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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fl8phlz/aex4v9my y1-r2 vs n2w4q(k rsux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the , im ez0wj3zh6$emf$ 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 wirehpwnua(cl a,xz43s tw77dd /8 in a coil produces what kind of change on the induced8a, 7du /nzd(a4lwsh3pctw 7x $emf$, 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 qt0cuhlexb0* p m+.x6/hmqa 3of wire produces what kind of change on the ind6qc+htea .ub3 0 m0pxhqx m*l/uced $emf$, 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 diametec-5t ydhd+w5o)cx5jb r of a loop of wire produces what kind of change on the inducedt 5 5h+w )ydxco-bcj5d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fz7pp. 3b k jczpy4+kd:ield 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 inme)l ilokb ;z)e0:6h0nli kj2 a conductor will be that which tends to produce which of the follo;) 00m nlz:2hl6okeki lbie)jwing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heli:-(st,te9rqtf48 p36 z mqne*uhuag d above its center with its north pole pointing down. The stationary magnet induces (when viewed*ne3gtr9t u4pa,6fimst- :uhqe q( z8 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 bar magnet iss6uh w7hbxhm 52hqc9-t( 1 ntl held above its center with its north pole pointing down, anlt1 q5bhux s(2 nhh6cmwt9h -7d released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where ty)4m 8ab* 0qeopsq d(ec; s.mshe magnetic field vector points straight up. The magnetic field vanishe 4 ysc(0qo; ad 8e*pe.mbq)ssms 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 where the :n(7r3ylt04 qemtd lszb7s* g 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 this coil a n4qzgmy7 *stdr0llst(b7 :3 es 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 the3n w zgj1x6s8h magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dir6s 81hwgz3 xnjection 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 an ever-increasin l(i qg/2.uvgh8q4lhb g cuigu 4(/q82glbhql h. vrrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. A l) ns+.s)eaass the north pole enters the wire, the induced current will be (as.es s+))a sanl 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 i ro:g , o.grza3cn29 n*/a:9ejkiygkconstant angular speed about an axis whose direction can be varied. In a region where a uniform m3kr ogci ronnzig2ea* a ,9y.gk/:: j9agnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consty/v elhy0tt i(qo0m 9dl /5;.8ucb1j/ptdzbrant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poie9p/cdb/lb5d o1 u iyy0z jlh8.r/ttmq;v0(t nts straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.n*i dasua83a *
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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 te v9g)m7ts+a zdq 77hk bg+mm(hat 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. Thevvlrn uf,fhj, n0-aay y;0j 4. $emf$ 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 nor5qzf x06mbfc oj k1,v9thward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced 9v1zf m b0jfq cox6,k5across 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 constancbj+d eigsil :h 66/c2t 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 generatorp 1(x v(6k:uht4hahap transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequenp9+y (xoq1 0vlcdy-dw:d,zqg cy of the,qx(pd-+y0dl:9dcy w g1zq ov $emf$ 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 us1bn l5 vq1 w(h.rdli9ded 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 ei)bl8r +4,z l.ynsakice 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 con ei h:dph+u+:xtains more loops than the primary coil th+phe +d:iu x:hen 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 cbsj2bm04m 1omoil contains more loops than the secondary coil thensb0 mbmo2 j41m 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 o oe00.p;zkcq c-ex 6tinput

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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 resonanckxdh+ 1kb q/jx-p*j( t 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 connected in series to hswe6. (o.pczan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the .ce.hwp (zso 6voltage 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 serim8pkhe4za v8g za -9u.9y. dpqes to an ideal battery of constant terminal voltage. Ap9 vy qmhak8.az z.d 4eup98g-t 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 g lqkd m9/r,q2inductance 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 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 he 9 w/)8apbry(hgqqfd,6 ,f*se(z niand 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 indyxr4fsfbyc(,4u,ll o vqr4x fv.8+3suctor are connected in series to a battery. The time constant forq x 8f xyvu l3r4,rbs flc.4,of+(yvs4 the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batterq )zk/-8o wb6/*mrc0esa *iwq5+c kthv1rly ay is suddenly removed from the circuc +1rs b ame0t)i 86kwqz/* *q5vk-lowyah/cr it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excepi78 i dve4f1wct:

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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. 15i+ykj0i bs76hsi mkOn 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 czgp(5u jd(1nat6w8n dircuit, the currendjaz(5 wp u81tn(d6gn t

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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 fa2vhql)jy, e; zctor when the frequency is t; ) qvyh2j,zleripled?

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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 inducto9+0g/ dmhplta be;5 bodxb5i2r is doubled, the inductive reactance of that induhi2 b59/; o5 +blpdtmgxd0aebctor

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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 th otxj*h1 7y g;xhl1/jwe AC voltage across an inductor approaches zero, the inductive reactance ghyl ox7j1ht 1;jx*/ wof 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 7ftuwmmp) *z9y)q:s4uq3k u g supply. In this circuit, the currentu97 z)3 u*sqqwtyf4mm pu):gk

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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 yvx ln6tj.:+ 7-vg a o07jky(aixk3fvwhat factor when the frequency is trifli tony(v .j+x0a77vxj -6vgyk a:3kpled?

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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 akgsec/ j 1./wa capacitor approaches zero, the capacitive reactance ea/ s kgwc.1/jof 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 angl0/18h p gasqnse between the voltages of the inductor and capacitor in a RLC series circui/hssg8p1n q 0at?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined a1t9lznw 38uews $\cos M = R/Z$, 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 j-xby3 dv95*x7iyqsz if R increases. When is this statement iqs7z dxv*j 9-yy5bx3true?

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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 tf ;r(j //krrpfhe 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 inc 8y q4ib 3h8j(vltnz .y-n+zmoreases 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 in an LRC s21uhq emop.k .5xk/ dgeries circuit, the resonant xp2ge.o1qu5 h/km. d kfrequency 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 bil1 wek 61;ruexjf-p; a5imd+a3u1x jy 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 circjz.t*n *5o xncuit 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 unifor1pz,bshj 6-hfly3: wxm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie-sybxph :hzj63w, 1lfld 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 rat)gi ( fz 0b55ix;*uxp9mwe,ojazu k-)yy1 gadius 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 loop and the magneticuuz p g m5;gi)if)-axa*0o jwyzxe19ty( k5b , 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 uniform47nwgnydif,m4o an7s o9n47h magnetic field of 0.20 T. Find the magnetic flux through the l4 o ,d 9gm7so7n4n4af7hiynwn oop 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 r arh -mil:jxk ,b+p wx/q)f/)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 chanj 3 k.bbxgdh1:ges 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 squaacr4 dhk q4u2 e712prjre frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.5 p2udrc ja41rqh427ek0 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 r2cv8obk wdm y/;y 54kan 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 aipfs o :(9zt,* 1ekn sz,l5a:cdz:kpirea $0.20 \; m^{2}$ 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 horiaw,vk; yxya -n(2e qz:u)fty 9zontally at a location where the downward component of t:,wa qv);f2taz9kenyxy(u -yhe Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long fl: hwq 4m:ep3rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a consp:wq:34 mf lhetant 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 an0lb02 qm5zfd8xtt8e vd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirtigj 5uss *bdf-0x0. fe 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 it+ lmjswdi 8/;is armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallml8d/ ii;w+s jel 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 2m ekxfu70* i 7baikzv+xxa6c ( 1sl*pof 100 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 si+p* o*cfz1t -xxubcz6v y3b z*mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coiy*btozx1zcu*fzxp6b+ * -vc3 l 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 xvybj0 5.k:dni,y9e xqd i6)uwith 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 ylx/17 v1lcx lx -ix5d-a(j ivhave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a reso8d6c :) wwzr khg(y+kistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a zo wc rwky:)+dk6hg(8 back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powe wlt ydr9(a9;ome5wl j57 mvi5r supply. The operating currentl(wit5 aov;955y j9mdrm el w7 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 connected to a 24-V power supply. Tw; .-n7 ycvwh qgn7 4+9tfbyg,czod o7he operating current is 1.0 A at full speed. What is the h7ct vyn- o47+fgqwn,c7b.ogz; 9dywback $emf$ 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 resistwj .t*owt 0tsp,vu5u3ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spv*o0uwp3tt,t wjus 5 .eed. 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 p,dz7j toz:t(8j )aqd75ht/zax x5ana primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 x7x t dugrt)l)q1qq6g syl++8A to flow in the secondary. How many turns are in the secondar6qd+) gx7) 18tu lrx+ytsl qqgy?

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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 necessarg/il.xt n09vqz-y d 2yy in a 110-V primary if the 24-V secon tl9d-.vyxn02yqzgi/dary 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-turn primary coil and a 2000-turn secondary coirl7 y,5sgf c 7ipy0pu*gv:bp9l. If the current in thef,cpr p p7l9bu*y0 :7gi s5gyv 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 transformw0anb2ai9uh9,, uw z(h eyy f(er. Assuming 100% efficiency, how mafw u(an9hi9ye0u2y , w(zh ba,ny amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformeryt32+9 yv pj8phg 4ggl provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primar+yp hl gy8vj924gg3tpy 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 ona0 ,zmf,mg8czi5kai8 its secondary coil. If 120 V at 2.0 A is applied to thezc a,m,mk5zagif 08i8 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 it dt )+(ljn)h:7u im oaksrz*+ gvh;+q;goro8 xs secondary coil. If 120 V at 2.0 A i:i7v+g*( roq 8sjdk ;+ulto +)nh)gm ;hrxaozs applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns j154gt4cmbr j. If the input 4g jbt5jr4m1ccurrent 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 transformer has 100 turns ab.g,x )u bn.tkj1zf nms*4pr5nd its secondary has 200 turns. If the input voltage to the primary is 100rg.1jk. xu5bm*)bp nz f,n ts4 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 secondar q(1j0qii u/yay has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondaj1/a0yiu (iqq ry 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 s,;0lu or3qroj9 p-xhk (3kx zV. 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 number of turns in the secondq xk (3;k-xupos r3 h,rol90zjary 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 at5inhc;oe 2 b8k 120 V. The voltage is usually stepped up to 4500 V by a transformer2i58b;h nkeoc 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 vnj31 pby 3rnuki,t+,ooltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.yj1u,o3prtn 3b,+ik n0 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 resistance of 0.60 W. A g/j.uq k x45losg5lsu yw*e95generator produces 100eg4ogulqu59. w s5l j* s/kxy5 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the 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 kkl) ,qepul3zoyt8(9w,n4-mzngt/bnm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy le-wm 4,3/(qg9p8 obl)lnztnutzn, yk oss 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 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 2ht(o/q v(78kieu w/nqm0zys.b q;it1000 V. How much less power would be lost if the power were trans.us/qe0qi/ztk 8(mqhntb iyowv7; (2 mitted 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 4z c9 0r7bg/j: o(daryd40 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is ng: jardb /(7ozcdr90y ot 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 /rf pu7;m p0cnis stored in the coil'sup;0rmpfc/7 n magnetic 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 inductor. What is thi-ffm +n (*iksis i+nffk *s(mi-circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage rt*a :8bbf67u8c uhehin an 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 in+vq7 u(2j v;yptr4rv mto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed mb2hm1vv3h*j into a 120-V AC outlet. What is the resistance of the laj m v*hbv12mh3mp?

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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 acpl 3h*f45jf 7r(rhkd)uri8a n power supply. What is the peak current tr85h ur flp7*nj d43afk( i)hrhrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powszl 6dobtxe02 g9sr 05er supply. What is the power dissipated r0g9to s e6zbds50lx2in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 9etmjr)0l yv ee,(g)wis $I = 0.80 \sin (240 t)$. 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 xm5st 9:lanv,k+im dn3u y;u *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 res4s h*q 3rpd nbuqjdvb(0;do+ 2ed j.b;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 indhx;e5r6pnf b,ncp8jju8:u 5 buctor 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*s;zitnb4k 1u of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reacta:6gsemkr89t 2scqz u)nce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necei,2v qjo)c pdj- l8nf c9(jiso(nd)) rssary 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 whqvzs9795;,x ec iaa euen 120 V AC at a frequency of 20 kHz is9s,avei5u9x eqz;c 7a 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 d ) x2 ua;dw8b;1xlxx*9cxs yakue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor a8vd-z0 7gi.*k6ot-fvx d wfoxt 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 n..5a99pmw r vriiz 9q10 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 doefq a133j5qlpz s a 10-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,s2l. -p ,cty51kewjz icl -kgb:wk2a capacitive reactance of a 0.010-mF capacitor be 100 W w-.1y-,zl,ba25:gi2ke kcw sjplc tk ?

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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 a8k x3wrzi:)syt 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 05rl )q s)8p9txivl hwresistance, 15.0 W inductive reactance, and 10.0 W capacitive reaq )xil8)v wt90sphr5 lctance?

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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 imp39 a+g v fxljnbn)/1zpedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cajx af3+/b 1 pn9)gzlnvpacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100 p0b5/a 2lliow65vu sg-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?spg0ia /wub l o2v65l5

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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 20a buxel6f0 6o4d-ey(d-mH inductor, what is the im0f4 xoy6 6dla de-bu(epedance 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 induct2d: 7o om-sfm,o(iof aor, what is the phase angle atfm,o-sfo:omd2 o( 7ai 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 circuit with ao*f/:j0r v b(kkbl,*w/c*s)rnwl m ya 20-mH coil and 1.0-mF capacitor for a total impewj *ko l0lc/: s*m /kbavy) r,f(brn*wdance 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 in serievjgh xh)+xz05 3 -*ylc ov4dkas with a 100-W resistor and 15-mH coil to get a tot+v5v0*xa3y czhjdk go4)-xhl al 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 +,rz9 l4aqz2ngk+vl x in series with a 450-mH inductor at 5000 Hz for a total impedaznqkg lrlv4 92+a+xz, nce 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 seriesmw cl1uc5a*oca4d q* 3 with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW**5m13 clu4awccq dao?

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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 theq5s nhl6o,m8i7:g .o av:cmt9r7rk nu impedance at 1000 Hznl9q8un i5r.6 :h7mras: ok7,otv cm g?

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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 16qhx 6w+-4 em um5ontk0-mF capacitor at 1.0 kHz for a total impedance of 45 oe m56thuq -n x6mw+4kW?

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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 kHz for a phasy/0cy 2k kz8 equzrby hh25+s t7+sh2ue angle 8rkcub2+5 te y0zyh+qhu2s7sh y/2 zkof $40^{\circ}$?

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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 ; d,bgd5t y.wiat 1.0 kHz for a total impedance of 45 wby td5g.;id ,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. Whaq +t2oc,tb(3f i7lwu,gitz : d3hi5sf t is the phase hsi,tl57qbuoictd (t,f 3 i3+fw2z g: 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 Hz if a 100-W resistor, 2 t)jv,3(e,wjnx gor+yw(/gey0-mH coil, and 1.0-mF capacienyo/ tr+y) (v g,ww3,gx jje(tor 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 u0l cm1nl5)kwconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60- 1nml)5lwukc0 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 capacitor of c;g8s65 y)cislr z p2fkapacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cuz 2r6 slsig 8y;c)5kfprrent 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 ser.d x+: jnyi5vpies RLC circuit containing a 50-W resistor, a 10-mF cap+x5jynv p:d. iacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serib/s w;.x )ptjfes with a 500-W resistor for a phase angle of txj.s/fp ;b) w$40^{\circ}$ 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 ifkkwl:mm0/ .r6q- itjxew 1gm2 w+ 2a= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power trae 0 l12.w+wk2wmqa/xt :ii6rjfg-mkmnsferred 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 outpyfxan p*wnh19lt:fp 8b +dq;3ut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sup: bxd+ twfpla f83nq1p *9;hynply?

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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 Azsqomn+48pr1j9k:nb v m : l,mC circuit 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 impedago /0awd, q8ipnce of 60 W and a resistance of 30 W. What is the 0 /pwad,8 qgiopower 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 RLz*j8c0(te9e o0a g xcpC circuit containing a 50-W resistor, a 1cc0(x0g oejz9t8 ap*e 0-mF capacitor, and 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 2 rk jt*6*v*7lqo sqxna 1.0-mF capacitor and a 15-mH coil in series?qt nqs26r7* j vkxlo**

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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 serdpn; 0d9y 4daqies with a 4.7-mF capacitor for a resonant freque0dpn;ddyq 4a9ncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needeh/ d;8ykq 11umozljjf( vd54od in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz h4 o8mkv;(ud1qz f1dol5/jyj?

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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 placedyu5 i/j8,z mmo in series with a 30-W resistor and a 40-mH coil if the resonant frequency of m, u5oi8jymz/ the circuit is to be 1000 Hz?

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