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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 m atx 6,5 bycu8s(/wl8cx wuoa7agnetic 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 induction stqax/q 1gtp.jn c77j-x ates 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 inp:6q2w npw1g j :ob0za a coil produces what kind of change on the ia6q j21n0 :gp:obpwzw nduced $emf$, 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 o*(m / xozxd1j*1oxhdfsvn*e: f the magnetic field through a loop of wire produces what kind of cho: fx (* zx/v* mxesnjdo1d*h1ange 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 inb*qh wctd+min3 en;2z j/x2/aduced d ie hxw3+b2/* /cjt nm2znqa;$emf$, 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 f 7segt/bgz48f ;f*rv. zu+zno rom 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 2t;zyktzl22x qmba1er q4.6u2;bynwinduced current in a conductor will be that which tends to produce which of the fol kya eq 2222z.zn46my;u1b;xbwrlqtt lowing 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 horiz7l wdfmh+: +utontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when v+l :f+7dthu mwiewed 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. qd t r:osp/qu /fjk*(2,l4eia 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 from *dfri, a o:sqql t4jke(2p /u/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 t /ap;aeapr. +t4ar g4top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currenar /g4et ar.;pa+p4att 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 :i ,a 5gygf+kwc,sd cw)ro 3 z+y,,udzthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the ay 3+w) z,yksdciz +o5: gfcu,,rgw,d 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 tamyvnq,ow5 3cq89e; hfble top in a region where the magnetic field points straight down. 8y3vq,f o h5 m;enq9cw The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an everzf)avp i/lp17-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abopp lf)a vi17/zve, 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 loopop m:x vh+ecmwdr17( 1 of wire with the north pole entering first. As the north pole enters the wire, the indm :wp+1xm1o(r devc7h uced 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 rotatedcej )qcstj3 3+ at constant angular speed about an axis whose direction c)tc3 j sq3cje+an be varied. In a region where a uniform 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 j 01+kjhcfv.uhf, 8o znkof7/i.u ym;is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orienta.hyomou0fh7,ik +/ jf kf;n.vcu1 8 jztion 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., kp,s2(o:opvz es,ab
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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 anl0g tu8 wyskg,t.vps3-6m f58s- n jkv $emf$ 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 magneti;hmd /vef,tr1c x 6;sgc 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 directg.wxvg3ig2k.2j/xp b.btc e id 3s1)yion) is moved northward at constant velocity through a magnetic field that pic3 p. d.vejg xgkbgt 1)w.bsi3y22/xoints 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 vwdeyhkh7 *nff;6w - zoo- l8x*elocity $\omega$ 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 transforv7d--q asn0m ims

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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. p-/nqf 4we g)g The frequency of the 4ggnw) p/fq -e$emf$ 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 d7m v mifo88)vi frk,g:evice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device2why2b h)f z a 5ojiw*+3kl5xz that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primaryn 393( tqpv)l ucy/s2zxcu hzco95q a5 coil thencls9up5 z c(q3n/t 5 vchxy) u293azqo 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 theb.aq 4hr r24igb6whz( secondary coil tb hh(br2i.64 zwrg4 qahen 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 powesq* hd *-z lsfg,8kvdiq(3ce/ r 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 9 w ;izn7f(jbxcircuit,

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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 serie go/8 ga.,gm clvb*l6gs to an ideal battery of constant terminal voltage. lv /.gl8oa6g bmc,gg* 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 inductor are connected in series t n0z; zvmmtn5bpmf025 20 opboo an ideal battery of constant terminal voltage. Atzf5mtbzp0m vo05; b2o n2 0mpn 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 wl4 3qxt m; 90mhm0gaaaith 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 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 connectedgac , d :48duvtti7/hl 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. The time cons nbu(oi j:i .v1q;uopi 7im9x.tant for the circuit represents the time required for the current to o;.7un i: qo.j9v piibium (1xreach

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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 2l j-t. osryn uuz+v5;to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time vo2us yl.tnr5;u-j+z 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 fey +88gcf (/g4o mx.o.ium;am5cxkd have 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 xr d5 +mq tp3 p(- dn;wo74n woq1(;rdmn4sorrto an AC power 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 connecdpz :+ yxl:mcsdp.b,rcv1za ) tq23- cl a*6ubted to an AC power supply. In this circuit, the currenrmq -:us) lcpb,6al v 1czt.dd 3czx:yab*+2p 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 cv u:n)saqa7(r4ru4 8h ht*jaxircuit changes by what factor when the frequency is tripleav8qn7r xh(u ura )4js4* h:tad?

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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 inductivej bm1 5tlzh4psil8h// d,qb;d rldmb bisq;/l tdhp4 z1j85,h/eactance 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 pu axvn;9s.0ek- ptv/ an inductor approaches zero, the induc;et s-.x uvak90p/vnptive reactance 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 oe-isah;o*0 ,csykg 3 this circuit, the currehskso*g3; -oy i0,ac ent

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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 by what factor when +,10y8goxqx c,mx 1izjmd0tmthe frequency is dt0qc8, +my0 mzx mi,1xx1jogtripled?

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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 y45zynj .;sun voltage across a capacitor approaches zero, the capaci ysuj5 n;yn4z.tive 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 inductow-azs 7iu /u3g5*us yihs -tzo(vvhbm 9(c70or and capacitor in a RLC series circuiviuuu93zssm--vo70*tyg7(wi ozhh a/5(sbc t?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as l; z,f)ro-o hfxh( 4lh$\cos M = R/Z$, 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 impyeof xulz,4+d71 f0rp ui01 toedance of the circuit increases if R increases. When is this stae10p 74,fizxo fo 0lduuy+tr1tement 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 circuitc22gl ts.zntxugg8. /. The impedance 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 imsc 8qxrlpff+ q 8.*lb(pedance 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 j,hf: kidg7c1 double in an LRC series circuit, the resonant freqkjdc,g1 i 7:hfuency 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 i-yk:gvwr. hbn9l, yk++ i qwn*s driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occ /wg1s3nv6w7c/bbp maurs 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 1gympm lh/,a2xo:3r emagnetic field of 0.20 T. Find the magnetic flux throughxhg/role, m:py m1a23 the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m (oehuzfg;i3g u .g; )s .s2oplis rotating 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 fie i3 lu(og.);;u ozghs ge.2pfsld 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 0.2 k5 m6n)7l:)jnrziih t0 T. Find the magnetic flux through the loop when the plane of k lnnii7 mrj65)tz )h: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 f0fd ):bcz5bql/8 upr d rm:tx-rom $1.0 \; m^{2}$ 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 coobkum:) )i84dcdvr9f8+ek-qt i n 6ofil changes 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 fimp2x9x:8stt5l fe1xf k5 u1v rame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unf2x5 i9vxuf: pl18kmsxt1t 5eiformly 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 1u9k pu:xs:j)x 5 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 anrmw)pgwmp(xm4 2eh./d 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 wiiyy1akxd r16jsg5bs0m ,z8e :ng span of 60 m flies horizontally at a location where the downward component of the Earth's dg, mbr esx801:yay1ikj5sz6 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 ba2tj9,t ymv c.zr that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis . v2 cym,z9jttthrough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiopw c833nc 5lwonal 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 ofdcv8 7kr .g5uo 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. 4frtgi dge472);l9w vjozs6 n 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 ofde247vg 6js ni gw49;zr)l otf 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire pgj0i, in* a;cv3w6eqm cv.d0of 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 n6g5: bmuqtf 2f2nks4 a simple AC generator with an output of 12 V maximum when rot:5ubktm2ff sqg4n 2 6nated 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 generator withhf.7o,mpfqhz;72 x cel4s ,n, jjekp+ 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 moto77um qvof leg)e(;m9mr 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 resistancew d)9 k/3qu bbtnz+p7p of 6.00 W. The motor operates on 120 V AC, and when running at t9qz37pkbn bwud) +p/ full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp6xi:o5 hm4;qq58xj d z 3ghhsaly. The operating current is 1.0 A. What is the start-up cuhih8q45d:oxq hmz;as3jxg56 rrent?

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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 to a 24-V power supply. Txworgz ( +ab(4 :fts(yhe operating current i (sf(xgz:arto4y (bw +s 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 to a 24-V power supply.v;d0 9 zskcj)v The operating currek0vjz)c 9;d vsnt 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 s,;z4ajpm78y b qpo0pprimary 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 tt/k2c7vs0 x hwransformer causes 14 A to flow in the secondary. How manyv/x kth2s0cw 7 turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary inal*( ap: yfavy 2kdt)et ci81) a 110-V primary if the 24-V se)ev8 a yp1a(:kic * 2t)aydtflcondary 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 consistsib xgt2c1cub3k ;, 1rc of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is thert 2;xg3bcic1ku cb, 1 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%.hg0jj .eesj7 efficiency, how many amps at 24 V can flow in the sehje.j.7s g0 jecondary?

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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 tr d.dien(v zh1b/-m bzy-rdb9 0ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary/-.rzby zde d1d-bvhn0b m9 i( 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 hasqth5,j8 ajq96jq clp3; +qeig 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thet j 5i+ga3qhe ,j96 8qljcqq;p 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 on2 vmaqsj:p5nia sm6kye +sf 1(ll.)f, its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary.qni (fs 2yvl) m m:laf6,a1esjp+ks5?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu8p6a* byi9 4kosghpgcsrt )0 1rns. If the input current at the primary is 100 A, we can expect the output currentg r1 tpsy89*sc 4)ia hkb6go0p 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 turns and its secondarydfw,3 37ij zaynp +l 5b*jx8lm has 200 turns. If the input voltage to the primary is 100 V, we can exwfji58ymx7 *d3,aln 3zlpb +jpect 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 ancq m6zhx x0;yxj2f86 c8l j1mnd its secondary has 200 turns. If them;cc hjfxy nx608zm 2jqlx618 power input to the primary is 100 W, we can expect the power 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 60ti9y ,;-hcv mk)4j uxw 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 primartwc; yxji4),-huv 9kmy 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 1l1, :xt kret:h-u9rq b20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line1t9x:-hqb, keu :lrrt 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. The voltage is usually stepo b +9+tsp/-;w8 gttlen:jtdoped 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 iw/ t g bsnl; +o9e-t8:po+tdjtf 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 :gw. 1bwnt7v 6+kedel km 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 transformer with a turn7:gwn dwv1k.bt+e le6 s 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 loog/ jo6j, g:xn.6d 35fhbrv qyng 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 transfg:fgv5 hyn.3x jrobq, d6/ o6jormer 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 1c.76g.er bne e000 V. How much less power would be lost i.n. 6ebr ee7cgf the power 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 generator is 440 V at 20 A. It is to be transmittel rigk3:) fh1id 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 exceeg:)i1rhkil f 3d 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 storem a4y1+9m1 wfox gctw:t,d;w/g t jn,od in the coil's man:t;4 tjxo,+wd1t mgww c /ag91 mfo,ygnetic 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 andj ei8/ksuq9e1 an 18-H inductor. What is this circuit's time conse /91iuksq8jetant?

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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 voltages 0 ur us/u4-irni4r6ajb ixx-*)dx6t 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 outleyvjt h1 1m,z.mjr/n5dt. 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 -w(d,g sjil *e ox5d2n120-V AC outlet. What is the resistance of the lamn xj d,52we*sgli (-odp?

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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 supkpkz 2,-el78+b kahgu,.l o wpply. What is the peak current through the rp8 2h7ku+lbzwkl.a p,,ogk-eesistor?

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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 dissngqjidge6v0 q ow, )6 st9z9i2ipated in 9egn)dt g6 w92q,iqvi6o s0z jthe 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 czkrb f1 9xhjgf4e5(4 a 50-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 resistorw*zg:e 08 tl i3c-b(bi kytrz5y)7hyv 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-Wo1v27es hf8d wqx6d1u ,qi6rs 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 reactance5ydq8a syk4d- of a 1.0-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 2.50-mH coil at 1000 Hwvy *z 0ee xq+,tbj,g*z?

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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 reacihqg m ;t/27dftance?

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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 inducd1*ogm6kkr* sn 1 irb/tive 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-mr+;ys/xei st )H inductor when 120 V AC at a frequency of 20 kHz is a)xis; t/y+serpplied 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 q:0 j kghye4f/through a 2.50-mH coil 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 reactanpu(s1 sfksa g7r5ea48-c grn,lk u,sds+ ,fv6ce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reac xi56m ie+4eehtance 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 reactanceug-c:y 2vz vbui*ew (4 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 capacitiauk+e)y y6 iehc51f6p ael* ,ove reactance of a 0.010-mF capacitor be 100 W1ey*h cl a 6 yukf+ipa,oe56e)?

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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 atbhkqot1u zxu6.5 t8u+ 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 ol e4lrk(q7 z5 r9q;smmf an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive s;rkz lmleqr79q 45(mreactance?

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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,hd vd ua92)g7 i9jdoo) 4p0zqlgm 3)tz 20-mH coil, and 1.0-mF capacitor ar)dqz79)tzg ihdga l9u4opo mj02d3v)e 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 1500 Hz if a 100-W resistor, 20l 7; qgpc9gl** z-w)mq w)tuzh-mH coil, and 1.0-mF capacitor arez*) -zw7; lqlg*) umq9w hpctg 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 scb i;*r 480m r yye2isshb)hmhu+c9(heries with a 20-mH inductor, what is the impeds(bb*ii 2umh 84r) ;90r h+hmh ecysycance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in o(diqve* 6,*rldg jb1ue) o5gy,x sd:ductor, what is the phas:*1yddqox( jr,s) ilov5 geeb*6gu ,de angle 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 circuit with a 20-mH coil and 1.0-mfx9 ddn hu ,,ya49 .d33mqbwdwF capacitor for a total impedance of 100 W at 15hw,n.3,fam 9yd3q9 xb d4ud wd00 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 following3k vz*olq6jx fsdu. :9 capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impx3os9d* kqj.v6: u fzledance 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 u4bdw3 x -j/,: 4huos ixbvxg0in series with a 450-mH inductor at 5000 Hz for a total impedanceo g3b, xx-ux:wiub0sv4dj h/4 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 yae4)q09g w(u(b q djmttak0: a 100-kW resistor at 1.0-MHz for a total impedance of 150 (( :49admuttjaq 0kq)y w0bg ekW?

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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 capacitk0u z1 wi3t1 lj1fc.xxor. What is the impedw13.ukl1i cxx j0fz1tance 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 neee6o ku0 rzh5d/jbnea)4wb1zk, 0 f,.vbp t(gcded in series with a 10-mF capacitor at 1.0 kHz for a tota. r()cebpkd0gt1ezzh5,j,uwkn a 4 0bo 6/vbfl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-9yre,b 8 p7v0 fq xqm30az5pitmF capacitor at 1.0 kHz for a phase,q t3bqa0 5 ie x7pr0f9pym8vz angle 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 ing*4w2(1; o7 lr 7qjzv+om(mfch7dp xzkghcs- series with a 30-W resistor at 1.0 kHz for a total imped4c71omgzkx;*7-w r gvhq o lc2ds m(hf7p+zj(ance 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 p3qed,w+glhtkr+2 y4 series with a 100-mF capacitor at 120 Hz. What is the phady++r p k,g2htw3qle4se 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 rest in2/e;gjict 7)0tqmkr:4 xe)o v3qxistor, 20-mH coil, and 1.0-mF)qtrxott: cexkj; /v 3iqe)mi47ng02 capacitor 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 107p1 6a:urz p h oc4ah6-viic:m0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit i: 6- :1cm vihp46uha7o rapzics 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 reactj+-pwhsbibgi +97in my5k 2 v2ance 30 W, and an inductor of inductive reactance 30 W are connected in series topi kbnvs592m ibwj+7gy- 2ih + 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 containing a 50-W knd m/sizz 538/7xxx bresistor, a 10-mF capacitor, and a 0.45-H inductor, whe5/k m38xznxx z/7bsd in 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 nfy5,fo6cmv8von 4 k*d ecessary in series with a 500-W resistor for a phase angle of fk fn6mcvy5,*dvo84o$40^{\circ}$ 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 = qm;.tn+f -b)5y g ucrlf* mh0q20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should)-;c+m5ym lffu.qqg *t 0 hrnb the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac ser(8 akkkn6 5b/2 d.dv6ljvzn+fjjj d1ties circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is ktvn +6dadjnkjbzl.jv j6(2 1kdf/58 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 A*4ruxz. apjr 7C 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 r.h-ijp3wt-)ms f(zpW and a resistance of 30 W. What is the powers r-wij m.-t) pz(3hfp factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contai0x i)fjqphy . ob2vlpl.y -7s,ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductosl jv,f p-o)x7h y0iy.2pbl.qr, 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-r+m gxy0o3tq b.xw6qf.ia4 - gmH coil in series?xmyi+o gx-tag.4 .60q3fr wb q

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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 serixbo4f.3 b kwb6es with a 4.7-mF capacitor for a resonant frequency of wokx bf .643bb10 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 for a resona58vy0np/z9k6r1e uoo 6 lxa rmnt frequency of 1000v8o/x9ky r61a5 zuem po 0lrn6 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-W resistor and a 8ecd/2axe7m s40-mH coil if the resonant frequency of the circuit is to bmd8s/eea7x 2c e 1000 Hz?

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