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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 qf.0lrs 8b/mx 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 indu2jhp p5v)y8wjao1gl1n-8 n i cction 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 loopsue,z : ktx13 ievbjp8; of wire in a coil produces what kind of change on the ekpit : uebz, ;j3v81xinduced $emf$, 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 4)r+9 5 xr ynul7x:bl p1smpsjof the magnetic field through a loop of wire produces what kind of change on the 745mbu 1np l:xj)s+sp 9ylrrx 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 oft;-mbd 2,:x vat.exs a wire produces what kind of change on the induced a-xbmvd.t:e x 2,as t;$emf$, 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 bun*3 0w jqimqkub3qw6k0. ;b $emf$ 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 conductor wil-8h*eu tqfmexa im k2tx m .)-in*19bjl be that which tends to produce which je8m*kt) .em-9mbi*tuahnixf2-x1 q 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 bak3+7 -u3fh x-hokltosr magnet is held above its center with its o3t +o-x7s 3- hhkulkfnorth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. * 2 +ct;gcij1 4r j2bklgg3eawA bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magw4gt2bclg1k*+ re ;gja2 i3c jnet 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 magh -q 6,hzms))j1 hskrnnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil h)- k)6hrqs1jnmh,zsas the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field ve1j.k3ecx /4d-+1ol-0mzajtgm loj c pctor points straight up. The magnetic field suddenly grows s1o1lez0acmok.3p c/dt xg -j4-jj+ m ltronger. 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 horizontal table top in a region where the magnetic fieuctslge4jed3 c4 7 .y m2ziy./ld points straight down. The magnetic field disappears suddenly. When viewed from a j. icysl gdu7te4ze.34c 2y/mbove, 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 i *fhl2igwp 0ey;(x ,ean ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the w (igxip0lf*2;e yh,e 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 wm q6v/ j8tz7p:zqo tw,ire with the north pole entering first. As the nort,zt/ qt 68qp7m o:zwvjh pole enters 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 aktwx*6c5 ob+ on axis whose direction can be varied. In a region where a uniform magnetic field points x6+ c*wk to5obstraight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at con;o- 5ysnmd8 kxstant angular speed about an axis whose direction can ;58ysn xok-d mbe 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 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.f8ecg(6q(dve. gf apgev,-- g
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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 a 4i 56mqtg8my$emf$ 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 ma-3: )qqdffci/g7t)cib7vb a -bnm5dqgnetic 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 direction) is moved northward at ck x;:paed5 maj qqa852onstant velocity through a magnetic field that points straighta:5epq5a 2m 8ad;xjk q 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 / f: nvw sqj3p8*fem*iangular 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 transform+ ;7*maikn w ioj*yzm:+eggc3 s

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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 revolutiuc:gihfu z p1t9; h*toyc.7d)ons each second. The frequency of the 9fzt.ugc oy: td* 1u); 7hpchi$emf$ 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 useds)j ykx hc+, h854xfxv 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 devicevn) ;w..m-cfv ,qghk)xws b (d 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 secondary3 y.ef4t rt5fqixbx .. coil contains more loops than the primary coil 3ei t...qyxxffr t45b then 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 75 s uurmg1r:z,kgr gjps +h**hk:,jjmore loops than the secondary coil then it sj j*: 71kh,g+ujkrp*rz:sug5m,h gr 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 pnca (e3fu)y 8:-g gp *lj0mnsdower 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 wz: 9l+jw )howclup z34 ro7c :vd.sv1bs89nlcircuit,

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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 jdbc7lh. g4d r.cc5dkyx. x:/series to an ideal battery of constant terminal volt.j:5cr.bxl/c g .dkx hdc4yd7age. 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 ideal battery of co *2)wx aqrsn88d(/usl ytgvo2nstant terminal voltage. At the moment contact is made * lorgv2nd28ayq )sts(8/wxuwith 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 andzip+cg rv4 hr ((b j1w mb9q:ez5h2l,i 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 r*pxs7hrjko ez*80(0 sv p+aajg 8+dnnesistance 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 rf7z rq p5*i pwk*3d9oto a battery. The time constant for the circuit pfrq7prk3i * d*z 5ow9represents 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 qmg,0(y w: k xcu)nhzafsdek33,; t0zbattery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease tocxtqg,h0)we0,kud( snzmf3k 3z; y:a

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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 havmlrii - 1zeo,*e the same 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 supplr p(iq hc2o,v h7 *ywt/wk7eu7y. 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 cvz .4pxk1qve-l30*ce2qknxv 04eg pqonnected to an AC power supply. In this circuit, the currenevgqv klqcxkqxp4v-.z e0n4* 21p 03 et

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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 cpovauil 27;j3h8e 92vibdki c c598 pgircuit changes by what factor when the frequency is triuhi5; o9e8j89iad7vvk lbpp 232giccpled?

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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 thec drsc1np p-e6cz70e ) AC voltage across an inductor is doubled, the inductive reactance of that indezep1r nscd c70cp)- 6uctor

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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 rme;3 hb8ejo;inductor approaches zero, the inductive reacrb;83 o eh;ejmtance 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 t*lv8u7,hvj27 le g;h js r gu,r8r8fwoo an AC power supply. In this circuit, the curre,urwgor8vvhl lfr2hs8j*;7 ge u7j8 ,nt

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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 pnem1,kk a d1yy (x*u7an ac circuit changes by what factor when the frequency is tripxn* 17p, dk ay(m1kyeuled?

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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 ap8,y7fvfoock-lm(d q /9 6y6uxoyg - caproaches zero, the capacitive reactance of f/uokqo689gl 7-- yfxy(ydc,oavm6c 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 off ubtt d4dm+4 e99gv/g the inductor and capacitor in a RLC segt/u9e44bvt+ g9mdfdries 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 ci79wzfmq.l-)/3nf k5d m (ys r4icvvwcrcuit 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 increa q6mzvxry:; g2wyq s7-ses if R increases. When isx m27q s;gz-yv6qyr: w this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inc 9w0nebg c,z)creases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedan1qx9mbb tq9j2kzy): ,k,nh gzce 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 andstp:(0dt 0kb w the capacitance both double in an LRC series circuit, the resonant frequenct(kd: wsp0 tb0y 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 lpwxr2xz,uvwq+48q ocg.0.- z- y qea 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 occurbc*a g5p 5u)zks 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 uni3tiz(xhan4k z 7x56flform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are a3 nt iz7xkhz56l4xf(parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a -nkwc n,h6 vx(uniform magnetic field of 0.20 T. Find the magnetic flux throwv-cx( knn6,h ugh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform majdn6;aj3; vha zm3 swt..w*l kgnetic field of 0.20 T. Find ta*w zd;va. shwj.36ntml3 ;kjhe magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced rposde4wf wd*z3:.2u 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 changeyc i htgl72,i*w47okz s 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 on a square frame with sides 18 ccs+/m b6be1c igio xgxn/+s(9 m. 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 gscimi (beg1s 6x9+ncxo//+b 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 1 of26qfy8(y ha5 turns 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 anbiil3(rf7 2uwwh o.-xd 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 khb,oykde8co1ss6z:wqwv s 26 z32f-span of 60 m flies horizontally at a location where the downward component of the Eartswo26z:w16 b,qk 2hscyodz3 vf 8kes-h'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 veloci( a:ft e5ta*dcty of 2.0 rad/s about a vertical tta(f5ea:cd * 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 lo)ibg)+ue7qb 93b ig wajlj( q9ops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistsec1mj qp: s b9gv 0q/cwne+3h5 of 100 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 looem a ) /2efbh4 xiqt;q6dg204hlbmvn6ps on its armature. Each loop is 12 cm long and 8 cm widibxd4 vgbenm qf hql;t4/me0h)6 a262 e. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ( v((p b.ckk3d.i ( esk1uzmg,yiy/spof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outbb/ 9uu p:ltq0put of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the0 ul/ btp:uq9b area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wt2qr1r5yt4 afith 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:3 dau l*z( qnc/bq8ads(tq2e . 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*w7njhk zlp ( bd0nw6dx8v 2f( have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at f0ndxp( (*l wk6bj8f2v7dzhnwull 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 2rrp,nbx7tbx2b89 p hj 9 1nnato a 24-V power supply. The operating current is 8nn1pbp2h2r7bt9nr, xxab9 j1.0 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 resistan47zx;gk :r o 7v6wehawce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed.w7o7r k:azx4 w eg6vh; 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 suppp,vkq)f u zt gq8q)7;oly. The operating current is 1.0 A at full speed. W),o pqfq8;)gtuq7vzk hat 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 needed to h aujo;nis90-ifi4-areduce 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 transform c8u m p9te/dhok2s;;fer causes 14 A to flow in the secondary. How many turns are in th/o9ph tkfmu2ds8c ;;ee 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-wlwdq)0-n vu0dh t ,i9acpxds8a nh6v/*bo( 0V primary if the 24-V secondary has 1006 0wc(a8ah0nw,- ubvn)vo d/*pdi hstd90lq x turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary a*qx+w) /k r8wacq4fl coil. If the current in the sec cxla4wqwkf) qa/ *+8rondary is 3.0 A, what 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 thewhx0r. lt:b,e(.vx fn primary of a transformer. Assuming 100% efficiency, how, n. 0fvle:b(hx.x trw many amps at 24 V can flow in 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 x up(f2c0ex p hp3(+sntransformer provides 7500 V at 10.0 mA. The primarpxp+3fc0h( esxp2n( u y 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 primary cow3vq84ox79 xsxxck b, il and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage isx3x47qxc 9o ,bwvs8xk present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 4 wszef5c5pjx (jt4 4q300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currenxq e c5sjp4ftw44(5 zjt 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 transf wdwkz(e er2247,ayfzormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at 7 aew4(,k ywe2zzr2df 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 it(,q6jauu ky6:7 ca guog: zp0abj(y+qs secondary has 200 turns. If the input voltage to the 7 pao0: (cy,y:qjuu(k6uaja6bg q+gz 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 tur ;b7b 2cdqt)zmns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionatz2)b b7 dq;mcl 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 9klwdepnya9g)ykf o)-. ;au4120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary haskga )-akdy.wny9;9f)u el op4 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 *0j . *z z77hkr;y uln)ucxdewusually stepped up to 4500 V by a transformer and tran7u y*r0 z hz*l dun7x.;wc)kejsmitted 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 6kss/p rmy9o7apg5;ez6 bz6p 00 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 t69;zgpom y k ar6 p/0zsb5s7epransmission 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 total resistaxkz.dsr drjc87u:2k :u,jot9 nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy l u.dkrs9 8:2jd7xcuktozjr:, oss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W -3xdnbnc02zu soy)(uo( w *9 qlk*vjl. 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 trannluo0lxsq3b v*-wjy u*ock2 )(d( z9nsformer 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 less pok6edsrl+h8:z8b ag n(z5v q d3wer would be lost if the power were transmitted at 3000 V inste vgd nq z8:+6az(kdes5lbrh38ad 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 tr tibnw/xm.q*zw hc z4/z( 5d9kansmitted on a line with resistance of 0.60 W. To what vowkh 4t./cxzmbwnzi9/ d 5(q*zltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original 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 a:bqf*7iu5 +zyviyvd 1y,0hsis stored in the coil's magnetic field?50yv+bizih:qa*1sy uy,v7 f d

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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 resibo5:to l98 o70ujcogdstor and an 18-H inductor. What is this circuit'sogo uo:79d5cj 8tlb0o 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 ACn;ois, 3bhdl 4sj,(z l 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 oub f5ubik9 b35: h:arg*k7mdq ltlet. 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 resistan:1pt xd0c9fz k se5r+nce of the lamp? :+1 cpxf 9zt5erd0kns

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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. Whatot;ubza 7/w0/1 :xcdg:n kb9h5vtm lo is the peak currentgwu va ;bkz7oht/ 5::1/b9oc xtdn0ml 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 connected to a 120-V a br /e +9fuicjzb/.b4uc power supply. What is the power dissipated in the resiszu+i bb cjf9b.r/e4 u/tor?

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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 resistc0x :::rfyut qor 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 5dv/(6ou8xs8 :. urywjeh2do w0-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 a4vwb fid) bsb9.3)qc50-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-mH axs0cszs3*4 d 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 reactance of a 2.50-mH coil at 1000zjg wik 5.n8p8 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 of inductivsxjl- vvthhd-w6q7bq a5; v;c 3a:c7ce 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 inductikjx+r uduwf ,,zdm- v ;08iz*cve 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 tgv(o, 2be6)kefwz)r 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to it?)2woeve(gr ),kfb t6 z

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, *nh e)u*lu.jprehi/g7b/ m q +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 reactanceyh,7c7m a0hlc 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 reactancegh/j*yg 6w+ do/zpql( 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 havef 8 zaqf7.t(mb.i-q8*ijl kov 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 thqfo-rn *qn(t( e capacitive reactance of a 0.010-mF capacitor be 100 Wqno(nfrt(- *q?

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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 10mholx03 d7f v*00 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 ciqzp vj w*2.y)qrcuit with 12.0 W resistance, 15.0 W indu*qqw.jy )zpv 2ctive 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-mH coil, and 1yfks+))jz7* skye b d;.0-mF capa *ey dysjk)s bkf);z7+citor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, ujqu1i k7 he2ssw nx3ej):q; 720-mH coil, and 1.0-mF capacitor are connected in se)unqeqsje ji71h7:3 ;sw2xukries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isqdl * 4n77v6epsc:r oc the imped:d7pns76r4v* eqlc coance 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 sep:b5/uggl*kadziqps *+/ f y:ntby; 6ries with a 20-mH inductor, what is the pyu;5 kgnypd+6/bqgszib pl:t/*a * :f hase angle 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 ci h zb68soya/d5.wh s856vmkxorcuit with a 20-mH coil and 1.0-mF capacitor kh obmz aso.5h8y s/d8xwv566for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 1ny-g (cr/3 a6m* lp.r2 odqjjw00-W resistor and 15-mH coil to get a totaogc rm 6/qd2*wa(njry .-3lpjl 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-m-sftz6 jd;k tr077r41c2px ap j4b riy4+jyeeH inductor at 5000 Hz for a total impedance of 40007jtj7zj e pb0s2 rcp+fe 441trkd;iy4xar- 6y0 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 t v:sznpd u/l.s+g9 *4hdq1fnkotal impedance of 19* ds h+z gdul/q.sfpvnk:41 n50 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 ,fht0 c;)bv7:f v pe/nkpjzf4with a 20-mF capacitor. What is the impedanceffhtvb /cf pv0j:)7 4ekn,; pz 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 y xflk9082yyhin series with a 10-mF capacitor at 1.0 kHz for a total2flyky0y9h8 x impedance 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./a6n k)qj whe 3blr,r at 1.0 kHz for a phas ,.hrrk lj/wq)6 3enbae angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0h; r3zd4wow.c kHz for a total impedance of 45 dc4hz;.3wrwo 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 syrsk.0p0 i k0 dpfof s.npm.ro9gh *.0eries with a 100-mF capacitor at 120 Hz. What is the phase an.0 kmossi00p * p.0. .k f9ghdoyrfrnpgle?

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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 iyy/2.9yk.nk jew yq /v6x)on nf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ayq/ .xyy vo9n62key/n )w.n kjre 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-mF capacitor, andnijg1i gy 4 b(u1il,d, a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rmj 4 l1,(bi gdnygi1,uis 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,n pb-/pmys 83w)mgij76mfd 1d and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thiwy3 pn6)8dm/ib1d-7f jsg mpms 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 angqnl)c1; *yv)mfshv4 ule for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when )vn v;*u41lf)mhc qsyconnected 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 forf50 vr9t1, nzsyczn;v-nphqg 1 ajp,( a phase angle osn-q0gz(1v1ztn9fpy ,c5; an jr,h vpf $40^{\circ}$ 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 =*t,6iv tb m3jb 10.0 mF. At what frequency should t v,bmtbt *i3j6he circuit be driven 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.uq3r:d+d, jop: xr(fm0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circu3xjd(q:um, rpo+: rdfit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circmlc:t8qt+)r x l f1oh(uit 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 30 W. Wh;*2e:v( *i;q*ozjhmglm xcw bat is m(lxw go:em2h **; bvizq j*c;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-w t-;aajsue t 1*0sqg a 50-W resistor, a 10-mF ca-aq sa0ws;ugt je1*-tpacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-me9- a/ q symmqymw (c01k6ph;fb.nn+m F capacitor and a 15-mH coil in series? pm+ybh9n ns. m -ayqmkfw 1c0mq/e(6;

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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 hx*p*)uqib j;jvod5 94.7-mF capacitor for a resonant frequency of 10 kH*b)i95o x*jvuh pqj d;z?

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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 s0k3qlms 9-y/zeo/sc leries with a 3.7-mH inductor for a resonant frequency oyl- csz3 lm s9/k/eq0of 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 bel 7,s2rnfm.b 2l(rgy e placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1rrsf lyb 72 l,n(ge.2m000 Hz?

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