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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 uni,nhzd 9h boy.p) m,)mrts of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction sts:y0pf a2grsp yq/7+vu8k,s eates 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 oskk-gd)j/rk( dg u0 fy;7qwy ,f loops of wire in a coil produces what kind of change on the ind7,fj-)/0kk(syrq;g w gdydku uced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces wqh-*kjfjop*9 9((t0;e ky dr cf lhzv:hat kind of change on the inducedc*9fjhrqyjde 0(kz: f tkvpo(;-hl* 9 $emf$, 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 wir+ c7q.no/gg2 3phqt9e6m x) hrslfxi)e produces what kind of change on the inducedx.q phqmg2l6 f7/er x+ithg n)o3c)s9 $emf$, 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 fielr*i p*)1knzwr7fex5 a j*n nm8d 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 direcvvkesk*3 5 hz*tion of an induced current in a conductor will be that which tends to produce which of the followiv3ksez*5*k hv ng 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 y :m17gaf,9esym/ /ub takq 8aa horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationam ab am1/9sfy7t 8q :ug,a/yekry 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 above. 6ike+mep1-x yud)(zw;u ck/w og(vs 1qha+y its center with (6yo w 1sg-p kwxzvic+;./)uh( qu+ m1keyedaits north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top 5,z;vq5panq(: skbae;posx , in a region where the magnetic field vector points straigep k;q5 ax:;svnosaqzb, (,5pht 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 ltr yn19d1 bqw/2 7mdwuxt0 w.bbt3a 5table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what iw m3x5dndw.r21tt7u/1 b y9blwatq 0 bs the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnet/4 tpnmznfbp x3+, ;xjic field points straight down. The magnetic field disappears suddenly.btnf+mp3; / j 4znx,xp When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizxeytkki8; ;7u.lo3i* h lqng8ontal table and carries an ever-increasing current northwanuh 8i x3yo*;7eqk;gt.lik8 lrd. Two coils of 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 * f ;pz a4fhqckky.vs/*3ky f+loop of wire with the north pole entering first. As the north p*z4ky.ah; p/fkfq*3c fy+v s kole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is om(fcb ,jm/*j rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,mjcb,jmfo(* / 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 angular speed about an axis whosxyf/2d:5gh swth:, tge direction can be varied. In a region where a uniform magnetic 2 : :hfty5g /,stxgdwhfield 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.gs9r :kj3q- bqz0bm xxkx/-b,
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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 tha4 t6lf5byocg 6t 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 magifx4ec9pxp rhvck /450yt *,dnetic 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 northward at cb dr1y 8ih c0dk/w.qj,onstant velocity through a magnetic field that points straight down. Make a statement concehdi8y, wqcb10 r/j.kdrning 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 vbh w4iy*x7 sh/elocity $\omega$ 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 tx 1gy (pslygisk njip oe2i676*p:5 8l9; blxeransforms

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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 ku trr29gjn2: each second. The frequency of th jrg:2 9kt2nrue $emf$ 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 devicev wgnpyz5+,w4o- 9sduy :*5 k n6pyutn used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tha ccz 4.fq(ztl8t

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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 cz6ph :cdq04 ,kjdob 4more loops than the primary coi4d k0zqpcd4,o:bc j6hl 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 coilm;i v oglk3 kdnm(9t6/ contains more loops than the secondary coiln 6kkm;v(9 mdtoil/3g then 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 po.w w4twyk0,i6h hj7rewer 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 cgua3p+ga jy3ylfi 5 dq9bx33,ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connepki id3*n8wdkh .:a +gcted in series to an ideal battery of constant terminal voltage. At the momiki83hg+:dak dpw .n*ent 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 of 02ke r)u t1,vre/jx:aa+ey 5dvx( nr uconstant terminal voltage. At the moment contact is (ex5,rv jua/e +0)et1: rax rnk2vduymade with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductan ic* -ev(e3qj rat8z17 ,ip4 wywsi5jcce 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 inductance L an cl0f en)m(kql86(oghv( p v6yd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bat27i 28weg+,x:mbnv5i se lixrwc(6p/l yycw4tery. The time constant for the circuit repv 4/:x p i26n,+lwlwsm7ciwie(c 5xyey8rg2 bresents 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 inductor are connected in series to a l a7x; v4kz3,l+8r-qk cs jbnjbattery. The battery is suddenlyj;njbk74-8,zxlqr3 k +lvac s removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sam2sa3d0dr *suzpt kh *3e 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 l ppg,2:9whg5absf5 i this 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 an AC power supply. In this c 2da.e9hp/cy4kizb c4u//n ufircuit, the current/zfe 4 bd/py u2cun9hak/ci.4

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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 b ( 1i1n5gnteran ac circuit changes by what factor when the frequency is tri b1nt5ne1gir (pled?

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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 inductor is doubled, the q cazp20212g bdk eu0hinductive reactance of that inductozp0gcb01 kdaqh 2u2 e2r

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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, trcy 5u,dw5 jjs*s9rjrc4 l38qki9ln)he inductive reactance of that coilickcj)3 l 59r5jqyw* 4s8 r,djnls9 ru

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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. j o4gcdhi95d9f 0rhb7 In this circuit, the curre9cg9rd57h fdo0j 4hb int

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanvzo4ff/u 8a-x ce in an ac circuit changes by what factor when the frequencxf/aof 48vzu-y 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 voltage across a w s+lq )nmrpwy(h/a:ry4(-th capacitor approaches zero, the capacitive reactance ow :l()-( yyph4rhwst+qa /nrm f 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 betw:8 prbs brrpcjc6k-+3een the voltages of the inductor and capacitor in a RLC series cib+c jcbpr:-pr3 r k86srcuit?

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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 i ct. 2 .dq5:+w wi6gvppxae7ics 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 the circuit increases if 4efo6cyesz5 9R increases. sey c e4z5f9o6When is this 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 circuiti jk0mkk5z.5,merw1. jrwkj(ha 66g f 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 circj z0*,3o koqequit 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 botm1f1k/,f4 hhtuynxs)y 4hzw+h double in an LRC series circuit, the resonant frequency of that circuit w f,zhty4s4m11 h/fnxhy+)uwk ill

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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 voltage. At resonanzu4j/u)ivrau 1 ncg7y ::5.im q yydi)ce,

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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 circ)ij (i-i rw,j2k *fx;xohp 1hhuit 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 radib 8ir1 jtx cmv3qj77k,us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thv18b 77x3r, mcjj tkqie 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 0.2h;cwi*hw i* 1/fted9w 0 T. Find the magnetic flux through the loop when the plane of the loop and the ma*;1/ehhwd *wii fwct 9gnetic 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 mazv 7 b2hmnw1w+4jjj uou5 :8gegnetic field of 0.20 T. Find the magnetic flux through the loop when +me2jzvujonh7 ww4b gu85j :1 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 0jq,9ivzs u j-*,tdtqreduced 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 yw+z:ty0 zjpl uc0u;, 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 sidesw;jku ro srhejv; y,.3k -b9rx9)/lvn 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thebr)vv;j 9r9h3nwr xk,sy.klu/eo- j; 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 with 15 turns and ,*hrnhfc5c 8ean 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 a,:n,x3(h a3x iny tfnind 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 60 m flies horizontallyap*lz 5myhpn6)3xe : i at a location where the downward component of the Earth's magnetic fielzi :)ppl * 3a5e6xnhymd 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 ay.i d,lsx))f n h8nv39/ayukos lw/ 4kt a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fldl)f9sh 3 suv4a /kyn.)n k8w ,/yoixield 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 zeof b3qu5/q;di ofqeg r8 lle0 3 o7.1.jc+zhloops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar (v r m b whqo3zvzpi.h8r,5.4hl*3vyeea $0.090 \; m^{2}$ 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 armxw my(6d) 8vflature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axiw)yld8xf(v 6m s parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 tur tpig7:luiw e47 ;agpa*x5nz4ns 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 constructmxfp0 nsnk 8;( a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic nns fp;mk8x0( 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 *l janei;w68nocqs )+maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on vp1zp dl8 g;5wxvcw ;3$120 \; V$ 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 resi99l(g css 6zocstance of 6.00 W. The motor operates on 120 V AC, gsoc6 l9 zs(9cand 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 nqty+g41 siu(x.ts4s+2 ;8wqwk y u dris connected to a 24-V power supply. The operating current is 1.0 A. What is the start8 x ygsn;twq+wdr2ust+k4.4(s iuqy 1-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecte i0snb9 . 7)d c t+ynhdbbu3h*e6sj-uqd to a 24-V power supply. The operating current is 1.0 y) t-0h7 ndb6uu+.bi c*bjsh9s3 n dqeA at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power os0ne69 -1kd eh3qh2mjw a3ousupply. The operating current is 1.0 A at full s 31nm9jo-ka0hqwe d hu362eospeed. 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 1by72evdq0 3l kqk 5hpneeded 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 causf8rt-,r6 xu x8vxcw- ses 14 A to flow in the secondary,s6t rxw8v8 -fruxc -x. How 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 many turns are necessary in a 110-V primary if the v rdo)s5vju+ eod a,:pxa 62w824-V sedpa vr6ao,5v)8o+ wd:je sx 2ucondary 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 a 2000-turn sk73 od.uh.8m nje1cqj g)u:ehecondary coil. If the current in the secondary is 3.0 A, what is the current in th .j k u1 dcmg73o.:uehhenqj8)e 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 transformer. Assumb.s+imc4/, m si*wyeding 100% efficiency, how many amps at 24m s*/biw+cs mi.yd,e4 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 transformerijo h1 e ic0y9pgu;q;- provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dogy- iocpihj; 91eq0;ues 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 pciz x0j9i.3p7 s9tgo60 turns on its primary coil and 300 turns on its secondary coil.oi0i7x3.cpp j 9gzt s9 If 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 turns on its prirj vmv:yjwb4n8)an ()mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current isva)(vr 4mn wjb) 8:ynj 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 secondary has 200 turns. p-a+xej3 .lyr/jscm3pt 1ab +j):q jzIf the input current at the primary is 100 A, we can expect the output current at the secondary t3y+-1.cj je jza:bxs pp/j)qam rl3+ 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 hasukb n36brl u:xvj lti 6/tg:4; 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the se:itnj l6tb;/ v3 luxub k:6g4rcondary 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 9f( s27tr1vz smed5bqo:m;y eits secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiodsb5 etqe(mv9of12zy s ;r m7:nal 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,x,avkyj19s m 60 A of current at 120 V. The voltage is usually stepped up to 45s mv y,j9kax1,00 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 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- ifhc4r8qp (5 opv1t2y,viu ft at 120 V. The voltage is usually stepped up toiu cp ,2fv-5i tyr1foq8 vh(p4 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator producesbc9 dr0*.xh t+g ejls8 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powrxthsdgjeb. l 0*9+c8er 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 lib (rs5wj ov5vpngf1.m 8afo:8ne 50 km long has a total resistance of 0.60 W. A generator producesa5nspfo1j vo5w88m : g(fbv. r 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 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 hastx2ac0d vh)h6 a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer vd2xh)tah0c 6 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. Hp;2h*lsv l eg ziy4+,5q) cyiq4uax 1bow much less power would be lost if the power were transmitted at 3000 V instex s*vpabi,)gh q 4+l5412l ;ceiyqzyu ad 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 on alj4 *zt6/v s 2da69 *gh6ipqwz uaupyabgz 22; line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the o;w bu6dyav2a6 *tp/sjh 2*zg6g4pu 2aq9izz lriginal 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 4fnfic(y53 um zbx*t*of 5.0 A. How much energy is stored in the coil's magnetic fieldf*xc fb (4nzmu53yi *t?

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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 resis*n2xi u*hnbk3 tor and an 18-H inductor. What is this cn 2in*h 3*kbxuircuit'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 wpfho7.j), i blhere 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 A1+mj+a r+mkbnu pij/5 .fkn,ls z0a 92nxtk,qC 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 resistance of thfff08fec/ce0fg 7l d 1e lamf 0lfcc ef8f0dg17ef/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 power supply. 3qc m*wbd+ uxaus625 h What is the peak current through the uhqumwcs 2*b6a +3xd5 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 12wfofg+b:b 3si417c.o i5a vxa 0-V ac power supply. What is the power dissipated in :5bo4v+.o sb17 fcf3x wg aiaithe 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 resr s)wqqa+zh j3fopauv1 3 3.6jistor 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 50-25hbv+-o+ x)q,f d;deafthqo th. 2-msmggo (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 h3x0npw+e w6uresistor 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 ind8u 8i3ru a;zfwm4eo0 + hmqv4buctor 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-mH4ms;oo a;5 lp3dg nrkfn++xu/ 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 cod u 2b+p,cya3jil have 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 f:tlb.-0ys(d dj xnngg,kuv +, or 157 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 imf4tokrw,9 3le7m i:a frequency of 20 kHz is applied to it?ri4k 3,:mw 97io fmtel

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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 throu1 pr:pdmksi09mw71u cgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactani jbl )w;50ijjce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5 e 3i251dclbe7nz,oug 0 W of capacitive 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-mF capacitor have a reactance of 1200 3 8h gqksoi6)+d*uu5oz ,ckdh 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 cay tciec (0x tk+9j,4qwpacitive reactance of a 0.010-mF capacitor be 100 W?xye ct(4c wij,0+9tqk

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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 p benlc7(.aliizz0 z4n- 8l.cthrough 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* wubx*g-in l*p.aie7 , 15.0 W inductive reactance, and 10.0 upi*ax*nbwi *l -e7.gW 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 H nmqv7yfg.of l a5d/37z if a 100-W resistor, 20-mH coil, and 1.0-mF c7m.a5dngoqy3 f7vf l/apacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor9 ,fk0l8sfs*aca1o xj, 20-mH coil, and 1.0-mF capacitor a 18cslfj o*xs faa,90kre 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 is connected i5 /z:hmw.k (z mi/ogttn series with a 20-mH inductor, what is the imped( o/:tmt wim .zg5h/zkance 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 a 20-mH inductor, what is the /f.zq) j 8*vygbuy3x n;qf99 w(i t9v bivn1zvphase angley; gz8z 9uyi(9qf)j9/v.n xqvt3iv*vbfn1 w b 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 cv6 1opy ssd91 uq;-fjwircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1yso6fp w91 djsv;-uq 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 inn i/3t yi),ocew*q)cf series with a 100-W resistor and 15-mH coil to get a total impedance of 11i)/qo* )f,iccewynt3 0 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 serz5 b,uk/ajj rx ywwd/ q-9dl*(ies with a 450-mH inductor at 5000 Hz for a total impedance of l*,z 9dx/a w-jbu yjq rkw(5d/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 putqs1jr r rj0z7o:75ytl in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15r jrj1lz5 q:s7t7ry o00 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 i2sto) h 2bhk 3)ssl2k1vm,prni p2lm 9n series with a 20-mF capacitor. What is the impedan92hsmrt)1pni s2v h b2lsmp) k3l ko2,ce 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 serieep:p - ce zxgu.9orh;2s with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?peh;:gx-pzue c9ro.2

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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 6+3 z1mdr:e lpqkx*is10-mF capacitor at 1.0 kHz for a phase angle om6d3:1irks q elz+px* f $40^{\circ}$?

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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 serkznwsz 9 80 -jqp5:xx9kxbb(xies with a 30-W resistor at 1.0 kHz for a total impedance of 45-x5 pbxwzx0kqn8 z(9:s xj9bk 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 w+tw(k/qed s78 png+ eb:9t vuwith a 100-mF capacitor at 120 Hz. What is the phas7vpwe+ q d8: ngtkt9bswue( +/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 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1vot.i7cpf:fqi y-lxe r::9i 0 .0-mF capacitor are connected t viq.y:0p-:fxfloer i 97c :iin 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 resieg 1(,duom uk97hd ci)stor, a 10.0-mF capacitor, and a 0.350-H inductor. The e7uhgu(m idoc 19),d kcircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capaij)-vy /fn y n/rvq/kh4w:( afcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriesyfk: )y-/4wvnin/ fvrq/ ahj( 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 contai:m 4l0 xas2kelvi2w *rning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connei2s*w xvlkr:4m ael0 2cted 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 s l73mm6tfdrj ,eries with a 500-W resistor for a phase angle of7m3tj6,mrd lf $40^{\circ}$ 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 go,o*0u( bazboca0s fns6r i e- a/mvaap) .+7W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hav() ab 7opamass0nv-*a+e.,u0i/zacb ofr go6 e 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 resiqad g-lmj2 ds*gs9u d vp p4(l,/cq(i5stance, 15.0 W inductive reactance, adc 9l*qla(s-dg/ ip mu jvs2g q5,4p(dnd 10.0 W capacitive 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 circtkjv0vc8/q w -uit 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 reshfpi ,o7 g:h3qistance of 30 W. What is th,pq:f hgoi 73he power 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 factor for a series RLC circuit containing a 50-W reswixwu xtv87r*,qn 4 c:istor, a 10-mF capacitor,4ixu t:n v7 *8wrqw,cx 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 c9-q rq z94vfyoapacitor and a 15-mH coil in series?z-oqvf y9r 4q9

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needewoaxqqc gjp )ld 24,(1d in series with a 4.7-mF capacitor for a resonant frequena x24 q( j,qwolcg1)dpcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-4t dru()aqsj*d1umew2/4g k j a*. jjzmH inductor for a resonant frequency of 1000jmqw*4 gu1tjed/jra( 4*.2 szdau k j) 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 a0;sg)a ri)thu/j sg h/bdb,5in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is t5uj s0a /,)gb/ahdb; r)hig tso be 1000 Hz?

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