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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 c 2dhfrh-nles6bhn 1(5*a w :sunits 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 induction states that z6ek.ij3*jwc 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 ch ff/)i )b5cdpwange on tc) )fwd p/i5bfhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magneti*trkg.lkxmc +fo9.y, c field through a loop of wire produces what kind of chy,gk*.mx orct9. l k+fange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ofv wovkn(;e7h74p,ctx change on the induwpkv x4oev7nht,c(;7 ced $emf$, 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 removedaa u2(i8t obh+ from 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 dir-rwv tg*z,si; ection of an induced current in a conductor will be that whisiv t;z*gr, w-ch 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 6ak mcv4 u2e w2gce92vhorizontal table. A bar magnet is held above its center with its north pole pointing down.eka6g2c 922vwcv em 4u 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. A bar magnyvx ;igk s)/v8et is held above its center with its north pole poi /ixvvy8gsk ;)nting 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 tabl ccgmt(iwj02l+zayz:-)nr w + e top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cnc zgl +2trja( 0wcim)w-zy+:urrent 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 the mjx7 xk 8rjdp;kss( 8pa3g u./fagnetic 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 as the field increasekpjp uxk( a8/ drxsj8s ;.gf37s?

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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 horq 0be/w * /g3j zf;cgdqt42rtpizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directiondc ztt rg2*;/0qb 34j/pqwgf e of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an evers * ez,eie:m4,6 pnihy-increasing current northward. Two coils of wire lie flat on the table, one on 6h*ms:,ei4 p,n eyiezeither side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls throu zol*n/7s115cewkatq)so+qjx m *fe) gh a loop of wire with the north pole entering first. As the north pole enters the wire, the inaf7)+t q1s l1*sw koj oemcnq/*) zex5duced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axirkbbhx 9vn ,/plq38aa.d /sn)s whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ori,)nkapb38h.xdrq /b v/sl9 na entation 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 sp0j( v8pjsz zxja3 a40peed about an axis whose zs 8pja 0jjxz03a( vp4direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.w1 4jv3moj.yz
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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 thg:2h w ft-3w/; si -zym2zjo;mh)hlxtat 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 magnetic field. The q*wct)6it.gfv3 vt+f 8f plm+ $emf$ 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 nor f.h.tzp,qih h4ki41cthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rok41 qithhzcf..iph4, d.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velo +5p2auuky1ojipd rx 90 x 5qaeh0vq;;city $\omega$ 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 -eb pto h. v9.nmb/gp8transforms

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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 second. The freb4fmk bb(j 6u0o3) gwzquency of the wb6f kjbobg(30)4umz $emf$ 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 deviceptytt9 (i: y/k*l-qjf used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a deviceu ., e3zlu. kopb flun)w6r,(o that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primp*9* q qlvdwhl:debrj7 ;) 1exary coil then it is9 *r7deq lb*jdl)p: h1xewv;q 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 thanuo 3yy9a,unmum6 q5;b the secondary coil then it 9a 3uum;nu y6oq,yb 5mis 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 e f.s-qvyk4r2power 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 circuidk8z2.w pg:bnt,

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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 -2, lkpnp5 stsof constant terminal voltage. At the moment contact is made wis-ppnt, k5l s2th 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 idehd5xpymja -q7y(e7 7d al battery of constant terminal voltage. At the moment contact is made with the p m7ydajxed5-77 (qhy 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 s j:n+(suci,ml0d(i rR 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 is8 kdt d2qb;78exo-h rj 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 selbo98o q;1nzvtn.jgi6o 21cg +h6i utries to a battery. The time constant for theqhol+ 6ou9t2;i zbcg on.jginv1 61t8 circuit represents 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 ser* :aftze9-0aad tt v*h,i16 :bh dtuyoies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fottv *f 9,ate -hu0b6daza*h :i t1:dyor 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 excg tl7h ybxyuudx7+ +u;e/k )8fept:

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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 suppl1u:jb1f2jvnya ytev 0li *5f-y. 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 anx6( wr6nsl2fa AC power supply. In this circuit, the currens6ar nx2l(6fwt

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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 wr-1 e09 g-fsgdwc ch8sm)pi9v hat factor when the frequency isw-8msip 0r hg9v) d9ge cs-fc1 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 ,d(glug;( f2x jjwl+v 6u f;maAC voltage across an inductor is doubled, the inductive reactance of that induct(ldgx 2 flfjguw amvu(6; j+;,or

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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 inductg6ihh2p( tbw2tne9z l2qz 4 9qor approaches zero, the inductive reactance of that c ep(2hz2w9qi h tb9gt24nlzq6oil

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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 cirzd yo11bn 57awcuit, the curreb1wy 5dz 1on7ant

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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 when the freqh sv0*l. rq5yeuen.0lr* qv5ye hscy 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 appro36 qqm38sqrhj c 11wgeaches zero, the capacitive reactance of that capacito j863heqq3 c1qw rsmg1r

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor )z a,rk:w*oezand capacitor in a RLC series ow rke*a)z,:z 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 defined as z3 xs4f2sxz.oont, dy9q(5nq$\cos M = R/Z$, 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 ikzxut//jv hvar)+3i:f R increases. ahuz+v ri/3 xkt/:v)jWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ofz u/mt jt//c kp; i(udrj j:uj2*qt7-a 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. The impedance of the circuit increal6ro:ko;zk1qls* 4vfses 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 series circuit, thlp47; ywk ;k:-pxocdue resonant frequency of that circuit pc;u;7w lkpkd4- xo:y will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applu d.h; qqd )5zgcoh*e 9,nyd,hied 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 circuiuxf, ,eeie2tn94xkg / t occurs 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 rotaezi 4s 0i3j;.l bcoye)et9udqc2m -l 7ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f73m e.ocj2ild z)uci-9 e4l0 yt;ebqsield 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 radiusi-v;d*ya8 nwik 1nhaj09 *q f.d3qnzl 0.10 m is rotating in a uniform 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 perpakd-y*9nl f.z0;iiw 8 hq 3jqnad*1vnendicular.

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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 rotat6j9k kxy-gmyog6/h0ging in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop w 09x66-/ogkyykhggm jhen 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 reddm fx (u-a2a( w8ml:v+ 9bswpuuced 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 changp o6x6nud, n/pes 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 el6by.h 0 cot-tnl*e;1hp us* a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to thte clp.6y -h*lt eobuh*0s1;ne plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an adfbu/ b ujdj54e;u*g+rea 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 78.c0 j: t7xwzc hxlqtand 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 nclwy1s x b1 +ltdhp;r +zveg-a0:3t.horizontally at a location where the downward component of the Earth's magnet31 -xtbevw0d+lp.sc nt l +r g;hzya:1ic 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 qhu i8i.ujh(2 a constant angular velocity of 2.0 8hi2( qiuh.ujrad/s about 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 uutm1hg lmu(; ;caf.*+5k( x uhz9beecross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns:s.i 2 aqeqm.7dlh7t*s)1t48zi gqsjou m -lg 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 lnfpotcs z,; xucsw-)eww96 64 3gxe z:ong 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 ou,e63o zscsg -;)z 6nt: w9fwcx4wxpeutput 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 ;wt/1zjs) d t+2y0lfphz1tobn )6 wxwturns 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 simgg5g*3r:u-asmi+ fb hple AC generator with an output of 12 V ma+ 3 :5rgfh*s- aubggmiximum when rotated at 60 Hz. 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 generator with a m 1ri ;mjwh*utk qfmde8;p5 s75aximum $emf$ 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 ree0fseec4 jc5/y sg 08zcy3e s5sistance 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 i qe;h:(r;xn5k w ; hkvq2fgc0a resistance of 6.00 W. The motor operates on 120 V AC, and when riw 0vgxrn:;fe; 2c5 ;(qh kqhkunning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistancerc r0a q(fd79v 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-upr0qdvf r7ca( 9 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 conn )lm0i .(( eo;fhbkf8nz gbnbb/:6 ut +nyynf.ected to a 24-V power supply. The operating cuun.6z;yn l.ft (:) y0gh bf+8iob(fmbn ebn/krrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc(gqw i;z4fj. tetkfz2 /avg,1e 6.0 W is connected to a 24-V power supply. The operagf/k v,tga(i4feq;1z wj2 tz.ting 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 q;ic.g7, m(w+uj hq)cli)mkd is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transform3dl3yg lg. mz;-gt)oyer causes 14 A to flow in the secondary. How many turns are in the;g3 3t.l-d ygyzlmg) o 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-,jk*isrk 1+mqe9l+ 1ef dp9 vwhov8)aV primary if the 24-V secrlq hvse98ekjdvf p9w ++ i*o1kam,) 1ondary 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 aucr5.2gy n-.afo - m7 xf.hwzr 500-turn primary coil and a 2000-turn secondary coil. If wno.fx7fr-hgmray5.cz .2- u the current in the secondary 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 the primatno+/e1wlbgt b:q x z.ps*h,8ry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in *wtqg etbsx+b :hn p1 o./,lz8the 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 mA..2 / /unzdr ls7ubbeh1 The prim.lu1ne /2/s r bubd7zhary 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 coil and 3+spqc - 4 +0svvxe.sd9g kj, m6ebyw9 idf0t-b00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltasv kqw+gbxe-.psc- m 0b s0fdvyt6 9di4 9e,j+ge is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coi- lkb8xggg*b 5l and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in tlkbgb*- 5xg8 ghe 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 t 29+1c )m sveop i)snajttej87urns and its secondary has 200 turns. If the input current at the primary is 100 A, we7a )spne2+ecj9itmjt8)1ov s can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns2 3b 2chxulvsy0u4s:xkqcah q:):np e1 s/l1 o. If the input voltage to the primary is 100 V, we can hsqsl b h2o:c1ulay)xvs 4qe 13 kpucn/2x::0expect 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 transfor6 u+(ljxd.xklmer 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 t ulx(k.+xd lj6he 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 120 V. T,r .,b cfumglh*vg6;nhe 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 thehgm,ulcgb ;*r.6n vf, 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 o)8xu 9v5mzu7 aia j; xiiis*)t/imu 2jq)jq b/f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lmu)ix97tximjj8/5*q ja )su)bua 2z i /i;qviine of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120i9v.qx0f p,b(dc77rncf o4can1 xa m4 V. The voltage is usually stepped up to 4500 V by a trn17cacb09npx4ai mdv x,rqc. 74 (f foansformer 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 has a total resistance of 0.60 W. A generaanjwgd* .9dun 6bw,j s e3.su6tor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppedju.dnjne6bd6saw. u3 ,g9s w* 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 *xh3ic+yp/ 4gu o7ndxwlw:;uW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is step ;7xpg *ilywx4uou3n :cd/+hwped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less8 gi8wlu0 ikh8 power would be lost if the power were transmitted at 3888iwh k ulgi0000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be trazwq bb*pxhx h*/ d/n69te/)dnj s5py +nsmitted 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 tranx)9/q y+hnsbd* jpe/5 *txb /6dwph znsmission 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. Hoq pa *.h/wbicl 8f6ns0w much energy is stored in the coil's magnetic fieic. 8wfh06lpsa*nq /bld?

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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 cont+r6krqs+y i7om8: nttains a 6.0-W resistor and an 18-H inductor. What is this 7y8 m:tr rtks+o+n6qi circuit'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 wherezk ctup q295m(zl+no.,n sf (a 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 4 t31m5j3(+i wfqj o,qt v5cq,evfavp outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What istg-u1 nl9yo t( the resistance of the lamp uy(o1lnt9-t g?

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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 tv uy v ke*q,/x( m7ds7rcyk;.supply. What is the peak current thrd *c,x;qy(tv.kvy7 s mke7/urough 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 a7rs,jix. 75ovw.seuk c power supply. What is the power dissipatervx .ss ui,w5o77j k.ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 52 nwcqa12m(qfgp3w ska+nio : id-p37 0-W resistor 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 resistl yrc3qz6vyqg-1n 99 tor 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 9/gl1*rej7t0 p hbbfc 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 induv(gqp oy7w.-kctor 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 1000vhq10 va3ct( ejmzt -+poq)i 8( wbrr) 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 db5j8qpcv y 1rtbj 44:8k9dlu14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10006e f p5uumm,lwora*2, 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 frequency of wftygi 2 (0p+9egjxm- 20 kHz is applied to it ymei(9tg 2+jf xgwp0-?

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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 cocj2e4q, xa ; (xxjine*il due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH s6 i s6vrv0r/pac0oo3z?

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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 6xin7qc0xty ) 8c.zhpto have 50 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 4ki4 d)pny2ughave a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-m1 byx)ey2m 6)h8pvrja y-lvc* F capacitor be 100 Wvmb *v1jehlc)8 -)r 2py 6xyya?

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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 thro e4m/7 xublez++taz0(:y hk 3ryl;plq ugh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit yx et za.k-ch.) .pvx:m d3/xkwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?3 /xzv.c-t km. hyp:.ex a)dkx

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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; (pt;vfdz o 2c1n2vso Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are;vd(z 2; 1fs2cnvpoot 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, 20-mH coil, and 1.0qd.j8 3ua 0qao*i c:bv-mF capacitor are connected in *i c .q8ua 3vd:joaqb0series?

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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 inductor7a ji16x5ikesfrw 3z6 , what is the impedance at ai xj6ef1ir3 sz6w75 k1000 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 conn*/lrv 2m.u elky(( cttected in series with a 20-mH inductor, what is the phase angle at 1000u(*/l mr t2.c (ltyvke 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 ar8h5 hw7 )fjengh6aj- series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 H)-j7e6ah5 njrgfhh w8 z?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followin8f oiqf jr;v4(ibte ;1g capacitances is needed in series with a 100-W resistor and 15-mH coilii re4;;f to f(81bvqj 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 se u-pnhx/,6(zi-vim series with a 450-mH inductor at 5000 Hz for a total imun,/p im- hsvei-z (x6pedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a to/h(ey bapbx8m (n ;j4dwxfdh:y+l57j tald;xy (/w 5fp b8:b hj4jlh(a7ey mx+nd impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What isphqx ao-o -drg:1ok -:eb-g* s the impedg -pdreb-- sho*g:ok-a: 1qox ance 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 1.0 kHz for aay(6xq) 4 dg zoj5oisl0 t 5dxek:r93b total impedance of 4b a 9gq)z (5:oxd k4eid6yolt jsxr0355 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 sex b g:e3 6o+-c;dqcuxtries with a 10-mF capacitor at 1.0 kHz for a phase an3+xuc:ogx6 tqb-;c e dgle 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 zdh1 wsjz.f/ rp03j 7m xfj48ni+ r) 2b0xrpihseries with a 30-W resistor at 1.0 kHz for a total impedar7j/fpi0hdx2)z pb30 jn zx+ihjrw.8fs1 4mr nce 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 se 3milben(5*: e o7phidries with a 100-mF capacitor at 120 Hz. What is the phasei57m n:e *i(po3lbhed 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 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0:9m/e 8ei7aylfwb x( t-mF capacitor: a(exf wtie9l87by/m 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-mF capacitor,)pyljmrs92ue)w bo;pc+6h0e l q/ 3(rizuq l 5 and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the js 3lph e ) luqr6)w(u0ryq c59bizl p/o+m2e;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 reactan 5hpbjl4gm0 /bce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz p g4b/b5m0p hljower source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circs uupa+w jo1oo+* 0)qcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a +*oquw sa)0o1cujo p+ 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 neces)3 rm r br2nevk;73jyv( wgzj8sary in series with a 500-W resistor for a phase angle ofz32 r jmre78;yvv wgbk( rnj)3 $40^{\circ}$ 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 =)lpti ha( zp)9 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be drivliztp9ha ))(p en 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 c,7wu za;//t 9ryfurr k,dkh w.ircuit with 12.0 W resistance, 15.0 W inducywk/f.u r9k,t,z7;hd r ra/ wutive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ciw,fillh *0 , c(3yiaflrcuit 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 rokud v ;4kn*3zesistance of 30 W. What is the ; vzknuk4d* 3opower 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(q;ftm,zkit6 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ifk; (6 ,tiqtzmnductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor f.)kgjvs ,i-z and a 15-mH coil in series?i-fv js.gkz,)

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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 with0ldg;zi4utpl jh ( h2va-ob*; a 4.7-mF capacitor for a resonant frequency of *;i t0uv 2 gozh (llph-d;ja4b10 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 wwo:k-x2 z(vg x/k k)w+kmft2xith a 3.7-mH inductor for a resonant frequency of 1002wg -:xmwf xotz(2)+ xkkkk/v0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W re ds: 0fke 3isp.7guk,qsistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz? sged7f , qkku3i.:0sp

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