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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 a i8 f/3v1 hqjyga*httvzs91ox) 54n0yc9s iakre units of magnetic 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 statb+b* q.yvn*7 r w- 6k,nifxzytes 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 o p uo (:sqe0+438 ,dkrk rvvyfmq.au9gf loops of wire in a coil produces what kind of change on the syu,d+v fpo 3 rqgk(0e9 .q4m:8vraukinduced $emf$, 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 ci:f a2j0wfkrh l+4;+hbenxwfz)-k9 loop of wire produces what kind ;90jh+:ncrhx kbfle2ff za)k +i4w- wof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wie3 u 6mg8u.voqk-p4uai4 3aaw:mb ;mvre produces what kind of change on the inducedaa3vv. gui e m8b;u :pwmk-um443 ao6q $emf$, 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 magnee4 -5 gg(ocrbj5:nh*qf:pfot tic 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 2sm( ayq5/ )afghp:*uti4rln a conductor will be that which tends to produce wla52hm)n(f q4t:rsup /gi ya*hich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a 7+47xft0shcojqm a 4 kw)kk,j34ushq horizontal table. A bar magnet is held above its center with its northtk f,4+a qx7 cuhsohm7wkkj 4s) q40j3 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 lies9l(e hx;bkc2 j flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches t;chje9b 2 lx(khe coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector 2)s(sab 6;xd*c5mpwj:vtfl j ; wgpm9points 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 fad2;9w(psb;m:jxw 5)m*djg p ta fs6vcles?

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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 field mxc;wx(s )ft+ vector points straight up. The magnetic field suddenly grows stronger. When viewed ( tx)sfcwm ;x+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 horizontal table top in a region where the magnetic field ayir:xh n*8 e9q6ij i51j.1mf loq p6opoints straightjelnyf oi oi8mh*q iax r91.5 p6:q1j6 down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and cfngv / .m-tb3farries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abg /.tbvnm -ff3ove, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entf ,6w+5 dws,ndfti b.zering first. As the north pole enters the wire, th+wt sd6dw5nf b.f,, zie 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 rotatedm1 (uf4s 27oqfigv ez+ at constant 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 thv41o iug qfm(s 2+ez7fe 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 a8x. 7ila53 f9nyrcjalo ;+ia- odd0zzngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w+3f89oj 0id xlalc.zn oa i-y5dr;az 7hat 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.q 6- ek6v.zmwfe yd65o
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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 axe, 49 th4m5*n,z. kn2peqwsgcly2h in $emf$ 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 magnl-g tq q8 bxh8k(*w5yzetic 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 move4r2e92xyfwkih jl4)(6 8 lbt ek6rflqd northward at constant velocity through a magnetic field that points straightk)rf tf2 be 4qjwxk yrl2el866(ih4 l9 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 angul i hgw/iy(+m- kkq+sb:ar 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 generatoah kti*4(gn.yb voy*gft :-z+r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The freque1l()saou enk0m 1kw 6lncy of taw6ku1 (e 0slnkom)l1he $emf$ 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 devxq;od.vk ;z6 u qqf6qd3 z7kqf9gp 19vice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devi3uuoeye6 2dw. ce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more lofi k+c:y,hb5co b64lrops than the primary coil thy:4krf c ohi5lb+b,c6en it 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 loopsty:oc c/+hy 9m than the secondary coil ht:m y/y9coc+ 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 pf t*hh,dk zd*r6l1bx (ower 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 resonan+7 z;p kkel(4( ljmfmvt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conne8)0w (mz2j9bjra9agqzm 4 cvi5 yjve. cted in series to an ideal battery of constant tevqbz2z40 .a(c 9m ig)m8wv jrje5 a9jyrminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal gy) tr061ckydbattery of constant terminal voltage. At the moment contact is made with the battery, thg)k 10rycd ty6e 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 connkv (vyjs44u d4aa( a0rected 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 res(bjkb bf3if 7)m:x b/bistance 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 induch.x.p7qtkp2 p tor are connected in series to a battery. The time constant for the circuit represexp2q. h.pk pt7nts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery is 3zpw-w b4p bb1qqs dq)c7ol6- suddenly removed from the circuit. The time constant for4q1-qbb op3p b6qz)-wldscw 7 of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sysxjym k8(( x vnyr,76 (wfk3uame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power suppg xay o(o/d+/yly. 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, the curq w/f9gqo0s8/xt 4am4:x qhgm rentx9mg44g// :aq 0q8xf sqmtwo h

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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 8 +0dqu1ttf ;*ngrwg.r0sfrr 7c ba )nac circuit changes by what factor when the frequency istt*gr17 )0q+ngfn r8r a 0.wdbf c;usr tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doun*vxr (27twxxxt8z lhd ;n*;sbled, the inductive reactance of that indu(* wvrd;x nl72xtszn8x* ;t hxctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zeranglfu*v(f + g, 5yc2lo, the inductive rea gl*2(ycluvf+,ngf5 actance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. 5ds l4ux .j5*h:ctcf jIn this circuit, the current j4*sulht5fc5x.c dj :

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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 circi oe-+m f8/yob39wjqu uit changes by what factor when the frequency i-f3emoyo9w ub+ iq /j8s 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 across a capacitor approaches zero, th;z(b zcjd,uuh6.ti a.e capacitive reactance of tha hz. dbu;ujc ziat.(6,t 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 thehwl4p,t*n j b* voltages of the inductor and capacitor in a RLC seb,tnh* 4w j*plries 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 pe;zt gkomrs5.l;3 y: .6tawa an RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incre i2vr/h.05sg6pf de rrv74makases. When is this statemen .gda4ep7 r0smr6hvrvi5 f/k 2t true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increa8exiomt:c 7 o,ses 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 thik gn(a8dsmxu2h* ;x1e 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 capacitanc9:s wdr:lgz 5vnai* .84owkyhe both double in an LRC series circuit, the resonant frequency of that c :y89hil. :vd go4wrw *szn5kaircuit 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 applt dy9gja;l:8 zied 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 circuwva 1v(d)ef i3hz; c6cit 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 0.0:p0xbh-, .kt xi+vp(v hp3mv8y mm vg10 m is rotating in a uniform magnetic field of 0.20 T. Fph+-pm ygkph0tvivm3b v0, v8xm(.x:ind the magnetic flux 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 rrfoqdk,z5 ius d0i) -(e.:mv 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnekm5.vf:qizoi rer),d ud (- s0tic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i:wq6cu8 j :cvln a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane l:jv6 q8w:ucc 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 adjustable single loop is reduced fl hmvy.e/g yj6;6x4oq rom $1.0 \; m^{2}$ 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 7;qs0 yi1xv zgchanges 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 side)dv ien8 5)ofis 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unif)5 f8vd niio)eormly 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 turzbk dfo q gp*278fb; t4 g(-0tlrbsw0hns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area -d kd ma)pv9g:$0.20 \; m^{2}$ 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 locatioy b:5d f 6i57mr9xwqhrn where the downward componen7x r6: iqy5fmdrb9h5wt 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 at a c mrz 1v)(ahgq1gy8v:* f bs6oponstant angular velocity of 2.0 rad/s about a vertf):s6 q ho(v y8ggprbm11*va zical 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 loops and a cross-secti3o; hlg*lmou6 onal 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 wink mv ,l,cg/-tre 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 xb8pvf+8emi/ 5 ndd8;e erhu/its armature. 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 the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be fepbdhvid8 x5 e/n8/8e; r+u mthe 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 tfc yb 6/jk5ja)-t5w x3d*urvsurns 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 genera0nww/)qy l h9wtor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.05ly9n/h )w0ww q0 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 gl96sw ) 3*r ka0fqwcx0kq7ugx enerator 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 6.00 W. The motor operat62cn en s0vnhx 1y,t7ies 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 ib0b p.(ofh1 :-friaya resistance of 6.00 W. The motor operates on 120 V y. fpr0iai- :(bohf 1bAC, 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-V powevsr.h:*tfok5jg -s+ 4.upi*wo)bh zhr supply. The operavt*w u+ 4go- zk)so h.if hbjph.r*s5:ting 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 resistancy7xa6gddxjx 5oa ;e),e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back xxjd; agoa,d7x e6)y5 $emf$ 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 pm+0capt8z 0ph5de *,lc; e kcsower supply. The ,a+ kzsthecp0l*e8c5 0cp;dmoperating current is 1.0 A at full 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 needed to reduce a prima l+xg(x9z2 4i;cnwr dgry 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 ma(ck4exio9; .ud ge +flow in the secondary. How many turns are in the secxe( .9c+ akgeio4d;m uondary?

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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 ahtwi u6koi01; 110-V primary if the 24-V se ioi10h6u;wtk condary 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 2000-qt1sep0y uyy((o 9rlf 4n6n*c turn secondary coil. If the current in the secondary is 3.0 A, what is (ptn1uy(0y6*fn o e yrq s49clthe 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%o+8t cb /up6xo efficiency, how many amps at 24 V can fuo+cb t/p8 ox6low in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provi.teb5a zaml e+(6sw,-it0j indes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primarysztt e a(j i6mw-l.bi ea+05,n 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 turkt; tsey, 4+gjns on its primary coil and 300 turns on its secondary coil. If 120 V ate,t; jstyk 4g+ 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prctw b):h +k/w 1ljro4pimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the k lw:hpw c)t/ +14bojrsecondary?

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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 tran a24. w u:apid7yccta1sformer has 100 turns and its secondary has 200 turns. If the input current ya2 caui:ca7.1twd p 4at 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 mg) hs(6od2dj turns. If the input v2)(h m6sojdd goltage to 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 transformer has 100 turns and its s-/fng7m6k mc vb 8gjxo zo/a:u5r i03necondary has 200 turns. If the power input to the primary is 100 W, we can expec/ -nn x/iu 8orok65jfba0 gv7:mg3cmz t 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/.a9t1 u8 kre7yo vu.i(ujans 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 t/.7aors81u (veyatu.i nju9 kurns 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 Aps1 oghk r*sevjy 8* f4,tl).b of current 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 percentage power lost in the transmissione)4sfol p,j*g8r1ktv b.* sy h 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 currjs:x.a:rl ,z) sc7lmc p52ay ment 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 percentage power lost in the transmission line if the voltage is not stepped 2c7z y:jl,lms :crsa 5m)px.a 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 resistance8(uvk/iyv)xrc; qu u )s+f2p p 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 r 8p( uq vy2)/s+)v;picxuuk ftransformer 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 tot -vbsjq-+dql jf/8rzd,9* vl v ycn8bmz(pg8 0al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost w(-jplq n8 g m, bd yc dsz9/rfzvvv8+b-q*lj80hen 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 linem-on0 74oe msokhz*2 y at 1000 V. How much less power would be losoe*nhyom k mos2-0 z74t if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be 85in fu ta.vr.iroe +l9n+cf-transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the orifi58nr o+e9v.fua+ntr.-il cginal 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 .qounce g l igg.++4m :7j*ptne2q1f k sum23xa current of 5.0 A. How much energy is stored in the coil's magnetic fie:2m.ou2qen+c qsg41e .+p utiflj*gmgxnk7 3ld?

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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 resistorg8t )u9e (cb yn(jfxm9 and an 18-H inductor. What is this circuit's time bjt(9x(umc )e9gy f 8nconstant?

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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 v9rl 62qgjamk)j:dc 3 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 ACjh-zyh0k7.)lcydi*ou ay44vf5fu -k 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. Wu p ;h,yp,iq-uhat is the resistance of the lam-u ,,yu;qpiphp?

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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 connecterel0 -uh2d(ke* dn;e bd to a 120-V ac power supply. What is the peak current through the resistr dhk bnle(e0 d2*u-e;or?

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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 cono x sthp f;w;-ev 933qam9ok+ynected to a 120-V ac power supply. What is the power dissipa9ex;39v w + 3shf;ypqtkamoo- ted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is jp/v m 09c-w9li ya.gr$I = 0.80 \sin (240 t)$. 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 resiseo;+nf7tad 5 n5fg+fj tor 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 50mtq0.h 0sjr2r7 mz/u1ofdekso q53pa;hu4 y--W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductorr6rjo /y5p.cwb ,s y dwig8m6)56jd hz 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 xbptz 4*v (x+d2.50-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 hao-hyj 3zmt10y ve 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 wgarxg6: )3 f;-7raj.aobsii for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kH;xfs*yu n.tf5z is applied to ifux;y5st.f * nt?

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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 vb x(9kf 7lgeg3aloc3/-gt /vcoil 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.ajdee6g*c*p( :rhuu )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 fmr78u2c:lr h is needed to have 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 have a reactance of 1200 Wd p/+ uaqnm1:3fj:7wzhb0 m + grvy3vj?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency widkrq ww-19jzz p.l ;k:ll the capacitive reactance of a 0.010-mF capacitor be 100 Wdkp1zk.zw9lw -j :;rq ?

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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 ji:9 5wluzfn/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 cinv.u9h0x n7,u40trw pjtf)ru rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 0r u 0ruf74,ntxvt9n j wph.)uW capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH co+ 7zep bhiytvd5g)8l .il, and 1.0-mi5e h.8g l d)p+btzyv7F capacitor 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 ank66apamwj:t ogb7 5c (gle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conot7 awpak 5jb66 c(:mgnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, 50c.- 6 s4tpktevaayrwhat is the impedance 5r6-p0tca a4te.yv ksat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whhdo6l qqfwi s:;;q.r gwn*y.0 d6dol2at is the phase sihw2 6d ;*w..yrnqqqolgo:6;f0ddlangle 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 with a 20-mH coil and 1.0-mF capa,f gqfjjq,bpnha72)gv5(zlve *79gycitor for a total impedance of 100 W at 1500q f2fj vj *y9hg 7l5bvp,)ag(e7gnz,q 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 ny 0yemt3n *uh,1o8jmis needed in series with a 100-W resistor and 15-mH coil to get a total impedance o yh0o1 uy mje,8m3nn*tf 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 indx +yky rhcr/u /aq+58auctor at 5000 Hz for a total impedance ocqk5a +/ah+y yrru 8/xf 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 resistor at 1.0-MHz for .rl b3a8ib; +fcv2vzs a total.cbbr3 +2z v ;vlasf8i 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 serie y bfis18xd;(v, :r :ozgre6whs with a 20-mF capacitor. What is the impeddho1, br(v86:wizrfs ;yx ge:ance 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 1.0l 5ks-dc 5eu5ds ;fz+ehxiw 8, kHz for a total impedance of f -x5swz i8se55+;hc e,dkuld45 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 capa ;14ytdpwd3t:l d/i (9cdfhfocitor at 1.0 kHz for a phasthd93 i;1ldwpf4:t /dcyd(ofe angle 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 neeu0kc texn3lcinb (js5 7: 5uf;kn)hg0ded in series with a 30-W resistor at 1.0 kHz for a total impedanc( 0f n;gt): ccublhx3 ei7 knukn55sj0e 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 serieqpn3)ly 8a9zjs with a 100-mF capacitor at 120 Hz. What is the phasejq 3 p8yn9l)za angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistoc,9q+ *.h ner n2ci 1pb5bqn n,e6schxr, 20-mH coil, and 1.0-mF capacitor arehheis,r e25n.6,cbc9 q+ bcxn*n1pq n 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 re bae/v 6vr4ka -gsr,h.4y qdf9.ya;kgsistor, 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 rfdegq r yk 4gv k,b.h.syar4/a- a96v;ms 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 W, ang1xluphzt/n5 i4o4 ((g frhy5d an inductor of inductive repx4/y5gg4i(h r5 o hut1lf(nzactance 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 c bteipn:3*eu 57he8, afu8ot gircuit containing a 50-W resistor, a 1: e5t nea3u*h, g7u8o fei8bpt0-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 series with a 500-W resistor for a ph rt(q-wom 5;bl(yeup )ase angle of-myqu)rb p5o(lw; e t( $40^{\circ}$ 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 k gy8 ga- 6gg9qdkcp;e.: cctd j3-pl+has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivig 3g.cqg;dgyp+ lek69:d pca c-jt8k-ng 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 resistance, 15.0bi:2aev8ior( l bp (d 14/rrju W inductive reactana(eu/i:2r8 ri (dbjbo v4lp 1rce, and 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 kui 3zfje;1wgu*(m ;yis $63^{\circ}$. 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 resistance /vfzwv4a1 3p *xsct2a of 30 W. What is the power factpca axvtv*413/2zws for?

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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 RLkkd- w61pec le 9mw()wC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenlk mwew9d-1eck) 6(w p connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH bn8:jejjk :s9(min h0 coil in series? n8hm9: ke:ij0sn(jjb

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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 wit1laa5x hxyd;zp m(1o4h a 4.7-mF capacitor for a resonant frequency of 10yl1h ; o a4(dmz5xx1pa 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 wi0lw)dz;pesx ph /6yeb4i/uj /th a 3.7-mH inductor for a resonant frequency oez/4 6)ehps0;pylxj b iu/dw/f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-4ll 0ayo 2ew(pmH coil if the resonant freql(pae4 low2 0yuency of the circuit is to be 1000 Hz?

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