou wrkym5pt1zs ;)-sd- /(oop 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 /uc/8k)9cgx nd+ ko ggfrom $4.0 \times 10^{-5} \; Wb$ 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 squs j(lxxg f;ade )cx(r6u n;g,)are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniforg x,6f;sc(a(g )rjx;dulx)e n mly 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 turns and an area 2*c(biz 1us t2ozzb/eof $0.40 \; m^{2}$ 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 anf 5/yqg98bk gtd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 6to5gm0h8 uv4 r0 m flies horizontally at a location where the downward component of the Earth's magnetic field 0o4v8u5rg h tmis $6.0 \times 10^{-5} \; T$. 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 lo1riuqhvm+w+6v5 ,tihng rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through onqrwuih+i1v,6+t5 v mhe 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 aqg) )p0hmy4 zt 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 om9 yti; dtltkd:g vs9-hi+5 x*f area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each e2g3fytiaa3 3 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 magnetictefg i3y3a23 a 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 consi+hikl;guu vps(9lw/ *wnmjv ;)r9js+sts 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 w,y u3.x/nbln vbmtvll3*j d +;ith an output of 12 V maximum when rotated at 60 Hz. A magx3nb b*/+;. ldul y,ltj3mvvn netic 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 maquy2,zu zu dyfxn/ .0(ximum $emf$ 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 m 2kmlu+*15l am(s +gs hw.dxjmotor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor f5b0q5rko*d2,qgmh uj s:js*operates on 120 V AC, and when running aq5 f0b2djju*rg*sh5,q m sok:t full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplyzlud x- x:5 7d:n+*g.vhuvuqi8def0o . The operating curr gvo-eu8 :udfn7xddh.q 05lz:uix+ v*ent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power ,/5wv(3z: aqez -)zj jslwyzhhrc, 3 ysupply. The operating current is 1.0 A a zcvy/j z3l- q:ej) zr hw,yzaw,3s5(ht 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 conn+c.wti wx5 mp4ected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the backwxcpw+i. 5tm4 $emf$ 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 p * h6k:d8 kt5z i3tqa0fj-frkjrimary 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 awp*l2oq u v(0k pcx.4q transformer causes 14 A to flow in the secondary. How many turns are in the secondary?*qxlu( 2k pcv4wp0oq .

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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 wkyevp40 w01lif the 24-V secondary has 1001w040ewvlpy k turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cz5pkg 0iv +5 (1y 2dylovhcon3oil. If the current in the secondary is 3.0 A, what is the current5pzo+2d l 3go1nc5yv hkyiv (0 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 primarqwu( o i-:7v+: /hwz7xnzpj wc3(honvy of a transformer. Assuming 100% efficiency, how many amps +v q /hzw7- ounwiho ::7(3n jxvczwp(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 transf a*s(en+ra s6oormer provides 7500 V at 10.0 mA. The primary coil ope+ (*nores 6asarates 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 soop4ti;x ; hzd-wxon-(,hm 7has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl7(shod4nzio-h ; -;mxxpw ,toied 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 hv.4v 1vdui*jsjm 4 xa:as 60 turns on its primary coil 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 sexv1vivda j:.jm4su* 4 condary?

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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. njjxzr( 6ingt0hia(n:5( g 2hIf the input current at the primary is 100 A, we can expectg z6ihnaj0( h5(rtj x:n2gin( 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 100f31xu:;kde:bg tqj-wp6nsn 5z; 3d* n fm1hyv turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage ofjqx16z3g nf:f;*:t3dywhkum1b edn sv5 p n ;- 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/d c3fyz ,+:fbkayoor;n: :1zr:h giz its secondary has 200 turns. If the power io1zff ,kbn:3: i :rozrgy y/azd+:;chnput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuall46t9 :bf)o07 pv+ cjsuyz iyaby stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 94ui0oy yz+6 j:pf7bs v)cbta 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 usually stepped u,5nq gb3 82hho2 ev*deh+tyhep to 4500 V by a transformer and tb*23htehh+ 2 5qov hyneg,e8dransmitted through a power 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 producescwc+zkh aw+cr2u 9han,:8f) y 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost ukhzh wacf) +,+ay nc:cw8 9r2in 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 v .r(np7h ic.sline 50 km long has 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 the original energy would be lost if the tra( p.7r.cihv snnsformer 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. y0j9 dzlm/kc+os5p0iew nne+c 7dd 71A generator produces 100 V at 70 Ap+ mye ki9j075nsc0newz7+d/1 d lcdo. 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 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 V. How much less poon7qv- 0js, l*.cm wvmwer would be lost if the power were transmitted atvm s*lv- .wq7cnm,0o j 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 affj5.ec yxz.- r4x 7kgt 20 A. It is to be transmitted on a line with resistance 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?7 fk. .5zcf4exygx-jr

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muxvb:x ,vgf*2ach energy is stored in the coil2,xabf :*g vvx's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is nsyy2 kygu 9a.va 9qi:a.j l1 c9u)f:ethis circuit's ti:luu9 21y cvsjqfa:9..nky ) iegaa 9yme 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 is 120i jj:nly(h:kj 9ixacijj: :68 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 (eayh6qlwz 1 f p96kp(a+gsy.-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 at+jif 8cu au:.ol ,(th 120-V AC outlet. What is the resistance of the lamp+ucft i,j :al8u(.o ht?

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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 subk*cdiw w0d1 8pply. What is the peak current through the r8kb w*10 dicwdesistor?

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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 ow73fqjwf; s3power supply. What is the power dissipated in thq 3w;wffs 37oje resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is2 d dsec+ fwg xhl0e7tb7;*g8f $I = 0.80 \sin (240 t)$. 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 a5mb x95d 0qdim 50-W 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 a 50-W resistor 8gqk0pml g: ntsu/-n )qo1djwhgu2 8* 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 , 3vy0t2 lc t.ugc7uaax*mgtdgdc(2c)ti6t660 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;7iq2 kukum.d-ajt- f reactance 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-mH coil have 14.0 W of inductivk7iq-4ljuw 1u e reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacta huf74s5anqt 4 (adhlkg)b)s )nce 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 induv du.f(q8l4t1 v6 :j1kh fmdvlctor when 120 V AC at a frequency of 20 kHz is ap.q f4jlhu 1kvt186d mf(dvvl: plied 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 coi j )(x44xubf3,az. y1ir; qbnuzin/ oyl 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 .*cdran9 ysd9hx -a78nye)s g reactance 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 reactance at 10pi- .jm6 f(w;,mn qlpv 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 10jdwa (25xu76*; w njaog6ffcrff4(ta-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF cp4l-. 7fw*toy bvs e-a6tphk ,apacitor be 100 W?e,t7s wb-*lk- toh4fpy.6 pva

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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-m1 nv t t(l*5fii2vt6pfF 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 r z9 7k:+idso uanp()wgesistance, 15.0 W inductive reactance, and 10.0 W cnzo+a k )w7(gid pu9:sapacitive 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 impedanmb.3ho bui+f1x *7exdce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s*1mxh.b3+o7 idex fuberies?

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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 y j4jl:q:mi5h resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieij:jmh:45 lqy s?

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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 ms/cl5+yxkjw nev4* p(m hp)( a 20-mH inductor, what is the impeexhpw *(knm)jly(/5cv+m p s 4dance 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 .e x0:7s.um xyky8ce nconnected in series with a 20-mH inductor, what is the phase ans0yey xm.7nx8:ecu k .gle 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 h)fw7((ra5zay3 tpo )ad/ kp mcircuit with a 20-mH coil and 1.0-mF capacitor )mayka(/(p)pzaw3trh5d7 of for a total 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 capacitan-.n;x6i s ya.a cdv l 2oomo3udns:v57ces is needed in series with a 100-W resistor and 15-mH coil to get a total impec5ao6 nims :d.nodv7 ov3ls-y 2 xua.;dance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH0 rb..6v9p2pmj9u*kn+.k nvuf az1s dva qya : inductor at 5000 Hz for a total imkb1fv0j *y:zandnu.v6p2u9.ma p9. v q+arsk pedance 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 rx1jnh:6hc5sl ;edo 95 o/ngnfesistor at 1.0-MHz for a total impedance odehhx n ; 59lj5g/6osnnfc:1of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series w51 eyna;wih8u,,pezyx ++ lheith a 20-mF capacitor. What is the impedance at 10005 u hnyy1+w,ezpia;ehx ,e+ l8 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1fq0 0efm: r1ww*scp7g.0 kHz for a total impedance of 45 W?gsecqr mw7f0w0:*pf 1

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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 for 85zi9n h9 tq*wp+sh1mij 5uq ia phase a91jn95zp q+ hi um5qii8*st hwngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor aen (0nqwo 6)uxvgq.2e t 1.0 kHz for a total impedaon0uqe2gq6x. evn) w (nce 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 s yg)sqil 2.u;w3ngdy4eries with a 100-mF capacitor at 120 Hz. What is the phase angdws23u4qyg)y;nl g.i le?

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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 Hrg-uslxl +v e4ouo*0 2z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are l0e+4rs ox u v-gu2ol*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 of4g9rszsb;a rw3 myt2 8 a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connectrsr t3;9gy8bswz2 a4med 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 cabzup3)5( 2on ol -zrkupacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currentlpruz 3bno(2)ou -zk5 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 containi,d *ap k-1t5*r+ ,tm8 wkk liwxsbgi)sng a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a *d1),5ws wpia8l,k-btk gmrk*i+t xs60-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 500t jue* 8,5 gpjg5(y :pccuhali4taa*0-W resistor for a phase angle of cpju4pc eyg8 gt :l5i u,ta*ah 0*a5(j$40^{\circ}$ 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, L00 gmqzs +5jhd = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order tq5hsmgd0j + 0zo have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resir3j-osqg6;v 6d-8 b4bsnnui fq (7kpxstance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V po4 kupv 6ss bfnb7;j ng8-qd-3or6xqi(wer supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is bevx0 plb6/2e$63^{\circ}$. 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 reyg(:g8hrgc.. lj w3mx sistance of 30 W. What is the power factg :.wh(mclgy8x g. 3jror?

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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 contaii 99v9rrq(xv9mi o1a55dzso tp/+j)ciyrv3aning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when c 9oro(c1mrdvt9 3 va 5ai9/ yxivs9iqp+r)zj5onnected 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 capguu1f 4s s6-/h3hkor*xn yw1gacitor and a 15-mH coil in series?hyshr4f61sog3x*- 1/u wk gun

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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 k(ix38ahbc aj290joF capacitor for a resonant frequenc jaok(i 30c a92j8bxhfy 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 i zhwy odrhm +s:5s*u::n series with a 3.7-mH inductor for a resonant frequency ofz5:uowh+h:msr :y* d s 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 a0m,33j qi q)atql: m 0vgez9xt/gqc1u 30-W resistor and a 40-mH coil if the resonant frequency o9qml,1)0tqtz0:qi/ vea mjg3 xgc 3uqf the circuit is to be 1000 Hz?

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