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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 l,-(qr os4 w;s ikoh0gflux 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 t8.efquyhr)daq,-( sqq+/r bc hat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil prod 0o woljsj8w,z,c re/8uces what kind of change on the i eo 8z8l0jcowsw,j,/rnduced $emf$, 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 magne rv1 64i0vkd,vzf:a vdtic field through a loop of wire produces what k:i41advvzfvv6, r0d kind 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 loop of wire produces what kinyfis*al(7;xomoe x5, .a 7 rcwqh6aoz 2e 0-knd of change on the indu6o0mey. -5soq laaxi; zh7ao7k (e,w 2nx r*cfced $emf$, 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 frogq9is 58p b8ignig wt6n:qu+vou/ 00alg1q9 u m 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 an3m kxtcz.li 7954vl y:onu kz 3k37dwc induced current in a conductor will be that which tends to produce which of t5y 79wck7iknx uc: o3 4t.l3dvk3zzlmhe following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontac+ 3dfwtpl2,p nb8so3 l table. A bar magnet is held above its center with it,tpd 8 po3fl wb+2c3sns 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 above it(ie 8k+*pqpx6u ;olj)vw2 gits center with i8 xuvwqp2o ;*p(ei+)j tlig6kts 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 in a redgq9drq)e j ;4gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is j edd; 4r)q9qgthe 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 t vocr/r *vz .rvxen4frz9j. 34.igqy- able 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 direction of the induced current in this coil as the field ix4ij9vr zy e ..-rfcv.ro* g 4zrn/3vqncreases?

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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 thewbkr ,q/q d-c:vjy7 2cdh6b(j magnetic field points straight down. The magnetic field disappears surdcqw 6vk( b/jycb:,jh-72q d ddenly. 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 horizont zbrkr..r z4up; zx9n4al table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induce.rzz p9 .u4rbrk4nx; zd 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 north pole entering first. (haz5v(es1 fy As the north y(ah1fzv (e5spole 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 rotated at cowqycjrmdmy. uc) wyd2l:() 5 cy:b(s4nstant angular speed about an axis whose direction can be varied. In a regioy.cy(um j s 4w(yc)lcy5dd2::r )q mbwn where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abo,3 dnun 7lqxr8wdd x2+ut an axis whose direction can be varied. In a region where a uniform magneticu2n nd3lr+8wdx ,q dx7 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.abf6a +b l9 86hhlbpl *gy+6lk*xa v3c
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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 tiz/b ac9ygx5: 69em( .d cildfhat 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 field. Th6p,rg137 p5d hlojpnne $emf$ 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 northwab*v 56f6ufhkd rd at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.fbd6u6 5fhkv *

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal b : ,1ibbv..kox3uei4 obysm .e5wofa+ar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformskxf nw9/ m()se*u7jof

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secmcxdr5- o:symv* ec-1rho: b(ond. The frequency of the-om:* c1r(:rxds o v5hbc- yem $emf$ 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 uaksj3us3sn 5- -2pdho 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 desw,c) m6 b 9i: 1h.zxjige1ptd8h ;ckyvice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil c 38yh (8ak zfua)j1rfyontains more loops than the primary coil then yh 83urzaay8fk1jf( ) 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 more loops than xxz/ )v7izf/ zp+jx(wthe secondary coilj)7x+z z(xi fzw/p/vx 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 powecmcf -qz:l*f5wu9u( r r 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 circuiwx ju1vcqm/*g08/f n wt,

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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 l/k/u66fc) g j s(rmnhixj5+ iin series to an ideal battery of constant terj /ulx6m/n)ki(+f h gs65 ijcrminal 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 induckscdc9f0.rg7 tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor icd krc7f.s 09gs

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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 resistms 55p v vv772kkr-quvance 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 inductd e-z ypxb1w+)ance 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 series to a battery. The/3o , (iprtpuj time constant for the/ r3uoipt, j(p circuit 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 inductor are connected in se)/i u tw6:xklyries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represeniw /6xyul):ktts 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 exn/p ; xsbxjilr0ft lg/xp ,7m;;c7 p0qcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connecta+. ym;1ea7lkgug ; qaed to an AC power supply. On 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 circuit,*t po55 )0qrmh j,rxj9vs j nk0j.(xti the currenj5qj t)5or,mxrnhvk9t.s0pj *i(x 0 j t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when it;(tkr/ z6ivg s/wq,the frequency is trk/vr/ ,;z tqwi(t6is gipled?

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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 indu9p: :zsag-ok/ 1lpwquctive reactance of that inductouzop pa9wgs-k: / l1q:r

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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 inductorh5 dxg )k5x.pm +tn;mu approaches zero, the inductive reactan)5 xtu; +mmngd5pkx.hce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, 6k5rtg+ovpt ;* m1jbmg 4.hkqthe curren1k4 6;th.mjmv+ptkg o b*r5gq t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes -.m417mkh xugaa21xd r8-bz-xajr ivby what factor when the frequency is d axr82.4h1m- r1jaaxugkbix--v7z mtripled?

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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 c2eq v:jf wgd:5apacitive reactance of thjqw2 d5vfge::at 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 and /gzp/7e4s/v f dw ehg)rlwg8*capacitor in a RLC seri*h8ewzel4f/vd p g /w sr7)/gges 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 h nbqw1 2m0)r2wntmh3b*b e-7j clxt5hqf l,*an RLC circuit 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 circuit. The impedance of the ck*qy;3 z k):fkso(ohrircuit increases if R increases. When is thf: kk3o q)rkho(s; yz*is 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 ct tm5-a a:dh3l4xrv- zircuit 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 cir1 j7xfev(ww7/g be0srqrkr:fe(2 7 jxcuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in aqi:;x -i+:my5zc cz)mhvj(qi n LRC series circuit, the resonant frequency of that circiiv)c:m zj ( :- qx;+5izqhmcyuit 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 voltage. At resonancejh nu rn1hm*vj-,8 e pua8s9s5,

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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 circus: gipu11gl/a it 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 obu.ytkyyt.- ,ik2j 9in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheoi2y ktuty.-9y, jkb.n 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 radif e2a.nk00 ;dd,i4nshs;dt snus 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 the loop and the magnetic field ddn, ;tk;2sihasnfs.0nd 4 e 0vector 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 -xa qdgrs:go0cyw(5 q9tt i-ow,0 2y juniform magnetic field of 0.20 T. Find the magnetic flux through titr9 -:gq0 agq5sct,ox -o0jw y ywd2(he loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of aq s o:1we0)tpjdc/ym/ n adjustable single loop is reduced 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 coj6g .rlmhtho6 d.- 6q;l2em cvil 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 tur vx ;k3jycu 1vil76zy7xw,0z +4onxiins of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average valuez 7unyjxl6ok0yx vi;vx3 i7w1 c,4iz+ 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 an area n)r36c pi2x dz;t:yne 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 andi gmm x3nh .ug26pm-g: 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 horizontally at ac hg42 m5tn5ce location where the downward component of thghncec 52t45 me Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constan4ihxgd4vumc: *i ( m6innnb8t b6ym.pizi;; 8t angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a coni4mz ;ct6d b4u8h i.;y8im :ngixmn6pvbin (*stant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arf.mav2cp(xy;*r3u 6 mbwlc * uea 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 consists4op + d;jw7- izepi1un 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 $emf$.

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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. Eye.pn ;rp46rv ekor0:ach 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 0.3.:4rr r;enpo e6 yk0vp0 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 a-wa*hl g-o6el9gi(yns 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 to5wl3wcj-0 giz construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T i0c3jzlwgi -w5s 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 ge85d8 mjl0cqx 7duw( dj exum7,nerator with a 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 /z z+xo;jf9zpof 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 6.0 ztnjbf37o*/f 0 W. The motor operates on 120 V AC, and when running at full speed it generates a ba7o*nb /ft3zf jck $emf$ 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 v6uk (9*j1bgmdakdv *lnqc39 resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. 1njv9v6mdku9 g(qa*d cl* b3k What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vk 02rlku d tky+ai9k.1b; )fwhh lw+9v power supply. The hdb9 tvli u+ l;kh r+.0wa 9)kk1wyf2koperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W issw b7u584swv g connected to a 24-V power supply. The operating current iss84bwvug 5 w7s 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 n rcl8:efvdjcn,e 9(ce/zp4 q1eeded 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 primasto;ik o/zm ch ;:k9lr +loj55ry of a transformer causes 14 A to flow in the secondary. Ho;ols5+k o:rji/ 5;m t9l zhockw 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 b)af-c3c ss0myf:j5z primary if the 24-V secondary has 100 turns?acz )jy0 ffsm3b 5:cs-

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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 coilx ulcsn *u+e,* and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in *,n l es*+uxucthe 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. Assuming 100% u0f-5 qi6g m5aa x* r0eb gvp:wi:dwa:efficiency, how many amps at 24 V can flow in*-:mxgbafp00gq r a d:v :w65ei 5waui 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 provides 7500 V at 10.0 mA. 4fua9hy k;a3of 8wdv+e q1*pf The primary coil operates on 120 V. What does twd9+ph ;akaf4 v*u ef83y1fq ohe 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 tweg+h89k p8-1lwhw0s*ghn:ln p - ybits secondary coil. If 120 V at :8thpl9wg1lgen-b-+y 08 phhk*n w w s2.0 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 primary coiqajbqhcq /ex-r+oi 4-9d+t nn*r88k h l and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the dr e/q 9-aojcnkth-n84hqi+ bq +rx8 *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 transf2agzm;91i lz,g ha4u*e d- b(urv wq6jormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output c-h9jr21uibue4l zw*;v , dag 6(qgzamurrent 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 secondary7b5z+dor od*i 0j 98v db,yfxd has 200 turns. If the input voltage to the pjo8fdi 0dbo9r5db 7*dvx +zy,rimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondap 6xf 2t,icsy34 lgw.bry has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondf gl6y3 , ps4ixwbtc2.ary 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 ofig;l eow75,nu(chlp c gj- j+/ current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resij,-l c jpg/u;cngi5l7oh (w+e stance 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 current at 12p yc,x,0hgqpbw :02 dj0 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 transmi dp:c,0jqpwbxg0,h2 yssion 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 curren)t .+q id,bspbad;9jht at 120 V. The voltage is usually stepped up to 4500 V by a transformer and trad,p;9db+ . ai )hjqsbtnsmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resyoaj4dt( 11lu ie/5xpv, p wd36u jiv0istance 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 vau yu3ep dpxd0o1t5i 1 ,/ l(jwij4v6turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanu0 dd79i5nlg hce 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 isu0d97i dlnh g5 used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woulfq o2u *vw, 88yztnz8t9oe2kwd be lost if the power,wn wye9 z2t o 8*oku2zqf8vt8 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 tolil 0ep1yi67kx 4 re(n be transmitted on a line wi n6lkl7p( 4ei0xi1eyrth 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 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 oil 61nmt( i0scurrent of 5.0 A. How much energy is stored in the coil's magnetico lm6 0its(1in field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-oi+406*ekyw frr k+o mH inductor. What is this circuit's timi*o eyokrm4f w++60rke 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 circu ,s gqp1r:mm*dit 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 w80zjjt2z2wh . 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 och1)ken7k ,l h.x u8:: bfovltutlet. What is the resistance of the lamp?thf7,oh le v.n:: l8kbckx1u )

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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 connectedumul.4xmp-*n60j bxd to a 120-V ac power supply. What is the peak current throug.xmu-6 pmx ubn04j *ldh 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 sup iu azn*6x2sp+ply. What is the power dissipated in the iau x2p6+*z nsresistor?

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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 resq ep-f 97oe6/c 9m tbfwi.hp0distor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i:,fvf04nsq5zez z-gsb(lhte)ljw .- s $I = 0.80 \sin (240 t)$. 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 reswersd4l1 69rqzp asj 1xx g09h/k8h ,tistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzv2ke5jip9qv;d * e7o s-eg3sj 3u3gwq?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivepjt4vd0b l /z( reactance 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 have 14.0 W of int103tzp ezmzh+2 o9z q 4(1hrs*kigbsductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactancerckof1o:9e5 sc4h4o 2lls kx- 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 whi0 . ):n7zebo se p wek5y-l u66:6aqihq-qzdhen 120 V AC at a frequency of 20 kHz is applied lik56)o07u-eq h:zp6-:seh bq6awdn y i.ezq to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcu q qri9isj) d6n)rz2 nwr7a97f -wq1re?

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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 a3j bi9p:,mtj*sa4 te p6vqs 7r 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 50 W of caqiq:a fpg6 ; y4)hdsx*pacitive 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 -5 ainss9yqd p3( 23sg+jume cW?

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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 cm2tswm;k 8d5 wapacitive reactance of a 0.010-mF capacitor be 100 W?; 85dtw swmm2k

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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 a9mrh k2yt(e kzeh(0w 8 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, 1bwelk9i7 bzy4ig , b6;5.0 W inductive reactance, and 10.0 W capa bl,z6keigib9;y4w 7bcitive 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-m5) x4lnrssoe1a -*o wnrur i80H coil, and 1.0-mF ca1ax ue5n4rsr oon -0s8i)r w*lpacitor 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 resi q:gxljq;aa 2uv285tso* t.xi stor, 20-mH coil, and 1.0-mF capacitor are connected in sgvxx8ja.t*u ;s:2q tq 5lia2oeries?

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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 lcag(5sv8wpat84 , q gin series with a 20-mH inductor, what is the impedance at 10qg8aac (sp 5gw8,lt v400 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 withvk-zt:9kwxz0nvc1-9 *tv zfk a 20-mH inductor, what is the phase angle at 1t zkcv:wzntf9z0k - xvv*-9k 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1 3knb64 qnntf/.0-mF capacitor for a total impedance of 100 W at 1500 Hz /b436 nnqtnfk?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor ans*zh *z* bnt54i/ 6tt-r0xilb ro8pwqd 15-mH coil to geb8wib 0t-*hlnrpo/x*z i r ts 6zqt*54t a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in:d9( onvqj09m vz.spq series with a 450-mH inductor at 5000 Hz for a total impen9:dq . vqvopm( j0s9zdance 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 put in series with a 100-kW resist7rd yq *w51 8c.lcdxypq0nun- or at 1.0-MHz for a total impedance of lx*u0pyy8cnd 7 q-qd15cw . nr150 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 l4 *oer/jfdc7w(ju- e in series with a 20-mF capacitor. What is the impedanceelf*4-wcjur/ (eo7dj 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 with a 10-mF capacitor at 1.0 k 21sh u y6vww-1+askdhHz for a total16w+hv- s skwh2dyua1 impedance 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 capacib uxv14wd* 5z1-i tv zwj 8v4b;ixfo)utor at 1.0 kHz for a phase angleoj4i;bx dtvz4b*v-81z)5v uxf1 wwui of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz foroar/;,ps (rw irs );xs a total impedan)/o, (sa sr;x;spwrir ce 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. lfp 8pt*s/ yr(w4y8t) annq.u What is the phase angayl) 8 swtp4*/qf.(8yun tnrple?

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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 r 7)gcjdu qhpn+1wwx1x-1xt0 resistor, 20-mH coil, and 1.0-mqwg1 xn c1hxtjd+r )7ux1w0- pF capacitor are connected 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/afr x4ip1ox ; 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60xpo4 arxi;/ 1f-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 capacitive reactance 30 W, and an induc:j 43zm: --a:d ufbrtdfior5 ttor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cfm da:t: d-rbojt zf r35i-u4:urrent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W res;pj1,n uvb0v8h6ok 3k(yljll istor, a 10-mF ca j nluv3oj;, kyl8lhb1pv(60k pacitor, 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 seud s5 tysxnczb(/ 1-z(scqa12cic) ( b*qhoo6ries with a 500-W resistor for a phase angle of 1cdn (6*y-q sixztba)q/ cuzb5soch1( 2os( c$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10/r en:2b nqi2-y8yc )2 i7ifwmgk-igc.0 mF. At what frequency should the circuit be driven in order to have maximuy -qw c2 grimynfn-ekc/ ig2i7i)b:82 m power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1re ngws yik8y8 fr 9725)mpex6nz5 kx35.0 W inductive reactance, and 10mnn6y8e53s fewrg87)9x5r 2ykzik px .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-wxy0 y3hmfq ow:flk c a,j/14 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 6t)8+3bzgui *)fra sj x0 W and a resistance of 30 W. What is the power f+)zuts b)3i 8rajfx*gactor?

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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 containi6:qc; u.ymoz.1a klosng a 50-W resistor, a 10-mF capacitor, and auozlscyq:. 1;.km6oa 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 frequencyz)o.(a2 d rbo0apr(u8 wu:hbl of a 1.0-mF capacitor and a 15-mH coil in series?lpohau(br8uzr ao.d2 b0 w( :)

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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 seel,+7dwaom..ovx q9 rries with a 4.7-mF capacitor for a resonant frequency of 10 kH. x qo7m. dr,lv9wea+oz?

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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 inductor qj4rw , 6mq0ai)inha vk-m .qj3)yx-afor a resonant frequenrqa-)m - qi 4qy,j)hk 30wxnajmiav6. cy 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 witd (y /uq+evvf)8f6pyzh a 30-W resistor and a 40-mH coil if the resonant frequency of the circuif z(p8)uvqd+ fey /6vyt is to be 1000 Hz?

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