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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux e; g(wk3s(zk(bvm /trhzao ( e/xcept

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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 thesddsm.f; 1 4j;,tyrx picp); f $emf$ 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 producz)zk4e/y )zaw es what kind of change on the induze/kz)4) ywazced $emf$, 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 of wire produces whax(fa gr.x7+irywk+)b txg+rrb+w. 7axy() fk i kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of k1 uwl 1o6k: r/l7tjydoo*tg4a loop of wire produces what kind of change on the induceyw o6l *k7dj 4o1utk:gor lt/1d $emf$, 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 magnet84z(z .h v oir(hjt+ecic 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 3q+-k76a t tpis0svf uze )9hthwd;h/ an induced current in a conductor will be that which tends to produce which of the follod 06uh )zt39iw t7av+qsthke p sfh/-;wing 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 magnet is held above ieixfq8 m be;2t25x, vwts center with its north pole pointing down. The stationary magnet induces (when viewed from a2wm;bxef5 2e, x 8vtqibove)

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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 h7md -e88p6vscu6c iw a horizontal table. A bar magnet is held above its center with its north pole pointing down, 7s6miph cev8 u-w 86cdand 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 regio3jg hlds+r 5luk8 ,g*ln where the magnetic field vector points straight upurlg8* gl35jdk+ l,h s. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on j)3sz3ynea 9x a level 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 curree3nzs j93)ya xnt 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 r ;kkpn)qj 8d1top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disp)k dn;r8j1qkappears?

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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 an ever p3ll )csp7 mjz50/kqt/c 0dgj-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the indukp0jm7l s/ c0tpd)zg/5l cj3 qced 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 elkgi; mdf:g821w b hii4ph6:of wire with the north pole entering first. As thp:gd iebi8 2hi1lm6 h;g:4kf we north 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 wir(+r gxp c++;bt8blkcj2v4 s zje is rotated at constant angular speed about an axis whose direction can;v + j+sz xc4b+c(8prg2 kljtb 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 $emf$ 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 angulafnq+u e)qo5 g;,5 buifr speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientat+uo 5g ;qbefu5q),fn iion 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.+okz -mn,vr, q
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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 tv dn n0j4xc)4t l/0qqbhat 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. jccg 45; tt7vvpfs*ye4w m kt7/a3h (wThe $emf$ 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 3zksp5t7b; 95yudvn xyvj-xc -71ci ggykj). east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make aig7duvz - 95t7ync.b5)yg k 1c 3 jpkvx-syjx; 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 rotad :+xuiy* x)rqtes 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 tr wy*w73p sid7hus)wbpqin s 6;(lg 1b,ansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates thx ixe;6-l/0 3tevsh -xhcvg+c rough 60 revolutions each second. The frequency of thxc xi-g 6 -x+lvs;he0he t/cv3e $emf$ 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 xrpcaxc4 2d 3rst+:cz+ 4fxc5used 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 devices+. useoe6a qj)h fgu4)r;di / 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 mor 1hyhstyykf a18pjrn0h0v 0tca5 td(yg4+0 ;oe loops than the primary coil then itj0 00ky1yv0t1ph yd ot;5+t8haca r (hfs4gny 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 loops thand0fwvqxk4axw4 de9z4 z,7sco e /n w;mkl97p( the secondary coil then it is 4kv;zxwso/daq7me7 pzdw fe(w cnx, k l940 49a

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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 poweg 2d/8zo: 0k -glf damzuth21nr 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 ciioe m/ jnr a35og6m5j-c ks16frcuit,

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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 sc b6rfl -9o 9,wk*whzperies to an ideal battery of constant terminal voltage. At the moment contact is made with the batterrl9cbw*w - z6o9f,khp y, 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 seri f+ d.loi),b0f7iuyn fes to an ideal battery of constant terminal fn ufi7yfo)di 0l+,.bvoltage. At the 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 inducta+p 2s7 v5eyws:qx-j jmnce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductancf ji ka,+e6 w-+9jltuve 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 serieso8p 4 ( ptutntncy-iiwuiw2i0sm6(0 0 to a battery. The time constant for the circuu0nc0n(0w i(os -i2tw itimuyp46tp 8it 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 s puxtj).5ezwc ui zsx;0h8; ,to a battery. The battery is suddenly removed from the cce w;zxjx8ss z5t, u;)pihu.0ircuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following havw hrbj3z* m4 4h4tsaz/e 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 v2ztkn,wgrs3 jih/3( 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 AC power supply. dbuh5/ezli+x i-j 7f-fwz8 s-In this circuit, the currentufj/wed7x5hiiz+b8 s l-z-f-

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when thkdxu-6 .n zr4f8zvr 3un- jv4je frequency is tri83dzrnj 4-kr-.z u nf4j v6vxupled?

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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 volta7/5o9pyoehgmn ub szm7 ay:r*wn +p; (ge across an inductor is doubled, the inductive reactance of te7 (wp:5+ anhg m/nz;rmu79ob*pyos yhat 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 acrosvaznyiqxn b / oced:389y w*f:77tom*s an inductor approaches zero, the inductiv7va7xzbnm*c n : t 8:9d/3oy*oqewyife 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 powe,ea ,o;ay 2sfjfb* fx,r supply. In this circuit, the currentxffeb, ,,afas2o ;yj *

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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 what factor when the*b),d/ bu c/t4gi ppbs frequency / ,*picu)pgbb/4bdts 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 voltage acrhb +7 hz(v-(q gq/xdcdoss a capacitor approaches zero, the capacitivz hghvd+7d(x-b(c qq /e reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages oh j +l9poo prti-y0r*5f the inductor and capacitor in a yrlj 5p-+rh* o otp09iRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circjgt 6ppv4nx2+ (aj/fhtde3 3 buit 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 increasepxjo )ri0764vghqsm) s if R increases. When is this statement mi h0)jxv) gp6ors q47true?

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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 incra,hwrni1 /tr3+l i9zveases 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 ino+j3u)kmwbz sse4wa)r +.b.1m ds2wmcreases 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 spud zl7g-*2wseries circuit, the resonant frequency of that circuit willp-7 w*ds lzg2u

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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 resomooft fw7z3g .: ma+sd7*s-2g. l iwiinance,

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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 w- 83t5-5jup,ccyu dwub4mcrf hen

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneyj,g3 go*a*0msm l1fa 8ty3mmtic field of 0.20 T. Find the magnetic flux through the loop when the plane of th8y*mmtga ml3a , 3sfyog0j m1*e 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 magnetic field of 0.20;jw6i22o(fe hw7qd2 qnp 4bdvusmm ( 4 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pe4 jwu q27 msp6fm q42ow2e(hvd(bn di;rpendicular.

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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 rotatin7somo5mgy p(/x)i a:jvh ,t6 pg in a uniform magnetic field of 0.20 T. Find the magnetic flux through t:xp,avh yio6)/m 7 5psotmg(jhe loop when the plane of the loop and 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 adjustrntp i7z f5+t .6cdwq9able 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 5ykpi6aibb3 t23c j7h 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 ozn/+90uobu6r ) upqk in a square frame with sides 18 cm. A uniform magnetic fb n9ik06u q /rou+zu)pield 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 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 s)s1kwrz.dkglnfp fg453c 7( 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 anc0khqf (/m8ios ( srg5d area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where w9nn p7b6bd 9lkui,;o-8u vvothe downward componentu lb79,vn ;8dwn9 vbuo -i6opk 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.r-(bv in3hgbpyv4k 423yu0 wo 0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constavi34 v- b yk 2(3ng0yhuorwb4pnt 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-sec3 -rvlm h,i-ertional 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 consiskvkky6s g( v; x-bqi*+ts 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.k5idyumjg.so3 ,2wz3 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If th,gdz3ju2 5 3oiwk.sym e 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 turnsapjgek:ll) lku9 3cu549v0 up of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output ;csx/07ye6c13 upo n qvgwl(f of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is v06yu;3sw7 (lo/q npcg e1xc f$100 \; cm^{2}$, 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 genes) vy( 0p 3amh,nxrlv-rator 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 of 6.0) +tr8nnwe/bu2n5ca r0 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 resistan()ry 8o. tqgnhce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a back n h.)g q8y(rto$emf$ 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 6.05ssas7f*o b,vz 9zv)s W is connected to a 24-V power supply. The operating current is 1.0 A. What is ths7ov)zz*, f9s5a bs vse 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 connv ;5mg5mef q;pected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back q m5pv;me; 5gf$emf$ 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 supply3 x/n 1*d1lspkeapdz2d9 h 5,telb6m s. The operating current is 1.0 A at ful 1 x z sldp1nmd5a,k9pebet/*6l3hs d2l speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is.d0c v6xqwg,l needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flo w sd,n3qw334 asf/cqfw in the secondary. How many cw3qfd3s/3saqfw4, n 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 mant(au0i1 1rz ql:w+sm yy turns are necessary in a 110-V primary if the 24-V secondary has 1uqmwy 0s(at+ri1lz1: 00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consis +.3tseo zw3j (r:bt-9yau rtbts of a 500-turn primary coil and a 2000-turn secondary coilj3oeb+z-9b( ttw.rt :ra3suy . If the current in the secondary is 3.0 A, what is 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 3*lbi6t41iirhe (ob z 100% efficiency, how eri6 1b4zihblit3*(o many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transwx+g/,*7 rpyip;la6i:ah qa z former provides 7500 V at 10.0 mA. The primary7xi*zphiaa ,wy /pgr +l6a;:q 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 anvtqijj.p96k,a d0/e x d 300 turns on its secondary coil. If 120 V at 2.0 A is applqae.,kv jt/ 0 ijp96dxied 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 on its primary coil and 300 tu :k 2rdfo l9efw58mra.rns on its secondary coil. If 120 V at 2.0 A is applied to the pkla:2 ror m wef98.f5drimary, 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 transf rc*1 pwdc, q;/4ikpeeormer has 100 turns and its secondary has 200 turns. If the input current *qc4 reek i/, 1cpw;dpat the primary 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 secondary has 200 turnsmpd)p s7jks6 d+k+fr1 . If the input voltage to the primary is 100 V, we can expect the output voltage of the secondkpdrp )d6 +jk1 fs7m+sary 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 transformw38xzrb.osm; dglg; *q a)du-er has 100 turns and its secondary has 200 turns. If the power inputlqz*;3u; mrasdd8g.g b o)-xw 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. The voltage is usually sti ygzl2( 0qnu;epped up to 4500 V by a transformer and transmitted through a po;u zg(ni qyl20wer 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 voltages. d.x vc3jk-l 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 pk.s3-jlx. dc vower 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 steppa.s6ox 7:7 omzqtou z*ed up to 4500 V bxo*. 7mzou6o :z ta7sqy 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,guhn*vqk yw;:t h(r+. A generator produces 100 V at 70 A. In order to reduce en(k,y:* wqgt+hvnhu;rergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gq s b*-,fc*,nisi 5anj3:utzaenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of,afa*u -:i b5 qsns iznjt*,c3 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 down a 6-W line at 1000 V. How 1.x4 es ro1 b0kvht,agmuch less power would be lost if 4gv1 ak 0r1,xo.ehbstthe 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 V at 20 A. It is to be tr9p:ij:fd,m s5 *pvby uansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with :9s ,jvppi:u 5ymb*dfa transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in l0.u9l1dhf ye9l ;d ,vx+cxvfthe coil's magn;.xd yu ,l0ev cvlxd9+f h1fl9etic 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 containsx0 -w *aw*.p2sk5t7 qywi49qkuyatn y ux-y6s a 6.0-W resistor and an 18-H inductor. What is this circuit's time coktw 7 2qt-y su*-p5s6x94awkiyaw.q xyy *0 nunstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 Vv);xj b o:t .+pmycjk,?

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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 120mbqy.g3 b *)sxv za((r-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whyqii kkl0eg-9tc 4*vy77ue ;n3 rv( dtat is the resistance of the lami-7tvq 3irk cvtd 4g(0 9e*;key7 yunlp?

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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 toi..;ky vhs /xl a 120-V ac power supply. What is the peak current throxsvk;hl. i./yugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is tj8+s 1fqk yla5et9- gghe power dissipatedfty -g kjqe51 agl89s+ 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 j)qu77n -, a;zxfk9jaekz+ dh-W 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 resis/c9wr*n0z op*igrfz 2 )fve8otor 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 50-81io )fh 8qvhfW 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 1.f hk y9t52*151x-bra ezudi7gf gn;mjf:cct, 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 a 2.50-mH coil at 1000 qx e . .1m65fsikdqg/hHz?

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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- +sjjaum+6v g63sy wmz 6)wf,kmH 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 inductive reactancec)vx+ pl5y;slwvh(z ju/a w;ul:3nx8 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 inductorbop4f mq) z8e8 when 120 V AC at a frequency of 20 kHz is applizm epq8 fo48b)ed to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source?r5 *2(b c,9 nrcj0yhubm.et wp

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz?n (4w(r+qymz(qsxx* c9tf0u m

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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 havmns,hd9hv8 z8 a2-hfhe 50 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 hzqcqhxfm5 8whx9ob( -- 8 4vhmave 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-mF capacitos+eqm xs-21zvg9 cz/fr be 100 W?qv1 zxe 2/zf gc-s+9sm

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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 5.0 V kx5,adg 4v/uss ;:hc9uox fv3?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W in-fe 0/;t44 vewa ubaxzductive reactance, and 10.0 W capacitiveazwfauv-e xb4;/ t 40e 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 cnncu.2k : yr1qoil, and 1.0-mF capacitor are connected in ser21n.:kcyqrn uies?

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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-+v3hx l3qe2zj 4,dre n4)kl vzmH coil, and 1.0-mF capacitor are connected +4r)elqj3n3lk,z vz v xe2dh4in 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 pfn64w:8hsabn-ry -a series with a 20-mH inductor, what is the impedances n8pn-r-whab 6yf:a4 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 f+ g5aifwu.*l in series with a 20-mH inductor, what is the phag wl 5.a+fiu*fse 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 wiumiw zohy 3kx;+s4b69 th a 20-mH coil and 1.0-mF capacitor ywi k39zxm4s+6b; ou hfor 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 q :k zcip:lhb8l+ wtzxu+057f100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzbhu ck7l8zw lp: z+qf:i+t5 0x?

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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 4502e julr+0 75 ntws177tyc0cuhyh x (vl-mH inductor at 5000 Hz for a total impedance of cyue7hrjtu l 1t2xwsn0v0 c(7hl+y57 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 l+o)(7qjuluxvus:z k,i-a e2with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?ui: o,x alve-zusl u)2kj+7( q

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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. Whr2z)z2y rnn h7 ;0zqm.v wb*blat is the impedh ;y27nz*vzbzb wr0 2n). qmlrance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a to xir e5dvuvj 1-4 k076gw07r qxdlkem*taljkqwd7i v1 xm*x7u05 dv kg0e-r4le6r impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with 3wwi58cob+ abv k3.fo a 10-mF capacitor at 1.0 kHz for a phase angle of vobw33 5w.f ka 8c+boi$40^{\circ}$?

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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+stodt4/ 4m 5err nt(k series with a 30-W resistor at 1.0 kHz for a total tr4( et5sdtkrn+/ 4moimpedance 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-mslsnm7oyv4f ;d(zv * 9/5enopF capacitor at 120 Hz. What is the phase anep 9ny7d m;v(fv4lo5s *sz/nogle?

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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 w+gn(/-ylqx.pt1plv 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cavny lt1+x q- pgw.lp(/pacitor 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 r-,wucg d, vc,wesistor, 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 the circ,,,g uwwc-vd cuit?

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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 an inaa piwy7sqtc14(1r4s ductor ayw 4 1(1rqap7i4tsscof inductive 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 resyg(kyy8hah +, /f+zqjagsb 8 mt4i*i:istor, a 10-mF capacitor, and a 0.45-H inductor, wb(y/*g8hm azy+hs:i,f4qa8 t+y kg ij hen connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle mb4r9: vfiwi- owf9r-bmv: i4if $40^{\circ}$ 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 = 20.0t6ab0p,sf -pg W, L = 200-mH, C = 10.0 mF. At what frequency shot-p0 bgasp6f,uld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuq8q jogf( q+6j39ar rkit with 12.0 W resistance, 15.0 W inductive reactance, an3ofrqkqr 8+ 6ja(9jqg d 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is)fba+.qwn )wxg g97 xb $63^{\circ}$. 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 ao:v qr bl(xc+)w7rj2 jn impedance of 60 W and a resistance of 30 W. What is( obrx7:c+w jjq2vl r) 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,xl:2 + w6tnmab a 10-mF capacitor, and a 0.45-H inductor, wt+mwn al :bx62hen 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 frequen s;;ovac ry+0ucy of a 1.0-mF capacitor and a 15-mH coil in series? ruva+;yco;s0

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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 wi4xh5p 8og dgg9xfaryt 3.y(eue.1j4 m th a 4.7-mF capacitor for a resonant frequency of 10 kHx (ao 45 yg4fh381geu9x.j.mrpdegyt z?

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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 indu )4iswz7vz-xx32whxf ctor for a resonant frequencz f2wxx si3xw-v7)z 4hy of 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 30l/1ozgelr izx+3 z 27w- 2bhnsgveuw:1tc9q 6 -W resistor and a 40-mH coiu16gz el:2 eoxqrn2tg9wzh3/biv-1+7 zw l scl if the resonant frequency of the circuit is to be 1000 Hz?

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