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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 qb seohn)w* j ).a*eqh+q1wv, are 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 inducz+)w7a v h.s knd3ww8ztion 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 c * 3j.gvtymf(tufi;m6oil produces what kind of change on the induced t f *.tmyfumjig;6 3(v$emf$, 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 fi156*r3)g w bg7y o etdq o+jpbun(pqp5lfm3 :leld through a loop of wire produces what kind of change on the induced o1(re6 qndby f*g)jl:+plq5 pumg3p735bt wo$emf$, 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 wire prat1vd8,g;ch8t8n (3txe7tr :i cu z/sgiu:txoduces what kind of change on the induced81:zsg8t;tt a, i:t 8ret ncivd(u xu/gxh3c7 $emf$, 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 az -j.xc dy 4)ipc-kqpf;q/ wk- magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction nm-5;d;tomkv of an induced current in a conductor will be tht5o- ndvk;mm;at 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. A bar magnet is held above itd/ 4o9a2o eehms center with its north pole pointing down. h2 m9e oo/dae4 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 table. A bar maoq( 1nuj:xq5 bgnet is held above its center with its n(5q:bu1 q joxnorth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where thnr+urx-.pp m* p0 h/;tq 1eqgwe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this cx1e h+*/unqgppqrtmp w.;0-roil 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 tablec 9 g3n.16gyyvjo;zzoa; yye0 top in a region where the magnetic field vector points straight up. Tyzya vyjz;o0c1 oeg.39gn; 6y he magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where :)fka)qz(w 8hr nwgd) atn (q,the magnetic field points straight down. The magnetic field disappears suddenly. When vie:n )8z))da (kqfa(wqrh,n wtgwed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incrre tt9ksf czwrb 580q;(- at.yeasing current northward. Two swf qb(-k c5a.90r t8etzy;rtcoils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nor ryt* 1au2+inoth pole entering first. As the north pole enters the wire, the induced current will be (as vit2onru*1a +yiewed 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 anw5(h ed :u ,mx-*j2wdd)ayppogular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientadwwyud d:5m-,2x(jpo p)h*aetion 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 speed abouta fbhrw ;ep;ou:p 340e(avsy* an axis whose direction can be varied. In a region where a uniform magnetic field vpy ;eupra :h4e* (wfa0b o;s3points 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.fjnoezpr*7 hl) 83*od2v o1 r 0f/wyab
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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 aa-4 / khh2ykjhca bif25b1je; n $emf$ 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. The;y5nbd1macsrx-8p /3q xsb:h $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) ivnsw 04l sm(i;ca *3gf 9:onpes moved northward at constant velocity through a magnetic field 3o0fnp49 m(:l;nwavesgi cs *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 constant angular velocit xnu 3 :5xq pp9rdk/1z2.zickcy $\omega$ 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 transfomt-/gfc7 c5wp 9cyz0j rms

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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 fr,k c :avgo ns(vi.6j*6xch7fxequency of the 6nxxk(o .v6c:a7c*i ,vhsf j g$emf$ 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 devi5la5 (3j go5 u(j e27 e7nphaimowy;nzce 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 device thq)y)xcm k4sai.u 5gl 6at

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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 lcoo8m/s 8d.ba( -xozzoops than the primary coil thb-so(z 8cdx 8az.om /oen 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, ifofv;k 1 +n)dp2gj) mwt the primary coil contains more loops than the secondary coil then it is a+ndjf) gwm;2okv)p1 t

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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 6u9h. vx;:w : kzjtonjinput

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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 circ bkqc uze9 f0+w*xnr /e)qqt73uit,

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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 ideal battery of bh 659t6maa oakdh86 dbkn+adc2m4-rd sb)q 5constant terminal voltage. At the moment contact is made with the battery, the a2tb-+sh9bk55kd ndhaa6mdamb 664 8 d cq)o rvoltage 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 b( vds*uhxw fh(zk8f 4t*pth63attery of constant terminal voltage. At the moment contact is made with h8p d*f6shx4tztkwu(*f h v3 (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 :5df xbd4i)c ;dw)vt0 -rb*orjfngi6 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 with inductance L and resistance R is connected toig qu l+(i9n bwy.8vt .rqmm1. an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti(vlg xg/u-orwe-v9 v,me constant for the circuit represents the time rerl-vwxe/ gv-,u9g o( vquired 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 connecteybt(snf-1w cs/6,srcd in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requicsc1bwn-ft, s( r6s/yred 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 same uni7xow 7wp0(xp k;)pjmx ts 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 sugr9: fdm,g)o jxn/g :qpply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the ciy3jbkw(38k-zzf r1jfkz/b 7 urrentzr3yj bkz7k /k zjb3(ff iw1-8

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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 w cs q)vu35,pq:tea;0 a+arcn6fmyv;qhen the frequency i q5aa,e;+q0 rva )mtp;sq nu3vfycc6:s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, tr35nby2w2di :4 gmoc:by-lx the inductive reactance of that 2myc :wobb2xnd5 ry-4g3i t: linductor

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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 approachec;m f0sd/b5n 7 9tls3yt,wv e ,rwi0vas zero, the inductive reactance,diwm cts3 l 5n0s,0y;9 af/bt rw7vve 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 )b1taii7-vnrni r: e4fu8wz2 to an AC power supply. In this circuit, the current:a r2vbw4ieu1nf87zn ) it-ri

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react2y 2ix5yx,uvc ance in an ac circuit changes by what factor when the frequency is t2 vxiy ,5y2cuxripled?

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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 8j0 le4p d ohne1m1q9teks;-f the AC voltage across a capacitor approaches zero, the capacitive r8 dth1e4pesnml-f1 oqje0k 9;eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the volpe3i3q z.xt s2sgy6 .dtages of the inductor and capacitor in a RLC series ci.ts3qgz6 e.xpy2ds 3ircuit?

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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 a/ qh.-yzs6p -l fgkqz8s $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increase a 77jt3m/dulqzpl mr2z).1c as. When is this statemm2)l7.zdt/3 amjlqru p1a cz7ent 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 circuyyzl2od;k;y s5grd ( *it 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 the cirr cvi tg4a24n4z:n oq.bzpj:ww3:l s8cuit 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 double in an(bapt;jh58b+ aim +vi LRC series circuit, the resonant pviha 8j;m(t5b+b+ aifrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driv82qgf gsprzjw; 1qu( 2yuuo +(en 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 circuit+g6gu4e izw3k 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 in a un 2h e f42(7df+tqgoxlsiform magnetic field of 0.20 T. Find thx f+f24o sq l2(htdg7ee magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating ineo58x rx 1x(gc 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 perpendxc5 8xx(ogr1eicular.

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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 magnetic field of 01 aprmawir.) h/bd8v 0; v-wgn.20d/)g8 -wr npv. avr 10awihbm; T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redus.qojab* nuv+pj e-/4)ho- hzf iw*n: ced 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 cb:d ,y12djs ofr r1y1fhanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 1()jfvfb-feh/,q j; yf8 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/fbfv j-yq (f jf);h,e value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turnd,(nwc5 x,a uks 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 arej rrplo3+cli if27f5x0t9 (sc p-y2oh8xt y4 ua $0.20 \; m^{2}$ 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 hor3svibh172ag+u xi5y c izontally at a location where the downward comivxb5u2sg7y1 3ca+ ih ponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant anfp1bjl6w pb60 z6ctd:gular velocity of 2.0 rad/s about a vertical axis through one of its en lc6db1 0b6:pzp6wt jfds 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-sectional area of t4t-s q9zel 0w$0.25 \; m^{2}$. 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 of2mrrb.hn)y ge r)-uu; 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 laaymx3k5 3zcj f -w9;toops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis para;x3t y 3ajwcm5 k-faz9llel 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 /vk tu(fkfh6)8-xhlc turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 1ggx,u xza85; bgu/x4h2 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T u;u4gxhg5, z/xb agx8is 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 wr ld+51bqee,gfd/ml fql 46ljn3 zc47ith 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 ode+bx i b-2x+an $120 \; V$ 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 motor operates m:v u*e2g(qyw/0 ehrunfjt9/sas7txqi / g:1 on 120 V AC, and when0:/92wg tq sgfrt(a yu17h /si e:e*uxvnmjq/ running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conneb)l 0gn 5/kltbcted to a 24-V power supply. The operati5) lg0l/bktnbng 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 powea5wknqw.0udrrc ph 66 ib1 9e:r supply. The operating current is 1.0 A at.5 a6 rkhu1eq0:ipc9wwr6 bdn 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.,h,1rlhfn5p95ceyh g y5)bcw Thenr)g wlhp hf,5,5h9y15y ccb e operating 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 nryivfyo- uu(i9q6i.q h xk(1 2eeded 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 tra-:b: ,a hwm4 7gpmpq*hcz3c.tux vt7lnsformer causes 14 A to flow in the secondary. How many turns are in tcp.m awzq :x hut37,4p -btcgml7h:v*he 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 turns are necessary in a 110-V primary if the 24- yj058 4yuvi+7scg2uf x 3dtxfV secondary has 100 turns?f 0u782jgxyys ftx4iv3cu +d5

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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 cog. weww4* btt n 3fn*no-(rj1lil and a 2000-turn secondary coil. If the current in the secondary isb4-f nn*g(* ew w j3tlw.orn1t 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 transformer. Assuming 100%obez*uf37 k6pm qo 9:x efficiency, how manokuf mbp*e7qz6x:o39y 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 proj,w 48wz 2ngt s qpcpy*b*ugv8q2z.6qvides 7500 V at 10.0 mA. The primary coil operates on 120 qvszg46yjc zgn8q,*.822wbw*pt u pq 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 has92fpjm e ,wobie z..e9 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0jb2m.z9p iw 9.,eof ee A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primaryt6 kffe9/m. (c8ysav q coil and 300 turns on its secondary coil. If 120 mkf vcsq9y(a 8et./6 fV 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 turns and its secondary hai8g-e* n)mdy9 sbh* tinjm *:ws 200 turns. If the inngm*9-** jeb hi8: dsmw)i tynput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turncu rd y3;cg89-rk, ekuu -fx0zs. If the inpu0 cc3e8yruzg;kk -fx9-r,uu dt voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur89 t/zz5 v/ ex8ir0mkz zmvxd*ns and its secondary has 200 turns. If the power inputzxvt e/5/ zz*k0vm8d8zxr9mi 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 120 V. The voltage is usually steppedu:1u+,,ni cg evmpd)6akpl fibb/f12 up to 4500 V by a transformer and tr2fi :u l61pb1acn,)uv/,b km g+dfp eiansmitted 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 b+s+ ex1k (vxe60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lins+ xeek+xvb1(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 qs 27/sc9qajm stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission linea7/2s 9ms qcqj 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 resistance of 0.67 w2) -a7nfnd1n:ndqrci 3eeb0 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio ocedif3ewndrbq n71)a: 72-nnf 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 l 9g 1qi.x/oqvof 0.60 W. A generator produces 100 V at 70 A. In oq1ov9l ix/qg .rder 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 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 lje:,uxu /jxa;twu* 2h ess power would be lost if thee */tuuju,a2;x: xj wh power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line w z porglmxy6)(o 8 r6z,; rnmw)c0(zuxith resistance of 0.60 W. To what voltage must the generator output xo6lzno,y r;)c( pz8guz0rr)m6 xm(wbe 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)grspu7i eg g 8(0+zy826yq1zbwdr h k much energy is stored in the coil's ib(d0ey7rs8 gg1kzwqz6h2p)gu8 y+ rmagnetic 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 co 0ee,fv.mg)y ih 7j/ybntains a 6.0-W resistor and an 18-H inductor. What is this circuitg,7ei0e jb)h.y/yfm v'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 where the rms voltage is*jv h y ((:bmuvk:f,cm cd.p.s 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 a t(avz 8co8u43ec)tq into a 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. Whati d;6) 6+g4g 4ll:vo-tsfjl xstsu7f f is the resistance of the lafd o6sll4s67lg ttvx )4g-fu:fis;j+ mp?

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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. W*ip4 n.t)b ga;wb/d gmhat is the peak current through the resistp w4n/ * ;gbdi).mabtgor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dq3v wpbqcto+ rgk-q.d 6 0cx-1issipated in the reqvkro6c 1 dg0q+-3b -qw xt.cpsistor?

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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 resista magaoorhfig-6 5yf)n7* x7ng . (0kvor 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 resistor i6h9vcr)rckoe* me+ ,wr .ovh9s $I = 0.80 \sin (240 t)$. 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 q+ txa3y7d ycqtn53dcf-3u)r is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.6qpah41psye o0cbd u 6,*v.t an(y3cn0-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 n -(itodk u2r-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: h3aoxl l3f2ldmu4k :-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 reactance at 10 o*(-8ekut ut9evj*pn 00 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 au)cyfj)z6n9y.jx 4blukc0) of 20 kHz is applied . 4zjcuf9yc n0)jlb)xka6)yu 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 thrqug11 ) d11za-tqg axjough 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 reactance of a 4.7-mF capacitor at 10 kHz7f dhkq4,k 6ro k+qmomrx3zj8 n45q8f?

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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 readpi is1bdn) bx 2mrre+q+ b /;/n(z:cfctance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactalumy+ok334r 3ib1i pv nce 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 capaciccp 1oc3v5 afl*m ri9*tive reactance of a 0.010-mF capacitor be 100 W?oimcal9c3 *r*51pcv f

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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 0.001c8culk/cdc b kq*9 u/v*- yq:w0-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, 15.07ks0( 5h7j vp;wyprgv W inductive reactancepr(w yp5vk0s;v77j h g, 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 impedance at 1500 Hz if a 100-W resistor, 20-mH hl* q0 r., td1)mpxfuozp48y ecoil, and 1.0-mF capacitor are connected in srhu1 d) p,ey.8ozpm4t*l qx0f eries?

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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.x) u.t80 82lqty,rnwhtj-; :jgr daxc0-mF capa80l,t;a y )jn qjx: t.r2cg 8trdw-uxhcitor are 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 conn:n.jj:y,z8e z a j*nifected in series with a 20-mH inductor, what is the impedancej,j jnea8:.fi*zn:y z 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 conn2 gab w/jx0tm9 pjoc)-aoi)a/ected in series with a 20-mH inductor, what is the phase angle atb 2/ao)cxwmga jtaoj9ip/ ) -0 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil2z p;qjjx,p:k and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hx ;jz: ,j2qpkpz?

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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 sim 8w wz .0pk297u(, odb y8ajebv8mdreries with a 100-W resistor and 15-mH coil to get a total impedanceku( wy0b97m, ad2obrzpvm 8.wi8je8d of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450s/1dsjk1i.kjcf96io yggb8 83sg (kr-mH inductor at 5000 Hz for a total impedfckk j bsj yg8gg9/181ksoiid3(s.r 6ance 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 seu q021ezr:xh mries with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kh m2x0e:zrqu1W?

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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 seriesw qdkp/ .na7o8 with a 20-mF capacitor. What is the impedance at 1/p okwqd.7na8000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a totu2pzd v 7j: ikrl8lp.*alpl .*pk8r v7j:2zduli 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 10-mF capaci eyly)6few6;z;a v- jdtor at 1.0 kHz for a phase ang yl;;)6z f6eavy-djwe le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor a2grnc,4 if/ k y9mlib4;kw t1it 1.0 kHz for a total impedancibyicmk2;g1 n,tl9rfw 4k/i 4e 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 wikqfoi0-bx. 3k;gcctg..: mweth a 100-mF capacitor at 120 Hz. What is the pha gbki-;e.x3kg: q.ctfcow.0 mse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1: di50bgb) epg500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec)g e5:idp0g bbted 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 consistsow0t:j; yi7m0vns u4w of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current iniyu7t4; 0:wojnvsm0w 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 reo qa,ql4 wk:5dl/i*z wactance 30 W, and an inductor of qkaiwo5w/d :l*z l q4,inductive 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 angla6q( p0h5klgh e for a series RLC circuit containing a 50-W resistor, a 10-mF capah (6a hg0lkq5pcitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle 4jfa3.oxs.z o3 eq* *bg )jdeuof xdgou)4 qz.b a.j*js33 eo fe*$40^{\circ}$ 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 wha5 y orty 6qjuvp5ir, z:c*yc:7t frequency should the circuit be drivju5t zyc6pqy*i,5cr :v :ro7yen 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 12.0 W resistance, 15.0 t *n xx+u,4uyxW inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a u+* xx4,x utny120-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 mxjbaqklb d12 .bj//00r*u3u lf* hxiis $63^{\circ}$. 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 resisr p*d3;thahf n tw-x3a65kn .etance of 30 W. What is the power fac3a d*hhpwnar5;e.t k3 n t-xf6tor?

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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 s w (;(ri zs)h2hyohz-yeries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect2hih wz(yy(ozh-s) ;red 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 coilg3(-x4eopsb ce yv,/ q .htr2u in series?34ct2guy. e -r/pv,e bxsq(oh

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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 sh*f 3k,z th/ 2eymamd)eries with a 4.7-mF capacitor for a resonant frequency of 1t)3 dmmk f2/z yah,e*h0 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 i -j jt08et4wm80z a /bu6dmpdsn series with a 3.7-mH inductor for a resonant frequency oub4a8 0t-/djtjdzpmme 6ws 08 f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-9 z. n9ccvj2i0er 1q:h jsqr.umH coil if the resonant frequency of the circuurer2zq90.ch9.1:qc ijj n vs it is to be 1000 Hz?

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