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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of+q4 cntd c5t9r 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 inducti)ta8v- yubsd*c +* xkton states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces ,rava9 l0 u/ys6z erv.what kind of change on the induceyrsza e arv.u l9v0/6,d $emf$, 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 ofdqi3 gb /y j;b ukf(6cdbp(xns9o9a7/ wire produces what kind;9 i ubq(36cbd/a(gb/n 7x pfsdo9kyj 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 diamete o ww ohji1(0gdirh+:ayc 7cao7sp 95,r of a loop of wire produces what kind of change on the induced cap7w,iowhg51o 7ras cj9 (h +iod0y :$emf$, 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 field / nwsbf8qd0,/zu5 xip wf5mq1 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, thap9n/qb r8+zu-g 2sn ze direction of an induced current in a conductor will be that whichupnarg/ s zz82qn+b-9 tends to produce which of the 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 hhr zoaf*bxw;7auenbbu,0 j5 o j8* yz q5fi-**orizontal table. A bar magnet is held above its center with its nor;u-z *5eaf*5 8b,uy0qi *wfj7obz*j on barhxth 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 itsqn5 qnr/f( 58 rcwoaw4 center with its north pole pointing down, and released. As it approaches the coil, the fallif(a nw4qnw8o 55rcq/ rng 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 magnetic field vect(i at,3pzy pp-0oer) dor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current p0)oytzi- pe rpa(d,3in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the mag6u0cdep g17v ow( dv6snetic field vector points str7odsv 0e1g(c v66 dwupaight 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 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 magnetic o fg;cmg/d 9.;4h uoupfield points stra;4.d u ogfcg;o/uphm9ight 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 liesuhj/b 1vmmqz9 ;ot+v61jzq h0 on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wh o u +m0j1vhzbq/hmvtq1jz; 69en viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with(n+a8mg 2ew;wp2ksa r the north pole entering first. As the north pole enters the wire, the induced current k ;ns22w8gem+ ap(wrawill 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 uk73 45 70rjisgshyih at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ojghs737y5sih40k i ru rientation 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 constabr,k/gga 4 ua2nt angular speed about an axis whose/a2 rg4ub kga, direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis 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. u7n ;89vwhkbmk+*m l,,ynjdk
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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 that m y0lw a(f27w53s 5zummtpl)z 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. Thfr5 j-2ct:hu a- nvdx5e $emf$ 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-xz ,y awl/8lz/d::xzfwest direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning th:z //faxz, wzd8l lxy:e 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 clt1ao5- wjn,bonstant 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 transfork u 2y2o q*jqwhl8/d3ftx 3zmk+c2v:ums

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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 s ;w9bhnmf x91*izrz9oecond. The frequency of the 9mb*zxwo;hrni9 z1f9 $emf$ 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 devic0 ) y u,ykr02gtit2p1bvbxrc3e 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 dev3w kl-iu,d7zjh z2 c -xwr6v4q9 x d8ixv1c6qxice 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 thx+apz*h r r..de primary coil then it i*ahz rr.pd +.xs 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 the second-kydp h2 svkk2( y0+-b8tzom hary coil then -k-kmsk(hb8y v2+o hd2ytpz 0it 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(l ww b 9onptn8*0vtk;wer 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 circu :) 8rc3 knbqmck8z9uh;nd wq0it,

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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;c/ v fw, 1 en.xcjjr(.mgih/q are connected in series to an ideal battery of constant terminagc/q wre, c ;x(./m.j vfihjn1l voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con/ xc-yaqj :*swstant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor iasqj/-* wy c:xs

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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 -vmp2wfn-w yz:1s;:f; wf1d1 xyvs7 d j,gyty 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 av3luq68mg1m 9dnmdg05 fn (hsnd 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 inmksuis+c /9k - v5lug)ductor are connected in series to a battery. The time constant for the circuit represents the time required for the ci-k )u+c/u9s vslmgk5urrent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery is0cwdah4 h 7q,n suddenly removed from the circuit. The time constant for of the circuit represents the time required fh,0nw7qcah d 4or 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 havz+ bc i3(j) df0zwrd1wou.(,8yxdlmee the same 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 b 1/tb7y y apusxpsy(60ijjilj).,s*. 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. gocdi8.ens3 bs(1d 4qb;w 9 weIn this circuit, the curren18 iwnbds;w q c4(e .geo9bs3dt

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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 thf8b7b:mw4e vh9v. muqe frequency is trib:.w74q8hum9vf mev b 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 tz8i we -qfmxa)tz97- yhe AC voltage across an inductor is doubled, the inductive react8 myfi z7xwat--9z) qeance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the ;c 5y:1ix, njsk7 / +d-ggqufu :u*9fjmphehuinductive reactance of sun yg-e k uu7f:x jd/ip:*hm1 c59u;q+j,hgfthat 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, tl0rt4:n d) zuo44qjl+lmelm8he currenlo erlm4lld4084) quz n+ j:tmt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancs gg0 .pvaec4 fa7xn,;e in an ac circuit changes by what factor when the frequeape4,gs;0fac7n x gv.ncy 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 thegd1*u2 ubhv ebo5) t(r AC voltage across a capacitor approaches zero, the capacitive reactance of that capacdo*(ev5bt)urhg1u 2b itor

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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 capacitctbma9w g9(+hl0 g07iiuhidc vbr )5 (f8d/bsor in a RL hds)vd95ibr8c(7htm9+0iw glcfa( 0i b/bgu C series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defixq)9ek3 8 ;wzrmz8wxtned 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 increashzlt ()4 chos 02vj7s+.jptin es if R increases. When is this statement true?vl(cs i.t4 j0hz 2s7tjnph)+o

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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 impj,x1 0kyk+uh+so pwq0edance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impe63:l1r;hc vumwr(g t7da:s m rdance 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 capacitance uq,teys/i l01both double in an LRC series circuit, the resonant freque/e qi 0suy,t1lncy 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 dr flscoh y1f :k:1(pp/uiven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs w4qi e230cx; fe;jhert hen

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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 mqqpq,hz5+ vv 9na )eu; 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;v9h5qeun)qq+ z, pav 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.;8c2(vslgdkmd-x v:5hf gw (wsqq: o.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through t v.mg-d8 h25q(f wcs:;l :gwqodsv(kxhe loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fizz2r4 j0rzlby+f0 + jmeld of 0.20 T. Find the magnetic2 +mfj rlzy00b z+zjr4 flux through the 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 an *4-ktb 1qav ) wqjmbb9adjustable 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 coil chan7ia pdq j0y, mt 1a6m9jfzct,5ges 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 wit if1f3f kklw778obo3uh sides 18 cm. A uniform magnetic field is applied perpendicular to the plane 1 k7uf3w3olkbfi fo87 of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 c y*qz. +4 oshz5m7ljo5lm:lpturns 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 areawh6 swpv5 .jh/ $0.20 \; m^{2}$ 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 wingh-g 9rb/q.s sm vkz7p* span of 60 m flies horizontally at a location where the downward comkb-*qph .gmz7v9 /ssrponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal br9h8ae6y wvcce(to :j 1dl (jb:pa9j;ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant 8r( :;yob jwcaav19tdlej: hp9je(c6 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 gx c,i0n8lehzfvcgnnw. lz0 / k941p550 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 turns of wire ofro5 yhm*sv 88ymsl28vmwv;a; 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 leso6aq 6 v0+bioops on its armature. Each 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 of6b6iaov +es q0 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 turns of wire of are i/a07a)c nb g0 .;g yfj,riln*tdg4eca $0.090 \; m^{2}$ 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 with an output of 12 V ox: pntf+:b :f.x gpk.4+ixyc2s8id w maximum when rotated at 60 Hz. :xsx8p4gyoi2:+ bff: wd. k c+t xn.ipA magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxi0; wtypct8*lm;edva 2 mum $emf$ 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 6k7fr flal18.*olx.h g*lom c2.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operated5 1dduu;u vj0pca(b2s on 120 V AC, and whe 1uj0da(b cp52du v;dun 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 re vb107e 4f7)w fhmwy6ywnj5kysistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current? n h0wy54wb1y7vjf6mf 7)wk ye

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup4px ol /unw:l:ply. The operating current is 1.0 A at fullxp: u/l w:4nlo 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 supply9en2 ,w3nk 7aojfwqhh4,s 7sh. The operating current is 1nj,7k3 sf ewsw2no4hh 9haq, 7.0 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 c5 (zbjnxvj+ :t(x-i ;bp r/bmneeded 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 causes 14 A to fysnlr;g3 pyu fv i1.4.low in the secondar 4 siy.v1g3.ry; nfpuly. 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 aret*ay 2 *1pg54a 5s( (trdxxqyumitu0t necessary in a 110-V primary if the 24-V secondtm xugdt y*saqr0ti 1y24 p5ax*5t(( uary 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 prfdt9l w4sj7-x , a9ljdimary coil and a 2000-turn secondary coil. If the current in the secos fadl9xwjdj4 9 t,7l-ndary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. l 1h6ae +2+n k4ty9gull,bkjmcv ;w su;+ykz5 Assuming 100% efficiency, how many a4 vlaj +zks2umykbek1nl w5;;ycu,+6htl9g +mps 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 provu kd:8, 9d*m,qdgcr up osa.0tides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pri.p8r ,gdu*s0cao9mu:q dd, tkmary 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 itsc z8me5xqc/)j primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage i/ce)j qc5zxm 8s 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 p7e eogcf*)b k.rimary coil and 300 turns on its secondkce o)eg 7f*b.ary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sua3tu z+l9w7:fd dzn( econdary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at thel( 7f+9zau:u3nd zdwt secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 hxlp u;ap76 ;fturns. If the input voltage to the primary is 100 V, we can expect the outp;7;lfuhp x6 paut 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 1i (8rl cjb/ncw+6w k39d)wyb q00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power od)+3w6cq( n cribblky9w/j w 8utput of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at8+ k /gjdd :ysf:ixp-q 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thri:q: k/+f8dpxsjy- gdough 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 at 120 V. The voltage is usually yw-*e.z(tspt+r8i eh 1f3 z e r,le xdv29gk:tstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lgkhtfel r:+ iez -zxewpdrte9.s *3,vy812(tost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120z5)38h ugh* 1zb-nwfewy 1izc 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 transmis5b fzhh 8cnzy*z) i3eg-ww11u sion 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 l ;sgqtq+:n .kv2(or +q0nielr ong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer win +(r.gqqtl0q sr:kv;n i2+eo th 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 kmy q.cx 6;7ecbl7b e.ud long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up wit;6ebcby.d7lxqc u e .7h a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much l-x zvat)bqx /-gy 1us0ess power would be lost if the power were tra)x0-y/ qxt1ab s- uzvgnsmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line6 *r5b9r ngkyl with resistance of 0.60 W. Tnlbg5 yk9 *6rro 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 c3n7:c -a/bqhha9le e1ec;coo urrent of 5.0 A. How much energy is stored in the coil's m -c cn q hblea;3a7hee9o1o:c/agnetic 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 induc;j j/bloeuti5p u-0ph *+2qe8iru;lf tor. What is this circuit's time constant?;u ob+p5-;qjj *theup/lufr2i8 i0 le

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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 ci io1n:mf.,o/ 6 x.p( pmasykstn;-devrcuit 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 placg smp9, a 6hn:asr-+w*m:fq sped into a 120-V AC 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 resis*z t:icck k 7lgs*2b19ablz* *agzp8etance of the lampziza9cp8kkb**cbl **e g gz7at s21 l:?

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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 s:wzk0bgf7 r9e:rach7: ;iq vbupply. What is the peak current through the rr797cwqv:h bgr:b ;af:0ziekesistor?

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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 i828ov jbrir00.elv)- h vxmqi9kv y+ to a 120-V ac power supply. What is the power dissipated in the. lmvy8ikqo) re- vvv0ih80+ 2ijbr9 x 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 lmu15ib.g y dot /l,(d50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorpu:4uoxm4w n ) 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 5 o-l. .ic,qanq0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor atzmlpkh0(5;:v io(k.ej,z c xv 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 reamccbe y.8 dw+*d)a;eactance 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 i)/qdwtuyacc 0kc yn+kr. o*t3328x kinductive 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 reactance at 1000 vbgd 3,n5 a+mqHz?

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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 )/ksd*f:9 yw iimt0nhV AC at a frequency of 20 kHz is appl9sifkyi*ndhm /)0:wt ied 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 source?u qidgy)txff.5 n *qmlkt/9);

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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 cae)vk5+y9t n eiaz 2r5tpacitor 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 te(sw zanurdz81/m/u nb 3 *s5wo have 50 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-;b3wq-jpn ob7b:1 m ck9hse8tmF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor 7i-rlsvo xei;25l * o 3 j3wlqeg0ge,lbe 100 W3* e go,l 5vwq307eo;r2le-xiilsjg l?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor atbz2p7 wnau7ks(+/ xwp 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 12z9ys ( hqe,j-4ughnd,.0 W resistance, 15.0 W inductive reactance, and 10.0 W4(nqhd 9 uhe gzj,-,sy capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and hj,f : ;)ncgws bw) 5ddv(q/zv1.0-mF capacitor are coc qdfvwjwz ,)h:b/ g )nd;(5svnnected 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 1mnklf 6e /ffixvpzd17t9,(9v 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap e nift99(px1/6f f,lmvvd7z kacitor are 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 connectedc, f(rzr) hb4n(f zos: in series with a 20-mH inductor, what is the impedance atf)c:z(s4ror hb (fn ,z 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 20w.i(09pg fl0 wr pesnlm)k::uppom2. -mH inductor, what is the phase0 (i9 0sf w)kgrmp.ol:m2wup.ppnl:e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series ct1.qr 9 xm,vlp9ne- qgircuit with a 20-mH coil and 1.0-mF capacitor for a total il vx.1rn q-9pq,e9 tgmmpedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed inr ;wh,39f mtbv.:,bee 3djry w series with a 100-W resistor and 15-mH coil to get a tojr wwdm,thb ,b;f3.ev y93e: rtal 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 series with a 450-mH inductog g8 :v;lcct-7oi s0dkr at 5000 Hz for a tot c; c7iogg std0k8l:v-al impedance 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 r myh25y7pjij9 fkqw*r*fz g8e7.i5vhesistor at 1.0-MHz for a total im*y hfr5i.*i kjg2p7w 5hvfmq zy79e8 jpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF carxxqzfk2 3k r9-cv66 mpacitor. What is the impedance atr-mrkf2366 z vxkq9 cx 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 aadmwy)e+jkzd ,q6: m 3)ql3rdt 1.0 kHz for a total imqqrd3ew)kd ,a3lmz:m6 + d)yjpedance 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 cm-0qy n7ex-1z*jg xne/vk jy 0apacitor at 1.0 kHz for a phase jmnq/x * zj-0 ykgn-v7e1xy e0angle 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 fo81mfw ak3gx) *yq.fhx r a total impe*3hy1xqmf.)gw8 f akxdance 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 lwgc)w syy-b 1c7sag d4:y(li1f/ai :series with a 100-mF capacitor at 120 Hz. What is the phasll(cw )b:i a-f1y1g:a7y4s wgdci/ sye 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*1ckwzpy1+o n29jma+ 3n ifir-W resistor, 20-mH coil, and 1.0-mF capacitor are connecta* f1nr +wpzn9kj13yic2mio+ ed in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0iitm (o+q2 3lv0pwy4q .350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the w2 vlio 4y(0ti+mp3qqcircuit?

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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 induct3ef. 3+:iec uovs,s)r k4z9uw dh6tgnp:bsi8or of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power 9 ni)wd+.gouh3: ri etsfpu4v,csk6be:s 3 z8 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 containing a 50-W resistor, a (2 ;kx.x8cjdq(vgxp a 10-mF capacitor, and a 082(dxkpjg. v;x(cxaq .45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with *r8gv-olv4z ta 500-W resistor for a phase angle of v* ol-4g8rvtz$40^{\circ}$ 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 xa 7s(d+ ni(qu r-didk1h)iwk 7 +9acw= 200-mH, C = 10.0 mF. At what frequency should the9++n iau-(1r7( wc hxkdq7 kda dii)sw circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit withuplvtm: d*v)5 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power su v*)lmtp:du 5vpply?

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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 y.f4kqh8e0jtsyfzg6 : e(hms0;tv 2 ncircuit 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 aatw7qq+ r(f34 8lpkvi nd a resistance of 30 W. What is the power (8lqirpfwav4k7+ qt 3 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 c vy sdd f)d6;(sgqg;e)ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H igd(;)q 6 v)ydsf;esdgnductor, 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 capacitor and a 15-mH coil ice;yyr* 7n n6g 3)2 mrpnn4fxrn series?cpy7)r36rgm;n2 n f*ne 4yxnr

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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-y qqdv5b/f * iodbc4.7-mF capacitor for a resonant frequency ovio-f* q/ +4ydcq5bdbf 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 c * lcpenqhod-v86:w)series with a 3.7-mH inductor for a resonant frequenccpqhd*en 6 -: c8lovw)y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-z /,dzn2 m2tfj k8kjn;W resistor and a 40-mH coil if the ;knz/jfn2tm,8z d j2kresonant frequency of the circuit is to be 1000 Hz?

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