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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 magnetic flux exce vj 2o/rm;rpr+pt

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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 inductiv p q ca.pke1yx/d1/-6:5tss1jk yuheon 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 coilj v3gip qaqa5f4(l0 h+cqi j 1miw,/n+ produces what kind of change on the4/qj ,aq( mifv 3 gw1+qj05chii+a lpn induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field thk 559 cllcaf7krough a loop of wire produces what kind 7al lck5 k9cf5of 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 of wire7zw smu wkf. e;e+ncz2r rn7*0 produces what kind of change on the induccr.nfzw+0w7r nsz7ukm 2e* e;ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetilm0r 4fuixmxdz:c+;;z;5 yz 4nomr9 mc 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 conductlg2ax2 gm1+ o+avwc /.t9bxbg6hyy j(or will be that which tends to produce which of the followin+yma w 1t.2/9gayb+vgoc2(hb xg xl6jg 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 one1jxr56qcxi cf5nm4s:t 9z2q a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magx926qm q:45zrexic1j 5 c snftnet 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 o:5 ajg*8 wziyin a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches thea:wzgij 8i*y5 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 pojy438)bk9u qdh7d:0d :e5qwy0 jn ccaid az0bints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the s yded0 )bnj5 70kucyw:ib3q0d9 8ajh zc:aq4d ense 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 le,f5wf)* )b:u nu udka3bok0qivel table 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 the induced current in di3 fbokun5)*) au:0wk fb, quthis coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magneti:zgg0sc/jlacyr 29x1h +vs)1t t* dw hc field points straight down. The magnetic field disappears suddenly. When viewed from abovevgc1zh*2+lwax 91t shjr :st0/cyd)g, 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 and:f +nb4*dvvi c2: jspzu :cr5n carries an ever-increasing current northward. Two coils of wirb4:s:rfn+ v:2 5vzij*nccd pu e lie flat on the table, 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 nortqqqs4i x2mf56s9c ry4 h pole entering first. As the north pole enters the wire, them44q29rqy 5qfxcss6 i induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at c( htq.fuhvw8wm9o: ggo;mt ( :onstant angular speed about an axis whose direction can be vv(gg( wqtmth.fo 8o m:u9;: wharied. 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 zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a6 /.soindg0qr xis 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 ofg/.ndri q6s0o 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.uhwom9 8l)(yh
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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 dft )vv-)*tvt$emf$ 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 magneti3cnq9dr6qc l6 c 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 ea5h /8vgqf)w bsst-west direction) is moved northward at constant velocity through a magnetic field that poingv/ sf)bh85qw ts 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 constant angulars ,o/: p6qguj2waoc*w6lha9g 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 tranky afl/bcv2 e(j 9*.vx-p7z ursforms

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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 of ll)qxd 24qc *tmau.(wthe q l(cw4 qt *l2xa.dmu)$emf$ 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 devin3js1c u jj-n;ce 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 devizq)ob- 4sh1akce 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 loops than the q+ e799xigxdsprimary coil then it is agdsqx7+ 9 i9ex

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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 cupeb+*5f 9fnmontains more loops than the secondary coil then it i*nuff9b e5m+ps 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 powad )o6p 6:wek6xe9a : /krwrqcer 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 circuit3i k34cuvl3sm ,

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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 anc dbjn7jn.zb d96s37f/s f ,zn ideal battery of constant terminal voltage. At the momszbfjfn 93dz77 .cb6sn,nj d /ent contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connec v 55qpc;4*p1icf b4kl ce5bewkc+vg4ted in series to an ideal battery of constant terminal voltage. At the moment contact is made lp+vp5kkb4e b5*4i f;c5 w 4qgce1ccvwith the battery, the 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 resistance R v;e2k m/b3(em loq;czis 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 witht s01wvpx mg0yzs un yy9+: om/5lzy;6 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 inductor are connected in su (p iv1sq:(lberies to a battery. The time constant for th (qip1b v:sl(ue circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are con y-a4sser;x 2qoa9 80sdlas8vnected in series to a battery. The battery is suddenly removed from the circuit. The time ;o- asrlsax sedy0a8q24 s 98vconstant 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 same units except+9anz0e tr5 gfgd3q cqh,/lgz-:f,a y:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectex8wypco 64hy 9d to 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 connected to an A ;bt c.xgu9f wx*0qa 3uuqsj0+C power supply. In this circuit, the currengx b3s0j*ux;q a u.w9fcqt0u+t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanco dfl8vq;vs0e8 3d7dve in an ac circuit changes by what factor when the frequency s3vldqov8;708 f dved is 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 induc,;d7evbbbt9,) ozp kltive reactance of thatlkbp7o , ,zv d;)tb9be inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches ze ,cct l ho(*aoou0-/th t*tua,ro, the inductivtcat*ut*hha0,o (loc/o t, -ue 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 power supply. In this circuit, jh4ba jof)w/i p2,wf 4the currentowif4, wpfjb4h)j a 2/

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanczot6 df51f+ d,05sg skm8wcdre in an ac circuit changes by what factor when the frequency is tripled?kdfd s 8 wo6 cg10,5ztm+5rfsd

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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 approachef elmwhle9zw:6m 7k-4 gas .v2s zero, the capacitive reactance of that capacitg7:ml.e629 esfl - wh4 zwvkmaor

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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 im+cnzvqw-7d7 nductor and capacitor in a RLC series circuit?+vnqwzm7-d7 c

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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 is defined as *y**sobra h: z$\cos M = R/Z$, 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 cxmx h udk+::w2ircuit increases if R increases. When is this statement true?u:+:2w xkmdxh

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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 circ- 62r bhnqpwrxtt )a9-*zn ps6uit 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 impedance of the circuit increase0r-42j k*pdaz8dx cpds 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, the f sf8h4 6r5*i.avsno0jeg3pdresone pgvrjn6350sh sod *a4fi8 f.ant 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 Ala6+ j p9p9q1cg2xwf2my c qg6C applied 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 whee0;qk6.w ps8ivea; p pn

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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 radiud( 7uxj jkh4/+/ dyjlks 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 magneticldj( hjk/4x+7y duj/k field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field50urcw;nn (8 txbci6n of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecnnb;0r(8 cxnt6 wc5 uitor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2hp y-6r.lgu0g tp 8)dsd-g(dg0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic -gh)u.- tg(8p 0dgd6g lysprdfield 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 isqu sigb l k9 0l2um-)k -p3ght19f,7gjkjvy1q 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 fb (k;nu6upaqf0)et*h po*mb .rom $4.0 \times 10^{-5} \; Wb$ 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 wirka0 8fu( tubq)lr712jh1f j, 0lmq1vfm3yiqge on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fqj1hb0al mi 70,qq)j1 vf(u3urm8fyt2fkg1 lrom 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 /;yp7vixwkbvqa *s5.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 aemmd/t:fup 8v9eo4 y( df2i 8area $0.20 \; m^{2}$ 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 *-x9 e :rlfv,g0vo)b/eiu9mkujpi w, horizontally at a location where the downward component of the Earth's magnetic fb oxg9vv,im:peje iruu-,w /l9f k)*0ield 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 u-d5 hu cxvnsp j3bl11x/0qc0at a constant angular velocity of 2.0 rad/s about a vertical axisjus1q5v l3/x0dh-uncx bp0c1 through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional are*bp2cj ( (imysa 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 i w6;j: d3tewtw8t amlrq39x*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 2,e/ptwog/x 5s do w*kcm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform ma*w/oo5ep/ gt 2kd, sxwgnetic 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 o,gi (uike2s+0x rgdy )gqd.rb sf 8,uut2-:fof 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 t huzae ahji;7 yp2n.30o construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availabh; eyu nahj20pa.zi73 le. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genwn1 8qc k)iwr ti(:muj88 4b(mr)upiq erator 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 have a resistance 5tqwm nf;s3;w,zp iv7of 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 6.00 W(lm;i7bf t0dd. The motor operates on 120 V AC, and when ru ;t l70dfm(bdinning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Tgiq e z u.(4qkv2g11ce,p.jag he operatj qqag eg4i1zp.,1vk(.2guceing 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 resiyxe3( x,1v4qqbj x bi5yyzp10stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 311p jbe xvxqi5zx0 y,(yq4b y$emf$ 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 to a 24-V power )l oyk -*yzfn2supply. The operating current is 1.0 A at full speed. What is the bznyf*o l-yk )2ack $emf$ 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 prim ew0 umdz ,mo u:ueukxa c+,hki(q)2,7ary 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 -:kah6qm bhs5 causes 14 A to flow in the secondhh5k6:mb -sqa ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in axmq 1ax+w*vzq58 nv f9 110-V primary if the 24-V secondary has 100q+qna vx9w*mf8 1zxv5 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 20bk k9v*dlf; -m00-turn secondary coil. If the current in the secondary is 3.0 A, what is the k9bl *mf;dkv- current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100%y yu/33 hv*0di)mjpqq efficiency, how many amps at 24 V can flow in the3ivyuqy)j /*mp 3 0qhd 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 nen6 19 5shkdxkwphft7(on sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. (k1x5p fw67h hkn d9tsWhat 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 8 e,3b:dyj )s0ky r7q mi1a8 irnn5khfand 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage)kikaf1 hinq :0msb8e rny, 85yd r37j 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 itsf0z jwqov 4 yk z2g*uw4k44r,g primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tu0* j4krqggz4vyf4 z w,k 2wo4o 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 secondary has 20avg- ;tt8wuv rts5* c)0 turns. If the input current at the primary is 100g8uv5t )avt;rs tw-* c 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 tu,blq *8s s6grbk,o0aarns and its secondary has 200 turns. If the input voltage to the primarbos q*k g86r aa0lb,,sy is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns an3,hm 1p7ogw/k(updzyd 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 be (nkh7o / wy(g 1d3pz,mupeglecting 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 :2q)ib avr; b rpr)v;0kbte3 nvoltage is usually stepped up to 4500 V by a transformer and transmitted through a powerq0pa)n3bbbrr )e tv: iv;r;2k line of total resistance 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 t)m i5g0 .6cx co5thpovoltage is usually stepped up to 4500 V by a transformer a60)5oi gpm.c txtcoh5nd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually-6ssq/ lcwl(-pn2dc x stepped up to 4500cc q-xn(2/ dll wp-ss6 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 total resistance of 0.60 W. A gk6 tpn2 u b2q/hh7 qsk*8p6xo 3skree5enerator 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 trans7h*8 6bs utoqke2pn2kqer3p 5k/xh s6former 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 2bwqny0urieoi3 n ;2v79mq+sm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfousn072 i2y ew3o;9nr qi+ vqmbrmer 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 powe(/+3o58iv/jpx2pnkkpbo* tfyu yw a 3r would be lost if the power were trx/ uvooj( ybt /kn*5k3 p+ pf3a8yiw2pansmitted 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 V at 20 A. It is to be transmitted on a lq ng3r7im lgoc1 do/23ine 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 0.01cgqgio/3 23rn7mo ld1 0% 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 currentjxz q ;qtvxy lx-de2*(as-3 (n of 5.0 A. How much energy is stored in the coil's mal* 2d;(n a3-jes- z(q xqtyxxvgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and ;o4e e 1mwis9h(gtfn5an 18-H inductor. What is this circuit's m 5 eh 1;g94nst(ofwietime 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 :9a j)u5c(em1p+o3nl i jio7apw /cmmAC 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 currenf lvmop+8 3bedxy zl8p,m8tg: syd046t?

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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 0.cx-gyygd .mck4z; z outlet. What is the resistance of the lazky m-gx;z.c. ydg 04cmp?

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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 -w:lsc/.yyid p g3lvk ,h.f, c)qheg2 current through the resiw2d: gq,f hsl..v y p) -ki/ycec3lg,hstor?

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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 the power diss8sluumk1kd dltxvs+(c/ag j 95/9 8lsmq 4w: bipa +j/48:asm b5(w tu8d9sdkcxlksv g1lmq /u9lted in the 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 rem9so-uky2 3q psistor 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 re6hrh h pp4 w8*wy,wrf1sistor 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 50asfjf-zyty 6q avr+q 0v34*l 0-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 6:i cex2icg6hh-l vx9 of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of cvogdx i 9.s55a 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 inductih7,f84pc cf gwfvzm ) i1xtv/+ve 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 inducti.a gdct pk4.5a+f2izl ve 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 td47,:f6kkffl b r p/ya 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied 4fk,dpbf ltyk:f /r76to 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/ ;)9 ty wvg2zcxt+kk bkppk/4, 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 capacitor at e mi3u*:a/sje 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 . *- ymrkg u5sxodvk5850 W of capacitive 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 capacitor have a reactance of 1200 Wder .2dikrt5w/bfl 4xvm lq+73t3 bc:8m2dyg ?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacit sa0 9zz*nqorq 212zedor be 100 W? qez9sn21oqd z2raz 0*

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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 t-cdw ql /fla.:hrough a 0.0010-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 i40z lg*ygy.lac series circuit with 12.0 W resistance, 15.0 W inductiygl*lz.gi0 y 4ve 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 Hdg+dq bho65or +mtgkbna u3e:*5 n2 .uz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are condoben. tu5ohd 2kngbm:+* +5q r6 uag3nected 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 150b*p(/esv+i x u0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connesb uevix* /+(pcted 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 co nx45wovnc8n9 nnected in series with a 20-mH inductor, what is the impedanovx8 n9cw4n5 nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what i() 50d.fdr4 vz,ow nz83doynr fq4vvls the phase nf3d40dvdq)(yrf o5w .v z4,onlv8zr angle at 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 w+*syzdl ,tdo6 ith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W ,y 6ost+dlz*dat 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 wgqi8t );g.q pxz *zdy0ith a 100-W resistor and 15-mH coil to get a total impedance of 110 W gg*z8 y;0q)dxzi p.t qat 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 at 5000c- om38dv)*t(pcriuud/ ay:j Hz for a total impedance of -duvoida( rtc*y ) 3ucj8pm:/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-kouc/r8iei: cb *.x; v59mwxrjW resistor at 1.0-MHz for a total impedance of 1biv* 9. cr5x:;c jm /xowi8rue50 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 connec x.d)dpz 3w2jxted in series with a 20-mF capacitor. What is the impedance at 12wdz )3xpj .dx000 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 c9 l x:n/2 nn.rfrt9gzqapacitor at 1.0 kHz for a total impedance :nqxr 9 gr./nnf2l tz9of 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 n jlk+wc)**8kuoig ,hu eeded in series with a 10-mF capacitor at 1.0 kHz for a phase anklij+h,)k*uo c8 u*wggle 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 y;l2g e2r wcrubh 3.*aresistor at 1.0 kHz for a total impedance of 45 W3r2yucr w.aleg2 ;h*b?

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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. Wh 13u5jfv p;j2cld jh016iqun zat is the phasejh u6pcnv ju31j 1dl5 2;zfiq0 angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.x)r 6 4w 4dmadcp8a3mm0d8m)d36xwmca4p4r a m-mF capacitor 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-W resistor, a 10.0-mF c: akx8ypcp8t1 apacitor, 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 circuic 1 y:p8tpkax8t?

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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, af uoh 8,o 5iklx0h,ca62dwbn 4 capacitor of capacitive reactance 30 W, and an inductor of il wo02af6u8ho,x, bc4hn5idknductive 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 RLC circuit containing a 50-W rs 1zbds1 b,4.c qrmp:8cdadj2esistor, a 10-mF capacitor, and a 0.45-H a1mbcp:2dss48j b ,rqc1zd .d 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 neck+k u+jg+.bm yn4yb -dessary in series with a 500-W resistor for a phase angle of 4d. j+-+bbukkg myyn+$40^{\circ}$ 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, inx1f).tt pplj6r r3-L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from 1nj-xti3.tpr pfr l6)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 xfnkn nb:) j1;with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectedjknnxb:1f); n 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 c6m;jjr44g5ymj e4y/ n ;qo ydvircuit 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 resistanpvi*0kr 2v8nb;t2z9jl rzp6i ce of 30 W. What is i 29z6rn2p jlbz tvipv0*;8kr the power 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 resistor,:a-/7- ryman+vyjc-y+ bdj 5 bqbbi2d a 1 da+b qay-i5j b/-d:yybj2 +rc-mbv7n0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacito0jlfh0t hk1ub)n*)p jpg )/cc r and a 15-mH coil in series?j l*c0)ft )10bh /g)nhpcupkj

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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 oukoeb6bc)k t3b( 1gn;u v;v8 in series with a 4.7-mF capacitor for a resonant frequencye; )bcb 18k 6vgo(v nuk3buo;t 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 go)v m, 1hclcu9 6h3j4cxx6fx*e3tl wneeded in series with a 3.7-mH inductor for a resonant frequency of 1000 Hz ccvu6exxm) ,hwx149tj63 l coglfh* 3?

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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 s)eln 2oa*x;5: xfh1piwli2 tz* z0 keyeries with a 30-W resistor and a 40-mH coil if the resonant frequencpiz exok)t2xh 5;e:wy*a f*10l znl i2y of the circuit is to be 1000 Hz?

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