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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: 游客未登录  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 magne rs) )8d/xsilvtkv5 mh kbynjml5 :-/0tic 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 th-xee.*svg k)e3fn6z pe $emf$ 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 chb6+iy*)4p:xj phq mul5y/+2fj um wagange on the inducedx4g+:ylmh)qw5+j2 yu j /6ap bif*upm $emf$, 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 throubn9cdf , ujx*:ee b.b erlz8m/)we 41ggh a loop of wire produces what kind of cbcxegue bfm:d 4r 1).*n98lz,j ew/b ehange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the i.i 0hs2 xc.vxvnduv 2cixvs 0hx..ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field anmei,;t;w *mdx $emf$ 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 cond(09 ad-nj f3f +q7g( ukntcfozuctor will be that wha9( zff-q c gk730onjn(tufd+ich tends to produce 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 magnetpc vv6 - mb0nb ;615c:m nvsgpg-e4khk is held above its center with its north pole pointing down. Thv06nmhc v k6mvbpe 1b4 s-;p:g5gcnk-e stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablehmxxs 9.dv+z4. A bar magnet is held above its center with its north pole pointing down, and released. As4zh+x.9mvdxs it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poic i8:m5b5vy 87uqbi x,y9elphnts straight up. The magnetic field vanishes suddenly. When viewed from above, what b,ueyx q8 c7pby5m5vhi9 il 8: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 87 co *u-i koq,s8o/zr78p7b6mxgee1lw zz ra magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current mzapc,r88q ig -l erz7e1wko o8b7uxo6 zs 7/*in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a rezow,0o,6jb m ibs 7;xbgion where the magnetic field points straight down. The magnetic field w;x 6i7bm jbb,,0 oozsdisappears 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 5wxgeu+d ),9 uohd pc)lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tcou )+w5dexu p)dg,9hable, one on either side of the wire. When viewed from above, 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 fir -:n7ays i*p6xmu 0almst. As the north pole enters the wire, the induced current will be (as view: a6-p msuynm7il*x0a ed 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 at constant angular sped6 x 2h6t9lizbed 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 the62 zlh t9xid6b 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 rotas9zj-3 jpg p1+rcdb*/hs ah4ited at constant angular speed about an axis whose direction can b3 4-dsjh1p rjshg zp*/cbai9 +e varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.c .8tua az*jz+i,l6 sj
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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 thapmsnj 3,l / :1u-wci4n j-ejir-plv-et 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 field. The 6ze4qvtk) qd lq7,3hcw c3p1y$emf$ 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-westh1p9zh(1rab f9rl jc 7 direction) is moved northward at constant velocity through a magnetijc( 91 lphrfa1 hr9z7bc 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 rotates at a )f)fxu ,jri qy;rg k+7constant 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 transformspk wcv6za51oxq00ea3

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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. Th 5bzal1/5hvtse frequency of the s5vb h5alz1/t $emf$ 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 used txtkk2s6r 5gs-o

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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 tc tinpck m2m;f37r00z0m, tz *(o 3ynxwad,jwhat

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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 con9.a:7gc hh tkt5mhpn, tains more loops than the primary coil then it is .agp:thtnm h9k,hc57a

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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 primar td20tcykje/5y coil contains more loops than the secondary coil then ij/ttd 2yck0e5t 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 inpuzuez+ g7 gtia,6z ba3zvht08(t

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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 resona d)4j8.guobb ;sw gf0jnt 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 serq8f0y9kta9u nies to an ideal battery of constant terminal voltage. At the moment contact is made with nk9fu908q ytathe battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery 5 skxd)z5qk0 vof constant terminal voltage. At the moment contact is made with the battery, the voltage acrossdk0k5)q v5zsx 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 resistgn* p *dkm8ry,/qmrnd q,80glance 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 c+kt7 h6k(t :f6il1rkvfi )dpresistance 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 inductor are connected in ser6wvme:8je p -aies to a battery. The time constant for the circee-vj86m ap: wuit 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 battery. The battp4tq0 iluiuwr 6t y3 +mdwejg /a9i f-p5a9,k.ery is suddenly removed from the circuit. The time constant for of the circuit represents the time reqw/5l3 u96 t9 yu4teiiaw ,a0 kpjf.qir-+g mdpuired 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 hav8o4raho h84 l832k.xtp7we doi y)wuye the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, zoa9zcpz+t5 cd:0 ap(r.ze 0bthe 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 a)dapj o.a17fbw3y:-1zmbn ocn AC power supply. In this circuit, the current bmocp)aj:f1w-z.a dy1on3b7

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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 circue 26o )rv0.ekrfuvo:h it changes by what factor when the frequency is tri.fuhev0 6o ro2v)ker:pled?

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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 induc/6 db.f jazdx f:rvd93 t(cc+ztive reactance of 6+vfz bcdt.9rdjz a(xdcf3 /: that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor cv(nmsm etm19+ 0jxb. approaches zero, the inductive reactance of that coil0+tc1.mmsxmb( jn e9v

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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 cir93 x8e*eukvbf/uy( m 8 re4fdjcuit, the currentr*8j ux4f 9 ybf/dv3keeuem(8

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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 w ix+7hnrh w,g-cwgv :+hat factor when the frequency is trxhv-:w ging+7 ,rh+cwipled?

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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 zzm2gs2ckzd p* inda-v (v-9 j(ero, the capacitive reactance of that capacitoamci(n z-p*vd-2sjz gkv(d29r

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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 and capacitor in /ly(xw;ipp,s 9nw+2oo q-pata RLC series circowyso n9/pa tqw p-l2pi+,;(xuit?

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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 9i7wzmdt87tfsn/+pn zs c9fz7 f9er9 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 circuit. The impedance of the circuit increases if2tuh8o m qd wh;a2yxzs0 t2,3w R increases. When is this st wyt ,; awo3 2sd2hmq8tx0zu2hatement 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 incre9 odrximyygxb. ,;3t/wv61z eases 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 increi. p045j zkovlases 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 circu 2ms *t d7num5drs4vh5it, the resonant frequenct d27 drs ms4m*5uh5nvy 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. At resonancemkva4ejiue51 2p,-bd wk)g6 z,

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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 RL;s3qot+y;x.6 +yrzeyu0vj 5 gl+qaudC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0. u;atrg)o8;slb.ms or. d64xl10 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 ;lsd ao4rul.o6rx8;)gmt .bs 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 rotatinm caq6qo:9wdu9yy3e; t(0v7t g wo3tjg in a uniform magnetic field of 0.20 T. Findyw73:yd99ovt gc qtw ame03t; q6( oju the magnetic 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 w2 0bzh :r:pjn;pq3xa 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 the magnetic field vec : q;2xab:zwn0pp3j rhtor 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 adjustabvtfp/ow:o aq ze67 x450gr dea+ jb+m-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 fr q-rlrj1.fgzx q bbdr;0 dp-x).my q8,om $4.0 \times 10^{-5} \; Wb$ 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 18 d.k,bw1z n 61lmoberh)g l: 7acm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find thb:ma b e1rn1okl6gz)dh .w,7l e 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 wirr/ek 05 .4wbiq-daic/( vrwd se with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arh1vrg5pw508h if uaee*h p5b ,ea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where tu ei h 9 vj 1z6q-)frc3k)otcnzo86n ygx45y;dhe downward comp g34qc1 cohx;z ykt-i9n )j6d fozu5e8 )y6nrvonent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates asi7 )p)dokkh7tl va :*t a constant angular velocity of 2.0 rad/s about a vertical axis through one s7kl iv*d)ak7 ot:hp) of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and avx6)vkp 0p.h p;xket+u/vuu h-g, uq0v qj+x( 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 consists4/q+ moll6nvw 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 $emf$.

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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 /6ohvimk 1k8)4yiumxw y g( x(cm long and 8 cm widi8m((xgi 1yy 6 hwx/uokkm v)4e. 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 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 1007o/ 1b)dui tpm 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 wqp5dn571+ibh) s ypalh j;dp +ith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area o hp;dl1 7dpay+bnhs55)qp+ijf 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 maximumn2ao pkv27ruxl6lw2wy; +g s8-(o a.ney idd: $emf$ 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 resiszqf- y8)2sxb7 wld fh-tance 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 res-nzlid,c(x5 6s,emexkj r:h/ te 52fl w5 ;lbhistance of 6.00 W. The motor operates on 120 V AC, and when running at full tr -5e;,w(i,/xde2h 5f6jhxl zlmb:klse5 c nspeed 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 agxhll0g k-l( ) 24-V power supply. The operating current is 1.0 A. What)hl 0x-g klgl( 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 irl9yqzfc g75 0s connected to a 24-V power supply. The operating current is 1.0 A at full speqyc7 0z 59grlfed. 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 iat v-r3/( gvzes connected to a 24-V power supply. The operating current is 1.0 A at full speed. What ist r(z3 gv/ave- 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 pritrb2 2e7jb *xbqw9nm6mary 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 ihe,sk j7kb +5kn the secondary. How many turns are in the secondary k,k 5skje7+bh?

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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 1;l hx8x:0wrg qns;yy rf0mx+910-V primary if the 24-V secondayns qw lx0:gx8r ; rhm;y0+x9fry 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 5009ee4dv i:cn6 c-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the c:ecn i46d9cv eurrent 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 transforme(4sg:gx uhp lp2i 7t4;v8sg ihr. Assuming 100% efficiency, how many amps at 24 V can i:v78 u(lg; s4gi4 hx ph2sgptflow 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-xl9wu(gx9tkap 29st provides 7500 V at 10.0 mA. The primaux( 9tlg2k9ta p9x- wsry coil operates on 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 on its primary coil and 300 ture2jp(iqk8v eyl i))5a4ly ))9 gyrillns on its secondary coil. I l)ki4qyy)jvge 58 y ire2ll p)()a9ilf 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns o51ct(-c bluno;l b;wl n its primary coil and 300 turns on its secondary -cob;n5ct 1u ;( bwlllcoil. If 120 V at 2.0 A is applied to the 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 seco/k +zr1hs iv fb:*chk 5i1yc+yndary has 200 turns. If the input current at the prizyi /1vi1yc5kkfh br: ++*hs cmary is 100 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 secondaryj8t*l9chey,4 b zpy*a has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of jbl*ca,e4 yz9yh8 tp*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 s5f9((qylw+l ogi ;lbgx0t3 yz econdary has 200 turns. If the power input to the pri3(y ;gfi y0w9(llox+b ztq5 glmary 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 V. The voltage is usually sm7csd1uppv6 2q3jj6ztepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 tur cj2d6s6zp17qump3v j ns.

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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 usually stepped uua cigsfjv3c gwa.d4d)58k( 0 p to 4500 V by a transformer and transm).djda5swg uc gif a3c v(04k8itted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 t.q oz. x 8.q*eeww*bkg93qkp 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 transmission line if the voltage is not steppedwg .w .*z.o9tqkqq*k b 3epx8e up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 0 )4d7zmeltymW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linym0 l7m4)e tzde, 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 km lono32o/9xgqf2gxny;mq 2k xh b s*:w;vig has a total resistance of 0.60 W. A generator produces 1/ s23gxx wvi:nohmq ogqxy2*2;b ;f9k00 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 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 dowe/crza; 8t4c; v)b tmkn a 6-W line at 1000 V. How much less power would be los ;e )vtc;tab8rkc mz/4t if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 io/46 2zks,o yg n:fyl4wj7u eV at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the orig 2u, j4/y7 ek:o6w i4yglsfzoninal 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. yqq kft-u/x,dv4pu r76,j m)x How much energy is stored in the coil's tdx/64)k, xfuyvpjmu,qq -7r 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 conta 8 xno-6exk2t/gq wir1ins a 6.0-W resistor and an 18-H inductor. What is this1oe-t/giwx82nq xkr 6 circuit'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 0v88tw)lalaj circuit 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 the peak curreq (7si-pplou1 ,w blm,nt?

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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- asx /wnay9)a a 120-V AC outlet. What is the resistance of the la9)saynxw/ -aa mp?

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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 ismcbl9uotr; 2 cdk yi k1nh ;u4j4ge;hw+9(+rn the peak current through the resis yi;wuk4;rno+1grch+b ueh lj 4;m (299ndt cktor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t9u 3geu sur/z2he power dissipated in te 9g3zu2ur su/he 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 resistu f9c yx*h3lqkv78 ;cp4atdi2 or is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor igzoo8/ qpi hc(.vl kx*kwb18 tgx);*d s $I = 0.80 \sin (240 t)$. 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 awki 59*ow zo8x rt*u b-nq3+smxhl95a 50-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 a 1aw/t cbzi*upmu-; ,fkvg4:+p .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 apx)y+/ km7w4h+xzm fn 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 14.0 W of i ul zakwq*i +qm )0tr.r/eh5,d*n ou/.u8vbjhnductive 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 qe9t g 2/)b7a6 gdrgbkr2*cku 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 fret p7j;g5m rla+q3fxp+quency of 20 kHz is applier7q5 3j+tag;pmx+p fld 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 ti t53mbx 5n:0lsw/mrttk l c9/o 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 reactance of a 4.7-mF c-l1 hq+bput)et p,ike0o2sd -apacitor 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 g5 r(o7x67it*-wrvrkni*f4azgir 0a 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 capacito,hw mlp(ow:xigm; h1.r 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 capacit43laqj0m aae4ive reactance of a 0.010-mF capacitor be 100 W?4 j34 qal0maae

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz abnwc wp1)b):qi08 x vend 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 12.0vk v )t6 d;a9,zld)+zm *sbvyh W resistance, 15.0 W indv )d;d*lavt,k smvz6b9 )hyz +uctive reactance, 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 if a 100-W resistor, 20-mH coil, and 1.l( jvuouo6 x1:/o hlp40-mF capacitor are connected in 1ol:vl/xjh(oou6pu 4series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, anc*ssw7j)e* vod 1.0-mF capae c*w7vojss) *citor 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,z+s*. mrt*l cq what is the impedance at 1000l*c+sq.* rmt z Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wuj /spahj7 6mx8panj bm9x)4 ;hat is the phase angle at 18 h 7xaumj46sjnjpmpxb)9 ; /a000 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 witd;cpo-9yzz 7mh a 20-mH coil and 1.0-mF capacid-9cympo ;7 zztor for a total impedance of 100 W 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 l/ 1qm rfo;;wsseries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20fwl / s;1omqr;00 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 at 5000 Hz afzw f+qazl76o,t7q. for a total impedance of 4000za wal7q.qt o+ ff76,z0 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 putt1oo s bhxdw-lr646a;jre z 49 in series with a 100-kW resistor at 1.0-MHz for a total impeh66 oo -l1a ;bt49jrdxszr4e wdance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. W9.raknv w)) p1wkiibi/ fu ;z/hat is the impedance k).ni/iib9/wkzuv )1 fwpar;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 capacito qdpxaf7c.cfu+x se0i :h6x5: +,joq ar at 1.0 kHz for a total impedance of 4 6jai +,:hx5fxc7qxo:q +pcf.se0da u5 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 serieiwl vc xr:*(*ns with a 10-mF capacitor at 1.0 kHz for a phase angli (v* w:n*xclre 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 1plnot( lrc m 4ogd5((,uv::urql3d e(.0 kHz for a total impedance gr:lc4no, 3uq(l((5 d:lt( udrvmo ep 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 with a 100-mF capacitor at 120 Hz. What is enrjq-2v16 ps7)x daoxn98kt the phase angle?)va np71rxek-sx6 9oqntj 28d

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows atd.*v(z r3n. xe 1vlzw*p6at kw 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capazenr *pwl.kx.w63( v za*d1v tcitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-1cg/wezn n 3yws 8fsw/ /4bu*aW resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in/wa3 nws/8g1* yucf4 bse w/zn 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 reactance 30 W, and ankm2eq8q.s(i4vucor x/8d 2sv inductor of inductive reactance 30 W arv./u (sxki88qe2vdcm q2 s4ore 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 RLC circuit containing a 50-W resis td zs/i-.tqwf45vny+(x d* pstor, a 10-mF capacitor, and a 0.45tp45wq *zsv+d.-/ tnxyd f si(-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 resistorkg u 9yiy :f.d8-v)hpik ap hjw6(c1y( for a phase angle op8(h)-6 ij kwg pkfaciy .1:h9vd(uyyf $40^{\circ}$ 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 = 2002b pdhrx-rg 9f3:rp+r21 cmnt-mH, C = 10.0 mF. At what frequency should the circuit be driven in orpn 3rgcb2rx1-rdr p+h9m t :f2der 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 seriel8c oht(,rv( ds circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sup(h(o8vt ldrc,ply?

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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 circuitv8hz j, rr-aod)r *th) 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 imph )wl3n8m ,khledance of 60 W and a resistance of 30 W. What is the nlwh )hl m,k83power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W 1bs)bbx6sz s rd 7s:8lresistor, a 10-mF capacitor, and a 0.45-H inlbx1 bd )6zbs8sr:s7 sductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant freque5xyer (u1h / ;0ktvhqo4rx q.qncy of a 1.0-mF capacitor and a 15-mH coil in series?q otr(u5/h ;yv.0 qqhkxe1r4x

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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 se05w 98a,8euve ywfac1i-cm c uries with a 4.7-mF capacitor for a resonant frequency of 10 iuawvw9, a 051-ufc8cy ce8emkHz?

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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 fof3 p3f dtiu/ia:*s6e ar a resonant frequency otf/pe33u:id6 is *faaf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and c3av g/c5vavfyp(oe7n lp ;3v786 ezha 40-mH coil if the resonant frequency of t a8vc eeanvlpy ; v776c (3ogz/5v3hfphe circuit is to be 1000 Hz?

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