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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magn m1qq,pmiv uho1n0x8+etic 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 states4 ade 8)t e0-uwnzkc+r 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 j g a6/ ugwd4xth 2;yv gr;u)9;s;kymdchange on the induuy4a;vggg2 kh/;x9jrm6; t;d) sywduced $emf$, 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 o-r wz8y5 kytbzjdz;. .f the magnetic field through a loop of wire produces what kind of change on the induced jz5; . -wry.z8z dytbk$emf$, 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 gex+a,d7e1l6ey7 lht3oz c- j kind of change on the induceh+ 7ze y7lo,3eca ltj6g-ed1xd $emf$, 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 swj(8txl5cfil xx ,- 1an $emf$ 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 dirys.cv3lp1f nmdqg+ 2f-k0 jq1ection of an induced current in a conductor will be thatq2g0+lm ffnvjk1.-cyqs dp13 which tends 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 on a horizontal table. A bar magnet is heldxsf *9q.qo-tyajbl (0 above its center with its north pole pointing down. The stationary magnet induces (when viewfx(9lt0oa *-by.sqqj ed 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 tda1d2qs. d0gtable. A bar magnet is held above its a2 q0 sd.dtg1dcenter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic f,x qeat 6s vndug a8v2z8tz 0,qi*)5avield vector points straighta6d e 0,*tzsazvvi8qvnut2q8,ax)g 5 up. The magnetic field vanishes suddenly. 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 wher( - jttyq.xt:ce the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil (. cxtj-q: tytas 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 tablemr3km(c .ayp) -qur g*p0ty0f top in a region where the magnetic field points straight down. The magnetic fiet)up0garyk( r-m myq*f 3.p0cld 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 andm6 ohx8 vmpal bk292k, carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abo l,6b pmx hmv9822akokve, 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 pocm, 3hk-c8qu:+3h jd:hvaah tle entering first. As the north pole enters the wire, the induced current will be (asht3cm+3jah8 ca kh-,dhu:vq: viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who mxm)9*b54et w2f uek;1- tserh sbgf9se direction can be varied. In a region where a uniform magnetic field points straight down, what must b tk51gxwsehm)f49-t erm;2s b9bfe*u e 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 constant angular speed abou:lte:luqr8 e i* m0(dij6v jg,t an axis whose direction can be varied.86 l:u l mi qirjt*0vde,g:je( 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.ioyy *aopd: h*( d73cq ug9di+
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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 o bv/s:t*u9pl $emf$ 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 magneev*d* z .j7hmatic 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 (or1c r1 k-jiq7udiented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concern 7jd r1c-u1qkiing 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 i )m4wtd1iym8xmie/4constant 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 generatobxa y;7;0fkqso3gg 09omw+gar transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secon7kmz h*+f5qc gysskpq ;d:-1f;;k onnd. The frequency of tss 7 znh kqf1k+yno;5 gkf;cd*- q;pm:he $emf$ 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 toybo-qa1f1at)( dup8 5yhcp 2a

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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 deviun6*woiv2 wj3 ce 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 thbotrh8qz k7by6u , ;ad0e1l u48vis8 he secondary coil contains more loops than the primary coil then itb70a h oshd4k8lbuqz i ;u yvet6r18,8 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 seua 5nvwt0r+cunp0v4v1or3l 6 condary coil then itvvu5w 0nluo3nrar4cp6+01t v 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 inpu +0v:de; krt zbmwi*t2t

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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 circruuf8y 3sk(i gsa,8 -zuit,

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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 of cons;un1jr /zp :bbtant terminal voltage. At the moment contact is made with the battery, the voltage acros :/ru1nzj; bbps 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 s5d4wsdt) 9gq bbpx2 n:eries to an ideal battery of constant terminal voltage. At the moment contact4tn9b sd:5xw bdgq2p) 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 resistance R is connected to4 gp/.wj9ra yz 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 Rkgpb1)h q lbty6 z8aq+8r ig;jrd15f(: /fbz s 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 serie;2we9qvid0 ofd- i:tys to a battery. The time constant for the circuit represents the time required for 9wd:-qtid0f oi e y;v2the 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. Thncm 4/m.+z zf3hbm/ zie battery is suddenly removed from the circuit. The time constant for of the circuit represents the tcz m .43 h+/zmnm/ibzfime required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units eh/f( 6p vhtpw9k:bik)cgc;a.xcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cur/2mq v ah4z3aus4xry7 rent

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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 supplojquqmd0(/y0bgk x6pob:6. oqyr ol4;,) xch y. In this circuit, the currentkbq )o ro:oqyg(q c.0x4x,hp;d b0j/ly6uom 6

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan x5xv34(xge,aa/edgj ce in an ac circuit changes by what factor when the frequency is g5j(e/43aev,x xg xda 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 inductive .6mij-zj+o ax reactance of tha.a -jmi jz6o+xt inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the 2 n 6ajrih.cku4vonc; ww6:h 4inductive reactance of thah2nr6 4an: wuw;o6vi.chj 4k ct 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. Iiuv zz ftaz91(.w5ffc y)h6k 0n this circuit, the currentzyt5)zfaf(ki0 6 . vuwz1f 9hc

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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 whaa( p1 vqqt)0dfz06wokt factor when the frequencq0 1 tvafd()6qwzo0pky is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, tp/h:uec.pnx 9ci7e l1he capace. :e7ixpu h1p/cl nc9itive 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 be;/+ qawu h .uvye;/b2hb6z,8wq rvfxqtween the voltages of the inductor and capacitor in a RLC series ci x yhq, ;qu u+/6fzhrewba;v v8/b.qw2rcuit?

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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 atmdi-,i p1o)rn RLC 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 R inr-k +qo 8yujh)creases. When is this s+yhj8)rkouq -tatement 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 cir/;zqq cao/4jqvah s2 :cuit 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. The impedance of the circuit increasm*kq42/v k ma6lspo6ves if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC ser2q+ blr xm p6s(is0wq1ies circuit, the resonant frequency of t + r2sq6m0xliw qp1s(bhat 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 x46mz51toguk e)cz/b is driven by 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 occurs when /otpbd z cyt9o;+1k/s

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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 ;jvc4)v5gn*y-npbdeis rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo-)5;4ypbne cvg vd *jnp 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 in a uniform magne x;mjvy02ta0p tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpejtx0 2 ;ypa0vmndicular.

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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 unis-y-p orug 7o0 v.ta-kform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plpags7-o.0uvrtyk o --ane 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 adwfjzbqaa8 -h5: hz bu:j+zf7/::efuqjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cdmzh2t6(s 608sn. ychlnh8q phanges 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 l3t8yo uhl7f47q lg(w cm. A uniform magnetic field is applied perpendicular to the pl8t7ylfwlo37 q gh(4u lane 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 wirrs .3hhcehb3i./ g g(th 15 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 wcm6hja 3uf)myi5,;u and 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 horizontaldkc8 5f96 7cv-zttf i8*y sw*vs4ljatly at a location where the downward component of the Earth's magnetic fie8j 4 s -fi s7tc5avkwt9tyzl6fcv**8d ld 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 au8 m 0tpuk9c-cngular velocity of 2.0 rad/s abou9ckpu-0u 8cmtt a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionalronr (y5m/*aa area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tt 1 7fuauv0g)rurns 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 1*lm* hjbdeam rjz : 9oh6nj)gu/83 tt.2 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage nm* h/93: d )6.rabjjejgtmz*ut 8olhof 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 100l/stta h)r;8r turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 V k-;,p j .qjdxmmaximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is p.xjd j;k,q-m$100 \; cm^{2}$, 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 genevf ,ajjtec; 7928)tbebzq1h g5mn4 qv rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motoymh*/2*i gbtry: t7o9u6zqyfr 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 resvc,8b1 wxk6bsistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it 1s6bwckbxv ,8 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 ,;mu5 cv c:iqtis connected to a 24-V power supply. The operating current is 1.0 A. What is the start-upc,qtc i v:5um; current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power ol91ejay n vk(+zn2 (usupply. The operating current is 1.0y (j(l 2ezk+v9oaun1n 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 is connected to a 24-V power supply. i00pg mi,1b8a uhtg n4The operating current is 1.0 A at fu,4t iuhnm8 0gp1bgai 0ll 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 primary voltage o .5/yagi2o8e-ko tinn f $120 \; V$ 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-ture+grfi;h/p2q n primary of a transformer causes 14 A to flow in the secondary. How manhfqie2g/ r;+ py turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if t3dsxd 3nfuj4:s ogf7:kb t2 4ehe 24-V sec sdu4kbod4:sf:t gn3ej327 xfondary has 100 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- mv-x0nx. ihe5xcn7 1dot.*d eturn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the c m0.t1h57nd -xn x. eoid*evcxurrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer.+f osf7thaztb3k1z3i k1 hoo) l.4u0y Assuming 100% efficiency, how many amps t4ay+t1ok fh1f30.z7ois3l kobz) uhat 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 ne1x;hat z ml3m+on sign transformer provides 7500 V at 10.0 mA. The primary c1 hxmt;+l z3amoil 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 coih qyz(k1.s gh/p.moj6(ksd5yl 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 secondar djsy 6hy /qo..(skphk5g(z1my?

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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 ibmf),n 9asd 9wl.mr.ta d9 3sits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary f)99d.wl ,rsnm3atim sa9db.?

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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 secondary has 200 turnsh pqv2ma1i*j-. If the input current at the primary is 100 A, we can expect the output current at tamvj1 hqi2-*phe 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 secondfmkqo*g( 7l5nary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondql75 k(g *fomnary 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 seco0u 1w8eg 3)dipli7tle5z )nbsndary has 200 turns. If the power input to t8g)1p 0zlnt5)iulsdieewb 73 he primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A -wxm 4u/su -loof current at 120 V. The voltage is usually stepped up to4/xmusuo - lw- 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 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 6.lqs ty9cvt 0* v6i:fk0 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 transmissionqkcvlvt s9y6t.f*:i0 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. The voltage is usually steppeg gq,l)wxs.i 2d uqx,sig. )w lg2p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if 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 z s;q9q9laz b0 ejcibo-00y9 ghas 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 transforme990 cy0i0 jqq -abez;9bgloz sr 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 resistanct9 d3pqch 7uktn4ol4 (e 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 ofc4hqoln t (3d k97pu4t 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 l)vm6+heepa8qpv h(g9gb48 tp ine at 1000 V. How much less power would be lost if the power vh98m)eq pht+p gae84p vb(6gwere 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 fqkb/ g-a)dl/ 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 powerf/l)kba /d-q g?

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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. Hu7bn jfw)+ +1uoga5wlow much energy is stored in the coil'fjn l1aowub+)g+w57 us magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W rer :ili7gh;5gunebw. 2sistor and an 18-H inductor. What is this circuw re7:i g5b2;hl .ginuit'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 )msqt jj/-x,fwhere 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 q5 6*uh)rqkc npeak 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 o vzb8o) )+9y6r6n/ gyry s8/k aaaobuof the lamp?6)yr k/a syo)nuoa b+ya /g68rvb98zo

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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 connectedpwjm8) d mp.e*-yl (ed to a 120-V ac power supply. What is the peak current through thded w 8)py-eljm(. p*me 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 ac power supply. Wh td.s 8)qmfp0aat is the power dissipated in td 8sqa.)mptf 0he 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 ax 5f6ffecn5; sf0 jmz,v ,.lnresistor 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 uz 8gkw /;st j+y43qjqaer.(kresistor 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 resiio5 +5 4w ohctm44bz;j vybua)stor 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 60 Hw3ihfocyv3mj 3 z i:g.u6d)k i70rt j,z?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivef ihv, *)y,i8tdzu ,v2o6vcr j reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil hqyl q9ri0rip jz9(/- )r1 y4qfb-vhzwave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for wdefh62 l s+y o89k.s*c9lh/uhs+uv e 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH induct:5dyanau gxavs7a h8e+d5, am0 z8hf3or when 120 V AC at a frequency of 20 kHz is zdg3 yv0a a7,:f5eauxm 85sndh 8ha+aapplied 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 110n1w; di+jif x;9s2oa f-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH4mlwn qy ,3fft9(r 6.)qztoinzf3my) z?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance atc1bp0b0s mq52g 6j fbv 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 ,r*(nm;owf ldcapacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capaxtb)i(gf(ji)mec () ffc4 sq:citive reactance of a 0.010-mF capacitor be 100 W?fif)jtq: xi4c)( (b)sfgcm( e

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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 and 7vdis)4rh w, ic-kdt+ 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 3zj :r9 fzmyu3W inductive rj3mzyu z 3rf9:eactance, 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 1.n7 :qjxfi9n-(*q:hxs w lu)jv0-mF capacitor are conq xhl9-:jj(f 7xqusn:*i) vwnnected 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 co h(h+gphmwn(x6e9j3)z bdd, bil, and 1.0-mF capacitor are connected in ser6, p 3m +hhxgdeb9)wz(n (hdjbies?

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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 yas2 obk4sym 34h;5a ak5kaf;connected in series with a 20-mH inductor, what is the impedance ya4ay sk asm f5;ka o2k4h3;b5at 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, what is 63 f2x3chpiitdb0g1xkw y +q4the phase angle at 1004d3i1 ckbx2f gpw xy+iqth3600 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 and 1.0-mFv :yk//n)sj kzt/ opb5 capacitor for sto/b/)/ k k:zjn vyp5a 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 wip: +gcxav /,ip:a-fuqth a 100-W resistor and 15-mH coil to g ip-p:u gq a:x/c,f+avet 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 r5suzn s8nk 99450-mH inductor at 5000 Hz for a total impedance 9zsn u98rnk 5sof 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-krl bk( p6b0lh.W resistor at 1.0-MHz for a total impedance of 15b(6bp .lkh l0r0 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 connefvw hhgay1fa 76t,)vhj/ 9jq*cted in series with a 20-mF capacitor. What is the impedance at 1a )9*hjy/6 1jffgvhq h w,t7va000 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 s vh.2 z) *qsvl/t uoi5n+g:xsweries with a 10-mF capacitor at 1.0 kHz for a total impedance ofln)it:wvv q5/h+ 2oussg*z x. 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 neede;vl8nqv q/0hd2j3bxs4g6ky .nfpjp 1 d in series with a 10-mF capacitor at 1.0 kHz for a phase angle of q 2 ; nnp gjhsbv 6/xyk04p.fj3ld81vq$40^{\circ}$?

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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-s )gaqojvj3i*h,cu9(2ct -r jW resistor at 1.0 kHz for a totala2jr)ci,j os3 v c-uq* hg(jt9 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 atctemg+x s+t-8q (uq4ott th99 120 Hz. What is the phase auo9(tsqgt q8t+-tmehx +c4 9tngle?

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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 Hzqy7dyonfy.t j l(.z01 :2 cvsi if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar(oysly :dyf2 q.ic v znt071j.e 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 *x28 eeokj dg)resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The c*g d2)e 8jxekoircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductofqg w+1 2:aiogk 72 pz/mezt8dr of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit i t7qgmezg kaz2:of/ w8p12d+?

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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 resistz ; hw.lu(ya4t xc68owor, a 10-mF capacitor, and a 0.45-H inductor, when connecto4w;8 haxtw .zcu6(y led 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 serie)pqbx+z* t 3mvs with a 500-W resistor for a phase angle of3tqpx+v b mz)* $40^{\circ}$ 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 frequeh 6l4q0m ldy/yncy should the circuit be driven in order to have maxi6/yl my4q0 dhlmum 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 ccfewjh/w e8;u89*ud uircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0euw/c9fu 8 u *wj8de;h 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 an AC circuit iqpv+w z ef7t3a b41f0ms $63^{\circ}$. 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 o:ojk4g4 w51asq 0 zo9o2w ayoaf 60 W and a resistance of 30 W. What is the power faw442gqaoo9 za5 oja w1k:oy0sctor?

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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 faiq( .afeowh:dy3 4tp1ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pdf4i1q3 a pw(.h yto:eower 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 f;+g1a rrnpzv;p wjq48 cad x13requency of a 1.0-mF capacitor and a 15-mH coil in series? 3z;4px1wvn a+1a ;dcjqp r8gr

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant f-kd7 dci;i 0lkt4+asw9ersatx (7 +rarequency i7st0rtcd9+s 4;d 7lkxk(-+eaa airwof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series 3dvs67:nrvn3u, doc uwith a 3.7-mH inductor for a resonant frequency of 100nu76s3nvrd:v 3odc,u0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in sru6e+ gk,g+p7lqgvt t6i j -,reries with a 30-W resistor and a 40-mH coil if the resonant f,e, -rg6gt rutjvqi67+lkp +g requency of the circuit is to be 1000 Hz?

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