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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 ard7 g p)ydu5a-ie units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductionw j a7xow e)u;xdb7.bx)*k8dm 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 ndkwidi j j1)2 (d/ogvhg*f6- of loops of wire in a coil produces what kind of change on the inducf /jwi6 g gj *dd2ovdk-n1(hi)ed $emf$, 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 aio i 7m 6ch3qwtgnlrz)u,c1k55w1r l7 loop of wire produces what kind of change on tw)c67u 5 oq1zmwrrl5g1li7h n k3,tiche induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop o-kb kjxm,5yw +cpqla;;5uwp3f wire produces what kind of change on the induced y-mkpxblc;qpakjw 5,5 3; uw+ $emf$, 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 f) 06sj bf6pjo 7+pykzbield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directi +ugbmh5t 1vb;b-lw /o.oozs4on of an induced current in a conductor will be that which tends to prod1; /bu 5.zs+ohv4ogtbl -ombwuce 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 onq8f ei1) 7kk o8dq)wybu,r dm5ga7fa5 a horizontal table. A bar magnet is held above its center w77)q q ffgm5),udaw8y1 e d5koak8ib rith 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 horizontal tablev7zlu 8 6 1:0miolkgmk. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed v8k zlimul:om1 67g0kfrom above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fien8(ivn4o/g8,t su yqd xxg mp j*+7;pgld vector points straight upn dpgj x*ysxg;t84g+/, 8n iqvmu p(7o. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field /. qn kg3;u;oryt5 2l a x)heu8s,lfbxvector points straight up. The magnetic field suddenly gr2lylfou,sk re q);/nx8. 3h5g;txabu ows 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 horizontal table tt3a0pb9gp i a6op in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewep6b93git p 0aad 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 g80ekpf/vxml ;l 9**ll4odhrtable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currerg/x9 l 0 8kd*;l4 lphol*evmfnt 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 norxz0yokk:qle6)ydnf() tr ,:u th pole entering first. As the north pole enters the wire, the induced current will be (as viewefn qelyok60):,r(u:td )zky xd 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 ischa3 x92qce3 r rotated at constant angular speed about an axis whose direction can be varied. In a region where a uni3a23e ch c9rqxform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular s8mx2rv z y+,kspeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straig2y+v, xsk zmr8ht 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 mq7,0r .jsjv7+vjjo
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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 that0m+-mn bpz.r:y mzr9 q 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 mdqojs+; *dy n7agnetic 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 syd r d3fg-,(mdirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the -3d (,rmygdfsrod.

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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 rotatnuljprai 0;vu1m32m8)bd0 xtes 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 t+ 4 qex p)/1vwjhn0vclransforms

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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 frequency of yvk( yjozf2- -thvoj 2y(zk-y- fe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tojcnl kae:9o.jg jy+: ;

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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 devp hu-: 69vnft msz p-kv(ne,-tice 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 n.g v 8m.tny7xqceo8kh iq851secondary coil contains more loops than the primary coil then it en yxqgh1.8vc8o qn78i5.tkm is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than0pizw n-c)-c q the secondary coil then it i in- 0cqp)c-zws 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 po;a7emi v1s98nyx h2;czfnl5 c )wdno-wer 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 circj wq)gnh/qkod,,lp 6 sls8+ q4uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battdvh1l+ 5nqk 3et5)vqpery of constant terminal voltage. At the moment contact nh)+5l5v3k vq1detqp is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series86 yc 0y/y w fnz1mhh*ma;1dwu to an ideal battery of constant terminal voltage.*1cn hw ymad8; 6fm1w/y0 zhyu At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an xfekj144avu6 $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected iepnyj kl*mj :+1gff67:e k3dto 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 connecte0u w/ k l-,fb;bw7hwxpa0f5pgd in series to a battery. The time constant for u,0x l7abpfbhw-0 kpwg;5f/wthe 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 connecte19,sxuzl:/ l rwj8xx wd in series to a battery. The battery is suddenly removed from the circuit. The time constant forlx1zrjs 8,u xww/x:9 l 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 sa6h6ffkq a 8pxy n)-/wfme units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this cx at/1n cydh .ia(5iw9ircuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit,. z iujl r9d1;y6ukldd7. mq(u the curren kj. 9y7rzqulddi; du 6lm(u1.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 factor whe 2hq.aoys c1/ml im+odlqv2; 5n the frequency is tripled?/dyaso +qhllo1cvm;.q i22 5m

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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 indu p:4-sgc9ovkbfg ck86ctor is doubled, the inductive reac og-c6bp s8gc9kkv4 f:tance 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 voltage across an inductor approaches zer7/4rin o,ypgro, the inductive reactan4/g7oyr,ipr nce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circu-c5y* avnf tk w l/ s,0txm)-ndu5x8reit, the currenlu dt)e,nvy fx-855 cn xt0/rkmsa -w*t

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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 cir f 3f23f9h/g vfzxvz1r- hmzkvx.g4 -jcuit changes by what factor when the frequenjh z2kv xhz gfm33f .v91zx-/g4-frfvcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approac0 hjj 2(5adfjches zero, the capacitive reactance of thjj(dhf5ac j2 0at capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor afug47 r l,rkkde s238znd capacitor in a RLC series circuitrul,2kkfz37 esd 4 g8r?

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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 pqdq6ro-yvy-6 ;;8f*a j nekaas $\cos M = R/Z$, 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. Tky9nocr64s84bbi ad4zw (o4rhe impedance of the circuit increases if R increases. When is this statement ybd8b4 r944k 6nzo( ioc4awrs 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 impedaky z5ofb lvg+t(mh601 nce 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. The h q76ktt+8t2rjzi 3qr 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 circwctop (lvm-o)2jo-t ) uit, the resonan-(2 pjcw)o to-t)l ovmt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied v vg vo9j(2+mtdoltage. 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 oc6 6yssc j(beu, 1-ujkowa2 fg-qk82 yucurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetiw 19dxal ar8 x)kw(3bp/ru4gec field of 0.20 T. Find the magnetic flux through the loop when the p )4dul(rp 8w9kxrxg/e 3a1b walane 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 radiusx4rxgal 4zd.4ukn+ yqen xgn0qv.3 2hh y)/g( 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thh344qna)n r. 4u2vgz(dk/x y. g0xngxyelq +he 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.co,i+v 1pfk cb(xth .+v4)h2+cp.yuhu/mvz l20 T. Find+l)yph v4vktom+vu(.hz,icuc. 1p cbfhx+2 / the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an t0 tfa j.r12v8hzokh1adjustable 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 fro 4ehp dtxhbz3q7;i+c9m $4.0 \times 10^{-5} \; Wb$ 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 200j oofa-q:tr;en7 /m -l turns of wire on a square frame with sides 18 cm. A uniform magnetic field-folj 7- ar;e/notq:m 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 wit-)g4obvg 8+ex .f cr fhvo2i3bh 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns kq4jzn s.qw2l+)o pz56/pfz yand 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 4 x/viapbgquolg3.1 1span of 60 m flies horizontally at a location where the downward component of the Earth's magne1 lxub3 a14vg. io/pgqtic 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 8u -anu9+ol,h kpb6g4g dq.se constant angular velocity of 2.0 rad/s about a vertical axis oqbk-. uuag6p8s+g49, nel hdthrough 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 s xuigcs+5:) -3r 7:f zbvelfrrjlo ,(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 euldvqqoq ghcr-k0q ( 2;77ice0,gn,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 rectangular9jhbzk1v u 8)c loops 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 of 0.30 T, which is perpendicular to thv 1bk)uh8z9cje 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 o0bxsm7f. 3vldag 98wb((ekb pa(kym- f 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 generator with n,wac : h*vc.oan output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area o *cn,ca: h.wvof 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 maxi w s1n08jg:+ni0pzfn0 +dg9mi qp ,xzfmum $emf$ 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 m4za(seo8q/ vaotor have 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 resistance of 6.00 W. ad ivbajid67qwt86 +1The motor operates on 120 V AC, and when running at full speed it generates a bad8w t6ai b6jdav1 i+7qck $emf$ 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 pf3k* q hr.vwc5ower supply. The operating current is 1.0 A. What is the starw k5fv c.hr3*qt-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 resist 1st n56t hm7pd.dv/ d6dhf4vnance 6.0 W is connected to a 24-V power supply. Thev/h1dfndn 5 s p 67vt4.6dtdmh operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 0 h14.r eaqs1eltw;fs to a 24-V power supply. The operating cu q.s t1fhe04sarel;1wrrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pr9-c seos8be5s imary 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-turaxqw9u) oyb ) j:s,e8sn primary of a transformer causes 14 A to flow in the secondary. How many turns are )a q s,e9u y8)wxobjs: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-Vcvar0 am6zt*. primary if the 24-V secondary hasr0 a .cav6tm*z 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 pria*hv,h3qv c* ccqt2n 9mary coil and a 2000-turn secondary coil. If3c,a*tn qc*v hv9 h2qc the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100%fcnbuwvqk-7e;: /l/rl e8 (w6 dqq kp7 efficiency, how many amps at 2lq7 /b7rq e 6wev:8dfkc/wpnk- q(;lu 4 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 siygig:t s of)l1; iv,rf 1v9-szgn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whatlvf9 ; 1oryf-s,i)ti 1g :vzsg 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 wta d0q*u33hi300 turns on its secondary coil. If 120 V at 2.0 A i*3widt03 au qhs applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300ll:j7k mse31 (re:, 5 2fm njghiujn7o turns on its secondary coil. If 120 V at 2.0 A is applied to the primaryj,5gei1e2m :rojuhs mn:k(3 njf7l 7l, 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 ti,y8h1o mlhc,y jq*6 its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondao *,l8tyh, jhqm1i6 cyry to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2x2snlxk*q;p b*3tx pdw 4g*v(00 turns. If the input voltage to the primary is 100 V, we can expect the ousn(vxwbdp;t4xp *l2 ** 3k gxqtput 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 transfon4uk e+82zhjn rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the 4nnhkez j2 u+8power output of the secondary 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 1d2kk /fcvz9urfe+y 6wx (78ev(musc60 A of current at 120 V. 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 secondary if the primary has 200 tu (y21kv8ds(c u fxrkw7mc zee6vuf9+/rns.

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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 usuallue(bu0 ) poep0dii26hj+ hgr t0by.6yy stepped up to 4500 V by a transformer and transmitted through a power linub6pg0+ydpyo jhu( r0 .)2etibi06 he e 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. T l-ngxk*jk *01nkmw e.he 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 stepped up0 gkn.j-k*xnw*k1 eml.

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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 genejmzqtn)(r te) o9a1lt 4s)yir,p:zk: rator 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 rt)zqzojs r )a kyltmrt:9p n4e:)(i,1 atio 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 resistan:.kq30xg , nra7hg9m kd;vg yi11nbgnce of 0.60 W. A generator produces 100 V at 70 A. In order to reducgxdmv:n; 0gnri9 7a 1qh3n.kg ,1ygk be 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 pb- xpo+3xit4 *vm 5-hjf5bngpower would be lost if the power were transmitted at 300 gxob 5xhp 5*b-+ijmtf43p nv-0 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 generj bo2mx :kblrsjrt:880e9rs4 ator is 440 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 not to 4:8xoj: 9e8rr0sr2jkbbmt ls 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 stored in wqb 81ip5 u+jw.u6w 3 qbfpl5- tbik5vkyj.8 ithe coil's magnetic 5-k.u5ikwbwy6ijtf 1ivuq8l38pq bwjp 5 . + bfield?

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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 lkkiyh,1bb0phh . w(m/1b)f 0o sfo ;dand an 18-H inductor. What is this cowbyhkd fpfo 1khh0mb/s.l0, b1i) ;(ircuit'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 voltage5enrhr lb ha(8; jeg03 in 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 into a 120kzvx s9r,h** :c7bt fu-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 into a 120-V AC o-ry0u. (a e)vixt1v6bibb/ le utlet. What is the resistance of the lamp?x- bi6aue(0yve t )1/l r.ibbv

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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 peazksscyfe-i*r0 ; tn+6k current through the resistor?ek; t s -+sci0fnzr*6y

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power d u+8 /iqkxkss7issisi s8k/qux 7+kpated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a nmp de+g +r9y 3w4nh;h50-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 resis3 4et4xl// qzijo muh +urp43rtor 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 resisrm3rjvj.aa;9 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 1e 7 ht79r/ve;l lbju,y.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.5puv 3u5r l7 0p(h9)p9-el d8d iaco iie2-zqua0-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+;w8i 8. xmug5yaa wbr 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 oft. :k+(u eaxji inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a;a;.r7is hefj frequency of 20 kHz is appliedi;s ; .fr7haje 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 coiyow/ (b 7vba5wl 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 reactcn pk7:cosx2j tv)n0 4ance 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 capacitiv egiwm84v4j2k,lkwl 2b 3 r5rpe reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a t0np j. 1ln,*an ;eexzr 4xlm310-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive req0bq:. kirvp55+q e1o g6s ebmactance of a 0.010-mF capacitor be 100 W?rog5mp0 .1ibev5 qqsb6e k+:q

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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 capteyd;f zr2 zep-dqy ( 5s,i2(4of:gys acitor 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 i-pklsh++xs -s nductiv-s-s p+ hlx+kse reactance, 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-mH coil, and ryy a *vnbi-k1kp .b0.1.0-mF capacitor are connected in se vbybk*.r1ay.0kp- niries?

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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 .wvpj-:*luj+w lxr6zq z)doohq,;/z at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con/ pr.ulv:ldzjh-+oj, z6 q*wo)x;zq w nected 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 vdr,rkj09tl9 with a 20-mH inductor, what is the impedanc0 9k9dvlrjt,r e 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-mr:-1 im6kjbjj pwc+)jH inductor, what is the phase angle at 1jkj+r )jw-pi6:jb1c m000 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 a y.ov5qhihlgd 2,9icp 6li6l+ 20-mH coil and 1.0-mF capacitor for a total ildhlcp5 +lyi 6v.hi,2gi9q o6mpedance 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 series with a 100-W rw**4n+9 .)jd 7eelcamdpzo oc 8djk-jesistor and 15-mH coil to get a total impedance of 11dend8ea j o*jc-j 9+pk*.omzd7l w4c)0 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 1g0d .vvxenl9with a 450-mH inductor at 5000 Hz for a total impedance ov e9g1nv0 xdl.f 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 a 100-kW resistor at 1.0-MHz for csj rct, 0y7/ oq vf8hq*m4p/)kisf7ta total impec4tois0q8 k,*t rhpf)7 y/c fmvs/jq7dance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series 5xe1r-do +fq:fehw7 7bfpgx 4 with a 20-mF capacitor. What is the impedanr + e4h71pgx f75e:xdfqwo -fbce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in serieglhhuq(p/f h.140e6z y vj 9bqs with a 10-mF capacitor at 1.0 kHz for a totaq l1p4g 0z9 .(hh/yvh6ejufq bl 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 withwu h8bw/dz0j xcd93fctf nhp:3* )k*d a 10-mF capacitor at 1.0 kHz for a phase angle :)d wthdhc38 d/9u *bfzc* f03jxwknpof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 vrf qx4 jx:qgh7gw. 1-we7fb4 kHz for a total impedance of 45 f 7qxe.gwx41v4h:fg w7q j- rbW?

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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 inrh-1q+ zm b0ze series with a 100-mF capacitor at 120 Hz. What is the phase ab rz-z+1heqm0 ngle?

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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+, 5hj85 y0 shnydvxxh and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cahx8d5 , +n05yh vhxsyjpacitor 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 osdh nm5n4roz4),k:g p f a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H d kg4op:,4hnz)s mr5 ninductor. The 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 b 1 s)zbky6i:jcapacitor of capacitive reactance 30 W, and an inductor of inductive reactance 3sy :6ibz)k 1bj0 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit conx:i2;zz9)av:ihmeq t78r vz 3nlwqx5 taining a 50-W resistor, a 10-mF capacitor, and a 0.45-H hz2r3x7lt)w mez:58iv;niq x9v : q zainductor, 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 qz 048up:ovmxm e25m gwith a 500-W resistor for a phase angle ofe u 0mg4m2:qm opxzv85 $40^{\circ}$ 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. o4 yaf*nb, x(m At what frequency should the circuit be driven in order to have maxiyf(4,* oa bmnxmum 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 12.0 W4h tvw8+maax 2 resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuitaat 4 vx+28whm 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 apq9fma)9 ilm 5n AC 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 impedance of 60 W agje,j)2i35 -cgmo),fu8d. 7ba i:bf onpxbzb nd a resistance of 30 W. What is the poo5) em 8bjgxf3 ibo:)bdic,u7,j n-pzg.bf2awer 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 circvx5+s8vj le9nuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducn l9vjs 8x5ev+tor, 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 capacitor and a 15-mH coil in series?l7vk v0erxpf n/*-ht;-6hfuj xj;6n f--7rptvu*0 /lvf ehhk

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacinfi7+ bk 3 p,p1euqo2etor for a resonant frequency of 117ob+ie p2,ep 3fnqk u0 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-mjy dcj2s66epb jkb) 3w9cr:(1i mfu4bH inductor for a resonant frequency jb:43ck dw 1e6 )ybbr6fp( i js2jucm9of 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 placed in series withs9 vv;osmu9n55a q++g yr .cbu a 30-W resistor and a 40-mH coil if the resonant frequency of the ci.y5 ;anbmquosv995 + scu+rgvrcuit is to be 1000 Hz?

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