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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 ax ryv( zgu xi)2(5go0kre 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 states that thg:yumr7 2ox1w e $emf$ 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 chpewnnq9 ifhj;a83m, ges 3/7 oange on the8h73nmn,eqw9ef ;so/g a3ipj 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 loopsh;eb4) ;pp q bic1(hf of wire produces what kind of ch(qh; sb;c i 4fhb1e)ppange 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 ov rcylv8h87jy) 2rz+of a loop of wire produces what kind of change on the induch7z 88l rvycjo)+ 2yvred $emf$, 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 mv5ayc8 ,hj v7tg1d mcxh.)+t uagnetic 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 directionl*h 5+a6zt;ikap k3vx of an induced current in a conductor will be l+5xptk63hz;aa*k ivthat 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 lies flat on a horizontal table. l-wbfy728 qrvA bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed f2qfy7v br w8-lrom above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held)v+z81di tqiucfaz5 . above its center witqv1t 5)8fi.zz acu+di h its north 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 uwrcoka,rw5i ::z5 5dregion where the magnetic field vector points straight up. The magnetic field vanishes suddenlar w:kwcd 5 u5o,r:5izy. 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 vj zo u+r8,6/ts ;sorla region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this r;ou+r/lt8z sojs6 ,vcoil 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 f1* qp m2db.ohfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currmob 2pqfd *h.1ent 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 li-:7)mxfjv4fw vc, lcues on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abovw, 4-vl)j fmf u:cxv7ce, 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 pol pablh0y1w(9+irqnj 8e entering first. As the north pole enters the wire, the induc0jya +h9 r1p8iq(w lnbed current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular so0;rl yb.e d4rpeed about an axis whose direction can be varied. In a region where a uniyr. ;4oe bd0rlform 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 wir.7ni i5z9c qmsyths8 0e is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, t 0izi98ncm h.75qysswhat 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.py /e8hsky r6.
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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 iv 2wiroy9jiex25* o cc)t 0r0that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic f3erqq5*:idim5ma1u-mo 6 ox mield. 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 directaif,ov;x(ey/m 6km lg +xf*8e :s3;tw c nt/iuion) is moved northward at constant velocity through a magneticn ,t ukvi/(sx3*wxomtlmg;eaf;/ f:ec8 y 6+i 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 wj w7m (x49tqpa constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans/ c 7sz.ujrz;x ziw9e:forms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions e0ex)21 ag;qw l rsz-j x(x:0y0ndiezhach second. The frequency of thxr0e( 0gaxz1-jhz i qynsw02 l: dex;)e $emf$ 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 dojui2 vq)h/a/evice 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 deupwsml u)* x5j +3yk;rvice 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 2shpm*so; g- hthe secondary coil contains more loops than the primary coil then it is-2g h*sm;shpo 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 pre7/ + m0yl mhy-t-x/*l hbpqovimary coil contains more loops than the secondary coil+/lmey7*lhvb0ox/ h -qp -ymt 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 inpu a)u3t5mk t:a4kdp x(wm23uoet

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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 kzln z 1v75.rbcircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an (8gfh;tel 4 ia)s fvf66ebqb*ideal battery of constant terminal voltage. At the moment contact is made with the ba6f8tsvqga ffeb;b4l( i)h e6*ttery, 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 of conh )d dakjuohk(;/-q6. crjrkd 22uj;estant terminal voltage. At the moment contact d;j2 hq2 -kd e(oua; khurcj/).k6djr is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L .p*06t92ina yvbiphcq j2 g-j and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit wi bt tp5*j:j; sl,abq0dsr- (yhth inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s bann.8tc:2f deries to a battery. The time constant for the circuit represents the time required for the current to reacnf28 nactb :d.h

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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 i 0ki 8+nrx5/o yfih4xnn series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time reqifn40r/ xx5in+ k8y houired 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 hau5btkhes,d1 zu j3v2ao ;6kl9ve 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 At px jpt-57y;cc*/hgqC 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 supphb k/ tq;k.-t3fzmxn/ pli *d6ly. In this circuit, the currenqm i*;zpkknd/.fl-t t3h6x/ bt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance z,7hg0 sz+bgckmx 4rcx2y*u, in an ac circuit changes by what factor when the frequency is tripleyu2+4zscgmrk* gz,x7 ,chx0b d?

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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 inductic-ddodgaq6 9( ve reac-q 6 g9(ddoadctance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indu5;o /zvefw: b nt:fvu +ely(g,ctive reactance of thatnofegz5uw ,by;v/: f+( e:tvl 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. In this circuit, the currh k6b , 6,lro(czr3dgdenzdoh 3r,b6gkr 6l, dc(t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when th7mj7j k4 4vrs8dpo qx1e frequenokm7qxrp v41 j8sj47 dcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches z.m2azkxd rz1, aduk9. ero, the capacitive reactance of that capacitor.2x.,k9urz d amd1akz

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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 th3(c rw5 r 5hyc(l2yeixe inductor and capacitor in a RLC seriesr32l eh5w5(( yycrcix 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 anljfa,v/0d+ f u 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 wwo1a 2i,bc z.pd6q4g the circuit increases if R increases. When is this statement truqpw 2dgo,1w6 a z.ibc4e?

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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 increa lkbacweh ppn:)a07k2) e;g 0s.8b(wj)jhly f 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 thi 2uxn433z3 wj hqiu;7sij 4yqe 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 capavus;lb00h xbg 7ca0dr+6w j0 jcitance both double in an LRC series circuit, the resonant frequency o0+wxvhba ;glb0u0s0 crjd7j 6f 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 thakfut 7lv d+)w2a:r sk jafu/*0t 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 seriet9 (:*brm:x;yan vnevs RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 9p;q8g w h 0bi()zorlcm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planebi8o(); czrphg09 wl q 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 rotatbygr-( 0vr *fr,l m9dzxkztn, l/61gxing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and they6 *0 df (g9xlnxt/ ,- bmz1,rrrzlgvk 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 x:4 ex)mh) gznis rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo4)xmgxzne ) h:op 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 fr6/hs be: ,squgewa pehy c312+om $1.0 \; m^{2}$ 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 changeha 8-6xka )dx:tsc)qts 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 squ-8h-v g85 d,ob cn0pwj3 wkmkgare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average val ,5pg-gwbc83 kj8mvk0-wdn ohue 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 wirg )atgdm064 xuw: g2fse with 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 arer7:y amg: 9h sfthjs2 r(*n-nka $0.20 \; m^{2}$ 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 wdg 8c, pr)e305hugkjyb4j e-ling span of 60 m flies horizontally at a location where the downward component of the8b05jg e) -pe g4rjlhk,dc 3uy 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 mi co69lf;h7rr 7s+vtd long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whilrfc9vo7irl7 s d;6t +he 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 l 38wq -u(/mlal1x 0 s q3dhmifiw:u2mloops 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 of va,khc0d7s f:g x 8b,rarea $0.090 \; m^{2}$ 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. En bc +)8dumhc7yla:/oach loop is 12 cm long and 8 cm wide. The armature rotates at u a)c /ly8c7hd+b:omn1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are ah0/(zeezp9 v +ac 8igkqks,2a $0.090 \; m^{2}$ 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 sxgnap m9gv+5- kze3 e4imple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the are+ e5e- mkvxgpga 439zna of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maypvtru u *4p0k;(1 mreximum $emf$ 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 ipy sb ..)boqp 7rvhur(ai 7ishw;-85 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. Tp9dlb(z ;;bis 6d*xnqhe motor operates on 120 V AC, and when running at full speed bz ; d(;ps 9xbdlq*i6nit 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 comj a,q/w+y* kjnnected to a 24-V power supply. The operating curren , jawk/yqmj*+t is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is (/n gf).gx2cutgnq +v connected to a 24-V power supply. The operating current is 1.0 A at full speed. xc./tqfg gg(n+v2 u) n What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. 9(+duoudn . ql 1dbdj, The operating current is 1.0 A at full speed. Whdjqd(,od u dl9nb+ u1.at 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 transformerb jun(nklh7;m;; t ;io is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfo8e9 em 8rv) */4htk, reivxttwrmer causes 14 A to flow in the secondary. How m)tt 8ee*em 9 /vh xrr8w,4tikvany turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turkj x)oli5ipa:pjcsp9mu9 m hs )g.)6-ns are necessary in a 110-V primary if the 24-V secondary has 100 s9 ps)lm: g6)i p.9 oaik5cuhm-)xjpj 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 coim+*2n 2qdv (hqwx7g-kqm.pe rl and a 2000-turn secondary coil. If the currentemkh-gm2 * . 2q+wpqv7rdn( qx in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transfd yqa/9abq:;bwhha3 +no; c4xormer. Assuming 100% efficiency, how many amps at h :q ;bq/+3oah9 yaxb;d nacw424 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer proviu;rjwolg6 de95,.faoq:vu3 ades 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th.;u: d qwrjeo v6lo9uga 5,3fae 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 transformeres,i;11g z kw)/fpeqf has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primar )s giek1f1ewfq/;zp, y, 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 ande 1j.;c.t,pk lvy( 4 iat8hvmt 300 turns on its secondary coil. If 120 V at 2.0 A is applied a8.tcvv iy1jt.( ;e4l, kphtm 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 turns and its seco m gcag*pj76qml82 l,gndary has 200 turns. If the input cur 8mgj l,gp7*6mgq2 lcarent 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 transi):itu6wt0il former has 100 turns and its secondary has 200 turns. If the input voltage to the primarwi) tu 0i:6tily 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 secondars:/ bvv0wx09reoquauh -6 q.hy has 200 turns. If the power input to the primary is 100 W, we can expect the power outb6.uh:qxsrwvvh /-uo a009eqput 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 kkkr t5bmdq-fx78 p 0.A 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 number of tu7bmktrd k.f xp5q-k 80rns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped hbb41 h7knyr8 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 li 41bykbh78 hnrne.

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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 iuouc.e:c8 y 4 d)ouzx/s 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 transmissiou:ou ox8dzce /4. cu)yn 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 resista(nb3ks (z/osxyq (3p ri6/w oknce 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 wit6r((wik b/sz3(qsno y/kpx 3o h 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 genf7 9heu+x,ylm erator 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 tu9hxm, +elf y7he 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 5s.l/4 i1 mgizjlmf )dl)bvl+r4 inc, vrr3,k much less power would be lost if the p)ic1 mm/d+4f . vzgv5rsrk3n4b,ilj)lil , lrower 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 at+p9l(u-kuf0 1f.xn,axne e be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a trxfu1ule9 n+ke(f0n a-,.t pxaansformer 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 curreneso:c7bfa; 8lhaf rg+9u*i)tt of 5.0 A. How much energy is stored in the coil's magnetic field?r 7is+c8g: *fltbh ae)u9oa;f

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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 an-,wloc xflo5x/);zci d an 18-H inductor. What is this circuit's time co)z-icol5cxx , w /lf;onstant?

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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 cut dq1r+f., qwircuit 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 ah2wzrga bo .an. .g.lj(pk4h+ 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is tge82) yggf1x df f67ethe resistance of the la7f xy1tf2f6eg) e8gdgmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peakhz/vaozh0,zhes90f + current throughs/ehz9hz00 ha ovz,f+ the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac pb,96spj g1 ntbower supply. What is the power dissipated in the resi1s6nbjtpb9 g ,stor?

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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-Wdu8+ tfz1zv j- 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 resishn1w0ik 7rb4z f1ev b4)krog( 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 50-W resisvas9eya:ds (1pw/ 06d wowcs5tor 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 dqp;7:mkkn u6j5pc 43 +p7g 5 w1gnwar 4jldrs1.0-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 react3k: zez2y qq3kance 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 coi ;ja;wt b/orqkerjr;b m6 (5s:l 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 reactanqzpzo wzhp *1-;7s3e 8z6l iwace 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 fwvzt8q4v; phyw 5u h((zav,,AC at a frequency of 20 kHz is ft,h((;yqv8ah vz w 4u5zvw,papplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcef ,rq xhz o/ni:lq+)-c?

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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 t; tl x15aqe*yreactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W ofet;qer7h .xd dir 08/g 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 b /y+b()uenpr/*- k et l9gled10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive react0.:sz bv6tm*f g.sv htance of a 0.010-mF capacitor be 100 W?szmgft:v.6sh.vt b0 *

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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 thrx 06egssx.1mwps x9gcjlz3,7ough a 0.0010-mF capacitor 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 kfz 6:8n,52xp l6tcyk ygt x;sresistance, 15.0 W inductive k568xptflszx, 6 2nckty g:;yreactance, and 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 im(e b :qw(x 2jhh1fsd)mpedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connech s 2wj:fmxbhqd(1e)(ted 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 coil, and 1.0-mF 1lgj, fa pbs7+ + dbda6ja6x1qcapacitor are connected in 17al16pfjd6s b+gd,x aba+ qjseries?

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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 connecteds5z- eo. pt4mg76wa hp in series with a 20-mH inductor, what is the imp4h w5gsm.a6z popt-7eedance 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 20-mH inductor, wc emf:hb:,tyjmp;5 v4 k9 d4mp*3cabk hat is the phase a :p4c: *pt4j;5y,mevamdbm b9kk hf3c ngle 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 20gv e6x.9gn8: ccn(b pv-mH coil and 1.0-mF capacitor for a total imp 8e 9c( p.v:nxnbgg6cvedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wit uzft:943o jhnkw-tz1 h a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200w4hzj:1zk o - u9tftn30 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 bpra +o+ ep/q*a total/oab+rq*+ p ep 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 103.-edgy8 nl8m diviev14s1 mm , za6jg0-kW resistor at 1.0-MHz for a total impedancysm1v gi8m 4 deaznv3 g-l,jemi .861de 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 seriesl mo8 l(:;7xtr6km bow with a 20-mF capacitor. What is the impedance at blrx7;mwlk(oto 6 m 8:1000 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 ag,u a;r7 irbz* total impedance of 45 ;7zar,igub*rW?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neeof:8xpk)+ wxww6xsx 1 ded in series with a 10-mF capacitor at 1.0 kHz for a phase angle :kof6x1)8p+ sxwww xx 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 b fkwh;jt 6hk3pbv2) 1/pk.sda 30-W resistor at 1.0 kHz for a total impedance of b.ps/khp6tkdf)1 3k ;2hwvbj45 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 mpowe (3 +utqy0k0qnyuy0s ;5capacitor at 120 Hz. What is the phase angsu0;yqw3pky y0 e (munt+oq05le?

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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-mt h8:sg/c3qrdk8.s or H coil, and 1.0-mF capacitor are connected in se rdr8sc 8/:g.t3ohq ksries?

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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 rescqvj fz2+ua36nq v 8o3:hith; istor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit isa3nijq hh + zf: c628q;ovuv3t 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 W, and an ind3.ldwrkwro5 x vv3tv5 -27ng auctor of inductive reactance 30 W are connected in series to a 11ldw32.k3w rgr n 5axt-ovv 5v70-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 serqnl2uedg7*qd c5:be,m) zvs 7ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inge,5*b2celum:7)vdszq q n7d ductor, 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 nen2;lwz9c ni4jwxyno.:*kn;x lc2 u7 ija3c s+cessary in series with a 500-W resistor for a phase angle ofuyxx 4ccn:s * jjowwl +22; i. nnz73nlk;ai9c $40^{\circ}$ 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 w718spn ;exipz hat frequency should the cipn;x pe 7iz81srcuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12vtod-in-zp( rfam zw4n.3 0 f;.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12.z( ;0ona-dmwff v4- rp nzi3t0-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 )t78uas l;aefis $63^{\circ}$. 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 ;j4ev-zh u p0yjr+ v5lan impedance of 60 W and a resistance of 30 W. What is the power factor? zv ;-je4y+vu0pl5r hj

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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 circ05u(a x/ip6gtlkv rc* uit containing a 50-W resistor, a 10-mF capacitor, and a 0l pkg(*/v 5 ctaix06ur.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 capacp2. ad cwkpau vl 8)p2ch it103sl3gp8itor and a 15-mH coil in series?pap)1c2 2 0kt8pp3si3c8 dvh .w lluga

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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 xzd dw,i *ws z /f+o:(o7o:yaya 4.7-mF capacitor for a resonant frequency of 1 wa:d7o/xo,+:*wsyz f(oziyd 0 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 sgvdy5rvmnw i- 0ei9*a2w. u.8o :eh dm(aij)geries with a 3.7-mH inductor for a resonant frequency of 100 miae:hi) 5iydum8 9 2dw*-g.v jne.(a0vrgow0 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-mH co.0;w, fcv zn.pdmpyg5n/ l5 5ct*hwzril if the resonant frequency m5r.pfvzczyh;5 td 5 w/,c*pw nn0l.g of the circuit is to be 1000 Hz?

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