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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 fluqlfcmaw5b ))63 tjs obp(0xw/x 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 inductt; 4km;affth)fo ; cn6c :hx07vlkpp2ion states 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 producy-7y 2;h ky hutu o299htbf;qtx2f 3wkes what kind of change on the inducefkyhu9u 793x-wfhqo b y 2t2k2;t;tyh d $emf$, 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 throughk0dssj /,96+mgz 5mm i6yo .wgmdxw5 k a loop of wire produces what kind of change on the inducxo6i/6m+w, m5m0szgg5j sk ddw k .my9ed $emf$, 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 wim :;y1mjlbk/ i1y9 ocpw c7l(are produces what kind of change on the inducedc ojyiw9(c1b7 :;1k/ mypllam $emf$, 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 froml7a;vu : cpim 29loa9m 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 direction of an induced current in a conbix(tov + +)vn)qlj+hductor will be that which tends to produce which of the follx+vtlv )inhj bo) +q+(owing 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. pfxnjwr3rk5/kc .h (/ A bar magnet is held above its center with its north pole pointing down. The stationary magnet indx5/hrjf pc3 (w/nkkr. uces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetaf w4cu u 83cqd1/0qbo is held above its centerf 0/8 oacb341dquqwuc with its north pole pointing down, and 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 the2 8mfw,du uexq* 1w+0 pwqrm7r magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced c*r0w+1e 8mfd,m7 uqprq x ww2uurrent 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 mag83ify5t k madb1 saw26netic field vector points straight up. The magnetic field suddensw61a283 mf5 bta dikyly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizod w re 3y ppg).65qfpv/v(.fnontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currry v/p5fqw v .6g3p.p( eond)fent 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 horizontal5wd1ocxso-s; c rrm; 6tk4i:f table and carries an ever-increasing current northward. Two coils of wire lie flat on id ;5sfrw : kr-;61s xtoccom4the 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 wir 9qdnj 4a2p 0ge)ew/ibwe0a :ze with the north pole entering first. As the north pole enters the wire, the induced current will be (as be ee)2p 9jw40azandi : qgw0/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 angularvnm,a , )zd:zb speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's b)dv,zn,: mzaaxis 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 abouqx19kk, r0 jimt an axis whose direction can be varied. In a region where a uniform magnetic rk9j0ixqmk1, field points 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.msm x ;cm5+kl1e1,m0 zzd2hmi
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an pme 6p5g.bkb5hn.2 yhrw) n( w$emf$ 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 magnuw*qyrf.fc)clyf vja - ,7*el94pr8 d etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west di.7 nwai9q no9hrection) is moved northward at constant velocity through a magnetic field that points straight down. Make h7w9.ino9 nqa a statement 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 bar rotates a6*mzxdl+8z antyee0 s 1w*; lot 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 transforj ,+u1wc:;pdtp fb2 rlms

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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 th .+rt (nwhyk35pre2 ryrough 60 revolutions each second. The frequency of t5 (ykyr2np.w rh 3r+tehe $emf$ 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 den sfpvlx.d y,99j9 jqe1d28b pp tkt15vice 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 device4x ,mn/vurg5q/w5ko c that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary coo0ev-bd i21eg il then it is vd0i-e 12geoba

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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 csvzo1bz/h) 8os3hek b:oq 08j oil contains more loops than the secondary coil hhsbozjk )zq38o: b108veos/ 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, ther 5o +h/n/coyw power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circum k+y+ i/euv zigaawtm9p :5hci/2 x,/it,

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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 ar yi kf8znec6y4 *as2z/e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resisiz*k n8 /a4scyezyf 26tor 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 ino)g:8z*ig .qsb nf(3qcq5igbol:nx: series to an ideal battery of constant terminal voltage. At the mx: (q:il :cn8io*gqgz3o n gb.5)fqsboment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conneurgpx3t1-a1 n cted 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 xc+ j1;kjv3.sdlo/w+6tjxmw 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 areljq .yvfbn2y5f0/7 u f connected in series to a battery. The time constant for the circuit represe 7quyf02/nfl.yf vb5jnts 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 battery x539kkmi e08z wolt ,ris suddenly removed from the circuit. The time constant for of the circuio e xz,mw3kkl8 50tri9t 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 excepgsq0 rk5;cyoyn/l ,,w4xp ls (t:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit.*4vjv,59p o smigy yt, 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 conneh4sc2 p(+mm uccted to an AC power supply. In this circuit, the currenm2 +4scpm cu(ht

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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 when the+adn0;dg pg2 drz2 hx; frequency isd; g;20daxgz+hp dn 2r 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 amda s pb:f 4c7c5 a;tjw11iiu-cross an inductor is doubled, the inductive reac5 ;1c:i wspai bda7fjc t1m-u4tance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC v b7aed6d 95f/z tby. lw,kt4uvoltage across an inductor approaches zero, the inductive reactance of that w ae6vd4bt97f.ty5 zkbdu, /l coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In th:rnplox cyjg1p.g 6w, b3ju :0is circuit, the curre.pj6w ,jg r:3b 1noc lux0:pygnt

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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 ip1 6v29t0gne;dmls ecircuit changes by what factor when the frequency is tripled?s e0 pt2de6;gn1lm iv9

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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 apptni:3b(e a h*proaches zero, the capacitive reactance of that capacii :banh3pet(*tor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the i6w8 enf9a/w fsnductor and capacitor in a RLC series fw9af 6 s/ne8wcircuit?

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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 as jltwce ol5)7i28a w p+$\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if Rdqj +czjv-9g a14zi4 z increases. 1gj+4z i4z zj q9a-dcv When 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 impedance of the circuit increaslxb4r)b fk3(s es 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 i-/gel)gwy1tyvc hj9a jm-*b6 ncreases 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 doukqx7( * 7luijmy/ lq5kble in an LRC series circuit, the resonant fr lqx7u(yij/lq 7k5km* equency 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 thay+.hucao0 a,i 3l0am+2zk yaj t is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurshq)xljr3eb: se73 zx* 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 ing y3 xm0)dc6za a uniform magnetic field of 0.20 T. Find the magnetic flux through the gmdx0)y c6a3zloop 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 inb hfd,-wf o3f/0uri7mv8sj k4 a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the 0w3 84fh,brsuoj/d7fm-ikfv 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 fin n8b1ritydv .g4a1gh4oj9pn , +e9djeld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angl.a9odvn9rp1,81hdn +gebi tjjg4 yn4e 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 adci:ed) 1,rul mkfl16ejustable 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 from :v +as)/ h. hyt(gziptcp 4:ldn+:py d$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Am5jrrjzfhp4 m* )7lm* uniformh *zpf 4lr)r7jmmm*j5 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, 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 a0t d/j. +kxvm gbk66s )(oov 1mheytg9n 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 area i4 v3vhb.8 aec$0.20 \; m^{2}$ 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 lodiv* 7:qe+s8 kle w7lrcation where the downward co*w+ qsd r7:8 7levlekimponent of the 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 rotates at a constanl 6kxzq9o6f kji,pa)ss k0z.8t angular velocity of 2.0 rad/s about a vertical axis through one of its en 9kqj,)6k zz loxp0. f86siskads 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 cross9pl.z;re4 qyy -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 consis+ug; t q)xzl4dts 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 $emf$.

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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 looprd cairao(mu+2 8 )i)bs on its armature. 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 uniform magnetic field ofbira+a(8))rd mu i oc2 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 turnqzsx n; 0.rg(l1mwxx ,s 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 const13a0ph yh8fw,t i/3f qw0 nniqruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t3nyq8t w/if 00,hnfa1qp3 hi whe 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 genera2x o+j0yzhx4ajocoh 7)pe.a9v *uaz- tor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance z y:h5qwb- + pfhv-*uvof 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 motorzq4xkw+.+ ,:laj0pj an qwgp* have a resistance of 6.00 W. The motor operates on 120 V AC, and when 4qzq0jp*a.k+n +xg alwp :wj,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 24-V power su 20edwp6jo8x bpply. The operating current is 1pw2 box60 dje8.0 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 b3*qaj q)ez (t6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What istbq)* az(j3qe 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. h.kx*pdau 01;hrg4td 0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wh4ht1;rgd kpdxhua.0* at 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 bwj hf d ; 0ozukr:/4wdd:8)tsreduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A t kriyirf,m.)v94zc 0 mo flow in the secondary. How many turns are in the zfi)r, ck. i9vmr4y0m 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 i b69crjobtv/ 5n a 110-V primary if the 24-V secondary has 100 turnsvbb r596tjoc/?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists v io3q7lj2 br,of a 500-turn primary coil and a 2000-turn secondary coil. If the current inro bvi3 ,j7lq2 the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. gr (v6c:u4je c Assuming 100% efficiency, how many amps at 2 4gjcre :c6(uv4 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 10m- y-afxe/9ypq *pcz).0 mA. The primary coil operates on 120 V. Wha9x y)cy pz-f-q* ma/ept 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 its primary coil and 30l ,qut55pou0nzh / ap50 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the se55a,0 hlo/5unzq u ptpcondary?

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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 itp8/ wdz *c zziko-g,l.s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in th w*zgp/ zkzco8-.i,ld e 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 hau5g08pikixj:e/l m5m fj 5n+nxh7y/ys 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sec5 lnjgpxykeijh0 8u i5y+xmm5nf/7:/ ondary 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 izo ,lrc56sh4 4kpq dynm3 xv;+mi l3c1ts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the se5y4q +31l,4mdk6h cx rco3 snpilv;mzcondary 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 smag j- x2c-+ijecondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (n2ga+jmxi j c--eglecting 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 120xu -it0/pb tsvq, tr-1 V. The voltage is usually stepped up to 450bvs tu /t,t-qxp ri01-0 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppflt53rl9c q,b 3iwd9aed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost iicld 9b9,lrqft a5w33n 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.r6u z- pn./gacu ,don6ovsypbg(.1 1u The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepa1 ogb spruc1 .onnd.,p-yu 6(uv/gz 6ped 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 3*lp+qgklk8 u long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the+k *l 8q3lkupg 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 lon2j7 4ehg)s p8(yxnmpqzxmv *q/j- t( fg has a total resistance of 0.60 W. A generatorey)x2z(gp4 mxs7pmj-ht j8q*(v q nf/ produces 100 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 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 power would bce7ik o:bl3f7 e lost if the power were transmitted at 3000 V insteaie fl3oc7 7:kbd 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(ezl c9 v(tsbnmw1v;* 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must thes*bvc 91;l (wvmnzt(e generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stoks44bjfv0oxxb : 1 xp:red in the coil's magnet 4o04: bx kbspx:1fvxjic 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 containtao+t29f 7j.uufv 0wxs a 6.0-W resistor and an 18-H inductor. What is this circuit's time cons w+ff.a2ux9o 7 tutj0vtant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volt8g )2wj,6 po*hqfzun yage 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-q ynczj4)7ovdw+fi x v(v*c*. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of t 6 jr(qyeghsezu9eqg *v.i,a,1 js)3 zgjtg30he lam s0e3jr6gj3q eeiyzs u 1.aj,q,*g)(hztg9vgp?

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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-V1 (v2twk *uw f lm5s,j5yson4d ac power supply. What is the peak current through tywtl5,j2*o d ks fs4wvm1u( 5nhe 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 rgjd,0 (jl-o fsjg 34m120-V ac power supply. What is the power dissipated in the sdjgfj3 0(o-rl, 4m jgresistor?

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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 zhlv7wv*: rr/,r wdk-n7hgm0-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 1r wkho9.3aor5d3yc6(nzh e pf*ke. zis $I = 0.80 \sin (240 t)$. 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 resisb e:c 7hzd wkg4zqo-5a/4lyo dh90jq4 tor 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 w9t3s+w8 k dbbh1:fel-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 2.50-mH coil at yli a-huc618g yr j9;b1000 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 reactance? sqq8b1 m*te 6kkm)x0 odm)p:g

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a*7pj91 nz fnq+qcj8 jrt 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 20 kHz isg+h92x/u dif g applhf2 x/ +9gguidied 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 e g94/llofn ic kj 8(q)-rn4srcoil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactcy gv7 sy258rdgk8vn/ar4+x mance 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 have 50 W of capacitive reactance at s*lv./wkn qq-;1ucydhhcy6ib 5q5u1 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacit8k;.k+3nepttljih 8:(wboy8 8u xvi w or 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 c,+k/ jv(qs6di8lq razb 2hpc;apacitive reactance of a 0.010-mF capacitor be 100 W?p6(i hd;,z/qqbjsl+ 2 c8kv ar

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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.m qa*n rp4m81l0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W ingi n6y1x3iy/ nductive rei 6g1y xy/3nniactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20. ya839 1)ekdb6f,wkjxve d69qxkej b -mH coil, and 1.0-mF capacitor are connected in ser e9xek6)ekbw 36j9.8 kfdaqd,y1 vj xbies?

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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 anglo kohmt2av6)k(p8ww1e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are owaw(2k1 6omhv) 8ktpconnected 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 ,. 9uglrzyqw:is connected in series with a 20-mH inductor, what is the impedance at 100gwr,u q:zly9. 0 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 sett i;+ rmhrf)k5w;cag 16bl 1pries with a 20-mH inductor, what is the phase angle at 1000 wg)r6mfbct1ka+1lr i ;pt; 5hHz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and zll1-6 2zk9:ocympbetm*9w oa n z5) d1.0-mF capacitor fo*cdo)on16zpwm 2:-y9mlzz e9ta b 5kl r a total impedance 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.a p:*svq jq4n in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000qqvs *: an.j4p 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 ivd,b ;)jtqv ml ax nk8za4;p12n series with a 450-mH inductor at 5000 Hz for a total im;v q n2a4l p1j dav)8bxt,m;zkpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with(i uj1zqnb g:/ a 100-kW resistor at 1.0-MHz for a total impedance of 150:zg1bqi jn u/( 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. Whj-q;dty u ;s:pb(rc9oat is the impedance at 1000 Hz?qjpr( ytc;9-sd b:; ou

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed7y 6y,+u t qdks2nkm25rcvz.a in series with a 10-mF capacitor at 1.0 kHz for a tota5.v7y sk+ry2a t6 k2nz dq,umcl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a ph86*duiw u.cv:zch9j*l, k iuu ase angl c dlvj 9cu*uk6iiw *u8hz:u,.e 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 wito*qcd*7 mk p4oh a 30-W resistor at 1.0 kHz for a total impedance of 45 W7 kpqoc4**od m?

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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 i7hogs *)bom:m n series with a 100-mF capacitor at 120 Hz. What is the phase ah)go* s7 mbm:ongle?

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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 res+q)iq0n-vlg s 7h6ngxistor, 20-mH coil, and 1.0-mF cnxl+n0vsq q -i6 g7gh)apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacew*cv z9+irauer-gxt.4f6 g8itor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current94gf xav6 8teui rrw*ecg+- z. 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 capa3,71d nkuwny 5n;np nvcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.nn nnnywd57 v31u, kp; 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 circuit contaiizv+n hv8rbnx 41gkb+v(j -c/ning a 50-W resistor, a 10-mF capacitor, and a zvgk+ b8 4ijnxv1/+ h cvnb-r(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 series with a 500-Wwhlrz;:lu5( qpr g )ebu* .o3n resistor for a phase angle ofg5.)(orulpz;r3 q *ub: hnwel $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. ( t2suztj0*o5izl* au At what frequency should the circuiuz0*uz* ao(tjl5 i s2tt 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 1sj;eod3a.3 d3 :oif eigb9k -b2.0 W resistance, 15.0 W inductive red.;3if:akb3s ie og3bjdo-9e actance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuilhgr/3a b9 y +awvh-1fx3s nf9t 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 3w7odj z5j0 f(,hn (nhi0 W. What is t h,jzi7 n 05j(wfnd(hohe power 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 resistor, a to t2 l,n38mzvjg.iw3 10-mF capacitor, and a 0.45-H inm nvjl,t33og8w.ti z2ductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF cjv70pw-):8ryi/7poo2 ds n5y fr;+jfvt wyraapacitor and a 15-mH coil in series?fw+joirpyvy j 2stp )-n0y a or7v;d78:5 fw/r

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needeh m8bi/91 frbmd in series with a 4.7-mF capacitor for a resonant frequench/1 bf b9rm8imy 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 needed in series with a 3.7-mH inducto 13+dqcwmmy e,u19kmy r for a resonant frequenc1mwmc 3u yqmey9 k,1+dy of 1000 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 pl3ldxkeo1 gp(pw7 kw nb8+ 4,t/o o,opnaced in series with a 30-W resistor and a 40-mH coil if the reso7owpe4d/+ ox ,og1n w tp8pokb3,lk(n nant frequency of the circuit is to be 1000 Hz?

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