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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 mejm; m.fym os55gb0+w agnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tharw8tg fld+w -(t 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 what kind of ce3*h8sl1nu ru)/tclchange on the inul*1ntl ru c)/hsce83duced $emf$, 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 l5v h+mhh-/ojm oop of wire produces what kindh-jm+ /mhov5h 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 vm-t e bsy -fiput5i;x734k ssc 0l.u)loop of wire produces what kind of change on the induceb3m0spey u7 s5i.4xfkut csti-)v; l -d $emf$, 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 mag796nvui cgcl. netic 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 directions(snz :wpg0 m1 of an induced current in a conductor will be that which tends g zw(0pmss:n 1to 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 bg lzcrla:*iniqwrfuv hj) h280,2*+ a horizontal table. A bar magnet is held above its center with its north pole pointing2)fjr:,l 0unriwg +*hva2i*c 8 hzqbl 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 magwcs p7:z 4p;* ae8e.bfs: bzdc)+bypwbf9da-net is held above its center with its north pole pointing down, andw+fedwb.)9bca7y p*4 ze::bdf -8; pzpc assb 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 t0wct 2m (prpb;f 2a2i+wcn)hlable top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewean0cw)t+pfpb2ci2;m( lh r 2wd from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top x+kk lf.y9+ic5g16tdeys ckf x4ms(9 in a region where the magnetic field vector points straxc59tmy6sci.fd l(g+x sfy kk 91+k4eight 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 ta8*y( amne ej(h ljs*u5ble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is thenam(e* 58y(hs*le ujj 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 horizontal7g8--k ) giiblrljmy- table and carries an ever-increasing current northward. Two coils of wkglb-mgy 8r-7 -ilij)ire 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 wi49 a ff3gutdmd0l2iaw/s qk,9re with the north pole entering first. As the north pole enters the wire, the induced current wilfmq4 ,u9 iga0kl 9 sftwd3d/2al 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 cb93 gm)ull1eu onstant 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 orientation of the loop's axis of rotation if the inl9 3m gl1ue)ubduced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an f l6q w.42)ywjc*s w+wn.mhtf axis whose 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 if6fs2qwwhtwnc* 4m +)f wy..lj 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.py mi hy:kn8-do i,dp*/,o 45frienu*
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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 tp jr,i pv2u2.ihat 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 mabozkjahqt8s.ny z; +v,p. 9t 4gnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) isr twj8yb1w*6dxj zm7+ni bz( 0 moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning (wiz brm6ny0 j *xb zd71w+tj8the 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 rofkx6gp)md -pty.*m igz2yr f 4 g+1rk8tates 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 generatobl. teei*i 26a-ctm5qv 3d84kpx b5fn r transforms

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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 second. The fresa4e*;n h3sob1 a0 n6deqh3rjquency of t dr1s63n;0ej3ohn4qh* ab saehe $emf$ 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 d n8m(d,9zblb*ztfy4or d /lf 8evice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th(fwgl7 -j)mwvb2 tc3a at

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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 uz(x rffv1h6o- d;o 4kthe secondary coil contains more loops than the primary coil then it is of;vh-41fo(dxzuk 6r 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 contaivt)f f1x qg :r v:sq8i;- ecy/cue/lo;ns more loops than the secondary coil then it isv/:;i:tqs1eqory8f f cuv) le c-;x/ g 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 rs7i *dc/u(y jpower 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 circ 9ngpr8mj7jzak1,i a 7/b a2gy7x:j-. wjztnxuit,

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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: / , /py5)tuorcejbag are connected in series to an ideal battery of constant terminal voltage. At the:r //ap,c5outeg)j yb 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/kw38c ikkp2aj ek ::o of constant terminal voltage. At the moment contact is made with the bak /pi:ew 3k jo:ac2k8kttery, 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 wit0qw nuyn2 /87ukpl e8ph inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L ax:r9c*+u ho ignd 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 indu aogfh wocnj;a0hwx/; ,l/ dg(o6fu16 ctor are connected in series to a battery. The time constant for the circuit repreon 6ffj wwh;xlg d0 o/co6u,/( a1gah;sents 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 connmx p3qru vv,gn8 h*)1wected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for t*hgr3n w mv1qp)v8xu ,he 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 u)21x6a tb b wa/ nuqcf(-jc(kexcept:

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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 o(oay,3i4 dkm 1gxk 1kpower 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 pu9xe9 oe v (/ s(efiqzt8*(span AC power supply. In this circuit, the currenftipe v(/8 (9e*zue9q(soxspt

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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 the fre :;m52 nt,ldoduow 6iah*a 6tohhi),-cbwug9quency :othbmnw6ugl, o2a5 6acd ,htdw)9uoi-h i;*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 is doubled, the inducwhvuu -h wz.*.9do,jctive reacta -w,jou v..z*cdh9huw nce 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 8c04adxmo x1sthe AC voltage across an inductor approaches zero, the inductive reactance of thadox m8cs04 1xat 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 circu7gc8w uyt f;2mit, the curre ;2mc8w7tygf unt

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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 factorw4b p,q6 ,kgya;qj tsjf+.tt, when the frequency is tripled?t+6,k;q,yp a4j .gsf bt ,jqwt

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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,fk ,y t:bm7aud ee2)zml*6r2e the capacitive reactance of that cz 2 dr*ye :,fletmb62ke7u)a mapacitor

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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 capp*b,c s eu5iu6acitor in a RLC sbpueuc5 * i6,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 ci ohh qb5d5u30u lsv:*kze:- tircuit 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 circuit increasej zpk-2 ,cbd0nh o.,kfs if R increases. When is 2 b .knkc ,j0p-fodzh,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. bdvipos:td1 63r u8u: )ce 4ymThe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i b- mrq8 ;lhs6q(ayc4gncreases 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 cao50iq v,isp92j +nnwbpacitance both double in an LRC series circuit, the resonant frequency of t2j iin sqo5, nv0bpw+9hat 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 ckilb)rb 2iq 6b2gu4jpe.7; l is driven 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 cilp;g c/ e18;hjk+ ttlsrcuit 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 ispp:sib 20g3o f rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a 0sbfop2 3:igpnd the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniformr+e 6 qvuiu7d2 magnetic field of 0.20 T. Find the magnetic flux through the loop w 2r7e6viud+ uqhen 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 field of 0 j4hab01cibw;tgi 70u.20 c7 gbi 4wt1hjau0bi ;0T. Find the magnetic 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 adjustable single loopg32, pc)z2h x z upstst)*tv mm9.wq;e 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 cha;3 2zmof,(hpyuu+ d jmmxy3 9xnges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.cu.k3 lj5 5lbr A uniform magnetic field is applied perpendicular to the plane of cr3u l55klb.j 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 turns aa0 99hr;3c0 p.7 bxoj iyggns7xreg/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 4l8 t-89+vx lqlhv0tyye 0israrea $0.20 \; m^{2}$ 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 wif;wc gd1q +h5mz9 .rpmng span of 60 m flies horizontally at a location where the dow rmqpz.h1dg m+w59c;fnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocitf2p;fe7 8ekovjc ob45 y of 2.0 rad/sf72evek;jof bpo85 4c 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 50 loops andw31d epr+t n,z 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 ofc*::zabt9: hpq y7h)fz zd+z.atv9mw 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. Each loop is 12 cm lz+b z9n4(n;yj7qzq s wong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of r j qznz q4sz(nb+7;yw9otation, 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 turne: ivwa+xsd/- s 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 simp( ajd91uib0a v6g x0oxle AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.xd 1g(0j oa6uiav0b x9050 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 g-oww.:f oncd+innlq - *q+ :svenerator 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 havf+ /qu2jh46;uhhhgk l e a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W5btbk+z2q3wuaa i8 5 e. The motor operates on 120 V AC, and when running at full abae w28iuzb+ 5 ktq35speed 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 powex6tb0u7j,oqli(rz / ;d hie,zk 4ri9ur supply. The operating currentqji0i9/,k e7z u6o,r dthbiz u;xr(4l 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 is connected to a tl*;-kej.s3lm 1ngya 24-V power supply. The operas ntm1* ; 3-gy.lljeakting 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 is connected to a 24-V power supply. Thqloc 9*s4fdb1e operating current is 1.0 A at fulc 4*qlds9of1b l 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 need uez7 3dwhscj.h fg ;-k fid:68vt-et;ed 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 polv6;ifc 5qg -bd3+ bgrimary of a transformer causes 14 A to flow in the secondary. How many t5;bbvqgfo3i dg-c l+6urns 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 arz:tbs g qs2rnp1(l)c n25e/rve necessary in a 110-V primary if the 24-V segz/21r:rb q n()t ssvp enc52lcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondar; mi1i2 ivrq5 9g40lsecskmy)y coil. If the current in the secondaryl;1e )c20rsyi4 im9 iksmvq5 g 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. Assuming 100%b26hj w(fm0fw x 1pxoh+h6m3b efficiency, how many amps at 24 jmhbxbf+w0p m h(w26xf13 oh 6V 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 npy(wrl9e-1u/k -v+f yue9x6 h1nyjk teon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primar9eh /96uj -+u 1 kyypkey-nvrf1tlxw(y 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 turc)mnwv xrz5+c: +zt.nk4b jm+ ns on its primary coil and 300 turns on its secondary coil. If cr jxzb5+4nv+n tmc m.:)z k+w120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns v) k+-ujw1uv6lkug0u on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curr06k- uku) +vwgujvul1ent 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 tran u xsdyg5he: lv.rx,3.sformer has 100 turns and its secondary has 200 turns. If the input current at the primary is,y3 g: xdexrs5. vlhu. 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 transform k9lkw5 :.kwbic3 t5fyer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltabtk5i5 l yk93fww.c:kge 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 100sl xy5rd 8a0 a2s3o8yv turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frica8 oxs3 r520 8asldyvytional 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. The voltage is vuu cxqi( 8:z4usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns iqcuz: i4xu (v8n 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 z lk:6/(tj tmxmq1zuzf9/ag 1 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 transmissiolq j/1 1x/mtz6u9g(z t kamz:fn 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 0xe.p1,qyp 9ob aofn(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 percentafo a 09q(e,b1yx on.ppge 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 resistanczx - (l5.evn kr dydz(s89jqp;ee* 4lie of 0.60 W. A generator produces 100 V at 70 A. In order to reduce en- r exv8n;diqdz9sjpe (lk5 z( 4el*.yergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gejbv+,xc.+7o1 h*k8vtzq jz mdnerator 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 10 oxk,7.h j dq+* jc8bz1vtv+mz0:1. 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 V0gi2nqphmd ttb7y8r;z6g 4m7)6t uk n b8)ubc. How much less power would be lost if the power were transmitted at trq8b8mthbdk)4 6y7mp) gbuzu0;i7gc tnn6 23000 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 lin; osyz+qbu ) -:k65bnwyw/nd ie with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformbwb/;y sku+nyd:w o znq6)-i5er 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 be8ls- v9uk( wcurrent of 5.0 A. How much energy is stored in the coil's magnetic fieldv -wk9s (el8ub?

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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 co t0pg:hxt;9jrntains a 6.0-W resistor and an 18-H inductor. What is this circh;r90 :xt jtgpuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit whertt 6otd pbgvp49 x/k4.e4(guk e 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 outletw fxx)x+*cp i;. 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 placeqx5idyj9q. 4 ad into a 120-V AC outlet. What is the resistance of the lamp?q.4 xdiyjq95a

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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 suphz 8vgi9v 67joply. What is the peak current through the re zgi vh7869jvosistor?

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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 supply. Whafg 5otyq;y1d+t fc*ia9 2-j(n bd, (g-izaltht is the power dissipated in the resisf1(f-; +tcjg,*dlaotz52 g-iiby tn q(d9 ahytor?

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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-W6g.z)b +axu+j(w.shouk0wy f 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 50lwoyjm.km u3 71 my7-i-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-i7q4 4j -mlxwtW 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 at 60 Hz?mm;klx 9 w e0vd8awvr;h y5(,s

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivfhi oui1z27q x t79n1te 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 havvuv/bbey279 j9lyyqa/9g 7 mue 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 157 W of inductive reactance at 100y o/,/ 88 gq )*dar)ggmkpxqyq0 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V ACeast,rh/d gbj/vl8 5sm p2(*o at a frequency of 20 kHz is ap dmrhsa2/ eg/tov*j5s( bp8l,plied 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 duvrlx1m.t)gtm ; hj: e.e 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 capwm-vxn rh 1b+ wrs/;d)iiw9p 60l dey2acitor 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 reuq:jdadpr1 2,actance 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 a2 l/l jg czh:mi3(j,pof 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 oud 0-ho:d3geap n: os+t7+j orf a 0.010-mF capacitor be 100 W?+:+3or0 dneh dtp:a-ogus7jo

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz r,ocgzv7qg1o -pk3a 7and 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 resistan nkmc(i ;zm53b3v)cp +m a5jneva(e,zce, 15.0 W inductive reacta53b,(cjmz p+;mzc a nmv(n e5 eki3)vance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impe r7g 5 eqz7xg,ft,dtl+scl g+2jab 2c1dance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are tjzadgl e+7s7 1g cc 5bl2gxt, fr,q2+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 resistor, 20-mH coil, and 1.0-mFg/jah0 0 d vf,24mbajr capacitor are connected in sjb hj mfa, 004ag2dvr/eries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induaca 8 *n,*l(cyew;i73qmqirm6 f4 hqlygs- ,bctor, what is the impedance at 1000 Hz? *nq86h,4lye3f siyimqcr;l *(gaqmca, -b7 w

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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 inductow a,n*j gy( b54sklfz3r, what is the phase angle at 1000 l*nbw(sy fg3zj,a k45 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, 7 cffs bdxy1;yew;,t and 1.0-mF capacitor for a total impedance of 100 W at 150y1 s x7fe,bcy,w ;f;td0 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 capacf7 t7lvfmn u3qx -a 4r;v9:crtitances is needed in series with a 100-W resistor and 15-mH coq la79ffrv;:n t-3crx4 v 7tumil to get 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 series with a 450-mH inductor at 5000 Hz for jlzn6v2*x0v5q;d lzq a total lz 6vv0qq5;x z dln2*jimpedance 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:525de amikce5(i 6 isrgy+wf resistor at 1.0-MHz for a total impedance 5 i:fw syc ae2r dei+mi56k5(gof 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 f)nzx l8kd3e ry5+j k,in series with a 20-mF capacitor. What is the impedance at 1000l,)ex +5j8rfn 3ykkzd 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 auohphc o/6:+g k 9x0bk 10-mF capacitor at 1.0 kHz for a total bhogcxko:p+96 /0u kh 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 se)5uuvwle,r(rv 69y mwries with a 10-mF capacitor at 1.0 kHz for a phase angle of w)myru v 6ewv(l9,r5u$40^{\circ}$?

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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 seri- 2et1xg,s kx5s4n fjk ystl 4b0b0u(aes with a 30-W resistor at 1.0 kHz for a total imped0ks-nay5(eb4,lb1 ktfg js 4xx2s0utance 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 capacitou9 b)so(:ktr:) hrzupr at 120 Hz. What is the phase anglebh:k( s )o:utzr9p) ru?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH co56u)ari 2 i p/euwgbv-* wrt:til, and 1.0-mF capacitor are connected in ser):b 2uaet*r-w5v u r/iwtgi 6pies?

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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 0.71ze 8raethlxq84mbv 5fx/t*g5z +tx 350-H inductor. The circuit is connected to a 120-V, 60-zf4b5 +5/hg1 7a*lq8x x ezxettv t8mrHz 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 capacitivezk :ri0*8ofi)dm/y wt reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in tkw :/0mozyii 8r f*t)dhis 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 j82kbe a f4fyn cr(hl 8n9i7si5gdw/ -50-W resistor, a 10-mF can5yg 7 nf29ilesr d(-4i88 /kfchwbjapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor fpd. ydyj1y41 /r; flpvow)kb: or a phase angle of11pd.p/y of yy:)bw l4vk;d jr $40^{\circ}$ 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 h3+wd/u dd /kb6ym(hlh)0sz j = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drihzshbdw 6 jlhk)+3d/0 (ydum/ving 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 seriesc /9l u.bpqp5g,f1od p circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pof9cqb 15./ oplgp, udpwer 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 anaiy(j /vw -vn ;i0mi4s0mk3ip AC 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 circuitem3zjwi 8y /1q0r1jayi;w r t0 has an impedance of 60 W and a resistance of 30 W. What is 8t/0 m0i 3w1awe ij;yrj yzrq1the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 5x ooi6*ju6 e9l;9emzh0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, 9eh6 j o*6ulezmi; o9xwhen 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 in seriy20bloeao37* ,gcj;9qfcsr hes?ocgh39;sqlje7 rf0yo, *2 cba

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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 0b /1uk7hzzrzseries with a 4.7-mF capacitor for a resonant frequencyr1hzz0k ubz7/ of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with 2m sw:02c ;pk *b dz*uwirx/zta 3.7-mH inductor for a resonant frequenud b t :izpx/zs2kr*mc20w;w*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 :r ), bzjveok8be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be :z,ej brov)8k1000 Hz?

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