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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 unily68+9 ;ml dp9mdq*g dxu j7l7zm5w bkts 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 indu vy(ozb34lwnph-hwxtu895e u3wm4- gction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces whams0l:6 ugbgk 3j.iv*3a m-i tit kind of change on the induui.* satgi m03l-m6:3gjbvi k ced $emf$, 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 loecp)i /d0 40de0oe quxop of wire produces what kind of change on 0d) xee oi0c q0d/p4uethe 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 pryqswbju.xa,r)wgia 6) e5)4roduces what kind of change on the induwy 5a gbj,uw)). rq)axrei46s ced $emf$, 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 removedkup 1w6ttr,bvt65 -,vc1yrje 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 an in 5h ccms5t.hh.duced current in a conductor will be that which tends to produce which of the following efcsht5mh.5c. h fects?

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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 held above-ok1ljoq77 ;+v d bmrxi.1c+hfof3mv its center with its north pole pointing down. vmi 7;vb mok13jf7xo-ld r+1 . hoqfc+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 table. A bar m9 +a dzx9*l9 ulk)wnzoagnet is held above its center with its north pole pointing down, and released. k9 ox a9z*)zdu9 +nlwl As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region whe//x.ylmxw-3 pb0dc v0mhhxo *re the magnetic field vector points straight up. ml*y whx-/omh00.xc/vx pd3 bThe magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table topor)2uue tw5l; in a region where the magnetic field vector points straight uewlut )2 o;5rup. 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 region where the magne o 08x4tit87zrrnae.wtic field points straight down. The magnetiz.07 x8ar48t tiw nreoc field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table .mf9z5n5lxivu h y (.7d4re ; eyfepa3and carries an ever-increasing current northward. Two coils of wire lie flat on the fzee x7dpf.ay3h59 reyn (.m5v ;l 4uitable, 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 throzy qt( s4tr ye4- o3xu7uc;jp-ugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be u yert(-4zj;uq3 so p4-xtyc7(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 about1 m7ab s4k63gnglb uy+55pocg an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be theog1 s+bm6 un5bk3g4ay5p7g cl 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 constant angular speed about an axis7b(*; e((i pb mdrf(r3bxx grj whose direction can be varied. In a region where a uniform magnetm( errb(jfb7 r(pix gbdx(3*;ic 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.n2 z8 k(t0w3rogig-jh
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that xwp,wx u st d;(40dpnx0fu-7d 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 field0:ywl 9 bd+5b yeu5qjo gu6(vi. 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 directio b ++zv0-h -cpcax9xqen) is moved northward at constant velocity through a magnetic field that points straight down. Make a stateme zcx+ v0h bqc9x-a-p+ent 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 rotatesc4n7rg: vp;ec on2*qj 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 tb8+ecob4 v .+lhfk+g j(c,m lbransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatehpt7e h (w:cor7)kz g;s through 60 revolutions each second. The frequency of the rhcg 7ew(p ot7:)kzh; $emf$ 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 +a:,kae sm0y tused 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 tg++ xhiczrm/aj,- w+g hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary r(vx//j/0cv3uwn33 lftaa c) w8vcugcoil contains more loops than the primary coil then it istf/vc/3g ) (aau rwl/3vwcc0un38v xj 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*d bm9k, efflzl 5c)-j contains more loops than the secondary coil then it is ef9 )-jfcmlk l bd5*,za

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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 inpuc 4i60e(dffg it

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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 c7a2c yty; 4*.8w 5ihsuqq 0laddxu z34idd3lp ircuit,

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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 iw,pd +mv8. xwb+ yryg+deal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor v+8mwgrp w x,y db.y++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 a(x6-wa au 4sybn ideal battery of constant te-awuya 46 s(bxrminal voltage. 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 r/3..hla58eyep xc jt lesistance 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 conp49 ikuv/th3uy:.x q xnected 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 connectedk i;-+ n67eawjp za6l4blco( j in series to a battery. The time constant for the circuit represents the time required for7 ;i aokl jbzpl6e6n+w(4cj -a 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( krh a+ sq1rr6,nf;ed are connected in series to a battery. The battery is suddenly remo;a( req 1d nrs+fh6k,rved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sao3l4+d1anhp ; x tz 1cip8lw:yme 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 circud+md2 cw:fc;3r4e8t+ue y u xcit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, t6o ;m(c)qetnyj/vkz+ he currenyj6/e zn);m q v+toc(kt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the 7r-w a;a e 9bigscoi5sz-2k+f frequenck2b;ifia5 a- s-orcz 7 9wsg+ey 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 voltalx4upm+;t4x2yrg l f3ge across an inductor is doubled, the inductive reactance of that inducto;4 l2l3yx+m 4p xtrgfur

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, tt td6l6*q-tu *zffbhl3f;y eo:rjc5)he inductive rea dcetjf66;*5 hrq-uf)fotz btyl:3 *lctance 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 s7hj0ucu)kp : supply. In this circuit, the currenu: 0u jcsk7hp)t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an;qe69*yb12b0u z ,htqo ldtyw ac circuit changes by what factor when the frequency is tr1qt 6 zl,thq9 yuboye;0b* wd2ipled?

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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 c2i-0ufz si * lb8xj9if,5fq1ep+llpdapacitor approaches zero, the capacitive reactance of that capacit,qf id-ixl pef5*1 l82i lb0+u9js pzfor

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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 eaxx x,exh9z-rdbwy 2l7,o 7.of the inductor and capacitor in a RLC series ci2.,z7bex,lh7d-oe xya x r9wxrcuit?

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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 dei6c-z 46qq7pg 11iln m rjqsb:fined 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 circud6xd ; s )q8g:4ca3hunau swu*e9yi*uit. The impedance of the circuit increases if R increases. When is txg*c* 4u 8)wq3e6:9dsua;ndyuh ui sahis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ooe4f j7w w/g;yf 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 ofc ip*v .p*v6ud 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 capbcj2b0 wp e9)hacitance both double in an LRC series circuit, the resonant frequency of th e)jpbb h20wc9at 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 j udge ;art2 a 8rnr+i5x9oz:-that 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 circuit occurs wkz ws489jtng-hen

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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 ilc 3 blzr l)f68uzr2-vs rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the l 3)zl2v6lrc- lzu8 brfoop 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 i*e fafj-rh/.( 2 zrqgm is rotating in a uniform magnetic field of 0.20 T. Find trg.azq /f(rj*f-i he2 he magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i2 guchgqsvm7hd7-8 /gn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnmh-c/sg7uvgq7 d 28ghetic 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 vg(z sbulv km0p cn;rn+19 y(8reduced 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 cte))71 pxjhnu*op4j *e;szn from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18qm *6- (ofu7 xkvzf-oj 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 azmx-* 6j7fq-oo( kfuvverage 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 uxvow n)ag0mx *pe4g/ qz,*y +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 area cre 3m,tpu,o/gbfu )*$0.20 \; m^{2}$ 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 horizonulw( srtw,55 ftally at a location where the downwa5,uwrsf5w( t lrd component 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 hlj 1m1o8x22.ityp3j qset8c rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while ih8joy22te sjt3p.qmc 1 8li1xn 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-sectidl(o.ijb 5*gional 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 ;v-w1dmzf mq,som0 *up c1*qozi. 8zg 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 lomgj7f,0dwmu:o/ +t k iops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generatorkftwm7/i d o,g+ 0mju:?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consis un5p.f alx.w4ts 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 output88g 6 wnyepyhk;*vo u1 of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 y681p;e guyo8nw *h vkT 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 mrpv (zg+.3x ;x l8i*rtos/l fa maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W 8ntgyt2p(5po . 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 resxb1x3z 5zz)u2wt tw* ristance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a buzb1xt2)zr*w t wz53xack $emf$ 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 kqi2l3ct:/xu supply. The operating current is:c3tq/k ul2 ix 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 24p4o6 g)6p0ta tu)twfp:/rzzh-V power supply. The oper)wt6 phfpr)6/utp 4oz:tza 0 gating 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 is connected to a 24-V pam4: i,tko ehaj.;:swower supply. The operating current is 1hmjas k : i4.toa:ew,;.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to(oc c58wj jl)x reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turt2i,0hmj ( 0dlsqea/ 7)3yifewms7 zxn primary of a transformer causes 14 A to flow in the secondary. How many turns are in the secoix) wey3ze7l ,/0mm jsi( 0hdfqt2as7ndary?

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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 tc;) 6 qq: x9o6oaa7.- u)urm mcaorarrm7x+wkhe 24-V secondary has 100;796 mk7r +6:m.qx-o )acramouxru a) corwqa 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 primaca fcpl(0 5e7p;(e vywry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primfpva7 e5;yec(l(wc0 p ary?

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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 (r s3rix8v 7rjtransformer. Assuming 100% efficiency, how38( rrs7vxj ri many 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 transformer providnuu8 /w 1ne*;/e xeyjwes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drw/ w1jee; u/y u*nxn8eaw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primasljdd 7 x*6y+6a*qyl lry 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 se6layx l syl* +jqd6*7dcondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its se-l4jxah7; c+ ps h5.fcbq ghu8condary coil. If 120 b qc;h4pc+.j uh8laxg -f57 hsV at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and 4z5onct+n + gkits secondary has 200 turns. If the ct4k z5+n+g noinput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary ha oalykv,/ m3v /d8;eom6 lf*w cnw(bs+s 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of th 6,vwv/yeo/lc;mdam3w bn(s o8l f k*+e 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 secondks1v0xm5b 5r r:kwq d;ary has 200 turns. If the power input to the primary is 100 W, we can expect the powmkk1 xsqb ;0vd5rrw5:er 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 u 1jxu*mbxhikq6s78 + 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 u17jkqsbm u+x8x hi6 *W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of dl oapo(c;j a. 6r*9tscurrent at 120 V. The voltage is usually stepped u9(ol6jpaao tcrd* ; s.p 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.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thn :rrs yzebi:9 n 7o4(x*shapzz+mg17e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lin:s+r:7*a9i 4zerh p (y7s z1nxnmb goze of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a to2 u4ptpc05ltg)c6qgg 5a ep/ xtal resistance of 0.60 W. A generator produces 100 V atlta gu qxgp )t55gp0 /e42p6cc 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60u336 ul dj9l-k/h k)tdofvz+y W. A generator produces 100 V at 70 A. In orde)l+uk-/udvh3o t 9dk36j fyzlr 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 doi/4vbkq u0 dbl0wh ;i:vxz;;nwn a 6-W line at 1000 V. How much less power would be lost if the pov ;h0w nlqb; bi /kdu:x4vz0;iwer were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is ,fwn,a ; 1taz owyyf (rjih/76t 2n9ybto be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output bey /w nt jy,62rhabn ;za7o1f9tyw(,if stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the k7t podw i3w3bd7 b,0scoil's magnetic fieldk dt7 bo7w,dbiw3ps 03?

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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-y(a:o kdvh3qoqh4uqtu+); ix p;+a q( H inductor. What is this circuit's time constanp(dk(+;qqq3o:+o x hua 4avh;ytu) iqt?

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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 csq t nv:,srbsw-z6n (5ircuit 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-V AC outlet. Whatg(op 2l fly+u3 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 plac07nqa5v8 r yerj9r -nied into a 120-V AC outlet. What is the resistance of the lamp?q0rn58-7 9j aryvrnei

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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 sf; qnk tr8k12cupply. What is the peak current through the resi ;rtk8nfk21q cstor?

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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 120787 yk b:dotzy-V ac power supply. What is the power dissipated ibyz7 8od7kty: n 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 5t*q.( uq3fui u0-W 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.f6 k+of3cjw bs $I = 0.80 \sin (240 t)$. 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 m.i/b(qg8nqftr8tkzk or/ 32-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 reactance of a 1.0-mH inductor at 60 Hz?(82uew2uluph h v6a*y

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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 c/26sr/+k v iwrg1qs4f fut rg fko-56reactance 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 have52euk 2rxv y :t9cb(qnv11zpb 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at y tvgraj:c6m).*y9 ha1000 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 ,w c4 eczk8edyxb. )2jof 20 kHz is applijke cwd8)y4 ex bcz2.,ed 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 co9z dazm 4wd b*a6s5/0 e1aqvjteh:1bwil 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 capak*e(1 5dp*.y sgpjdqx q9c)kia.x/ebcitor 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 om szmlh)5bp/ 0iks.1lk 9cq+2 j h+ujat 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 1200 q --lauk3 /iixW?

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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 ca)ednv*;r* m)xdtb:f npacitor be 100 W )bdnmfxt:d*v )nr;* e?

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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 a xq ;gw/.pr(fst 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 oft 86:i k-u7,igl li cg*rxi7zo an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, a7oil8r -g i7xi *czgtl6:uik,nd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a n+1mzk:sca7kor. f 5x100-W resistor, 20-mH coil, and 1.0-mF capacic nam1 zxo:kr5.f+7kstor 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 100-W resistor, 20-mH coyzihd0*lsi9 l 0-)fm qil, and 1.0-mF capacitor are connectedsy09 *0lz-d) ihlf qmi 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 serieenztq vx 1w +m*dc53w5z (g9lps with a 20-mH inductor, what is the impedance at 1001*pzgw vq9c55wztm d3+xnl( e 0 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 inductort+gjdh,d93,o i.ndm gs c,(ls, what is the phase anglet9j+(,cls, gmghd, d on ds3i. at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with c *e2c5wuijiymraim1ebc w 5( rn)6i+jp 4 n19a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hpi wuc45*m1jw+ 1nrebc i(e 6 r9nj5iy2 cm)iaz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series w n 3crf7uh*oe9ith a 100-W resistor and 15-mH coil to get3 7fru9oeh*nc a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH lh;ms4ky- ib2inductor at 5000 Hz for a total impedance of bm2y-h4lk;s i 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 wit6xi .re485 mgq/qg bqibga,m7 h a 100-kW resistor at 1.0-MHz for a total impedance om,.i mg 7erig 4b/ xaq6b5qqg8f 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 wiy.teh q 1h.q)ff3 zb+cth a 20-mF capacitor. What is the impedance at 1000.ch.3 1ehqqtfz )b +yf 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 serb+1hy,0m pompl5r1 tyies with a 10-mF capacitor at 1.0 kHz for a total impedancpy5 obmyh11,rt p+ 0mle 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 cao:aymo e69l)eyb2 v 8tpacitor at 1.0 kHz for a phas9by mo2oye 8v6t:l)e ae angle 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 at 1.0 kHz 6 kp1 ;mz2 iayqrr2i.t2 .jimnfor a total impedance opr tq2;z.ii2m6m.2jka riyn 1f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phndllal68x9ox67+ db casen6 d 8x76ollx +ld9cba angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resisto3 cst7 hexu 79rigi)o6e )i:qf, zr1glr, 20-mH coil, and 1.0-mF capacitor are connected in hi9terq)uc zgxr6i7il) 3 o :gs,1e7fseries?

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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-m pi-el;9a ku.mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circui. k-ium9 apl;et?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductor ud )j,y;tj wf.of inductive reactance 30 W are connected in series to a 110-V, 60;) uw jtdj.y,f-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 containing a 50-W resistor, a 1e8vm:0i krt1 :sdd 91x -putsl3vs9ul0-mF capacitor, and a 0.45-H inductor, when connespdltu v-lsu8sk: r:i13xve t d 99m01cted 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 resistoi0j;+- dn l6gdylaz h)r for a phase angle of za gn +jdh-dl)l06i; y$40^{\circ}$ 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,8+ ol kc;qzn4r L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to clr;+o4zn 8kq 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 resistance, 1/e xj , )fgalyo34/xwi5.0 W inductive reactance, and 10.0 W caf, ie wg) o4j/xx3a/ylpacitive 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 circuig89 ,r/gd z- o;.z6mjr3nibqa lo 8zsst 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 h);jw5 g6zbfpduu,;lcas an impedance of 60 W and a resistance of 30 W. What is the p;guf6pl5b w)d ;cuzj ,ower 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 facf .i+ e/jrf2w o,oebl o)s,vv*tor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, jf+f w rv,voieoe2/lo). *bs,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 coil inpsehy xq390mua z; z x)9aat/4 series?yea9tapu ;mx a)/z 9q4xz03sh

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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 c 2ljqjy(rylt:y/8p6 lapacitor for a resonant frequency of 10 kq6p(j jllyy8 r2t /yl:Hz?

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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 inductorli a ic;t+vtb6t.k*2 j for a resonant frequency of 10*tki2a;lb i+.tcvj 6t 00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seri1.xkilxi 1d s)es with a 30-W resistor and a 40-mH coil if thdx.sxlk 1 )1iie resonant frequency of the circuit is to be 1000 Hz?

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