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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 o7uqru*d70 wudnq: (xcf magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statltt1i g+5 k*6crd tpq2t,rbrh5 /a3aaes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire (tv j/ krt+1:pk4bjn25elfnmin a coil produces what kind of change on the jntt p15k2(4lefm nb v:k j/r+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 mag /5:p80mjykipqzmu *e netic field through a loop of wire produces whatj p :e/pzki5y qm*um80 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 of change on t;g9; 9bzw8brydtors 3he induced3 89g;rb tosyrwb9 z;d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an phl.z-jmo43 2f( 0q3 czwypy y$emf$ 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 dia 5bj.u tyex78lvd- 7vrection of an induced current in a conductor will be that which tends to produce whicdu7a-j 5 vbyl.7ev 8txh 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 horizontal table. A bar magnet is hea7v(:g6zo 1w mjca,em ld above its center with its north pole pointing down. The stationary magnet induces (whe v(mew6cz ,jama:g7o1 n viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above:wo (f xy-pkm+ its center with its north pole pointing down, and released. As it approacy+-mwo f(p :xkhes 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 regiokv0x aj0+a i5;jjpx rn 54tn)pn where the magnetic field vector points straight up. The magnetic field vanishes sudde5r xat5njpnj4 ) ;0p+kaij0xvnly. 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 table top in a region wh oldupj1h1e x-yt ;+x-ere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewt d+y h-;plx1 xeouj-1ed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field rwlw/t7 uj).n1 vdx5x3 jbi1hpoints straight down. The ma/xx)jw1 jdhwl 5 3n7tbrv1iu.gnetic 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 table and carries an ever-increasingb *4l) *g0:jt 2 ,dpzqjj.zzwam2xvii curxaztd)gjz lwz2b2ji4:v, im. qp **0jrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nory:on2u 4s1b0 u k- /vbxifyo)lth pole entering first. As the north pole eof/ ux-:lyv)ibyb s20 4ok1 unnters 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 axisf*g.( ojy+wsxxvf00k 48ktk -y 5 brqs whose direction can be varied. In a region where a uniform magnetic field points straight doky q0-trg *jwv5( x04f8 kos.+sbkfyxwn, 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 rotatecba;za nnx,4h kh-ll71e l m)4d at constant angular speed about an axis whose direction can be varied. In a region where a uniform l4)1x ,lcabe4hakh -nznm;l7magnetic 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.gzh ++n1xry zhthaa ,(f*/kxq*w(q1 c
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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 an - /jd:vs4ocdw a* mwq($emf$ 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 magnetico 3 .uc-;kz(n 8kpveyq 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-we +e rkypwuw)70st direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrossy0pk7w rweu +) 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 velocityxy0 +gq9mirq a5l.: rk $\omega$ 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 transfodv7h u7pkow kc4s3se8. q)xnoqy3;q ;rms

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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 thl-,sqg .r yfaj/ nd:(drough 60 revolutions each second. The frequency of the g / nsl,rd-dy f.qja(:$emf$ 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 de)e ,9+jems qmwnig7h*vice 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 de7n*6 2qys9ltfxyiox1xk xn95h e1(d l vice 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 l1sb+- urb :wpdoops than the primary coil then it ib +1 rdw-pus:bs 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 7px.+: ykakc7s xg8rithe secondary coil then i +gcsa7k 7yxrix. p8:kt 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 powd73r2, nqz2ekf( mda yer 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 circ61.4+r pdd tml 3jiawxuit,

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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 bq.-.u,c u8mo -bze juto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the rub.qemcu8uo- z., j- besistor 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 cons ubcc0a7- 4 0q/o.tskkar uo:gtant terminal voltage. At the moment contact is madecu 7gusq:0oa0t ro akk-/b .c4 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 to a ;lcllqek-):t* r)nb 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 indk2fyrx2 2a6l zbiq4;vuctance 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 ll8s-;u/l2+sqhw qztuh77ar to a battery. The time constant for the circuit represents the time required for the cu 7;luths-ah2 zl s/87ulqr+ wqrrent 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 conn,+r -1q59wy numjr 5ccd-.kpuz t7cxnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circui,q1u9czm 5p.cw+r jr5t 7kn --xu ydcnt 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 sam)dc 6 a-numgq52.tin8dj6 more units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thfo89ga kj7 q/ j;v4uh eguf6b5is 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. In this cirm0vwebck7 )i 1ke u-j8cuit, the current70 ki-e1ebmu8j )kcvw

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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 whk s7utu- 7 :3zrkifi.ten the frequencyt 7f-.k:u rk3si7u izt is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the ing5 qb2cleu1* aductive bc *a 5que1g2lreactance 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 anrju f4p85o7x j inductor approaches zero, the inductive reactanc584f 7 jurpxjoe 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 cd 40,zgixuc f+onnected to an AC power supply. In this circuit, the curre+z0 udi 4,xcfgnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactan0e -q2g*cmu sqp)4 nfjbk j:m-ce in an ac circuit changes by what factor when the frequency is tripled?kjfnpg2cq0qm )-s4j: ueb *m-

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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, tb k wdjm(o);n9he capacitw; nd j)(9bkmoive 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 angl ufkr9h ry-yd8 p:h4g.e between the voltages of the inductor and capacitor in a RLC series cir8rp.r yfydug- h9kh4 :cuit?

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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 circui:jm3j (zj ext ii(08elt is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circucp(yqps (su./7ru3 ny h9or -zit increases if R increases. When sy7yn r/o(u(hp s39zq. c upr-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 impedd: y myd4dspz*; 3oo;nance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Th njxr- 7c25jnwe 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 bothjp8qbr(f gy5 q- el*:n /vna1p double in an LRC series circuit, the resonant frequency of jbl* v qn5(p1n8gre-a/pyqf: 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 appliq*36gz67yta tuudj 7+vo hky.ed voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wh, ld1uc /*hzffen

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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 2ftr.2eal 0 )vmgh-dam is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whe am2)vl0gft h. 2era-dn 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. ulf xn .21+enap9vcn-10 m is rotating in a uniform magnetic field of 0.20 T. Find +9l21nun -.a cfxe npvthe magnetic flux through 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 rag1yt1*( s ajnf)e3nc)(ioj uh dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find t* s of nac()n3yj hge1tj(iu1)he 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 8z ezr zjqk +;m*2t3tman 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+iln4yk0 w.z9v ) lkzv changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire v u2r:hjk5qk /:xzq8bon 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 from 0.50 T to 0 in 8.0 s, fi/kz5 2q:q8b ruhxkjv: nd 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 tu jkraoz)f;y5ln2tg7lt ; :nm j jz*+h4rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns anrzzjw8n z j 8aur4p8:xp*h14ed area $0.20 \; m^{2}$ 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 where thc, 0u4uyvedb zbrt27vp+f659o6 y njhe downward component of the Earth's magnetic field isd uy 66tfuv 47jzb,nhr0ebo ypvc 5+92 $6.0 \times 10^{-5} \; T$. 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.(jv:we,.t1bv,n1 axrv( ju kx0 m long rotates at a constant angular velocity of 2.0 rad/s about a ta v11.,x:vbne ( u,xjv w(krjvertical 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 croeto l9 ,cvvs;0n4nyj7 ss-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 tu5zaygwt6b 22dvmg8c-rns 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 recbcgv1c l rz)3zqrzcpk gu 3t9b b86;07tangular 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, whpugz1 )0 kc q;33bvz7 z6gb8 tblrcc9rat 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 14bx-wh0k1y fj 3j8sma 00 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 construct a simple AC genek2am ono.3,u v, e*/nf dd0ebzrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating co d ev,bnn2*,/dafmke3u0.o zo il 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 srmpk ;fl3h07 m/viya9*vwc 3 generator 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 W. The motory;rzahym f.7q*k( h;f operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on 1-m hefb8 4*r* afd9wbidsc,1h20 V AC, and when running at full speeddrm9h,4hi*d f abwbcs- 8 fe*1 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 resisrjh giv4vmoa0+c 2+a ) k*9u4tq5zcpstance 6.0 W is connected to a 24-V power supply. The operating current is s uv+ vo*tz+i42gmk)cra c4 5q90ahjp1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power 3pqsxs ygd1057t3 k p z kdn369z;lxugsupply. The operating current is 1.0 A at full speed. gsl9g xuxdzq63tp;3 3z1s d 7kk50nyp What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power- q0/o:p)n6 e fk(6rlpveadk b supply. The) -l 6vbqdk6e0npoapf : r/(ek operating current 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 ne uwim qq5l;+qe+j95oueded 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 primaxezu w4se3my+ do8 -6cry of a transformer causes 14 A to flow in the secondary.mxd s64 o w+3yeeucz-8 How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 2 dryq( )zh)l9a4-V secondary has 100 rh 9(a)z)qydlturns?

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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 :lndb i,f f6::f0detkpa4 heb,ef 90jcoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currentfp4ejlde b i09::t k,fdeffa,n 6b0h : 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. Ass 4lbaxt4yhk +(di:oq 2uming 100% efficiency, how many amps at 24 V can flow i 44liot2 a(kq xyd+:bhn the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0brhi o jr g(g2)4g+pc77blq q0 mA. The primary coil operates on 120 V. What does the primar7q q) c jgh4opg2igr(blb7+r0y 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 turns o dw:5b7lzo2vx -ofd5nn its secondary coil. If 120 V at 2.0 A is applied to zd5n:vxdb 7 -foo2w5lthe primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on itu+v/w:v v c3dns primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current iuv /nd:3 w+vvcs 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 tra2eom+cv8 qp,x 9d u sl7;bk/lansformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 vu c+2 7mbo9l /d,a;klx8peqsA, 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 3w.-hwlvln nz+00qt pwzam6) ormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can exph3+ w0tvql)nlnw0-a.p zwmz 6ect 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 as 4h);o9 9q 4bpaali .:pxuogtnd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondaryh.a:)bupot99x 4oqps4 g a ;li 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 is usually si7zamqe 75.li tepped 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 tumi.qe77lza i 5rns.

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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 12xji g 13qt -vvl.88npel ;z1 -yo0wh;8 nknxkf0 V. The voltage is usually stepped up to 4500 V by a transformer ko zf138yxe 0pllqkxvw 88jh v1n;;n i.n --tgand 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. 0c iiuh 8;4afx.. zjrj 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 if0fijrci. .z4 j8;uhx a the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a. bijp)vl-c(b n0f,y g 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 olb-0nf ,()g p.bvjy cif 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has t*lck( syf3 8aa total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due toal *3(sf8kyct 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 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. m fnpo ei+f4ng1c:5s*How much less power would be lost sif 45np:e cnm*of+ 1gif the power 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 V at 20 Ak6 6:wpw -de)bedz+x r. 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 :ekd6+x pbr)ed-w 6wz loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coilrfj7a 3rt8dz6q(u m+qi nfv -/'s magnetic fi/aum+ 37vfqf86i(- qnzrrjdt eld?

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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 cont20r ck9w yqbt+ains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constant?wq0+tyk2 cb r9

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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 ph 5*z taon(8z0nku- jc)7fo tin 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.k/a,3 q. qth(kan -nat What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of theq a kb547brljr7o 55za laaql4jbr 7 5zr7k5ba o5mp?

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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 peak0y 7n-yad 6fb4) qh;hj 5axp wtm// owcz)5qpm curreny507zpaf t y4mwopa 5qbd)/c6hwh- xqm;j/n )t through 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 conneyz n5 /hd:4, b+jzapjdcted to a 120-V ac power supply. What is the power dissipated in the resistod dh4p,zab j/z+5y:nj r?

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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 resistoruv2v9 m/9:c + apre-vwoxl l2a 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 vq+nfi-q6/v)pje mavp+yj 05kul23sa 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 5 sj * vvmi:w,b /iyw09l,w/mfm0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-at vq ki:clqni0+t887n+h.-oi qm z t,du5bg-mH inductor 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 *u biao;) udbz59x(ey reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency willzjc6f-52c b f. 9ipxs6t q z4qa4wy-ky 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 reactance at 1xnq9rv s6w7/bhn*8 eo000 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 12930i1a brnlbv8ak exkm,7 5pt0 V AC at a frequency of 20 kHz is appliederin73 b9 vl08a mbk1p5akx, t to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil daq7t:ekscn 2bk 2(e pb*iq. 8lue 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 reactan/gwhdi -; + uorm,5zagce of a 4.7-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 *dke-p5ifio-awq;- x 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-m*q5xnb qws ppy l-xy +23un55nF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactmj k7*90 uouu(h mcc*yance of a 0.010-mF capacitor be 100 W?m*u (m9uhjyo 7kcu* c0

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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 arh9j,)p8j :p:fxul i5t v k/dft 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 r0b, gh 1.e1qhg*ixlwcircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive r,w0hx rbi1g*heg.1q l eactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and ak / l *b1eme)*uf/ msyxvgu:5p,u+kk 1.0-mF capacitor are conn :*ku/kxeg5+evm s*f1 / ukm,b)uyal pected 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 15 i.*ukr 2vwxs 5d re6.r7rjv-s00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac*-v.6sv x kw75irrr.2 d rseujitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2cqp h s,)c1zvcn9d+0y 0-mH inductor, what is the impedance at9+d czys)qn cv10 p,ch 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 connecte/5 hdpy xs9wa*l5j,;n* qaj1sum) vvcd in series with a 20-mH inductor, what is the phase angle at 105a*x /aq5cju9 jv)nphssvwm l1 *y d,;00 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 co2xid7wk a l-miz) 0oq5il and 1.0-mF capacitor for a total imwkd-mq2i0o7 5)a zixlpedance 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 m)zgc* zh f+k/needed in series with a 100-W resistor and 15-mH coil to get a t/ z+gcmzfk)h *otal 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 5 kbf.3b5xyz,f / j:mmn000 Hz for a total impedanf5zk/:3y n,mxf jbb.mce 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 r az 1n zp8kxn(hfb6v5ujb,3: with a 100-kW resistor at 1.0-MHz for a tov3n 6:hab b8fnkr1zpuj (,5z xtal 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 8tvm b,qi:9yy in series with a 20-mF capacitor. What is the impedance at 1000 Hzqy:t my9,b 8vi?

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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 wi m(1mal om*sz30 )cspkth a 10-mF capacitor at 1.0 kHz for a total impedance of 45 1p mzm0o*ka c(s)3 lsmW?

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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 qsx88d t23ky hw,2nz za 10-mF capacitor at 1.0 kHz for a phase angqdwh ,t8x3 kn82 zyzs2le 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 serie.h e7x/rzn*ac8n p2ibfi(m n2s with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?c7z(* xn8einrm af.ihbp /2n2

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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 inw;i -mli4o8 2d4 osvx;co fi0b series with a 100-mF capacitor at 120 Hz. What is the phase8od-vfo oiwc;4i2l 0 b;s4mxi 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 at0o 80f3(jce mtytd; zm 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series 8mmjc e0;tdf0ztoy(3 ?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0 6 6iu/:w-mr(32 kanspambuhc .350-H inductor. The circuit is conne:smpcuw ( m636i/aun kh2 b-racted to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, an8-spko v0qkto a::+m hd an inductor of inductive reactance 30 W are connected in series to a 110- a-8v mop:+ khks0otq: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-W2e egv26.,sxrmdqmd7 resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected t 2e6q7m2mdev. gdxr ,so 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 nedev:nvn 2)b1 :kc4- bril2d oxcessary in series with a 500-W resistor for a phase angle of:xovdv2bnid b-4)r21n:e l ck $40^{\circ}$ 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 hj z+qjo-:o8 b;3i/9ge bxweuoas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hao+ie jooz -x wgb/euj 93b:q;8ve 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 outp bbuc/mtke : ps q,*nizq(,;)vut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplq /q ,tp;e:k *nb)zuvbm(csi,y?

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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 9q23zrz ij9gwt- ls5jAC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has q 0stbr( j;o)qan impedance of 60 W and a resistance of 30 W. What is robj ;s0()qqt 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 Rw s+ d0npj xar:, y6x;o*pge2oLC circuit containing a 50-W resistor, a 10-mF capacitor, and so26ory+ g p ea*p;x:dx,nj0wa 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 coil in 7whf(o7 msy;3bme3 o cseries?ymfoc(7 ; hew 3so3m7b

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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 capacitor for a resohk(36pa fqqr1nant frequency orf(q 3 pka16hqf 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-mH inductom(:l9eu6rh7 .0jnw p*d eodmvr for a resonant frequenc l *e76:jwudv rpe0d.m9mo(hny 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 ana -ey +p; g*(//ubwopm+njfwguu2 d)dd a 40-mH coil if the resonant frequency of the circuit is tgb/d*fe wdu) -oy(u;ja2upn +gw +m/po be 1000 Hz?

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