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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excep:gat2s jnxdvmi9 t) 2u:.v u2zt

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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 lv4 1vc4hnr(;n;dxm xthat 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 ki: p ymxo;1jos8j xjtp+*b+w( rnd of change on the mx(j;+j1 w: jy8toop+x*p b srinduced $emf$, 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 loop7 yhs6d)nn ,yf of wire produces what kind of change on the inhy7dfy, )n6 snduced $emf$, 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 wirej 8eiifx3- r,c produces what kind of change on the induced 3i- efj8 ci,rx$emf$, 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 mao na2b5.id8mognetic 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 currend (+ wg9z2,1kuk;uvk a*q6e6psnoy njt in a conductor will be that which tends to prodak+g(2 yd*6o6qjn, se1nw;9kup k zuvuce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A cles.u(d0 ev( bar magnet is held above its center wi.sve(e( l u0cdth 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 a horizontal table. A s /+ygl /rx5c9qldcl.bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from aboveg d./ql y/9clclsxr 5+)

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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 regz . iim7gx5z2sion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induceis z.25g izmx7d 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 inveyanz. 02 8wm a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in.eamnzwy8 v02 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 t2szjo,e4 cgy0pp lqxn.g,j -+able top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the lp 4 j+-j,ggqec2oy.x zsn,0 pinduced 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 a)xbqqvy-.l,r t1+rwe nd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curre .qtq1y)+bvx-rw l,ernt circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the 8) z;n 3lzztg9ztj z(phbvj,i65isb9north pole entering first. As the north pole enters the wire, the induc,tgji( ; zzzs)ij6 lthzzv5 38n9b 9bped 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 ro7,+mhogp g) u 1ban*j5fxe2rqtated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop*o +f j u7g2r mxn5ge1,bhaq)p'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 angulbs qo;:(wh,m9dp 7moj ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight d7smdomo9qh b,p; w :(jown, 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.p.(;l mt8nstpptc2e:n c8g u :
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that au2h1a)eoev uukfqk 6y -7w e48n $emf$ 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 magf4j ty:/v *k,gf5 p.e;agv hoqnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mov6vilolf i wr)lt6f0.*ed northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducelowf. l irf6i60*tl)vd across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity ye)3f wu4;/h)se g xnv$\omega$ 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 transfohxup 92t9fsxx x 3gs77rms

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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 l7yaq. 1iqj1iv- h (yhthrough 60 revolutions each second. The frequency of th1lh(1-a . i jqvyhq7iye $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device ux n,0xt q deok:x(r)y8k/o0zxsed 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 dev ixh/l)589 jv5c tcakgice 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 pri fgmo 3l8m+ fh77c:cunmary coil thmhcco7l 3 n:gu+fm8f7 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 primary coil contains m yl)-;j,b3 zkwks od j2cp+wq p4t7f9vore loops than the secondary coil then it iszqdfk7sp p,l2kj y9vbwo;3-)c+ tjw4 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, th+x c;mfp1 t+(ntuh6jq q7 ulutw.lhr.ev.3,ee power 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 rdw2r;n y 9:rtkw:xt4circuit,

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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 conngx8 :vhrdiqs9*,it9vected in series to an ideal battery of constant t d ig9v*t9r:ivs,q8x herminal voltage. At 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 ar 5t(f0 wuef9u rd+3 e0rbp;ug8mvi 1hde connected in series to an ideal battery of constant terminal voltageufdbi d +v(9 pfu;5mw00eeurg8t31hr . At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R ipm .vg1j-9srf hbrd-g) * yn9*dokeo0 s 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 resistanciut3 2hnluh sx8 29xh+.7xlhce 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 inductor are connected in series to a battery.b-kn2jyr)b; onc: y2dsh4 8 yj The time constant for the circuit represents the time re:4k8y)nbs-yjdc;jh2ybno 2r quired 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. T c;/ y/c+sas *1pcdhgdhe battery is suddenly removed from the circuit. The time constant for of the circuit rep/a;c/+cdps*1c d hsygresents 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 s32ta e)ayu,c wz +wq evfj)8v sqs;9a-ame units 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 this cir4wd am pl+:y2tcuit, 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 th2,8u,g6j)exy, wlfmolgx i q 4is circuit, the currentlyi,)x4 xmgfjw , oq 82ugle,6

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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 fack* 4*dcfcka 9fmh 3i7wtor when the frequen 9i37 kcdhc*k4fwm* afcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indy,d b w x/ ho3q03t09 yh0rkwcqg*) q0p6tdbwouctive reacdyc0dr 3xohb9 h q00wywg qk w6/3*,t0b)oqtp tance 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 bk2* mblpn:u0 inductor approaches zero, the induct pubb0n :*ml2kive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cw6 tar w9 x,7e8xtlx0mircuit, the currentxwl6e9,x0wt 7a m8r xt

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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 2we *ljd9h)wfe(nd3 p ac circuit changes by what factor when the frequency is )ej93 pwedl*2f dh(wntripled?

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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 voly,2-lnhyca./ ;gw gq9/nntkhtage across a capacitor approaches zero, the capacitive reactance of -tl9h;hqnnw 2ac/ynygg/ .,kthat 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 voltages of the inductor and capaci;ldudxnwbwiew n36f; t07;2g tor in a RLC series circuit?wgn ; n26udb;;eftw 3l7 i0dwx

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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 ciry wki*atbzv)4h ( 1:d1ii3jxop6/utd cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incrzp, a+ouaay rktm++,2eases. W akpuyoa +,azrm+2+t,hen 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 impedt1:9qj7s-r /qqxlqz16w j nl bance 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 increases if y7wvk tmo.6*igt wdo( 47quh2$X_C$ 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 yjj20bfqwl sl:.ks - .series circuit, the resonant klls2:bjyw f.s-.j0 q frequency of 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 thatqbrygm66fx/bnmr -: + is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit btxfrolj n,(b4+ yb+; 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 rotating in a uniform magnetspyvrl53+7bzh lm-q ; ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paryb5v+ m p3s;zhqrll-7allel.

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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 rad ncze4s*r6r o;ius 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 lroe4zc6r n*s; oop 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 unifo:7z lsta+1w bmrm 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 angle of ta7bz+l m1sw: $30^{\circ}$.

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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 singdb xf3qd 0f4op,7j*6 ncdg ev)le 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 coizthhc 7 ju1.i1l 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 wi)2ublek2 c2 6(hqji wqre on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thqu eb(ij)kw62h2 2cqle 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 anooegk +n 6ym92 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 ap 4g 40*ewgbl:c gak)1) 9k.znoshwxyw.s3gp nd 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 horizontallkpop:w dv j)fqku* m9zvr)4;z( :,9gxnco h;sy at a location where the downward component of the Earth's magneti9jr h )qup ,s(fzm;kg*xov 9)vco p;k:w4:d nzc 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 mt)ka;;mvyg3 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endv;m;3)tykm ga s 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 generat.3e4a;8a 0nouc+cyh otxb0hror has 50 loops 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 of3 rnlw) ua-5py 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 loqsc 5//qnp 1fj,d0fx 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 iscnqjf 0 1/ofq, xspd/5 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 of2 7fmc1vjymv(1ami f , 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 const+ fbo1kz*.(kp3w3 cwc -e wtfmruct 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. I -.fk3t(c wkow wfem3b cp+1*zf 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 maximum 4w7b-g5 q d8as(t ;uvrv9q agvlbj7 /v$emf$ 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 operg7yyj d.w09pv7j toxe3e; 0m iates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operato : +0.nwb8 mpqr)otn e:gzw5nes on 120 V AC, and when runnin:w:n)5opng +wot 08n.mz ebrqg 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 56vxywzv)8c g to a 24-V power supply. The operating current is 1.0 A. What is the start-up currentwz)6y5v8gc x v?

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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 resistb 9 c3kubzk2*tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A9*2 bkuzb3tck 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 connectj:qj+u, pc2qh:vs)9jnf ss y-ed to a 24-V power supply. The operas2cjyhjuvp )sq -,:+9:fsj qnting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primarhru(agd 4 a05;ne:b9 ci(s igky 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 q8njaze2 ;/j yj 7yhq)of a transformer causes 14 A to flow in the secondaryze;)yy8nj 7a hjqj/q2 . How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primarz ze( j)tek-1dy if the 24-V secondary has 100 j)1-tde ( ezzkturns?

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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-tumt q57uh/nl2b. 8qbklrn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cur.mu l 7qb/qtn 2l8b5khrent 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 tran0: q,c/iy.c( f .nu.*szzxpcwd1sx i2zr pte5sformer. Assuming 100% efficiency, how many dexf,ws .20zzq1.yp c*5 t r/snc(xcz. :piiuamps 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 sig.im4 uuwg1 glu8v w+6pn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw? 4.18l pgvuu gm6+iwuw

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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 turnbl .,( 9s7j qu.jrrllzo20fe rs on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is app uqfl7zobs20l9 lj.j(,.rrer lied 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 on its 2uj n+lrgdg, wi8f 8s6primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presu6l 8ngijwd f,g+r28sent 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 transformeros)z*,6yblbh ek;)x0zx db y( 7lw*ti has 100 turns and its secondary has 200 turns. If the input current at ths,e l )7i 0(dyzw)b*z;xktb6lxy boh*e primary is 100 A, we 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 tr1+y,pyoyhu 5 .o5py turns and its secondary has 200 turns. If the input voltp5uh,+yyyt.5 1p oor yage to the primary is 100 V, we can expect 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 transformer has 100 turnm7 *8 rw:ufm4upj45sfa km z1m d;xyde1(q;yes and its secondary has 200 turns. If the power input to the primary ;r1zff15uqk;eexdj my4u m4( p mw :7am*ys8dis 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 voltage is usuall d5,x u )btvace(m5jd2y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1mdab ,xd) (5vecu2 5tj.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 12soeyw)h9 kh/yg px00 .0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission h swy pxo e/90k0yg.)hline.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stzivl0-5utobdagx1 i-+ cl : vnc0)bv-epped up to 4500 V by a transformer and transmitted through a power-dnvgl-- i a:0iu 50z1x+l bvv) tbocc 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 lon. n3z4vwf )il)jn8oohqx v7 p.g 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, th3wjv. f o7q4vn8z p)lnhxi o).e 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 mx)c:3m 9ubdmxz2qz9a 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 u 3umx9bmm)2czx:9zqd p 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 dow n.kc s(.; ykg(c 3zaryc5gq7sr4kg9l n a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instegcr3k(ayg4r zc.qk c g 7ln.ks9(s; y5ad 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 transmitta)a8+ y4vmoho y/k5qv4 sy 3smed on a line with resistance of 0.60 W. To what voltage must the generatorsh vy44 ya5/)+m o8oqak s3vym 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 current of 5.0 A. How much energy is stored in the coilaei +nsx .lc 2e.ie/9ebq;o7r's magn2cbe 9+; ri/.sl.ei7xeqna eoetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductoru)l67(xlgxmx . What is this circuit's t umx )x67xlgl(ime 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 0:wd8 wj efx0irms 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 oo6n cdmi: 24dyutlet. 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. Whay.,zkqz 6;2il ddia x.t is the resistance of the lamp?.;kqy ddizz2i.,xa 6 l

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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 pk0x a-u4xk g-/hn1puaower supply. What is the peak current through the agpx 0h/ux nua4k-1k-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 sut4ncvrlpos .: zy.//lpply. What is the power dissipated in the resycsr/4:ozl p/n .tv. listor?

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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 iq-o / :r.knqom+o 1j,zol6qdps $I = 0.80 \sin (240 t)$. 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 8)xtiph*y rz5ol4quo)nob:b ; s kt0/ 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 a 50-W restvn3+g zxxm-u/g3kq io)z e81 istor 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 .1c(uzsm5wy1te 5ti ue)otr9qq1yy9 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 reactance of a 2.50-mH coil(n cqs po9k+/s 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 .k*yd ibeit2 e4:.chtt l5zs,14.0-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 remue6.zu/75hp.+6fl hgxc wm uactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency odjgbk3 +3lkb oc1 (5uuf 20 kHz is appoj3 5kcgk1+3lu(du b blied 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 2.58n /.9a fc toof 4srm*8e.tgkb0-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 (/)y-3th b snk )dkvg wme1d;qcapacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?uuu/ quudz,y d 1u1-8k9/vvwb

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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 cap7wotxoo5*xw e+s*z 5wacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF d8v ruq,-/b+vcedw4pc9a x+ncapacitor be 100 W?9nuv8,xcdrc/+p evwb + q 4d-a

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at nd)pl0+jce+zbe5 ,z-te-zs7 nbt p/n 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 -hwv+5s ei7 opg69(+ccnk (i7a iwgbysvo3y; series circuit with 12.0 W resistance, 15.0 W inductive rgc7bsi;n cp5yiig3vew a-+(9oh+ ov (76 wks yeactance, 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 H q+*46mtdzcly7es1 n gz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i*msd 7 e1gy+6qnlt c4zn 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, 247lljmc7 x,c b0-mH coil, and 1.0-mF capacitor are connectecm,c l7bj4lx7d in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tll8g.( m4xztmj mk*6 98mtxkdu)j9myhe impedance m. k96 m4m(ml9uj*m) ydxxtltj8gzk8 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 (i, t258 8qzmrjefreiseries with a 20-mH inductor, what is the phas2zrit8e5mrf ji,e(q8 e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series cinyn 47o9 +ygiz6gxc2 ercuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 oi94gy7 gy2nz6cxe n+ 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 needed1jhfl7n bi i 8fc-x2,d in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?1 lxfi,d ci hb2f-n7j8

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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 is*6s5 zatf/s2ib.n0ujgbx) dn series with a 450-mH inductor at 5000 Hz for a totagsx5*b.0uditz62sasj f b )n/l impedance 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 r7a0u* u*hxtjaesistor at 1.0-MHz for a total imtj u*a*xu0a7 hpedance 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 is .xewx5.ek7w ydywoh 33c0:yj the impedanckhj 7 3yecoy3w5x :.wy0xdw.ee 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 needed7w; ; j q;33b/wmpjxztntd e/e in series with a 10-mF capacitor at 1.0 kHz for a total impedjwnb 3;dtx/ ;;/q73ez jmep wtance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHsw ek, oouq0yx;w:s88z for a phase angle okw0s8o:8 wyx u,os; eqf $40^{\circ}$?

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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 q/4s:jx svft j06xz3 h1.0 kHz for a total impedance of 43zt6js xxfq0h4jvs/:5 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. Whavs p pm5/*n8/fejm2abt is the phase an * mpfv ab82pm5jes//ngle?

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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 a6 j; o67i;ck xk7gj) p;na:oq/vdszjmnd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c; jgpck:n 6/; d7aj6zxs;vk 7imjoqo)apacitor 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 z5 yt4-t :ecfx69ai00dzb hlt resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz4f-x69d5y0ia0 t:z tlczt be h power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor;rxmal:sji 2.h +c 4vk of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cirj . imcsl+x4vak: h2r;cuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containin )a 6/e3y(phmptfhq6r(ro)si3 1nyp xw r5p 0hg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect ty)f()pywh0(p3peq6shr/an orrh6 m5x1 pi3ed 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 wi,qh2 w75w fmira tn/r,th a 500-W resistor for a phase angle of w,2t iqh5r7frn aw/m, $40^{\circ}$ 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. Atk1hb9b3 w *opbec,,xu what frequency should the circuit be driven in order k3 uoc1bbp, w9ehx*,bto 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 ouh6u*9rk qq 6p6pgnf b*tput in an ac series circuit with 12.0 W resistance, 15.0 W inductiq6fp* khgnb*6q9 rpu6ve 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 circuit isl;djo 6jjtp;r7 nxz7sv/a8; 1)x/ n cjsgzuy0 $63^{\circ}$. 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. wl)c4 ,8/7fiscb-ii ythffu f +es5w3rkm16t What is the power factor?ekfh /u7w listi43f-bf,1fytwc6s c)imr5+8

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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 factogkj/cxhyvn-. / ono) *r for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sn- o)yvhgk*./ oc/xnj upply?

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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 ca.lw xl+cx56l4cbfk : dpacitor and a 15-mH coil in series? xd5fbk6c 4:xll+.lwc

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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 seriesa:( )gunaqe)*5dmmkq+ kl0g:k.;uyiwhx; ni with a 4.7-mF capacitor for a resonant frequency of 10 kHzdqky))m :gn*i.:5 klk;a;u amqe( nguiw+ xh0?

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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 with ax6lq9aa4 k kc1 3.7-mH inductor for a resonant frequency of 116kk9ca l a4qx000 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 ia +(r..u 8ynwq ;jf0 7ljniadon series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circ 07no+ jjrqw8infy.d; aa.ul(uit is to be 1000 Hz?

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