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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 kd y1zp4y hgk7u29injup7j3 k7szn,9 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 that whte,6,th+xuwzh 70lv s u0:w the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chxib2 dzgpnm -k4bp;3 0ange on the induce 2nimzb40 g kxp;p3d-bd $emf$, 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 prod+i3h plgomdr-u74hy81 a dkt 6uces what kind of change on the inducem+houl ykt41 6r7hag83dd- i pd $emf$, 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 wfjd7yny 2dq5 wc) e;g6ire produces what kind of change on the induceddwej f5)cyq d762yng; $emf$, 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 magne8( ./ ix 4s.i3strr;yuxf pqmetic 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 induced currew9; h1ma 4ehp/jww/wfnt in a conductor will be that which tends to produce which of the folwwaf;j9 mw// ep14h whlowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne+, fupeb )u l9:0yomget is held above its center with its north pole pointing down. The stationary magnlpo:ugy9b,fe0e m+ u )et 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*0q5d6 hjuvi6i vfl;e horizontal table. 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 (u;i6l d6ife j qh0v*5vwhen 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 w(m64fvgm;cby t.af b +x*wn/where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this c( wm v6wnxtfb*+g /; afmcb4.yoil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regocup(73b4 -2 z f-ic ndh1*cw2rrrpufion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ou *7o-f(pzc43chf2i1wrr ru 2b pc-nd f 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 magnetic fieldljwtr44n jz3w//4-p zy;z d0 akxm,c w points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fikzynw 40/ldmj,4c tpr3- 4zww;/a zxjeld disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-bdg b; p6y9ccx4,ay/mincreasing current northward. Two coils ,c9g6/4mpxd b yca; byof 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 nor,j7p(rg 5 dg, qijz6hzth pole entering first. As the north pole enters the wire, the induced current will be (asqr jhg ,zzpi(76 d,jg5 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 frv yv*t5g6. bat constant angular speed about an axis whose direction c*gbr v.fv56y tan be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angula9 i .l.ihur bhuu4h)z 9nkw 9g(j3lzt2r speed about an axis whose direction can be varied. In a region wheiu zk n9ti wg9bl9l r2h)3uz.4 jhu.(hre 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.pkfb g9 wfxi,1u:h g66
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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 anwqfrf59 l+xlv0l9v* a $emf$ 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 tnazqt1 +bq. v-jn.zed- ;4bt 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 (oriented1b *bsf37+ ak7scl dvc7ogbd 9qm8 7ji in the east-west direction) is moved northward at constant velocity through a magnetic field t7c q*l7 9jib vs81kba co3gd s7bfm7+dhat points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angula. l46 fbw5qpnpr 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 trc qe56, s/z 8bbow( p,pz;b6j+ kulhhhansforms

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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 seconi*,xq gr wdqv,v9l v w,k*g8h(d. The frequency of t**(,hv8w9vr gdg qwx ,q,l ivkhe $emf$ 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 used to1-pz ka wy,zn*k-h y+zv ukw(67sea)y

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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 d)5* nkmc.r let h0q, 2o lhj uw,kmns;7gf0fo4evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thanckdf +l6)-r hs the primary coilfrd -hslk+6c ) then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary c*e(vwt itr5. roil contains more loops than the secondary coil thenwr e5vrt *(t.i it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ths vkx6s ;-ov;cxjp7v.1xovt:0up (cg e power 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 ci(ygd8r fm1qh 5rcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of l -ozqaul0s w, 7pt5s,constant terminal voltage. At the moment contact is made with the battery, the, q w,7p-lols5tuz0 as 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 inb9j8g hxyx0:yductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inh09y ybxg:8j xductor 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 connected to dn p8eb;pep/hkf3nt wt.(l)z ,05i wvan $emf$. 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 connecuwx +7itki7 se*- jq1uted 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 cl;e/g .rrf 4sz*rd 5pe8qqvo g m7j.0yonnected in series to a battery. The time constant for the circuit represents the time required fsr0 ./7pr rflej5 eqg4;z*. qmogy8vd or 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 iswbgs 2/ ej dv*;c8wy:n series to a battery. The battery is suddenly removed from the circuit. The wvebs2 8/j* dw;gysc: 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 4 6 f3cnv4mdqrsame 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 circuit,hze/ vsd) .hendl5 i+g6 2ue)s 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 kkh2k:r dg g5,bh:u1 dpower supply. In this circuit, the current5:gh1, kubdk:h 2 rgkd

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancez, 9qd(8rs ld2tmpp;ha2ze6l in an ac circuit changes by what factor when the frequency is t(zpdt9e2 qp,ad; r6l l2m8 zhsripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an in 4m;6ii;dsuyrc: 0 wxvductor is doubled, the inductive reactance of ; x:vyi drumiw; s064cthat 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 approachesvzr/ndjqk4p-9l k3)bg2 hmsh40 zt) c zero, the inductivebh /l v)44)qh39gcznk 0mt d-pjzr2sk reactance 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 supply. In this circuit, t7 ;dfdrf+uw ,+beu7 vvhe currentu+fv7;+fwur,de bv7d

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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 factoa nz;)j4m + 7cf3 9+dafhqximqt,zw/or when the frequen/;zji ) mn+xaq z,f o7cd+4mhq9tw3afcy 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 )*o bfl:,eclal j9on:voltage across a capacitor approaches zero, the capacitive reactance of that:)*jf9:eoc llb,ano l capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between thvpz/r 50 7xqbcv5 nyv15jgl4se voltages of the inductor and capacitor in a RLpxvgl7vy0b4z5v q51 cnr5/jsC 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 defi v4xlcb;00(h2q qwbey ned 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 impeda.iy qygi, tb 86ff0mg4-de;is nce of the circuit increases if R increases. When is this imb sg,ig-48 y. ffiq60d;tyestatement 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 impedd +4 v4lw8rpylance 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 cbn9icr1y 1n2z frxo/p:p9u,1zdg r4r ircuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both do1 .w xr7ib 1owu x7k,u1clbab16xh7jj uble in an LRC series circuit, the resonant frequency obkx,1ixwlu17c 61w7o 7hj1buxjb a r.f 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 ACivs 8x2 c;f7/oge ,mghv4bu3o 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 mclo 0b (a,yx4r.sv-+gxq;t zoccurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magna ( 9/08y/nfp/y 6k9pechk)fnzguegj i w+ j.petic field of 0.20 T. Find the magnetic flux throgu9nk(+eiya0w n/pp9)fz/g khy c/ j j6fpe8 .ugh 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 rotating in a uniform magnetic field of 0.4h /l.ab1ic1 tzqlz;e 20 T. Find the magnetic flux through the loop when the planeb 1hz4ale1li. t;c/zq 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 inj hw,,t:.dz-9 unii maygx35f a uniform magnetic field of 0.20 T. Find tx3gntz,. im9u: y5- fai,jwhd he magnetic flux through the loop 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 loop is redu( vvv lm* ov/sl55nuy,ced 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 frqtcten5 tjxl/t )a8/2om $4.0 \times 10^{-5} \; Wb$ 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 framesiw/,, ala:- dbk wga9xd 9is9 with sides 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 tasd 9 g9-idb9lskw,w,/ai ax: he 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 an(:tz(6j1,ujng h u smjd 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 abstju b /3ra 4b:c3qm0rea $0.20 \; m^{2}$ 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 at a location3mcbp 2 rwpcy::gfzwfw;5ce p,-,h.z8o6 gp p where the downward component of the Earth's mabze3r,:.c wgppyfgpz8cc,- :;p6p5wf2h o mwgnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular ve 2umqeho. +l 1nhee7s-locity of 2.0 rad/s about a verti1m es.2qlnh7+ eeh uo-cal axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crossya2tai( h 8kb j qb;lzq+0:(bi-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 of area tgj n-)pw 6saw f5v9opuk27e0 $0.090 \; m^{2}$ 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 rbsuo1 d1zs;ci2im/0 gi b44ghectangular loops 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 perpendicuso4; bi2 iid4ghz g bums0c11/lar 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 consists of 100 turns of wire of areuziv+;d (o :je;t ynq*a $0.090 \; m^{2}$ 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 consw w:((*3r qyu*hbi+it 6vd+b, hw jgwdtruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is w,ijwwb+:i*(h y3+ruv6qbd d(*w thg $100 \; cm^{2}$, 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 maximumikz8 cbzlu8b0 56aq dnr7ry:3 $emf$ 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 reyc :dtj*a 07oh f5bb-kd-0yyhsistance 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 DCb,eaca:n6 wphq23 o)2ltd .fa1i n2ae motor have a resistance of 6.00 W. The motor operates on 120 V AC, afnb q a2.hwa3 l:ct,) ni261a o2adeepnd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W u0c 9)b: dhfoh4 7iglk+ wnpsknrz) jm ;4l-9fis connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curcb9))7-g0lrmz:lj4 k hi4fsk nf p+o9hn dw;urent?

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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 ld*qrym1l0w m 17ri z1supply. The operating current is 1.0 A at full speed. What is the bac1y mlzdqrir7*1mw0 l1k $emf$ 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 connehd2b(ny3as e56c l4aw cted to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba bn 3cd6(a4wa sl52ehyck $emf$ 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 transformersoxqbfwk ,1i5shm11. is needed to 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-turn primary of a transformer causes 14 A to flow in the secondm ghw(cvl :h53qq (p6hary. How many hcm6 3pghhv5 (q(qw:lturns 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 i -v- iaj cul:l(0ski7on a 110-V primary if the 24-V secondck aol :-jvusi-il7(0 ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and qy:ku2sfu7/m),hm 15oa zykla 2000-turn secondary coil. If the current in theu,lu fsyz 2)qkmy7m :51/ahok secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transfor4w-owyvn(o */nl wok )mer. Assuming 100% efficiency, how many amps at 24 V can flow in thw*kn-4(wyov/nw )l ooe 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 euy8nx: aos.3 +l hxe2neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120y8l.e2ns h xa+ue3:xo V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 1g 2n7av.374ig01rusxjuttw e0w d xv/sjgm*300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri uu g7t 1nv e j.d2xj0/s1gwmx70gvwtsi4r3a*mary, 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 coil and 300 tuwtq2 +i +m+zeg u5yy/brns on its secondary coil. If 120 V at 2.2 /yw5 uiqemg+ztby ++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 its) xexw,8jr0obn.ylwx2t- j2x secondary has 200 turns. If the input current atxrxjo 2 j.,x- 82txw n0wbly)e 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 if;0neq39rlk+k . ek c/klaieu29w 3s200 turns. If tu 3kw/e.9 k 9qk ra+n2lif k0;lceies3he input voltage to the primary is 100 V, 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 and its secondary has vh w rv6 iqaavb7-;bk6g/56dv200 turns. If the power input to the primary is 100 W, we can expect thehava6 -w6k;dbbqg6/i r5vv7 v 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 volt25z m/mn,e ,vc/ 8ursmyd al(aage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if thscemzm 2,lr/8a,vud( a 5m/yne 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.j2e9 g +gwich. The voltage is usually stepped up to 4500 V by a transformer ang9.hc2ewi+ gj d 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. The lk mzy7y) gld,7,rp n3/rql3t voltage is usually stepped up to 4500 V by a transfolg/l3z)trpdn,l3 ry7q7 ykm,rmer 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 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 0.6z v0tl4uvl qd8 hibc7 fc+)9n1zdb*t60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heat1bu09vlclt th c+v) 4n*7zfz86b ddqi ing 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 residtb7sgk8*gh ps65 w1pr7q 2c z- lkcw:stance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heat7c6c5r lgpgdk7:1sw* wbzqp 8hsk- 2 ting 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 power wouqtu4b f5++rq qld be lost if the powe++5qtbqr4q u fr 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 to be transmie(hb bp1ra/ +zw) 6 ds/ it;zdb9*ifaitted on a line with resistance of 0.60 W. fih ) bbi *+ ( az6rebwsi9t1zp/d;/da To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in thez;va;ra h qub6heg)j 54rd d81 coil's marjv;b4h)ua r;6ged18hqa d 5zgnetic 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 resicq)z h)/gu4iv, vgcd -z8l.fystor and an 18-H inductor. What is this circuiiz g.)dc,qhlvf/ -zy)g 48cvu t'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 7,1n n7tmi+tsy m ct-rwhere 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 plach,9t *d g6khqu7 oj+qded into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resista/)lng5z4vsqzp*5g zb nce of the lampgzz5p s5zqv4n glb/ )*?

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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 supply. What is the peak curt2njw7byc -ga b;+cl- rent thro bg-2bc-7w+nal;yt cjugh 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 supplycwnl 6i 4 :i 6bj;l8vuo5ecuw9. What is the power dissipated n: 4w ejb6ii9u8 lucc5v;owl6in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res3mv1 6zt ext9liy0 he )yg:j*vistor 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 re,: 6crzydkudul -3xl*4d 3bmd6pt5pysistor 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-Wpa)oga.2j p-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 j;6mur/ n:l4 e rxng:,hwhep9a 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 of a 2.50-mH coil at 1w*tjl1vd 8-dby -y fv:000 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 149bbu8mrvg i:)lp h/ p,.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 1000)c;v8 nc4f+she6 91 hu vjgdjb 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 3bn)fk2z6 3rc y8jung inductor when 120 V AC at a frequency of 20 kHz is applied6 )8bn n3f uzg3jkcyr2 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 to a 110-V, 60.07rtr47459bdhth xz t r 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.ru -:ca1hz:pdnk1m.a 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 reactanv,w-n8 x 8bp.,w,x itwtz +wyjce 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 capacito qs(mvs ii8 ly7-fll33r 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 capacitor be 100 e:brz)+qm-8x+skhz7 rg6mz tW?m7 h:+rteq) rs zzxzbg6m +-k8

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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(1+ azlzjkxaw2.k+b ax4i0 ph 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 refollw1lkk v0 k ( ry8-bom65d5sistance, 15.0 W inductive reactance, and 10.0 W capa05fo b r( d85lk6lkywl1vmo -kcitive 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 92knyxv :d8w8f dvx 4xy umavw2 *x)0-iyq*dy100-W resistor, 20-mH coil, and 1.0-mF capacitor a:*vqmyx wy ky)x 2x8x-9u84niv 2dfvd0d*a wyre 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 a-nkqa h903xh z9 o7lt+ ry/obqop2y 5pt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are poxz ol / 20qa-k3nh5t99pb qr+yoh7y connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor isv2i p;uw hwsc .nvo7j4(jt2.e connected in series with a 20-mH inductor, what is the impedopjjv hw.ns2;4 2tvw 7(ucei.ance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with x3ft pwjd4b8+ygp(9pa 20-mH inductor, what is the phase 8wb(pxppty3 j9 g4d+fangle 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 circui a-6bho9xp lo y.58yfit with a 20-mH coil and 1.0-mF capacitor for foaiyo5p.y8xb h -6l9 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 capacitances is needes.af4vq -oel/c w6: +,nlnfve d in series with a 100-W resistor and 15-mH coil to get a total impedance of 1-lqw n /vol.vf4e+,:efs na6c 10 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 inductor at 5000 Hz for a tog lcg :a91xk.atal impedance of 40000 x 9:ag.c1 glakW?

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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 resi5,8ip .lbym,qs pb7wv stor at 1.0-MHz for a total impedance o.pslmb78, w5,iy pqvbf 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 with a 20-mF capacitomg ,y ,-re+-tww+pl9 jd/yihx.e j( dgr. What is the impedance at 1e(ie -rd+d+y t,hg.j ,w-gpwljx9y /m000 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 ne u 0d tsdq),xar:9mm(d y:sx9weded in series with a 10-mF capacitor at 1.0 kHz for a total impe d9ra(:umyqd xd9 x)ms0:,tw sdance 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 capacitor at 1.0 kHz fo5hme 8rsg (uljy8;nmg, (n dp+r a phase angle of( 8(es5r ,+hjnydl;m u8npggm $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n2 h.2ti zzd4b0vm ai;0c7lihweeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 i2t4mizv;0awci.hhz2l07b d 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 atqg+g x6ck*o,.u:xd*zmj/ kdq 120 Hz. What is the phasjo6* x ,/+qd.zku*gqgmck:dx e 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.tt*h6r/g e a d9vyb)7w0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected iyd 7r*/ewbat t9g6v)hn 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 capacitor, and a 0cv8rfdgw: sgn (0l2*o0iwj:t .350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current inf0*v8sij0dt c :g (w:rnwl2 go 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 capacitx.v8lgz6sae4 gmkv br(58. vx or of capacitive reactance 30 W, and an inductor of induv(g.8. xge45bm rzl8kx6svv active reactance 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 containing a 50-W resiston( dqz+z/+bz010,xh7 ytcuwhntt7xsw .7ld a r, a 10-mF capacitor, and a 0.45-H inductor, when connecte, ls.d7t0a +zqhxh+nbz07uzcn wxdt 7 wy( /1td 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 o0y* 3rjfwr6sm vjw9c)3q;pr resistor for a phase angle of;*0r f 3qrmjjsry p ov93wwc6) $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. A6*bcq1i pid6v t what frequency should the circuit be driven in order to have maximum power tran *qdiibc6 16pvsferred 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 ao.v(aq/yuc7 xu;g-v. i a/,8an: jp fmyh1 byfn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuiaa7.g-u(c/yf: yi nax,vo mh f81qbu/v yp .j;t 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 A9 (le6k igew mr3.qn*w8to)fnC circuit 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 ofvoc6 a nub9ik* x0:o*q 30 W. What is the power fac*x cq* ki9on :vbau06otor?

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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 containing a 50-W res5-lt4zuvie(2, s 8m a a;ophqo 39izuristor, a 10-mF ut lp,hai-s5avm3qu o9rz8e 24i (;oz 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 coil in series?afhu, 1u/ 0tf x4y3ocbbu0foa/c, 4xtfh 1u 3y

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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-mm 1ai-*kto5d mn(my s.F capacitor for a resonant frequency of 10 kHz 5y ksam1i*mo. m-tdn(?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need-our as757it p)zkzl/u .ye .oed in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz7.us7e uki.z5t)/or zal-op y?

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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 pla (iu;meet4h 1rwa)f y1ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1fey wtm h4e(1rua)i1;000 Hz?

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