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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 magn sj,wx m(c20 pbtoddzz3-dz3 1etic 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 inducti8l :f-ft g7oujdt.1ula+xr k+on states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changee.4 t51l6uq4*wdd mrd k yq1no on the ind 6y 4qdrkd1*uetd ln q.m15wo4uced $emf$, 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 tejlp/9 q9 egvh j93*bahe magnetic field through a loop of wire produces what kind9vg/e3j*q 9pjhblea 9 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+07dgubmve:zm jr ( n8 of wire produces what kind of change on the indurjbmd8m :z+(7u 0ngevced $emf$, 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 h;i .4xgk:xg8 e34( ozynb1y vocsb*qfrom 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 lhaw.i3/;r cuq aw, the direction of an induced current in a conductor will be that which tends to producia;3. qhcw/u re which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar 4y xqxj((/ylhmagnet is held above its center with its north pole pointing down. The stationary magnet induces (wh(xyhj/(yql x4 en 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. bljbldx n8cz( k0k50wwe)i:s j*3 px- A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnejksbldc(i3wb) e x5k 8j-l0 0 p:nxzw*t 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 tabley 6kw 87f3x9beorz*om top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When b o8mr6*93oezf k7xy wviewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level jog.m)lu 5aqc2;s ea2table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of th lsu5g 2;c a2me)ajq.oe 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 tabkil, uqrzbd nhe0,(1 7/amdu9 le top in a region where the magnetic field points straight down. The magnetidz(0hqlu,b1n7r kimed/ u,a9c 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 w u0nnp8w e;hjuy5e66 lies on a horizontal 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 ab;6n5 nuyj06ewwhu8epove, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first5jgj t:r,cak0 . As the north pole enters the wire, the induced current will be (as viewed from above)kjrgj c5a:0,t

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated (gxnm4no+hd e3doqf5k98 ve 6at constant angular speed about an axis whose direction can be varied. In a region where a5onq8v 3 f4eok dx+6n9 h(gmed 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 is rotj em qn;(e sytd-tw/.3ated 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 in(.e m/3neyjs-wd tq t;duced $emf$ 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. f.vdy vfl(6bfcg e.o:h;nr+(
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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 an l -. m 2 ;u:ohytf*rrtstf*s8t$emf$ 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 magz azqcf-w 9 13h-toktsb1 z/7mnetic 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 (-xiba7ma/xq -west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potent-xm7q ia(abx/ial 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 constanxkkpy 9mp-w:8frog. bj t5rx0 1 g7x8yt 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 transformsbbmz 1 ;-e+j 1lvsjh9d

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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 frequency oq m3j jd,22acty 2j*q 0hrw9obf the oq9*tqj 0bac2jhwrm 22jy, 3d $emf$ 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 uh u00ox- nyapzl*q(luhytyu: , /8sp :sed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device the2aec;7 zyw-b); l; iskyv k;qat

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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 morey7kxabc-wn0b0 v .,5xst;g wb qg6v)b loops than the primary coin6cyx b;,q0vs0g5 tw7abkw-g b. b)vxl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil conrw472haxa z+:w /ks tatains more loops than the secondary coil then i w/+szr7 a :t2xawk4hat 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 pm3 ho+*oc t r89a,pkanower 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 c8w( ddcsroz,895+a0p k/no l3cvq swxircuit,

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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 connecte(cli)xd,76j yval8, gt oiw;zd in series to an ideal battery of constant terminal voltage. At the moment contact is made with th)z xtji8 y;l,c goawl(,v6id7e 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 inductoppc/ hsf:n0m5r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thesch0m fnp :p5/ voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista3o j(0- ,yuvdl6c vzvpnce 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 anpcpq :p0z+*in-2vxuo $emf$. 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 ec sox:uk6,( a(zsmg*in series to a battery. The time constant for the ca,( 6g* s cuxsmk(oz:eircuit 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 r+7vct rn (o t6ecp3bf 7d-)bqbattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tict3 qoc+r7rb)7evp 6( dn ftb-me 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 sfe3 g 08n ;/lrehn2fqcame 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 t 3.r9im-itzoc:2dkg bf y1r*eo 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 connectedjy +mh+k;rz7-hrw ( glu2,xit to an AC power supply. In this circuit, the curren-;xk ,7jyw +hrtul( gi+rzm 2ht

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fp3zka./b u lbd1zz v5ys p8(*hactor when the frequency is8z51s(yz *da vhzbl3upp.k /b tripled?

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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 f zh.. d. qoj:81kc3jn9yecbae reactance of that ino 8d.cj3f hc9.n: 1kyjzbaeq.ductor

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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 indn3sg 3,s,pm awuctive reactanp, w m3agns3s,ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this 19.cthz 36 n;a qx/ti4pcadly circuit, the curret; nphz4 /ccq 9t i6xda.a3y1lnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance iiw:phov:dhq7 00wdqo xf- 74sn an ac circuit changes by what factor when the frequency is tripledx wqiod7:0-s o f4hwqd07p: hv?

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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 capacitywv)n,jx 5e)l:d ..cl vooq1 cor approaches zero, the capacitivj on)l1.c5lvoqcdvw.e:yx) , e 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 an*on3h 9 v6v/y t ,4uqj4uetczhgle between the voltages of the inductor and capacitor in a y*4t h4uc tvhejz6/no,v 39 quRLC 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 circu.1ajm7 :,9d pigqnq +j+-uiqk zzbgb.it 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 circuitqv/e ;*4 eblb;3l bbut. The impedance of the circuit increases if R increases. When is thisutb4l/l3qee;;b *bb v 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 circuit. The impedance of the circuit increasesce0nxk)ay 4* *,dei/hw c1mll 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 increasevl2, .( zt,f/ l(w4ccpaqo wdm4kkm t1s 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 series circuit, theh0t(vkbdg2gq/91xkx6 5uas y resonant frequencgavhybt 1g0/qu 5s dx9xk6( 2ky 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 f9vins :k z/:f6ocvi9applied 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 occurs whenarr,6vbz i8zw*b1ox3t1- jdn

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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 6pu ym z,;4 o /fty2j;7xhbdw)(r:px2scv rjcuniform magnetic field of 0.20 T. Find the magneti f2/d)u;,(cp6 ;h r2yj 47:rcvp wjyxztxobmsc 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 magnet/x,m ;cghl5pbic field of 0.20 T. Find the magnetic flux through the loop when the plane of tc5h,xg/ bmpl ;he 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 i4a(xa*vhm sc +9t+fm cs 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 field vector are at an angle of tm+4xsc+a9(h*m vafc $30^{\circ}$.

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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 adjustabl ) tx(yik,vp :l2x8ihk ujm0)le single loop 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 changes s;g s53:o2; v 6mkav(qqts (icntt)f e- o/xtofrom $4.0 \times 10^{-5} \; Wb$ 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 w o.4n9f-obheon a square frame with sides 18 cm. A uniform magnetic field is ap9eoo- .b fnw4hplied 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 abye3 jjq*ivte5k ;b* (n 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 ehs3r0,bzj2y 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 wing sp5h +ncig:f; 8f+fmgjj an of 60 m flies horizontally at a location where the downward component 5j+ fm8 fhc+fgn:;gijof 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 u*)pwa5 +hx mu2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whilea5 u*mw )pxuh+ 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 crosxf:*.tmzvdbuc, -fo2 nh6fe h-mzi/8 s-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 14sgn hc5m-ai,00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm lou u9+-79ho5vsgxk incng 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 of this xuvc9oi7 +h-unk9g s 5generator?

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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 of 9*uji zte5v+su)m q21g;xkk8s xe ir0area $0.090 \; m^{2}$ 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 at:xs+ g,c-93rr/zy- a tde kim simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coilmy9-- ,k:+tag /se crdtxzi3r 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 generavtx, hzb;k9d0 tor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motnrwirmi7, (y1fp j5:v or 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 1*jxz8 pyz;kd zovdc--p x1/:nyjr*kv ;se 0 xhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed i vxx*pjr;- z-do:0 c1/xp zj;yd1e*kkn yzvs8t 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 poffv smb-vnr2w9 j6: bcw,j)/ywer supply. The operatin)vmv fn9s:/,j2b wj wc b6-rfyg current 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 r7hg;t7uk bcz jjbz/m 0xee( mj1f 6,7kesistance 6.0 W is connected to a 24-V power supply. The operat7 m febzjkz/kh61j0jbe ;tg7xu7( c,ming 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 is connected t rdcntxq27+,giw0/ lzo a 24-V power supply. The operating current is 1.0 A at full speed. What is i+d,xrn q0l 2/tzc7gwthe 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 re yp:tga2u 577c5 d0:eostoc lbduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in tv :n2e txv4:cv:fqi8 nhe secondary. How many turns are in the secondarvv4n:8:tf inqxevc :2y?

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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-V primary if the 24-V +u41kglp i 8-73ts ovq 9dsgbcsecondardo8lt pqgg 17u-+b4 3c9sksviy 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-tuou) *6wy5np,5caw/tirx) hfi7j r*xjx rr u60rn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curr u56hrwc6 ny*pxi ri ,j)5r0j)x ax/*t 7oufwrent 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. Assuminpcq7uv/f b8ixw0 . iyavq9:+lfd5w g:g 100% efficiency, how many amps at 24 V can flow in the sqc:g/ . qlw iuwfd+ 7iax9vf0:8b5vypecondary?

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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 transformerh;ya-(41oluzhq d; t k provides 7500 V at 10.0 mA. The primary coil operates dq h-zt1;ka (olh; uy4on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns myy*//bb eqad1ezx f+ j)4 er(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 the (jq/y* yrxe fe1 /)aedz 4+mbbsecondary?

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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 co anu )n 0gfa(lzo5mpe1vgs0 (/il and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, 0lapou gne 1 z(v/m0)5asng(f what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. rc/;lr1h pzompv2 ;,k If the input current at the primary is 100 A, we can expect the output current at the secondar;kr p1rvzp o2mc;/h,ly 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 transformeri0+:pw: sleqr5m + ebe has 100 turns and its secondary has 200 turns. If the input voltage to the:qee++5w0r ms:leip b 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 has3oi8aeb42e s c 100 turns and its secondary has 200 turns. If the power input to the ces3oi4a2e8 bprimary 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 60 A of current at 120 Vaop(1( fucz+e . The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total res(u1(o+pazec f istance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The pw0- ;6ja)x v vzf* -z)u; fy-yqakzwnvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W fwvauy6k) z-v-jpyzn*a-fz)0wq;;x . 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 s/tzwbqfy0. 5 o9qcs3 stepped up to 4500 V by a transformer and transmitted through a power line of total resistb9z sqwyf/ s.3c50t oqance 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 total8w iy/ pfv1ir91t8)moh c,cq k 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 would be lost if the trano8qticpf9m1 yr 8h,vcki1w) /sformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a vi6c*g-g *ga xtotal 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 ug6ai* gx v-c*gp with a transformer 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 a,8 9d;: 8) nkowgxah,kgn ncydt 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead ofkh: d c)gn nng9yd,w 8;8,axok 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 q9.4+jirtvh kon a line with resistance of 0.60 W. To what voltage must the genejth.+ i4rk9 qvrator 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 m4gm y 0nqts(l-uch energy is stored in the coil's ms-n(g ltm y40qagnetic 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 an3mq4 lgv 9gm6ud an 18-H inductor. What is this l 4muqg63v9m gcircuit'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 /zm ci zvmi(k.+jq1/lvoltage 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 peak curvw4 jd,-xha0) uyl .-ocmtsfws u7t+9rent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of )d2/j.02xpcoxpgr cv the lamp0gpxd .)/c2xr2c pojv?

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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 supply. What is the peak cursjk 364k;zl)3i e47kr3o o,cghl8ej-g qwjocrent thlk3oer3os ,w7j43gl i j6)zheg-jk4c ck;q o8rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wha0q:1t6bjcxe g t is the power dissipated in the re1qg0c6xjebt: sistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ,zv0n il2r b.;od8mwe*fz )j ris $I = 0.80 \sin (240 t)$. 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 59nm29 oag 1no7znuh 4ts/y) uo0-W 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 resisj/trk15 uizh .tor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor+4 lt9)xf l 0znqcyd0b 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 reacta5fg8oj*,ie)ul nv ,a0wjxk:b nce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil ha3y:7t;sbn (o wf t2qdrzwc0(.tw u1iove 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 fo b-38yswgx( p de+yo3 r ,xk7a7o)igssr 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freqh4utkg:2vv t,p0uvsf/ mh9 y 9uency of 20 kHz is appk4/2 v gvhum,09 t9uvt fh:syplied 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 8f6* y xb vy1dnwr(q5xHz 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 reactance of a 4.7-mF capacitor at 10 kH 33 -ic f.0c -htsdz1,tmj*rsi6 wrjsqz?

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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 cavhw2(l tb s-6e(( a dm2tskx2opacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capaciteb6.sqx5jr 4iugsv gu51 03-qfuy r/k* aowc 3or have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitivbpp,f- i az8:v(m: n1qr yrnq1e reactance of a 0.010-mF capacitor be 100 Wa8rnfz-1virby, ( p m1:qpqn :?

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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 0.00109wm 0feuwf*fx( (m ;xz-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 series circuit wed;e 006fujcud6q 5am ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive r6e5qaf;0ejd 0c 6mudu eactance?

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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, 20-c3sp 9pdo3xn, mH coil, and 1.0-mF capacitor aredp3os xc9n ,3p 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 angle5jaz.,w9(j cjqy d ly) at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c9(),z5jwcyj lq da.jyapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connwwq9 dlk3 (m+oood2mk2(ai(0frz t1 lected in series with a 20-mH inductor, what is the iw29mk(o(r 0m( 3dlda +oi1fow2q lt zkmpedance 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 wi9:kl 1 4xasn)*z ybc;ad grm7bth a 20-mH inductor, what is the phase angle atkc4 *sal9 rgmxz7:bd)a;yn 1b 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-ma 5ugxuz3* o9vH coil and 1.0-mF capacitor for a total impedance of 100 Wuvog9axu z5*3 at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor an4tfzeke ,b ;5ad 15-mH coil toe;4,ab5e z kft get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor ahrg29nmv.,.b eoy m/mj za-o 9t 5000 Hz for a total impedance of 99zb.ra/jmhmy . enmov2-g ,o40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fm+lk2erg 7nthr4 s6ln0 h, ul,or a total impedance of 1hlnurh2 s+ ll,mt4,076kg ren50 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 selq xm9fg- jb g xl:8j cxmj.4hu(x4e43ries with a 20-mF capacitor. What is the impedance9x hjx.jxlx84m3(m 4f4qe- gj:lgc bu 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 at incml9m 0ujau6w6). zxf 1es/e vk+8y1.0 kHz for a total impedance of 45)6ueem 0+k. fc1 umisz a69n/w8l yxjv 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 capacitoru;uvabh9u x c/9ni8 0w at 1.0 kHz for a phase angle o ;u9x9/ v8wu0ihcnub af $40^{\circ}$?

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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 ser7hli 2x s).zpj/ghtb4ies with a 30-W resistor at 1.0 kHz for a total impedance o.)l tg2 jbhixp4s h7/zf 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitpdvd+pz (-h lrh;l ;y7or at 120 Hz. What is the phase angv dplh(p;y7;hz-+drl le?

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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 j5 (zjv- f2fduresistor, 20-mH coil, and 1.0-mF capacitor are connefu 2(zj fvd5-jcted 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 capa88n07eyr) pnjea:2 xihcd 2b*. gcki ycitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit 22aec0njh i8yi:dx8p. )egk7 cb n*ry?

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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 of9lyjbp 5e heea:1 t)1s capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power se)je yhsb a l15t9:1epource. 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 seriesqloq,8odt78ewc 7cr; . 9iuqk RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45qe;od8, iko7rtc9.qu78 q lcw -H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase nam ba741hd,. jb ro,langle o j,,arnb 1lmd7oab. 4hf $40^{\circ}$ 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 0uz8rt * qojux +076fl vohek2= 10.0 mF. At what frequency should the ci jthov0*0xl7f z8u eq ruo26k+rcuit 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 4z f,no4qbh. yseries circuit with 12.0 W resistance, 15.0 W inducti f4nhyqo4z .b,ve reactance, 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 cir tfh /q.- e u;x1b -lejx:gq9mphxqn-sll(x3,cuit 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 circuita4.1;0 qrh2t.d.ivvqr xxz7c ust8fc has an impedance of 60 W and a resistance of 30 W. What is the pat1q04v sxcirdq.7c.txfzu.hr 2 ;8 v ower 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 :g.ou /-qhz a.fo hc1gseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedguqcfo/ 1h:g oz .a.h- 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 1- e i 5islbyk3lzl4i*tw;g8/og)4dgn5-mH coil in series?o5k lilwlnb4d 4i;i* t/3)ge -gg8 szy

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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 capaci otg63ysg2a sz2*aqh+tor for a resonant frequen +as2thg 2a6syqg zo3*cy 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 neh3b7c n (gc-c,vguk z/eded in series with a 3.7-mH inductor for a resonant frequency of 100,3vc- 7 cgkzcbungh /(0 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 resiz-fn3ntk 8:h ff:b8zl0 r( acbstor and a 40-mH coil if the resonant frequency of the circuit is to be 100h zc ban(fl:br:ffk 80t3-n z80 Hz?

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