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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 magnwgfb7. )02ki zwerg )betic 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 induen;qhzg. it 99ction 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 change c m e5j*r-1kyjon the induced1*j em5cry j-k $emf$, 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 -:ibglemb. o7 (w+og tof wire produces what kind of chane- :7(.lb +itogo mbgwge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire prj-9, j 3kdu dng5e7whp*/dozcoduces what kind of change on the induco/*-7 j ude53jz hddpn9gw, kced $emf$, 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 magnet qj *we r8pnjt*bw/o9d-e0eu5ic 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 conductor j f w)ge10 4pmrs/)zjtwill be that which tends to produce which of the followj1r)t)s /epw0j 4gmf zing 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 horie6q e)y. ylbq:*txowpj; d4e )*v8xm dzontal table. A bar magnet is held above its center with itm txo 86 )v;**b4d.q y we:qdpylex)jes 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 hori i.)4 r.l012swzjfdup zoyk/o zontal table. A bar magnet is held above its center with its north pole pointing down, and releaseir. 2uw f0 4lysko d/)zop.zj1d. 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 dxnmhy)1r/aa2 c 5bm8 where the magnetic field vector points straight up. The magneticch m8b1amx /)nrd5ay2 field vanishes suddenly. When viewed 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 table top in a region where the mru:vc3m.vi - xagnetic 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 incrvx.c vmi3u :r-eases?

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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 wh* tlpuulsh 282ere the magnetic field points straight down. The magnetic field disappearh8ut2 2ll p*uss suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table andt+q712 eae org 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 a2orge1a 7t eq+bove, 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 3 p1sgchl 82d(th p4poentering first. As the north pole enters the wire, the induced current l hps4h8321 tpop(gcd will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated 2: o x3n19jfrg t3 blun7ni.uxat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must bgbu1 3l x:2tfn ri.xu39n jn7oe 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 rotl 5g bd/1ypio:hjm6uwrkj9jfrfols +h(234 4ated 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 inllfr4/dfrog53 ij o2(w hp h+1yj4b9j usk:m6duced $emf$ 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.be uj3 -xsy0(pywg71u
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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 thae2l /y/kjf4z bn1)(uctoxf:i t 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 magnetic fihjbc7anpd0-,/shkj )eld. 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 h n5h/+,of8lwut -dcjthe east-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 jt-+ hh8l5/ cw od,fnurod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angg) jms,v7j ix7iu*ltr+advp:v zz- 1 /ular 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 rca/ fuj5h0l.ansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotamd 2 )qs +1stil+q;wodynjv)d7)p x4ites through 60 revolutions each second. The frequency of tho)qdwl d7 xt;iyq+ )1isj4+ dmsp)nv2e $emf$ 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 devicvn(0+-1g6 h sdsd8ja 3iykarbe 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 device 2;4xzw6ncofwnazf3 8 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 lot+9vs ihmd,p5)gtsi ar3z6h :ops than the primary coil thz35:)tiprsi+v d9h m, t6sgahen 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, ift;h3el-cu shjju8+,f m+ st-n the primary coil contains more loops than the secondary coil m 8uj3t;-s sn e++tlhhcf,-uj 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 power y 84a9tn.o/xx )qhpha 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 resonamhsgdm-cg 0d(1gz .w6 nt circuit,

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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 zb 1gppfuj 7w6mabjn/2v*az+cd 325pof constant terminal voltage. At the moment contact is made with the battery, the voltage acr d 6b augp5zf2npac /+2pwv*1jj3m7 zboss 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 batter ka-i 1sp6g4foy of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductoias1op- g kf46r 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 indusv rrt /z/qh *s7u.oule0yt;(1kb b00f7mdxzctance 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 wmx+0d 2 :lsut bk80y:l1p yoneith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductoe:*dpd.hhu )hf+p /gn m*z t)wr are connected in series to a battery. The time constant for the circuit represents/ dhg* ):d)t ehpph um.f+*wnz 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 battery. nyh/.alifsr6*zdtvyt r* m8)r x+-,h The battery is suddenly removed from *)sfh ,hr a .l+t*-6dtyy8/rinm xvrzthe circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sameb/n 0b wz y0s;1 .ldive*kk9q 1yjmg0a 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 poweag s+piibfy ;/jlx e) g0a9iw0-y:/ rpr supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cit )*,y afxap j f6zf4g()3eoslrcuit, the current zfpj3e)t gf46o,ys a)lf( a*x

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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 factor when trbya:)0(q2b cytuc whk+em:5he frequency isuba5c: +ry q btwy)k(m0hc :2e 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 aq b9e 66p b8w.ryyh7btcross an inductor is doubled, the inductive reactance bpbq6ty8hyw7 be.r 69 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 in1(;rfn fiq e2 s9fo1aoductor approaches zero, the inductef9 qoa1rfn(2s o 1;ifive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC powei./ibu ;py * /2wdyzjxr supply. In this circuit, the currentd yy pb 2zjx;./i*u/iw

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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 whw*h-r n2ix bkq:sz9r,n: pf j5at factor when the frequency is tripled?if-,r: q jkhsnp*xbw9 :z5n r2

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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 capaci7y kh/9ci8w* oaf+k b30l sr0 va5 shwz7qvnk;tor approaches zero, the capacitive reactance ofbs/0 vfc;a9ski l *z58+ nqhkrvh0woa73 w7ky that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor an o* se/3wmm)3noq6fk fd capacitor in a RLC ser os3mfe/f*qm)wn6o3 kies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit 3/us/ 4ojwde80ir f 23*df*lpfq g 4rxvy2objis 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 lr(uzq)kv/ryq:z1 ,kajl5/yincreases. When is this statement :ql z1)y rq avk,l/y5zr (u/kjtrue?

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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. Th5 7.fpcy.sbtc e impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedancegj-u2lt f3na 8 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 doublrvpk- e zbypnsp* 0(;t:0aq o(e in an LRC series circuit, the resonnkp0eq*a p-brs0(:; z tvy(opant frequency 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 apr9r.b+dbz j(w plied 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 wab+ iu xj1 iz ufm;;;wktm18z4hen

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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 uniformv57ld5(0.y, f cdf3 erwrknbm magnetic field of 0.20 T. Find the magnetic flux through the loonv. dkrb3fymfd(575e c0rw ,lp 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 unvr+tv 5w0psj/ wr.) jfiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop.sf5j)p+v w0rvwt /jr 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 radiudz/;v 1kh:4 dqojwsm- s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t/mkhzds d1 j4vqw;: -ohe magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frzawy)6;sp jc8cw 9-ttom $1.0 \; m^{2}$ 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 cha7db-o3ghg3hwv fo8 0 lo-(lbh nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 1;hgj:z:7 hrzrluo 9/z4+ ks;gkust:u8 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0;s: hk hk9ztzu/u os4 g :urlz7;+rj:g.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 an ) o*:b nh3bkmearea 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 uwx 1+zd582g r fy6df;f*vofxarea $0.20 \; m^{2}$ 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 fliem: kfq6ft fts):tj3ms-5y)7t) pq qbe s horizontally at a location where the downward component of the Earth's magnetic fit-m:)yq5 s36qt ) jsb )tfeq:mp7tkffeld 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 constanti 9k5ihiltf3 * angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnek 5l3t9ii ihf*tic 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 lo 56yqnkf2 ge:iq 7+uvkops 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 oow4- sn:oie3af 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 re 3 /m-h:w3fyh ql4-:hgroz kwrctangular 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 loophk rhwg-:q 3-lo m3r:whf4/zy 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 consistd 9; hwskxr:of) kmy0qq) x*a8s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12voyp*j9o+mj1 f(bgzo 9az3g ea3)g +h V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatih9)mv(j *9 + bgjo g+3gf31epoazozyang 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 generats(dnqag*qe)xruqa t;4 *)r 5uor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor haqt8xuco 6lqyzfqw u+ 66z:a, e jt*1:xve a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6h-/xa4l lux6,a, q hzl.00 W. The motor operates on 120 V AC, and when running at full sp lxxa 4,q,/hlahu- lz6eed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powe f9(lwp* 8*zbua+frtfr supply. The operating current *8ufb fz*lr w pat+9(fis 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 cd:q mx2 vc6ff4onnected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha:x2vdcf f 6q4mt 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 6k gp4ch :x8i.k.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fu g:ph8i.k4ckxll 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 transformk.o(ex pb x7)per is 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 pryz8 ,myy nb .p.cg4pa)imary of a transformer causes 14 A to flow in the secondary. How my.ay,pm y.8)gb pczn4any 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 necessarc).p+oa5jlz t y in a 110-V primary if the 24-V secondary has5plo)t.zc+ a j 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 zmq q8z+218kllhka0: s 4vjkda 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currentk01za hqvl k+dz8s:lk8qj 2 m4 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 prq siwo.f+p3 ;himary of a transformer. Assuming 100% efficiency, how many am3opfw; isq+.hps 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 transformer provides 7500 V at 10.0 mA. The odk(vpy3/5b3v(rxtq3k3qbmtt y 5 r /primary coil operates on 120 3t3rdt5(ob xv/3qy53b(qk/ kyr vmt pV. 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 on its prima (ttrs1nlgybviw:(r ge ;u,m(qp5o( 1ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thptgte 1(1vrb:o,l myq;(s(n5w gu(ire 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 30/.uws3 cfyqtlg zq7e.6+mn y10 turns on its secondary coil. If 120 V at 2.0 A is applied to ncf63gy1+yz.ulems/7 wq .t qthe primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondarak14g 93by bs*gu b4.qg1tzty y has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seco a4g4sy3qz1ut b bk.g*9g1tbyndary 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 seco 5bd9azcm. 2tkndary has 200 turns. If the input voltage to the bc.k5ma z t29dprimary 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 1003t7h7kpb fq x9 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to beq b73kxht 7fp9 (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 currenfu rt1hg/h*w,t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the ,/1utrhhg* f wsecondary 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 usubhzq,wm3 w s :g4fyliu-apsp 1a8*:0 nally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powg 3pwh n4-sm* zflai 0:,p:syuaw1q8b er 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 vorz h-eeo:+vgd lj.2 5bv)zmn. ltage is usually stepped up t2 je .gbe5z:vz.vm )n -rhdl+oo 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line 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 d4toid: )ywge/w;rb)b2*ud ptotal resistance of 0.60 W. A generator produces 100 V at di):dt) b b4wo/*drg yuw2ep; 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 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 k *wzi: z6fssgl70s -vcw9rs(nm 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 transform 79s s(z6w*:-z f lwivscgn0rser with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wdtq4esprox . j ,-p:sb-m*bs.ould be lost if the power were transmitted at 3000 V instead of t*q p s4s,rb d .x-o:p-js.bemat 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generat k2l9:o.gw p2jlkt 8ioor is 440 V at 20 A. It is to be transmitted on a line with resista9:8lipkw l2 ko tg.2jonce of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in t/5klh9c6r2 ;qfbozv-ucr( k o he coiluzqrk9 o52hfo (cb ; /kvcl6r-'s magnetic 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( o;k fgmyq71s a 6.0-W resistor and an 18-H inductor. What is this circuit's 7qfy ;(1mksgo 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 cjs1qb2r r5kljxf16n 3ircuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is/z:e x(k-pwtz*zof2-8j ume k the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into :ig o+mt)+u h iintva;kf+lzzq95)p0a 120-V AC outlet. What is the resistance of the lamp?9ihqltm)z+tg:+f )uz v0a i k;5 po+in

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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 120pa fbs9a55; 8 kah3v.z0gsww ju i6hr,-V ac power supply. What is the peak current througbipaws3 wj,a6h5. sg 9f8 khuzva5 r;0h 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. Whatt+ye*dwl 7f03uf ll*t is the power dissipated in the resistor +dluw* tyll0*et 37ff?

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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 isn1(lut4zxbi , qa6,ej $I = 0.80 \sin (240 t)$. 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 8afg29vom h)r 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 5l17rxwx:t k+md qbks 48k g/u90orb6l0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of 3i3t-jpeyvf +xa.g 7r(n fsf. r6t-r ka 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 o o(tm0oyh 6k1cf 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 have 14(bfambp7p* vs/:yko2 .0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1v so:q cvic yf,8(+1af000 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 ye x5n/de9/;r3fca .(;goni o2nfmz vfrequency of 20 kHz is9 (;cn/zee/3iv.n f5a ;yo nrf2xogm d applied 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, 60izqq1 0 s2wik ivngqw a84;) 69svk4/qitisw8.0 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 re3a o0;frwf:kx actance 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 10 kHz?lp 1g 48 r vgp;ziu5qp+4iwn u.t8znk*

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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 reactance of 1200 :db* rl+jjr h)q44iqdW?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will5y 4sn6wjo5 yoatou/ 2da.qh ) the capacitive reactance of a 0.010-mF capacitor be 100 Whjy t.6a5 42awdo)5oqun/ys o?

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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 0.00a m4 -3qyjpiuf4,dj5p 10-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 with 12.0 W resistance, 15.0 W9-wz fy/nx 7az inductive reactance, and 10.0 W capacitive yzz7-f nw/ x9areactance?

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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,;vhrd v) y)fpui1k2b/cct/s)utq -l3 20-mH coil, and 1.0-mF capacitor arv-u /c )/f2l r utyvib3kc1sh);t qd)pe connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500nm-frp-m2w*2bvg ,h tcem6a 4 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac6anf-m2v2h-t g4pb* re ,c wmmitor 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 connected in series with a 20-mH inductor, what is the sgcc-(/xcm5dt) +um dimpedanc(+tcu5 dds/cmx-g) cm e 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 seriwq(ehu*-8dzwd *5j,4t bbydi es with a 20-mH inductor, what is the phase angle at 1000 Hh*(5ywzeuqijw4 -, 8tdb d *dbz?

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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 ci1b,z fh/dw( nbrcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1f(n1b /dz wbh,500 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 heah/4ao-a-l*9ev jon k5uz:kh9ps70x ae. fith a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hp9o7 9l. sku-a*:/h4 xe-5hhzfkajvanea 0 eo z?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a toz)/( k lmd+nkctal im (m)+zk/k dnlcpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor 7n8okjb m3+m() mn:1bxu 7sisafhb1o at 1.0-MHz for a total i1mbn 3mmi:b18 (b7jonsa +k ufo x)hs7mpedance 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 gvqfir/61fy; *c 5*x;u bgo rzwith a 20-mF capacitor. What is the impedance at *z;v*;xrg 65f iyqc 1ourgb/f 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 1.0 kHzuidglwk15w + 9 for a total9wgw d 5lk+iu1 impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a xb,,33qsx7p zbr(+ich ji.vd10-mF capacitor at 1.0 kHz for a phase ani+bd,qspxj3(xhbv,rc3 . 7zi gle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for 5q :*krw*o,ygzwl,rla total impedance of 45 :5w,w zg,rl ql*kr y*oW?

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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 c zizq),yf; *mid n3;zlapacitor at 120 Hz. What is the phase anglem,fi*;z 3ydqi);zzln?

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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 q;bw e 5xq0vz21500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci5zv w2b;x0 qeqtor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit co wl.11ucja z:xnsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuia wlc:u1.1xzj t is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor vczmo4zo m;(q;c s.e9 of capacitive reactance 30 W, and an inductor of induo qc4.zem m;sozv;c( 9ctive 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 angle for a series t4 s8ko*h,eft RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conneef*t8,tko 4hscted 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 seriesu:o q;3a6k w t.bbs 5ygp.e)sz with a 500-W resistor for a phase angle of gpb:ks ;wb.a5u6eq) y. st z3o$40^{\circ}$ 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 =f/gs p.388bf hdib.e h 10.0 mF. At what frequency shbd . p8h.sg8fbh3 ei/fould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit witm:h d0j-x5 zsx(myrq- h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sup qmh:xzsmr 0(x -jyd-5ply?

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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+inbs0-uyjl *oy2g,c; ttw8y AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 mbk y/91rx.9omu .a 4ut pc/weW. What is the power facto. pt/ 9.aeko1y4b/ummcu xr9w r?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resist ( y+8frldh6eqor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sfhlryq8+ 6e( dupply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonantl/yk2g(/*y bigw z ;vb frequency of a 1.0-mF capacitor and a 15-mH coil in series?(/z* g2k;gyiyv/bw lb

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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 serqo )9bxj;hvw*:hsoj .ies with a 4.7-mF capacitor for a resonant frequency of 10 kHzbj9 hq)o s.xh*ov j;:w?

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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 seria/x,qd uh0q9b wj69j q sz*,ujb fs:1aes with a 3.7-mH inductor for a resonant frequency of 1000 H* d,bqa xuj9q1b,jsj/fh u6 saw:z09qz?

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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 se3c5k6 jcvc. 5;sryfr bries with a 30-W resistor and a 40-mH coil if the resonant freq5j.cks;5 yf3rb6r vc cuency of the circuit is to be 1000 Hz?

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