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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of*b0di- 8/ lfv/kj80y iijjnst93xo dn/ ahvy9 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 indu rm 6deu-- h)xmdw/ds89bd )cpction 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 produ0cr3cy dtmrm6a,c:io9e 32f lces what kind of change on the il 2t3cf6me acr,3d yc9o0 ir:mnduced $emf$, 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 majpa-r/ 97*,jrux:x( vocr -: svp+s hatuun8qgnetic field through a loop of wire produces what kind of changeptpoaj+ rn8-: * :vcu ,/xvs rq-79raxshj(uu 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 wel28 bqr;rq7nx )5aug ire produces what kind of change on the induced8rn rl2auqeg );b7xq5 $emf$, 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 field a*(uz qf:/s 52 ,w-vlmmoom kxsn $emf$ 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 curu+:,: i l4vof8 oxkfdvrent in a conductor will f o:fi4u8k x+ov :vld,be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hopo- p /m/3pbbtrizontal table. A bar magnet is held above its center with its north pole pointing down. The pmpb/o-p3 b/tstationary 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 table. A bar magnet is held abo3lmau+bl32raeh9 ow+ us)k2 lp.oi5 ive its center with its north pole pointing down, and released. u+lliw2bar.)ooas+2pehum l 3935k i 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 ta0:sl jm b2tm ;c2 ffmds;4hopp,5td;able top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what ;fc tdaomm2h2s : lf4;dp0,5t;mbjpsis 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 to;*dmd 4 hnykm0p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil a;dy dkn4*0mm hs 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 f/g4a4g4fy jlib,ce +cield points straight down. The magnetic field disappears suddenly. When vieweec/bg f4 a4yi,lj4g+cd 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 tablk w 7bao9m2-b3wztfq+e 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 above, the indu qat-w+z 2km9wbb3of7ced 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 enc mazzm a5)b(8tering first. As the north pole enters the wire, the ind z amz)(c8mab5uced 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 rotatedyf 6uo58 ,jwc.days/m at constant angular speed about an axis whose direction can be varied. In a region where a uniform mam/f jdu oy,w.8cays56gnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speedl.+1g9w ynue5q -qr r4yp ,3f ;owdeyg about an axis whose direction can be varied. In a region where a uniform magnn e4-qgwr+1fdeo gu y;ywlr9. 3,y5qpetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.zz 1 dne00 v+1ibogm;myoph1;
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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 2 :q:aw4q ees:xa4,d lb hc)anuco-- kan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field .oh cg7 e:joifys7 l5og4e,(r. 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 (orient6o/ t+h+ze sh*s )4qat4vusg aed in the east-west direction) is moved northward at constant velocity throuhosz/t4uha+a * g64 ssq) +vetgh 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 rotatiyb2ikfr 1 0rvjv4 30jes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator thaei1ohn6 d94 ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutu:)c(hebbs/ fiziw 7bt(v- og+w :*tesde+*l ions each second. The frequency of theo g ebdete/bs::-)iuht7v+(+z b(l*siww f*c $emf$ 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 usedt5mvn*x ok(xk e /j52rx0p) hy to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th zt)47lgmf t h 0 cap-vrx)0l0p/hxa8sat

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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 lomvts *i:1f2 qgops than the primary coil 2ms:i gt*v1fqthen 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 loops than the second/du 4jm*y +qjnary coijuj4*nd/y m+q l 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, thursbdsx2: e, :e power 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 resonade lvlf*x k.-vi-e(dz q6-kh+nt 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 connech r4+ x*2f i4wyfqapx7ual227,hpd ycted in series to an ideal battery of constant terminal voltage. At the momai 72fdaq4y 2,ruhy4xfl+2*whc7x ppent 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 sqb l*8 8+yzg px4.k4q q2rcamv hb1c1xeries to an ideal battery of constant termi 4*xxr hc+gm41pzbyqav8.qbc1 lk 82qnal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancez 7d4 zzez0re; R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanc/baswud yut9wc:3szz6c+2u u 8an;2pe 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 klka ehl;ox3yl)r9g 6(yrb5y8xzq,n65;m cteries to a battery. The time constant for the circuky,6x8 yznxh t;r3b 65a q ;l95(mgcolrk)yelit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t8m+ 3yls*x7(dkcf a sbo a battery. The battery is suddenk*cd78 m(xay+s sf3 blly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the u ,d+iad p4. edoouy.+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 thisos dy,v p, ;*t6zsm.pm 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 conqo9 9v6jq h u+9ygilcu9f lv)5nected to an AC power supply. In this circuit, the currentiv6u9+qluoqyh9)59 9jgcvf l

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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 the frequegk q sgmum0 mv8011)cahh4yw 2ncy is a 18 w4hmumv h0k1q)0ysmg gc2tripled?

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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 doub/zsyr ov;t+bqn)2 /vw)ek9g s led, the inductive reactance of that zt9vy/)s ;bnrqeok/ )2wg vs+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 inductoaqp rm y4 l/5 lt.8f4.ufdy)zqr approaches zero, the inductilq r. u f z8qmytfdal)/4.p4y5ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In)(b/uefp;go d this circuit, the curred gf/ob);p eu(nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changejx6tg/hypa - 2s by what factor when the frequency is tripjh g- t/2xp6yaled?

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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, the carnia0 x h)uvcf2,05 *wwhkn8 ppacitive reactance of that capacito0iac5x0,n w2u*)n8fhw h rkpvr

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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 betwek uh-0+kgtq/zr -kr /pen the voltages of the inductor and capacitor in a RLC k0quz-rr t/ pk/-+kh gseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is -6u +v3ncsyh08afryj 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 circm8uc 4s;w,ybi uit. The impedance of the circuit increases if R increases. When i usi,4cwymb8; s 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 circu njtbdv ,(e2bij5:w 86m v0dtxit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of tz(t cujgzui2;k,7 0y phe circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doublekmll*2r o a/e0 in an LRC series circuit, the resonant frequency of that ci m*olr/ae 20lkrcuit 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 app,9 dw q9+(oxebc3hfoilied 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 ci;p 3w2o1ljz gb+d8ke qrcuit 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 m is rotating ihv31mfel/ lrbv/(2y 0t omet2n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when 3r2m/ 2ml/th1yvelv e(0b tof the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform maglrla yf9zmac**z8i ag l,inp 7y; +vxzf55 +8dnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of l*75;imgi8vzlc+ 9z *5ay8rady+ffxz npla, 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 in a uniform magn ecsi6f:/ ff; 0/ n)y0cbupcp gid*0bietic field of 0.20 T. Find the magnetic flux through the loop when the plane of th cf/bde*i;s 6pf 0cipg/n uyf:)i0c0be 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 s lx(6qj)d/v)fym/ow o ingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chan rta-g6sxp7, ya7osi/ges 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 yg+blb fue1fad; i1e;9a 9)ybframe 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 vaiae+ b)fyd 1u19;bel9y fgba;lue of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns anosf8+/oc1w28 k twdt pd 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 ad(qqgs ,b5 67 ztf4tedrea $0.20 \; m^{2}$ 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 auot*vp ;;rccky7 o,8x location where the downward component of the v; xu8,tk7cr*ooy ;cp 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 constant (+ae2ty)goa: d7ftd e 9 olh)k6dbf (78ojeqfangular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mafo o8hf)+9okqjdte( 7gt a6):el2yd7abfd (egnetic 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 loo9+guz pry/cu*rq ,pb:ps 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 areacrt v7u 5liki 2uo95e7w+a2i t $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is n6r u,1 --vo dibbucc275jhs w12 cm long and 8 cm 67bdc 5s,on -1wvicr-jh bu 2uwide. 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 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 turs(h*jipb,fi /ns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with ano4:bz9(,6tauauson:k 4bgcd i sv14k output of 12 V maximum when rotated at 60 Hz. A magnetic fiek9gno s vo4ua:ua44t b61,zc(d sk:ibld of 0.050 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 generator wy 4 s2pf5w*iihith 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 operates lqc jm (gj1me 2376vreon $120 \; V$ 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 motnloo.n2-gudw )jky 1qan g) :7or operates on 120 V AC, and when running at :nngj a)1g2dukqy ol 7n)-wo. 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 1y ;gwmsz8xd v+-*yd wijl6m(power supply. The oper8-d ;16 smj*dm+vgi ww(xly zyating 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 resistance 6.0 W is connected to a 24-V poweruwod)3d ceqsa) qb950 supply. The operating cdquq3 )edc) s 5aw9o0burrent is 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 power supply.mrdk+7wme it s*n/eo: :z6f -d The ope+wsedzei6*/n:o mt- mfdr k :7rating 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 aqxlv3i lf)3b8 primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer cauvcq: k 62 kcj 6o/pbcnx 2s4fq:hzv14uses 14 A to flow in the secondary. How many turnsqv6p x/hc2cs64nqckk1ou j4 :2:z bv f 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:o ; d5sx;z6 nbiw2xcx many turns are necessary in a 110-V primary if the 24-V secondary hixosw2bxc:6 5;d;xz n as 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-turn secondary co4cnh7jdwz nf-xi m24mv.n :s *il. If the current in 4*4dnv wc-h.n xz7 2nmmif j:sthe 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 transform xd.)4icxdos )er. Assuming 100% efficiency, howi sx)dx).c4do many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 g-l 7fk p25w 9qk r3c0opvywp2mA. The primary coil operates on 120 V. What does the prk3qkylw2g5rp209pc wof p-v7imary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andhas,yj+03z t f wnj6p, 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p,j w s y+0j6znafth3,primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns onztzb,h i .m gdf*30/ix its secondary coil. If 120 V at 2.0 Am ,btfi z hd/*3zix.g0 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 turns and its secondary has 200 turs , bfogcedu)5 w8v f9snu44 /hhcf*wj5qex;-ns. If the input current at the primary is 100 A, weecu5n4g f f w;f *jx4wuvh-/d5h,s8c)q sbeo 9 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 anys/ix6- m :yzad its secondary has 200 turns. If the input voltage to the pr-:sy xyazim 6/imary 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 secondary h *x6orxn0tnmqy* 4 lh8achzbo.rkm64 dtp97 7as 200 turns. If the o * hltor7khdn x7.a6xnymq6 c4*z r 94mt80pbpower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120qq sd2j:f9;ip2aq c8g po- r zlvt6*q8 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line o q-qf8i*6sqr2qp go8 d2vap;9tjz l c:f total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step 57+utrfgsm1uped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find th1grtu7 sm +fu5e 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 currep-yr9hmy ; gfb21jzx)nb**pb cmc12 dnt 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 Wr- b cz;h*fbp1pdc)2g j2bynxmmy19* . 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 ka+1, h1ghgv xq1u:+xjlt1jg f.wj li ,m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to re 1 :,l jqux + htf1,h1lavg.xgg1w+jijduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 gene se pki)exx86u7d() nsrator 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 when the transformer isedxiuk7s))(ex8s 6 p n 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 le 16rmjr -1e gh4ly9gkqss power would be lost if the power were transmitted at 3000 V insteaj1r 9e1my-lhqkgr g 46d 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 is83;lk n c sh)p lebol5u84(gfl to be 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 los)o blk ncfel8; (h8pgl54l s3us 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 carrie, d49.wrcf4 2rsuujv3t z/yhts a current of 5.0 A. How much energy is stored in the coil's magner34c 9stywh .rz,t4jd f/uu2v tic 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 im;fq+hoo9azo9 k6v)ss )z au3nductor. What is this circui+39uhaz)) 9qs;ozkasv 6ofm ot'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 anw5lx *h7 fz-nq AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curt jc8nr* /+wdgrent?

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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 the resistance owf1 s 2j*y/ )lfp/2y(mnqvo cof the lamf snp y(f1coo 2*vl/yw2/mjq)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 ack7( x:6zyvw rp)puj3 u power supply. What is the peak current thru:zpr3pxj7k ( 6)uywv ough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whatu ,wk5c9z :+ei-gh9bg3z kaop is the power dissipazi egac - 3kg+ ,9k:w9puzobh5ted 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 resistormk21 j 4akdeu2mzu z,q1:v+tq 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 4vb d8*4xtxhc)bfs y* 50-W resistor 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 1xe4p:- czmfej 4q2t wis $I = 0.80 \sin (240 t)$. 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 ofw75l8aqk h i6ab(3m3 /0-crxxcgvkrl1o/x jh a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 ;o2uasd.u+ 8nlf:c r vHz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive e:yz30vjo7foa4ea 8 m 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 k-:v41/jaqae m*pg kqh8vqw(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 (o c rptif 967+/pmx:v2e5 1k dyeawdua 60-mH inductor when 120 V AC at a frequency of 20 kHz is ap59fi1 :t(oe2wac/+ery dd p6kvx 7mupplied 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 (s-qpiwxifcc 8l ,-r-j 9p9 pjthrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactanc2sxt4d(lopp9fm(yq d 4 m5*xpe 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 di5vv+hot.s :.h/yv*q rx,e aof 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 cycqktx 4f 4guj(u/re*bo 61 )z:zj5 buapacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF caparuf/l1an:v9s ,jv)fvq73ue0p,nn a scitor be 100 W f3p1sa v,qnnve/unu,j l:0s)r9v af7?

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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. g4zfgf0uu;.) luky3 b0010-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 resistance, 15.0 W in2m fau4/ oz67 ybr8bja ,:eibjductive reactance, and 10.0 W capacitive reactanc rzabjimjba/6eo:7u 84 by, f2e?

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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 coil, apgfya/t w6.2a;wkwdu5e.qap m;-:g h nd 1.0-mF capacitor are connected in mtw2 5/w-6.huagk .ae;;d ag:wppqfyseries?

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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 Hzm 6kmfz*+ nlz zc2)f+n if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecz+m*fl z)c6kznn2+m f ted 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 et0k27xa;by j a 20-mH inductor, what is the i0ba 72jxkye;tmpedance 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-n; j r-+im7h/nz q(-mlzz3dwumH inductor, what is the phase angle at 100q3-nj7 n+ ;w(mdizzrlm-hz/ u0 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 nee 4b- ye9if;e9ru ck,rlded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total 4cbkiy9;-lfure9r e , impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wiac5v t8 zl8us4th a 100-W resistor and 15-mH coil to get a avul45tz sc8 8total impedance 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 xyu9q.y8x2arml8a1dput in series with a 450-mH inductor at 5000 Hz for a to1.x8a8qdy9uyr2 lma x tal 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 seriesi(2mwlxk .7 it with a 100-kW resistor at 1.0-MHz for a total impedance of 15027xw ti m.kil( 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 k5tshtw:a6ueqv *w) wct.x1+ is the impedanvq1tc6:xk +*tww.5w a)hstuece 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 y ydi8 *gt+m4f10-mF capacitor at 1.0 kHz for a total impedance of 45+t*ydgy i4m8f W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1 -wdqrpgl+5dl5e3 1x: t5gq nt.0 kHz for a phase angle ofwq g:+dg5tpnl51l3x-dre tq 5 $40^{\circ}$?

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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 wit .)ssdk hcn81)hfvq/yh a 30-W resistor at 1.0 kHz for a totalvcs) k) / s8.yfhn1hdq impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the s0z/u2- tdoz 3o3ysjf2yhig( phase aotoi 2z/yzuh gs(-y 3fj203sdngle?

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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 f b x t,czrw0l9ly7m.5skbv9lun kt*a d(3-0da 100-W resistor, 20-mH coil, and 1.0-mF cm(bc bklt*-fd.ay9txz kdnu,7lvwl503s 90r apacitor 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 10.5tvu:7lxh 8.g /83dngh( o gokv5gskt0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supph/svggt g:k8 ooln g(3.vh7tx 5k8du5ly. 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 anui/p7 ,4 oszv39crp6 pp8fabw inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flo,63wz7p c 8i ou4rf9pavp/ bpsws in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containajz7u9 y- l1c.s +ykaaing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn j ac -a.9lzay1y+ks7uected 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 foqgc47knh *r y09rqt7 jr a phase angle ofqjgyq9 nc747*rr 0thk $40^{\circ}$ 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 Wpkwd 8vl29 6gw, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred frow kl 2dpw6vg98m 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 resistjf) jot-gof : *a (;xdcl8(tsuance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn:o (uxsjf8c lt;fg-jd(at )o*ected 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 kmqd/ it r ow+e4b:99ris $63^{\circ}$. 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 x ue j,gax+qk35((o zqresistance of 30 W. What is the pxu(q x,(k3ag+ qe5 ozjower 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 ,qpsj99l is 9gsan,:zseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ,z9s ls :9jaiqg, sn9pto 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 fi ;rhav-nd u+eem9e.:3d4xain series?f ae: udd h.i;nm3ex-4r+e9av

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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 capacitor j7+ znck1 rqvs z0rldahe(yy(e:1, - mfor a resonant frequency of 1(yhc(:1d0sq zy,kr le jz nmr1-e av7+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 n1v:q s5bont* geeded in series with a 3.7-mH inductor for a resonant frequencq s5:1tv*g bony of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series witggqqt h n0 pu*bz)h045h a 30-W resistor and a 40-mH co4gqt *phzq 0)n5ub0gh il if the resonant frequency of the circuit is to be 1000 Hz?

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