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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 unk/0nrp 5lu ,f8oshj/yits 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 induction states that .6lfna soe9 ci-qu/4 vthe $emf$ 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 xcfhx4usb 2;sxq*h94a coil produces what kind of change on thexu;xh4 b sxf*9h24s cq induced $emf$, 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 throu447 pcw)kuy6yods20tzafy 8 egh a loop of wire produces what kind of change on th78ucd4)6skfywpy 4at2 zye 0 oe 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 chavq.fk2d o/clqtpr42i/a(2z ange on the induceda2a2v2d q4//flp (.roqcitk z $emf$, 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 fieldv a1+/3q2 lf)j gdfvfm an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conv;a as,q: nj 5zm)iz;cductor will be that which tends to produce which of the following effec5izjqczn ,vsaa);m; :ts?

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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 a+vu ,.mm e6y.eh,cnsflat on a horizontal table. A bar magnet is held above its u.,h.+ vma,ceme s6nycenter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar r av1d.9qjv e gcw.8c,magnet is held above its center with its north pole pointc.c9rwag1 8q,dj vve.ing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field x1o t3)tngkbn xx0,uyl/) ,a bnhz;5avector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current i, ln3xg)0 1ynaht),t a uxzk; n/bb5oxn 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 al9+ v0snn .kzz*.eym+j (bxgvector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ox. + +*knz lszjb0ae9vgn.ym (f the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thdqxk61 h0u6ac.qx6t ke magnetic field points straight down. The magnetic fie61aqxuk.06dqc kxt h6 ld 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 hodnseya*) *ws5az/i ) rrizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inssywai*a*n z 5)/r e)dduced 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 with the north pole +z+y:u t2cv qz7s8p ukentering first. As the north pole enters the wire, the induced current will be (as viewedzpuvq2+8: u yk s+c7tz 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 i(jtem8 2serk7s rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnet(tks jee782rmic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatei ;36w k*cvptoo2fg78h 5up) sxg+htcc)x v ;id at constant angular speed about an axis whose direction can be varied. In a regthcpt2)hgx)*oigvi 8c x3kvu so67w p+c;;5fion 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 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.01 c2x1 ibe8wn ehhpbc.-a wo+
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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 ac *5i w6scp3qln $emf$ 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. j 50(gnkame/a 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 ejf y o7b)rmsp8 yv r)5/olry11ast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodvy11rr8yjy )7 fmposlb5) /ro.

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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 rotaqi/jn 0m h0l5eveq4t+tes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trdnu t(6 *2yjcds*c8)v m7 x+gbs2jyksansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fre7x0j:i0 mm gurquency of the :gmi00m7xu r j$emf$ 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 udt(gr*( l/x*e x 8v4rav yam1msed 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 devi+ mv5+;uzat38g)x ;i nniwuui ce 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 l7 iyi*8/wa pw2j/xa3zul4c*rje v 2geoops than the primary coil l/7aejuyepi* ixv/w32g*jcr 4w az28then 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 secondary coiluve30(j rg: .tans6v.g(360: a rjuntlvv esl 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 m6ao8l5ug(y rwe0f4 rpower 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 circm45aaob qq3(oplp( k 7uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of const-umbtk e /2l(dp cxm92ant terminal voltage. At the moment contact is madck92ml u/tm(b ep dx2-e 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 to an ideal battery of cons* s nooop),x/mh9 7nrxc9oarh , g.dv,tant terminal voltage. At the moment contact is made with the battery, the voxdo, ,xroh* .,avs/)9ngromho n7cp9 ltage 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 ind 3z ybaxr( mlsze/9 qdl;q)g,e-h,k2xuctance 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 connected to an (y0d n:plh:a f$emf$. 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 +1h1ih6/hi6hjr efsx 49 jshzbattery. The time constant forxh6i h/h f41 s+91 6serhjhjzi the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b heuw kuqz/;wcc-k(j 2 q8g20mattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the 2j/gkeh2z-;c qu cmwu q08 w(ktime required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units ep n.is npta3.7xcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this cio10yuazxj- n (rcuit, 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 s,4tw+wenbo ;186/a i5nke9 ytmjf3f - ltin ethis circuit, the currenj9snbek+mi,wt1w4ftn; 3 56i/ 8e lt -yafenot

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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 changt2 zcbv m+-0-iw; pqhoes by what factor when the frequency is tripl - qhitv0m;2wpbzc o+-ed?

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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 voltatxu6dc x-2/a*g - pg1urfrt y+ge across an inductor is doubled, the inductive reactan x *txrrc+u2y/--du6tfgg1p ace of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the ccn).g q;.qhp-a z* xca+3bsuhb5mb; inductive reactance of thba.h3;-+5 cm;nux qs bcc)a.pgbq*hzat 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 sup n /q*gg. d:v7kkyq+vwply. In this circuit, the curre kwd7n ggvv/qy:*+qk. nt

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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 the frepqzm);miyqv f k0/1l; quenym zki flv/);;0 1qmqpcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zeroey)k() m9otn;xs.js x, the capacit(eks.)9t xjs);xmony 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 betweec cionlht1o95 st.)7irh u vvs-xk /4;n the voltages of the inductor and capacitor in a Rso-14s;5 ni)u.cvhki hx9r vt 7/cto lLC 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 cipf0/ 9tlvss0wnoz*7o -sd ko 3rcuit 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 impedance of the circuit increasesbg+1sop-wf4(o 4n 5 eyaoz;wp if R increases. Wheswf oeo 5(-ynp o1 bzg+p4w4;an is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ :3 f788/hwq0ksgu:erspzc b puit. 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 seria0 hr u(vv- ynn8mjv( :h6x1qf8hgi,oes circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seri0y qv0rp 99qqp51ly nar:fti3es circuit, the resonant frequency of that053tpyr pqia r:10n9 lqv9qfy circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vo9bir1 n-tpxv,ltage. 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 oc64 kbwm8r+kraruu3 k 8curs 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 r:x +cb w3vh*bsotating in a uniform magnetic field of 0.20 T. Find the magneti+bv:3x*bh scw c flux through 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 is rotating in a umbo 2j/5uhq+n.fu jl hw t8s/-niform magnetic field of 0.20 T. Find the magnetic fluxwu-hsqn2o .ft+ /m ljhub85/j through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mabl;/mvq k0h* wgnetic field of 0.20 T. Find the magnetic flux through the loop whe; qbm0vlk w*h/n 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 loopuzn /.ubcn; ,h is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch i)mpv86tnq.z4rlpbp :d 9u a.anges 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,,58*gqej pg6m4lba fl-ffg k 200 turns of wire on a square frame with sides 18 cm. A uniform mag- f 5lgfgel6g,k m4*a8f jp,qbnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and ae;nfs ygy5:v/q e- ;kbn 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 475a foy wd6; r,ttg7kwkdgz7area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where t9;bcmz9oc ua6 8ll 51tof :pne3vo d8whe downward component 6 nc38do51cpwevz ;omo9ul9 tablf8 :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 af*hd*a-x;w iq 5oxauj6 35t sjngular velocity of 2.0 rad/s sx5qa5a*f3dhi;wt *-ouj6 x jabout a vertical axis 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 cmc.gi:2g-drf0 pu w)has 50 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 wire of are,a*o qif3d1 rpa $0.090 \; m^{2}$ 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 re 3+xuoc-1w 4 sbmuxje)5q 64rrryl,d kndu-6dctangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage ocn61rr kx qs,ldbe3y6u-4dx4rod ) j5 uu+ wm-f 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 turnsdv.n fhejxl;v)c 11mz )xq51e 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 zcxpd8a5 d/pcb6/*p c with an output of 12 V maximum when rotatedp 5dxc ca/6*p zd/p8bc 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 w -x6j8jkx7kl7:.wb t i ;orcwlith 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 3d3g* gqqm7 8r1rc 8 8kgczhz+cfv8qb.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on 1(0rt 9o),3*rwoo* qybrv ahfe 20 V AC, and when *oab)y t,o(r 9o*fvwqrr h03 erunning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-2r0a)yi g4fq ux/b7oiV power supply. The operating current fx0a2i ui g7o)/ybrq4 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 internal resistance is pm*do)0dx: 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. ddmo0:* ipxs) 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 resi7x uv-+ v+dce(d3px ()nwzn npstance 6.0 W is connected to a 24-V power supply. The operad3ndnu e zx-wn() + cp+7(vxpvting 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 it +/ew yr;ppt1s needed 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 transformerzqb3xw0:/q5 kx wk+cen- mtt0 causes 14 A to flow in the secondary. How many0w:xkznewx 30q -m k+tbt/c5q 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 in a 110-Vso.i*x - s0pecgh8 6 uskigm3: primary if the 24-V secondary hag: 6koi*c8pushg-ess0im x3. s 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 rn)x0w *a-: 0e dmshbjof a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondh*ba s-rx:)dmj w0 n0eary 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% efi:;xy)mmdut42 i d+yoficiency, hmty i );ym2:4dudix+oow many amps at 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 transform2jhngx++b (qh:wtd 1htvi; h +er provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dojbh h1x:v+(g+thq h;ntwd2+ ies the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its priml3*;sw,okpr fary coil and 300 turns on its secondary coil. p*sk3 o;fr,wl If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnsrnd c.e*xx*v, on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?,*vc e*rn. xxd

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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 tue3mf 6jofnk tn2m* rq+. j+ru5rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the ou je uj to6*3+mnnqf.krm5r2f+tput 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 turns vl xq 4/7/ gwm0t:xck8j/zxo nand its secondary has 200 turns. If the input voltqw cojk://7nlv4x/ x08 gz xtmage 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.jjqur9.ew+ , zftk9h and its secondary has 200 turns. If the power input to the primary is 100 W, we can exuhqt.k e 99w+r f.,jjzpect 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 60 A of current at 120 V. T(7xs 8 yuouz5mhe 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 tuuo87zmx (5y usrns 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 voltag57 wosrtv uzy**5tej2e is usually stepped up to 4500 V by a transformersvut2wj5 *teo 7r 5zy* and transmitted through a power line 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 6ij jfs9*bjx 9 4f:gn-/3hp ewu0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line :j /i *u4fb g9ehnjsf-3 wpj9xof total 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 km long has a total resistance of 0.60 W. A genj,kiv - cx:ko6zkk v:)erator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stv)o:jzikxk, k vk6-:cepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km l(e )get3t2nj zong 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 thnej gez)3t2t(e 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 potni;.e f-.ca o8bg y /yczmd)g4m j-0pwer would be lost if the power were transmitted m/)-bn;8g o4.p tecz-iy ya.cgfm 0dj 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 generatorq u2m4ce;*du-r vf om8 is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is no2fq*eov4mud-m; 8 u crt 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 enez5 /*0hr+m hmbxza3lj rgy is stored in the coil's magnetic fiem+ hzh* j0x z/rml3ba5ld?

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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 re(si ep/20h hb o7+qxog ,3ewhwsistor and an 18-H inductor. What is this circuit's time ceqwpwe/o h03 sxho b2g,i+h7(onstant?

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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 ha::d2vd;d fywoc l;x;dl 5ixua o9* 5the 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. Wh1b . iysaa0 p*z;/lr qbi8rqg*at 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 int4 twwmq:a /m(htvtp h.b;41 yng 9mcj(o a 120-V AC outlet. What is the resistance of the lampmgnw q(4mh1bvj m;4w.c:t t(9tyh/pa ?

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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 qpw+i (vv8ycjv4a70 bpower supply. What is the peak current through the jy4bw(8aqv+v 7ipc0vresistor?

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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 c f*zvtm8wdad1n 0-aj.onnected to a 120-V ac power supply. What is the power dissipated in the resis18j zv 0fd.*-tadnaw mtor?

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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 5+7,ts,5nu-l zzov a +w erh/om0-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 resistorkt+ klvx.*a v+ 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 resistor iku1q3 8y9l f nu3m /mjufe6pz-s $I = 0.80 \sin (240 t)$. 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 inductor abk2mef, q,o u/t 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 reactv -8,ncfdluu9s6ttjb*/ dn ig )e a h7a;cd1)lance 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 a86g. wf;+npyji 5v xia 14.0-mH coil 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 forldpvjm4clddii .5, 87 157 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 1:eh0royw 2ki a 60-mH inductor when 120 V AC at a frequency of 20 kHz is appr y:ioh kwe012lied 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 smhl bi6mb1 xkyx,pz- kmd,p+fg j- y5*n1(dl -ource?

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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 capacitor at 10blo1 s)f; e ;2 c1ajar wuux+8vgap.3i 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 ayt/gu 7at4uex wc:rfe1flw cx143 7z :t 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 real q7.ol8b)rz6f-6d j 7gh fwscctance 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 o;;yiw xg+ +6g7mbim ehf a 0.010-mF capacitor be 100 W bg ;he+;6+m i7iwxgym?

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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 oz4mi4y 2. j4gu dtqs-1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.7fqnrvsk ,b3s,jk.t5 0 W resistance, 15.0 W inductive reactance, a7sk b .vr5tq,fnsjk3,nd 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 impedancet-5 han dlhcty.d;4(s at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected -snhha. ydt c5d;t4 (lin 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 15g rf0vqo;3p89gm;d2z6ol xc n00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in 9xo vz0 ;dn38rl6qfcog;m gp2 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-mH in d eb91jhzw fn0sgrgxq8 ;dooy675y-) ductor, what is the impeda0q5) dye-;nzyhr1879 b wxfdg6oo sjgnce 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. orcbi 0qg+3i a 20-mH inductor, what is the phase angle at 13 0.ri bco+giq000 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 )/fq8u(keiu9h+,n i(n qburt in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500uu8(+ /i(9ue ft,kh)riq nbqn Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series w /dsuq/w. .n28cziphrith a 100-W resistor and 15-mH coil to get a total impedance of 110 W at .c28.n z wsr//uqphid2000 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 induhnkt5f(h2:dg ctor at 5000 Hz for a total impdtfn :h2g(h5kedance 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 pvqkehd/wuhlp b8u 9o;)33umcd 7 -*w+cxd z 2hut in series with a 100-kW resistor at 1.0-MHz for a total impedhc- 9ubx38 2dhcz *e3d)uklv7w+ ;huwo p/mdqance 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 cjkdrwp8;: 3m9n4 k d+elmju.capacitor. What is the impedance at 1009wpndkm 48e+ju3 jkdcm; :. rl0 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 capacitor at 1.0 kHz for ao)rj2 mr9sir, total impedance of r,jrior 2)s9m 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 capacitorpor svopc4htn1- ke9s0 : o40h at 1.0 kHz for a phase rs: ehpc ht4-npk004v1o 9oos 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 in series fu8f x)2h5dvgwith a 30-W resistor at 1.0 kHz for a total impedance of 28dhv )fxf5 ug45 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 h;5xag16pgzassx51v ;fh r 3q series with a 100-mF capacitor at 120 Hz. What is the phase anglegs;5p5zfq saa1xg1 h6xv3; rh ?

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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 :)1rs bh7w *tie,rhfh5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedbtihs*1)w h7 f:rerh , 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 capacitor, andbzik8i*e ( 0k a5 eviqg-cxyb:/x5a(i a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in ak(gzb-5i *qv/c8ii0ik ee( y:5x bax 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 reactanchgpu1-ffp - l6e 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wh6pl -p-1f fguhat 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 resistor,ah hlrp4f45s*(n gis52klw 4(g lu6hk a 10-mF capacitor, and( u 6g4gs4an2 * lkkr4f ilhpw5h5(hsl 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 wirzi8ewp-y7ijbu be,* m8 : b-eth a 500-W resistor for a phase angle oez8ey: ij*, mr8ue7bb ip-b-wf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF.xm-+nf)jknx 11hhq r2 At what frequency should the circuit be driven in or)h rq2+knjm1x n-1xfhder 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 ses623g r c0.yx wbzd ihx-q,iy9ries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powersxxiy.- bz6c9dy0h3i2 , wqrg 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 circuit idq8u;7ukg c;gs $63^{\circ}$. 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 imfryf z54- (yz b78wdstpedance of 60 W and a resistance of 30 W. What is the power fac8br(z4fs 57d-tywy zftor?

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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 contai-/:c d.n il8q itwaaf7ning a 50-W resistor, a 10-mF capacitor, and a 0f./t7ni8wa :a- dilcq .45-H inductor, 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 capaciuapz -9/e0du btor and a 15-mH coil in series?ue dz0 a-p/ub9

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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 f .jasi-o:j,3by ducykol4 - v8or a resonant frequencvc,a.k-b-id8l y:jo3juy4 so y of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with sv0 )3t8sg qnp4l*hfoqyk6ak2:c4ek a 3.7-mH inductor for a resonant frequfc)hsps4etakk n 3 vqkl*:8 gq0yo4 62ency 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-W resistor an*stu8,j v4xwkhu; )xt d a 40-mH coil if the resonant;j8 k,w u4)s xtu*vhxt frequency of the circuit is to be 1000 Hz?

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