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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 magneae h u(7w6qow7ppu/(a tic 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 )o ; bgbg,x4h3eq+swb that 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 uz*9 /or-bktp a coil produces what kind of change on the i z/u bo9tr-p*knduced $emf$, 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 fjpw(5uo2*l(b-dw s l of wire produces what kind of change onwob (plus-jlw *f(5d2 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 the ixsnt whsg26( s1)nt 3mrck 1h13-drwqnduced mgt sknxnh(6 31q- h2wr1t)3s1r csdw$emf$, 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 (3*ckk xm+sp dq)laecbz.8j7magnetic 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 i cvn1qpc 0xx;,n a conductor will be that which tends to produce which of the following effects?qc;v1xc,xpn0

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovi(q( k; jtw.sae its center with its north pole pointing down. The stationary magnet induces;w.at((s ij qk (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 vo,-q4t(ha (ml sa zt3rdo m()w9nx m8a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fanxaz4 ad 9)tom3tv h,l (mwrqs(8-om(lling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnvued8f(2m3/rvh 61g9sap ungetic field vector points straight up. 2d r(v8361p fn egumgau/v hs9The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region z*6+eq3jl8qa o2bbp cwhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fro3bql 2 aeopq6*8zc+jbm 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 region where the magnetic fiey388 ophi ldue7 6rky-y1yv.old points straight down. The magnetic field disappears suddenly. When viewed from above, what is the diydvouy h7pi868kroly.3-e 1yrection of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries anp;0f2 j sri4g)dy/lnu/cr jd- ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewf0jynl srrgdd2-4u/c)/ ;j pied 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 through a loop of wire with the north pole entering figj * zwg- (/ bjyo110rmjc2gghrst. As the north pole enters the wire, the inducogjg *gg(1y-2j b/jrzh1w0c m ed 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 axns/j +-hpf p1qis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientah1f-sn+qjpp /tion 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 axis whvlh03ccwfh d(7fko0miwsb1zd 2 )1l/ ose 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 rotationlshczwliko h1d)020/ 3vbcw17mf(f d 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.xn-eigchb24o b q h7 a,vfu(.2
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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 nsv+f *pz)r6jty3/ zaat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. T,*a k0gq/nx lqh+1u1 0viyoibhe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at conqtj ubes 6vkarj9;./-r44zynstant velocity through a magnetic field that points straight down. Make a statement cjr/649vkjsurt y qb;ae z4.- noncerning 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 rota6sj )h9z/m)xsfg y2 uytes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator y1vtdr8g g)twvf /2z4transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each.simo yrv(. wvds53h- second. The frequency of thdv.h5 y(ss-3om wv .ire $emf$ 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 dev :70qg lcqvfj8:. owunice 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 devi1-w2impc (c16r a0tte glhkp)ce 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 c ; 8237tez xkvvelow9/ucyy1more loops than the primary coil then it is ywcz ye2819vtx 7;lkv /uo3eca

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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 mob+,f.ru es fr ,auu+7hre loops than the secondary coihfuaesb ru 7f,u.+ ,+rl 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 power input qx4ac4s+ lfyic)k28z

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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 b6mnccjr ;0)d circuit,

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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 connexbsi4so ka,+(s))+ us7xe aspcted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is o()p4i +7a)sbxseka sxu s+s,

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ,-qr.fy79 0cpnple ru fih-s-ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro9 irpy.p hr7-q f-fc ue,n0-slss 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 ht mg0x y *r/ eskgsqt)3a356cR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resisayll6 mm2uq i- ;e1m+ptance 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 co;1tcz7xwi.ou nnected in series to a battery. The time constant for the circuit represents the time required f. ;x 1ozc7tuiwor 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 bl n-4n :-m*yiszpv8 rp2cnyo 5attery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreasi:nlvsp pc-n5n8-zy2m *y4roe 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 ys r(xwx9;*a;g l3qhg m.8muhexcept:

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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 st89xqxh/.wil px 2:bf upply. 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 circuit, the cuvpwq42/ clsj4 rrent 2pvlqj s/44cw

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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 byf 7pb)mkav4y /n-tl+z what factor when the frequencn)fya /t4mb7 p+lk-zvy 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 z9k6j bmac3vdu ,j kji- h+zeoy,8s72ldrd5)inductive reactance of that bkrz jv96d8,)ky2-e 7jo l+j,dc ahis5zm ud3inductor

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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 inductorj :mrt,sqw3.oa k. ;rf approaches zero, the inductive reactance of that ct; akj 3 :qo,fwrmr..soil

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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 con30rho 8zdk olpk1,qgtp. j;.tnected to an AC power supply. In this circuit, the curre13j.ktp o8h .zqr ;dlt,pogk0nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor 3blaox1l a-8r when the frequenlx oa-la38 rb1cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor apm -95x 9knqqeaproaches zero, the capacitive r95qxk mq -aen9eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltage i8 refoqr//cy:3k1sl s of the inductor and capacitor in a RLC series circui: rkqiof/cyr8e3sl/ 1t?

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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 anbl ,k4n-zrd;p ou7x5b RLC circuit 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 i6v y.hhjes218n3me5,3k x*i0u/ ukmv mzdikompedance of the circuit increases if R increases. When is this suh,j80kv ydk.om1*s 256iexm/kziv h m3n3u etatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increkn +u* cl8n7aaases 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 increaywbk6+;/c tackc.x a)r , uro;ses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in9elf+brw-:r o uebv+meq4r8 1 an LRC series circuit, the resonan - ebr8re9+e :fmulb4+q1ovr wt 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 an 4wf/ot, (ow15d4 seiw: hg tqzf)*gnt 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 cil)aipc s2ic77rcuit 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 magnegxn oe5 o:2is2tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralliegos 52xn:o 2el.

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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 .td,g vrs1;pfpv: zt+in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnv v ptdrz s+1f.:,tgp;etic 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 ro)ndj9pt :(-s* nx )dqrd grle7tating in a uniform magnetic field of 0.20 T. Find the magnetic flux t:9txe rpn*-sl7)jndr( )qddg hrough 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 arr)7h0qv*:jkjzdq 4 sv ea of an adjustable 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 changesly*4eamoxqpi0na;c x-1*vexg ) ip 32 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 nn+de+1 p;w mmcda6(6tdkbz4 on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find6 acdn+mp4d1m zwnbt+e (6;k d 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 wig(*e r n3r9xyith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ai*dvlb uhhz*,l i q6b4za y7;-rea $0.20 \; m^{2}$ 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 horizontally at a loca rc61v1vj rzpn:1 j1ixtion where the downward component of the Ear61zrv1 r1 :v1xi cjpnjth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.mdt*mdz, d 90b;*om7)qusb td0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical ,;0d)tm oq sb9mmd dt*bz7u*daxis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional ar ;bqhj35 dl l,e:a(bgjea of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area,0klvrt1g3 vdown 1 +e $0.090 \; m^{2}$ 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 ignw85i)dec i-ts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the ln-)e ii5c wgd8ong side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of qqul(szx iiibq/q6. jxvxx5 .530ip 6area $0.090 \; m^{2}$ 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 generator with d(h.erdg ag3 7ei):cuan output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0d.7:aieh(gr gd3c )ue .050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with j 6y(k8 hkls5fgc*5stf o;8;slqs1 isa 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.5xr y):4m :m aghk4emz 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 a resistance of 6.00 W. The motort w a.-pv7 )ixrml89guptm ,mlui5b)) operates on 120 V AC, and wh8rilgv ) m9l 5ip)x.taum,-mt7wu b)pen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2 6jz*drms4z-q bla v tptb*ge3:/ 7n6l4-V power supply. The operating current z/*rvtnjqzgmbbe-t3l: 6s pa746ld*is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectyx2g z(y/m kdnt8v9 :yed to a 24-V power supply. The operating current is 1.0 A at full speed. What i8xgty : v2yyzm(/nd9ks 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 power supply. Thx+-3la;ollk5f 7vdxi ,rie h8e operating curre;idf+l5,ol-kravx x73lhi 8ent 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 primary voltag (an0n+:lf+x /tf+/mkp/ zgjiv r* ypje 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(imd2k2t ;vcb ee8qc pi019 hv causes 14 A to flow in the secondary. How many turns areec19;p e (0ib22qdv8ikc vhtm 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 primary 8 dv19ub6y- qmqktr+mif the 24-V seconda9kvbdy6t+ 8m1rumq q -ry 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 5a daz+c22hj ft o8r1-n00-turn primary coil and a 2000-turn secondary coil. 2d r c81nafjz2aht-o+ If 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 tw93z,sde80nny ,8f yf hkp,cehe primary of a transformer. Assuming 100% efficiency, how many ayeed w,y9 3 nhf8cp,zn8fs, 0kmps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10. s s/te9hp-gqyxub; .1o1zx3ak*bzq ,0 mA. The primary coil operates on 120 V. What does the primbx zx/t sb3,s-;gqe9.ka zphu*1oy 1 qary 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 turns on its secon.tewy 0jgs:w )dary coil. If )w0.g:twsj e y120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seb g9k.f*m/ly vcondary coil. If 120 V at 2.0 A is applif9m vk.gl*by/ed to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 g1inv- dysj ,p- ;7poh,nkt* titd/7vturns and its secondary has 200 turns. If the input current at the primary is ,o n1i7 *sjtvd,/y pk7t;v -gdhi-tpn 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 turns and its secondary has 2ulnem v,4:y0i00 turns. If the input voltage to the primary0mlyn4 ,uiv :e 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 turns and its secondary has 200so vkz; 2ych1+ turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fricti 2vy1 ;ozchs+konal 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 currenv vb9+(8t b.ey 1khvitt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1vb vi1t v9t8h+yekb.(.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*tgys4s s fb+5ped up to 4500 V by a transformer and transmitted through a power l*45b sg+ssyft ine 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 cuj2wb57. tvnnqrrent at 120 V. The voltage is usually stepped up to q j 7bnwv52.nt4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc1ux.xp0b)g f0 gwa8kg( hz ml-2cu:bhe of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss wgg 01b uz(mk g-8)h0pf.2bxl xa uhc: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 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 resista5vwxv +it)ny+nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up withtin5)++vvw xy 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. Howl d+x0/c4s1rmeysq ++nk7)lo /fmxvv much less power would be lost if thm/esxqks1+drv m l)c++nf4o0yv/ l7xe power were transmitted at 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 tib(j0.h 3t 93 f0;nhpjygcu9ab) vibwo be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with f b b30 pjuvchy0ii(;gwa3 j9.n h)bt9a 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 hn)xym/3ps+g5c zyg..0 A. How much energy is stored in the coil's man3m)z sg h./+ cyygxp5gnetic 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 resisq w;h3v yehb:n*bi. u/tor and an 18-H inductor. What is this circuit's t/h3ebwq i vyu:.b;nh*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 lw6n800ldc pc AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cur u*r*xbm1( .z6k x0c qlehq3(hyt kql+rent?

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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 outletmrn6 fl; (le7j :hl,q tl8wkk*. What is the resistance of the lam76,: hk8 m*nrkl;l jtl(fl wqep?

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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 connecteoangly 8151r sw2 cps/d to a 120-V ac power supply. What is the peak current through the resin 15 so clrsp/w12gay8stor?

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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. What is the pojyk xcp8(g,b 1wer dissipated pj 1k(8bgyxc, 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 5np63kppt q/06xxn *ik0-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 resistor lado3 bq8i4 m6is $I = 0.80 \sin (240 t)$. 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 resis9j9 hzqf95pf utor 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 1.0n -mczef,(tp a kie:0.-mH 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(rxdf0y js: kfj:y: lkw3p2f, 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 14a6ls /v8 eczd;.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 nemx,p79o5nxxy cessary for 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 frequency of y7r87*o+ sjspexm*f r 20 kHz iss7srpm+jy* rf *87 xoe 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-mH coil due to a 110- uc/eq);bzq u.+s sz3fV, 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 vau3 j5z1 pyx.reactance of a 4.7-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 have8: piwiasnl)5 ql.xp 1 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 10o2 :)vi;.li* q4gaplgnp1 pp.vzc8k m -mF capacitor 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 capacitor b ydn21;tf6 7gd:pdf d7l/ phxne 100 W?l7 d/;dp:d ffg6yn2 nhp17dxt

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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 a sx/vpymnj7- xyyu8 -0t 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 r*u0- 3dpf8 lhw(-fzmbt bi2peh* 2oaf esistance, 15.0 W inductive reactance, and 1022 pu38a0fbo f dfpbmwhh(*-ltiz -*e .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 resi7w0 8 +x lx3tzdegsj2istor, 20-mH coil, and 1.0-mF capacitor are con8lx+e 7dwgj3t0 2i sxznected 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 ak: 1yk-z -yo2ql c7n9zddg9sd:p zu)kt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capz9kpkqs79::u2nzdy-1o z -y gcdd kl)acitor are 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, what is )h dxb)lus*h5)djru6 the impedan*u)ls) x d6h)dbjh r5uce 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 inductor, wha)br4z0j0nbopm bz6o,( jc+d mt is the phase angle at 10000,0j( o4djnp zzrmb+)ob cb6m 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 i8;fxkh vnv/; *b3 arnt.cj3 fln a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanccx3*n3l; k ;tbfh/an .vj8 vfre 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 in10guymx7s 5t s series with a 100-W resistor and 15-mH coil to get a total impedan1x0t7s gu5ym sce 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 : sega2o2pehk7r xn- /yuvp0*450-mH inductor at 5000 Hz for a total impedance of 40000 Wray-upv7 eeh2o s:2pn0xg*/k ?

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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 resis3/ cm+ o;ysfantor at 1.0-MHz for a toy +/s;afc o3nmtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Wnbx u*fi0pa-r4 zd 6u** p9vfu ,fob6ahat is the impedz- dabfu6pa*run0i pfb*4 * ou9v6 xf,ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cap /nq4q()j sji61 )lvig5lrasiacitor at 1.0 kHz for a total impeq)irq i6)jilg sa1vjs 5l/ 4n(dance 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 ne,g q+; tcw3t/ 0g.r k5exukwfeeded in series with a 10-mF capacitor at 1.0 kHz for a phase q/w,xk 3tcwr 5geuft0 ke+.g;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 a total8rj zdsz) fz bp.a:,k,baofl3f6 db,; impedancs d,f,zkz)bz68f ,;pb b:ao3lf jd.r ae of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wd2eo/wbjll2i.b b7dbslb no-1 1cle9a ;)e* zhat is the phaseew2 nlb ;)1db.b b1a7*io /cbldos29lje-z le angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hzk6 2h m(e m08 epjmescw781fbd if a 100-W resistor, 20-mH coil, and 1.0-m sm71 p0j28c e8hfd6kwmee( mbF capacitor 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 res1h2u2w.eg u2- pjluv*ers 4 raistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current ijerpul 2 ws1-4.ger2v u2h*uan 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 capacitjk( 54-dlhoifor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected i -l(oj4dikh5 fn series 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 a series RLC ryhgp ) 7n9-amcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6-nhyr)9mp7 a g0-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 necef4jsau 2.t +cw+ lhi/sssary in series with a 500-W resistor for a phase angle o/+.h4 s aj slf+ucwit2f $40^{\circ}$ 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 tt 8)(w ogx; g4trpqr)1ohau9 R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power trt o84gu(t qt;p1rox9)agr wh )ansferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance tko5xm jil*g207qvc6r 4x;liz: c:d m, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12:lkoq5:0i7lc2m rjg mz6*iv ;c xt xd40-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 circu 0r*hq0kr td,v sd1uj a;pp7t5it 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 s gd(-bc br)(isvq28 lws1+fc of 30 W. What is the pdg-ss( 28 l)bwsc1+ (vbcfriqower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resiesqnrx1 2 r8livq/ d()stor, a 10-mF capacitor, a ls)xdr8qer1qvn(/i 2 nd a 0.45-H inductor, 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 1.0ot)ues40u pw ;-mF capacitor and a 15-mH coil in series?tws0eou;) u4p

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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- 9j;/rt9vctdsrjpjg ; hw 1(r+v5q +huvg6oa )mF capacitor for a resonant frequency of 10 kHz9j /aso;t p 1)9hjrt c5gh(jvwgd ;rrv+q +6vu?

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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 resby))ji/0n tf2vtgn:p rz0ag1 onant frequency of 10b trtg zi0: n p)0ng12j/yavf)00 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 ,n 0pe)1jowdda 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is 1o)ddep0j,nw to be 1000 Hz?

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