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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 un,/qz4 gyy lixa4vj:y h yd32:nits 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 induc-qd x8y/l jh+j ibpvj9; ;ew:ation 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 produces what kind of c b ctlh)3i 9grqjkn6(u)93vdp-ovf a4hange on the in9pvukir)a-cq n 4v)9d(l6f 33 hojbtg duced $emf$, 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 aosx8dcsot1dpe:9 k9 7 loop of wire produces what kind of o8s xd1koe dp:tsc99 7change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the fxobll/9;olu5gl (g4fue y :2 m9;iljinduced4u/j e ; gm y5l(oilul;2 9xlblfof:g9 $emf$, 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*vg-83;8 iz p m.xq hj kbxqr6zmcr(;k 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 ldaao6bi+ )8n xp 4xm-hg(4 wxtaw, the direction of an induced current in a conductor will be 6axx4bm(o8wnt)gih +d 4ap - xthat which tends to produce 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 on a horizone e1nip79 sa1+b5xy3z+ xobswss;3s vtal table. A bar magnet is held above its center with its north pole pointing down. The stationarss7 s vb5z1 p;+e ssxeiny9wa+33xbo1y 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 table. A bar;n mn iq768kepm. +cvl magnet is held above its center with itsn;7qe+c6pi 8 mkvl.mn 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 regionzp7o v4wl -.pa where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from v47wzp pa o.l-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 ;oh,5mkxzxx lr 8e8 uyukb8. 25k4jwd6dqh/d vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induc8.6o xyehw j5 rk;dx 52,khk/8ud dmzulxq 84bed 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 horizz d9f3u00s ltbontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fromlt030uzf9sd b 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 0bmzwjms,ww +e6 b8k l1yzd(2horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eitw2k mz0w+ezds ,l b(ym8b16w jher 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 w ira srjuzhll2(5;64uith the north pole entering first. As the north pole enters the 6r5su jz2;4rai(ul lhwire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed.bn.zvisx -rzv;c 69 q 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'bc6n riq-zs v9zx;v..s axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an aji 1d44i:uvdr s1)/oq5g 5ohwn,jfu vxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orieod5no/wjj5 siug 4:4)duhvi, f1vq 1rntation 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.i xmr uqcg2*0(
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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 tha7wxlp6 c:+tdnlr* d a*p /dt;mt an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. ,al*e,v9d og23yib: qo ly*id 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 moved northward at ,9jriw n rbdo2w5)k ;6evgez:constant velocity througrivewgr,9jdn 5z) ew6b : 2;okh a magnetic field that points straight down. Make 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 at a constant angular velocisvlgo b/vz4/yrn/ +h6 ty $\omega$ 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 transformeb8ysnb.dv77 s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatz-gy h .6-ej5xhteb2 mes through 60 revolutions each second. The frequency of thxghyj-h5 m62e t.-zbee $emf$ 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 j4 k xy(i7wg iu2k75nxto

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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 device t xk,/glk3v9rlcrit56 hat

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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 ;o, kc (+04aj rvjsxwdloops than the primary coil 4,o j kr0xcaj;(d+svw then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the 1gmanq2b ,: zuzr/ xu;secondary coil br:z1u2xg zuaq; ,nm/ then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the ppzc..dii4wd 6ower 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 circuv)y+mk d4,fpqpic (p6fp1 +ve 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 are c :kweq2 ou(6n vx0qw/nonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vov 0xwe/2:q( on6 wqkunltage 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 1kl z4c86)oozgx9sn n series to an ideal battery of constant loczno6s 81g ) xz4n9kterminal voltage. 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 cux-rb-k b(hn- -two y-onnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conw8upu c2xe2mnt b90 *5k;rwby6m, eyf/: zmlwnected 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 ar4jcd /k6g,evae connected in series to a battery. The time constant for the circuit represents the j4a / kg,cved6time 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 6t /ootc l:q(vbattery. The battery is suddenly removed from the circuit. The time constant for of the circuit rep6to o(:/ clqtvresents 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 c (m9fgl7 )kf1r5at qqhave the same 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 suppe8k*nj 4qz ft06o9aynly. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. I fyicx30loah e67) l0vn this circuit, the curren lalx0o 0i)6y3hvfec7t

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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 z7 mk3/.l8 i44 qp h-sd dgjfz*ounyy8ac circuit changes by what factor when the frequency is tripled?hn zflzy 4 3s8i.qmguo j8*k7 dd/4yp-

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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 vo.,aih/w c9u-7cc :hzccny 8sq ltage across an inductor is doubled, the inductive reactance of thanhc9wh7u z,s a/y-:. iccc8cq t 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 k )l.cgjgx *.fapproaches zero, the inductive reactancjglc* )g fxk..e 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 circuit, the currvq gspads ,dcz2) 37)jent,3cd) 2)vd saps7gqzj

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes byy d.obx;5 fim; what factor when the frequency is tripymfd.;o ; bix5led?

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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 acr vjwsu2or:9ov i21-* gtpc(ah oss a capacitor approaches zero, the capacitowrpi*o : 2gs92h u-vt1jcav(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 voltages of the inductorg1yp1.i*z kk mq: ;vdg and capacitor in a RLzv.y1k1 *;g kq:m ipdgC series circuit?

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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 RL nw o5txbb0)iq0-ng:vC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impk/3khr7bxuf umq(2:mkq x4sg,q80 dtedance of the circuit increases if R increases. When is this statemm rx x280:qqht( 4sd/gqu,umk7k 3fbkent 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 impedanm4m (zi * hqv1iu0o p1i*j7+loq*mv puce 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 impedance of the c2gx.v lz h:lx* p2g ts4xg-w5dircuit 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 ser7o o0m *bydot2 cbx/t6ies circuit, the x*b7 b/0o dcot6 tmoy2resonant 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 drik07kv:ab/+lojx; u f kven 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 1s5jyxhr5 5uvcircuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uno;8u:2an2wtn+b l odq cx1 -hxiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop acd n2an tbw+ xu;lh:1 o-q2x8ond 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 0.20h8o) 3qa7 ep;om2sw to T. Find the magnetic flux through the loop when the plane of th oe2pshw8 7t;q moa)3oe 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) ( vt8v,(2epsv x5rqwl sn0pi magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar5()qp l0vsvwi,pxen8v 2r (ste 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 adjustable single loop is reduced fromfs c*4y+s v)ee $1.0 \; m^{2}$ 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 fti: 2*fmg yki6:c :g2qsjbd1o rom $4.0 \times 10^{-5} \; Wb$ 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 200pebeivo- , .pr4hp;rhuwb:* ; turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fip*-p;rb;4ib ,hrv p:e h woeu.eld 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 m tf qj:(f3ug/x c8md4an 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 are1v9p sn8og5ada $0.20 \; m^{2}$ 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 hok qdx m,w8hd18bp ue;(rizontally at a location where the downward component of the Earth's magnetic ,uw;q k8x(e 8pdhbd m1field 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 angular vecu +5m-ar0ljp4elpo7locity of 2.0 rad/s about a vertical axis through one of its ends while in o m pa07+rpjull c4e-5a 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 ap+1l8- cmsd tl wye tsf5il(;8nd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area hh ;4yqogm w-d k0 b; eia4sn73j+6dci$0.090 \; m^{2}$ 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 itjr d3)unh()ud s 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 the axis of rotation, what jrdu)h)3d n(u 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 tnecvq8 p i*3z /2gfg+qurns 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 an output of 129* pziqwrt +ev.70 xth V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil t xzwq.9ret70h*i pv+ 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 genera/qzfeic2s,o7*b : pf ttor 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 of 6.00 W. Theo0-xag7sp0i k-da z9b 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 x qzf 30ytbgvze); :1oz;o)s ta resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speee3;ztqbg x 1v :0;fo)zyzo)st d 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 tyb2) z)kdv zl74c7b kbjs2k8vo a 24-V power supply. The operating cu vb72vycdk)skjzl2k7bb ) 48z rrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internalxnvyes 9t)x;4b 9ix7o resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speex x9 )nvy47ieso;t 9xbd. 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 to a 24-V power suprg; ;e6k-v rkow,qcf; 3w+zrt ply. The o r;coq+vrew ,t ;3kg-;w6kz frperating current 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 needqe;qu1rs/bqt9) ) jfu ed to reduce 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 c ciss* :gj)w(gauses 14 A to flow in the secondary. How many turns are in the secondary?gj ) s(gc:s*wi

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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 man0 vr7;uhj 1 ;x )be./badmczigy turns are necessary in a 110-V primary if the 24-V secondxiu;d. )g0 /m7vacjr;e bz1hbary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and adjt0p h)*3i9g uhs( xpru)px8 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the u 3pxi*p0hh8ujpdgs t x9 )r()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% glz,e 0xmcl ()efficiency, how many amps atcmlg()x,lz e0 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 0, kta(q+hu8h.hjg+rkor*p t 7500 V at 10.0 mA. The primjo kgrk *08ur+t+.ph(ath q ,hary coil operates 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 tu6hzw; c ib-v/brns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl /6 ibwc;z-hbvied 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 iu7 (8dzpsaop4knqz v2x*zjyq60 y o(, ts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presenp2yaq ,78ujp(6z ozv*s04xy kzodnq( t 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 10n ux4k,7otw 3o0 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at t3x,7ounwk ot4he secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has dyuqnvzkq8 1 94. os)v100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of t8s 1yz.d4)9qn ouvvq khe secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnkomwaioqsjp,l-h l pqv:( s: 1(l1d92s 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 be (neglecting frictional losses),q1j(qh 9lviwm1ko-l: odp2 s l: asp(

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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 kvp 0si5v(h-n of current at 120 V. The voltage is usually stepped uppsv0nih5 v(k - 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 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 u)x5f) bl* ox m 1su9.hc6gfhstsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pow69 l x.s *)1ch)fs mtgohub5xfer 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 o7m-2fc4qs u zstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W.7qz2-4o usm fc Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A g/kp )0l;gsqogg9 w0pwenerator 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 transfosw;)gp 0wokq9l/g0gp rmer 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 lva ipe y2oa2 e7 ewh.,:4tdsdtd,m9t. ong 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 transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lom,7e,es42tyi 9wh.otvt.ed:d pd2a ast 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 downiy7f +0bo2vd p a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V insby 0+p7 2vdfoitead 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 transmitted 9m u* ja.*nfsoon 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 exceed * .j afuno*sm90.010% 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 the coiht 9p/ydq+ odhv,patp0 7e5a tbd-r6q h 1e2)wl's magnet52h/a qavo 6 tptp, b- e1h9dhd0ydrw qe+t)p7ic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W rguu3ia eb5 2w.esistor and an 18-H inductor. What is this circuit's time co b geau325wiu.nstant?

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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 voltage is 12lzn5 tq .uh x4xee)2:o0 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 o1 o8r0w4gdvuc utlet. 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 resistanc1u p s4 bf-e+h:mdje. os+i6yse of the la.:1ouhi+b se+ef4sd m js 6-pymp?

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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 if9 ) bpj*quoap4olgar:6s2 /power supply. What is the peak current6g4or b i lpuq*o9f/aj):2sap through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conl2b8mcvwp-mnm njo : g/-cl0y1ksan6( :bd -inected to a 120-V ac power supply. What is the power dissipated in the resistoccy ngpi8s-vo b- 26ka1 ln:bd(:m/j- mwl0nmr?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iss49ys* 5fnx ip $I = 0.80 \sin (240 t)$. 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-W9es,p5hy u1 whjgi*2v resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W 9-7 g8-y zwjojw6upuy resistor 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 inducto9:w pu:z b+p5cept+y or 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 ocy2n *sz/ ohgrcpj v1v64. sv)f a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of vn;p+ ylk so8 7jjztli481zz8inductive 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 fow+(0 d9mjw:nd aaxm 5ir 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V*5oip4 ch7mmwuv 6(ia AC at a frequency of 20 kHz isih7m5 4viw c(upo6a*m applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcv6.rz2zc o41rgfmhk;v3 y2* tw . imibe?

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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 capac0/n lc6gqr*w /uo8po x:mf4lz itor 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 u /o+x.sd lisfe ar7w)4g18q rhave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reacttyd;h1qzei(w v(:.qv8gdz v 1 ance 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 ,pye+xi(uk t3m5 x :lnreactance of a 0.010-mF capacitor be 100 Wt5ix:+kl,n yx up 3e(m?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?6lue+68ncif q

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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 a00 aooxb1x4k4mg )hlm cv8j8dc series circuit with 12.0 W resistance, 15.0 W inductm1jbol)0 xdk 84vg8mx0 ah o4cive 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 1 qof7z4)j pc)x500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conp)cqj)4zxo7 f nected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W bsejg1s.7 d z4i8) jbyresistor, 20-mH coil, and 1.0-mF capacit j4djs 78)szgeib.b1y or are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-jplxzp ie2y7t/wp ea- /m72j3mH inductor, what is the impedance atx-2yaepjjzml 2p p /w73 i7te/ 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 -5:ksk9scofais connected in series with a 20-mH inductor, what is the phase anglesso5kk-:c 9 fa at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed ( lv 9e1 /olrd4(zh v*qsv)sduitt77ain a series circuit with a 20-mH coil and 1.0-mF capacit( /v*v dve 7)(dtai97h utr1llssz4 oqor for 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 followir l 0ug*np9 x 2e0(cdhzi(tpl1ng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impzi 01ndp0 ltg l29ucx((*her pedance 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 inductor at 5 b36dfmek4x fc133b6/amtvc f000 Hz for a total impedance of 40000acfbx4dm/6ftv6 1 e kf3mc3b3 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)bi f(cw /zn5z84doke-g3pdv k/ tt*f 1.0-MHz for a total icwn8(/d/i- kt5 e*fk4dg)zvp ft3z bompedance 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 serq7vwu4ldue0 v 4ih7tz s27/fries with a 20-mF capacitor. What is the impedv7zu4et /w sh 4fiq07u27rlvd ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitatsq7n oo6cg4 b3l1 v2or at 1.0 kHz for a total impedance of 3o ng6va q7ct2s4b1ol45 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 zl8e a o96rok;1.0 kHz for a phase 9rozlo ak ;68eangle 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 ld3bd7-xl,x din series with a 30-W resistor at 1.0 kHz for a total impedance of 45 7, dxbl3dl-dxW?

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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/6;edy r-hc 1)mxvofk,xzw 5j with a 100-mF capacitor at 120 Hz. What is the pha,okxxzd1e-;hw)c r/f65mjy vse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil xgn(k b9c;sv)ff 6sj*, and 1.0-mF capacito(s6b jc fk x*;gs)nvf9r 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 od 64c:on i8z)iv6j fxied+w610.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hzcoo8dif)4 6wj+6x ve z d:ini6 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 an i880 c:nin0. teflk mirnductor of inductive rir cn.0 t k8:ne8lm0ifeactance 30 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 f0k7 :qle w/ /0nxwdpkyl.td i5or a series RLC circuit containing a 50-W resistor, a 10-ki np.0 w k5/dl/:l7dte0wqyxmF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a 8aqk85 qy i58ovc -d jz7qmu j4p-fi*aphase angle of 5vuj fqa5i-y 7dipk8 oa -c8jq4qz*8m$40^{\circ}$ 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 = 20.0u4zf2i)j0axfkcu o4j vyfhs1 v m*+6( W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum if0f4u1ks6) +ojux2m* hvy c4jv(zfapower 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 wnn.idh:+kam ng,3f)am - o p7cith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V .c7no i3)+n,gk:nf-p ahamdmpower 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 circui/ o7aps 49ica/d06qp*ints va t 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 o 3 (+feth q;u )hcnnei9no1pc:f 30 W. What is the power factohfcn cn;t:9( +1 uo)eh3qpneir?

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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 resisnu8-;wm:nhla 0 (ckab tor, a 10-mF capacitor, and a 0.45-H inducto-bhnku8nwl(m:0aa;c r, 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 c1s+khx)juml ftb8 d/*+iq5noapacitor and a 15-mH coil in series?5/m s+othqn+ib*dj l f)8 ukx1

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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 seriest4(,iy oghfkih3, b4b with a 4.7-mF capacitor for a resonant frequency of 10g(,b34h ibyfokt,4ih 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 inductor 8nuba4 6do5:rhh x*f* jidoc.for a resonant frequec *foh d86xdn ao.jhbu :r45i*ncy 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 placed in series with a 30 p: :jquomfj1q; h4f/(pwg dfu q,*i1k-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1 (opfqp :u: fjd4, mq*1kwih/;qgfju1000 Hz?

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