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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetijjkf )o)tevk2hh l/2+ak/-7 nji )xsh c 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 statesy(j14 vojvd3ufix ;t 3 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 coil produces what kind of chan1gea) cr;9 aatw:-+ jnifzm/ege on the indur ai:wa1+en )ztc;ea/f jgm-9 ced $emf$, 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 produces whatyg)x9;s.c, owgw)ys q9 tt.fn kind of change on the inducedofqt ss)gcngx9,9. )w.t y w;y $emf$, 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 wirq a8wo529evz me produces what kind of change on the induova 95zqm82w eced $emf$, 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 fromp,j5.j euc 4z04 jviie/l5i uxv, mk/k a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induce9c5p )vo pl)nsd current in a conductor will be that which tev pn) 9so)lp5cnds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat oo0 9*ysrrh)pl g6s y j6gzv3p+n a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet i)os+rvy*g3 j6p0 yhrgl6 9 psznduces (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 hori/lur67hu/,pjsr i ev5 zontal table. A bar magnet is held above its center with its north/7p l,ehisu5r6/ jvru pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in aa 8oad)x).vo c region where the magnetic field vector points straight up. The magnetic field vanishes suoxvo8c) ad.a)ddenly. 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 where thn )nk;s *q)is i7)kgkde magnetic field vector points straight up. The magnekqks)n 7s k)*; dgi)nitic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where ii(g 3joflc3qqg ,wl2 3 -g6iqthe magnetic field points straight 3gqq6ofgj3iqc ,gliil3(2w- down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries a 5b:*+pzcgg rz3fs *vcn 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 induced currec p:vc z3**g+5zbf grsnt 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 ent:d+/itcawe yl x7 ,9nvering first. As the north pole enters the wire, the induced curr:i,lx adey7wt/c n v9+ent 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 rotuu; kmf- w b1a;c*ohosn 1*g6vated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's ax;ksf 1*hb-mnw v*1 oug6ua;cois 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 w( x/ 95pxsn agvj,9uumire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fielsu9g5, 9xan (ux/jm pvd 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.7akgakc y 8,*t
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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 thatz;b.m rhfk. 5i an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnti jr2p 3r(,xvcjc+u .etic 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 dirh9v(hp fd94znkt0g ( wection) is moved northward at constant velocity through a magnetic field tkhn9z90tfvgh d4(w (phat points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a coue+n ( lzfxb)+nstant 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 transfou)zf5nx.qdn 7rms

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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 6u9 c .z :rvfgnq:2ifc+0 revolutions each second. The frequency of thv.nfc : f2+ruqgzc 9:ie $emf$ 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 used1 hqf crr-c u1z;-,thku9whf0 to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tg; etc3d.xtgm2 x9hcj;.mwo0hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primams30 c-vmme h-b8i6e rry coil then immehic- r6 0ms3b -e8vt 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 lnr8grv cik +t 1h(u3k3oops than the secondary coil then i8kirg+ un1 c3t(khrv3t 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 pow *hi3zodiz:elqtjg mt1),34i er 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 k 4, eqp)l7 :nzexqw788fxyjycircuit,

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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 conn7vcr2bvj / 1x b0yygm+ected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the cgybmjr 7vb012 y /vx+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 cor)9bogx ( 0eblnstantb(b90r )exol g terminal voltage. At the moment contact 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 inductance L and resi.anqk(l)1q 9pwk+ etjstance 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 connected to ady s(woyq/0p liwm;k a6z3j34 n $emf$. 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 connectea73p0zggb 8s vd in series to a battery. The time constant for the circuit represents 07g p3szavg8bthe 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 rt 07) em4nf/vjp*j;:zkuvjg battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required formr/)nju gp:jjf;7vkv04*ezt the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exce .o+5uir60e9:yqylzp fi lu3kzw y+b)pt:

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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 niq6jk .htm;/ power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. Ib6alk qjb*qi:,m;/v 0t ; saayn this circuit, the current0ijsm ykvb q, a:l;;6baa t/*q

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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 wheg.+m vh;nfe5kn the frequenek;+n gh.v 5mfcy 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 inductively7ye )be9.f5rrtaif r h5t9- reactance ofe 5 fy-te7flb r9a r).5t9iyhr that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zeq 9 1xjiq5dt g9;gzkr9ro, the inductive reactan5i99r zgdxjg1 q9qk;tce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,mjtb o6oy gijd59:a+-g 5d2frpt w70e the currenttrfm o7:yi 9gt 60j+-5eodp2dw5ga bj

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor *w*f2xx6o yic when the frequency is c*fw*iy x6ox2 tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of thceocs xw-- ;x8 52cuiue AC voltage across a capacitor approaches zero, the capacitiux8 uc i52s-cw-xc o;eve 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 angle kh)90l wbop /vbetween the voltages of the inductor and capacitor in a RLl0b/9vpw k )hoC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is define,6j k;7rytx nkj8 *y*shbg .dsr6 bpo7d 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 circuity p hfhisc*2/6. The impedance of the circuit increases if R increases. When is this stateme6h s*f2p /hiycnt 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 ofrp5-rfgme+e zv, n-1q 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. (37;xtbol6l k7)4rje0nxsll if: u nqThe 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 capacitareh;t/fj w-daoch+7et; 96 tlnce both double in an LRC series circuit, the resonant frequency of thj-h;tt9h+ a/wceode6f7tl; r at 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 awsd8,vqpfkb8o;q7 8h xaa19 ln 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 o9bi8*q i7vkj tccurs 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 un.ff(twtsm,l hpq *7j -iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the,7lhpf wf-q. sm*t( tj 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 rotlw9c+; nu9r9rr l rb/oating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn r uc9nrr+ol;r/lw9b9etic 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 6q*rc.2f7s yjfutt2 funiform magnetic field of 0.20 T. Find the magnetic fq 2r*sf.u tfyjt76c2flux 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 f2wg-6 1y :wz:ub,cffoat mme;rom $1.0 \; m^{2}$ 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 j0ak3*alivo*s i;tls (f95ln $4.0 \times 10^{-5} \; Wb$ 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 turns7 wja.1 *zjt2br2;el,i palne of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the r2jb2 j *1alwaezl7t,.e;i pninduced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an.z:* f2 ;j(ia d)at(v sufnoag 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 anhd n).y9cdjoz: yf. k9id+hf/d 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 w)4r:xaau8,:q omp9k/s: 2f us og bygwhere the downward component of the Ea4wg8xo 2yusf: :s)9r :gaou ,kpa/ bmqrth'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 barr,oq,9jk4 *7ih0 m)9ldvjx 1 l dug:zwsza*oa that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field h:l 9 z,damql gvjui 49 os0,*jz)dxr17 oa*wkof $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectil u h(/1kabpr*onal 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 o e v) 1eau0s-d,icios2f 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 loops on its armature. Each loop is 12 cm l l)9p fyi72wldon 72wlpi9df ly)g and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of 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 of ar6c 16z: lym13pbcpex mea $0.090 \; m^{2}$ 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 a8 a63ktry q3kun output of 12 V maximum when rotated at 60 Hz.kuk36r3a t8yq A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a ge +of; +7w.ui.vdmeyt2rt vw8tnerator 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 resisxphw0;kc k+ w -3pho/km 0b fw1)ujm8ytance 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 have a resistan8t- hlm ,uokfbhkp5g* t)/6lxce of 6.00 W. The motor operates on 120 V AC, and when running at full sp /lh6upk b8*tm k l)-hgt,ofx5eed 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 resi civa1j8,,eaystance 6.0 W is connected to a 24-V power supply. The operating curren 1a ce8,ay,jivt 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 W is connected to a 24-Vy)du 7 w jfu+twpm(+;u 84msvi power supply. The operating current is 1.0 A at full speed. Wha 7y u+dvtp jsfu wm;m4wi()+8ut 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 supplyz)ac9 j;*pd lm. The op*l da; zjpmc9)erating 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 needed to reduce a pri78n :,7spgm;m qnnbi y /fc+tp/zg.awmary 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 tra2(6u.x zl mnqtnsformer causes 14 A to flow in the secondary. How many turns are in the secot 2l(x 6.zmqnundary?

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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 24-V s4n mwjz6o-miblr44 b1lt0; xs econdary has 100 tuwirz4s4m1x m 04ol-;6l ntb bjrns?

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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 ckwx8ob1 u+ srbw:1z;coil. If the current in the secondary is 3.0 1u:ww+ c;rbz 81sxbo kA, 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 thefozf c*o7u: , p1hj pjr.vfq:: primary of a transformer. Assuming 100% efficiency, how many amps:qc: jvojp o.f 1*7 ufh:f,rpz 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 transformer provides 7500 V at 10.0;he, yw5:pmk a mA. The primary coil owk:a5y, e hp;mperates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300nf wn(v.(.t9,v/mtogy k+nfl turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconda,9 y/.kt(f.vmtw v(nn onl +gfry?

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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 300 turns on itsm*nfsc2-+gc quh fq 02 secondary coil. If 2m- h fuc+2fqqg*s0c n120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec)pf ua ojs92/nondary has 200 turns. If the input current at the primary is 100 A, we can expect the output /opfan)s9 2ujcurrent at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its/pe d) j08l,b3gavgvn9sz4ge secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to vb/ns8ad , j)g e4l90g3g ezpvbe

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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 transform.e ko;0 gu/claer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of theea;ku 0.ogc/ l secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12-6o4 a irsj,t/uu d5wo0 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 numbw/4,ai- udo6 otsu 5jrer of turns 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 of current at 120 V. The voltage is usua*z5 g5tdafl-,q)e l:ixqq;ch 0jc7cplly 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 t dg,5e j7;z5qx*)th p:lf c0lci-c qqaransmission 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. Thd+h :s. 2y 9rhrtkk0the 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 powkt9.kh ryd0s2h:+rh ter 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 total refxq c35a ;qm;csistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to 53a fx c;cm;qqheating 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 55;b xg;bdujxzl7x+akm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns+xudjz;ax5b x5 bg;7l ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power e0unjx i 8,b3(d t ztb2o1 rs8ul86vlcwould be lost if the power were transmitted at 3000 V instead2rb 3(8nubl1v,8judtos0l8e 6zi x ct 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 genevdcgf, ;. vd-qda0a8 c uogf280a,awyrator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original po;uqodggcaw8 a0dy0 f, v2,fa d.-8avcwer?

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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 3.ej6 pi4wrri 5.0 A. How much energy is stored in the coil's magnetic field?6wi4p jrr3e. i

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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 reblo /b 8+2e q7q0i:rkkxa,ddp sistor and an 18-H inductor. What is this circb:l + eqki,dd2bo8xkp0 a/q7r uit'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 cizv88 w6v4igf js 04bwrrcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current)hl0ue p6n +;3zx nqoc?

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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 ou7*v 49ll fa1wu5xyllmtlet. What is the resistance of the lalm4ul l v 7*l1fxa5w9ymp?

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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 skjc5-.jzc p3 k (on-qvupply. What is the peak current through the resistoq-on.p-c kjk (jvc3z5 r?

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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 1sp f;m 8pbv+jt6vu uzx,m ,/;r20-V ac power supply. What is the power dissipated in the resi tfs mb;pvm,8u,/v xzj6 p;+rustor?

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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 resisto3s yx549m;js kjd u(vbr 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 5o5o/ s:c5 -d/mcbeyk1/oo iy2p ,ogype vo .y90-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 aa0 hck-7h8)sgm r,j,plj, gvy 50-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 inductor at 6yuuq mmgy6*s9q 93iyk i3: -pk0 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 1 up3z7 .2 ezic3k eus)xo00x7qd2cuok 000 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 inductive refu .j e5(fqsv ,t6)ndaj1d,vqactance?

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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(s vu.o)+km hn W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freque :.r 84s oc8m0 .bpovepvgm8jd7cpk w3ncy of 20 kHz isc pd p.r8:bv4gme8mv380 jp7ws oco .k applied 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 to a 110-V, 60.0 :hx 6b knsi / jek-/)o+bor:cgHz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of abs2hhwmk jl18w/p9z9 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 50g*0ra- av2nwenvz7xs*s t tg l7rl23) W of capacitive 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 auv z9fs;)cl04asb y:b 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 rea r :u *v4eta0lhzi7d)jctance of a 0.010-mF capacitor be 100 Wv7:lz*ei) j4ath du r0?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz (; d++uxfel, b e/pynoand 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 serie0f d n9z4wdx1+6ke*1rroguhp s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 9* oe0rr16pd1z w +4n kfdxghuW 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 resistod (w36yu *re/hw 4*s7uvdhyy(/hjyye r, 20-mH coil, and 1.0-mF capacitor are connected 76/hhw*dyue*4/yyj(wd3ys ruh (vye in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH co8nn1 h c5ewqpvz;u0 uz d/b90ail, and 1.0-mF capacitor arnbe hwzv 081cz5aun9u/0d qp;e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is --l gozte/f 2nthe impedance at 10t/2oef z--l ng00 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 c4wtq) b kypu(.onnected in series with a 20-mH inductor, what is the phas4u p) qwybk.(te 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 circuit with a 200 i.ek1ad6 z ox.1urun-mH coil and 1.0-mF capacitor for a16u ixu10d ar.ze .nko 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 100-W r.qrt :: jxl2vgesistor and 15-mH .lvgt xj2:q:r coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a wgumyxocz 27n+d/pa 7.p4vkte af1-; total impedance o 2t-ok fa n4;7pd71zcuwmaex/yp+g.vf 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 5jxw-d1/ *qs6 mqo) pn hi.h-moasfh6 series with a 100-kW resistor at 1.0-MHz for a total impedance of 15o)sw-ih* h.d16oh/ 6 fqa5qsxmjpn-m0 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 tmow6l,v2/ 3;,* dpxld wncf swith a 20-mF capacitor. What is the impedance2m nxf6po; cls,w 3/ld*v t,wd at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.c2,wo c c*y51dipbkw .0 kHz for a total impedac1pbiwwcc,y2o .5dk * nce 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 serlz1pzr,o4utv. gv9j 5ies with a 10-mF capacitor at 1.0 kHz for a phas9.,tp5j rvogu4v1z zle 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 1.0 kHeo+27 :pcd lzvz for a total impedanc7+dvl:peo 2 zce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What hg+8pf3( h -kmm*oei6b 6pzweis the phasez86wgfhb 6-hkpim+p3(oe em * angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0mc l,) mszgo yn8v57owk4pz7m1m*gy . V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF caz *wgml k1v4mcm)7. , pmyno57z8gsoypacitor are 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-mFtf /dukbie1 )9 capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in tk) b/eu 9fi1dthe 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 6m ;fbk0a;acn W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?k a;6am;b ncf0

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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 circu2or(t* kj v+ydit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup+d t(yr jvk2o*ply?

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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 seri7iy:ne8.0egi l7jteqes with a 500-W resistor for a phase angle ojq:7 l et0yiieen7. 8gf $40^{\circ}$ 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 fru z9pn3jagfgn5m,,w0 equency should the circuit be driven in order to have maximum power transferred from the wzgj0g9p3 5 an, ,mfnudriving 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 wimnhulev8/)do+0)cro th 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 suppno ch e) /ml8+u)rdo0vly?

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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 o vaskj1hp:i+v6 c.wb (m.vxc r-;pq: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 haj f rebqkj;g:ao hw4, qh3,-l9s an impedance of 60 W and a resistance of 30 W. What is the power fachhw9be of jj,-:g;akqr4l3,qtor?

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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 k:c sj53:e ftkss* mfi+05uiaresistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to ss*cm ka+i :k5sfiefu j3t5:0a 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 capacib)lv dr gyf gj/zor 9nw6*c5t/dr;o4;tor and a 15-mH coil in series?nb5 t*ov /g ; d6;9jrlryro dc4zf/gw)

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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)+c-le (lg5zj 4izilx in series with a 4.7-mF capacitor for a resonant frequency i(l )xj4cgiz+zel5l- of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in serhr; ;8wnm ht xbl,;4hvuuw )8ties with a 3.7-mH inductor for a resonant frequency of 1000 Hzwhx ,h)tn48;8lrtu h; ;muvwb?

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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 in9w stw m8x)c7.l6kt py series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to b8 .ycxk6pl9) 7w tmwste 1000 Hz?

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