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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 u brs6 lzj krxp15)s/+hnits 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 inductee6*fwq oxpk60z2f q-f w s.9dion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in 0 ,-by,z8hnr sb* mjzma coil produces what kind of change on the in ybbs-n 8j zhm*,0,zmrduced $emf$, 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 maghz(c;1k y v*cvnetic field through a loop of wire produces what kin * h;v1cczvyk(d 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 diameterhsb y0d/ bzyx,*du4ue bu7i6 f5w nfeg,r2-3m of a loop of wire produces what kind of change on the induced xebwuzdf ud r 4mn 2y3,iu6-fhgysebb075 ,*/$emf$, 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 fclta+;g 7mi 64ubo,.s 7wfyy arom 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 oll o2ar3o0wv*a i69kwf an induced current in a conductor will be that which tends to produce which of the foll 06a v3ikwao9o rwl2l*owing 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 horizon wtb, p -5;vznmv388ibhfx nh7tal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abobmht n v3w8fp-7;h zx bi5v,8nve)

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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 fl hs7qo ls,t 2qjhu -3/9 :ga9ye*vyvbwat on a horizontal table. A bar magnet is held above its center with its north pole pointing downs9w7*:t ohqu/-ysq3 aeg9lhv yb2jv,, 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 region where the m9 .-iys72 .aqste1um3tqr y y1dbogl7 agnetic field vector points stra.a1.lq y 9ttq2o7 uy-ri e37d bmysgs1ight 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 table1.b2cg 0nfkm9w8 d(uw j+vzgv top in a region where the magnetic field vector points straight up. Th fdg0cbgju8v9m2v.wz +(nk1we magnetic field suddenly grows stronger. When viewed 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 hor4 s hq wyeopglpk629 r/4;wtv,izontal table top in a region where the magnetic field points strarqgkvy9wo t s4, 6p wphl/;42eight down. The magnetic field disappears suddenly. 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 horizontal table and carries an ever-increasing . zjpzb3k24 zucurrentp. j2zkzub4 z3 northward. 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 loop of wire withv 85 yfm 3y)ic;mxk6putx )r+z the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above)c urxk3)xmyvi)t5;y+z6p fm 8

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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 whof2vn tt;2 ga fy*as/ zl;is; yu*9li1tse direction can be ;l/i92uti2 ts*lt;vy1*fa ysfg ; aznvaried. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cony vi qqhq6k,jpo 4.2k 8khy.2gstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whatqokgkv26p. yq84 2qhk.i y ,hj 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. +hh 5vgo59:g1vvv qsc
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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 th wf;mmourj8+ cg6)w7qi 0 :7 we(vtuwuat 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 maz03vwn tg* a3au- e2mngi;pg+cg . /wognetic 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 i ed/+1ica-q neast-west direction) is moved northward at constant velocity through a magnetic field that points straigicq/ 1-dain+ eht 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 rotl*h1r q,bri2q.jyh7s ates 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 transd1 gklw6 wf+f 6tmfv-v(sw,lk0*e ib 5forms

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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 e j p:/pyigl,8u * bl+4ni+nfpdach second. The frequency of thib g ,ufni/+*jp l+p4pdyl:8ne $emf$ 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 deviceq/; 2ud5t ci -nirm5tp 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 dvv0uy50l fdg o)f f.8gfdmm4cu8/5i xevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary *cj4xvdram06j+3 os 9ii+hcy coil thenr++ai0mhodc j jc y4ivx* 396s 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 pr3rid ewa+zg17imary coil contains more loops than the secondary coil then it is rzei7wag3 1+da

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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 poweq;0-tukakh2m)n(g gt atxz)0 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 resona16+y8h(mzm m jg+y xxunt circuit,

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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 inductor44.)wytvefme oh*z( g are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag 4 .e) ot*gz(h4wvfyeme 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 inhg(lna,c .9dhmq, c, oductor are connected in series to an ideal battery of constant terminal voltage. At the mom m n9( h.aloh,qcdg,c,ent contact is made 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 inductance L and resistance R is connecte-ds6(c(brr9qc 3ft( -ib bdb od 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 inbs.bbl*j + y.eductance 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 connej63h2bh b73av.a eb eicted in series to a battery. The time constant for23iba3vhe67je . bbah the 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 sn:5p30u.p08js rxbfxzk:gl q eries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requiredgrfl pzxu nb 5jx 38q0k:0ps:. 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 u3-eb d8p e,mz5n+bfn(ukvi5jnits 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 s2 d(f vi)i-(i6krfqca lfk46a upply. 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 connov+ qxbv2q3 eu yzf47*ected to an AC power supply. In this circuit, the current32y*evxq ub 4zvo+q7f

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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 ;qepzb* 6md+twhen the frequencymetbd6*+qp ;z is tripled?

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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 isy sdyspc-8. znz)ed+. doubled, the inductive reactance of thatzc-+ pdzn sy.s yd)e.8 inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acr5/ txb wu3qf1loss an inductor approaches zero, the inductive reau5txq/13fb lw ctance 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 u29*z*iw,ewhm8ezzvconnected to an AC power supply. In this circuit, the curren29*zm*zv ,u w hzieew8t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what facf g7r36py*h) s pt8mmutor when the frequency is trip*36 )mh t7pypmfrsu 8gled?

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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 capacy9vxpr/- i v*mgb 4/8p zu.olc)oiow :itor approaches zero, the capacitive reactance of thatyxp 8 o / zp*uwv :/4co.l-9vgriob)im 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 betwe+den qt/aa y)c5zmqpb2:)jg/a ge3t/en the voltages of the inductor and capacitor in a RLC series ct3 ncdb+y2t:e qgq/ma/5a)z j)ge a/pircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as vsz,lp/vf4 l, $\cos M = R/Z$, 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 circuidkn,hk+6ct,z7xprc c ul 4v4: t increases if R increases. p6,rczc k,+ t4x nhlvd4uk: 7c When 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 the6gdqbo*trkc:e5 :w4i cclt0 1 aebvvo7- * ol5 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 cir. o(8a)vcuyh kcuit. The impedance of the circuit 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 capa)3j3tz lu4lo acitance both double in an LRC series circuit, the resonant freo z)3l4la3utjquency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voiw(sj bub(d zx 5tm u))do5h:/ltage. 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 serierp8fen*6nk w+0j .y *gpyvrm1s 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 kknrog1q5t9i5 1sa5sky3 l/r 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 sk/rr a551il ykn ts o15g9q3kthe 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 r bmezv. ltux9)s 26o+madius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planeuet o blmvs)2xzm+. 69 of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field p:1nlwrg z1 -.kc+vqn of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v1qr1z :+nw.g pv-kcl nector 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 singlewzl bo:1qp sl 4x5+kc- 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 coil changes 3q ltujk24sz6 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 wvoeu ;0-lk9 :u*chpbgqr g+7 a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes un bhlw0+ cr9o:v*qgp k7-u;ugeiformly 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 1nkadg 4z.a d+k gxaj6.g9 v)n+5 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 area f q3czxpezs7)b.) ppm67;h cd$0.20 \; m^{2}$ 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 vq odod7 ubs8 +odb/8) -h,tie60 m flies horizontally at a location where the downward component of the Earth's magnetic f-qhdd8dout/, bi+obo8v e )s7ield 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/t obv0 obah8* m long rotates at a constant angular velocity of 2.0 rao8/ vhb0b* taod/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has ;ife p8h3 e0 ktyy(hn650 loops 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 tujv4q p40gyeo9rns 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 itxbg/hie5gbw 0 x1;r9 ss armature. Each loop is 12 cm long and 8 cm wide. The armature rotates swhx ;ixeb/1rb95 g0gat 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 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 turnj xg.tb ) jwu/jj*.zra+goqop-7 - lm3s of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator w1prbh 7zv:sr 4:rw:ky ith an output of 12 V maximum when rotat:rvp bkzsw yr47h:r :1ed 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 generp+w0c/9srb bfphak -4 ator 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 g ffovi8zv/881sk.w t,g n-t8idmmbdx+-+kr 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 have35orm4hcjzn45 dakaacn k/u vp (2 jwe60.qt9 a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full 9jo(w 60/mk 4. k5c4 n enaqrpdvj35hazauc2 tspeed 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 is connected to a 24-V power sls 1l ml8.jni(upply. The operating current 18lm sll.inj(is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W tfj+ij 8ht,)6gb mxv+ is connected to a 24-V power supply. The operating curxfv j+)m+g68bt, h jitrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Th9wxt5 ;4)xogzx v(io re operating current is 1.0 A at fulltxr(4 oxovzg;wi 5x 9) speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pri qvqu/y:pr6n. mary 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 p ffrh(b5k)atbdv( 7;z rimary of a transformer causes 14 A to flow in the secondary. How many turns are ibfhda)bz7k rtf5(;(v n 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 ms5y7v 2s7kdggg8) mzd any turns are necessary in a 110-V primary if the 24-V secondary h7 kz52d)sv8 ygd7ggs mas 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 seco+2-;ika0 q eq;nh5 ky/xuxf hq,f/fghndary coil. If the current in the secondary is 3.0 A, wha +x 5hq,h2ukek fnffq;/ 0gyq/x;ih -at is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficieyq6 6-cg:hvt2u gfda(ncy, how many ampsy 6cgfgd (u6qh :avt-2 at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0b i.80l wopj *fndr-9q*2aqghg (jif. mA. The primary coil operates on 120 V. What does wgfal .jiiq*.fg02pbr( qhjd n89*o- the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its priafa;wtk23 n0h 68j7r uaa4 mukmary coil and 300 turns on its secondary coil. If 120 V at 2.6uj3m0una 7a4t 8a;2 rawhkkf0 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 txm4 ufk+ q2qg7urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currenfkgq4q um+7 2xt is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its 5t3ji,e 5uxu6o t0z j c1z;kdnsecondary has 200 turns. If the in5z;uz0c ,i u1ntkjj 6oe3dtx5 put current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu zwl948sin9g erns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output98l wz9 sengi4 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 tranhklnw)1fli* 0 e /th4vsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output )1llfi40/t kh*vh en wof the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.1(t)w bqhyp;5 tcc 1u6li 0gei The voltage is usually stepped up to 4500 V by a transfo1c ilg u5pw )(;y6qtt1i h0ebcrmer 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 current n,.ir hp d)e-2hm-tdp 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 t rhp2-dd)n p. i,me-htransmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vy o- o)/rxhso1:icy0 roltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find to0yh ) iro:/1 s-coxryhe 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 rujy/ 8a1t 8adresistance 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 it/ a88r1jayd us stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resia3cujoifs3,b (1+ 1r mi.zkqvstance 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 energm +a bic31v z1fs( quj3or.ki,y is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mureov,c(q9, whhx -k +g,htjg :ch less power would be lost if the power wereh (hr,jkw-gvx gco,+9 he :tq, 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 a b:q/7df7 gtvy3w6h dis 440 V at 20 A. It is to be transmitted on a line with resistancfdy/6 wt a7gbv 7hq3d:e 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 current of 5.0 A. How much energy is stored in tnl7rl o-:/hxf he coil's magnelx-r:of n/7l htic 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-H inducgyc :gt-slo3 6w o7u6etor. What is this circuit's time conss lw -6t:g geo7oy6u3ctant?

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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 the rms voltage is 120 V?n 8hg9nsp*(zl

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curreno :w1( zhghqs) .-9o (vylsfn6gx sn8vt?

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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 iz (dt-/quht h*9elk;-mcb;othe lam-bqh( o;/htd*cutl-i9 ze m; kp?

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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 r. ke7pfw+nh0vw gcvu9);t u.120-V ac power supply. What is the peak current we u u vtf9;kn)rh7+wvg p..0cthrough 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 co-vvc bvvon3.2o al *n5bcr)s.nnected to a 120-V ac power supply. What is the power dissipated in the resval vo3o-.5c*)sbn. vv rbcn2istor?

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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 resistor izqwjq/e8ck/dl4 w- za8 ug m(hd:0.tbs $I = 0.80 \sin (240 t)$. 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 cnmz-c3u;:ii; y*0tiy b qm/presistor 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 resistor4fnbkhce1e*+ 0,dmbr 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 inductorz8wy ;m hsyi3; 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 o9 hfa7t9f6nro j 1k;gk5u;irf sp0 6zbf 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 will8f(( rle:vi ki a 14.0-mH coil 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 for 15g8r2jsea, lou+h 6jb97 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 indc;a7ckqr6klgru61 +irztmm6r t.(f6uctor when 120 V AC at a frequency of 20 kHz is applied to it?k(rc1 ; rmczr+ga.u7t f q66lkmti6 r6

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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 throupt)w hl7 c.jhp)q tyi,)ims 9*gh 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 reactance of a 4.7-mF c/*vyvi 6 kkfq0apacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10(l4n + k8gyp /hvvfen8*cz1jiz 13t rq 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 wx xr(,,r-f czreactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reac/ k7jsd7ns3q.;wwhv8p 7ni9z .mqarbtance of a 0.010-mF capacitor be 100 Wh8w qsd 7rmz3.jawbn;sp/ivk9q .77n?

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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 vm.kw// zey z0sze3zq-:sr0s 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 sergqug32 u7ku irr60* jbies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti 76 jiq0rg2uu*b3urg kve 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 Hz54 j y r)bhi+h9jo(kyp if a 100-W resistor, 20-mH coil, and 1.0-mF capac(+ 4h jk9irj b5pyyh)oitor 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 Hzj.s 8fc nfv*wvx(4rc98x*dfcol q +v: if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesvd c*vxnjl *9of48cxfw(8:fsvq. cr+ ?

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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 -x wvem,iy; p*l*2p t(dk nw+bconnected in series with a 20-mH inductor, what is the impedance at 1 bk2xi,yp*l vdnw+p-t;(ew m* 000 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, vzt52kyxw9yh 5 :ge/g what is the phase angle at 1000 He/xv g9g: ytw52zhy5kz?

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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 q iqsc :-u-sk6,,onpg ia.6t w20-mH coil and 1.0-mF capacitor for a total impedance of 1qaw- ns g. s6,qu-cok,i6tpi: 00 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is z6 denna05it7needed in series with a 100-W resistor and 15-mH coil to get a total impedance of dne an56t70iz110 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 ser nb1cno1fb.r.ies with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?. nc.rb1fo1nb

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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 resi.hji ,ylgq)kwt) oeg l7--wt 1stor at 1.0-MHz for a total impedance of 150 e- iy7gl-j.qtto1lg wwk) h,)kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacito-g)hye/ses 8d frm i12r. What is the impedance eyhm sg fi) de/182s-rat 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 kHz for a totay :.mdc. yufp4l impeda.4yufpmy.c d :nce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phac78(v;r c)bgzh sr ;a8v,bio8wk ha.wsecb. orwvb r;(wh7c8 ks;g,va)a8z 8hi angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-pt2:yv*z 4w0hz ff0h uW resistor at 1.0 kHz for a total im 0thyvz 042w u*fhzpf:pedance 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 capar4uh+:rtko)/f. ,4 8l dpk ksinhm:gzb):bmlcitor at 120 Hz. What is the phas4t. n),f dorm/sll:kg+:) kk z bi4brhpmh:u 8e 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 1v)zazyh jm,54yh8 1g. scjej 100-W resistor, 20-mH coil, and 1.0-mF capacitor ay1g)j 5,y m4zah cjsj e.vz18hre 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 cons dk;4l-mu.i,h kw -+hcb rlnb3ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powl,kndr4b .kimhhc ;lub -3+-wer 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,,oje:qt pa/e5l hu n3+ a capacitor 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 floot5ee3hnqa lp/:+,ujws 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 contay4:i7k bky-wm ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductobw7ymik -y:k 4r, 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 phase angle p/ 4z -uaurce,of-acu4,ze pru/ $40^{\circ}$ 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 = a9,q tsmumsku) e-p;;h/hm z520.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfeaum /mh;tez,) h qk;us5- mp9srred 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, 15.0gs5c+5rc g/xv+iha1a W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V +551agv/ r+csicgxh apower 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 Agih),dg9pjx0/1 wbg 6ba-s a+ 3gqgopC 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 s6pbht5 83jg- aqp s1734xwvqpx5ywc of 60 W and a resistance of 30 W. What is the poq4x5 8hs wsgj a5ppby q63c-v73 w1xptwer 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 cir d4brhfx 4w9c1cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow9r db41 4wcxfher 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 cao a9qg*wv0b hu* ;e k3:gj+byspacitor and a 15-mH coil in series? 0b3gs*j:qg 9bv+youeah kw;*

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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 cab ue6q*3jvg/lmo n7qjhmqx:*k 5v o32pacitor for a resonant frequency of 10 k:2j*7*hvgmql v6 m o /3xjub3e5nq qokHz?

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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 for a d;y gt8o.0 z:kpkma2yresonant frequency of 10002;z:o8ap.ymdy0tg kk Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH 7-i:1yqx g tx)oov9ko coil if the resonant frequxx ot1ig) oo y-vq97k:ency of the circuit is to be 1000 Hz?

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