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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exce qd744hxb l m3:bb3xckpt

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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 statesuu.;a 0mj xzi( 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 a coil p,2zqvk b -1ix)bv p8e e9a+ig.f5wupproduces what kind of change on the induwvxe -8fbp.eb2 iuip19avk gz, )q 5+pced $emf$, 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 p30 pl:-w x*wy7 *xpkvyi *cnfkroduces what kind of change on the induc7*pxwyiy l*k x3-v0knwp: *fced $emf$, 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 8b(5gwik c 1vity+9shloop of wire produces what kind of change on the induced (+ck89hiyvst5w g i 1b$emf$, 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 froftjrvufi+jm +m); vl3xt(gz2274zts m 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 direcab0 jf5r7(2ebmp uvg753pm/ktgml .i tion of an induced current in a conductor will be that which tends to pr k3 er pbpmtugjmbmv. l52/0f77i(5agoduce 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 b*etuhz*omt 4n43tooio.z 9z-tnx .6on a horizontal table. A bar magnet is held above its center uoz4n*zn4t-x.*z9ob 36 t m thtio.eowith its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontala*4 a+* u4l6isfpcgs /vx) mkl table. A bar magnet is held above its center with its north pole pointing down, and released. Ascli a g6*x *mu4/k)lssap4+fv 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 whereql)f f3 m:rpj. the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of q : mr3).flfpjthe induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiepzo 0 yo*.noh0)z jre cvkwyj .)h;-p-ld 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 as the field increayo*o)k0py0op jj;h-hv c.. z -er) zwnses?

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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 maj;,ywkt p70gxt hql(4gnetic field poij;,p xtg04y7wlqhtk(nts straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increbg12lihv emn a4znpa-/4i/1 fasing cba/iml p4ig 21ahn 1n-fv z/4eurrent 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 enteringb o63zmg q2z9.a th0sb first. As the north pole enters the wire, the induced current will be (as vobh3tzm0bga2z.6 s 9qiewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoh1j)/g u/l.2kw..vdavos nnb se direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriu . wslkvg ../vbo 1jh)an/n2dentation 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 condf:j -gh54vwe stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustejv4 -w5dhgf : 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.f6 6iv.v yb 29hm :4qtbqxqhc:
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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 thycn-ulme-c .9at 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 fiep/b*t7jw q6o;f e l0 ne++lpnpld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mtvx++ :dwiufe: o2)6qmo hah 7c1ehc:oved northward at constant velocity through a magnetic field that points straight down. Make a statemen) 7chiha1eq:h w vc x+ d+om2u6fo:et:t concerning 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 bariac(0dyq 7,yy;5.i l-da 2g r-l(6qv uht vteb rotates 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 transform4t3soq +r)y irs

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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 throur ujc+2v(oczm53.yvxep )- k egh 60 revolutions each second. The frequency of t(+ po3cvc25 -y)emz .kxevju rhe $emf$ 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 devi ua1 t:u(ny7qbce 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 devqj rguz i*p:q)d*jc6 o3oy5-o ice 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 tnk. cpfq9mn*. he secondary coil contains more loops than the primary coil then it is 9n qfk*cnm. p.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 primarbt: 6w(ah9xmn f 0gfe4y coil contains more loops than the secondary coil then it i(gnh9e a0t6fw :fm4 bxs 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 inphptdo 5i6z j/:zo vt)x:deb 0:ut

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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 circ*zmw xp2yr4t6 uit,

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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 inducto bu1y x+4gj +bzae(+gor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro1bxez+ j+uagb yo+4g(ss 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 induc12yck 1.sce awtor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage 1y2ac1c .k eswacross 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 resista6 8ocqns- 4fdp9j3xyh*n0yf*yr qln9 nce 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 withuz3k7hw 1 (k*qh;m8ygvg , ztc zcyw0; inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batt11)k+cq7z .g(ab pw tvh gvsy)ery. The time constant for the circuit represents the time required+cwb v71yagpz1) sq v.)tkg (h 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 serib;2lw 9mvu.pr3uxt ir-a3-e fes to a battery. The battery is suddenly removed from the circuit. Thmrf2 ;p9t -.xu ue wria-l3b3ve 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 excti7qhv eqd+c/u-x tqz q/0 8)dg2nx ,pept:

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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. Onr:y + x zo;2xwhxc+-w4a) xclq 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 any1k,p6c6hbx( tl wn qt6 zh*):nglrr mv+e0v8 AC power supply. In this circuit, the currentq h0*vhrcmtl+nwre nkly6 z1v(g b)t:8 x,66p

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor whx 68fmwr7/ yhxen the frequency is xymf76 w/hxr8 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 double4-w)4jqlzx/lojvbwa-u 1 k:b7+tgpdal;mn- d, the inductive reactance of that ix4:+ol) -m g;v a /4k pbuq7a-l-bntdwlzj1wjnductor

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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, thr pgslh )qyy9x-e*f0+e inductive reactance of that es xr)gq+pylhf-0 9y *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 pk-8 uilp zodr6j- (an7ower supply. In this circuit, the curreouda z7k rlj 6-(in8p-nt

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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 changee kg; f/w1bai;s by what factor when the frequencyegfa w;/1ib ;k 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 gqwv9 vh mds98,iid) j/u4f (ithe AC voltage across a capacitor approaches zero, the capacit w9j 4viiqdf/s9d(h),gumi8 v ive reactance 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 i0hrp+mf;(r evoltages of the inductor and capacitor in a RLC series cirhfi0 +rmre(p;cuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC ciry xp*;u:xx:bx cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ifip 4qxt:p7w7yrg3s- 2hea 3 fs R increases. Whe4qp :sfi- aswxgh327p3tr y7en is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The zo,194woqz wrimpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Thexiae wnjb/a; ;cj2zmr ; 7:lrbyn687p 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 double in an LRC series circu br-k05 yj(zxfit, the resonant frequency of yk f0zr-b(jx5 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 AC applied voltage. At resonadji,2z 4h w zvwc8/su-nce,

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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 circuitm;t3c (2ge7pqeomnn9m; hh8n 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 rame6r /-3sp hohq00x ctdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magneh6-r0 e/m3s 0xpc qhottic flux through 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 radius 0.10 m is rotating in a uniform magnetic field of 0c(3yn dl(8ujchm,e, f t.1d mk.20 T. F l(ud,kmj3t. d,m1ec cnf (8hyind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.8 qsaujmsvfhxpz: +8g *z4 ppl/2t/ 8z20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldj2 l8sv faxs8z4/8pzg*ph:tz/ u qpm+ 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 adjustap (b (s1f kgl-7wilm,6b0lbhv m+gy j7ble 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 changes fr/hik,b(hm7sc*u sje/om $4.0 \times 10^{-5} \; Wb$ 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 wijw ,g7f+,ruve ,am7 0ybe*s qlre on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil.wa vsfg70j+,y,umq7,l e *ber If 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 are )u g0h od)vv7i+rj v/0wmv,aaa 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 anqqw h h1kl eo4,-2d4h+vhd(kwd d )wr5d 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 flidoyi0+t, jq ,des horizontally at a location where the downward component of the E+ q0ojdy,ti,d arth'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 rotates at a constant akv+.xfa2h f.z0ty m:mngular velocity of 2.0 rad/s about a vertical axistfkf hz2m:y +a .0m.vx 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 c)zjhd;simx)t+h69 k oross-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 turn,l:zwv;z-/fs)emo he6b4 qops 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 armaturejrnz 7 rj)+ oxaevf::). Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniformojrvr:fn )jea x 7z:)+ 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 consist:apc 6i/8 )y wynuhls*s of 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 simple AC gey01ga4 xz sh*r 2qllg+nerator with an output of 12 V maximum when rotated at 60 Hz. A magnetl1 rs2gzq0 g4*l+a xhyic 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 generator with a maximum ju,zyj )i )xxfq97h2u $emf$ 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 mo,(fc1v8dkwg ytor 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 eoa7 e )hwx;o6e -4pbpW. The motor operates on 120 V AC, and when running at ;wheex-o4e 6oap)b7p 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 1t,puz ml6a6-fji,t nW is connected to a 24-V power supply. The operating current is 1.0 A. What is th jaztm1t,fil6,6 -pnu e 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 connect hh y4d:2vzc*gpr tq-+ed to a 24-V power supply. The operating current is 1.0 A at full speed. What+ctp qz- hdy vh2:rg*4 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 im3qx 9vvhd+adr3o 0r)okz/n 2s connected to a 24-V power supply. The operating current is 1.0 A at fullhv/3a9o2z nqr o3d)r xkmd+0v 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 priup-ck an0 j(:m4k 3 yu)k9myowmary 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 tra6leq 77s*i um2pluck2 nsformer causes 14 A to flow in the secondary. How many turnslliu7ek2suqpm7c * 26 are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if um,zl gau28ym v cpy:))6c0efthe 24-V secondary has 10puuv)0,gmm) yy68ef zc2 :c la0 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 pr11rr6 8lwcp7 o s6jnjyimary coil and a 2000-turn secondary coil. ns c6opjr1yj78 16lrw 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 the primary of a transfohy)4.dp fwhqv 4 :g b:74bzqlmrmer. Assuming 100% efficiency, how many amps at 24 V c 4hglh7pdf:yvb q4w:q )4zm.ban 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 txq e7fexrq3fz24 r 4 -.2umwnt4+fij oransformer provides 7500 V at 10.0 mA. The primary coil o mtxre orfx 4-wf.qi 724 n+2u43zfqjeperates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on yrkvir, uakh:9o62 1 oits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in t1ir6hra 2 yv o:9kku,ohe 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 yn 3.w1is5 lpocoil and 300 turns on its second5w s.pyn ilo31ary coil. If 120 V at 2.0 A is 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 hasxga* -tx/ fc*y 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to*yfg*- / txacx 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 bjn hz.b*rc9u 67f*ecc ,m2 ch3:5qew *zeoxc turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vocco7bf2 zejmcc*cbze,urhnx 5:* qw6eh 9 3* .ltage 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 tranff.vzf* *qrg q;(su0tsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to b*. qfz;0uvgfq f*(trs e (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualkze q-l2ybs6v/v; nv8)v-tneh x: hv;ly stepped up to 4500 V by a transformer and transmitted through a power nh vk /yte;vh)sbqn -ez6vv8;l:-2v xline 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 volta w04t- +mxaabyge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance x04 ta aby-mw+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 steptt1 tult58 ,bm)+tthkn2o di0ped 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 line if the voltage is t)tb0lo ,nkth182m tt 5 t+duinot 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/j9( c5a ulgcj.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, ju9l(cg5 c/ja the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener*bf mo1tgv9f7s+ :/ ex-e4 hyk gkfiv5a17robator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmis 1yo fg41 *xog s- ebma9tb7efv7/ r:kk5hv+fision 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 1000 V. How much less poq ntwwxp1n 5y7,cl/v6wer would be lost if the power were transmitted a 5 7nnql/ c,ytwpx16vwt 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 transmittedajk ; jxjwqrm v.99g3, 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 ,j k9 g3.9jxrw vajmq;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 jfi 4d3th8s we f-8 l+3(vx1kgnvi dz;energy is stored in the coil's magnetic field?jvf ne+ i f8k1t3;dxg 3zhvdilw( 84-s

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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 mzh.ht8hal2/.) e q ,xb xkd6uthis circuit's time consd,hm e6b2/ 8hu. xx .tzhq)akltant?

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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 .h(9 ebblsbpkt ml4.*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 de,-4o :,tvf(:h5mymu ucc( hjcw 4ig peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the re7erqwjuul 73* blcb+(y)f.o n/ooos 4sistance of the lamp.eow*/ly o su)u7 of7lj3b obcq(+4nr ?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak currzfx/ cq :1olm6th+g k5kmc/c2ent through thcoc kmzlq kmcx2 g5:/6h+f /1te resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power m7qnew,q batc4b ekv8g) 23)dsupply. What is the power dissipated in the rbnq 2vt dekbcgm4 q))a387,weesistor?

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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- szckl+ jd6h6gy2s2qmgr)7 8s(to-z eW 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 resisto;juo)po -b +ntr 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 res(m xwjf1+oozo m 2mjadu7;2ro2c f)8v 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 inductorgs,w0+ns;nd1o4ogy4uj8 v my 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 reac9ev lw.( +whg8xd:y zctance 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 coip /h 7podx)2 knq(xb9bl have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductivea xfc exv)) s5aaip*pf58t/r0 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 fre;gwn e)knx(jhz57a- rquency of 20 kHz is rjkx)e; gnz(-w7ah5napplied 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-V,yba j 78ki4uw:b3zl9 h 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 o)s:kad/lp 5;2acnye-ao m *xsce 5;tkHz?

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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 atm4bt;h0 rp5p l 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 1igqmtmz- ;1p 1 k6;smv kw9ft.0-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 wi6e.wb qt0 -mfzz(sx (ell the capacitive reactance of a 0.010-mF capacitor be 100 W?tf.bqe 0em z(x zws(-6

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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 capa,hhv-*q*fs ek citor 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 impedancem.phgu3ig6 2 wht0;cj of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cihgh2 gjm.0cw6tu;p3 apacitive 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 1fe/qq/bf0vp6 rn 3s:k00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in r0fq e /qsb3:f6/ vnkpseries?

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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 1vh,,t)w7 (j:zfbh y(aq 3wj iw500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are)v,h y bqiaw,(wftzj7hw3(j : 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 xeerhn7)1k65vlmq 8nq l) i7vinductor, what is the impedanlkxe7 i8mql)nq)6rvn he 15v7ce 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, what is ,eq 33bi8v*phevvew9 the phase angle at 1000 Hve3bhpi vwe ,v8eq* 93z?

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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 coilnh27 ji-)4 vfuuq7hpi and 1.0-mF capacitor for a total impedance of 100 W at 1500 qnh 4ihuf)uv7i j 7p-2Hz?

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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/ul ypfj s du.9dlu6ksk2;(;u in series with a 100-W resistor and 15-mH coil kdpu/ s.ju u6(uds ;y9ll k2;fto 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 inductqqbm+o);aw yzfe1)n: p 7tjg(or at 5000 Hz for a total impedanceg y1fqop na;):ejmbw )z+(t7q of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series pi j1t- ,bopdoczs(9 8hlyj05with a 100-kW resistor at 1.0-MHz for a total impedance jot8p ,ps dbc 5lz9(o1 hj0i-yof 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 connectednyfc8z4 7 yvkl7u gh;03cu,wyp qk; ;4s/tssg in series with a 20-mF capacitor. What is the impedance at 1000 0kw kfcs huz,7nu3y;7gs lq4yp8s/;4v;c gy tHz?

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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 wi4xlvjdy56s /qv ;tlo ;th a 10-mF capacitor at 1.0 kHz for a total id x;yv6;ojlvlt q s/45mpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a gq 5qcp3zurob66oj7-5anb9m 10-mF capacitor at 1.0 kHz for a phase angle ocn6o9b 7- apro55jmg6zu 3bqqf $40^{\circ}$?

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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/ pzh qs3x99ns in series with a 30-W resistor at 1.0 kHz for a total impedance of p9/hzs3q9xns 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. What u9qxwyu( y(4lis the phase angqu yx(4y 9uwl(le?

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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 anony94/z ldjq e1luz,7d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected 1e9,nuq/j z 7zyllo d4in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-meb k4 k (nzg,hg+me hq2un+;e;6y mv6eF capacitor, and a 0.350-H inductor. Thegnmh +em6e6,ge zk+bv(nk ehy4qu ;;2 circuit 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 capacitor of capacitive reactance 30 W, and anzmx5g 5h ()vam inductor of inductive reactance 30 W are connected in series to a 110-V,55xg (amh vmz) 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 ang6ue cp*cuexs*o4) : sole for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup cueoopc4x s:*u*)s6e ply?

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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 se yo8oezxxp+ o:g,bv1/ ries with a 500-W resistor for a phase angle of ,x ogop 1xoz+v/b e8:y$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 2pr7 p8z:r2sy)t ngljmF. At what frequency zrs:7 tn2ppyg l2r8 j)should the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12 mn)6teiu(p eq+ xjm) m5i-y-f.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive -5in)fepmmtimy eu 6 ) -qj+x(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 ; n-7 kl.bl ekiecwsv gx/85ur( j7-cpcircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What id08 cu tf),:eev rrxh)s the powec8vefu:,rdx 0rth ))e r 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 50f.bi.rwu)e ) o-W resistor, a 10-mF capacitor, and e of) .iubw).ra 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 1.0-tb noxvop9 0ii1inh2 g2o:gj vu8; 5i7mF capacitor and a 15-mH coil in series?vj ou 9 2no:b2hi 5gt8oiniv710pi;xg

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needeo9 c+h)x lhw-md in series with a 4.7-mF capacitor for a resonant frequen h)9-ohxw +mlccy 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 ne 6fj-5ketf jx0eded in series with a 3.7-mH inductor for a resonant frequency of 1000 Ht 5xjf kfe0j6-z?

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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 idn+- kriz)d; 8yad7lfu;jw6h n series with a 30-W resistor and a 40-mH coil if the resonant frequency ofdnd-arf86jw d;l7 u ) hzik+;y the circuit is to be 1000 Hz?

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    总分:142分 及格:85.2分 时间:不限时
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