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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 c,oib+z5q i+zare 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 inductioq4vt bsll1 46hn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chzp/ .jrybz 9*9tbvgo h1nn 2+hange on the indut 1n or jpnzbzyv9h2+/ 9gb.*hced $emf$, 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 ms).ory:zf/vy sds u xq +ai/0-agnetic field through a loop of wire produces what kind of chano.syazys /:)id u-/v+sr0qfxge 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 ldz 033m:0cs poaat :oooop of wire produces what kind of change on the inducedz 0t 0cp:ooam33d o:sa $emf$, 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 magnetic fielfu 9d paiyg -ky -0e-717iwd27pax hnud 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 i*zsdu4t:ehj v3nt 4v0nduced current in a conductor will be that which tends to produce which vte :u04 std*nzhjv 43of 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 ab3 4lu ; 1*ahfh.td yk; gllujulm7q83 horizontal table. A bar magnet is held above its center wiy h87uahq;4l ;3djl u.l3kfmb tg1l* uth its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablp:n 1a xrcg97u8mu+lje. A bar magnet is held above its center with its north pole pointing down, and released. As upmnlgc1+8 7aur9: jx 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 ryaz m) 9*.qg3lxqcg e.egion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewy 9*g.z3g.cmqx a)e lqed 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 regio,dzqay267gsdh r-x/vt8/vh gn where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this codv78h 6/xs2/hdqg- yvzgr,atil 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 magnetmqrb o5ty:)qqbl m v *x1ii,.6ic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced5*,)ylbi6 v btqmqom 1qi:.x r 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 an ever-increasing csysr 7+lyew-tsqiq+r 7k 1za;-y5 cy2urrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, wqzey5ykscsr y--+ 7 riaq1y+l27;st 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 entering e).h; plpb .yifirst. As the north pole enters the wire, the induced epihy l.)pb.; 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 r dk 3ynz-y3zb4 wbx+*. blzaf8otated at constant angular speed about an axis whose direction can be varied. In a region where a u3bb4 8-nykaldb3w zxz*fz y+.niform 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 uhvkq w 0z369 q. g avrta3i:/9tojy5grotated 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 36ag qv qt/.auj kg 99ht:y0zw5o3irvorientation 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..vjk 9z ul6v4um+: m)0ek mduw
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an u73hxb abwm:ig3jju v, 65peagp/o82$emf$ 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 magneti 30g)ufxk*hgtl)ia u8c 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 easw -r h/azlxl657j:bcat-west direction) is moved northward at constant b7ahr5 -zw lc/x6ajl:velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a const64b0xw 2rt/fhjb- pgtant 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 transform:4iddjuf47jhq4e q7g.)ny ig s

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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 ib4q.va suvh xmh37 r9 ic22(cfrequency of thevii( 3u2qr24h7ccx .msb 9hva $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tv)1 aujowutv1 -0 d; ;9hlqqrho

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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 +ow9(,p wq7q.wlrecnimw 1r q (s6vh(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 co6brfyg:p ab 2 r+rm8k6ntains more loops than the primary coil then 866 frmpbrk2b+ay: gr 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 cont vb9 m*ocywg nf).en)1n x6x0dains more loops than the secondary coil then ite1 9 monyn0b6xng))d* fxcw v. 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 p+at.qx ) r),i8s+br4 0wpjvdsrw e2laower 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 cirn- xcj.(hg 3oncuit,

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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 sxb y7.zl.5* v exnf;kteries to an ideal battery of constant terminal voltage. At the momen x*x;bzne..5k fl vt7yt 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 battery ozk(sw bb-3 8evdgv4q5j wi)q7f constant terminal voltage. At the moment contact is made with the battery, the voltage acbe -zgwd4vq qv 7(si8bw5kj) 3ross 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 - ((nr k*o9 4t,:rjkedh6dqi)fzmi s cis 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 inductano5a/ybk 6a 6 xbvfi/z7ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thejkp g9 ;y;o(ab time constant for the circuit represents the time required for the;op(gb y ;k9ja 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 .e88)ac lawwb are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit representwwac8 a )8b.els 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 21h/ hx6v neo.,jmitlcpoq8h: (bg,k the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, 0gxz ac 3+ge6nxxb9n f8q4ka*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 supml4b)c,gdzo2eu2qzoc /n+ x) ply. In this circuit, the currenlxo) d4m/u gz bo+),cc2ne z2qt

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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 th h xy-iscs.njrl6r3x9 r,)xt1e frequency is tripled-xh9xs.)ri r, 1rsy6t nl 3jcx?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductivr tkh:sxxn,o- r6 t*.le to r- lr,xk* 6:sntx.hreactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acroum9ifi*2z oh9ss an inductor approaches zero, the inductive reactance of tha 92* umizhoi9ft 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.*3ypn tf sz;v to an AC power supply. In this circuit, the currentvy.fptzn3 *s ;

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactank9g :qp0h5(2hbh vjmn(gc/t zce in an ac circuit changes by what factor when the frequency is triplednhcqtzv9h :hpm(5 0gk(/2g jb?

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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 acrzyyeu) de+0cy y( ;pb(oss a capacitor approaches zero, the capacitive reactance ycd (( p;yy+0z )yebueof that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and. wl-u ndrvuh u(24( kvq8r8vuwx5u /g capacitor in a RLC series circuig2/k(uunv 8w xuu. wudvq (r-84l5hrvt?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as v ;e, pps1q5qs+4kgxl$\cos M = R/Z$, 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 increaser zoet+,x;p+o72 ifsms if R increases. z oi pos mt7f+2+er,x; When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increff f*vb,of 4ud1rm cf)q;3;chc pd (+bases 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 ,t4yxea3 n0 7 v24nzhbqrk1zaincreases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circd(sqf0rz*(u r uit, the resonant frequency of that circuit wilur 0szfd(*q(rl

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circui nyf yw:c2+vndc*b,.g t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cir-3 m-66lh tyjgy3q kqlcuit 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 rader0zalrz0-f e:z9 q*(go9rxzius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel9fee zzzx9( o -zgq0*ar 0rr:l.

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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 r(; gx;j( yeck81csj6o 9z dk/cy t;dzemd:sm-adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane/e;cys; cy;gk cm9:d-x8 djsmtdj( 1zek6( zo 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 ro-tc nn ) 5uh)/)ycamjvtating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mjhv)/-n y am)5cnc)ut agnetic 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 reducevv ;2xft)gnyak6:7m.yo2xac d 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 chq ;m8mdju/ r 6wkxnt93anges 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 wirvq, ;yjw3 hda*jr(oh0e on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thhr,j d0*(;qy vwo3ajhe 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 withjf (6 l;*d)kvia0h bynvo .we) 15 turns 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 .vde/piuyk g: *dn-.uarea $0.20 \; m^{2}$ 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 horiddi2 onm67;w izontally at a location where the downward component of t7 no2; 6mdwdiihe 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 bm xgs9j0- nis;ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s aboutsgs i0njxm;- 9 a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionap x .dyzyqqx;5 1t7fj,l 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 ofh3b2+u1x3plxhtr0 d b 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 rectazo es-d3e9rxd1r t77yerfryc8kv ce :3:9+ bfngular loops on 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 uniforzk d y 3+t7o:7rvyex99d -eefsr: er8rbf31cc m 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 turns of wire of are1 8 n*)y 2eshxea;val1*wakcka $0.090 \; m^{2}$ 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 wish7bl6ufvl/:jcn+ -/ s4-aod wi a2ckil to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If t in6bl-w4l:j+ca c/ -lfdauki s7v/2ohe 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 gsl eo.on(v t7/h0- (6vavusso 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 resistanckk..*vm. hu j a9t:i ckcu4x,de of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motq );iab+1s(le;x jk rw rr0a)zin69 c2hvm8b ior operates on 120 V AC, and when running at full+i 9)jz)am h1( b;ncxiws0e b6arqv8 ikr;r2l 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 hviy :sa e56t0to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren 5ae :h0t6sviyt?

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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 cojcw1lek mb1*zc5y4(k nnected to a 24-V power supply. The operating current is b 1wmyk(14jc ezk5 cl*1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poweund3c+4 cz gjrpo76w)r supply. The operating current iz nw 7gpd4)3jucc6ro+ s 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 pr5h 0eqdch:r+hr2 at a6imary 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 Afw9m qp eo5u8/ to flow in the secondary. How many turns are in the sefm5/op8wq9 eucondary?

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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 ne g-s5ay( 9lod4ifmr8 mcessary in a 110-V primary if the 24-V secondary has 109rm8dy4-glms( a5oi f0 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-turna,s;9dox+ o8ajdk;yw secondary coil. If the current in the secondary is 3.0 A, what is the current ik89+joa ;s xdyaw;,odn 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 thea m73ef*z+l(jz jfxi( primary of a transformer. Assuming 100% efficiency, fzm(+ jja(l 7i exz*3fhow 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 n 4ut ux7)nqjicm 34-bvu8ld l8eon sign transformer provides 7500 V at 10.0 mA. The primary c7xu8u4 uln j-b)3 lv8 idqt4mcoil 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 prcw i-/qu7 b8htimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in theq7u/w -8c tbih 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 s8tovd4qh ha); econdary coil. If 120 Vadqh4h8 ;)tov at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuvrc2oblp55 : nrns and its secondary has 200 turns. If the input currebl2r v np:5o5cnt 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 transformer has 100 turns and its secondame2ar;b;0 gva gy3(nl *srae9ry has 200 turns. If the input volta y (e02;gae*9aa3brvln gsm r;ge 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 1h 2wz/sel68oo th e vfvbre yls2-588000 turns and its secondary has 200 turns. If the power input to/8 0 v26swlbh5 tr -oez2e e88yfvolsh 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 currento 3i 3r/x*pmg0s lz:tm at 120 V. The voltage is usually stepped up to 4500:p0zs3tm/ mlrox3* ig 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 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 0uzp+y1/,p 0zbe0l/m)sg sdbtwsq j8 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lint00lp)bzs/ 1muw/j 8sz,qyedgbp 0s+e of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe8mojq)d,r fo)ae x)+nd up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. ,o)jo8qx r) )+ead fnm 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 resistpu11h any:62z .wqv hy,wjn6 umzp w8)ance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating ozua :, )81hm6w1 j.qnhppnw zvyu 26wyf 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 go8 .+:rmmj:vka)x+ g5kyv kxaenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltak.:k +va5rm o+ag ) :xjkmyvx8ge 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 much less power would bem)4vr o-gkb4f0oppm65)pl c a lost if the power were transmitted at 3000 V instead of af5pck4vm-40p6b)ora oplm )gt 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 atre8u 6d oa* n3b8d8gha okva54 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must thekh8 a8bg84av ero5*d3 au6nd o 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 5.0 A. How much energy is ,11 nvio kyz:h vy*m q;q d5bdy,1jffs7x/ ;uistored in the coil's mag/quh v;zo,by 1 n;ifym i1yjd7vdk*,q :5fs1xnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What ixua8 -ahz xhe5,pj(l5b0qkz)s this ci0j u5 -z8khx zae,qa 5lhxbp()rcuit'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 AC circuit k c6b+n0lwok, 8- h a528kp4zb u jarfjys4p.nwhere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is 2m(y:u, bjxo 1:xl7ptoasaha9 sc;2 p 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 outa, m4 fz7(devilet. What is the resistance of the lam(v7mfd ,4iaze p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whk3u3j 1yj /ogeat is the peak current throughoj1g3jk 3u/ye 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-(5pt i .(9hapd:v9eac bl9hoiV ac power supply. What is the power dissipated in the9pv 9a o(e:a5.tc phh(9bd lii 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 5)80itbhnvq 6i: np7 .-p mkrjr0-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 resl 3/b1upk;q gh// .erasc 4jl f5rz-wyistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is sz :+vw7+tgq h$I = 0.80 \sin (240 t)$. 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 in5p83io pgo 3,f/gs j3pr bc9buductor 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.bn)oq2f8hn 0nwhi 3 r 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 wil6onk)hcr7yb em,z* ,ul a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive re9el8jf,q sh psz-7w5j*q+ grgactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz wt (q/8iauntlrmw0, /is applied to ulw,/ 8in rwm/tt(0aq 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 110umsj,l k ;en4ny57ro+ -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 capacitor at r h;1x7xe 2if*qn:cck 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 ko8xpw* :,gsekHz?

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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 o7rl ,fwapscxnm7 i3,, f 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 hue,cy2g7x dvs.v *6ncapacitive reactance of a 0.010-mF capacitor be 100 W?v ex n7hu.*sg2vdc,6 y

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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 capam*qy +kt7cs n2dl1*xw citor 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 *1ro-.uy e.yk eth q*vcircuit with 12.0 W resistance, 15.0 W inductive reactance, a .hyr1q *kuyev*e -.tond 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W re/ ;1uov iwa-is52k c;1qk oqehsistor, 20-mH coil, and 1.0-mF c1c- kqeki;huqoisv/a 2 o1w5; apacitor 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 Hyj;bkl -agg1rj2wfxf o n-8 46z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arer-8;kofb12wf- y nx 4g6jgjal 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 indu umt- 3zd(c:xt5tlnm4 ctor, what is the impedance at 1000 Hzutnltmdx4cm: z3 t -5(?

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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 connectech f: bcvzv+;u9*zki5d in series with a 20-mH inductor, what is the phase angle at 10h: iccuzfk+5;vvz*9 b 00 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.)omzt234)(qsxgp3 .yuz u,4wgk9wknl bpn 9o 0-mF capacitor for a total impedance of 100 W at 150qyz(,9) nslwgwz o.p uxtku )b9p2mg3o34k4n0 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 i 9 i77onvws2syn series with a 100-W resistor and 15-mH coil to get a total imn7i w7vs2os9ypedance 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 serie 1kpzdz(cq:hlg 7d .x4s with a 450-mH inductor at 5000 Hz for a total impedance of 40000:q cx gdk (4zp.7zdhl1 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-kWb61eu ,cjz:gg resistor at 1.0-MHz for a total imped6:,e 1 gcugjbzance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is 4 k4i ruig(9;u;xbazwthe impedance at 1000 H ;wri4gb(i4zkux; u9a z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee7b,jl 0.)+u4+ ksjqibi jal xbded in series with a 10-mF capacitor at 1.0 kHz for a total +7jba lqi lj,bi0jux ks.+4b)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 a ayh8po9eyyhsbb pi.98 0 bx2)10-mF capacitor at 1.0 kHz for a phase anglea0b9boy.bhps 9h 28yipe8yx ) 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 neededc w jr,0qnh36i in series with a 30-W resistor at 1.0 kHz for a total impedancqi 06j,wnhr3 ce 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 wi cg,s3,dkli+yth a 100-mF capacitor at 120 Hz. What is the phase angle,gdcs k+liy, 3?

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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 resii p.tr. /mbeto4e dk0d-cnim/s8k:( tstor, 20-mH coil, and 1.0-mF ci-odm//t.( d:inp4 ekc0tk mb r.se8 tapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitrsi6:7o6 xq vl bog l,d+6q( pwto1w0cor, and a 0.350-H inductor. The circuic6+qwiw (ovl:6dx b6r,o p0l7 q g1tsot 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 3 8-spoit dz57qnux2 5a0 W, and an inductor of inductiveiqupn2xtd 5z 5 8sao-7 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 circui8qgt)piob ;) zt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect zbgq o)8;tpi)ed 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 k/zfc g +;nd1aj5ykfyc76b j4with a 500-W resistor for a phase angle of5yb1c j;gfn+za/fkj7 dc 4y6 k $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fr kyha1s0-k hzi:4jamktq;iq3eg 714k equency should the circuit be driven in order-43t h4 qe g7syk;:a0km hj11aqkzki i 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 resist 3b*1sce,+ twm his0af4lnjl7e6y n2lf9ljv 3ance, 15.0 W inductive reactance, and 10.0 W capacitive rej+fc3 f ev9l7 *smb4e hyj0 ltsl,1ni2na3wl6actance, 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 circuix.g1c 6h: c ;q7iy9dspfqf;dzt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an imp uk bl,.6gyu7lp;yxx 6edance of 60 W and a resistance of 30 W. What is the p ;yp 6x6klbl x.uuyg7,ower 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 resis* 7phek ; w52:bj7h86auyzzp )oo+-crrip rrbtor, a 10-mF capacitor, and a bah+*7z rw7 roy)je62hkr;pz 8-bp5c:rupoi0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in series i3b7bg m/.:obpy*amj ?*.gba/i7o ypm bbj m3:

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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 with a 4.7-mF capacit72ea/est d)g sor for a resonant frequency of 72geda)s s/et10 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 with a 3.7-mH inductor for a resonac t;rb)(sa,w znt frequency of 100,s )wb taczr(;0 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 resisaii 01/ ,kmfhsd*2ah xtor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?d 0x m,2saf*1/kih hia

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