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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: 游客未登录  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 nx 3:v- nka)ijexcept

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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 induaalu y.i(w,1; so2c2auxf ,4 swz;wvmction 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 coihj8 7x2p;cf zpl produces what kind of change on the 2 hfc;pzjp7x8induced $emf$, 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 t k0v4 .m0: mcnw2iaiglv;)zjmhe magnetic field through a loop of wire produces what kind of change onm:im4 .)lgk;2v jcmv ni0a0wz the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of changwnmc 9azlr . 8; -uhur27me/gqe on the induagzr92qu7cn /8m .rel-hum;wced $emf$, 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 ejqbhub4 *.:wfield 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 direh d;y+ bulw9 brl0ok:7ction of an induced current in a conductor will be that which tends to produce which of the following effecu wld7+k 9 rh0;obbl:yts?

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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 hel8bt: l +zdq4o: bhvsubldet7qf/5xtf ;1rm()d above its center with its north pole pointing down. The statio:ed+bo 4xr/ sl:t7qq1ftubl8d m(; 5z) bvf thnary 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 g9w- b hm*tya6kk0ys+flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As syt 9ha kg0*b+6kwy -mit 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 reab(-l3 c/ cakz.ckq.s gion where the magnetic field vector points straight up. The magnetic field vanish s b.qzl -kk(ccc/3aa.es 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 ttvgq2ay:xz i5iz f -2y+k;t(v( 6)kk6t ibainable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the diaz(-6fvkv(ynb2+ a it k;x z)iyq 6i2ki:5gtt rection 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 horizonkfb1ie,x -0 w .dtuogbt*1* wstal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direct,x*obu0e ttib w* -1. 1dsfkgwion 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 and carriexa:iswmxi:1n b.f1 ay8sit; ; s an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wi1aansb:.xx1w ;mt8sii y f;i:re. 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 nort+ 87fdkybkps5 pb mg,2h pole entering first. As the north pole enters the wire, the induced current will be (as viewed from +dsbf8kgb ,pp7 m2ky5above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whos .adwxgebjas 32:zr7l8f+j 6le direction can be varied. In a region where a unif+ew zj8:23fjs 7aa blxrdg.6l orm 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 constox8)q2rqdxf7o yu)f+ ant 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 or28fox) qu f7x drqo+)yientation 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.fz:l /pljov fq1y1)c.
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways tha/xd/qp*lqhtat5 gx ; 0t 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 magnetisr+8h q ; braldzxiphb7 k496*c field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwa.fjvie7wihg2 jdxuk; ( 1k8j9rd at constant velocity through a magnetic field that points straig fjihj 1x7i;9.kjdkw8 (v2geu ht 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 velods8x-stu6 c8 zcity $\omega$ 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 transformsk u/,wx rlx yga;z,(9p

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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 revolutm/r*) j4pdr(8h e rpdr,iu xi0ions each second. The frequency of the pjhir4rx dd,*e( u/r0ip8)r m$emf$ 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 us 7qu6jnwsay4 9uae, us2,yb.sed 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 thav kup*nz r;z)( hf8-aa4l,e uht

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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 the primary ,+ ux 8zw)jekr5axsa8,zy un 8; e7sglcoil then it ,skx xwj;n y8u7gz5 rze8s ae +u8la),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/d/x* mrpla1jtv x1,e3bry 4t/rtx)o loops than the secondary coil then it dtyx rmjtr , rbl */a1exv3 pt)o14x//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 poweg64nz :vy 8k lkuttm xj.7v8k2p4y6nyr 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 circuigw-sw4-7abpnp 9 fwt8 t,

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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 batterqnrq b0a*/ 1 ji3kp v7k t,f2/rfnufj(y of constant tt0 kb(u /qv7knffa 1qn jr ,*jip/f32rerminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ofxq nu7*s*5w wi constant terminal voltage. At the moment contact is made with the bat* 7w*s5nixuwq tery, 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 withsv rl3 n(onetvc7/l ;2 inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 0zyc.4nsj z 2hinductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in sesz u: ..i;ph dcmmoq;(ries to a battery. The time constant for the circuit represents the time required for the curro;zq hp. m:i .;(ducmsent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bp:u2ewm3ag h d*o8)-kl fris 3attery is suddenly removed from the circuit. The time constant for of the circuit r kpd)28g -f ho3ar*:li smweu3epresents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exceph( e*brj 4f9fv8ph;a it:

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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 thd rp*o/u:s cs5is circuit, 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 an3edrau+e+9 jcb(t(1gj3minwoi )r6t AC power supply. In this circuit, the current ci j+9g(t6 1ei rd(3btaemwo)nuj3 r+

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancnzza, f ; b-b2jlpt3a;e in an ac circuit changes by what factor when the frequency is tripled2j nztfaa;b ;3b,-lpz?

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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 ) .7ha xz6h2m69ulsv bjtel.az0*mkjthe AC voltage across an inductor is doubled, the inductive reactance of th .tkvlzuh2)*. hzaa b0x 96ml7s 6emjjat 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 l7/.7q owh pkfsqg,;x *,wf jqapproaches zero, the inductive reactance qjw.,g 7ofq *hpxsfq7;,wk/ lof 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 lverr up*pxykt/u /r1:a ; 38jpower supply. In this circuit, the curre3p:e 8p rv*;a /yu/1ljrkxtrunt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanceb;,lk so0:y *.zrjhim rc snym+zmzc:0 n;; d4 in an ac circuit changes by what factor when the frequency is trihb0mjd.;s: ,rcr 4;y0 zznmmyoc;+:zlk s*ni pled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approac9-,d vhug 1aqches zero, the capacitive r ,vdg91uca -qheactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor a*9nj 9c;u*;i7jb zi/t hnozchnd capacitor in a RLC i9 j;ji/ hz;oubcchn7zt9 *n*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 ciruugdg2-1)*xoi ge, ogcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circq;gdx6s1y r.euit. The impedance of the circuit increases if R increases. When is t dg; er.1xs6yqhis 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 of the circuity ))pztu-qt 0 :7yyf:ex2cty3mez4gx increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increa 9kbo6;d ytwh9i ) bu6mcmwr);ses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double)6sxy(x o 9.zjpa jp7p in an LRC series circuit, the resonant frequency of thajx apxy7 . ozs96)pj(pt circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vk2tvk5p3d(a-58t j w o:plbnt32iznwoltage. 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 oytghw):4 l7d bccurs 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 rotatinv4x 5(-czjuh cg in a uniform magnetic field of 0.20 T. 4 xc5j -zu(vch Find the 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 rotating in a uniform magneti b xvyra 8y.8*tdff59cc field of 0.20 T. Find thbtvfya9.88 y r*fxc d5e 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 in a uniform magnetic fielfrp)6u.l 3sm g *f nade6mb);xd of 0.20 T. Find the magnetic flux through the loop when the plane of m6s )g)emr.f;xb*d 6alufpn3 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 reduced from w:fr2/*t.z iv (iwh dmc,oh)a$1.0 \; m^{2}$ 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 coi :et)diocbk;ml de 05)r,7 flkl changes 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 s(hh*-kurz cc,kq (cr990a nweides 18 cm. A uniform magnetic field is applied peracwr*c0 nk-ehcq( (kz,9ruh9 pendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 wir*fl 71hg2fpq t(,lselq,i0rd) )nxos e with 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 ar.p ky92diw0ih3smt wmuo68y: /m 2 c/kwmaz.a ea $0.20 \; m^{2}$ 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 l0 8r2 kd9yzevfc b+ub,w1d3v7qismz2ocation where the downward cod3 +ze2qbb0kmiy8rd29 u7fs,wvzv 1cmponent 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 pa. .emcmdi 0.2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one d em.c0mi..ap 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 pw*7:7 y pb,; nu+fjt-oieabctgdd 24cross-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 1/1i7/m+k vex pc wag4e00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loopb6fczg ym-mk5qw* a .s+p34yq 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 + myy6 3z p4mw.*cqga-bk5sfqof 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 consgz 45h;ghukc.ists 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 i1mt(-r kt b- 2lt-cfm1ctjm3a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availatk (1mr- 2 - m1-lmtfbi3cttcjble. 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 maximu.5 vv: yog/zdgm $emf$ 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 o)-nrkfb 4xi l /v b)ig)zuq)6rf 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 op34 kg eeeaq/a2erates on 120 V AC, and when running at full speed it geneka/ ee2e4gaq3rates 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 resis :/typj1v:bt j1xpq u-tance 6.0 W is connected to a 24-V power supply. The operatinu/ p:-t1jpx:b1vt jqyg current 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 res+h7 d 3 9ayntx:hcwxsm,vj . 8c)qp9gzistance 6.0 W is connected to a 24-V power supply. The operating cu .:a vcgmy7qth8p dw h),xsxz99+j n3crrent 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 conn gli0zp .s0++dyfr8 bjq41jo fected to a 24-V power supply. The operating current is 1.0 A at fulg81lzojb j4f+ r .0p0sd+qy fil 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 reduce wlwom406eh1grfkwv 5 pd1 *1ca 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 pr(:ieo ,g6q,6 h uaxa9kg-vd ckimary of a transformer causes 14 A to flow in the secondary. 6i 6(-:dk9 oga vexka hu,g,cqHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how max9+nb:;lf.y9rgsey m8s2j b gucuv /9ny turns are necessary in a 110-V primary if the 24-V sec9x m :c n/g vfy y9+.jru9seb2gb;sul8ondary 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 primarc- (jqzrcv8 g-y coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currentc-zg-(rcjq v 8 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 prima;d(wyz s2 ;v w.dxkz 6*ldfs6zry of a transformer. Assuming 100% efficiency, how many ampsy6zv(kx z w;6s*d ;.2zddslwf 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 prg c6 iqv62..rntvxw8dovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe8. riv26g 6 vntxqc.dws 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 300 turns on its secupx68 dmos/yau3v no(ir:3/condary coil. Ifa n uyc/6 doxp8om/:v(ur s33i 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnm841vf +e6dy1va j hxzoj 57ins on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wh5116jfo8id y jnex+vv mh4 7zaat 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 secol j+c(j odip3:ndary has 200 turns. If the input current at th+il 3cp :od(jje 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 200xpk/-bx ,)o:cwvz +ai turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary zpcxv-w),/i+:xb aok 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 yhxvg0uh0to r 1otto13 9:k 6ahas 200 turns. If the power input to the primary is 100 W, we canrgvtx0o13k:90ohy 61to t uha 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.l9kgw d,mvr l4. //akq 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 number of turns in the secondary if the primarym// dr ,qlkkv aw4lg.9 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 curren)jk31nz rb,r +fjdzjvvx)- rk;:l2kft at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1vl r j-));rnrfxf,jdkzkj2+ k1 3zbv:.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 voltage is usually 0p2;abtk 7odzstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the volda2kp ;0oz7t btage 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 0.6 w- uexzdx fz:*tn( 2k(oiz0b60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hewfbu0xk:dn-exz(i *o6z t 2z(ating 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 longfz1yhq- ) 5wxi 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 tra5fq iz-)hy1 wxnsmission 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 l k peq t74 ixk3l,y8e .jn;lw7uhy(af-2ld7vfine at 1000 V. How much less power would be lost if the power werek37,l a.netd(2lxfp78;4 w qfv il ehyjy7 -ku 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 isq2h:x;b,8 ev gfotqf1 to be transmitted on a line with resistance of gboxt, 2e18 qh;q:fv f0.60 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?

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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 issrc-j w8 clq,, fh6i(o stored in the coil's magne 8l-, so(,6wjhqcrcif tic 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 e2ua.;0 jljxwo mry; xk7y eq/+2ct/c 6.0-W resistor and an 18-H inductor. What is this circuit's /e;2ja+7u0e. qlwyk2 /ctoxxm;c ryj 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 cinamd*etr :- 3ulb,qw.rcuit 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. What i5n:b0. pydx.vf * fh/rmab l)ps 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. Wt*(won03qw1x,+) jf s wx.y dfht 9naihat is the resistance of the lamaxwf(1jwy3.qst fd0,9)n*hxn +woti p?

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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 powe13gl 1qlkru-7vp +m jrr supply. What is the peak current throug+ug jrr1-1lmq3vkpl 7h 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 supplywzhm7-hblkz -o7a . gf )4zl9o. What is the power dissi )oazfl oz-m .9h-ghkl b7z74wpated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisiwy3 zg9n*4vlte( (wk w2g hu6tor 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 50j vveovm08 (9rsy i1;gg+hzs7-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 resis)l3tpewb mm)i0 ,u l-stor 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 60c9q ,,.7yxlt1sax qbc 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 2.5piu,/wxjtyb*s -xgyd.4lnpu 0 q2/ p-0-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 inductive reactance?cpbd86u(s b.-c yk (;txuzz6e fg,t,g

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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 Hhf k8ep*6 u *)fnfel(sp/ 7twzz?

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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 60-2kllal +b4)fa mH inductor when 120 V AC at a frequency of 20 kHz is applied to if)+a2 llkalb 4t?

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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 /0j8nds y8:l,ahinn c110-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 k,9iiru6lr lbcl8 5eaa,)h7 n 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 x z*8tf h;-e2;)73grvjgrj5 qhb/url o h 8jfdcapacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mk4 ,s) +lc u/ezwilrk*F 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 capacitiv 7;qa uv,r65scz7*xuemab sz*e reactance of a 0.010-mF capacitor be 100 W?*su x,e;6caarzvbm7 s 5zuq7*

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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 tqdxgj *2 kfgs -n1g:t8hrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W ind5bpl 0s7m*u w3axcd h6uctive7xa*3 s6dhwp mcblu5 0 reactance, and 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 100-W resistor, 20-mH c0 wq wom8clq+/ 8v .fsq2ja08z0ehaepoil, and 1.0-mF capacitor arj/p2oca.sve8mza lqq he fq80ww 008+ e 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 15l8r0svudyu* bce r0h2g4 *m9z00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectesmlrzeh2 40ucg rud* y80*vb9d in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series w su x*+9dv6jpnith a 20-mH inductor, what is the impedance at 100v*9x jdsp un+60 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 seriespy hqi.z7wn06 b *,a;ef ,g1ydsjofr. with a 20-mH inductor, what is the prbae 0df ,,* 1.gszj6foqh; pi.7wyynhase angle 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 circui9xxi w--i yw)qt with a 20-mH coil and 1.0-mF capacitor for aw-9xy)ix iwq- 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 needed in serief(k/+4dsgd( eg j htq6s with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2h64q(ddegsf +k g/ t(j000 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 s5cx7gnuw1 xu qc -jtwel+t)97eries with a 450-mH inductor at 5000 Hz for a total impedance of 40t c5uc19 n jweg-tl7x)uw7 qx+000 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 resistor pp6h u.e4d-ck at 1.0-MHz for a total ime puh.6cp -4dkpedance of 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 connectajw fna r/7+pgs*; ,ated in series with a 20-mF capacitor. What is the impeda7, / ajws gntfap+;r*ance at 1000 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 4 eef y4fge) sq47rdneu6t/h 4with a 10-mF capacitor at 1.0 kHz for a total impedance ofnq4sfe/7ed f ytghee)44r46 u 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 capacitonowiu y*-k,foab-2nhhi0 9y(r at 1.0 kHz for a phase0,ayhow-i9h (nbk*- o 2n ifuy 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 k fn6 75+p0pmqaj gtvpcgo71y9 Hz for a total impedatqpa709 jfpvc g 5pomgy1+ 7n6nce 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 series with a 100-mF capacitor at 120 Hz. Whdwutf:7a+ud7,x vz0mo(q*2j )u ktikat is the pham)2v(uikowuf 0 kxut7 *dzd,+jtq7:a se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 15itdf:.t7 qn- kj7 5creh0a hv*00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedcihv:n dhjk7 a5t* e-tf07.qr in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitq)2wp fpw2ujw0qx5np s x6 g xr/7y2p6or, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powwpxpr0wq2g)j/6w psp5 2u n 2xqfy 6x7er supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance )imaz /6rs:jh5g+bul6e kbm2 s6i7i m30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powe)5liz:beimm 7h 6is/66br+ ajgmsku2r 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 7b/n3h ;lxq 06geqnmacircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suq;x/l3bnna 7q mgh 6e0pply?

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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 seriesffv 48 p*v0gi8h hudr1 with a 500-W resistor for a phase angle of 40p81i8 ffhr*hvdguv $40^{\circ}$ 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 Ru329g2wr n0l,0je dk h/rovbb/4lu kl = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency shoukn vu wed/2 kjrgl400ull,h r3/ o2b9bld the circuit be driven in order to 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 f5j64txt3z+ q gea r-nresistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply6g xzj ftat3 5r-q4+ne?

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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 cirjjzdfl u8o+--cuit 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 anfb(g.ixg3d cx,ua-p/0 kw9 tc impedance of 60 W and a resistance of 30 W. What is the power factorit ( , dw x.3fgcbxgau0p-c9/k?

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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 cirl is nldepok8: r95**k)t2u wmcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powspo m2i9kl*t*5wl uerd nk8 :)er 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.: ;q:glw;tbst0-mF capacitor and a 15-mH coil in series? qt::sg ;bwt;l

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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 capacitor n :wg-f :u6n,zdeq4dz for a resonant frequency of 10 kHz6 ,q :-4wud:engdzf nz?

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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 inductorbc7p.;zp0tr0iy/in* rj9 vd r for a resonant frequency9 .br0ct rrdn;0ivzip*/py7 j of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-3z28 3 cg; 1msmgt1tgf5igu jgW resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000z u3cggj3 t15gf;m8 mggt 2si1 Hz?

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