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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 followingm:uo09i36o dicrb ;w c are units 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 i 6xg x)louyizq*r/mi() 34ox 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 0x1jb1mq7u /xua.m6r hr pl1zlqe(:fproduces what kind of change on thxrr0u/xh 1j6m1 7l.lzq:1b um q(e apfe 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 os i /zg19dsxlfvbugfm0) +)d3f the magnetic field through a loop of wire produces what kind of cha)u0f)dxzls1v /gg+i9 dsmb f 3nge 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 of change on t.qgazdly 1e71fr p1zd.c0 y f/he inducf/.1q1ly d f eg1zac0zd7rp.y ed $emf$, 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 maf wgk9)4ezk69- p4 .jqt nsqcugnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduts qog.;k*6k0us xxx y+hw2( q.sfe1 kctor will be that which tends to produce w (hs;.y0 oxqkx6sut2gs q1*ewk+k xf.hich 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 hwtg*,dawql u+te.on5l0 ++ hd1tox5 horizontal table. A bar magnet is held above its centeh owed+0.5lx+oadht,q tul*w5+1 t gnr with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on e8ke5 ayb7j dg,d6by,a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling eby ,8d65b,k dy geaj7magnet 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 a8kz6z b2/;kntv l.voi( ny, gmagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, w2gnzz6/.(b lk,i vknt;ao8yvhat is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vecto02*w: wyjd5xtlev3xv q n(c m/r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what vm*(3w0c lx e5:y/jv 2 tdnxqwis the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fie2+7* bv 4mfpvfzm y -v0uk8xapld points0+vbmvv 8 fx*- a2m4k7 pzypuf straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table ugm/ 4kzc7sav8,bno4 3/agpaand carries an ever-increasing cupasacvn4o 7 u8b ggz /k3m,/4arrent northward. Two coils of wire lie flat on the table, one on either 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 throughrt-yrv/wd/) -i6p 4r.upgqv m a loop of wire with the north pole entering first. As the north pole entev .uyvt/i)m/r-4 qp6drwr- pg rs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosx /1f/b)wyhbrabp, 3ge direction can be varied. In a region where a unifb rx)a/, byhbw1 fpg3/orm magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axin, 4a)e0sbgl +8cxbq ms whose direction can be varie,lne gxmq8b4 b0 a+c)sd. 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.4cegmg 1,lw-usr; 8vy
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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 th tw -fmlju)k 3y4m:/rgat 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 magnetic0girdpc2ei5jyn8k*u 9ukngd ov ,6,xu(t1 4 i field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-w cljl6t.f /p.c8qjf0a y 1un-oest direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced a1 no c ju.t0qf-lpj.8lfya /6ccross the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocityek-nskqkodx:je ) 7 /; $\omega$ 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 trans0 ha+ dcn)x+h)dlr0 jtforms

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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 2x;5wj )mg 0y ssz5;wu : ntyu,xvrnf-through 60 revolutions each second. The frequency of the ; mr z-sj)5u;xu gs:f 20nw5xnyywv,t $emf$ 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 devic7 b67vah: fg oj ior)lp0cn7s/e 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 de 9bjk23;7tioply-fc wvice 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 m fbo3q: zuy+) k0t4z /w(dc(a(imvvc wore loops than the primary coil thiz (av4(:o/(mu) vycc0zfq wkdwb+t3 en 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;;5eds3patx 7cx4q:chb) r xa bio6n( primary coil contains more loops than the secondary coil then it is x 6)shb ;qnx7;a iobx4a3tdp5 rcce:( 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 ssb l8m 2a/dppi76/ rc)zqc1pt

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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 circu cav: mx:prh /mbu:.a2it,

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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 serierl e.c t*p/ :usebe; :(uupg)wv)2zggs to an ideal battery of constant terminal voltage. Atug2)s.;bre /lp ::)cge u(uzvg *twep the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a+6cw 6t q e/cfonx3d9cj3i eg+n ideal battery of constant terminal voltage. At the moment contact is made witd36jf n93cow/e +x g6cc+q iteh 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 conne0y1mhro:ylm 4zxh x ,.; by:upcted 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 t7s*mc36c byg;nlq w0with inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 induck8wz2 19 mtc q.k8dgrnm 3ss8ftor are connected in series to a battery. The time constant for 8dssmm88gk 2.fcwzqt n r193 kthe 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 series to a battery. The batmimgkf + )3m+ttery is suddenly removed from the circuit. The time constaktmf3+i)mg m +nt for of the circuit represents the time 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 ex rri 9/s1j,irrm kl7u93iweog w..q)fcept:

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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 k 2*mu5c51 xv72ddqu gzwk0ofuapu4 +supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuizuxs pe.;r;) bt, the currenxr;) ze;bu.s pt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the f1 cgd, kiiv9r-requency i-rgvdkc ,i 91is 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, the7x3 fui8v l2z94wtowr inductive reactance of that inducofi39 2 ul4wwxzv t7r8tor

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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 us 3o36w51bwf; sr mznthe AC voltage across an inductor approaches zero, the inductive reactance of that3fr wzb 6om3ss5nw;u1 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 thisgw 80cfre/k(4r /if eh circuit, the curreik8/40 f efr/h(rgw ecnt

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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 bn q6 j-t7qjgyb-ms 92ly what factor when the frequency is trqj- t- smy 7gnl96q2jbipled?

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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 zer3x e1m p8 )..+mazaa*jqh rvyyo, the capacitive reactance of that m yxv m+.)* jzh3rq.8a1yaapecapacitor

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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 and ca.obh1,v/t hwzg or*k 8pacitor in a RLC series circuittvrg w,ohk /z*8ob1h. ?

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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 cz f*u(2o36nkcvr t 5hrircuit 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 .no4(xc arrh*if R increases. When is this statemcarro.h n(*4x ent 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 circubg ns2p z.s6t3it. The impedance of 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 ;y)+ dma8 p4wk, pplbsincreases 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 b5.2m5 ) tzewrzn 8qf pkpj ph/(1sgrf8oth double in an LRC series circuit, the resonant frequency of eqh 1t8/5.f g8wzpz5pr k pm fns(2jr)that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven byng,;swas:f+,dhfh9 if i 3xs9 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 wi s a0bc7ok tr7cvnzb6y8 /z-3hen

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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 mg8 ix /u6xp-kv 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 magnu8-xixvgp6 / ketic 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 fier h-f;zy y6 (ck*;awjdld of 0.20 T. Finc;6h*;yz( wrf- a jkydd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiuml4 f /)hgpkn9s 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 h)l/m 4f9nkgpthe 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 adj).s* ybnj oj5dustable 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 coi kh3h8v.k4pbr f6ub7kx8+ jb ol 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.hh8h f9 azgg*s/q6i *aq :dt(c A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifohs 9c*8qhztaha id6g: q*(f/g rmly 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 area ye ( mh+ ol+m0g+4ze2b*abdws 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 and ar 82w0z gcpad ct -h 2glcij()zmeup999ea $0.20 \; m^{2}$ 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 spfqcn m h(m*ch)0pghacg+gh1 sj -j h(e44g3 7ean of 60 m flies horizontally at a location where the d(m-ejah0h h4c+ )m3e*fs g(chh7n 14qgpgjg cownward component 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 thp t*pf80w8jtq8l ap3 fgm ;8ibat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its8a0lqpp8f3f* p;g 8b8ttimj w 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 loo61ncs8hg wtql /c:j: qps 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 o wxksm j5)otf-(93icyw0t-* mmmplos ;) nf: qf 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 lobdb.ssl+vp;v ; (pb+f ops on its armature. Each loop is 12 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, wh df(s+bbv s.p;v+b;pl at will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are3 4mz: 9(mxgqc72sdehbe te (ga $0.090 \; m^{2}$ 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 tokvkd,a lm2ffd1 n. qk1o/:an* construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area ofnqa:n1*k .dfkl2v /om1k, f ad 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 maximum d9i:j vs9gp)f $emf$ 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 3 5vxr i,qd2t0sgoe +a6.00 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 az r69v8r:-yxil9wq,1k8yr a,p zrdw r resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generate,kiqw: dz-vwa 8r6prr9xz9y 8r1l, rys 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 r y 6x9qzzgx*n.esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cx9gzqx *6ynz. urrent?

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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 resistancemxdmr4kk b.: 0 6.0 W is connected to a 24-V power supply. The operatmbk0.xr 4 km:ding 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 6.0 W is connected to a 24-l b5;c y*ztgpq;qs -. vxk2 o84fo4zcd:;ukc bV power supply. The operating current is 1.0bz ovcc*-8qxsb5zdfc l4qg;tk;4ky:2 ;up . o A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to redcgw2/mb+xma84 (dn5 edgyk .iuce 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 flow in thh (,upu khe42qe secondary. How many turns are eq24k u,hu(phin 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 necessaryk*akswe +7qh0 in a 110-V primary if the 24-V secondary h7 qhwe+k*0ska as 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-turn primary coil and a 2000-turn secondavj1 ff627(8ufgsnnm mry coil. Imn2g786mu vf( n1jfsff 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 primary of a transformer. Assuming ojv.0bp1 gbgb w1c-5c100% efficiency, how many amps at 24 V can flow o cw0g1v5 1bjcg.pbb-in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The mfm- /)qk*pk xbevo9ehcm: .+primary cokme/c*mq 9f xo :)e-vbmph+k.il 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 prima8 bceeo 0t6z1qry coil and 300 turns on its secondartq 16eoz0 8ceby coil. 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 t 2,+: xzmrswjxurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaryzmx,+w2rs:x j, 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 200 tj mdhi56n-kf* urns. If the input current at the primary is 100 A, we can expect the output current5fh-i6jdk n*m 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 j d1ihng6y,x;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 secondardn,giy6j xh1;y 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 secondarsw e+phtj7;9ad k(k:a y has 200 turns. If the power input 7s a+ehjpkt;(dk: 9 wato the 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 of current at 120 V. The volttcqkr9848 2exccu 6lwage 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 48cqlrw9euk8x tcc2 6the 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 currentm0im. 2(+vr)n1 otcxg2uxopp 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. Finpnr1 ompg(v m.txc2+uo2 )0ix d 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 currentfha fy-cl:h k0;3u0n8 u0ey)tnu0y jx 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 thuya-3y0eutx y:n80l f0nj0c kh)fu;he 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 resis lg iqg5o5)946lc nxcutance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thcoq) cglg lunxi 95645e transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 s;c i mmfg9m.9u4tx2iW. 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 origina xg9 9m.4tm;ic fmusi2l 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 transmitteddyht*0; gryi9 down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 9it0d*yyg ;rh 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. Itaw,1k/alo*slv ,gis6qq* iw)d fd+q 5 is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generatdwfl5v q kqq,l1gsds a*wi*)i/,o+6a or output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a cur)k5 va vh:rz4irent of 5.0 A. How much energy is stored in the coil's magnetic fiel)5vvrzihk 4: ad?

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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 18-H inducttj(j :1h*qg+qssa*fv or. What is this ciafh g+j 1**v ssqtj:q(rcuit'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 where the rms v8gk)fw9eipwf :aizlath-7* 0 oltage 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 i1 0-yn*rfihy ps 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.3u(2 o 9iyglst What is the resistance of the lay 3g2(i9so utlmp?

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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 12ne b xj; z hgr48,)6rto7eyf)nruepi(i . ;gv90-V ac power supply. What is the peak current thr8yb 9g rpgeioef( r .jh6xev);ztur n)4 ;i7n,ough 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 ac power suppw.)qm 7v)82agv4m3 fq 0qm)amlbkpwr ly. What is the power dissipa)r)34qa)mp.v w b mvgq72 qfawkmm8l0ted 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 resistor isg)/bcky-)gavnwk h. ( $I = 0.80 \sin (240 t)$. 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 red ,-tmhmqz9 wr4)b3bh4r v y(wsistor 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 ra;zsd4 fpposm h 41abl*sd20 e- kfu7d(.h* dxesistor 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-mHx4nh9 k;kyoq * inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive rr8k80+ qhodp t/j9 wmdj+o0pyeactance 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 have 14.0 W of inductive reactanc+ qjii a.fe768t57y*ipq egl ne?

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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 inducv2z d/1iocpvj -1ilun* .csz0tive 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:d lgf9wx*m f/)fxaj o7;l )qh inductor when 120 V AC at a frequency of 20 kHz is applied to l/9x;w7 *lf fjxd:) )qafg hmoit?

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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 sm8l+ 4qy (tak2.50-mH coil 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 kHz:1dtmwua0 f v)x3 ;vwg?

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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 gsof7 (x0qlw4mi l 8.sto 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 have a r)vyt*q ;s m 4(ob nxhu-j3n4rleactance 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 capacimiy gm0mi c5/,kr-(v wtive reactance of a 0.010-mF capacitor be 100 W w kyc-i,v/mm5g0r m(i?

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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 czz(f et57 r.ka 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 circuitqbh+6uo,l ;sm with 12.0 W resistance, 15.0 W inductive reactance,su;6lbq mh +o, 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 1.0.ar)l, zvdrx +8ujdqh(pr 0v1-mF capaci qdza(, x.p r)rhj+0vluv8r d1tor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFel q(b;,t+*a:kmg.k :yn nvha capacitor aran+ak,b:;h nly vq mk:*e (.tge connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whazy3.ynv5d p,. zki. jut is the impeda,.vzn5d .uy jypk3z.ince at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-m,- ejdl.jwuz3qr ie21 /n wm8rsrh6/ zijp2(zH inductor, what is the pws zjm,j qz 6e3z(-1idr8i j r 2wlre/phnu/.2hase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a1imjqk z of -btmpa8)*3 8tk9e6idh3d series circuit with a 20-mH coil and 1.0-mF capacitor for a totomzkd3*8dqfit eba 9 8 i1 6k)3-jptmhal 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 in4a j3;o ba0w9+ n)ir wikltpzpkr/)- p series with a 100-W resistor and 15-mH coil to get a total impedance of 110otbkjwnp3 z rp )pi;-k+lwar9/0 a)4i 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 919 b*qfxr+umxco1x/u:7 tcwrt ly :eries with a 450-mH inductor at 5000 Hz for a total impeda7xetft r9+/:uc9 1yucr 1wm b :q*xoxlnce 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-MHz7 ht h+ qslz;4+uadsr) for a total a+ hs)l4z+h q s7rtdu;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 56psp6 -t 4t 7hkqrx cn7r)kdcseries with a 20-mF capacitor. What is the impedancxtc-thrd65rpps)74ck kn 6q7e 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-m:kf d -xbr,za.dz 08xcF capacitor at 1.0 kHz for a total ixr:fc- k.8 0ddzz ,xabmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee t;u0*kdj yp:gngc1a89 tbt9 xded in series with a 10-mF capacitor at 1.0 kHz for a phase angle of g 0buygtd x*99n;ja8k ct:1tp$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a n1yqg0cr.mb v v6nfl mc9/(e1total imnfv/l vm6myc(g0b91ec. q1 rnpedance 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 (5 058fz6lph,yexy ecq /ag xfwith a 100-mF capacitor at 120 Hz. What is the phase anf 8x0,cp/za6gqfy5 lxehy e5(gle?

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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-mHuznu,kazhfkg* )nl83+nu*4 i js6od 5 coil, and 1.0-mF capacitor are connectel*g*k,z8u5h3 n + z6fj u4 uioaskdnn)d 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 c, 6sc/k:pownc apacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms6/ cp,wk s:nco 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 reactanc6ci bw5wq:tf+ll4k.u um5 gq lb 1rob16:c u,ge 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powerukgc lmut6 55l q1bl.c,q6wub+b1wg 4i of::r 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 RLnoi gz-82(qf 5/ lbcpkC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu-kf8io lb25zgq n/c (pctor, 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 necessary in series with25oo sg.c2ez f7+ bjkr a 500-W resistor for a phase angle ok 22ejcz5obf .+sg or7f $40^{\circ}$ 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 = 20k9 m ip9gsw: z1;;pv-j)p kpbx.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred w1z-;p ;pg:sx9 pk)mik9 pbj vfrom 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 +wx1 vmg7vi2qin an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacgwv2q7im 1 xv+itive 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 c29sm9rt061b6vd mdxq fkb t5d ircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Whr1i+s- t r,y.gcefw9 dat is the power facto ,ge.s1dyrtw +crfi- 9r?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resis/0ix6zfedj go, *jk8otor, a 10-mF capacitor, and a 0.45-H inductor, when conn0gjoo , 8i/xd*6zfe jkected 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 caplm iey/0(rry y5c (z yz:2q1sc7l5qq( l uotw/acitor and a 15-mH coil in series?qr o(zu7//5tqy(rylc2w q y5si:1y (lm0 ezlc

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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 resonm b-icp9ei*hhlp+7*nv 3az 6aant frequency o- m93p7 p ib +*cavi*al6nhhezf 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 , kv:iw l( bt)4rjqv6swith a 3.7-mH inductor for a resonant frequency of bl4)qr:j tsvw, v6ik( 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resis,v;oii9fg8 m/ wl2d uftor and a 40-mH coil if the resonant fre 8ffd2l;w,9 /i umoivgquency of the circuit is to be 1000 Hz?

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