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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux 9 pqre:p:):yg1e:ne julkzw + except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that gq,fy+ dxsa)/o,ytk 2 eb*qq+be3x2f 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 pro9j xega9n 3o);mqq i3mduces what kind of change on the nia m;g3ome q9 q)j9x3induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wir ovr/zr .85g.v+f lnnoe produces what kind of change on the g v5o rn. 8ofnlv/.zr+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 l9tyw6pfoez8 +id6 5bq7re97zvr8mh a loop of wire produces what kind of change on the inducrz6l9 op9885evtzyqrbh w7 di6fe+m7ed $emf$, 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 fry*q t36jmz;rzst/ xs:om 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 induce iijg2x8c, /e u+s pal-k:qsr-d current in a conductor will be that wukqe8+pai- :2/l -s j sigcxr,hich 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 horizontal table. A bar magnet is 1 l1f/8epi1 i9.gjwvqku j jz1held above its center with its north pole pointing down. The stationary magnet ief1j91julwj/pvi. k81 qgz1i nduces (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 horiglo6mi3hi -/1lnc21f we/ qpizontal table. A bar magnet is held above its center with iwiop nf hmi6qe/2l g/l1 -c3i1ts 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 totdlj: 9jw9hno o;0(qbre0 0m pp in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the seel0owd(j0p m tj 9rh:n9b0; qonse 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 jbpr;ena4 9h9 vector points straight up. The magnetj4r;a bh9n pe9ic field suddenly 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 horizontal ,e:js5ob lqs.table top in a region where the magnetic field .so:,b eq5sljpoints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and5 g.xdv--ql0s2)6lkdcwuwt bj z q 9l2 carries an ever-increasing current northward. Two coils of wire lie flat on the table, 9-g zbjc5 )q2-dlwx6dvlt wl uk02.q sone 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 thf.t+ri v( t)qja20hjerough a loop of wire with the north pole entering first. As the north pol0.e h2i( jf+tv)rqtja e enters the wire, 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 s5/ygw p*i8sfr 9m bs5b na/5cdpeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight a59bg/s w8ds yrpic/ n*b fm55down, 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 speu,c3 hedmne ; 0-vt9qked 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 axis of r-d9keqhe mu,tn3; 0vc otation 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. e87)12 ayt9v0 lfl7dcsgozry
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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 cb z+v5gt,uq*mgve3i:hs5;r s x1f/ xan $emf$ 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 magnetic69nd37yb,qm lv fc 9vsu*2bga 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 d5(+hgbov vr/e; td 3tthe east-west direction) is moved northward at constant velocity through a magnetic field thadthd53(;/ vtb+eo rvgt 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 l)lfsx4)n y1biblzh )z--nk4 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 transfogf+/ pbtrq-h1rms

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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 se)cm5,e3kssepz g 9z f)cond. The frequency of the em)z5e3gkf s,cp) zs9$emf$ 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 m(7m 5v/mq i6 iozyomm6gr;y ,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 device kigw5uw 6 2ah4;6u l,krd bq.vthat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifa f)3i 7 drwjlgj,.-re the secondary coil contains more loops than the primary coil then it j-j),ra 7.lred 3wifgis 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, ifl11.+ *zkbfy/rvlavr the primary coil contains more loops than the secondary coil th +k*vy lrf1/1lbrz av.en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power ifjf 4rv9(fys t8xg (sxe+j2*xnput

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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 circuiqs:z6 ps4 dlg+em8;mm .2dnklt,

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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 inductorfqj m1m7 v+z:9bn:c wkiz4.lp are connected in series to an ideal battery of constant termina7m+ 1: kml :fzciv4nq9 p.bzjwl voltage. At the moment contact 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 inmic u9+nt2v-5 azm+gjfwoy 4 6ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the +-jc6f 45 ngomyu9+ztiwvm2a 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 re,6/)f08elskjx:f b 1mzhzkpd y7jn/nsistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit witq1hv:c 56y a7aya:erv h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Th.x5sy ljm/y p gc.eg)-)scs d5e time constant for the circuit represents the time required for the current es c.ds s p5l)5g-.cy )/mxjygto 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 g1+ vf4y+ygwi;vz/ f1 q kia,cbattery is suddenly removed from the circuit. iiyyg,4fz g;+a1k+/q1c fwvv The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unit*dfs7a, )l3gx9 xbm qvs 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 pow qssoh1t ddk4cu glq-d*r(wj3+ -s4e +er supply. 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. In this circuit, the c dkiuj ba/50v:urrentb/jdiaku5:0 v

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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 wha2hs3ym br1 v0)d3jo yjt factor when the frequency is 31s2 ydrjh oyv0 )j3bmtripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indua /2toqb :qjt )+jz cnnee+;3tctive reactance of);ec/tt oqbe ajzntq3nj:+ + 2 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 acrmu ).-f ) lxdn+(txneposs an inductor approaches zero, the inductive reactance of that c+m.)ue )l nx(-tfdxnpoil

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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 toq42y6iryv rx e* / ,-oshnsh+v an AC power supply. In this circuit, the currentyrhs -h 6*e /x+y 4qvri2,vosn

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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 circuitlet:(w91xh j h changes by what factor when the frequency is triplee xlhw1tj(h 9:d?

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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 approaches zero, th wp,,y6:q:zcsjox vuf.gs q+,e capacitivz, :6qp gouj,sxqw+.s ,v: cyfe 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 induct 7uclwpxh8s -tk0s*j-wu 6dh(hez2.h or and capacitor in a Rdt xw-j8u 7uwe0sp -hzs*l(h2k. hc6hLC 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 RLC circuit is defi8 t 7g 6)h3wkwbtqm(jjned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance mbp th)z(vbmd((o)w9of the circuit increases if R increases. When is this statement truep)wbbtv 9(zo m) h(d(m?

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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 w/ yreq*7) uwnof 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 iizze(ip d3z0j+fh vwj51d: k7mpedance 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 y59)2mxtmp c/bs q8sd double in an LRC series circuit, the resonant frequency of that circuit will/2d m)yc bs8xt9 mpqs5

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. A6kgvju)ij /j*t 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 serie/icwgjl;gn* 5 s RLC circuit 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 rotatk vv 3-jmr t8blgu--1jing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are -r 3-8ljg m1vubv- tjkparallel.

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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 u, w t:rcl-cd+ q,e .bntvo5rm*jxs:y ;niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ol:+dnb t:,qrw t,xcoms; 5*v. ejcr-y f 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 ratvjagswtd( 2)7m w0 i4dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic fg0 mawv2dwt)(47 isjtlux 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 adjustable single loop is reduced fro8ut:7 y st3vq scndi:2m $1.0 \; m^{2}$ 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 cha6q*lshj:i sb7;x zkhis *mv8.nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frhyl/n:1jrxgv6. si w/c, s8eb ame with sides 18 cm. A uniform magnetic field is aphsel/8 i.y6s /1wnxvc ,:grbj plied 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 witf thw a6ek7)x r26ju9hh 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 and area dslv +cjhwr6l+;u7 e .$0.20 \; m^{2}$ 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 horizonta- 6jy2 *-xumiwxas)uk lly at a location where the downward compon jy6-m 2u-u s)ik*xwaxent 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 constant angular velocitriqa1vci9rhc(2 j 3p fdi8 8 bflwx)96y of 2.0 rad/s about a vertical axis al81jfrfi br 698c2w9)vdh3iqpix c( through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has c g(.0mkzxja 850 loops and 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 wi 0vh z d(kx2v7ipyga59re of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 1f z tnkd3oe-952 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 will be the maximum output voltagez5 9dnektof-3 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 ofxpopum 0js 5lbu84*/o 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 wishiqf5 ejx8n9(x11 )mny:b bzsv to construct a simple AC generator with an output of 12 V maximum when rotated yvb (qbe5m9zs8inxx1 )1nf:j at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a m3d3 ( it(sp ti6q ymw zth,38p dnd3+sw+n8lxgenerator 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 res z*dg j;,hzu0 vdcg ;p/gs .8hydtx+1iistance 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 rrdacsyl6r:;ze 6-w :hesistance of 6.00 W. The motor operates on 120 V AC, and sr6 :cyeal6d:hz w;- rwhen 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 resis 3;8ntucwmfi0 ix6h, g- s)ugxtance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current;gtu3)m,fs -x0u 6whig ic xn8?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected,2bx mm sgxm/j-nj)x 9 to a 24-V power supply. The operating curren j/,m 2m9gsb)m-j xxxnt 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 resistancek1oy qg6-h5zqi(w f38 ipl;s0wx8wfe 6.0 W is connected to a 24-V power supply. The opew180e36xlohpfz-gs kiwq q5i;(8 yfw rating 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 n8q +csx;5 bgsn:yvyb+ eeded 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 causes 14 A to uu t a hjbwd)/z34*bp4flow in the secondary. How many turns are in j/43u )hdub4tz a*wpb 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, ho3p qdqk768pfew many turns are necessary in a 110-V primary if the 24-V secondary has 100 tepq8k6dpqf 3 7urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn sec* zb7vwwth7r3 73wqfjpj0 rh.ondary coil. If the cuz7wp qwv 3hw*7jb7jrfh0 r 3.trrent 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%22gd,t*1 u/t fy k,nzcxc0yji efficiency, how many amps at 24 V can flow iz* , j2/g,ty yxk tc0dnfi1cu2n 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 10.0 mA.86tf;4n)dhc pa 2cwiy The primary coil operates on 120 V. What does the primarycd6 2acw hf)4tp8 in;y 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 pz0:pl2m on7j+y;ccxt rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the se 0onxzcmpy2+7t j;c l:condary?

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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:he4ziwlw --zj *j9p p primary coil and 300 turns on its secondwlejh 9z:* pwp z-i-j4ary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and ur( mv7eatdz1m0a 5 o1its secondary has 200 turns. If the input current at t5o7raa1z 0 v (umd1emthe primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turn8/d:b1imf2sl s/aiks s and its secondary has 200 turns. If dsism kl//i18ba:s2fthe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaryzxb51p */ck5fq echg. has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secc*5qgx cze/h5 b1 p.kfondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12vcwj/wdf+q / *0 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. d/wj*qvw /f c+ 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 curroplkxgt8yhz 36ki;rk 1*jrzp 3 :h3t2ent 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 pero31z lt*; 3xkhgkp2hrryjt kpz:i386 centage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualli,7et )d:hu ufrz,-xnv 64alme2og t-te ec,2y stepped up to 4500 V by a transformer and transmitted through a power line of totah , z2o-de tvi4,u lf7:nte)2gaxmre -u,ect6 l resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 k3ggwz))b )waa(,v3 hd k-ut jjm 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 transmission line, the voltage is stepped up with a transbwv3a djj,))g) k(3twaug- hzformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total +d.rmtjc9n)n cc)hr( 1 gvtr;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 thervtr c)c.+j)(d9hng mt 1;rc n 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 pow6austvr /f +-uer would be lost if the a +usuf/t-r 6vpower were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generat e;t*vc li12njor 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 witln c*tje;v 2i1h 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 stored in3 yugos0r 5u-b the coil's mag0s go- uur3y5bnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is th/ hpw1o9*/.cgrixi8sle j: , l y3kowcis circuit's time constais,jogxhop *9 r1k iy.lw c/we:l83/cnt?

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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 wh 7/v pcmb2g*:k.m omt+xsvk( pere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the n3 5tnx i:tapq lfp// qje,41speak 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 oflxotidg5ji -z489 u7ej+r v0m the lamp?l 8 +rm-7ji0do i59g4xtzevju

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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 :. sbma4kbypin, 2)ia+yz(yuy,pt(rjv+pe+ a 120-V ac power supply. What is the peak current throuyk+,ybtpy2)veaa:in s m( pu+zpyj4bi.+ ,(rgh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power diwvopn3z6/1 )tty1 ko);cn sylssipated inn3y)s 1 tzc vlyonwkt)o/ 6;1p 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 red/51un5 pir,6 lnkod f04jr50-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 aos 3fnjh8u yi4j6/zn,g5j 1nis $I = 0.80 \sin (240 t)$. 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 gb0gdip46 ht:6mybbs v- d90zresistor 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 1.0mg(l:zno swg+n;;g8tq(v k6rzpk 5 / s-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 react /;ucw y1ybt3qhet4 m j(twg 4z;tz 8vda*n(4kance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coiq--sb7pwe) f qorkiu9x,ar( :z )bpv 7l have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive h8c/3q gjbh5+cvbsoan -sn *: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 induckidsq/ tg r/y pys8w 2vc-(iaj397ap( tor when 120 V AC at a frequency of 20 kHz is applied to it?8v79idgs t (i3pyaar-c wy /jpqk2/ (s

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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 sour8(1r ak:lj5jev7zw hrce?

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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-mw lkn a,qd724cF 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 php+ -r.f +:a rmsauu5at 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 8yjr dq1m(m)me z o8*ohave 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 reactance of a 0.010-mF capt+ llp2ec8m1b/6ro: xywa; a dacitor be 100 W adl+21a :obxepl/w; mr6 8cyt?

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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 ajgze1(0(e ukqmo qf ,5 tsp;g:nd 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 cirbm 0wnw+aek ;s,66vvnjd, s+rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanc b0+ksw,jwmdvvn;,nre sa +66e?

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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 imp qh *e5ji5jyrq152qvcedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa5 *qj5 ciqjr 1yqeh2v5citor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at qu.hxi/ w(6vy1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap6h iqu.y (vxw/acitor 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 connecto9 dv/sj2 lmoei-+ 0gied in series with a 20-mH inductor, what is the impedance at 1 e/-imd0i+lvj 92os go000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, *0cfgp cu,*iuebu79 toc-; n4r c7 pewwhat is the phase i9c e,7f*c 0o ;cn7*up utw-e 4ugpbrcangle 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 in a series cp6ygzq,a 9p7mircuit with a 20-mH coil and 1.0-mF capac qyamp96g,p7zitor 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 following capacitances is needpkr9 rp2yb m (e3w(s*gs g0oz9ed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 Ws sgew*9p og3(by0z mr(29r pk 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 5000 Hz fxbhz9q*p )rqm0 3d:qhor a total impedanc qmhp9r 3:h*q) 0qbdzxe 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 a 100-kW resistor at 1.0-MHz for a t -jn7f3 us2)vw 3idmzeotal impedi3svf d)-u2mwz 7nje3 ance 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 with a 20-mF capacitv85kdek 3; :.jbxr eekor. What is the impedance at 1000 Hz?; dekv. 5kbe: 38rkxje

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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 capacitor at 1 -qh 2zge;(ed 5 kkqpc0tft3v;.0 kHz for a total impedance ovdfkp;;ke2he- tqc q5 3(z gt0f 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 capacito,r *vp-l:ykcsy1* feor at 1.0 kHz for a phase anc ekf*yr o*syp,1l: -vgle 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 with a 30-W resistor at 1.0 a0 1gt zj-q*d8s+lilikHz for a totalz s1qjll-tg*i ida0+8 impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capa uzf5-za 0u7dvl eq+4ycitor at 120 Hz. What is the phase anglv0u 5q4z-+f a7lduez ye?

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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-lz 8/vr/t.i ppqd of4:mH coil, and 1.0-mF capaci/.dlvop4z /qitf r8p :tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacit f80u eih0hji-or, and a 0.350-H indu 0uif0h jhi-8ector. 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 capacitor of capacitive reactanced 7 v)fal8ka3c 30 W, and an inductor of inductive reav ) c3lda7kf8actance 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 for a series eo/ zhs j3vg88RLC circuit containing a 50-W resistor, a 10 s8hvo3z8/jge -mF 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 a2d3pould)nr ( 500-W resistor for a phase angle ofdn2ru) d(o3p l $40^{\circ}$ 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 mF9eb2j592izen xly af z .qm+z1. At what frequency should the circuit be driven in order to have maximum power transferred from the driving .ef15z+qjmx2nyel i2 az9bz 9source?

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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 outputoja0 w68sru 7lo 3 exmrkvo-fun3 1.4e in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuitms43o r 18ue xe67jkw.v0 -lfouo3anr 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 c ir7nhdwy+fv wo*segmh/( k(koj 0-81ircuit 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 impakqkhkf py-c-5 pl 61+edance of 60 W and a resistance of 30 W. What is the power fact-y6pk +-ca1lkqpf5 hkor?

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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 gn6o:s9 jvzm 9tui7. saej2ua5v n2ktx0vr.6a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducto ijvax7me z2av.tjs2u0ks.:9o5t vu6 n 6grn9r, 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 ok/ - o4+j+zwhvhevykw yvs,4) f a 1.0-mF capacitor and a 15-mH coil in series?/ kh4y4vvokvs z+hw+jye- ,)w

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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 capacitor lt..sqysmi( 0 for a resonant frequency of 10 kHz i .0m(ystl.qs?

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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 wgqia-, aoq8w 0ith a 3.7-mH inductor for a resonant frequaa0o, 8qqg i-wency 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 y7yh0)q 2a,br48iwskfsv e ;l series with a 30-W resistor and a 40-mH coil if the resonant freque4s y8i2hk0,;wy rle afv )sbq7ncy of the circuit is to be 1000 Hz?

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