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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 followingajg9ax*;bw 8pqfv f7b-wx6g2 are units of 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 inducts.,uhgrz ixa3/85mqzion states 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 in a coc 1j :hx1wr o8yuw(i1 zjf;/chil produces what kind of change on t :/roh(1xwchy81 f jz1;wjiuche 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 magnetic field through a loop of wire produu 35ghc4r2qku b2n l:uces what kind of change on cl:5bku3n2u24hu rqg 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 cs0b*ec ovh 6d3qbc3/of change on the indud6cb *evc shb/3c 0q3oced $emf$, 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 fieldl2 ahc9qckx 5+srkc5 r,-3 jw (0fbklv 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 i yt2fuaa *fpla6tk,9u: gg /3ln a conductor will be that which tends to prodg26lku*fpa3f:9ta la/ut, gyuce 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 horizontal table. A bar magnet is hely6.nscvn14 me m7o w3n +jbs1qd above its center with its north pole pointing down. The stationary magnet induces (when viewed from above) 3ns n+7bcmwenvy .qo16sj4m1

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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 horizonva:wpuj i(au)yes3ng;9a 2 ;ktal table. A bar magnet is held above its center with its north pole pointg k 3awauen 2s9p;;)vau:jy (iing 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 fiel*y f,qy(9*mc dw/dqr md vector points straight up. The magnetic field vanishes suddenlyq mq*(,rcdf*yw/md9 y. 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 tasy k qo6s:zoqte+e/5t) -l:peble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, 5 o-tqekty zse:lp/s)+6oe: qwhat 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 magnetizk7r cmpxn/2 5c field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inp /cn2zr5xmk 7duced 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 tabled az;s tgsaa+2q-ez(23q2 pru and carries an ever-increasing current northward. Two coils of wire lie flat on the table, og22u a3 ez-t z rs2apadq+q;s(ne 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 north pole enwud p1 2li.)jxt,y1fhtem+i:tering first. As the north pole enters the wirl tfe:) .h 11impj i2x,udt+ywe, 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 o-cez g41e qu,speed about an axis whose gc4zuo1-ee,q direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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 atz; rq*r5+q lyx/for8o constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiefy;o8 *+rrxo/l5qz qr ld 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.:pdnxtdu+d, h pi-+h8e4 7ku+e 8djyt
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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 a:gq3icdl hq312s abhzd7u fai)+h2 r5n $emf$ 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 magne) h2d0i)qf ge0rm*fae tic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direcc8y nk 7s*,ts6mu(tw ption) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pot8mkts*t(s c wuyp ,76nential 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 const zmn5zdav/v+9 ant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tranc(zf3) e mizq0k5: nmmpy6+x lsforms

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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 (e)u2, f7ko,c.uq tef hb; yzse9t+qlthrough 60 revolutions each second. The frequency of thelc 7ku)beqfh(ft;e2us+.y eo9,zqt , $emf$ 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 used ;3g kuu i0etl;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 devic5oh y;f8w;muuhmmj 46e 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:wy c /um49mtqnizl* ) loops than the primary coil t:/)ym uiqwl9ct 4n*zm hen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary fd8+eql ;hkexugq(40 coil thend+hefeguk0;4l 8xqq ( 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 inpuu9 ,v/fou (4ipw39g0tvfmcey t

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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 circua4gvevl83 2n oit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ofvmkw r*/d.q yi 47t1gt)ig 7ce constant tik77ti* dr4 v c wt)y/.gmq1geerminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an i4 ylp:zs t-3wcdeal battery of constant terminal voltage. At the moment conta wts3pzy:-cl4ct is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induju;jt5u /,an.0p/hvonv;c;* x wt fhw ctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is con x,e09ad1h y.h:edda gnected 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 time qmhs6 035ocqp z *b5e+j p hs+zglctr9dr,4w9constant for the circuit repres h*4+hrjp,lz+ r5 60sqd csbpm95cq w9e zg3toents 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 series to a battery. The battery isv2o9 wo/t)j18-9+fhwsc i a -iyynutg bcn9 9e suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current tj99+ht2uc9waio 8v -bnot1ysfi w-g e /)9 ncyo 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 unih.l5sres :g.igj50h qts 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 2k/wca2/qrw j1ati i6supply. 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 pq9dbevt-k2ywp:,5 jm ower supply. In this circuit, the current- t9 wm:byk,5e2vqjp d

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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 c a.mh2 81irdeyhanges by what factor when the frequencyhyeir2a8 dm .1 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 v3opsmub c0i,- oltage across an inductor is doubled, the inductive reactance o ,p- c3osi0mubf 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 inductio63.axi5kl,7 v) swjq; mwqtor approaches zero, the inductive reactance of that wktw).oij sv7, xl5mqa3iq6; 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 ld;c2a- yib- 658rtuz dp)yqtvhq:9tAC power supply. In this circuit, the currenv8z -6iqyc-5l 2tdp ;)ahuqt :tdrby 9t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactal ui 239ccigx a8g/rf9jey(9bie d -+rnce in an ac circuit changes by what factor when the frequency is tripledre9j/ - c+c 8y3gb99i ielifugr(ax2d?

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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 c+sd b2 cle.fpd +9k(yrapacitive reactanlk.yr p edcd+( b9s2f+ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the ind ll8wro(4. (xy ze8q0mmiyb0muctor and capacitor in a RLC series ci 0xl yb(48 e r08wzom(.imymqlrcuit?

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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 RLCno:/+cfw0pwn+1 m0ay6u w uc z circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if gdbm( 3c (8roa.s,5nsf yml*nR increases. When is this statements(rny(cdlnba8omm*, gs5.f 3 true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if 6eqj 0rzy5w(u$X_L$ 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 impedm2v4hsitbwu); 83o j1p / +vm3qzmjwyance 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 capacit o(y5x x5(xz9- 3ayh1x qcudvpzn9v 9mance both double in an LRC series circuit, the resonant frequency of that q yn59zc(3v y91 dxxxhumv- px59(a zocircuit 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 bosk5 h1bpq5 ro8 6d9xdglx 72my 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 oqg(c +5tfr+l 9m lv0qgccurs 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 uniforgwj: +yj )fx0fm magnetic field of 0.20 T. Find the magnefx+)f0:jwjgy tic 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 ip-3w2r6 gdsl in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when -rw3pg 26sildthe plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2a bo-rx n* 3-sev)jas)+ hzqa:0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle on)h qsbv*a3a )-:oarx j+ sez-f $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduceuvoit;kqy7wp9: *bt+d 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 i (+yzqn(9uk+y0qq kx $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides / dlie. k+3qjg18 cm. A uniform magnetic fie. e+i/qdgk l3jld is 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 and anw qc8( (w/svft 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 an0sd1mnz v aqx ;4i-*ead 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 sp6-weg b7w0rlax0av g p3,imf7an of 60 m flies horizontally at a location where the downward cop0, aewgbilfwx v -7g am36r70mponent 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 3zehj/a0k zv.+ n olbqm8+3xa2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a ve03+8vol /qz+xm k3ahb.j nezartical 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 jo8qu6t-x - j9t2vkx 1gc uv,pa 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 10l k1)u nh2tmx:e1 n6uq0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. eg z/5,firh de,p.6pfs+ orx/ 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 +gfe56/o f s,p/ rxizd.pr,he a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnsyr-77(rv*x m) ev pxuf 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 constrxzt yrr2 +z)s)uct a simple AC generator 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 rotat+ zys) xrt)z2ring coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxim7t(ch(n bfxn xqsmq)0g87 d:se2p4p5 0bvo juum $emf$ 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 resistanr ,gmpehx43 6ace of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor lr2( 7wzfy):1l yxcon have a resistance of 6.00 W. The motor operates on 120 V A2xl(yrnyo)z 71cw l:fC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connect.dy/t0r ea 0kxh9sv-zed to a 24-V power supply. The ovh 09x yetr0-k .das/zperating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 Wya7o nvk207ou(n+6locz (r xw is connected to a 24-V power supply. The6r7z v0+(7o(wonl nuxkyo c 2a operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W s )a3dgehx wnbyb2(;p9v;p2u is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back n2 2xb) e (;hwbpp3 yudvgas9;$emf$ 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 needed penoo- it c 60 9px afzo5cdx6:i70m-zto 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 in t78a(tl7yyqoouz 8h19uz ).x m c 2xiophe secondary. How many turns are(x.zmp28y77oco uzu 8i 9 1atx oyhql) 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 primaryi+is vk t(;c.l if the 24-V secondary has 100 tt;iiv+ c(.ls kurns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a jd) smtyb9w)(ttyd gq.x-)q/ 2000-turn secondary coil. If the current in the secondary is 3.0 A, wdd)q)mjbstxwy t.q /t-9 g)y (hat is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary oous 0zf,l5-)5x mgkg t vkm0l9f a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the se)5fv g5xm,s0gz9ukomllt k -0condary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 yqrzt(r 6u2/5p, e,jgp cdm,jmA. The primaryt,, /mjygepr2(qr5,u6 jp c zd coil 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 5 9wmln;xnrg ;e2. cdmprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secrwcl 5n;dgn 9;.mx e2mondary?

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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 ym)t h-q kp:*sg1dt7iturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is* p:) m1ktid-shq 7tgy 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 tukx 9oylmg 71 fbtc(.xakz54+ yup:o56iep,bprns and its secondary has 200 turns. If the input current at the primary is(tf ,cok7abplm19pbz6py e5x.5y:+guk 4o ix 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 transformer5kj eyfhl1o ,e znp*r,j ij:,3 has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of th3k,,je 5,po rzi e:ljy*1hnjf e 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 transflyla/r- 4fb3 j 8 jleb(7u2opsormer has 100 turns and its secondary has 200 turns. If the power input to the p/jb-r7 ( 3u4jolfa8l 2ep slybrimary 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 oa5*pd6g95n9wz 3i 3ukomlvup f 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 number of turns upoa9 n3k6zg5 3pmvul5w* id9 in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A +7tp; jcld: cznn9+ peof current at 120 V. The voltage is usually stepped up to 4500 V by a c; c:t7pd9l+pn+zje ntransformer 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 605d xpy*i;13srgbq /y q A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted througs q5x;i3rdb 1q/y* ygph a power line 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 line 50 km long has a tot7oy/oct 8k0ilg .ly y;e ot(k:al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage o olyy it k.o :0;lcty8o7egk/(f 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 longu04 hdys pbk-tq 2/z42zoz)sy has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformkpu ssz4y/2 to-zdb4)z q y20her 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 6omr. (hthf3 *t-W line at 1000 V. How much less power would be lost i ttmro*.f3 h(hf 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 A. It is to be transmi kwwzf +xp.wb:m(t* 0wtted on a line with resistance of 0.60 W. To what voltage must the gene.: fww(bw0k +xp wm*tzrator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How mucha:iy, sg/ics6 u-6eb t energy is stored in the coil's magnet6 /-uy6: cisaigbse t,ic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is *h2qa +jb*zu nthis cu za+nh*2 *qjbircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit w6ll +d wxbero01o2, i 8-laephhere 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-V2ap(x9.gfrwd- e9ug 5ahp n2 m AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance nl5m(m c3b9:aiyjg*eof the lamp?l5mic *m(:3gnb9 e jay

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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 s/nalw 7 5i *:q69iwam-vhekgpupply. What is the peak current through the resistor79mha6g wv*p i q5ila kn/w:e-?

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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 connect0a7 wo0jw s,jn13hwxsed to a 120-V ac power supply. What is the power dissip0,ox 3a njs w0ws7h1wjated 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 resis2p; w)vthw u,ajrf1.f3 tj 5 hx.o0sootor 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 resis5:hhcxq0 g ;yitor 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 is 4z k2l38 ,i uqdhg 9ps.fp4frm$I = 0.80 \sin (240 t)$. 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 b 86wzps:t(pqinductor 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 2.50-mH coil v,z nre0 yn;nt1h p46zat 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 14.0 W oocxt8: c0iw 8pf 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 reac w9r( f1 )cs7lpt8peintance 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 frequencp .njn)-o zqtby r/8,by of 20 kHz is appl tjzoynqr,-bpn)/ b .8ied 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 due .s3tahl9b u8e -yje mt m(m9a*/y f8tlto 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 xyc7e1i:09x 4uxfmgaof 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 capacitp4u7eudd* rp; z8 8rohive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance o+ y-wlve b08tmf 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 capagi( i6brangn 7yk 7/d2citive reactance of a 0.010-mF capacitor be 100 Wb7/nr27a gigdy k6(ni ?

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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 th)d0hv qz/dv ,rrz4-tj rough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac bd :2,7/*+dfwi *ksqap pgwenseries circuit with 12.0 W resistance, 15.0 W inductive reactance,sbki2n, e** wgdpdw q:+/7 paf 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 vqpw/ qep;;u2v o-yc .if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected/pq; pvq.y voc-euw2; 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, 20-3j6p8*lz+9 op ggvvpomH coil, and 1.0-mF capacitor are ppolj+38gg*vv po96z 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 indu,l. jfpp9chg5h4 o,gnctor, what is the imo5ngp cjp 9fh.,,4l hgpedance 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 series with a 20-mH inductor,4i osv jmq0c1: what is the phase angle at 1000q i:j 0s4mcvo1 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil c3;m4h.p ebr06utm iddn/w 0f and 1.0-mF capacitor for a total impedance of 10 b3hu. fd6i4wemm pd/;rt0cn00 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 followingryd0ier-8,z n f1wf(l capacitances is needed in series with a 100-W resistor and 15-mHf-ydrwl z1,fr8 ine0( 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 dc;z+2 b nn,qoseries with a 450-mH inductor at 5000 Hz for a total imped+d 2;nbozcn ,qance 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 1.0-MHz for a daxdc u: hp,1:a9t xj2total impedance ,pa9: d2xjh:tu cdx1aof 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 serih r)t u;ydaiw x83l-*res with a 20-mF capacitor. What is the impedance at 1000 Hzy;itr d3h 8)-*lxwrua?

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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 ca.)odrbd wi :(7yx2zmnpacitor at 1.0 kHz for a total impeyxdwmno.z2 i:db)r ( 7dance 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 neeu+is/vegpr )2 ded in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofg u+v) rse/2pi $40^{\circ}$?

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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 wit 7f7vv2n:surodm3 - uvh a 30-W resistor at 1.0 kHz for a totalo7:m2vfvdvnr-3s u7 u impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor u1e0zk4w+j t3 twe fq2at 120 Hz. What is the phase ajzef1w3e+ 2wq4 0tt kungle?

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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 Vsby+ fo5 ,1qm**w ereh and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect+f5rwe * sqo*,hbm1eyed 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-mF capacitor, xdiv5 n 04cmvd.ge4x( and a 0.350-H inductor. The circuit is connected to5 4 dgn(xmcied. v04xv 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 capacb -7;yrrvw .vj8t;gqm*z +gqqitive reactance 30 W, and an inductor of inductive reactance 3gm b.87-r*vrq jqzyqgwv+;;t 0 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistl 4k9by3ze, zeor, a 10-mF capacitor, anzye3elk4, 9zb d a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase a 5b gb.khci5*2/gzeg cngle ofkgcb* g.eg2 b5hzic/5 $40^{\circ}$ 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 frequen4ztt 0z8ux e prka0,l,cy should the circuit be driven in order to have 8 t,0kpxzz4a0,u ert lmaximum 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 12.0 W resistan o*yz q(t7y3p2yab; sbh p0oa rwv3xen:ys 4(4ce, 15.0 W inductive r0po; vyway33 s( nts4z:2( yqpy o7 rea4b*bhxeactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of aruxkv y1gx m;2c 54rz;n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an imp azbia5xmbg4-)4rr92j7 vnz g edance of 60 W and a resistance of 30 W. What is the power factor?j g- ri4bm4vrgn9a bax)75 2zz

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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 resist5 riank5 mg h9cdxr9m65 et:s.or, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?ra5 :hn.gt5m6e5 k cm99 irxds

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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 1s6 ,db9q9osls(pr nn1.0-mF capacitor and a 15-mH coil in series?o (ss6r sdqbn1,n99 pl

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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 serier20jnxd k i( s(;vld.os with a 4.7-mF capacitor for a resonant frequency of 10 kHzvx i.2d(oslk; j0 nd(r?

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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 i mc dw 6tu2)i)bpk):cln series with a 3.7-mH inductor for a resonant frequency of 1000 H2)t:d pk)cu b)lc m6wiz?

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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 br8(e yx(cx7t xe placed in series with a 30-W resistor and a 40-mH coil t ey((x8xxrc7 if the resonant frequency of the circuit is to be 1000 Hz?

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