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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 uee0yrk5r-t,f s1mv0 d30t twwnits 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 t7eky bg2-b8 w2 yrl/by(v (dsbhe $emf$ 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 uft f0t,a.opni)tn m8 o5h20sloops of wire in a coil produces what kind of change on thfo0m h) af0ttt8ionp n,.u52se 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 through a loop.csyx)zax.5of 8*o m w of wire produces what kind xxo.cw) y 8o5sa.mzf*of change 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 offrug:pz /+.vh wire produces what kind of change on the induc /hfvz :prgu+.ed $emf$, 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 magnetcxz8 jkbn/ih;r5z 5t4;18xx x(tblbdic 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 induced current in a coni7bba 5fy) voht8nep i.e, ;(qductor will be that which tends to produce which of the following effecif(7 n8vei b qbaho.pte),;y 5ts?

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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 horizontalz4mp/b as p*k vrf):(v table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when(ka vmpbs/ v)zf4:r p* 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 horpia*de g6w- 7; dkdee0efue27izontal table. A bar magnet is held above its center with its north pole pointing down, and released. As 7 i eg e-pewd a26;dfuke*d07eit 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 0idejn1 *jtcp6 l*g r2in 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 current in this coil as the fieldeljp 602r* c tijg*d1n 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 z:ti/7q :u 4uzhfam,gthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increase:,zf 4uz /agiuqmh:t7 s?

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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 horizontalwf -k3c,qbzkm);/x mf k((jba table top in a region where the magnetic field points straight down. The magnetic field disappefmb,()qk fwbz3 (-/j mk;xakcars 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 horizpmab:(x ;xgp(2ps;nm ontal 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 indsb( g:pxmp;x pm2a;(nuced 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 entering first. b7dbvf f)w y81As the north pol8bby) dv1 fwf7e 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 rotateljn.m8xfm6g .2g r9g7 u onju4d 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 orientation of the loop's axis of rotation if the induced gunu47jol.xgrf2m 9n8. 6mgj $emf$ 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 s n/b: wmt)mxw8peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or8)w b: x/mtwmnientation 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.06g,acgyt2w*h mp c/ x
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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 thsh s.: ywi2(l,b pdiu8(/lhcrat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magn36sc x6xu3 csretic 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 inir t(cgf 2np6n: a(lbdq9m-5e the east-west direction) is moved northward at constant velocity through a madl2qbrgcf 9(-i5a: t(6n pmnegnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotatt a k4d2r/3grnes 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 tr/ av7xy jl.m:ho0tx8 fansforms

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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 r7rnygar9s, c) evolutions each second. The frequency of th9rgy c ,)a7rsne $emf$ 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 dedbv-, onch) r hn4+x-upm8xf .vice 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 dguhj232kag) 0 puoy3o evice 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 coi- z20bi f7czr/aw3md1nh .w kvl contains more loops than the primary coil th/wn1w i-c3 dzbk fa.2z70hm rven 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 contx,ka ;uogc 5i)myy :w9vwc39. nl/ympains more loops than the secondary coil then i5c.m gcv/ myaowk,ylywnp u9x9;:3)i t 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 io lp3.t,amwuwj8g h07x 8j m.unput

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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 circui ju+tf u)vu4c ao3lc1+t,

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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 indbght xdcr:.++uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the:+h g x.c+rtbd 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 c;*t /3 cc az+ed(ppjrt:r.xj s fjv0g5onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor (zj 0 /5 p*tcr+pasjdx.fj;3g:trc ev 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 indkclw2 e9zq+ 4uuctance 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 connec)qz p13u(o z 1n5ntzco/iuy,kted 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 conne5vta w)o;0qit g9gt.pcted in series to a battery. The time constant for the circuit represents the time required for the currepg0tgt5q 9io; wv) a.tnt 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 m4. d2iigw,ssq 5vg s5in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represe2g5 wiids4,5gq mv. ssnts 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 se 1aaag+qzoqa,y6g:/ame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supmo,mr( wg c;29qt9e vrply. 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 3 h7tmm4qs rb-supply. In this circuit, the currenhrtb7 sm4-3mq 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 a/( ktxo-h7m0 ahk3ojuc circuit changes by what factor when the frequency is tr/kjohk uoxt a7(- h3m0ipled?

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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 inductiv.mhfq-,g7zb37/ h oum ;p/biwbn, od ae rea7/ b mdqobwi7 mga h -of3znhp,;b./u,ctance 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 th1d row:wz-r62 (oilv7 zw6vche AC voltage across an inductor approaches zero, the inducrzod6r7w c: 21vw (ohi6z lv-wtive 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 conek9 );ee akliw/di, oh*2qee8nected to an AC power supply. In this circuit, the curre iikeee e/* h; ,)oawl2qek98dnt

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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 cjbp39a3 hw p 8u8)thuthe frequency h a3u u98hwcp3t8pb j)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 zerz- j+uxjvdz1c+ 8-p nao, the capacitive reactan ucj zp vd1--jzxn++a8ce 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 at8;6nxor2nju m88bgd g+3 ydthe voltages of the inductor and capacitor in a RLC series cirao28d+j8 63guy; nrxb mn 8dgtcuit?

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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 i/t ifwwr*h m 0jz9a +dw2ugzjc p102:cs 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 increases if R incre8if8e 04mx wfwases. When is this staxew0f f4iw8m8tement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increm0 6ojiuf5un57x i:mpases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incr kq1(rlxtjkp1p9:)b)-/hgkx4.dtzfd ( pdyf eases 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 bo44b08ice8o / a00n1 thmdkk,l bbirk ath double in an LRC series circuit, the resonant fakct0144b0h ba mrdnik0 k,8eio/ 8 blrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Aaigixn:d i2tt f9-3aa (1krc, 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 series RLC circuit occursg4xhwk 4d-5rd1j7 rs t 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 r3r0t +n xy4wkqadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Fin ntq0+k3rxyw4d the magnetic 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 uniform magnetic field of 0.2.x-2vhu:l 4pp7w x: e jxnxf3p0 T. Find the magneti7pw: 3puelpn4x j - v:hf2xx.xc flux 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 magnbw81ag1 cl 7nbc57afzetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of ng1 wzafc 78la b751bc$30^{\circ}$.

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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 ;33ojk*pol:8h;zjt q jay/yy u 0, swois 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 jcpqd d- 6-c+rchanges 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 frame withhe*ctuba7t 57 kh1+ro sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 Thk7t1rb u*o+hce7 at 5 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 tug +2 g8fo )c24hzkhje ybxb)h,rns 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 area69cha* e ,,hrl0uplbx $0.20 \; m^{2}$ 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 hor:3,zm)gl0yuletsdclt 9 4cu5w.tknr0-y / dj izontally at a location where the downward component of the Earth's t.d y-5,djycz/s m )0wtk rnuluel9: 34ltgc0magnetic 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 consta k/vx-d*sw +k+l s-*hkqlol9 re6q3j ant angular velocity of 2.0 rad/s about a vertical axisx/laqq 3kr+ h 6dk+voe*sl-*9jw-kls 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 50 loops arahxg2oum/-.br 75/ drepua 08 ur ot4nd 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 turnsv*5b.t5koi+ a 4q d 7ccgs *,:zvaouhj of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lo q tz)b.lek,29b5txw hop is 12 cm long and 8 cm wide. The armature re.t bz qktbh52,w )9lxotates 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 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 3hmmn,z/vts h;m 6yw: ejirrop oa(j)au7:; 2 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 tov8oz g k .kg)mo7u.a4m construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fg o 7.8gua.kmv)ko z4mield 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 with a maximum x1zheg8.i nf(fpa*c i af qt834r8m;o$emf$ 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 resistancsfrvo7g )o 10m(w 2*c+xojbxae 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 resistabdl7et gq(l:3fo: ta (nce of 6.00 W. The motor operates on 120 V AC, anql:3( l t bafo(:egtd7d when 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 resistance 6.0 W is connected to pzxa uw ), kj8e n2r31;rdes1pa 24-V power supply. The operating currentu)p ; a,d81w sernprje3kxz21 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 6.0 W is connected to a 24-V po1 yao7s xedsk9fn36y 8wer supply. The oper3 yd8akon 1yxes69sf7ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W r e5 7;+t+,gpnd9 ig ygeqkcq1is connected to a 24-V power supply. The operating current is 7pq;g i5qy+g9e d nekr+ctg1,1.0 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 prima) j5fftlyjvhn7+b: tli t2.f9ry 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 primarx -t9jpf--m ;cpm dgoul7efc4 o0zy+(y of a transformer causes 14 A to flow in the secondarz(-gyd o u ex4-cmtpp-cml07;f9foj+ y. How many 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 necessaamox +. a9vet k-n+th00df0dgry in a 110-V primary if the 24-V seconda dd+og-atk9v0x0fem0 nhat. +ry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary coi/pulhv y6fr2cxu srmb7-2m:6 jor3 m4 l. If the current in the secondary is 3.0 A, whlx2jc6 m6 2um/rprf4 rv7os u:hby-m3at 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. Assumisp;po 2 ,rou+- 9mmagkng 100% efficiency, hopom92; pos -,r ugkm+aw 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 +l66:w npwhlvtransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drawn w6l+p :v6whl?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coisof /z98r/beo5dd;j wyd *ah1l 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 secondardb5d 1jeo98ay/w r*f dh /s;ozy?

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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 turns on its s.i ts*cbjo4,xecondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the, *i.oxtjcs b4 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 its secondary has 200 turns. Ifnsr(j+ l(ofywo-0m;*ij qbz: the input current at the primary is 1 li; -: 0(mwryfszb(jo+j*onq00 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 turns and its secondary has 200 turns. Ifhbkyf fg;ad0 )+ 5fk/b the input voltage to the primary is 100 V, we can expect the output vof +dgbhk0)kf;b/ yf5a ltage 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 secondary has 200 turns. )x5 w-vy0i3yil .ofpt If the power input to the primary is 100 W, we can expect the power output of the secondart ywpl -ify.ix305)vo y 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 pk95io hu -(vvsmlqwg (8te 35at 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 t5v3pqsel5o w guvh8 mik(-( 9of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is bhi.p 8x-x hw9 cwhg;2usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in thegh-h 2p9 bh;xiwxcw8. 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 ofn38vuzlfxg-img,/rp9f g)/ rr: l*xwci b j+/ 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 percentage power lost in the transmig)gp vx 89nr/ur/gl / iirxb* +:-f,3jlmwzcfssion 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 k7 (k wx8 twwjg8:vx;gogjo0c:d4w/ocm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. j;8wo47wkodw gxot /:0 g8xj v(cwgc: In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 line7pl b(aux2zk. 50 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 turns ratio of 100:1. What percentage of the original energy is lost when the transformer i(p u.lazx2b7k s 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 le8u(mhx q zca9+ss power would be lost if the power were transmitted at 3000 V insteadc8xqhmau+9 z( of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line1vo0lvuzh;l0is gcw ,4bkq ,0 with resistance of 0.60 W. v,ibgo,hu4w0 0slql1cv0;kzTo what voltage must the generator output be stepped up with 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 ener1 +nwtp-sd3apyi2l b0 gy is stored in the coil's magn3pd1lbny ia+s0 t2-pw etic 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,p2( vsb szt0 n(h8)m:bbevrr inductor. What is this cir rv) e r((mp2h:s80bstb nbv,zcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltag,ux0/f b8p czte 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 ruhg-wi1 +y +speak 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 resistanceak (* fkw1u.wpld 3p+l of the lamp?wa.+1dupl*k klf(3 wp

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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 connee9p8j1m8afm2xy 7vbzcted to a 120-V ac power supply. What is the peak current thr 9zpme 7yf1xvb8j2am8ough 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 conb)pmqz ml7 , j21j9tafljmyymb4b ( ,9nected to a 120-V ac power supply. What is the power dissipated in thejf)(qtb9mya7 ,2mmmb1 j9j y4 ,llbpz 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 50-W resistj 89bvp0gl6al6 nf 7ehor 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-/hnu8d 2k2g e.q+zkgs x .ab(oW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W reqt r spxuzc8cx(jl 71x(:i75 zsistor 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 o;wi,ohnbh+ wez7h 5z*t +n) gof 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 coilu; eb2vw nc(ytww)9+tv z qt7u+tu0v6 at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of insde6 r.pl -;phwnf )a-ductive 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 necessarjp9,nn,p5 vcfl+ v,u xy for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mHdyl.s.ujfu 4e )l5.xj inductor when 120 V AC at a frequency of 20 kHz is ap4.eljd. ul ujxy5 s)f.plied 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 cx ntg;lw4 )8qyti naia+-mt*)de4t ;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 reactancczrq- p .9 /p)np0(puyxzloo4e 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 reactance at 1 yao48:33c 9 d ogh(lbfo jve1neg3m8w0 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 wbk5 zwq+: sy-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 reactanceh3 -6x6sw(fau hfmpjj 1su::u of a 0.010-mF capacitor be 100 W6uf3 : :uawxh6- s1smhjpu(jf?

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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 0.0b mfw79mc c;:.b y 1vdncs8m2pm 0zu5n010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac ser bo,/l yrs6it:ies circuit with 12.0 W resistance, 15.0 W inductive rea6r by/s ol:ti,ctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz 8uwxggt+2b3gtc 5,e /ru p(xw if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cow p5,8t2gu x x+3eg/(cbutr gwnnected 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 rcy2qda j)22;c3lv2symhm (xe/umem:o i l- 8qesistor, 20-mH coil, and 1.0-mF capacitor are connected in s omje2vdlyxai82h(-yc eu ql m/cm23 ;):qm2series?

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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 inductor, what isfgjfw :v-1o spzm 9/w0blc81l r5kp5r the impedan - f/ rrz5sol85lw p09f1jkw:c1pvgbmce 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 .jubu 241ywspn5 cne* is connected in series with a 20-mH inductor, what is the phase angle at 1005w*.4upsyeb u2c njn 10 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-mF capace79wn8u.a *du n jska/itor for a total impedance of 100 W anjua wnua7ed. s/* k89t 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 i9y/e*;qv/c fr dhs ab(;r,)jwgzh/zp s needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W;g (/dw,v *rhja qfb ; /r/hezsp)9yzc 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-m5xe13j 4syyls nci7. sH inductor at 5000 Hz for a total impedance of 40000 W . sn17jcle5i 3syyxs4?

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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 p e e mh726wfza*m xn3/el6q3mdut in series with a 100-kW resistor at 1.0-MHz for a tota3 *3hxe2 7ezmm nmlw /e6fq6dal impedance 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 o*80v/kmad,h0 hrf ( c9v;cfs 8 aajjx20-mF capacitor. What is the impedancej sfcjf , 0r (maa0hca 8vhxo8/k*dv;9 at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor bk ,divpg* s6f7cs *w2f9.ff9b 4caryat 1.0 kHz for a total impedance of 45r92 4ycd9sfffgb6 k.f7ai v*ps*wb c, 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 capacsn s z 9vhmiyx1q5hz( w6*+j*citor at 1.0 kHz for a phase angl1*vhm(6 win* 59qjz +ycssxhze 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 lgg/(h. nfdm w90.p mz30-W resistor at 1.0 kHz for a total impedanczn/wm.pf.g9 0hgm(d l e 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 -r ;+qwxa(ufywith a 100-mF capacitor at 120 Hz. What is the phase ruf+;qxy-aw ( 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 v 9-xm 9ve7shb100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri- 9bvhxsm7ve 9es?

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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 resis:,mrn zr51k jmtor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vnrj5rk1 z ,:mm, 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 rea74j/.swbe)d, wkr u gcctance 30 W, and an inductor owg,k)b .wc rd74se u/jf inductive reactance 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 anglerq;, l9 zcr5d 4s- d2fpgzp8zg for a series RLC circuit containing a 50-W resistor, a 10-mF c ;grs g9zz2p8- ,c4l qfdz5dprapacitor, 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 necessar6w2:cchxce t( y in series with a 500-W resistor for a phase angle ofw: c6hce2t xc( $40^{\circ}$ 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 hasp6wj10hc2j wj 07jfje waq1y- R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order j0a7hpjc1yj1j6 0wq wf -2wje 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 series circuit with 12.0 W resistancegc(:gjme29f5 h2c pwx, 15.0 W inductive react jhgx9cm(pg2:5fc2e wance, and 10.0 W capacitive reactance, when the circuit 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 circuip03 km6ofl b ex)ba/4at is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. dm 5udh7mf0 -pWhat is the power factpum 57-hd0f dmor?

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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 a9b 89yg.8prdx x m ee;ngo*c7 5rph6or series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hrxd988p96gho *erc.er;go7 mb5pxy n z 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 frequ,-z gub uh93sq b;d3drency of a 1.0-mF capacitor and a 15-mH coil in series?dzd-3g, uqbsrbu ;93h

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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 4f,nc3 p0; n flrdr e2yz+7kd/a.7-mF capacitor for a resonant frequency of;fdrn y7npe,l3+0/ zck frd2a 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 a 3.7-mH inductor for a resonant fn07rkir*n9xzt;lh yi)p x )c.s 72 luhrequency of 1li)r7t2c xnkr yu9*ph0s ) i.zh7lxn;000 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 resc8f9fc8 f r.)1bduqi listor and a 40-mH coil if the resonant frequency of the circuit is to be 1000f1 ul9 8dcbff)cq8. ir Hz?

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