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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: 游客未登录  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 mau750raoe0 ar pgnetic 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 kt 88j4+l nonz3zq,gd that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops yv5 z,xw6 7lgyof wire in a coil produces what kind of change on the inducey57xgwl6vz, y d $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field t+ :/7bb znxrdthrough a loop of wire produces what kind of change ob+:/ dxrzn7tbn 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 chan9*2xeneumkf f 0pn h7y9*jut +ge on the induced t9u 9 j*+fxhun nme7*f0ky2pe$emf$, 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 fgr7+4y3c+xq-sahjs pr m+ t5 hrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductokw t6mh7p p(l*r will be that which tends to produce which ofpt h7 pwkl(*6m 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 hj* j9fvig35oyh0+sk norizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet +n3f ovhg*jkiy590 js induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heldl so,p6w z*g;qxcvv6or6 z60i above its center with itswic,x ; z6* vg0o 6osr6vl6pqz north 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 magnetic field veckg g,yz 554khjgfjvad n.- ,7btor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as thegnyz,dfgk,5 5 k7gjhb.4-av j 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 tvamavt6tsqh7 ./:9l7 r jjl7lop in a region where the magnetic field vector points straight up. The vhj l/a7l:q76lmv.7 9 jtr astmagnetic 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 horj;cu 97zwp yghrc)(x -izontal 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 tgxyu r;z-9 c7 whpc)j(he induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table co8nh2g4 txm01761 ocnmzyff and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of th7014nxgno1c fof2y6cmh t8m z e 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 thro oowdt(o7 /1uqugh a loop of wire with the north pole entering first. As the north pole ent 7uo(oqd/wot 1ers the wire, the induced current will 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 speed about an anz 7s;of zlb4b*( +fi8ags o1sxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of 4(s 1z 7aobb8os+iz* ;fsf nlgthe 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 rotat0iuz14 gu)ux3t 7vo mied at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poinxuu g4 7mu10i)t3zvio ts 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. mq+tq4 s4cvfr:ll9 x0
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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 thamnrbuc* kf*if-4mt7 ;t 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 hssn+ri/ s*5p)3gbz+. ge, mhn 0lqsufield. 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 direcf90 dvf5htj4 8fj ;hsction) is moved northward at constant velocity through a magnetic field that; j59s8v 4c0fhdtjfhf 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 h nad uwx,.s8fog0:n71 p)wrsciu- ;svelocity $\omega$ 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 generato-oaga .9nk+ g-ts wx0ir 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 fr bp(mdwa dv/. a/ x;lwo,i9 ,fshmg:d3equency of tw(/ im d/. wd3; al, p,vahxsg9mof:dbhe $emf$ 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 det 4mvn8m. c,z.oygn5nvice 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 t3rut*/g,*i m)hs zx tehat

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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 l6,x 4 yjmvmix6oops than the primary coil then itiv m,jx66y4xm 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 primar xq.x+.hh mmit8*r8bp y coil contains more loops than the secondary coil theqbmt+i8 r.hp xh*x. 8mn 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, the power input ipxr-nux 504 rsqohs(w(4m/d

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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 resonasyj0.pugj vd45 ybw ,9nt 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 inductor are connected in series ; 7x(3 di1rh qytj5suqr5rpw5to an ideal battery of constant terminal voltage. At the moment contact is made hiqr5ysrw 1 7rq3ut(5;5 pdxjwith the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cr 1 n8aocjvty2,b)t: zonstant terminal voltage. At the moment contact is made with the battery, th2t tja 1) ,zbony:vr8ce 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 aesg5/7x-m ga knd 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 and resistance c +wf iqcq38dq( ca+m3R 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 arei *.eaj z.un,ghf,2f kswyz, + connected in series to a battery. The time constant for*f yhak.,i jzw.2,nfg se,u+z the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seru8bz7ap( id h2ies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to dd2p8uh7a(zbi ecrease 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 excepth35 )k *hwb0debtz4qv:

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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 supplys6u+bp*f6 /(sfwk tlo . On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. rm(mk 8z+*vzk vrd7vzc7 p :z5 In this circuit, the current*5k rd 8mzvkv z7zpvz: mc(7r+

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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 cin5l tk:*z2mvurcuit changes by what factor when the frequency is triplen:kt lm*52zuvd?

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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 6**owj0 9zuxcmzs6efis doubled, the inductive reactance of tmfwuz*z jo6*s6c 90exhat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indm qa45 a3l-wb,zqc ih+uctive rezwh3, q qb4ic5mla -a+actance 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 cir6euixv 1zh.3:ic vm3 kcuit, the curreh :vki6i3c 3 zx.vmeu1nt

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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 change ggaj -xww7tw z* yg7a/n;1fr0s by what factor when the freque 1a7g0gwxg *y /wj7naf;tr-wz ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appi3ya(2 5*v ;2xjbqguv fzwa.proaches zero, the capacitive reactancebx yq guv;j*2 w(a5a3zfpi. 2v 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 hbieh-f 6gff,58f k; ps/)b7xip pu 2ebetween the voltages of the inductor and capacitor in a RLC series6fpb5h ih, p-/s8e )fg p fu;i2fkexb7 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 ml :(wwf0z l6lej +wp;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 increases if R increasfmusa*cw 5tx( m-a,;mk1wd 7yes. When is thiwut-c1s;,a*5wykxm fdm a7m(s 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 cpm0z3mg/le l5ircuit 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. Th*a h6e 4frc7h23hdvtue impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance t3p8u mvy/etg0h k;l(j0j+h mboth double in an LRC series circuit, the resonant frequenc v(mj;um+8h/ le pj0htty 3g0ky of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance, ;y+v(ks0 ,:o xhir, flfq9xtl

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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 cc*j frb(w/458rhcmdn :apr 1a ircuit 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 is rotating in a uniform magnet j*bgg u*tk1 2p85q1n,odblsdic field of 0.20 T. Find the ma1d l2ugg1*5tp,knb*bqjo8 ds gnetic flux through the loop when the plane of the loop 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 rotating i+nm4 jnwl.c eqlf4d77t-xn u+gusa ,,n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t7,4 uulcj q+.ae,nfswxdm4+n -7tn lghe 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 magn (a9)fm:f owbcetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thcwa)bf: mf9( oe 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 sief+e x5p7 cm:cngle 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 *4i5t 1uz 3bd v*;sdpu6gzcog$4.0 \times 10^{-5} \; Wb$ 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 turn 1 gofb ej)mpz4e2hw)3s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from2f)hbg4w e3)j1pz oem 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 and an area of ey/vd09ix*ai $0.40 \; m^{2}$ 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 aa98 p if;du c3vvpi8,yxf2 ap6rea $0.20 \; m^{2}$ 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 flies horizontally at a location wher -vz 8,0rbywjv2xw*j 8cj.jbbe the downward covcz- wr,xbw8j8.v2y0b bjjj*mponent 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 v2s5 liev dl6 :vz:y2wcelocity of 2.0 rad/s about a vsc2lv wl:26dv 5yi:zeertical 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 and a cross-sectionagw,ls- xy1y8 inp4t*2t9 go mpl 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 wirei5c kashof w79 iv7qfidek9t/d ,-m 1) 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. Eachiy i2jzcnly5m 4f; s79 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 mz; f jnyi4527icls9yuniform 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 1z 7q 8cf 8+iq/esbtwmlxq4o2 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 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 cd2 s30ku3kt- sv jq9ogonstruct a simple AC generator with an output of 12 V maximum when rotated atgdu 0jv2kqkot93 ss3 - 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 ge9bliv -8teg q0nerator 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 6.00 3ahg38l)/7 s eykrwyiW. 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 6.00bru z c4e;b o9i6+ll1y W. The motor operates on 120 V AC, and wheny+6l 19lu;beocbzr 4 i 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 24-V power su.j t,gfl+gzm d78q. 0gcury*jpply. The operating current is 1.0 A. What is the start-up cu.j*.8 qcjfzutlg0 +d7 y,mggrrrent?

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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 i+8qux/7a0 5uflwr f*fx0 f 5l tr.jofis connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is oj8f7a t 0f lfu0.5/fuwlf+x5xri *qrthe 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 co;5kr tkz3w0a 7 eh n;+xhayw6bnnected to a 24-V power supply. The operating k; hzhe 7abkyawr+0n6w 3 x;t5current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is neogyw (rw(/ aghuo/;k ;chy3z ; n/phl+eded 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 fkc jh8dj- -*qkf2w r)klow in the secondary. How many turns are 8rhjq- 2jk *kw)-kcdfin 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 n4s:y+ efdmfem -(:l srecessary in a 110-V primary if the 24-V secondary has 10 :4-dssf(efml mrye+:0 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 pr++jbnfvf f:z bs3ed+8g1udj *imary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cu +j d+* 3ej:vdu1+8bbnzgsff frrent 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% efficienbbnpmto3-h.6c w6r:vxj 6 h2z cy, how many amps at 24 V can flow in the secv2t xhwocb 6z66j:- b3pr. hmnondary?

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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 ml/ oi4e1xe+*6q(q5r ymtoq p neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does q/ o* tem+ 56 qyep4x(qloi1mrthe 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 hsh,m:8y7z.zou(ele wxi .r1ifyf );gas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0, iw81ze7f.zg:him.uosyf)xe lyr ; ( 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 tuuj3 t8(0ny,d pjm mx0erns on its primary coil and 300 turns on its second80p x (j3m 0tjenyumd,ary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its 7f p7g)l l)vfgv5p5cu secondary has 200 turns. If the inputggvful 5))75pcv l7pf current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Ik f7di8(9 je pc;dxz;6sq2pea(gnd 1bf the input volcz96nxe;fq; p d7jg1 a8 2dds (bpi(ketage 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 turns. : dwcs,sbisv nz1 ;ce, ac(1 e7tvb3c: If the power input to thebis w1,v sct aeceb sz :ccv;:7(dn13, primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage a(njt pd5i0aq i64 sn5is 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 dsn ( 5ti5ijqa 46na0pprimary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually c.vl(k)1ly: g( h waiw0 3bpmfstepped up to 4500 V by a transformy.i0)alwkl (gb v3(wmp fh1:cer 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 606)-0onl0k2 yi sf kptd A 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 in the transmission line if t yon l-2 kt6k0sipd)f0he 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 )k*t bxzx1y5rs;1tvk( p 8gbz5ymd4 iresistance 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 lost8b1kys gx5 vm 4)* t(5xib;yzzpd1ktr 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,thgic l c,m+c 06sn2d resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmisstm,cichn2lg0cs,6 d+ ion line, the voltage is stepped 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 line at 1000 V. How much l1whd- .6 3rwua ,aswa eig8nj/p ybx73 .cfe)cess power would be lost if the power were tra-y e36daaui)xhe 7n .fgc/b .ww3c swarjp18, nsmitted 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 genera -,j thjp0 sol/optg(/tor is 440 V at 20 A. It is to be transmitted on a line 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 0o/hj0/jtl -sg(t ,ppo.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. Homcfn+dl+1i nw4g ik ap o):.z1w much energy is stored in the coil'snp .g4kn1izicmwdal1+: +)of magnetic 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 co :wth,yj-x rt5tqwd8q y -aa19ntains a 6.0-W resistor and an 18-H inductor. What is this circuit's time-w ayq9yxa1:r5 8,t-hwt qdjt 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 voltayke-sordsi : x+r70 /ige 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 5c. 1w6 uyk.ssig 5vtaAC 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 outl 4 hf8ky;wu 1gp0tcfo4et. What is the resistance of the lam0h4o1kcup t8g w;fyf 4p?

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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 4c*tjv ,nm310 fex6zu b0ers xpeak current through tbve,ce4ur0 zt jx1 6*fx03 nsmhe 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 tgkm4s sgfc:jls- b15*o a 120-V ac power supply. What is the power dissicsj4bg :sg *5kml- s1fpated 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 resistlbc ;+ll-fvr5or is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist2as8 s i0a-:;xzpe tj/ brx3oek:a k5dor 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 i1+/us nhn p0 eypv8i:ds $I = 0.80 \sin (240 t)$. 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 inwxd ut +gb 5fho sa9md .8c 2+y;o*qm7v+zt-waductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a buv2*lu7wlnv+ xo .f+.r*u9f+nf/jf-wlmtb 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 hav xvop49w k,0rwe 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 n s2ph jd9j5c.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 frequency of 20 kHz i4 ra ty,fz/5lds applied to itdf,5z/ral y 4t?

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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 ducmvby2t :w 4* .8x-xnxugm 0vle 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 capacitor at 1g 6m6qm1ab3oi0o ,get 5tvji10 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 ly.26;v8pezbr 0 qt: an1k,gze6ajpo 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 reo ) ,)j st3edtk f*lo;qjkm*x(actance 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 capacr.qh :c-l)sck) mdwdrm4; z) hitive reactance of a 0.010-mF capacitor be 100 W?mrrc z)wl:q cdhkms ;-h 4d.))

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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 andkf,, (e:p.* p*syfufe6 y v d4f7pt+onrpkq*y 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 resistance, 15.0 W cd1noy2,w(4vshzdvrgw 5 0 iq5y z/5z indrz4qzs5,vg1yz0 hnw y5vd d2i(/o cw 5uctive reactance, 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 impedance at 1500 Hz if a 100-W resistor, 20)zy (zi/2kymrq a/g;q-mH coil, and 1.0-mF capacitor are connectemy/qi/yk) r a2q(g;zzd 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 : ehe(-cs0xeqolnmasf4nm3:*bs y8 /-mH coil, and 1.0-mF capacitor are connected ihslnfo eye0xb/*a-: sqm: 8( c sn43men 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 i j5tntq.mv/* anductor, what is the impedam*j.5 ttn/va qnce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in ser2e m vhwm6f( /d42vlzoies with a 20-mH inductor, what is the phase angl vm zdowhm2/64e v2f(le 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 witfnjhw0 uu65a xb.qf,x 7lp* t i7*5qxrh a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W atrw.f,*q xxhut6f xbnjq i57*upl 57 0a 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 n1;0qd d 8n +s d.cx9oqlker)oreeded in series with a 100-W resistor and 15-mH coil to get a total impedance ofk8o d;0xq.o +d)qn9de rc1rs l 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 ser9hblhn/+md j9d 0,kqc o) k 20etktt(dies with a 450-mH inductor at 5000 Hz for a total impedannl bm9tkq d okkd0, ej9d/+h )2ct0t(hce 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 seriplsws6*w pb47 es with a 100-kW resistor at 1.0-MHz for a total i6bwl7 4 pw*sspmpedance 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 capacitor. Whal vdfvgg-97o- 7vre(i p:4cq: iu kke8t is the impeda 7ekv-:di(p9 4 r: lfig8ec-ouvqgv7knce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor k ns)y,0xt6 g,*t gawnat 1.0 kHz for a total impedancgtw* tsn0kn6ga y),,xe of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fdood/j5kj 6w:bq3zvw5 ,7dlkl,e:lvor a phase angle ,:l7v5 5k3l:ew/ d6dlv zodj, k wbjoqof $40^{\circ}$?

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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 witwm9/ej/e.kcx n h 5c0sh a 30-W resistor at 1.0 kHz for a total im/.50kwmx9cj/e ne csh pedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-m*di p s4kcrkinzs 8..6F capacitor at 120 Hz. What is the phaspsi. kd48n rz6i *c.kse 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,h xde (;kydv)e-0fok 2 20-mH coil, and 1.0-mF capacitor adh)0-(kvk 2xyeeo;d fre 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-mFya;ed ; 0qe8t5dpn2wc 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 th5dca; npq0e d yw;82tee 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 capacitive reactance 30 W, and an kwc3 66hvy73 kz7d*kfj avi /z05alpy0cwtn( inductor of inductive reactance 30 W are connected in sef5aivn7 3hkd 0 tzcj66kw0yw/p3lv( y ac*7kz ries 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 sfj*pm g04)jmn fv6zhog;g5iyy1 .:afor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w46nzmafojg5 ypy :v;)is1f0 gjh.g * mhen 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 nqu w2ceia.c nz+2;24d6 gseo yuy9gk* ecessary in series with a 500-W resistor for a phase angle of y; + wuen 6ck qo.ad*92gzye2u 2cgi4s$40^{\circ}$ 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 fx+h;1m:xk a b38+*km plxgz uzrequency should the circuit be drivex+ukmbz *x1m zg;:a8x3phk+l n in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.:u)d98hl *x q0pnscyp 0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplxyc0)qlp9us: d h p8*ny?

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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 circuitc8 lhex1w)kravf 3 5.q is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 3evo .o,22x ent0 W. What isxvo 2oen ,t.e2 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 50-W resistoflin g6z* frgixj3;/ 3r, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow3fl6xg* jn; ii/rfg3zer 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 8116iygmaxv 9ewi) o+ +i ijhg15-mH coil in series?+ii 6gjw)98 amiy e+oi11hvxg

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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 capacfc9*mkru61 nc itor for a resonant frequency of 10 kH*fknccr 1u 69mz?

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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 d+2:6n-llwr; ryu gmj3.7-mH inductor for a resonant frequenj6uy2lg m:rdwr+ln; -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 be placed in series with a 30-W resistor anrbxnd9e9 ht *.d a 40-mH coil if the resonant frequency of t9.e9dxntr h *bhe circuit is to be 1000 Hz?

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