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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 o4xu9 1l kudo/kf 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 thato2)z5g:qav r e xt )jt x/cnbnyh(82-m the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chde/qf2ucte gn3 7, ga6ange on the indgnqgaucdte 3 f72e6/,uced $emf$, 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 of wire produces what9j6o7x-eoc .iiwb r:) ff8zsr8hh8n y kinhzf8hb w6c9rei x :j.8y7n r)oi8f-osd of change 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 prodnpl ,n 9xw/2onuces what kind of change on the induced 9nn/n,w2pxlo$emf$, 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 zws3991n j lnz*xgg:k from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directi 26)/ zb8vjailbtn+wr on of an induced current in a conductor will be that which ib8/+)az2 wn6rj bvtl tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar 7r.qahei.(lnj.ft + ucnv4q 5 magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fr.q .u( qt+74 n. evijhcflan5rom 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 yk3,, qs45oiol j uzm+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 magnet induces (when viewed from abzol,5 su+,o jy3 4mqikove)

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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 magn,17(n +kl7h v6prr6vymz-vhph pxkhao 2q )-petic field vector points straight up. The magnetic field vanishes suddenly. When viewed from ab p qp)6h(zpy nl-m2vx-rkrv6v+,k1a7h 7oph hove, 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 tw ygny6 eo 8sr7j)fh(uj w261aable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. 6jg n)j72 6yr(1sya fh uwoew8When 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 horizontal table top in a regg8ps y5yjg 6,asda/o 5 wv1kc7ion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is 1jyga5vo86gdsks 7 cw yp5,a/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 horizontal9y ;tx 2lw2p4zml)dda table and 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 aboved;da2l) 294 ltmzx wyp, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 2 3,u*aq52kg+ nplgna2f qnxcAs the north pole enters the wire, the inducef,nn q22 qgkgpnx uc5+ 23*laad 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 rots-u v iijm9c +h(tg7o4ated at constant angular speed about an axis whose direction can be vh c9iv7-ut o+4ig(sjmaried. 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 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 rotinjphmt ic bkw,69)3 4ated 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's axis of rb3 icptjh4mw,k69 )niotation 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.o0899 poykya4 hb*4i cemt0uc
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an aus5cdo.g.wrak;fs 7m8 gun,xz/q. 4 $emf$ 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 magneticuqzfnkz,v5 j :9 ) -)jmwvty0) *hwnpw 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 wt+dh/n:d)ar- ka7lh li1k+deast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement t:dw7-l ri 1)nka +da/kld+hhconcerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angr-vp8wfwit6es9g:r mb( ,q.j ular 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 tdhu 26nh,3digx0rq) iunaq(wr8 ; s9 jransforms

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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 througcgm;ilv*; 4q v;zj1ma h 60 revolutions each second. The frequency of thez;vvi; lmga1 * mqc4j; $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used th / -p)j.cpvwyo

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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 device thatrm3:ieeu3nfu +4 xd5gbx, b4n

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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-i46a 3+2fzleult4moz i0v np the secondary coil contains more loops than the primary coil t i0m23i4uzvzoae fnlp+-6 4t lhen 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 more l1 ;w uzz-t/ojuoops than the secondary coil-1z;u wtzou/j then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powy 0ko(fldlxh9ho 6:q5er 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 circu3 qw6unp1 zuf 17tw6xyit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batt2.tsc /;tmbod ery of constant terminal voltage. At th.st d m/bo;tc2e 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 seribxk,d n)9q*sy es to an ideal battery of constant t)9x ,bndk *ysqerminal voltage. 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 is connected to9dp w tjboq ((9/5yuinmxk-*i 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 ind7y+cw kbfl2v, v(z66 yx k+hgl4ejlt1uctance 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 inductor are connected ingmi9 g(akr:)ubtn n co( x0/,n series to a battery. The time constant for the circuit represents the tx(ung,9(/:m c)rbt ogn0 akin ime 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 inducrz6eolxbk-7)6q)bd l tor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease zxdk)66b) ll7ber-q oto

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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 uni625 0pekrrmlgts 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 circuit, the cdsl. +)(q 3bnpj;d zkuurrent

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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 connefegx0byau/ebqk :6h6z g+tc(v ;km+9 cted to an AC power supply. In this circuit, the currentu /gee:a;6( qkzm fh9+ 0gtx yvkbb+c6

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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 whx*bk62g72 6kgsf rfahat factor when the frequency is trggr 6 xaf b*2267hkkfsipled?

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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 Ad(- uulku) xl.C voltage across an inductor is doubled, the inductive reactance of th- k )xdulu(ul.at inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the i.ngk8 q-s *hrubn+lvy26,xyv nductive reactanc-ybg,+n.lv 6ru*nx8h s2y vkqe 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. I9 )zu3ro (x3zisdlxp 9n this circuit, the currenu9p xr()i39sd3 zoxl zt

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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 circ6zv /tnr rb8 l*jbw,fqu*i-i(uit changes by what factor when the frequenciiv(6ur , w*/8*b qz-fbtljnry is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacit woa(-t /ci6 ju3k5 ir pzwsq5iwj/-h:or approaches zero, the capacitive reactance o6qwji: k5r/-iu 3w5wai cz /so-tph(j f 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 voltages of the inductor and capacit(:r*e x q1fovfor in a RLC series circuit?1fx: o*e qv(fr

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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 circudf(e) mj2q nmjw-qw v7j3ub);it 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 impedanc/1cxd;u *ime0z g8jk ce of the circuit increases if R increases. When is this statemen1/kgd jmxzci;uc0 *e8t 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 circu-rda u8w eqw*9it. 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 seriri wt t3- 4hp4x9p3fd nlrv/uvjtp/39es circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both dziqqyvf1axf1 *r 2 0hqn,kr-l( )t +ovouble in an LRC series circuit, the resonanx0 2qftkn(-ifra 1,)lroq+ z*y v1qvht 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 that is driven by anqpd70gm 6oi y1 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 6jm u1pn, *j scdfy/y;circuit 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 magnetic feu1yi5o,q k/i2y vw8 bield of 0.20 T. Find the magnetic flux t/ yiq2kiv,8uy1w oe5 bhrough 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 radmj17(zmq:5g , aes jyoius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnej ,q5(e7a1 zsym: jomgtic 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 radius 0.10 m is rot3maafq6 / rm3sr80vk yating in a uniform magnetic field of 0.20 T. Find the magnetic/8s3akr0qr 3ma6vmy f flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjusg -ra( +s2eq ml(w.9onrzk d9btable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chag npi6bh.0nro:5; opanges 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 witi:,lwasm o6tlx q9h *8h sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If x:9 l*hqmow8ia t,6sl the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of8zf4e,*kr ;k :eigbj n $0.40 \; m^{2}$ 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 m.ahznao 3,6p9ne c0n 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 flcfcs,tpr:w,9itr 0b: 1;fl o kies horizontally at a location where the downward component of the Earth's 9o: ,it0 k,r scbcp trff:l;1wmagnetic 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 velo8owy2hmh ,8r icity of 2.0 rad/s about a vertical axis through one of its ends while inhwy8 ir,2h8mo a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of b-4he ;oqy/ pc 7k(ucl$0.25 \; m^{2}$. 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 10/ j7txcih zxtp+ ;m9) r.omxn50 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 1d hs* qcrkv/7kt,uz4 l2b.b0x2 cm long and 8 cm wide. Th*,t7dzx l/.bsh0vuk q krc2b 4e armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage 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 f v:,uk ac of83qx2 8dydv..xw100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC gen 9q i2ffk*mfknm9+4rkerator with an output of 12 V maximum when rotated at iff9rkkkfq4nm+ 9m2 * 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generato2/eiwm/r8+ mxfiyzjt6)xd k9r with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto,3 2x:as.3cdri vtfpvui oj..g te/n 8r operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6t hve* v4w+c/j9pce5ib7 k 9vk.00 W. The motor operates on 120 V AC9v evkp4 b7twcc/eki9v5+jh*, and when 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 h6o+rnw)v sio 83we3iconnected to a 24-V power supply. The operating current is 1.0 A. What is the sts irv+i6n3o8)3h wo ewart-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 6.0x hss2s,y 46yd W is connected to a 24-V power supply. The operating current is 1.0 A at s46,2 yxd syshfull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pot5 ;jetc+dr kx k-zg-ep:/4w)b3xeyhwer supply. The operating /4eyxpk) g tr-+ e5jd -: eb;hktc3xzwcurrent 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 transform sed2ibw6b4.0rwdcn ze )i yn,)yss;6 er is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tr ofpt ow ;2lb6p)utq1t+y2u5jansformer causes 14 A to flow in the secondary. How many6)bo f22+ltt o1 jy ppu5w;tqu 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 necessaryy;wkc2 yv.5xw in a 110-V primary if the 24-V secondar;y 25kywcwvx .y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-tualmfgr - g;a1s-(y)w +6szkbd rn primary coil and a 2000-turn secondary coil. (mflbag --rs d+ayg ;6)1kszwIf 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. Assumingoil6 u locvi nyjv- +c-fre*rg; 39g1; 100% efficiency, how many amps at 24 V can flow in the secy cv- * g vre-l;3nlr9g6ic+1jo;ufioondary?

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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 t g kh5e ab7xu6y 1:gb5py:;gbzransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What ;u6gzeyh gba yb:pg1b5x:k75does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300:88; oc3 xdm+o gizbep turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sz gp+ixome d; 8c3:b8oecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformert- q8m/a4e* p o+w klb/mrnhj0zel;u7 has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secoa;0w m/8 4/-+ plekq rm7n*teboljuzhndary?

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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 transforme(/w3 w, obxxe87bwhn zgu0m; pr has 100 turns and its secondary has 200 turns. If the im /xwb8,3(w7g0xn;z ehupbow nput current at the 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 transf2l2toq0k-7m sm8 de6rkn/x/li ay3zw ormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expe/dm 3 x8/6o -alwnkz2rit2q m7lsk0 yect 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 turns and its secondary has 200 turcs): n 0;qzl hq5*xovans. If the power input to the primary is 100 W, we can expect the power output of the secon cxhvnz5 q;qso a:l0*)dary 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 asmnmfg2 y kxi7e 1u5p:2)4dz of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throum14adngiuk:)e y7z 2 s5pmxf 2gh a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step e (p6vp+oy6o6af7ausped up to 4500 V bs6ua6a+f ovp e6o(py 7y a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste*ugds 2er8gk :pped 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 l*gks :2e gdu8rine if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.gdjkmv,x,z( x.4b1bq60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissiodbm4(gx.v,z jx1,bkq n 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 resi)7+tkg hd0ol* *l hhfpstance 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 steppohg* d)hhl k +ft7l*0ped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How r- bo 1:5i4uto6rurt e-sl*g;tbkp l/much less power would be lost if the power were transmitted bsiou6t:lt gl-t 1errk ;5*- p4/ruobat 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted os0v: udas 5d3d :7gczan a line with resistance of 0.60 du0cazd3 d7:a: 5sgvsW. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original 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 sk viu9 1xh) ,,(5 v+mgkqv dhvxdm.ai(tored in the coil's magnetic fmixxai.hv(g k h +dq1)uvm5v(d,,9 kvield?

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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 .-rs it7o)vsf-W resistor and an 18-H inductor. What is this circuit's time cos7 s.v)rt f-ionstant?

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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 voltage is 1 rjp3 waxr72(b20 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currentgtot5dqn:,wtoir d,5p. oj5;?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance ofv4k,c hytc3jw*nt4h 9 the lamp?v,jt4h wy3tnkc49* h c

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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 122jv)7ca4ny; lpy ad nx:12hxl0-V ac power supply. What is the peak current through the raj2 nlxl2d;xc hp 1v74yy)n:aesistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whathwn. 6ine ;oo0w3h) no is the power dissipae)hn.0ih;n wn6o 3oo wted 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-p,krjyap4o wr+(d ,a.W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis qg1- c;;s+p ,hobrzkftor 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 resistor is b;fna;ti h9uczo+85 i$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor o)1 *r l)uwfnxat 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 39dp2 9b4 ksdpp1fwns 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 indu1i3ea x7)7d bxc,dj 3nxgm1qactive 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 kxxs;5 2(lap/nzt1w0rdgh .y 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencww8fb3 vw/7, yb2liv rl/)ms ht 99ea-d ,hsuuy of 20 kHz isv/9rhuuymbl/sbwia, - 8lh9,ws3ef d7 w)t2v applied 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-m.xu-r cmz dxju6, nix se5).e5 min,r.H 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 4bt 0 2kth8 y3mosk j*xwrv8x4).7-mF capacitor 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 r1xyr8wo cjztl;+bb *h) a-5i7yafwi9eactance 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 24hrkk;kwj 1u) ar)x xsf),lxa 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 capacitor be-x tfwyp,h 108:yx 2mm2f nzxx 100 W?1 h2:yxp,myxfwmx -x8 02tfnz

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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 capaci ys8;8xbtu v,uufn9m+tor 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 resistafl6/f 6ty0yy otx5 0 oxhmy2k9muu.x5nce, 15.0 W inductive reactance, and 10.0 Wthyk omy5 x6yoflmx25uf0 t0.yxu/96 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 e*xsevxdf:32 resistor, 20-mH coil, and 1.0-mF capacitor are*x sx:fv2ede 3 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 is-. j2/okgv enf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arjs- o2gnk. ve/e 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 se*+umt.ka 1c( *n-+zdgqx. nj4 yvyvoaries with a 20-mH inductor, what is the impemaz+ jynvyvg**xd+k a.t o-(cqu.4n1dance 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-mH inductfj82p, -qtgul **w gueor, what is the phase angle at 1000 Hz?fwqt*j *e-2,p gg uu8l

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF czd:n/l z*1wj6 q(odx: at/djjapacitor for a total impedance of 100 W at 1500 Hq 6tl:*/zwjdx/jo d1a:d jnz(z?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is nzsfup.y1ni4 71h k:df eeded in series with a 100-W resistor and 1p:1dnk7h fzs.4u1 yfi5-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indu. ;+ mcus.5mz8tps sevctor at 5000 Hz for a total impedance of 40000 e.p s. u8ctzs+ ms5m;vW?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a :8 x9zo8ov1n wg vtk5qtotalq8195vn:otzxwg8 k vo 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 coz3qmp2 t1 att zvrqd+onh6d5sr4 61w2nnected in series with a 20-mF capacitor. What is the impedance at 10006von2tz6d3ht4d2pr5 sw aq mrzt 1+1q Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor.1 g drkilv-v15tnt a8)z;ebt at 1.0 kHz for a total impedance ofztd.t r18ka)enb l tg5v-v1 i; 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 am9 /fy1sjqd6 with a 10-mF capacitor at 1.0 kHz for a phasej 619dmqay/fs 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 1.0 kHz for aojyz -*mi7l u 0svgl-rv0 a7m2 total impedance of mvo0l*0zv-aj- lu7y2im r 7sg45 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 serhy 1c,i.r l+jb5k7bzftq3 ai2 2w(hho8jd c9jies with a 100-mF capacitor at 120 Hz. What is the phasez 7c+cly32jabid ,tf h.2o(jqw k9i8 jrh15hb angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 15006,mm ) uqdh1fz Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?u qzd 6m)mh1,f

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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 capaci t dciub4)-w0xtor, and a 0.350-H inductor. The circu0 cbuw4- itx)dit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacito5w l*eg ngdh-*r of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seln5egh *w-* dgries to a 110-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 ba2z8pk 7dxw w56o2eha series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne28 627pwazdw hoxke5 bcted 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 with a 500-W resistor foz6n9yh gg)phy;cf;z d*8:1 i(lc khc cr a phase angle of hcgil98 : gp;ck*;61nhz c dhyfc()yz$40^{\circ}$ 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, Ccz2z9h;hv (s+woj u;+r wmbq * = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sowr v2*+ou s wb;hzhzm(c+ 9j;qurce?

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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 ind 2p3dxc2h6hr5s v bb8 an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10. bcd3vph6d8522rbs h x0 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 is yiy +-2cpt,v07qxcrz $63^{\circ}$. 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. Whn bmb , zw11:7z0e lunp-lty,dat is the power f1t1nwluzz7bd 0 ,,-p nyb:mel actor?

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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 circg a8 e4qprga..uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H gr q .eg4ap.8ainductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capg5y n:/ a9scfur mbem5eqls;.bfq .(7acitor and a 15-mH coil in series? a:/ .9b(lq7rfsumge5.eqm bs fy;cn5

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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 sen e6obk5xc0y,: d7k oq tft)t5ries with a 4.7-mF capacitor for a resonant frequency of 1)6to:tfy bqeocd5 t 7,k5x nk00 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 with a 3.7-mH inductor for a resonant frrju g 0qjw-z1/hkg3q1equency of 1000 Huw1 g0/-j jrqgk1zq3hz?

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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 resistor and a 40-mH cu9dpj 9i 2irw l9l..mcoil if the resonant frequency of the circuit is c9i 2pjw lu9 .dri.m9lto be 1000 Hz?

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