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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 flunw3 - i5ys;izxgmt0z)x except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thnz il 81.1bjtyat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces d739q-r; n k:dwcrkby0x, xrvwhat kind of change on the induced;rxnwrkc k-,0b :xdqdv r9y3 7 $emf$, 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 fiefswti4 n p*/i+ld through a loop of wire produces what kind of change on the ind+w* pit4in/f suced $emf$, 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 produces what kind of change o m 0h5/eohy/lv+ ewb-on the induc +lo0h m5o/ybhvew-/eed $emf$, 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 a6t:yu4r6gje3c ;g ;bdel9r wg n $emf$ 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 curr /d3 tzne9vtd,ent in a conductor will be t3 tt/9nzd, evdhat 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 max yt h+fk:,o)vf,1l,s3sdi 6/mvdfu qgnet is held above its center with its north pole pointing down. The stationary magnet yvsidqu) fs/6tk :vf,,1+ odxmhlf,3 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 magne(dxsrfwi;ty)udxo 0p4 n0 a(3t is held above its center with its north pd a03;(sp(xx nu0)r otdi4yfwole 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 the magnetic sue5dpgqh;j9nbnatk 94l8v)0s t0cf*e;.g r field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of nnc98 kg dethjl;)s* 0f 0.a5u9 q4bg vse;rtpthe 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 lesbq g xg8+/+x6omo d**g.nhmovel table top 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 thigm 6dbh.+x n*x*ogq8/ smog+os 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 e k 2:b;*f+3cmzivkjo to9tz 5a region 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 disappeam;2c 5 z 3zo*k9tbefoitjv+k :rs?

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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 eve x;))lwd qd8ner-increasing current northward. Two coils of wire lie flat on the table, one on either side of );e dxln8)qwd 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 north pole enteviq87y8g 2pquring first. As pg88 27qqviuy the north pole enters the wire, the induced 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 angb y5 ts u8ameqms2/2*hular speed about an axis whose direction 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 rots2 bt/5 u eqsyamh8*2mation 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):gp0n 0sjg un speed about an axis whose direction can be varied. In a region where a uniform magnetic fieldunsn)p0j g0g: 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.ag8dv5;6l /h aabu9ew
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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 thj0 hp klb v1vgb/uyd2a7c-i;-rloq): at 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 magnetz58laeii 3s qlh s*29lic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west diret9sthrjw2 n z+2m.g/xction) is moved northward at constant velocity through a magnetic field that points straight down. Make a st/jrt2 m+s h.29t nxwzgatement 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 anguldu n)u7x; fb roqp kb*4+ncojph 3-0;qar 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 generato h1z2s5qi0ol / ilhltw4)jk6or transforms

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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 seco6dohqae/7/zm ;qk qh4nd. The frequency of taqk7zmed 6qqho /h/;4he $emf$ 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 dev v5 o*u,c8r9jbr3e-yifmsc gt. 1syd;ice 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 t/zg p;p4vfpo:,t wbu/,n mx6mhat

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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 rmx4 ) /e qw/idrm+ag5than the primary coil then it is aq+)mr/a5d4w egr xm/i

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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 seco ynz w1,or -ea(ugl56vndary coil tl1 anyw z56uev o(-rg,hen 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 powerytoz rc4)1sj fbjtc6-/k )ve kau760;vm i9uh 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 ciryptbu; 64boz ;3v+7iv 0ykfbrcuit,

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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)9yyrx diowuf28ga 1( an ideal battery of constant terminal voltage. At the moment cono (w2ay )81rdg9 uyfxitact 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 connecte6 6zpotax *dzi+t4 mwq6h: -lid in series to an ideal battery of constant terminal voiim6xlaz4- w6 zq p:6*h+tdo tltage. 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 resistance R is connected tzx0crsu9ac+zur 4un1 /6c d o/wlqk83o 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 connectev6 *f6*;jfupqe k*hbc d 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 arejarcg) 7/f:y0a ymr,g connected in series to a battery. The time constant for the circuit represents the time requiredfg,g: / arrcy7maj0y ) 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 inducto 7wsps -uv:mr:3gu;k br are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cursmur3-;bu 7pv:s: wkg rent 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 exc;wjyj yp) 9xfej4)7s z z7bvt0ept:

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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 sx* fg5na :x:pak0pn 63 rstwqh4j -p2lupply. 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 suag +3jja2d;w jpply. In this circuit, the currena3jja2;g w d+jt

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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 yo;mvxf:p2 k(3udc9 n an ac circuit changes by what factor when the frequency is tripleu : ;yxfdmk2o pn(3vc9d?

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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 hwia .kq;77gtvoltage across an inductor is doubled, the inductive reactance of taqi;g7k.t w7 hhat 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 vo yt:grnwxfmo/d /uw -w/l6; 8fltage across an inductor approaches zero, the inductive reactancml6rw-nfu t8 /y;g/o /w :wdxfe 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 supplyj* k+:rcst+ dom5pptsy;a+ ypc 13o9u. In this circuit, the curren1 at5+uopc smcdk+9*3; trop : psy+yjt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor whewg 9* 1d1b .py*sllzlen the frequency ilzp*se1 *.lw1l9 gb yds tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, thet- 6 :kt4lt :kszdxuj3 capacitive reactancekjukdt:l4 x3:- zs t6t 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 voltag-*piqq/cqf+7 /jmb .phnudx,ho h3 ,pes of the inductor and capacitor in a RLC series circuit? pnqdc,hq/*m hqx3, p-i/fb.u7o+ jp h

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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 asv gx 8tg245t(cct,f wd $\cos M = R/Z$, 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. 9lo68uvpdbu-.q;op lq f (uq0 The impedance of the circuit increases if R increases. When is this statement tru bu0quo(8 uqp.vdll-6;f q 9poe?

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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 impedqq:wy9ctq . -zance of the circuit 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 circuit increases if 7yffq kl:tbsz;*v a37 (;r* fz8zwcr i$X_C$ 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 4-cik6 4g e ll*4kgepjthe capacitance both double in an LRC series circuit, the resonantj4g 4 c-pi k6ge4lle*k frequency 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 driven by an AC applied voltage. Atzxke8o9is 2t. 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 q(zy-ve qi80-m g4/dtdm2v dmcircuit 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:1njpw )mw2 v ;,dr7xllh yt9t rotating in a uniform magnetic field of 0.20 T. p7wylj12 th),9txdl rnv;:wmFind the 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 in a uniform magnetic field m4( )zuv+m ueojfn8ddlo4 .f,of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pe4v jmelo.dn,m f+dfz)o u8(4urpendicular.

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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 fiegsu(p/hc4x91 z3 5tfeavfs2zld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at 54a c9tf(gzx 1fup/3hsze v 2san 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 ( *iez b-x(iwt hb;eea;eb 5s3area of an adjustable single 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 coi8m72jvn2o c khl 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 200 turl62w e*zl5kubfxrx6/ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducedl z6x56 l2w*xbu/rekf $emf$.

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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 a r-mi:s a,mj.*gqi9 owith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and t8lfzye b/3 bkk9m9/lcefg 7;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 horizontally at a location d,r mbhp5o*:o where the d:b5o , pmhrd*oownward 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 constant anhua *yy h8 z*3hjvo+s2gular velocity of 2.0 rad/s about a vertical aj hu82 hy o+aszvhy3**xis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional are)g 3asuymv 8q5ilj u zbm y52;ln-x+1nvcr/*ca 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 aredk+ l)rs8 (upta $0.090 \; m^{2}$ 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 12dg-z.r8o 5p mhu3 1dur cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generato5gd8.1ur- horz dmu3 pr?

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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 e4 qo+y luyc(*wyrtgpt)2;8le6lv 1aturns 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 t )pb)m7wu7g iwith an output of 12 V maximum when rotated at 60 m7t)g)7pwbiu 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 generatts h ui *djiif6)5z0b*or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanceawtgc1 *iw.m5 of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have ad/ewiz4q 9se2 *8jcm -pjb-pr resistance of 6.00 W. The motor operates on 120 V AC, and when runqb-miz/-s4rwc9*p e2jd8 jepning 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 intern3v uv5u 08jkwprcp6o -al resistance 6.0 W is connected to a 24-V power supply. The operating pp58 rvv3u6owku cj-0 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 power su h5pm2v.xfi+st)s2 d upply. The operating curreuvsh m52.df t+)xs2ip nt 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 internado v4(3ljrr1q l resistance 6.0 W is connected to a 24-V power supply. The qd j4ol3(1v rroperating 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 a primary voltf q9rjfhfy2 r00lt rra 4i43(uage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secondff6b br6f9(c6x dw8be bf dfe 6f(66bw9 bcxr8ary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns ak* v ew-9qhqx,ai0 :lgaoc (g)re necessary in a 110-V primary if the 24-V secondaryl0ca9(kvxq)g- aq,ogwe:h* i 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 500-turn primary coil and a 2000-turn secondary +nth,3 gqihnf*74io c coil. If the current in the secondary is 3.0 A, what is o fit qg3+*hnn7i4,chthe 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 flows0qhbn/p6 vhf8 in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the6bnp f80h /qhv 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 750l1 -br -,gwca,l x*oeg0 V at 10.0 mA. The primary coil operates on 120 V. What does the,acgr g - -1,xlo*wble primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns o9h.rb6hi7 dqk8iqu 4xckrfhmgq)l( dp,9 14m n its secondary coil. If 120 V at 2.0 A is applied to the primrihh644, rlq)f1bu g 8.d kk im7qdq9h(pxc9mary, 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 on its s pcwmvo;w h2e8k2jw d3 *(op5jecondary co2j35je;pdk( 2 vp cm8h www*ooil. If 120 V 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 transfojows)ko,i; c iczg ( 5i6cqu9*rmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we cgkwi, o 95 cuq)sc;i6c(jz*ioan 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 hi.mn9*p:oa)+zh - gyyn5 rzdmas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondz5ry)* .:hmopzm+n 9- yi ndgaary 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 3ke*/d 78rmabh dkxo.has 200 turns. If the power input to the primary is 100 W, we can expect the b*dkr 78a. ehxm/3kdopower 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 -iep1b+*8lrd bhl g/ bV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance1 br bp+hle8 diblg-*/ 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 svrk ; xfkoym3 t23p*hd;y- oq9tepped up to 4500 V by a transformer and transmitted through a power line of total reqo *k d;y9h-xok3rf23tv p;my sistance 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 usualro;.h+ye ke5h ly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power5+h. ykoehe;r 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 transmissionwx;u vky + l2 526jfiacs o9,,qowua.n line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. Innx;2qv2 j+ iau95a,sw6.ufo clywk, o 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 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 ha d90dv wwsq)x4s 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 of the original energy is lost when the transform9sx4)d0qd vww er 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 mnusp.n qmp1xl8m;)z: c 9kw: trh0b1puch less power would be lost if the power were transmitted at 3000 V8sm)1nmwphnxk1bur 0pztp 9l:c . q:; 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 transmit 6 :782tiwjuk7vfid 8gfb mtug81afb4ted on a line with resistance of 0.60 W. To what8aggdtjif 48u7mtk26bvi8u w:7fbf1 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 energy is storepp-pyj4g 5 e6md in the coil's m ygp-jm p5e4p6agnetic 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 14l i28jo0 wukd(p m 0mn;uth2z8-H inductor. What is this cim8douuz(0npw 2t hl 2 ikmj;04rcuit'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 mkfts6h :z3i*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 current1.sn3 em mq*yw:q ticso*8a8c?

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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 irzpckdb5;in/7e,4v ;/mb io9dqm k2is the resistance of the lamp?mpd k bkzi /r/ebo i;v7n;d4icmq925,

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What ie fmj-api4qwmuhj+*7 x) sr24s the peak current through the resistox fs4 -2 quer7mh+p4*j)jmwi ar?

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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 1+x6l8lkx.u y/om qsq 720-V ac power supply. What is the power dissipatex.qul6qyxk/ smol 8+ 7d 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 resistor+;1.p,/ogigedspv9 jph8uuk;dn 1 a u 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 rem4f1x-i ga j;o *hl,py44nbhasistor 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.uc9fxs: 7dx3bg *tvq 50-W resistor 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 inducto g 0i5 y;y66x9c/;tyymbcxip rr 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 coi97puq l69. wkt5yk23 t/wp fivuft*kbl 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 ):hs1ny s qkk914.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance atbec p 1tanxs :87k-i2i 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 yx*+77zeejc l6pmg7wkHz is applied7cgmwe j7 z+6 *eylx7p to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due toii aw,dd4 lhx rd.,j:u*)b49blpfpx7 (to8 li 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 r)v p/s2uwktu 6eactance 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 reacta1cpx(,uq51pl gx4xaance 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 um,()hjgrpx1w: umy7c/:ij +bcbs6 v 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive rean5s8e pr)rvi qml umf)ov0 na6/5tw+2 ctance of a 0.010-mF capacitor be 100 W/qwo 26msvl+rifp0tm v585 ru)n)na e?

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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 0.0010mgp i7o oc1f-hgw/ ;s*-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, bgjg x9stu.ejy d5sei ; (.,n415.0 W inductive reactance, adx (s;j,e5u..ggni e9ty4b jsnd 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 coil, and*9is/k kc* dwa 1.0-mF capaa*cswk/kd i9*citor 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 res 4: 3d36ok sls s-cwcxyf2j1byistor, 20-mH coil, and 1.0-mF capacitor ar41skc :3wjyds ocs62xly-f b3 e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in y5finlqo 2pq (wwp9+l m5o(5aseries with a 20-mH inductor, what is the impp(+qlpio5lfw m yw5a( 52 9noqedance 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, whatkxl80ji ubdyj)7 lk.2 ocm:(c is the phase angle at 1000 Hz?8.u) kboicmcj (7l 2:dx j0lyk

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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 wit gvsfg,t .l :cm6cz.y-ur q8*hh a 20-mH coil and 1.0-mF capacitor for a 6qc.frh*ty ,-c.uz: lvggms 8total 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 with a 100-Wx bm57- v 3gjtuwpd:zh3*t b jj*kek1* resistor and 15-mH coil to get a total impedan37*ett* k 3gb5p* xuhb:mj j1dvjwkz-ce 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 450-mH inductor at 5000 Hz.i1+h;iuk kl j/ayo9 w for a total impe. a+;i y/ hluiok9kj1wdance 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 serief;ypi658qdo qx/-d4f cwzu/a s with a 100-kW resistor at 1.0-MHz for a tot 8c z pfwy 45/odiu-a/f6qqx;dal impedance 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 ser(w5b mx 3kqrrk.voub/4hk14m ies with a 20-mF capacitor. What is the impedance at 1000 Hzmx4vkmbq.(w/ro5 khbku 1 4r 3?

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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 u3 y mmi/esxm7emj) . og6pml8(*wco.1.0 kHz for a totall.6exg om m( 3sji/u7meywp8*)o cm.m 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 capacitor at 1.0 kHkh,iuom ur53 lern:7g sir;,) z for a phase anglm,r ;eso)ulu7hr:3r5,k nii g e 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 resisto1v( w+r0 2 dssv u6xsgyp)e3ytr at 1.0 kHz for a total impedancy xp(vsgvu + ty0ewr62ds3)s1 e 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 1g0kubl)nfl ,.n+r, p ;wqync.20 Hz. What is the phase lg.rc0 )fn,,y+ k.u;b npqlwnangle?

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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,syyslj*/v; -wbv1(i d and 1.0-mF capacitor areyy 1ss-*;bv/ij( dvlw connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF caphdofz2 pe+ j1o h)(yo8acitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the c+ ph1 yzoj2h)ode8 (foircuit?

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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 capaciti6qzwdf b ,/j4rijf k78qr:mx3 .q(qf zve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a bf3ijf rq r.zj8qz6 7dq m4w(qf,k/ x:110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC ci x.:g0hnm r9ijrcuit containing a 50-W resistor, a 10-mF capacgr0n xi.jm: h9itor, 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 necefdx+mvyco.)* ,x +a sessary in series with a 500-W resistor for a phase angle of +)*x em+f ,xosvy.da c$40^{\circ}$ 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-mqye)w p c9h. 9kksr58aH, C = 10.0 mF. At what frequency should the circuit be driven in order to havh8 99)p.ey ak rk5cwqse 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 resistonj4o.f:h20wl+f go7uq di : j 8ncki,ance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suppfk+on.0ic4 :g liq7j2 w:d njfo 8uh,oly?

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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 Agcha4 zt vd-ga)p: t;5vaszp+l6 u4.cC circuit 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 impeda .bp9gd(ssq6 nz( gq;4w2ae mqnce of 60 W and a resistance of 30 W. What is (d( qm9q ea6;s2pn ws.ggqbz4the power 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 se ud0i* kqw.jn,ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indudnui, jwk.q *0ctor, 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 cx )x.vei269e 2lgfstkapacitor and a 15-mH coil in series?l96g. te2x)vi f2esxk

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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-m j)f-qvxj-0 g jr8n5v w-jvz7vF capacitor for a resonant frequency of 10 kHz?0rv8 5nwjjvqv - gzv-fj-j)x7

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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-m9y t-)a9lkqq:ibth9 d e:2+lyal-ehcH inductor for a resonant frequenqt) -a iya9 qc+ tle:el9h2lyd9bkh-:cy 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 s3nmtlysax ;gqi-w ouhw34ho6k o60*fla3: :a 40-mH coil if the resonant frequency of the circuit is to be 100w:;6s nlof6 hya t*0qg ku:-m oail 3o3s34wxh0 Hz?

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