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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 magnetic fluxw/vhq) 0jwt 5z 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 thecr4zn wd/e10q $emf$ 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 chang; ;3dwzyt .gc7jdhxy93x3is he on the 7d 9x3.dc3i 3hsh;xzj t;yw gyinduced $emf$, 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 w ,bk(kx33vj4 im.z8sihh -bmof wire produces what kind of change on the ind k3ih43 ikw .jv-bsmzxbm(8, huced $emf$, 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 . i)msxox5rb i g8y,h;a loop of wire produces what kind of change on the induc85ig xy)ob, .rm sih;xed $emf$, 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 fieldd1m2k-mylc x 1 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 wv j2k/fo3ob: direction of an induced current in a conductor will be that which tends to produce wh2bv /k3of:jwoich 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 held abovef mfu* f)d; 4 vr-pztd4 hoqoy621,lwq its center with its north pole pointing down. The stationary magnet induces (when v om 64poq)-f4hqlw,fdry dv;zft2u* 1iewed 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 hoj*qv,v: sdqf: rizontal table. A bar magnet is held above its center with its north pole pointing down, ajqqv:fd*,s:v nd 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 thi17r7*ht bcs-:y mylte magnetic field vector points straigtly7 ricyh*7ms-:t 1 bht 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 sh2z pmb28 uw9top in a region where the magnetic field vector points straight up. The magnetic fie9u8 s bw2zp2hmld 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 horay f 3.qsbitl1i5; i;cizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the diresyi; 3qc il ia;ftb.15ction 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 agb,ueg 5evlqt7 +n,2j n 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 current cinvg,j u52e t+,qbe7 glrcles

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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 0s1tt:*l:n - rrm1q5e8k yy hzal7xppwith the north pole entering first. As the north po-x1l: y klyz5eqr1h8rp tnm *0apt 7s:le enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cohqti4j ;)gj5 qnstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowjth;q 4 i)q5jgn, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant aa zlu .6sj,uq7ngular speed about an axis whose direction can be varied. In a region where a uniform magus.a,7 6u lzqjnetic 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.boh:l7w w8rn;
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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 tn6xhn:g8ed v9lz :h8 ahat 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 fpqhbi -9r 9i:tknagpv ,vc gp00.g),sbe;r q5 ield. 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 ml:; *p34fyg ueoae-t-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make4to;luapg3e f *ym- :e 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 r1ktqkk g(y/4mm; jyf,s 6vx 4botates at a constant 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 tutd 3(ze)hyv+ ransforms

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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 freque:vuvv36bhh f*ncy of thevh:vv* hf63 bu $emf$ 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 devicevtrrp/x5depom+1 t 3;1v hw: n 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 d 3fq90n9b 7hbmoz9 gtjevice 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 morn++a2vcf+ cpvxug 2 g.e loops than the primary coil then cxv.v2ga2 pfcn++ g u+it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains morbh3 ;k p0e8kbpiw4c(f* q8pk f9 eea5xe loops than the secondary coil then it isi9ebk qw0ex kk epc3ff(*4;b88ha5pp 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 in20lzos+:xkbvj4l4j q put

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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 circui :n9cwpi.g-3 jyvevof+bw1- zt,

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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 con5 umwa4.wza-p nected in series to an ideal battery of constant terminal voltage. At the momentww-5 4zma.au p contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are co.e4)ltyttoa 4xuab 0j.lwu/; nnected in series to an ideal battery of constant terminal voltage. At the moment contact is ; wuelxj).yu 0a4 4o/.t tlbatmade 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 connect52apxxrde5o: 5( wufted 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;4ptzjbm:8 58agt xm:* bvmum 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 series72n cx,ro etlc9hx)+d to a battery. The time constant for the cire)tx 2 +cr7chlx9n ,odcuit 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 series to a battery. The bat:vgs/uox(d d63f(pjy tery is suddenly removed from the circuit. The time constant for of the circuit represents the time re:(o( fsd yu3p6dxgv/jquired 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 t4)*cm,ypoxyb9 +bxibk) rh6units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On to(ne04j t ls v.n,waz)his 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. In this circuit, t7:4-3ccaonkn a/jbh6 4 p bl0jfa2u fuhe curren o2acnj 0np3k/4b:ubu4a l7 -6cajffht

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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 cir n,zy cr8b1;yfcuit changes by what factor when the frequencyf8n,1r;cb zy y 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 acr,b/8j bb)nimy oss an inductor is doubled, the inductive reactan b/ 8ibynbmj,)ce of 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 ivr7oypmi g hr/63*xzdq.-;wk( ixd*b nductor approaches zero, the inductive reactance of thawyzg h/ i o; b3km*7vdx (-*rp.qrdix6t 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, the currecp1/ ky00d)h 3ew ds:cbknvc356 s seknk)ek svcn3063 b s0cey k/ w:cdsp5dh1t

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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 frequecli76 wf u39tdncy isul7d t69cw i3f 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 z0:cxvq-t i6r)i.k*ny wv ro u4ero, the capacitiqtoc. :)ivi*w0 x -knru6vy 4rve 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 between the volt ga.a96yx/g8od :ao dnages of the inductor and capacitor in a RLC series d 86 /ga.ay:x9odogna 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 defing/ g3xj7adktq)e; jcl;x g;7 dss90rt ed 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 , pld,pmxt.4lck2. v5ucc-a kif R increases. When is thi,pka5u .dclxmlv-ptc 2k ,.c 4s statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ikz xczf-e /;k7ncreases 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 increases iw-:qumfa2i3bg( 5 pmqf $X_C$ 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 in7 *b6pb4omd0 u6d0iyfo*ui ai an LRC series circuit, the resonant frequency of that circui7 i ubaibu0o f6dy*4m0d *6oipt 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 applied voltage. At resonanceegg6 w3b/ j3,a8vk hjt,

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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 whn,caj(p+ lul(aeb(m1 m;y c6gen

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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 rtpp4nb:6*am dwr) k th/*rs: wadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnwn ) *dw6r/mbsr4ka*p :h ttp:etic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fierr;pv;okp6u xdwa- ,( ld of 0.20 T. Find the magnetic flux through thovx u;,pa-rk6w;(pd re loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifoa5z( ap4yzvn 4rm 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 at an zp(zv nay4 a45angle 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)ou(w xk, ix/b/ hwhr.wkp/2v cck)a2 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 cyv. 8n uk iqv2yt(c3(moil changes 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 cm. rs f +ks3k+1dv6dq*ba A uniform magnetic field is applied perpendicular to the plane odsb6 adf+ +k3v 1rkq*sf 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 1 t3beo.xtrr*(9g4w ui 5 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 ana im9i1dxnvrg2is12 ee*0tc- s 96ryvd 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 horizontallbf1qoregl+g/s+is;s z*i5 t ,y at a location where the downward +t+ l si,es g;/obsz*rqgif15component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocityxk9envw9q myh /x67;qzh1z1i;. au a l of 2.0 rad/s about a vertical axis through one of its ends while in a constant mhz7 a;1;.we vn9h/myi xka61uqlzq9xagnetic 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 lurf** hbk+ih- ls9q 3loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of n vg2a2ytn(xgmdz/9f),m0 gyarea $0.090 \; m^{2}$ 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 it-r2-zqw7hl bq h1(zj:k-prds 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the-whq 1:-2 qzjr(rdhtklz7-p b 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 o8ubfowv+z qp.t0)0q bf 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 A7:.oqz,cfqr- e q2x;w7s xmd xC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isrxsx; m,czxq7e:oq.w2 -dq f 7 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 maximrvm2 ga*1 nk(eum $emf$ 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 motor operates ony. m6bsh; jmi5 $120 \; V$ 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 resistance of 6.00 W. The motor operates on 1o.5zt(b h vra,20 V AC, and whev, t .ahborz5(n running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. ewzw.20 ejz 10hdm5dd3t-a zuThe operating current is 1.0 A. What1z hzd e-w wj0meu0td53dz. 2a 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 0afr5z (c/uyx7(y;7ar wh(aha( ir into a 24-V power supply. The operatingaa /r(hw; ry(i(ax (zifhra570ucy7 n current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance kl 3k)/ql q)z*gvuvb*6.0 W is connected to a 24-V power supply. The operating ckvlv*zbq q )kgl )/3*uurrent 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 neejqc yg,xptrb *6txkw(p/ 9;o :ded 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 transformer causes 14 A to f/rd56pl4 mzer low in the secondary. How many turns are in the sec6 rmlpz r/e5d4ondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, hoo-7mtea up54jx 2zn.ei)cs:w lh- to, w many turns are necessary in a 110-V primary if the 24-V secondary mt4wjnoe.ztl s 7ua2,e -hxo) -:5ipchas 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 c q*,g3de0 b4dnggj d3a 500-turn primary coil and a 2000-turn secondary coil. If the curren3c0d3 ,dgbe* gdjgq4n t 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 primary of a transformer. Assuming 100wz8o+ vz dq1+s% efficiency, how ozqwsd+zv81 +many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer proersid 0o708hw usoxp26cv3 2 gvides 7500 V at 10.0 mA. The primary coil operates on0 6ws cisx0e v7hodg82o 3rp2u 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 hasx* d7+um5 evgc 60 turns on its primary coil and 300 turns on its secondary coi7c + g*ux5mdevl. If 120 V at 2.0 A is applied to the primary, what voltage 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 on0xd.jzj b+ix; its primary coil and 300 turns on its secondary coilx ;jb0ijz .+xd. If 120 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 secondary has 20c u pn(i*- q1t/xubf4j0 turns. If the input current at the primary is 100 A, we can expect the -*4qjcuf/1ub nxt(ip 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 transfor(gaumm5c+ 7i umer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sec(mc iuu+g5am 7ondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. i*n) 9- cep7vn ogf2rx If the power input to the primary is 100 W, we can expect the power output of the9o2)nxcv7 f*-pe i rng 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 curren-dq w+z kvhf-zd+l.h w1ml8z3t7i 5zat at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow8-az+d3 w mfwz tvz.-qlkiz7+ hd1l5her 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 60 A of current at 120 V. The voltage is usuallymjm,ly0f hz1v g ic-.; stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find theczg. ,y;-vmih1jlf0m 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 120 V. ou , +s 9r *oiy)*8wynnyjgipxm8w f77 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 f+xyjis iy*) 7y,mo98r w nuow78n pg*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 12pp8l p2lc +v z 5c/q.zvsdivof 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 volt.z+v v pzp c5il1p8vds2l2qc/age 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 lor3al d.4+qssmtuaq6tf w3++qt1v a4 ine 50 km 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 ratio of 100:1. What percentage of the originalvtq3+ r4wua l6t3+ d 4a. qofa1sst+mq 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.x/v uvh-:d *az3pk18 3 nhx4e3t1eq7tkhqnsu How much less power would be lost if the power were transmitted at 3000 V instead ofuehk48ttx7na-vu31p3v snx hz:h1d3kq/q e * 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 Vvivvzc ycl khv*7c6z 35p8r3( 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% o5*k vcvcv (z 3i3ylc7rv8pzh6f the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy q;x 2:bw.8mbtmh*car is stored in the coil's magnetic fi m8bqc;wrbh m t*.2xa:eld?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an lcm y/r:7hrwa ;a0a q318-H inductor. What is this circuit's timeahrr7 c qal0 /3:may;w 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 circuit6 g8xxev/ dkm( 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 120zh9p6qze0nhmkxu6 17 btx8a --V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC oua0yblrq, *d w9 ni/l.utlet. What is the resistance of the ladbn y wlqi*l09 /r,au.mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iuh nvg3p 2j8zaww6 c.y45 1* ygoagj7+lmaha1s the peak current through the rj6g j23wha g+cw1pah5o817la yvau* 4.yg nzmesistor?

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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 toi3 rnkupl3ey9, o6j(he+m* gu a 120-V ac power supply. What is the power dissipe+ p3m9okeu6 jun,i(l3yhrg*ated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res8hofsl6:,w / /amyrrsistor 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 50a+3xf .fw*im(m ):exo vz/ t9yj xvpe4-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 m i/ b ,eg4;oh43qddata 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 inducy.ifj j m 9eq.)7ism4ptor 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 a *+en mb4u2 yywzy*b+dt 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanc;l2i.sr e)ul 7sd nn3ye?

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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 induct( 5ubl8zbu- s0qjtb 0five 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 60j +uy. (8l+hqv:tyah z-mH inductor when 120 V AC at a frequency of 20 kHz is ap (+tuhj y:qh zy8lv+.aplied 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, m vzx0l93o-qtf99g xa60.0 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 ka y4tc1 bycvkw1qnz0r). e ln.,(ieq*Hz?

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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 reactj ;-zik hcvhq5ml1., jance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a react 7 ntfsfnda sd/d.b-xk /kd-1/ance 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 thexttug 3(/t /0gt5*aub1umuj k capacitive reactance of a 0.010-mF capacitor be 100 W?txgujb*agk(0t 3u t5 mu ut/1/

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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 0.00 :sh,m nn+da,aqn6lkrt6o-3y10-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 with 12.0 W resistance, 15.0 W8.;yj p yjm v*oyhxx27 inductive reactance, pm ho;x8 y2.y7*v yjxjand 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 regzsj 777 flizu0*gda)u,7wx zsistor, 20-mH coil, and 1.0-mF capaciz gu ds77)gz,fjw7a x7 *iul0ztor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resist65i mu kl+we/kl14dknv5k :ym or, 20-mH coil, and 1.0-mF capacitor are connected in sermll1u m:kikwyv45/nd6 k+5ek ies?

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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 seriesr .ky s vk uc )7.7iymx8mps3e/gnr0n2 with a 20-mH inductor, what is the impedancemicp/8 u.xk0vyrsns. g7 7)rkym2 3e n at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is cqwm -1-rmsm,- evnyd 0onnected in series with a 20-mH inductor, what is the phase angle at 100 0dy-q,1mes- mmnwrv- 0 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) yirz2i3 su(u0pu 9r xt;rnb4 circuit with a 20-mH coil and 1.0-mF capacitor for a zi4b ux39 2ir)ts(pr;ruuyn0 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 capaci)kms/)ce19ny/ykg np tances is needed in series with a 100-W resistor and 15-mH coil to get a tota)n/1y9g / pnk kme)yscl 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 * 8/7ybll,;panztrm5: fxin i series with a 450-mH inductor at 5000 Hz for a total impedan:a8; l7ir, lfbm/ntp 5*x ynzice 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 .9tzcxfz9.pce( r4e cv: )vjkwith a 100-kW resistor at 1.0-MHz for a total impe .fx4tk )evr:9ezc(.cp 9zvcj dance 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;gypidh92ab5 a 20-mF capacitor. What is the impedance at 1000 Hz?;2gihp5ya9b d

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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+tqnq 7 rv8fd jnzd*2+ series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?dz n28++fqrq*n7j t dv

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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 4yxlz86xccjj4., eadr u-h6z in series with a 10-mF capacitor at 1.0 kHz for a phasehxzc,y zca 6 x4e-r8 .uj6j4dl 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 b, lutfmw;4:x8d vkvg 1imk,/1.0 kHz for a total imi/lmu8k gfm k,b ;wv14dvtx:,pedance 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 5ocw r.08q wjdis the phase an jwq.cd58w o0rgle?

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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 coioe uwh5mix g7,65z;rvl, and 1.0-mF capacitor are connected in ew5u oz ; 5vighm7,r6xseries?

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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 co iz(n5p s(p,-rr 8mdgmq/d 8clnsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Thesl/md,-pcirq mg8 d8np5rz(( circuit 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/8k yd ychav80f(tr,g, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 1tkhd/,ygfr8 v0 a(c8 y10-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a/ mfeuc4 gty0ok3+hyhx )* qm9 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, / o uhhky39q+m fgxt*)4ymec0 when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessaryy 4 (ziai.zs9m jfy2w8 in series with a 500-W resistor for a phase angle of a2fyi i4(sz9wmz.y8 j$40^{\circ}$ 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 9o (g(iqdo(pw,8sfnr.p99vs uv 5zjm frequency shouszvpsrop( 9o8nw(v 9g9m u5d(qi,f.j ld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 123v4b4 erzr uwc2b6ly6.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powbvcy3e2u lr6 zb 4wr46er 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 circuit3116wkdypl fd 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 r2lg5 5iihfod;esistance of 30 W. What is the power factoroid hi5;5 l2fg?

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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 contd,..d6hi*g1 ek:si wo j9fe fjaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p9ie.wksjg,do.*:1 6h dejffiower 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 vbh x/ *f6jah2capacitor and a 15-mH coil in series? 6/j*b2vxhafh

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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 freq i+q)dsik z8,p8smo m,uency of 10 i8do,s8m+ s pk)izqm, 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 serieqn7*oim ze5kj/ auwt, 3:zb :qs with a 3.7-mH inductor for a resonant frequency of 1000 5zk,wo:3m7/ qqz : aijnuebt *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 s2r;m 6w xhki;/ 0qltljeries with a 30-W resistor and a 40-mH coil if the resonant frequency/x0t2 h 6i ljqk;w;lmr of the circuit is to be 1000 Hz?

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