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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 excevdo j( kw/n/mc:3yte2 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 indujq ,kow7 o74izction 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 zz961,6 x pif5aisgexy. f:hzof wire in a coil produces what kind of change on the induxgzf y .i5 :6azh1z6pxe9sfi,ced $emf$, 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 o,hel,g80+0*wt , jg wdqhrmkaf wire produces what kind of change on tht* w0+rj,gqhglk a8 wmd,0 e,he 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;ilrc vk:+8 sp kind of change on the induced;svp: lcrik +8 $emf$, 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 t3b. pqw8q;m aa magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduct5o ;doi) a7j fv apt6b;g:/lmnor will be that which tends to produce which of ) pf:aom/5aj; 6gl7o tb;di vnthe 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 *cba s6sk6 :y)mz,3vzzcdz t, magnet is held above its center with its nok6z stz6v:z)3cb,cydz a,*m srth 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 horizontal table. A bar magnet 36 +pem e-gyslis held above its center with its north pole poin6eme-ygs 3+l pting down, and released. 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)n sobqjr09seb+wdt9xp/ ( *l region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field d(wsbjp99 )le 0q*/br+n stxofades?

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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 magnetic k9u )o3qg6lwc l my+-vtgi 9mr54sd )bfield 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 th6mvq5)klc itu 4 s+)3 gdol9-brwg9yme 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 horizonte00/iktoxme +hn+ x(le8wv v a)t- ka9al table top in a region where the magnetic field points straight down. The magnetic field disappears sa(08kl vex+wnee t0k a9 ohm-x+v) t/iuddenly. 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 and carries a q0l7bmg 1etxw6u-4v yn ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, mugt4-1 e6 x7blw0qvythe 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 jftsaa* lntt b*51y9(f;d 3ko of wire with the north pole entering first. As the noo 1y(3*;* ks naft59ad tljftbrth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abowb 1 ni6:j-bfxut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thw6bfb- xji:n 1e 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 co ui0fm6st+ch5h e/,ovxg,ae/nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced gut/evofx5 +s/ 6ch,h,imae 0 $emf$ 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.3wn1h0r m j9hdmaile,kf;9 vnd9 +9gj
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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 .4hd,veb4q1k inkfhg 9e z:3 o$emf$ 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 magnod2/hs59+zcn h xf) deetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nor1 vtt+.ysdil o w3*+ts mlp07gthward at constant velocity through a magnetic fieldvp3 *tll mgw+tt1 iy os.0+ds7 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 rotta3, v (r1/ojj kkmg9bates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transq2dwoj ii8l;y n (sm 2utk2gz-c9zw 6(forms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate4c)h1y :a;e 77 zip8fuzbd vbds through 60 revolutions each second. The frequency of teu;ya7dd7f)z 8z1 bivb pch: 4he $emf$ 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 t nnfz4wgb .;k30fo7r ko

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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 deviyfubdy 2nq)0hc,*8 (kgw)z zvce 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 secd gs8zldin):fvjf :aw y6 019xondary coil contains more loops than the primary coil then is91li0): f njddy6wazf v: xg8t is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loopp/qnz teo 8+ :n7h ed:xbz9p-is than the secondary coil8: bz/pdih xn- op79et+q n:ze 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 powerg r/z vq2-k7yk 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 cihi 7(7 +h i/*upojpqfwrcuit,

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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 of constd8y u6w h m1s 9zi*ydupn26g;mant terminal voltage. At the moment contact is made with the batp9 md w8* gy;umdh1zi66nyu2stery, 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.6l *mf6ffce o uyx04g to an ideal battery of constant terminal voltage. At t*y gl40f fu6cm e.ofx6he moment contact is made with 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 is connechv li2drb.f a1g8 a0w9ted 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 w ve)x1o +sr p2(rnas mn-eh88iith 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 series to a bame aa 4su77 -xarg9+rcoc7;w dttery. The time constant for the circuisu77;rad7rm4w aoc-cg9+ ex at 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 inductosb99 i n,bo 9agccmo6 . a(,5mgmycw6sr are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current9,(9aocb9 nsgc sa cyb.mm56g6m w ,oi 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 followingm:l5 .f61x eh6ssty kg have 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 8x9zew p0/teaa2ar j++a35n wfe(f* kbf. yceAC 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 AC power supply. In this circuit,1y+ny0ee/rz e the current yy1reee0+ zn/

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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 b2 vqw3/; jft927h r s.lhemdpdy what factor when the frequency is triphw7;v9d2/2e3 lsfp tdqm.r jhled?

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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 oas,k cd gl p:zxcq4;s j300j.r9o-uyAC voltage across an inductor is doubled, the inductive reactance odpcs0 .yl4 rzc ou-;k:0g sjj3aq,x9 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 inductor appro3c./vjgn2o9bnl krz8 aches zero, the inductive reactance .grc3l2jnnzv/ko9b 8 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 pbpsb39 )mr4waglg: l )ower supply. In this circuit, the currenlw)3bpmsg:g 9)l4 rabt

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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 whh(a7tp 4g5 :ia4frmxvat factor when the frequencamh 7: fvx 4r(5gtipa4y is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC ;2 xxi- q 3ls(it)6bfb5;rgj 2oh k(hoyzszo5voltage across a capacitor approaches zero, the capacitive reactanceq((;fl js2 3 hg5r;6xtiz2k zoybb h)six-oo5 of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitou10fmxx4 z+lq/+w jx 8czcx-br in a RLC seriesq/mb zxc0-x+f8x+jz c 1lux w4 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 is j 0l2ciu h64hx el;d2ndefined 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.; 9/ rmm,(rqvou(etlk The impedance of the circuit increases if R increases.q;( ev/rk,umrm (o9tl When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impec6n cochr *n(u nwd/+r/ b(+wtdance 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 impedance iwm/t9i6 x/sffpp+uf3v ;+zv 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 doublehi+wvgz ux6** czt 6f9t) xpp+ in an LRC series circuit, the resonant freq+* 6ch9x)uppxz+6*fwgi vt ztuency 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.- * fgeygqu(o an AC 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 serieody+(l v ujbmqh7/. gz2-phcf k1/(hf s RLC 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 *dntq)h3dt910 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flu thndu3)*9t dqx through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneticcgb h9sp1h3m / field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicu3pshbh9c m/ 1glar.

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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 radpjxi q0+j/gc:*g4 e bvius 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 and4* bicg/x:gvej0p q j+ the 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 y-j,qvt)mc 3vis 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 chaqiwv ;c 6eoo. rr)s,cgeh9 i0;.tq3donges 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 18 cm. A ;r) n gr/*4jcyijvr:2c sg(fcuniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0*rrg 2r/)gicj ;jc 4 y:cfn(vs.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 7jn(6 bnp.m xpu 6yzh6area 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 hf0lr0hr q (cz df u1r/6yq-+k s34zecarea $0.20 \; m^{2}$ 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 adey5 h4fftyqd .:95bhorizontally at a location where the downbdf:t5f.yday 9e4hq5ward component 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 a m3x;xg9adv0v bd e +bz3qp;v*t a constant angular velocity of 2.0 rad/s abovebp+gmd ;3xa9xvb*vzdq; 0 3ut a vertical axis 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 lok6 ymp+*(-hlsthuc- ,ua r8 pjops 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 gp 2qn.rb0p ug0(( is4j gzh-rof 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 loopvn7pz w *)w8zgc*f +ks is 12 cm long and 8 cm wide. The armature rotates at 12k)*z v*z nws7cpgf+8 w00 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnswn* sy(et7 .th 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 a* a*/fopjt7p 3xq iby0n output of 12 V maximum when rotate joiy *qp/xfp*at7b03d at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mac/g 5 zls5f+ykximum $emf$ 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 resistandrs)r dn7+l5y ce 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 6.*a+lh,6b n0*y )zin nswsr odk4g74pr00 W. The motor operates on 120 Vsl,rdap*h4gzik7on 0 y +)n4bn s*w6r AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-dxkswo2 hit4 23i*rl4 V power supply. Thet 224*r4ixsho 3ld iwk operating 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 resistance 6.0 W is connectepyapcd t2*ui-b/p 6f 7d to a 24-V power supply. The-pyt pca 2/6ubp* idf7 operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply3sz rxpp 9*.gi. The operating current is 1.0 A at full speed. W3 .*zp spg9ixrhat is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed cii.8+j blb8et(we *fvo6b0 rto 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 primary of f7. * x9exn1.3m(poew8 g8jkkdp f mgna transformer causes 14 A to flow in the seconda89fx*nk 8.ge 3(xn.gedkjppmo7m wf1ry. 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 a 110-V primary+wk0fa o 7pfns 043fla if the 24-V seconda+pwn3l0s7a0of fk 4fary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2o7+q -r vj:p+ukhghn 4000-turn secondary coil. If the current in the secondary is 3.0 A, what is jvq -4ghr7oknup:h ++ the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficienp4ip, crnt7oh ,j )fu*cy, how many amps at 24 V can*i or,)pp4f tj7 h,ucn 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 sig p1rh0 )-28yjm xad/6r benpxkn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whamer p 6phxjk0bad2r ) 8yn/1x-t 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 gi31d g(jwdtnx 3yt;3h 8ke+gprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaryk gj (etn;x3t+ i3hgywdd38g 1, 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 primabhqocfx+ s. q:h0e (qtd( a))ury coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tt0():h qfa) b(hdx.scqo+uqe o 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 200 turns. If/:7d ws:kr6ekqg )fa8yp qb5e the input current at the primary is 100 A, we 5ke68dg rfwaykq/7:)s peb :qcan 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 turn+* rjpkck.oa; s and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bea.r*kkp+ j;c o

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 ;gf*h sos 1tvpsnz9ny+12l+ oturns. If the powen9oopns1 s*1g +h2sl vf t;+yzr input to the primary 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. Thev:/,. pndxy- d)enjztt9 qo5 y 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 . zdnxt t)yq-nd,/o:vjp9 y e5the 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 volt6*ez3 q uukr/nage is usually stepped up to 4500 V by a transformer and transmitted through a poweq /r*eu3u k6nzr 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. To lg;n,twly v)fgq7 vd7u nzt9l2107 the voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fqy o)9l g7vw7 l;207 zudf1tnttvl,gn ind 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 lonx ; ,wrdp;-f;d;u ijmrg 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 would be lost if the transformer were not used wriu;;; j -d;mrfx,pd?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistancixfo;8q7*) /d-my unts( hscb e 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-s( t nm8/i)ydx b;hfcuqs*o7 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 muchn(y be2okjrvsry, e/1 (ry(d8 less power would be lost if the power were transmitted at 3000 V inste(edyrnvk 1/,b82 e (rjy (soyrad 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 ise5 hak+ + hu,,6tggplu 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generatout,h kl +g 5uehga+,6pr 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 ene4ts:t5+ akr ahxde(xlhh n:4 ;rgy is stored in the coil's mxnd la hk::4h;e + art5h4ts(xagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Whatm79hk)z7 w ojj is this circuit's time constkmw7jjoh7z)9 ant?

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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 ACxhyy6bjlln0p b 7 8 32fni j(pp0.eidc8d:x.j 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 th28ywylpa7 a9kq zn/. ze 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 a 120-V Al +xzx 1xgt5u.u,gv o*+oafm7C outlet. What is the resistance of the lav t7mf+.z o5a,xx*lo g1x+uugmp?

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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.sl2bqd u0+k0 i d .mk;5chyk3l6glch is the peak current through yk0lc6ic;ghh3 b0l+m k2k dsl5.dq .uthe 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 co(/w5 j,lfkv2f-tqdq*e0 nr crnnected to a 120-V ac power supply. What is the power dissip,f /n lc5qrdjvk*2-r(ewtfq0ated 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-Wc0oepzd9)0 ;3 8dkp0* dgs n:iueca qa resistor 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 re7gjno6yc k 3 mh+h+u.xqix 7k-- ta1rgy0pjw(sistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isn;jfd0fwx+8w.e 6+7dlwt1w nqyf bo0 $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.um avic: :,;t.ppple*zg(f /n0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50uu 56zz.ecc/ b*/ wmrg-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.v(xbj46)-c(gevm s1ix .k9fnnr+a k y0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of induhw; r+xqwl80+,h9 9f nlojwht ctive 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 frequency of 20 kHz ia wfqhyf ; fd/ fr83mtyifd.wj+g3-) (s appy;ywfrg(3t dd 3f8)qfj.f f+ -/a wmihlied 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, 0hvp 9w ,pv(3d. lxnx:apa/rj60.0 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 ren0-vsw51rxw oactance 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 l4 f175jt;hur4 )j sun vvvv3oreactance 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 do vf+ i;;l sik0bsd;3cges a 10-mF capacitor 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 capacitive reactance of a 0.010.e( 4mxg dm,qzzt.+d i-mF capacitor be 100 W,gm .emzqt+4z i(.xdd ?

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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 and 5.0wks* jm0, e;psczo;n ; 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:dx url,o8gd* circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancu8 ro:,dg*d xle?

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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 1 5dccj0 :5zvrk* 7mssm bi;.ug00-W resistor, 20-mH coil, and 1.0-mF capacitor are connectjr5s;ccsmz 5 g:dv i.ubk 7m*0ed 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 a 6r;oj;h1x lhwt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c; l;rhxo whj16apacitor 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 20kwb82nv(2 yoduwk ftp434 2os-mH inductor, what is the impedancenwy4ks k oo28db2(tw4 3u2pfv 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 201u uph(.l3f)yxa+t irp4c61j1yk sfg -mH inductor, what is the phase angle at 11k4ucg63 rp+sa y1 ul fpi1.hyx()tjf000 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 seriesc0p6e 48u0ecv 3d4bokjr9, mqrbspd6 circuit with a 20-mH coil and 1.0-mF capacitor fore4 8mp0dbo6ck6, 93 sb4qeprcjur0d v 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 series with a 100-W resistor ant sed(xaedld+m74 74r.abx 5td 15-mH coil t4s 5(dxad.e rm +atlbde4t7x7o get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz ia 1g t8s7ox4rfor a total imptx o7 gia418sredance 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 fk ju7h /n10v s q0nu/la;9lkbin series with a 100-kW resistor at 1.0-MHz for a to/ ;va0 kunfl7/bqsnl10ku 9jhtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF clr 01.decff:l afr sskc/1h: 4apacitor. What is the impedance at 100:l:d0hfes aflksr1/c . 4r1cf0 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 caka:y qhl 8wpz6q p-vf( 5eozux.,0rj;pacitor at 1.0 kHz for a total impedance of 45 ; k (:v.,zl -qxauf0p6qj8zw5 er hpyoW?

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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 seew l,t0o9 ;*nwtxeu: eries with a 10-mF capacitor at 1.0 kHz for a phase a0tlu wte*; xne:9ewo ,ngle 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 resiskdji+ z5;vi d-tor at 1.0 kHz for a total impedanc5iv-dk i;zdj+ e of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series wit;85 uqp +2(t kpaofgfkh a 100-mF capacitor at 120 Hz. What is the phase anglpf2 au(gfq;k+k5 8opt e?

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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, a, q2gust.8l +zx 4bkivu87lunnd 1.0-mF capacisu l vlqbik8z, t u7.nug+8x24tor 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 capacitor, and a gy yq+er 1(f/rilf;,(7pt c bi0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply.i( ,q 17lrc fyb/y(;g+fti per What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacnv)1p 7yu e *- bxten:a+g7pmmitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power)g+n1e -:yn *u7vmbtmpx7a pe 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 anglv/f8a 7iho /u75yatgjpm3s/giw gb +5 e for a series RLC circuit containing a 50-W resistor, a 1a tio/b7pv5yg5h gm3/a/ uj ig+sf7w 80-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series4d 5jdzc+l 1fv with a 500-W resistor for a phase angle o41jv ldfc5dz+f $40^{\circ}$ 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, L0kxl9bdq)ga cu)6.7 0by hnm a = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power t qy6a0x0l 7a9m)dh u)bgk.ncbransferred 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 wit)/ms 4e u wty5(d9horeh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the ywmu)htode/ sre 4(9 5circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an kvt0kgt5e0w 7 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 impedce syn ,di9g+-ov4 1lbance of 60 W and a resistance of 30 W. What is the gcobnle- i1+4yd,v9spower 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 R, w 4gddpylb,zn+v9q-jo;0 jcLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a ozgb4 qvp,n,j ;d-y9c0 j+ldw 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 3 .nx/n5tlrcu-mF capacitor and a 15-mH coil in series?xunc/lrn3 . 5t

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series wi9csu69v6 ol l v;hkby /g89msiq0tjk+m8u.ty th a 4.7-mF capacitor for a resonant frequency of 10 kHygqslu +986/msv hmb68;l kcvity .u kjo90t9z?

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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 sere7g/co1 c i q0ngnzgn7y)x.j84yn6a cies with a 3.7-mH inductor for a resonant frequency of 1000 Hz?yyc)71gn8oa6/ n740xqj gn c.zcigen

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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 seo-*zfg ozax/. ries with a 30-W resistor and a 40-mH coil if the resonant frequency ogf.zo a*z /-oxf the circuit is to be 1000 Hz?

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