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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 magnetic flu:hu)4btrqp5f)q)wg 4d5 lc)uv:vkb ux 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 state y 6g2-/:oht ivesb 6qr8nlhk2s 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 ad qn01u nuj31a coil produces what kind of change on t1ja31q 0n nuduhe 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 lku; o 4 -/f0vl,.wdtt:sxb j+*ewajmvoop of wire produces what kind of cjk/-.evltu,v: xwd*m4 w o0j+tfsb;ahange 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 wire(auo( 7-bkzmg produces what kind of change on the induceomuaz 7b-kg ((d $emf$, 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 udagdronq b4 4)od7u30(q-cr from a 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 direc4fk3bbq zaj9 ;tion of an induced current in a conductor will be that which tends to produce which of the fqk93b jz ;4abfollowing 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 4m3w9lt/ljqkw.g 8tybar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewedy/ l t t4gmw89wqkj.3l 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 ab9feb i-f5 znb,ove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces-f9efb5nizb , (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fi+bx syq)s2 6koeld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field 2oyb+q)sx k6s 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 tablex d8q-n1g5g:dk 7 ;n bljfdo0q top in a region where the magnetic field vector points straight up. The magnetic fieldn5go:7 dd q0-lfdj81 x ;bkqng 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 rw2fdzu.7 .xyyhyu/n * egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field 7u hf 2/ zuyyy.w.x*nddisappears?

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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 carrie3 b l msaqd5ap;l*c grs15w,a0s 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 d*q smpgsawla;b3c55l0 1a,r, 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 l6alhtrk 91gdc-uk*s .pe 5 *fjoop of wire with the north pole entering first. As the north pole enters the wire, the induced -e.1s*jlg5pu *tcr6 fk d9akh 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 speed about an axis wx:q 3f, boj4kt;y 0 36rjvat8sgp/ zjr6mjtl4hose direction can be varied. In t/p6,rlq34 x kvygf6t4j jaz3mjbt8r o: sj0;a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constc ) )muw.pp).j0a+dwf jva7l mant angular speed about an axis whose d0wld u )v)mjajmcpw+ .7)pa.firection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.8 j3hauin5o1y
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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 thag yc; 5knwiw;:t 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 field. Th 3au56cy6yjn me $emf$ 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 er g(3jqwt -*spast-west direction) is moved northward at constant velocity j-t (w rq*gps3through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constt h8l24c06-folwh emv ant 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 transfrt8 -gr)v nh h:x:y)dqorms

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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 frequenc 0 qnft-dfwf((y of the f n(-(f wd0qtf$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used oj9 e,dfw9t 5fto

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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 thag,2atilb+ufn 9 rm4y( t

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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 loops than the primaryqt snaq qo,m6);knsnfe-3k zz8 j6;1s coil then it)nzq3o- ss s6 e jm 8t,nnk16az;;qkfq 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 tqi.; 4co f6ani6.5osq 7cgmnlp:m8puhe secondary coil thecs667 n;.momlinq u5.fo8pg api4c :qn 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 poweufbjdzpze2 e4)4 0+ nfr input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant *3 ehb u3,kshk z6c*zycircuit,

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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 i uf3 +9lh(fuoberx+ l;p9 :ivjn series to an ideal battery of constant terminal voltage. At the momen r lof;xf+ :+e9u( li9phjb3vut 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 inductv .qwl)l9l+woor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made+qww .9)ll ovl 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 indu 1*tk v6x8kfshctance 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 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 to;dlto z. 7 dc0gboe71kvhy.cw.p j,o0 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 bww ufme.7mj8m6u) 8ylattery. The time constant for the circuit represenw)ujlm f8 7w8uym6 m.ets the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The*1u *d/wgu dkp battery is suddenly removed from the circuit. The time copwd1d* k*/ugunstant 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 same units excepo975 xoy kl0c(j.v uj6vh2, 5vnpjrh 4azc*yot:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circu5hi h8pc7i8 6t9sqeubit, 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 tzhu:o2 f+w0 hj 6 ncfxl9w/8/tz;nsnehis circuit, the curren j92f8zu/fnwxh l+ s ewn;t n0cho:/z6t

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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 frequen x e6x j*v6enni:*hh1zcy is triz *j:xv* ienh1 n66xhepled?

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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 acro1,- ,h *drm daufym tzn,15iznss an inductor is doubled, the inductive reactance of thn m1 zruyzi5hdda,n-t, 1f *,mat 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 acrossvvd g.ne8fl ,pvs sj5d3k(/4o an inductor approaches zero, the inducpkos , dvlvve3 dn4(f/ sg8j5.tive 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 axlzj*n7 k:b*rn AC power supply. In this circuit, the curren: bkxr*n7zl*jt

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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 wha8rtvs+qr;fzjg s :) x:t factor when the frequency is tri8ft +xrgvq; sz)js r::pled?

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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 voltagehzb1r d08 jebdjo:(r* across a capacitor approaches zero, the capacitive react: dbj0jrzrb1he* ( 8odance 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 voltages of the inductor and capa1cgo+o* wnj5 b a(ezbnw ktf4 1.-ry0dcitor in a RLC series *b gtwdn( k-foz14robc0 j1a5n+y ew.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 is49 .fajhu akt:.fgs/ g defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incr8qrr 5x7v.kxv eases. When is tq7v5r vk.x r8xhis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increas(+ 65itd-y8 lt bscsepes 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. s3tp7u1m p-fd The impedance of the 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 double in an LRC seri *pl ,6lrjnzk*es circuit, the resonant frequency of that circuit*,6 rjkn*lzlp 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 a:0gxasje,/q/ v2 kkxtpplied 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 occurs3jx.75gx9q yqe4 g2s4;qxf eq h ciw6c 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, jwr-ca 6*8 gcjw6kcgy7xvw,.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux tw akw vcr,j6cyx,g6j -*c7gw8hrough 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 in a uniform mt/6 c 2hpn.p0xfhr qe)onwk0j6ej6 z 9agnetic field of 0.20 T. Find the magnetic flux through the loopx fj6 0.)tqo2p jncep krhne9wz66h0 / when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m isv+io +c, 8gxbr rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneticr +vgx+8 ,boic 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 1v- 9i)pmuw 3wg; fbehreduced 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 coi+hk8**5 dn ue i vvwb1ph51tihl changes 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 aeortxh +4.9 kux uapj; .j/v)200 turns of wire on a square frame with sides 18 cm. A uniform m/a .h9+;a )4jrx. uktpoveju xagnetic 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 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 n+bqb9a) yu p 7mr0m4o15 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 ano y)s*x/7 8bl3szac wjd area $0.20 \; m^{2}$ 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 horizontalvcn9 kr6ttke u,/qk)g2a6v2aly at a location where the dovkegtq na9/266a cr2) tk,k vuwnward component 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 ade k1jv5.h+-:wxi, ue gl3qw constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whiiq 1g:5xeek,.dwjl + wvau3h-le 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 los (yu/lh,a)wmx .n ak7ops 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 (yf:l/, to-g5 2gi+ibmk juuoof 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 loops on its armature. Eac2l2araij vgmp2dx p7p.w480wh loop is 12 cm long and 8 cm wi204d.gmwi27 l8x2a jpwa p pvrde. 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 turns of wire of area mzrnv4x20x +ly/xo2,fstpx2 $0.090 \; m^{2}$ 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 9cz2 jyn1 4c94ciafevl ,ocq6 generator with an output of 12 V max9v lc,6cq44 1ifanc9 ozje2ycimum when rotated at 60 Hz. A magnetic field 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 wio mvp9+vepc 7bc :-xp-th 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 havuobp-1 4m.s):luy0+a oakiha e a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC moto s.8 p,*lrk;t54 ps(vsgreaau r have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full a8.s,veuarss4;gt5 p(krlp *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 porr.-w 7r a-0jp ktg0gvwer supply. The operating current is 1.0 A. What is the start-upr7g- rtr-w0 0. vagjkp 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 power supply. Tf) i;i ;hz0 prxf s5wfty4)0bihe operating current is 1.0 A at byfrf;0ih z4w)sx5t ;ii f0p) 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 ,q/pmj f4 bg1eem+7 iq ciw6a.a 24-V power supply. The operating current is 1.0 A at full speed. What is/f pqwe 7,q4ij em6ba.icm +1g 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 redu h(rkwnq +sr0d* gr30qce 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 tryb7r5 lbo- b/,fzzbr;ansformer causes 14 A to flow in the secondary. How many turns are in the secondary?l7yo-bb 5f;rzbz/b , r

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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 primaryq,z pc,5xa 8ub if the 24-V secondary8axp u,cz,bq5 has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 5sm-hrdb5mhxie+ ) l5-00-turn primary coil and a 2000-turn secondary coil. If the current) sxe5 hhidl 5mr-b-+m 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 transforr x5f7;fgsqhrrf* (e )l1csfz4)-wcg mer. Assuming 100% efficiency, h5-f )rqwclscgs1) x;z g47 *rferf(hfow 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 mori isdw5) r0:A. The primar5 ri:dwir0)osy coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has byfn.1 ma88 sd+ajakzl8q)k7 60 turns on its primary coil and 300 turns on its seconda8adml)8 k7j1z qf kna8.s+yabry coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primarov y-hs dllij64a47z ,y coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the paz4yl d7si-4,6ojvl h rimary, 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 tur7w,d +b15er01 oy2gyhs4aa+jj r sn qvns and its secondary has 200 turns. If the input current at the primary+o21,brqej jswygn 0r14y s7v5 adh+a 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 ha(rk qp (;ts49phteng9lss49 fs 200 turns. If the gl ( hr99nqf 4p4t9 tk(spsse;input 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 turns and its secondary has 200 turns.d,8uea ;p+k/emx 3k32 u6 zutzv 5wkqy If the power input to the primary is 100 W, we can expect the uwtz/k u8de 3ezk+ky;p m, 3a 6xvq52upower 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 oumy h.eib;(y jve31t 2v(tj w0f 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 turns in the secondarybe( v3tv0 ;yuhi(mtwj.j y1 2e 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 608glsm1b381yf /nvib w A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a p 8fby/ns3igw81v 1lm bower line 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 co-8 qkww(7:hdp)fu whurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if th)8pw7:okuqw -( w fhhde 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 m 5 rada:xxl v76iw9l3a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio3vx5wmlaai d7 xlr6 :9 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 knsynmn1 r/c s00; b8uvm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage on 0m0cbv/8yusn;s1n rf 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 lest tu.k wx*;rb tme(n24s power would be lost if the power were transmib(;krtn wtu2mt 4*ex .tted 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 transmi:bdpx. +1 dwlotted on a line with re pxo+b:w.1d ldsistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much e0+lb,cq n hyv2ye)/sz- asi( bnergy is stored in the coil's magnetic fielv0b-2h+ecaz s ib ys),yq/nl (d?

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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 chds2)w .o fkl33w / izzsaq(x9ontains a 6.0-W resistor and an 18-H inductor. What is this circuit's /sxk(3o3lz di.9)wa2 wzhsfq 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 circu1 q-mg3s2ioe0az. umy cp 56mjit 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 peakd9a(n-e /lzyc 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 the resistance of the ladh0 3 z4+imqokn w0yh/mpwhonyk4z qd +ih m03/0?

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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 12)g(8 egrepbn1n (g qrd0hc*shn)+d-p0-V ac power supply. What is the peak current through tdedhqbg )+n1s*r h(pnr8 (ecn0)-ggp he 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 p+rpx1y9 rg5u sx (yc4a 120-V ac power supply. What is the power dissipated inpxcp+s1ru4yr y 5x (g9 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 akwace* 9u4i.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 xhbd3, i xtl42resistor 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 reu6sk8n;tg 6qfr v6d 8zsistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hm* m);rhu u8fuz?

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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 2xf/zi8mgf1 r.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 ao+zf 0 u7ty-lf 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of ivtv+8.1wr8srl f kmm ;nductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH induce;nh2vvqpt-nb6* 6wj tor when 120 V AC at a frequency of 20 kHz is applied to ij*bp 26q 6e vvwtnh-;nt?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hzfdn ;wkwk)4p8g443m dxnbcr r9zl 4,p 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 reactzoclfj(x1dkak. q; z m.67t 6qance 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 of capacitive reang:;cxj:n7; p 6fet u.l5fl ubctance 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 reactan.vd6owzlvp t5 ce4 n6o;)/14tzbqhdf ce 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 capacitor be 1o1vene/(f h3* q6 g7mmz8svef00 W?6 v eof1nmm 738*(h/efvseqgz

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacq.x7h9 j1yr thitor 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 series3ix)a /v1n*3vx usogv circuit with 12.0 W resistance, 15.0 W inductive reactan1uog v * s3v/an3xvix)ce, 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 c3 ychck/hn v;+(3hlq 2ip. utgoil, and 1.0-up gcy;i3cl2h k vh3+ n(hq.t/mF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mdbg6yw, 1owmw 0 bn7;)ysvsy)F capacitor are connected in serisyn sy0o;m)y ,wbgb61wd )wv7es?

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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 s r0g 2;a;;/vi kgcqdsteries with a 20-mH inductor, what is the impedqi0;2dt;sk g ra; c/gvance 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, what is ts8u)5 5ox mb tf5kax)ahe phase angle )oxma5)5xb ak 5fsut8 at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1w5kq3 4k7xh d4wl0beb.0-mF capacitor for a tobwlb7x 50wq4h e dk3k4tal 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 q mgv*u8y yf)awma //;needed in series with a 100-W resistor and 15-mH cov)//mua fgmawy8 ; y*qil to get a total 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 ezhjg4v/nt0 l i+dvk/en/j40,i xa y/put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?tl ex /g/jvnah y/d jik+0v4,n zie/40

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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 10xpm -ae n;r-5e0-kW resistor at 1.0-MHz for a total ipem rnx -e;5-ampedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the imped0vqx b8f,36)yoxzit r anxrb,tyfxq3) 608 zi voce 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(bxtous;oxkl6ep e) 3/ :.gfd series with a 10-mF capacitor at 1.0 kHz for a total iegu.tpx o) 6 d(eob fs;xl/:3kmpedance 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-); (-jl m:tuwsg , :abu;pmnqgnw7q)ymF capacitor at 1.0 kHz for a phase angle o pnn-;ju;7gbu wy:glwq:)s(, m)tqamf $40^{\circ}$?

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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 wihu(b19+ewfq- m plqw/th a 30-W resistor at 1.0 kHz for a total impedance of mw1-q+b(pleu9/f w hq 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 i hsx/3vss)u7ls the phase an3)l u7hs/sx vsgle?

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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-mH coil,b qr3. wbsi*b+kxmi 87 and 1.0-mF capacitor are connectedmk iqis3b8.* 7xrbbw+ 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 14t2;l:xqn) czdh g fw50.0-mF capacitor, and a 0.350-H inductor. The cir;z:x )ndw lf2chqt54gcuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30ou3c7r/0gyqzq*rv(piu (r v 3 W, and an inductor of inductive reactance 30 W are connected in series to a 110r /vvp cq( u037z3 q(rg*yoiru-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, aakeevj4d4: mullp 8pxx *,m. + 10-mF capacitor, and a 0.45-H inducto xmae l8l, +pkdm.j*4xp4:uv er, 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 sesk 4ath g/ b */wn-fqyxdv1r51ries with a 500-W resistor for a phase angle o gr tyb/nvq/*h-fs1 51kdwxa4f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what f1 n 0ow;wa*gkfs8tmoy g(-0ysrequency should the circuit be driven in w*ofgw moy;gyaks01s8tn0- ( 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 withm hilg4,a9 1jc 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circia1,lm jg49 chuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu )h5,mmc a6jhzit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W.c2 wu qs fat6(*mv.oym 3t2ws. What is the power facu s(6t3f*2.m mc.at ysq2wv wotor?

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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 circrf u,kuqitf; op g;l.74hlw nxa:5,c5 uit containing a 50-W resistor, a 10-mofp5wu ir,ln.;f , kqxagu4l t;c :h75F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor fsc(l2 ,z84fvlh0 ;ixb brjo4and a 15-mH coil in series?v,240 8 bi4hbxscfzll(fj ; or

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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 seriesk5ics r1wh( 4j with a 4.7-mF capacitor for a resonant frequenc4j (5khsr1wi cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freqhq87owg2 vu ,juenco28 u, gj7wvhqy 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 with a 30-W resistor and a 40-mH covs.ox; xdsp vl3v 63m)il if the resonant frequency of the circ)vov6; 3lpx .3 xsvsmduit is to be 1000 Hz?

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