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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 magnetic 9rk*j f7uq12q-woo +agf 1jth 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 that toz bow;5)-y(gqpdunel -c-1the $emf$ 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 prodx,h 7qeo5 8q,yy: xpdquces what kind of change on theyq,px5h , qoe xdq:y87 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 strengt7q 18b tlso4 gkl9xz2lh of the magnetic field through a loop of wire produces whatlox72 kt41sq98b zll g kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ofdy eysu vl*tng/2k(-ac; /e n9 change on the induced ta sn(cenu;lg v9*k y-yd2 e//$emf$, 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 magcn, fj5pk vut71fpbo ( y;j3;gnetic 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 direc1zs 0(5pg p5qs 4ps8y9k 8 cmys*mockhtion of an induced current in a conductor will be that whkmsc9 mygkpsp 0*c8qz s54y8(15 shopich 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 horizbo 2r;k5(oubvontal table. A bar magnet is held above its center witokru o;2vb5b( h its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizon vwe:;u034t 3akh ophttal table. A bar magnet is held above its center with its norav khh o4;0utt:3pew 3th pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetihm vb6lo+x0 53vwz5 8nltxga )c field vector points straight up. The magnetic field vanishes suddenly. When view03 vtml 86awl5vg+bnz) hxxo5 ed 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 in a region where the magnetic field vectoa67yybdxl m 4xrb 6ys/+sx:r1r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what 6bm1 y7x4/xa+y: dx6yrsr b slis 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 magno qro;,dlx 9+wetic field points straight down. Tr 9,o;d xqlow+he magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tablb,2qwqka u,+pe 1/rrjph e ;j3;kcwe(e and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithk ; a,rprkq+ b2jwpqec ;(/hu,e31 ejwer 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 loopv8p npp:rk qhoyk+ik(2.ti (7 of wire with the north pole entering first. As the north pole enters the wire, the induced current wyn:k (t8r(q2oivpkp 7 hpk+. iill 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 constant angular speee;tiv( x1g a sj*ji;gd3 940i gkbvy3qd about an axis whose direction can be varied;i0ib1ya3gv9i;jd gek v*3t q s(xg4j. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an ai/ ;gylbv ;a:ixis whose direction can be varied. In a region whiia:vlb /;yg; ere 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.7lzvk-( 8l gsi
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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 t hwf+j e unxqgh89:b8g29)aen hat 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. 8j+5yi 4ba . ft4waptla;6g)c :axsgt 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 tt13abnhg6/r in the east-west direction) is moved northward at constant velocity through a magn6h br1/ atgt3netic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular / wedn 58gxgb*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 trm7grmzr-gx px 1;sb/+ ansforms

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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 second0cl 9 h14jru mxq(kw/h rsu+,p. The frequency of therm(ps9h01x ckrh +uu qj4l/,w $emf$ 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 use10p9orn 8wf;i-wh6b c 2akbdg1 af b.qd 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 deviceibyx -umsxw/4g2ok+0 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 l3:kjx94-+/a *eoyppk iy qr uprimary coil then it ioaxjp 3/u- ypk r+:9 eil*4kqys 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 secondiq bqam+ :mcshgj/zi dp(4gf 9/w+(2f ary coil then it is+bgw miqs9+jap/ 4(zmcf h f:dg2(/qi 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, th -/cl(+f wmmade 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 resonan,odo4,hvmuz64 up( wo t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induct* gv .m5ame,snq 0,tiuor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, . aqgevm ,5n,um*ist0the 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 ind n;l9a0y+x ucbuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact i9+caby;l0 x nus made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tow(.oxk/*/x,x qoefzrgzvo 6 aj-1tm* 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 inductan+ubik sb7c.: 6h/-bn+b asr5b ul h+nqce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The 9i( .yvin4tax time constant for the circuit represents the time required for t 9at xi.y(vn4ihe current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The56f* b n/zsb5b0cdyblw -v(z n battery is suddenly removed from the circuit. The time con /-n5zdy b l5wf6bn zbb(cv0*sstant 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 same unix k) k;10spqyzts 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. On this circuit, the ca1cz*v w(f) shncsynxj) z80/)qoo j7urrent

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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 suppxt.ee . bjg;gw3 -l1vqly. In this circuit, the current wb-j;.lt e 1qg3gex.v

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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 y( 55w/cuaknld82uwzq : e0t zwhen the frequency is tripled?nzt0la8:5(wu/z ek cdyu2 qw5

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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 is48 ijr ,dp/ro63eqxtm bg0u.w doubled, the inductive rea dij6mqr04o,rb /u8w3 g etx.pctance 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 approac8 r8i++go9 d*fhf rkymhes zero, the inductive reactance of tha8ogfmkd*rh9 8fr + yi+t 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 tokdnzi(l0 ,(n3bqm ho /.3fm qy an AC power supply. In this circuit, the currenbz ,i(d/kqlmfn.3 q30n (omhy t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what faqgtlwpj4hs2( 1mvu+x, s 78rfctor when the frequency is trigms(,4whsl p7t1r 8vxu2 j qf+pled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capac4qzj9 /+ cwmelitive reactance of that capacitm4w 9l/cz qj+eor

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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 inducz*0c h+rfc,hjuik 65qtor and capacitor in a RLC jhzrhc*f+6u c k50qi,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 defined asu frkw.4.sv*,pdj.g-u wra e 6 $\cos M = R/Z$, 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 increases if R 3 j+lw*ivci7a7- rdtln*hs:iincreases. Whenit i -hv:73l sdjlw *r+aicn*7 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 cir edbb.n +hrw9)cuit 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 impedg3;s/ f4xx3cws fy 3mzt(t 2awance 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 in an LRC sebe9g,a6*(cngqo k e o2ries circuit, the r*c2( kaegog,b6qo9neesonant frequency 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 ),u2z kj /nercthat 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 circuit octxc9if-kx 1 i+curs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotat l/ pj1skq mb(8+6p:uzl-jkkrm9 :jh wing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo lr(z 68sm+k1bw9 mj:jpk/j l:qpku- hp and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is roat/0e a(ypd9w wjd: m)tating in a uniform magnetic field of 0.20 T. Find the magnetic flux throuy 9w0a)/tdwe(jmp:d agh 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 magnetidre :e-)qeak .)ldkj 5c field of 0.20 T. Find the magnetic flux th:a elj-5.dk)e)derqkrough 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 acz( vjk,bnu5) n adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes3v myl+mjinh,y7f g)baq ;t: - 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 2o 9ou4 flfp;l+00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is 9fpo;4 flluo+applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 andzv8iy2 rqy: ha4y6/21)peo lk vxy9a z 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 arei 07rady o(4oea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fliij5sb* bch8)j es horizontally at a location where the downward component of the Earthjscij5)h * 8bb'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 cf -0dqejpf)r1 onstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while qej)d0rp-1ff 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 50k88.eazytu) rpb yg5 g m2u:;a 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 t)jaj,ay-.j g. 2ch*:mylhkps-v agj9urns 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 f;( dgk /:yv fnh,+chlk j*lj*d:jqu4 loops 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 of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of v l: ;f(d kqhjckyfn*:d/*ul+ g,jj4 hthis 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 of9w1 do0 kj 2veyq2rcfsfj)- 8v area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with atx1z2lm l040kq0ku3 qqac i)i n output of 12 V maximum l) q1m0xck u3tiq4q0zlia0k 2when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatord6r7y6tam (nf-1-;b,j fgv- kdy bv vi with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6 ,/ t/t; xl 5ay,dmq4oe:xbcwu.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 resistankob5uy fwc:l z5 hall:z5,0g9ce of 6.00 W. The motor operates on 120 V AC, and when running at ,a l:5czk5gybw9 fl ohzl 50u: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 pv+fzf9i4iwq8 *p:sv*;l( kc. ffi d lconnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cfvfi(8lkql +ii:* fdpv spf*94; zc .wurrent?

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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 resprq.t3pje 296 (ir yzub1 9deristance 6.0 W is connected to a 24-V power supply. The operating current i9r 6ypi(1 .zr2qjrtb3e9pu de s 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 -z1t3k o xad9zto a 24-V power supply. The operating current is 1.0 3o-tka x9dz1zA 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 needer n7vme i0wngzlvv4)4w;6c -qb9c3kvd 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 flow i:zwb u)0l rv5on the secondary. How many turns are in th)0:uvb wlor5ze 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 neces5sdgnl,krb8 4s*bci-o1wly e93lt3 ssary in a 110-V primary if the 24-V secondary n31l3 b dk 8ll -,ossy9*4sge5i tbwcrhas 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-turnit3n48q 6r:b e+ khozp primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what itp6bre3n +ko4z:qh 8is 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 6lk89z 0qq*oag5( m6brzi gef of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in*gz09r6i6gq zfa beq(ml8 ok5 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 transforme yzlepa hm 9ks8f;9/bnu)/m7vr provides 7500 V at 10.0 mA. The primary coil/ )vh7umk;smb f eyap9 8ln9/z operates on 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 primary coil and 300 turnzyot/ btmb r+ri9g3 ,5s on its secondary coil. If 120 V at 2.0 A is applied to the primary,5gtb i3orr , yt+m/b9z what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its y ;z 1chrk1som:r 1ugsr ,hx6h9(mz9xprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedru1:9 m11x sh(rgrh 6my9,kzszco ;hx 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 izpay c2zoj- s(oo*38ats secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the s a8sza-o cp32(yo*jozecondary 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 transof(x5j)t9r6ou6s 0u p4uj8ur2 fnrqa former has 100 turns and its secondary has 200 turns. If the input vola9) u 6jnruof85 4sxp6q0truruj( 2oftage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu r)koaf3i,fx.rns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negl r3fo.kf), xaiecting 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 22 fsp 15aathqcurrent 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 number of turns in the secondary if the primary has 200 turns.1 a t25qhspf2a

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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 steppb)b(2j gltw ,wed up to 4500 V by a transfojg(b)ww bt2 ,lrmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost 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 120 V. The voltage is usually stephy g.ai yhm*8 d6ma;t-ped up to 4500 V by a transformer and transmitted through a power line m;m*g .8t 6ahyadyhi- of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission oocgy)y vo;i*2.p(y mline 50 km long has a total resistance of 0.60 W. A generator pryyi cpoyv;.2 o*()gmo oduces 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 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 liiv5x pnu*l6: hne 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 stepp*h n6v 5pui:lxed up with 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 lina6u /4qf7ryc oe at 1000 V. How much less power would be lost if the power were transmitted at /cy6 ur7a4fqo3000 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 line 6yusamim4l )o n(oo8- with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original powy6-u 4s aoomi( l8)nmoer?

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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 carrieee)qc ny *xoaqne-gp8)g g56 b tq/m((gf x7)us a current of 5.0 A. How much energy is stored in the coil's meq*)y/)tgnubexnp6g 7()8g5(om ceaf - xg qqagnetic 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 1qkk8qt cm(qos2 p88 b4rt j3wand an 18-H inductor. What is thist1b8t4mq wkc83rqo( sq82 pjk circuit'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 volwfotyjv rq pg-7k/ n.;hy60 /itage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the per6d v swn)q48uak 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 placeb0us/l ;z uzdxfb ry)b;+ rkz(kj2v.2d into a 120-V AC outlet. What is the resistance of the lam;zs (r0u kbfy;uzd2r)xk b./z2vj +lb p?

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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 curpszu81//:kspntox;wh n d, am4a0k os8 dh *5grent through th , /s80n: hnkops/s;zohdug8x*1md a45wa tp ke 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 supfz1j 48 mg3yrx1 2rxcxply. What is the power dissipatedjzgx1xr x2r3 8fmcy1 4 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-W resistor iz:k hua.2 .clxi+ 4i,grgg0lps $I = 0.80 \sin (240 t)$. 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 u(fxtr8j7 zi23a o1qqcfo 0,k3 6oz8a( suzgdresistor 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 re. zsi4f+r9bo lsistor 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 atib (rrya;-e 2r.ct4ohx ;gyf* 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a i -.hve cs;2mpu 7uwq10g zsw92.50-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 12men ;*ai/nuq 4.0 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 nek v)ts +e h sf51th3f5s19rocpcessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freque,jx0p l,v;pk jncy of 20 kHz is applix;,0pkjpv jl, ed 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 throuz plug 4onglt29tl ) (lfv3*4ygh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4(8f bgoiurvu3*d8 g vjivdz(ha6+mp ;2v/+ sf.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHhg) 4)n/lmf1rcyb k r5z?

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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 hayovtds 8etil3a(d95; ve 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 0.010m)w9 ;g iij,n y1 hk20i9lncmgro3( wa-mF capacitor be 100 Wi12oc an3y in9wg)kgj;mml9r(0 i ,hw?

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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 capacit/6 k7z(:zf)nazpt. 6zree gd ror 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 a3-k j+sw klnb i) 2it/go5rvi4n ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c4-s 5vi bg)i2lok3 jr+/inktwapacitive 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 x9 4hdy.xwpy /d:sr0f at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor axyw4 y.p0dhx /rf9d:s re 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, m pxr:f99 dj+d*6mlq9;jomhr and 1.0-mF capacitor aremdf *9; ormp+9q9:lxjjh6 mrd 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 connected in series with a 20-mH inductor, whx a*,cwthe3t 7:/sip1 2ipn yx(fts5nat is the impedance at 1000 2 t ft/ 7wxtx,p1ane:ssy pi5n(ih3* cHz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thg3m(ege(-prsj+ z5vf 4 os**x iucs7je phase angle at 1003f(-s5z4j s+ xi(gcvo jp*s*r uge7m e0 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 kpsst co d(2/*with a 20-mH coil and 1.0-mF capacitor for a total impedance ods/tspo 2 (k*cf 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 with a 100-W resistomu-i2+ coopb,**gflpogb9 -cc 3zk2d r and*ico9oop g+3gbuk* -zdpm 2l 2c-fb ,c 15-mH coil 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 a7l j16x q6bymj evxg59vl5h5x total impedanc5m 1 lhgvvj jx qle7669b5xy5xe 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 at 1.mi-)3ew tsy(a4c ra+w 0-MHz for a total impedance of 15ysa)m-aic4+(wtr 3 ew 0 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 caa4p:/ disq(popacitor. What is the impedance at 1000ppi ods:4(aq/ 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-mFrw6yvrgxj )/i8hrh*w 3wd.l 5/uh8nf5zki .r capacitor at 1.0 kHz for a total impedance of 4 v. rzu 6wdjr/whh3yihg xf*5r5r8.)kl w/n8i5 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phasg -),vnqwuu x)e angle o-g )uuvwx q,)nf $40^{\circ}$?

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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 +d itwaee940efor a total impe90 atwe ed+ie4dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 1)jl4z4 f9tk e-qwj7ne20 Hz. What is the phase aeteq7j4 zf94 l-jkw)nngle?

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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 as9ke*1z yq 2 / -0rzrjvugvq+end 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aj ksg yr +vz*-quvq/e90r1ez2re connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-)gtjg.x4lap gemy1-3 is )t3cmF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powxmj13gi3p4 ) .c) gls- yetgtaer 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: 340g ;wa lctw.jirve capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to i :wrj ea;tlgwv 340c.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 circuit containing a 50-W resist(6ik/7 k) rais.zey-ktb ,opyor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-H7rk.k it) i-by/ozs ,e6 yk(apz 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:( . *j3lpgyqlk9x0jnp9n igq in series with a 500-W resistor for a phase angle onnqpkx. g9l (p 9 y0jl:q3*gijf $40^{\circ}$ 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 lk(-hblrs rku+j; 8shbvgc );vx0n )tu1,2eoW, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from rs 281vb k0-n)lrvjul+scx e; hhto(u gb ,;)kthe driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 152c;)gg79k (y :muu hl2hs pf2 cohvp-wyfa-4t.0 W inductive reactance, and 10.04f7puac-p:ml () o9 sh cfw2 y;t2 2hyvhgguk- 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 circuit is x6e( zvczlfc83 lu k(r0gk8/k$63^{\circ}$. 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 im-j)y((e sclf ktr+(czs i;yas a 00j6lpedance of 60 W and a resistance of 30 W. What is therac;6(0c ak i 0zjlself s((-+tsy jy) 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 50-W raczy5ohl+) lxq *8:muxgn3)fesistor, a 10-mF capacitogzyxl)5aohxl3) * c:f8u+mqnr, and a 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 1.0-mF capacitor and a 15-mH coisr,ppv mky18gg/132hdk nr 0sl in series?rmd13k sp vg02p8h/1nrgk,sy

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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 in1 .inzhu;v/bn3z m/n s series with a 4.7-mF capacitor for a resonant frequency z/bs zn1;i ./unvhm3n 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 a 3.7-pf7j ouu-bca3g hfyj3(8ekc5ef/. c(mH inductor for a resonant frequency of 1000 .pj-yc/e7fckc(e af3 ( g58jh3u f obuHz?

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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 k(k ;ybqnstl-; za epu ks:v*:u am329series with a 30-W resistor and a 40-mH coil if the resonant frequeuay9zklstam :*-kvsb(kq3un2 : pe; ;ncy of the circuit is to be 1000 Hz?

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