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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 magnetip6l cdfuc(7z c a2y( /k29ugdsyti f70c 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 i 1:kj z.wy jb9ce5k3ithat 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:fsg 5f9h f3jb what kind of change on tb :3s95fffhgj he induced $emf$, 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 maca gj2kui7ixdc) ,/ 0tgnetic field through a loop of wire produces what kind of change t u0)g2k 7xdi cacij/,on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on *7wsir x 4*tvathe induced 7 **t4wxs vrai$emf$, 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 magny2 6-1fqshtztetic 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 h ,5mh67,eu5gcegsov cm gc7j3h :/qzlaw, the direction of an induced current in a conductor will be that which tends to puh ,6c75ghcg3vzgj/s q,e e7o mh5 :mcroduce 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 hhq7rv ((gynw7orizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (w7vh y 7wqg(nr(hen 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 2vpruaa+ugp7 i )pm 6-table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet i vur2 imgu6)p+-a p7apnduces (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 tajdvj;6l /nn(f h (nwh ;svs;w-ble top in a region where the magnetic field vector points st; nhj/w(hw;(njn lf-svs; v d6raight 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 tabl. i,7r wctydcjv2f o r+e(s8g)e top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above.degrs ywf o t)i+8 j(rc,27cv, 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 hq3kc1y*/ fi ax f8lqvio )op40orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disapq lf0vk83 c /i4qy) ipxaof1o*pears?

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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-increasiyqjzjl h pd+z 2 :b:;.f1l/pljng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from/1q bydljf; p2jhj l+l: zz:p. 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 the north pole ent9fx-auun*1acv u p o1)ering first. As the north pole enters the wire, the induced current will be (as viewedn1afu9c)pav1 o - uu*x 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 constant an +trr46nh0br cgular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dorcrht0 4n6 r+bwn, 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 at9twzcna -z f,( sfgt:wr8az9 5 constant angular speed about an axis whose direction can be varied. In a region w,:nz rg9zs-z( tc a98 f5twfawhere 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.3m:t al0jh-ix c:;wo e
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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 yscd2rc19p 08a5 m ulkan $emf$ 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 magnet4kav s))qng 2 )umw,qeic 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-wt:a h eu+pe9m3est direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentia 9 :t+epeamuh3l induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angulard- ezm6 e)im/h 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 tram788 q;b n3cj5hp* ei; dwbvounsforms

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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. n9,6b+ vl:s+ d (0 weyqietnbp The frequency of the tnqvy iepb 0w:d,6+ (+nls9be$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device usexu i;i6 g/w.uvd 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 dev 6+qgc/x 1zde3 phi/bmice 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 primah :.o5cdk2 ssbry coil then it d o2sbhk:.cs5 is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than thew2 g+ail2sns qb4j1 9a secondary coil t sw9aa21js i blg+4qn2hen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th9btp 7i94bv59 fvk m-caf2f0ektue +oe power 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 circuity 8pl u504rgr2mhc3ud /crx7 r,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an id+)esli5le dh z2yoo,3 eal battery of constant tlohzeye3d,sl+ i) 2o 5erminal 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 inducto +i4g z(qh)cclr are connected in series to an ideal battery of constant termilzcgchi4) q +(nal voltage. At the moment 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 resista977nn7n1+wdu6 ek,czzpl4 sdoy2c ni nce 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 and mwafsv/3(v e *resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to c*qwkd 1m24/ vmejuwl uy:2d v3zn9f5a battery. The time constant for the circuit represents the timejmd4m9/ v1uwevw35zdc:*l fu 2 q k2ny 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 qhfv 4 l /5kmuz0t,-ugmh84e pconnected in series to a battery. The battery is suddenly removed from the8z-m0 u4khut qm,g/l54fevhp circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sam0g;ssfg+ *9 yd/oftkyqjaq1- e 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 z/1a8t w adpros/p 4e)an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC e3caxasy0 3 74dkq9g fpower supply. In this circuit, the current3gc 4da97yek 0f 3qsax

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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 circuitp 47dwn5z h+oi changes by what factor when the frequency ii 5opd4w7+nhz s 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 a ivyka/c/sj6/) ;*mqu dnli)fg cq6 l6n inductor is doubled, the inductive reactance of that inducqd6y/i alkn;icq 6u)vm)/6f/sjg* l ctor

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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 zer/0 xqlw a7)ynzo, the inducqa0xlzn)/yw 7 tive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cup ad0p4g4 m:pgrrent40dgp4 :a gppm

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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 6z n6 dbd1q(gichanges by what factor when the frequency ig n6dz(61 bqids tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage :gjq/7 y wv f7zhc1p1 - vjjxec 8;c0i;t2wjcdacross a capacitor approaches zero, the capacx ;wtf:qgy/7c pci7 1dv e-v2081jc jcjjwz;h itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induct +soos+ wj +rddbj0e ak4 ;lre 0dxx65k;fh1m7or and capacitor in a RLC s rhdowsb0adk+r +0jf71 jx+ kem;5s4ox;lde6 eries 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 defined oqt+f kirem2vjvrw)10 : x6g2os( pi0as $\cos M = R/Z$, 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 cir:ekmd-w r0+ zecuit increases if R increases. e kderwz+:0-mWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incaz 97/co zi;wyreases 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 impedak-c 6tp(ifa , hh+mskx : ;0hk)bof*dpnce 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 both double iny)8bz6 mly u5;flbwd2 an LRC series circuit, the resonant frl;2)lbw8dm y fy6z5u bequency 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 a4 r(kfs k-.ktdxnx6l 4n 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 rez.bnnbo jor 2l/cvf*vf :/3 3x e:0xRLC 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 rad c0j fgd7 f,+hco7.rv+01jjvs5p gd fgius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi 7g5,0j 01+pfgog7vdfh. jfd j cvrs+celd vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform yb;i9 (ok;*ziq,li ,uw*lf rtmagnetic field of 0.20 T. Find the magnetic flux through*i,k z;(q*lutii;wo rl y9f,b the 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 field of 0.9h8 kcu01agot7dw 7l i20 T. ikgdu o8l7t0c9w1h7 a 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 adjustablnj4o: 1c :ezxce 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 changes from *aksm oy 4ck;3r k..o0wqbtna4he.j)$4.0 \times 10^{-5} \; Wb$ 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 fu,nh :egn .5 oz2cri0wrame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, firc0ih e5g, o 2nw.nu:znd the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and ani18g wnexse:+r 1 -s cj*nhlj, 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 arg f*r)-wtirdfi,z;k; y)(s ckea $0.20 \; m^{2}$ 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 spa10-5ntjv so58caxc 1 ic)tbl on of 60 m flies horizontally at a location where the downward component of the Earth's magnet1vt)a o0b5c58 ijos- ncx1lctic 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 j0/i3 l0u4g eifhdtq41 pcq;g angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant ma4gc/4ldh qgtiep0 3; iu1jqf0gnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a croor,wn*3s w-rpss-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 wr jm6 e0ubmkt1c/y;/3t c lgo-ire 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. *nwv/p ce9)y2 pe2-f1 ngyb)qqzu:cuEach 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 yn* p weuc2qu2fq 9b )gz1 )v:-ny/cepa 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 turns of wirmu,x/:e(ou :p okym7xz+ xh fdm/ 9ft3e 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 construlq fqd 9fsk;,-ct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0d9 f ;l,ksqf-q.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 maximuq8wsp7(x iniv be e:;4v1 d/qnm $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates0w2f2y kowa: cf zzq) cn1uu,/ 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 motorxb.xn:85*01nd o7ibnrzc aok operates on 120 V AC, anzxo0k5 r* bcn x:817no dib.and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 241ppm7/6,jtmi- ie xjm -V power supply. The operating current is 1.0 A itj-1mi/ ,pxjm pm76e. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplbwz8o* jaaf,r9 w0w. jm:j db2y. The operating current is 1.0 A at full speed. What, 0a2mb 9a: oj8zdww jjb*rwf. 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 connecnp)gtccxel8 ,3.ltif8j5mo 7 ted to a 24-V power supply. The operating current is 1.0 A at full speed. W 8o.7tijg enxml3,c t)8cfp5lhat 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 transfor.i/ ape7koko h0g*s,fmer is needed 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 causebno 53 fgi4qp;s 14 A to flow in the secondary. How many turns a g 5ofp;bi43qnre in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primaryex,6n ;z oql8p if the 24-V secondzl8 n pqx;6oe,ary 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 207t rhgk*9d;/r,qs usi1*j rsw00-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primar*s r 9qs1skd uh;rtgji,/w7*ry?

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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% effici 9oiw3,w -6 nomb7kqnqnlgy y3*apw+,ency, how many amps at 24 V can flow in the seco o6k ,wnmnia y ,+n9b7w*g3-l 3qowyqpndary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 m m ufisupgvxc /g4c,;7 ip09.uv y8f/xA. The primary coil operates oni 9 4f8,y/u ux /cm ;cv70u.ggvxpfisp 120 V. What does 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 xefj e/r m7qgnc(7 4p+primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presj(ge/nqf e +4x cpr77ment 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 turns7xalp k; :5c+v imja06blwc.f on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in th.p+k aa;vlim6 wjl57c0 bc:xfe secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turh7 n)d3cx*dns (s f w*(z4rbdkns. If the input current at the primary irxnkd3sdf(h)b w csd74*( z n*s 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 transf .j+no9fp,mqptr )dz7ormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can9),ftd zqprjo .7p+mn expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsg upspx1ev k ,h1)d/p3. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional loss epgv1)/uhspk p13,d xes)

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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 currb mweughcks2,he+*5+ent 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 numbek+bhe2h*,egcusm + 5wr 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 volt(4c7a6qc+ocpkz 6d l;. nxe duage 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 lo;pn d4a. 667 xklucdceqz+c( ost 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 udqup1q/zg.n n; ul:j m10*l5xh;sls of current 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 insn1.plx:hqzj;squ m 5gd* 01/ull nu ; 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 liqw ;d2e2gnxfaylpry8- n6 r*+ne 50 km 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 with a transformer with a turns ratio of 100:1. What percentage of the original energy would be losq*pfd;+ywrlx er-nn g68a2y2 t 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 cye+)q e2k y2p50 km 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 with a transformer with a turns ratio of k)cey +2e2ypq 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 bw+m p yezij5,-tor1y,5dtt, less power would be lost if the d 5o+ezj 5-br yi,1,twttm y,ppower were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440.q nkjh+o( 2zj V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the gj.znhqj 2 +(koenerator 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 advr g-47q3/to al hblwug64 o7 current of 5.0 A. How much energy is stored in the coil's magnetu6/7q llvo3owh 4a4rgb d7g t-ic 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 resiss,vptz1c+jd 1fca q.cg :g3g5tor and an 18-H inductor. What is this circuit's time const, gtad+:cg 1fcj1s3 zpqcvg5.ant?

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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 wher4ci,+ 6p d; ydwut9mpmpbbc 7.m/j(ize 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 inaj3 v27ji 64 +dz uwq kvjk3w;vpq6f5xto 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. Wk ikciaz8 ku+lw--)p 4hat is the resistance of the lamp?p4kiu wi )-lc+a8- kkz

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak -/,9fe .ox1tdh; b gdshoe7br current throurbdf9o s d.hh,tgeoe1/ b7;x-gh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t0o :oop-dlp8v5lr)7iu5 mkdbhe power dissipat55mdiv7-ol)rp o0ul8 o :bpkded in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50+:g,h5amwview (o*y awz6i * t-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 s4fx2i.4w hra a 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ivm3:/ f lj).-voktx mns $I = 0.80 \sin (240 t)$. 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 hwxz3ujqc+ gi,-)qved, (v i n-+ytx, 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 reacta wjaau(7+xd b)w+fw8nnce 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 w1/nbuab1e a:rv 4of ch:.m z/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 157 W of inductive react .wml:a la iq2isr-(:/rvn:jsd2l 9klance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor whqlb- m1kf6mbwe* :tgxu3 qfi0x*/va +en 120 V AC at a frequency of 20 kHz is applied tovifq lfq/mtu g3 a:wek0-x+x*1*6bb m 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 fxxir7ejv+9; 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 4qb5pgi v2wdq:,k)+ kn.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed9v 7y ):wr1s iyi0bhp 5i;iala to 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-mF capacitor have a reactance of 1s7svp9sd7t -qz g 0c/a200 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 theq2nt/jbln4 +j n :/riz capacitive reactance of a 0.010-mF capacitor be 100 W +z:/jjnbqnnr2 t4l/i ?

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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 througheng2dfl6 ujoty d045umc0 -6o a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanzg.ie)cdk39 v*ye7k(;f b;g yvuwex , ce, 15.0 W inductive reactance, and 10.0 W capacitiiv73 kg(;ceyk b .d;x f9)*uewv,e gzyve 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 100t: nne7 -f :(n+fb1q clpiul3a-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serl q-be:pn:ufc3a1+ (lti7nfn ies?

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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 1500ccgx;dniy 8sovc -7z( fx,/z7 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i;zvx/ (cfd,s7 ox c 7icgny8-zn series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in)s-y3 ify/b ( dw5:tmddt cl.bductor, what is the impedance at 10 (yfl bywt35dtimd/ :d)-cs b.00 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 conneradu3pho *ldqh,764gx(:o*vfue- lu cted in series with a 20-mH inductor, what is the phase angle h( xq3r *7uuo:l,ahddu gvol- e46fp*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 circuit with a 20-mH coil and 1.0-mF 9zftz, ni )fa/lwzr )xa0,2mwcapacitormz a)zr)/f0it 9wwlaz2 x,,nf for a total impedance 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 in series*9s4 l xhlyid0z-*zib with a 100-W resistor and 15-mH coil to get a total impeid*bihsl zl*x-04 9z ydance 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 gpf/3 ix vj(v+/ v.bf qtomzd 5,(yaon.fu/b4a 450-mH inductor at 5000 Hz for a total impedoa v f.5 jv(bf(y,pvn /f+x/ g3ud4.mqzo/t biance 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 resistor at5 9vf-ovfc y 43yn cf)97pcfvg 1.0-MHz for a total vnc5497g) fvfv-cyf3oyf 9pc impedance 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 capacitorvob+usy 6 gdbj* snuqy m2hwu; (,s-//q7yf1u. What is the impedance at 1000 2sq7g*+;yv s/hmdub,w6(fnyuu /j-yuqo 1bs 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 capc df)ki ii6z02 0qezg0acitor at 1.0 kHz for a total impedance of 45 Wdg26ii) 0z0 qi ecfzk0?

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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 ksm yex-30gn*q d.q 4zhHz for a phase angle gzy3hs q*.enq0xm d4- 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 z qja 7ny+o4e)at 1.0 kHz for a total4 nje+qz a7yo) impedance 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-zg*0+ 9w :u/jd 3chhd 6nmi vzm(win6dmF capacitor at 120 Hz. What is the phasvddn (u jw6 ighinc hz3*m90/m6dw+:z e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, a y( bdcug-xb 2ve3)ci(nd 1.0(y )-c3ic 2(dbuvbgx e-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of alm2;08cb3u plyg5bdt v+sf *g 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cit 0s2ggcfl3p8;+l b dmbvu5*yrcuit?

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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 capagws0 l epy7;v2vjc6 z8citive reactance 30 W, and an inductor of inductive reactance 2y7 vzp6s; lv 8ce0wjg30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC ciwh bdu sly 1c5xa .cp(i-k)47qrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplkqc.x pac( i1s h7l4ubwyd-5) y?

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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- a xmzw4u:uosvdk 2il4 6k fkvc-7y:: for a phase angle o vi:ak: x6d 4w2:zufyl 7-vkku4oc-sm f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freqr(bdcb1 nhz; +uency should the circuit be driven in order to have maxi h(;1znd rbbc+mum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.g l;zeq k-g+ (n+ctn6t : :isbmw69bmh0 W resistance, 15.0 W inductive reactanceizhb6nt +mgc tm:(;-q+e6bslk: wn 9g, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC 6(ya q v-hm/vcflft3b6zwe - 4circuit 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 7m *qhifr::9;8nb uoy)kpcp j an impedance of 60 W and a resistance of 30 W. What isc7 m98upp o:*iynj;k:bq rfh) the 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 5ehjyju x25 mm5q70y u,0-W resistor, a 10-mF capacitor, and a,jyyqm 2e 5 u0u7xjmh5 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1gkl i3,sxky : *l(vd(q.0-mF capacitor and a 15-mH coil in series?l3( sixkgl*q:v, (ykd

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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 cape)rl 6euhcb.j a.4hu6 acitor for a resonant frequency of 10 kh6jac.4 e re uh)ub6.lHz?

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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 forpjy5c j+2msf/ gcj 3+p a resonant frequenc+3mc j sgp+p/fc 5j2yjy 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 bb34 )/notjrzee placed in series with a 30-W resistor and a 40-mH coil if rj/z 43tboe)nthe resonant frequency of the circuit is to be 1000 Hz?

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