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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux om5irv,yl7fq-rdk4 2qo+(xa ,j c+zq 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 tng f3w01ci(lxv5z*i (x )yll:g5 bxi ohe $emf$ 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 vs5y7 9 tmjne:of loops of wire in a coil produces what kind of change on the indu79tsj:yv5e nmced $emf$, 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 l8sa ub7pc /.yhoop of wire produces what ki.cp8bha yus/7nd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a/1 iwl4zqn7hawqsd+p +4*bmz loop of wire produces what kind of change on the induces+a4/zn1phdlqbw*qw47i m+zd $emf$, 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 fho 2va-d,j ck/rom 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 indg 6lpm cv(g3w)uced current in a conductor will be that which tends to produce which of the fo gg c)pm(6wl3vllowing 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 f.qz(*o4z2 7ddeekgtt h(p k;d)p6 octlat on a horizontal table. A bar magnet is held above its center with its 7kdpq zg*(d .zhe2 dt)ktooc;4(t6ep north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovnxh1 qtsv6q0.tnt;wg1.. m ege its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whxnmvtth;n e1.. wq gg61.sqt0 en viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where t c5a6hb7m vquw;/wfp )f qy.6vhe magnetic field vector points s6;/ 5f7bq pfqhmy v)6va.wcuwtraight up. The 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 top in a region where the ,wu( 5um yqnzkp4im) kap nu-g (.s1p-magnetic field vector points straight up. The magnetic field suddenly grows stronger. When a)kw5(un-n1 u(p, zpu.ipkgym sm - q4viewed 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 wheazn3x5)gx3q: n g inx )yq-9ajre the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fro 35a9)3nxa:qyqgnj-gx znix )m 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 and carries an ever-incrww ;xyn**yj7 tpu34pbeasing current northward. Two coils of wire lie flat on the;*wu3yp tb p *jyx4w7n 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 v.l4q )cd68ao dfcy1iwire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above6o cdi8)4vql 1cfyda.)

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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 w-uz 4 ux3/bmnlhose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis-u 4m/lxb zn3u 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 xs6n;hr 2ght0is rotated at constant angular speed about an axis whose direction can be varied. In a restg026h xhn;rgion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.5c1v7g vn l)i5ys njv,
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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 thywdvxt.i+g14 m2ksitk3k : o*at 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 fie9f+r .tnnwn)3t vd ;sdld. 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 rfdn nfh*,7 z:iz 2 9sn(rxqjh37a1c tthe east-west direction) is moved northward at conshiat*q7 n1:nz9 27( r,cr jzdf3hnxsftant velocity through a magnetic field that 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 x9d- v6g:)5ml7d nj7jx oagbsangular 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 tw(dn59 i i* 2p /.7rzehvzir qga05axwransforms

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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 e2ivw 7dg9s):mot 9 iazach second. The frequency of the osd) v m2wa9: 9gtz7ii$emf$ 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 o : b*gyp*jf*eused 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 ape-8szo)3 sc;/t, ao zmcwkey+u. /rhu h5q/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 sey17 yavgh ,cm*condary coil contains more loops than the primary coilyc,*h7 m ya1gv 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 coil contains mor zc61wyw7l,zd e loops than the secondary coil theydc7, zl zww61n 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, the power in fk(u d3/ +zt(zf.bt5g 5opyzjput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,alg3p /;yeh1r

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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 connect(fpya,,uzs m7ed in series to an ideal battery of constant terminal voltag,7sapyu (f, zme. 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 induciu hax9j:a+c go**l 2ator are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with+c: hxaoga*lj9i * ua2 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 resistanceuq h85 mt0*szsp3t1e j 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 resistk*(ppopz* (p bance 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 conhvzdbq; l f4m1d0prnzgt )2.)1xyp/*+x slwmnected in series to a battery. The time constant for the circmz xw2lf.d ybph)dm1+ p1 )t*/q zslrgnvx;4 0uit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inducca zm. fo.+z;umy.q we)) 2a +)evdfzytor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the.wca2 . )fdzyya )z ;.o++ )mfqvuezme 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.f-p- bak f s28ccn-aljw(vr3 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, the c z*n y.tcx11)sfp .gdzurrent

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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 -svu jxs2:0b eixv :7bp;u.iucircuit, the current-isj.pue:bb i;u2s:v 07v xxu

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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 change w+qze16aoq ,3r mew(os by what factor when the frequency is tripled?we +3(z1a wo6me,q oqr

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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 voltn)ng5mzm : /x k6zzfchsqe0-7/y:cu4n bmos9 age across an inductor is doubled, the inductive reactance of that induck:hcy 9z:om- g m0 f)snen7csm54n/6bzqux/ztor

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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,yo0y ;e 2)kt(rrdle9d2b z* ru the inductive reactance of that cor2dteblrz)uyrye *2o0k ;( d 9il

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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 trn5uq7l5 :pf bo an AC power supply. In this circuit, the currelqnfb75p5u :rnt

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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 changesc)1wtgkgc z9s )m in27 by what factor when the frequency is trm ws7g9zn1 cgk)ict2)ipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cqy.,fdt;b3wg:s w,5zu +b7answ2 opl apacitive reactanc5,f swa:+,sqwb ptg u3z.;y n od7lb2we 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 voltir(w iq8f5.sl g bn82k-jp0xqages of the inductor and capacitor in a n qbplk2qfgx5ij8w- s0.8 (ri RLC 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 isv+**o1v y.hcuf fx4frladp,h/. q ch) defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of them(ie*m j l-f8+gechh4ok;8rn;+ zehq circuit increases if R increases. When is thi8(8* fz+ hqchjl- eekm+4ng oi;r m;ehs 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 im :d(-icmx: mpvpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incme.y;tuna 8 i o-*vzs:reases 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 ana2 aqw. p*avd w7-ab)pd the capacitance both double in an LRC series circuit, the resonant frequency of thawp-2)a*.wb a7dp a avqt 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 ap669xv;y1e6i x fmy igpplied 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,2nr ;n ej 1i1.pruazy9yd s2l RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of m, 7v;aejcz.i 0.20 T. Find thac,m7i.vj ze ;e 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 magneg6izrmav,q ( fz2 gq.0tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pgf( v6.izmq,agr02z qerpendicular.

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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 inogo8q1ft6n 7tp my,6j2 mpv6v a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pl,t16povpvmt 62 gm q7on6f8jyane 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 redui/e k+wyphb 5 5(j2kkk pp)2qdced 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 chang0ocq b0ffs1wgs *-f+a 9lxk0ges 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 ofxond,5ip)) psb g s)0o wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane sb0pgo)oxsi,dn )p5) 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 wire d4vfe-)g,z ijwith 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 )s0 b b3gk.mw7l1g9qzf wxd2 fa)yew+area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of k;b4z . txiykw68/ vyh60 m flies horizontally at a location where the downwa4yw8 6biz/k yt;xk hv.rd 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 iswk, 7ujr3-- 2zvyesvn 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic vr- j2v3swn,y 7u-zkefield 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-sectiona;xyj *ed7 kp-q i90dujl 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 3handd, yy sp, 8cu+;y +nos(rturns 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. Eac7+s+m j jq-s bo: 9f7dkkwm15+qvy edfh 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 oj -q kdq:s + 51m7wsvjofb7y+ fdk+m9ef 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 gqx8 dj*u3u(u ofa8+ kof 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, v1bmf ts,hdjz 0-r t.k;ui:t simple AC generator with an output of 12 V maximum when rzd mt k0:vu1, ,rsj.tf-;bthi otated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximh c6u5ft0.cgo um $emf$ 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 qym i qlh9 y2;t ix,*fk-ln:r(motor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6+wfx9i,; ry m+f(lqudcx0a w3 .00 W. The motor operates on 120x,d30x (m; y9raulwqcfiw++f V AC, and 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 isws qf, qstp+s3u 6+kds:k;;fmgy(wx0 connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cy+q:wuks3 f0 g mf+d x;t;wp6(q kss,surrent?

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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 poweuw6hm.27 wpuyw o3qx9x 3+ yabnna9o(r supply. The operating current is 1.0 A at full w3x.w6 x(u9pamnnwq9ab7yo + h3uyo2speed. 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 isurr muf13; w 1xpev )igs/4x37/n qlji connected to a 24-V power supply. Theln/ i4wmuju)3g/e1 xx 7r1s r3vq;if p operating current is 1.0 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 neesro)8gszc 5 8v z rb f5v8c.z7gjm)sc5ded 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 tr3g;mjh x7k), z cwtq7xansformer causes 14 A to flow in the secondary. How many turns are in the seco3mqwt hx)7cgk7j, ;x zndary?

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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-V6g1sk+i vp8fm primary if the 24-V secondary has 100 +1v m8 sigf6pkturns?

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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 olf 8mqv)2h4 /erxt6 lprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A,mo8l 6v lt4h) 2f/xqer 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 gt7op4vz c adyv gy5j/- 1p;w*in the primary of a transformer. Assuming 100% efficiency, how many amps yp5av4/cwtzop1yv7g*jd-; g 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 trwg)vz wlt 6ghsp vwy1- t0)z-a;b) wn:ansformer provides 7500 V at 10.0 mA. The primary coil ohs0wbwv)1)ltz) :gna; z ww-vg-tpy6 perates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has wnq0ey883 z0i3;tdowjmzkn 360 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is przone;n mw 3q0k8y3 3i 8dtwz0jesent 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 tu2 yn:5k6xirmy fmrw(9 rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is xr:m5r62yikmfwy n (9present 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 transformrg/29 ;ieozu0zymjr)v60j ze er has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at 0jz9;) evrr u 20zeoziyj6gm/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 transv7c h1 lm2r,ki: 1wuvnformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is ,:ickh lu21n7vv1 rwm100 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 transfo1j4+ 1xkp ke5a(zf zolrmer has 100 turns and its secondary has 200 turns. If the power input to (flx1kapz415jz k e+o the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6 4cft zpvc hmljkb5,8)03/bro 0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbef)bj v4oz ml8h,t3/cp0bkc r5r 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 60oo*u j0b,adzxn7wde 4i8bf29gm, (g:vh7fkt A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission liedbiowam 247bn 7ut(d9h 0*g:,gfx v,jkozf8 ne.

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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 voltpu kmdblx ,* ui9e grs) meay,a,: fc.7pf.9x/age is usually stepped up to 4500 V by a transformer and transmitted thr*a aidk.9s, b:f9mm7)uefx.ru ,eg /l,pxc yp ough 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 0.60 Wsj4:5;p pvcxwz),7a6 yrh vqx. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer hw;6xv 4x7p v :p)az,cyjsr5q 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 qc)z qeak (wm) wf2-(ntotal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer iqmf-w2))cq( znwea k( s 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. Hc 0p5g vq m.0 /9cab4sqfmuz4pow much less power would be lost 5mbgpu4 p0m .cva9 fcq s04zq/if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted ,gl *po ltnxf0 tk)x(4on a line with resistance of 0.60 W. To what voltage must the*fxtlp nt)(k,40xl og 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 mbx+ hc 4 ezcgwb:g23z2*.qsgsuch energy is stored in the coil's magnetic eqzczwhb4:3g 22g bc *x.s+gsfield?

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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 resq eue-t +,w30tbnb-vsistor and an 18-H inductor. What is thisb ts0neq+,vu-3 -wbte circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where o9l13- :9iaukecuo jdahy)d 1the 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 oute 0afym7xhy.k6vg 03r let. 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*7,pz z9bg3 mr fr4ijj-V AC outlet. What is the resistance of the lamzpr*m4b3j 7r jf g9z,ip?

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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 currew8o.zpsfe9vz16kd.h46x: tgr e1 feyntvk.tehosy.zfx8w1e1 pg e6 6z9dr 4:f through 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 120evplc +zt2s,d, fw73 x-V ac power supply. What is the power dissipat e3tp fz cwv,+s7,l2dxed 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 9tfk/z 7,od;quzd6gs 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 5( vd/mqzf y0rresistor 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 j/8p jtleq*xp7;-s obp+ /fc 4edji4W 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 3hjaoijqsc1mc /*2s6-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 uz t4 jq2:c/ztreactance 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 h8/x4duh2).wf 3qfwt lbe, rq yave 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 1gk9am4q c*uc;57 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency aqed+nt pzc:.t 54h+e of 20 kHz isq d:n+z tte+e.p4ach 5 applied 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 dh;m+/:lj 5ua k: dgzciue 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 capacitor at 105jo*:rm/(c(m qzuqcw 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 reactq)3/uf;deuqk ance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reai6; p1xg4i0jgr pkoh3 z 5tzi+ctance 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 wilyua1 u .*(ee;(zx ;r vv2fvhfwl the capacitive reactance of a 0.010-mF capacitor be 100 Wew *r .(v(heu;uf1 fa;x2vvyz?

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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 at 1000 Hz and 5.0)z,.j reiof1 .i/viei 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 m;q ze+l wn,*.cil w q.xm7snx5;*vwmresistance, 15.0 W indwx m;sn;ln,lqecm*qix+v 5.*7 wz.w muctive 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-mHx;+n)( v-mwhq4v aidbdj; 0 wg coil, and 1.0-mF capacitor are connected in( d;qv;0 gi+v4wbw jmhxdan-) 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 1q/qc2bqtj7 x c16r)rq500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are rqc6)bx71qtr jc/qq 2connected 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 with a 20-mH inducto3i4*nz yk9 7hsumecc6r, what is the impedance at 1000 i9h*czukyn 7es4cm 36Hz?

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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 20pur m m.ok1wbom2x2+-n)nad .u d7-lp-mH inductor, what is the phaonmk ab2.w m) 1-m-rdlxu+uondp. 72pse 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 nm cf57-xevk-geq 1d -z5qzbhs)4lfl-eeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?- xe-zq-m e 5zflqgf7 5d-b h4cl)1vks

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followinfa dbc+1*m*p7ej m sv1 d-rln/g capacitances is needed in series with a 100-W resistor and 15-mH coil to get a 7f v1pesd * lrb-+jn/1mc*am dtotal 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 wo -:1huc gdelw7 62xn q6o:bmseries with a 450-mH inductor at 5000 Hz for a total impedbh7no6odqxwmg-lc w :ue61:2ance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be/ i39:yee1brg/lbp1 ccpht -h put in series with a 100-kW resistor at 1.0-MHz for a total impedangy h/e/-3b19 crctlipeb 1:p hce 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 connectb:u .w;ti w)t4kstd9yed in series with a 20-mF capacitor. What is the impedance at 100k4 wi )wdtbut:.9;syt0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fok, hhzn/l/h8yr a total impedanc k8,hnhhylz// e 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 ji55f) s 9 il2u7 lz,zf19ycq(ba bmrz1.0 kHz for a phase anf7 mbyu,cz9( 2s aq59 lz1z)lfb i5rijgle 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 neeh0y; 4gynd j*ibis 4du 0n,ky3ded in series with a 30-W resistor at 1.0 kHz for a total impedance y*h,u 0 bs04y4nk;d3 iyd ijgnof 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 Hj.6l 9vbq 1kgwz. What is the phase an1. jwlkb6g9vq gle?

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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 9 kc , l5hsvik- oaekacil9-825.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in 2ashkko5i 8 a9cce,9 i-v-kllseries?

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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 consist5 3/,gxavlg ol+ *t s6q:rwnhys of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V,awn*vg3l+ o: y/t h56,qrxslg 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacc.mld jcui/-m)alc d+d:4ri.7n v4tb itor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this u .47l/i 4md+-dc):t acjncbdl.mrv icircuit?

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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 RLCqvvq*j4 mcd2d) 6t)v6vqe3tjgns. e( circuit containing a 50-W resistor, a 10-m()) mvst4gde ej2.vqdq 6vcqvn t*j36F capacitor, and a 0.45-H inductor, when connected 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 resistor for a phase4qsy .z-ci6 m0-zb2e nssd*dm angle o-mdsmeid4y 6-2.nz0q *bssz c f $40^{\circ}$ 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, f;50rjbiqm;/2cylqq L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven ;fjqqrq0 ym l/;i cb25in 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 serf1vvq 8/2nm+4c /dhkz +uvyxq*l 5 qlxies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivev +kh/f1xzq+ 8 2lxvuqq5c4l /nd*yvm 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 6 adhp1*d3ps myp:g o.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 6.8qtr1lxj k: bd 4u+t uu0gly-w0vmu8 0 W and a resistance of 30 W. What is the +utb4q0l vuxld uktrg0-: m y8w 8.ju1power 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 fa;ihe)mo o002iay ;bdk ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60;)oadibh 0 o2 i;e0myk-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 capacitof(z f( tpsf/q0r and a 15-mH coil in series?q(f(fs0f z/p t

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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+md ms*4igs l6. wlm7napacitor for a resonant frequency of6 *s nl.+lmw7m4d msgi 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series w6o wxnpd) j8rle.u8f7ith a 3.7-mH inductor for a resonant frequency of 1000 Hz) odun8p6e jxfw7.rl8?

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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 place)w icck*t (vzsh76rz,-c,tul d in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit iw6(ztr ,kvtic uccl- *z )7h,ss to be 1000 Hz?

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