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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 mag*hef84yopfau*q .d8g netic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thatsqz;m hajr l7f8x3 )m7 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 )e7yyv/*sep:5a 8dvi uorra /in a coil produces what kind of change on th asv rre)uy/:yp/7ve *5ao8i de 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 through a low b,; i3b0v i jyqh0bjs.+2jknop of wire produces what kiy qhwb+b2jk;ij.,vsbj n0 30 ind 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 a loop o v j-s)waou17jf wire produces what kind of change on the induceso j1-)juw7a vd $emf$, 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 mag m+toup17 ukq,netic 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 a f)i /j.tl vw*a/gnn3l 7nku,in induced current in a conductor willu3l/7gif) ,j*va kw/lt.in nn be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil liesuk 9s4mnbi4xbq/2zb8 flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromz iq ukbbxn2sm9b/448 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 h6f31vy fa2u9jr u3q ngg* 0mec.fj+n sxan4 .xorizontal table. A bar magnet is held above its center with its nonveam3+14f3j6 0xfs*q c n.u agn y.g2fux9jr rth pole pointing 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 region where the magnetic field v)3 vd7xp klwp;ector points straight up. The magnetic field vanishes sudwv3d7p p) ;xlkdenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic xbme1lt) .s+fx 4,nit field vector poi .bfit1, )ms tl+xe4xnnts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field 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 ho8 lbegep,6 +ty/8bp:y ;xxbgf rizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction+;b8y8eg b6 /,blye :txxpfpg 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)yxqur fgp16g*5yc9v n ever-increasing current northward. Two coils of wire lifx1qgpy ) 69*cy5gvr ue 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 withsk))rh g:;ryrs . bzi2 the north pole entering first. As the norgk.s r;b r2y)his:)zrth 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 constanth3qfas8 h230;mcz c hdhn)p49n dh-h e 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 ifqnmh f 0-9dhhcedpc n3h z)h;s 2ah348 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 roze+(xrm63zah*s1pyrnj0n403 b ql y ytated at constant angular speed about an axis whose direction can be varied. In a region whexyamesyyzjr(n+bhr0qp zl0 1 3 43n6*re a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.n jgt3+n03;uebf1 zd j
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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 a+ g0.,bthtkejkob*0 en $emf$ 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(n7 x9 6v2zp*f8myiqtb+de3f.lo lrc. 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 northwardx s5mv u 2gxi/m30.adn0+kupr at constant velocity through a magnetic field thxirsxd.u0+0/mu k2v 5gmpa3 nat points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anguvaozxh0t w, :aaw b i*d7-5pl b;t68yjlar 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 tl:r+go.to6)c/x j ygq ransforms

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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 eachur d )da4)ja0map o5cv7 qdn3/ second. The frequency of theud/n 7 a3 po5j)dcq0am)v4rad $emf$ 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 usedt4 jgxhldb 3 6yd/k hie),z)3r to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that3 t26: amqvsgqi(e5 pe

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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 prim:i-h z*(xntoge( 2hns4y w q0dary coil then it(woniyxg -e 0 h qdts24:hz(n* 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 containskpp 1 -7g+iuefr:b6vm more loops than the secondary coil bfmepr7v-6ipug k+ 1:then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp ;:vv)hgtc(oe 3og+-yre9 cqjut

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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 circuit,14gbd t -q:dkf

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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 arl83c cig;tq u7m4yia.e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volt7i;t uc8c4.gmi3a qlyage 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)r j,qyqi a;,,pwa8wq in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ),,; iyqwjwq raqap,8across 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 connec/i6be7 f7sryf 1*d rzfted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and r9iku- )cs u9 rei,leg4esistance 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 battery. The t)5.j 0hknt)jsxm7 lb1buxi (bime constant for the circuit represents the time requibtbmxn57bkuhjxjl s. i(0) 1) red for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Te* w(4efy3a)j9)oql j inel7g he battery is suddenly removed from the ci*j lne l43yqw97) )aojg ei(efrcuit. 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 havf 1s nehj9i.;u)pmco9e 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 ho0*q: ilih4c.*j .hmq hevp)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 supptht, gr0ngb n-h;7g,wly. In this circuit, the curren0nnht,h;w rgg7 b g,-tt

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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 ob2,b2.t yxjp by what factor when the frequenj b,oxtbyp2 .2cy 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 xz,v /d8u,+aip 6afu 8e*np egthe AC voltage across an inductor is doubled, the inductive reactance of that inductord, an6z8x gpap, 8* uvu/fi+ee

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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 volta of 3v2dyem /nwz/ zd3oj8ya11ge across an inductor approaches zero, the inductive reactance ofa 3j /o1ye/dzf8 3o2 1yzndvwm 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 fzmyc qn(:gxgc9ww42, :ufm -to an AC power supply. In this circuit, the curren:x-f2mcg ,q:zyuc mww g4f9(nt

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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 hldj.xtbw/jat/cn ( a m)/,2ncircuit changes by what factor when the frequency is tripled?ac2mw.dt,nj)h (a/ bn l /xjt/

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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 voltagek/ yp o5)x8ejw across a capacitor approaches zero, the capacitive k)/wpe85 xy ojreactance 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 mfhp75g-h ehbqg9)v :sb5* e wvoltages of the inductor and capacitor in a RLC e5pg 5qw7 hv-*9 bs):hhgemfbseries 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 tj3b 8h l h*sn6d4lwq 7gw7+tu5md4eldefined 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 circuo 4h4vpkl n rra..)6q i8aazj/it increases if R increases. r)nv8o/h aj46ail zq r4ak..pWhen 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. /dy5zusz +y 0gk-hx -.f8bxuu The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance 75 e6huffdbna0ke 2-c1zegp5of 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 do sfsn 59u rst10t ru4-hf2oxx3uble in an LRC series circuit, the resonant freq sr0ff1 so45t2hxn9-ux ru3stuency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC appliveg mz* stk083ed 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 oc )elmipyl8e.ipz3)a1 ;s9tib curs 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 gbzp58xx hx)6ba q4-f0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wfxqb-p5 4 x6)bg az8xhhen 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 u2;,uuzawvx rt37 7ntm)rp)ge) w z+uin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet, )mgr ;uxuwtpzw )2+ez7av)u3utrn7 ic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m , 32 .huga*6ctomhcyh is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arey. hu,ocah*mt ch36 2g 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 are,p q 7a gablx 9/epgyi36.u29.efetpca of an adjustable 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 chang;; -myhsie) q5w: zbnfes 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 1tyy: r5uf6jn5 8 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unr nt5ufy65jy:iformly 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 anduntmv,k 2m/+w 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 and7 wtu,y;lr. qn 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 horizontg3hbcm.gujdkh 19w,k8p 2ys+ ally at a location where the downward component of the Eartc 2wdg+p3 s8ukmh, j9hyg1b.k h'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 rotatqdwxk,0 :k1q ;l qmvo-es at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while m0vkok q1 dq-,;lq w:xin 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 loop gx isp i ,,+)n5ofx/blljpq5/s and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire lm0hzw.9lqr6 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 1q.rdqhgq c ,(z: /k,vsh:4 wnn2 cm 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 magnetic fieldqnvs/, h4hn.gk:qczq (:dw , r 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 consists0:suujc2qv otb75j q) of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generg 2zfzl/v9xt ,ator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of th2, 9f z/lzvgtxe 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 m z n d29rha+i54:n8xt l;+dxl3jcwzfgaximum $emf$ 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 6.00 W. The motor operates onk- toqu5usqr1 v9iv)- $120 \; V$ 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.x:tfxkpl 1j 6 resistance of 6.00 W. The motor operates on 120 V AC1k6tx.xl:f p j, 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 24py-zvcb1jfzbk .wv2 ;j n 2;1h-V power supply. The operating current is 1.0 A. Wha.nb zpvj-c;b; kjfhy12v 21zwt 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 connected to a 24-V power supply.a7jm;:5 4jt9s urmlwf The operating current is 1.0asj59rlwtm u j4:f 7m; 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 connecttbu6b,cp trv6y 5)c l0uze))oed to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacvb))cruup,l byzt5)6 0ec to6k $emf$ 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 reducbk8/gwm l4vu yd1t 3,we 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 caujdx7s4pfx dr zr j9 g*8;r;;amses 14 A to flow in the secondary. How many turns are in the se;j a;d*g9;dx7sxr jr48 rfzpmcondary?

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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 oy9p* u itep:u)j1it) turns are necessary in a 110-V primary if the 24-V secondary has 100 turnsoi )i )pu:e tu*pjt91y?

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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 2000-turn secondary coi/+ q qqzq pbo jp/nq 64),3iara/am2iel. If the current in the secondary is 3.0 A, what is the current in/aqa4qijmzb) , r pqnae/ 623q oqp+/i 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. Asst j0 b f/qm*alhk57+uquming 100% efficiency, how many amps at 24 V can flow in the 5qhmb70*/ jqkf+atu lsecondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Then)d8b9qoxhxfz 2viz ie u99: 0 primary8z)9efobix z09i uxvh q:2d n9 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 coi en5dpn7rb 8 gm 5-mqsqei*x.:l and 300 turns on its secondary coil. If 120 V at 2.0 A is apprp- x 8:55embgq.ns nm*qd7i elied 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 turns on its sec7k ,jt ks06rh-3 jytnsyv4qen++ rxt)ondary coil. If 120 V at 2.0 A is applied to the primary, what current is pres+k7h+ v,3r)st06 t4yntqnx j -sey krjent 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. I.50y l jlk,ew7 nb8obgf the inpuoegn lk yl. bj8w,b507t current at 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 transx, u4kj ib3pd/xbc -n*former has 100 turns and its secondary has 200 turns. If the input voltage to bn4c *b,xxj/- kp3idu the primary 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 traia*n)pxv rc;2nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary;x2nr v*)paic 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 cu20qe+raz 2saixf 6;w qrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary hwsf2eqr ai0 q;6azx2+as 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuav,piotbimrq/ h np+j (8sjv86p 77o*mlly stepped up to 4500 V by a transformer and transmitted through a power line of tott+6 pr*vsjj8,m mp(ooqpib7vh7n/i 8 al 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 oybzx7 (k-1vjhf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pzkyv 1 -(jb7hxower 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 ks g54tvzjs0.zyv- .j s3bips,m 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 would be lost if the transformer were not u..iyzvs5 jsjgv4 -t sp,b3z0s sed?

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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 ge7bzhh 7bkzq(nz 5 -qz1nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped uzbkzn 7zqz-(15h hb7q p 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 ,rd)f 0txhz ag5bc,d8 )(xml;.egjzd a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 dzg rlbm,g x,z5ed );a(.0h8)jt cxdfV 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 ipj.; 6 weujl/blb * t79ry9fgns to be transmitted on a line with resistance of79pfe/lljy t ru;* wjbb.69 gn 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of p1db ha4k/w 2zip 2r1i5.0 A. How much energy is stored in the coil's magnetic fiel 212ibp/r zadwihk14 pd?

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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 azfl -z5roif-6 6.0-W resistor and an 18-H inductor. What is this 5f-z-lz6ifr o circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an 9t4 z .fo+au d)*uqragAC 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- fv*)y2ih3x 0a ruvfq 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 outlet2qf weomc09,oe bpax*6 s-/es. What is the resistance of the lam2xfo 0bs6 ecpmq/sw9a ,eo *-ep?

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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 connectenyl mhd6n:2 )nd to a 120-V ac power supply. What is the peak current through tdn y)h 2lnnm6:he 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 the pk;4s h9mxgh o3+y*n,y hf 2adpower dissipated in the resistoroh h*, dn+xp9fga3;m4yh2s ky ?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through kbhi 8z gh ul98qaq97+a 50-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 c432twx 1khspbxt, p 0resistor 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-/ocp,nvf:s ,d l /g*prW 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 os(*yxn: hb1qz f 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 reactano+qur1w1wm i5t1hdc:7 i 2rd zce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 Wimi,h ty,4s6ten 6,k n 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 za/qdj*)+fne s.ufy3of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a l/;v4myfhz7jo a h25ffrequency of 20 kHz is applied to h2vlfo 7;jzya5mfh/4 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 2.50i cm5w g;j8rar:/fkg1fcr6fahk);j3 -mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ckifjqjzdfrla x1 h h,0 xm hjck0774f 5w09*v/apacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitq(w0frt :eyu-ive 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 c y5vpwz. :*vuiapacitor 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-mF capa u79/dc3 zvh,6ncc iukcitor be 100 W /nhk7 u9cv,iczuc 3d6?

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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 capacitorxi pk4:cb0hs/ wkk,*q at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W inm w3gz 0+oevt9gm/3vaductive reactance, and 10.0 W capacitiz e3gv gamvmt3w0+/o9ve 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 sl2pkv fqplk;cp(e,lm/ 946v100-W resistor, 20-mH coil, and 1.0-mF p6k /l pf,kp4v;e 9s2m q(vcllcapacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c+c mwz9/ccj v/oil, and 1.0-mF capacitor acmj z/c /w+9vcre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH +s/ rz4rpf jiw,* )xthinductor, what is the impedance xt,)*rwji r4shp+ z/f 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 wucq-+wyt+opdk +1;o;ci6k v20-mH inductor, what is the phase ang1wqo+pyto6 w-kv; uc ;++di ckle 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 ne ;mvlq3wws h+ 6ev .f7equw.1geded in a series circuit with a 20-mH coil and 1.0-mF capacitor forsw q+v;3l6feg7v.uwqh 1em. w 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 followingio 33 wq (pu6d)/lkt0w:oltcf capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedancetq 3kpwfo0lcl/()wodt3 i :u6 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 for s:c4qbv9 rdzl 8b j.;da tocq4:b.dv;zjrs ld8 9 btal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resiur9r))mo5jx 0r0* 6jf c aavnhstor at 1.0-MHz for a total impedaca0*a rjrjh) r)5f9 mxv06on unce 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*c )cj b+/t8g zxhm7d7v2s jjj 20-mF capacitor. What is the impedance +m7t2s*vjcgzj /h c87j) jxdbat 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 tot7fl.)xftku auq j:ki,- ;nxq2ey89 om al impedance of 45m2:- fl7xojx ak ,k9q) tf;y.q uu8nie W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a ple+lb; 1(94wrnrs d skcax +m7hase angler bmr9++ e(7clskadnwx;l41 s of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f0i+1/, tz(s m +avq/cyk dxki 86wcotoor a total mvoaicc kt d swyxq+/o/ 6i0(,t 81+zkimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wv:pf. 9k kjxgh f-3x/nhat is the phase angle?gxvp /.f x3kh kjn9:f-

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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 tbh5j*ce9/ j ecoil, and 1.0-mF capacitor are connjb/*c5 9ehtje ected 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 cgy g,)6mm+//l) ycq6wteyxl) ) cwcabapacitor, and a 0.350-H g acc,yxel gl6)m6)wwt by )cm+ yq//)inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 28dp5e l8e0ifoy c/n-xz+agb dcx8+vW, and an inductor of inductive reacta 85 e lefxd8iga xdvyb/c+z8+-c2n 0opnce 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 resistor, a)z; +qjzf+uhc ( +mwun 10-mFfzn+;u huqmc w(j)+ +z 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 series with a 500-7lb zdz4v-4eeam+ bn( W resistor for a phase angle o7b +b4 lv-d eemnzaz4(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 hasxz/hq. nei01 vpmla32bl 2 9ce3wmeq/ R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven inleqp3x/1 .9 emqe2cma3/hl n 02vw ibz order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancekxdp* .:s/)+ sn1hbiu ni lyv m9v.sgd;r c03u, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power dc:xg .;puu 0nnsil+.s)sh3dv y mkv1br9 */i 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 o5(j1fno nhrgyn(6; w $63^{\circ}$. 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 rfzz9 sac e abc43xv0xt0cs7 b9svs491esistance of 30 W. What is the power factor93 9z tvf0x40cv acbcbaex ss79s14sz?

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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 factb:g te5f.cyveim;c9 k23o x8lor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6x8vc :mtgk.ecf2 ;5obeli3y90-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 capacitor and a 15-mH coil in dekitevj o xql9iyz54z-;37c /21 jrmseries?ixj -7zk3jlvm z ;e/t2edyqo4 r c15i9

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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 i* ha;l)e *wetglkc(/v7j tk-nn series with a 4.7-mF capacitor for a resonant frequev);*w ek- ncak lj/7l*g(tthency 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 needed in series zxmemigu h .uyq6j cx6+ :+f2+with a 3.7-mH inductor for a resonant frequency ofu2 c+6hz+ qy.+gmuxe6:ifjm x 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W res/ x 91y:rnari (clfn6histor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Ha/c h1f:lyin(x69 r nrz?

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