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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 magneti:xbqxu1xx mwfb1o;v-s-7y:)vu 1 gq zc flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tha.qj/ 9.uoxcnytu7 j +bt 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 e+ /pjf/c p r3or)+zzvwhat kind of change on the iz/eov + pc3+z)f/rrjpnduced $emf$, 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 l bwvsnudn/7kl:c.l3s5aps4sfv8v r. a f48f+oop of wire produces what kind of change on tsscvkn+ / s4l 74frf58a. saupd w:nv3vf.bl 8he 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 produces what kind x,j2 jdw4b* v9 k etr+ s2jhok1/s1gjuof change on the inducedubj +9 eo2 t24w1kxj1rd,ssj j*v h/gk $emf$, 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 ma2- myt/wqjyw 8k mh8d5gnetic 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 dire g7de1,maxy v5 ru0hu(ction of an induced current in a conductor will be that which tends to produce w5mg7deahr1uv u 0 ,y(xhich 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 magnemk /a7 7xzi; d1vek s:6wtok.lt is held above its center with its north pole pointing down. wke/ x17ias7 l6;k vm .t:dozk 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)9ra ;: nz59sgnnbv je horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approasz9n:r na;9 bn) 5vejgches 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 a6jmt0yuns ;-f8n yec94(mh2 v:c jehsxp jp36 region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the s: uh0(enxjth 4-n 3j2fcssm;y9 jmvy6p8c 6epense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level ta; 0+uk,gtgai kble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from a, gikkt;+gau0 bove, 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 to65/bou ix2/ofm:kk d qp in a region where the magnetic field points straight down. The magnetic field di/oobi5fuk2 k /6x qd:msappears suddenly. When viewed 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-increas53 pgb,- yugvping current northward. Two coils of wire lie flat on the table, one op- u5pyb3 gvg,n 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 1:beka q8bod*the north pole entering first. As the north pole enters the wire, the induced currenb81o kd*bq:a et 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 consta:;43 *q0isc juz ogysiqb5 u.snt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be th *q.ys; sio sujqgic3 u04:zb5e orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speee jxf/zy.jy57,e,ld bd about an axis whose direction can be varied. In a region where a uni5fly 7yz,.je bdx ,ej/form 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.,3.pzgx5l6ijir4 usw 5 zj0s :zr)bh k
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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 aujf r(r0g94-mr e ey/tn $emf$ 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 ft : h6o)(j nnjmyrrd +jomd+99ield. 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 (orienlqttpi*ec-1- r rdjzo -gp)6/az: e+vted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across th/*pr)tt do16g jra lep:+vzi--z q-ce e 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 velocity s.oj2- :dis+d,q )w frwq3mis+mc(oq$\omega$ 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 transform19tjct fc -yv);dw-z zs

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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 fre 3oq(h iefz)4qquency of the4oehfq()i q 3z $emf$ 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 us lzujw-(q9g; ced 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 hpan qjt3n0osta .hw+ a q,)-5rxy)3gthat

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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 mbtur8bp.65;s dsd( t the primary coil the5p(; 8u6dd s.bmrsbttn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the 2cxa(41 jtlj4 7yaspk;s p 8sysecondary coil then it is y2j4sj;4lap as1 (c 8pytxk7sa

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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 iqhf jy pw(.*)pufm,6 pnput

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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 resonantyl j6i,:jjuh ) circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battm ,5ul cg;smue20j -bcery of constant terminal voltage. At the moment coc5jegs 2mm uub-c0, l;ntact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battd*dr4 d)o 4ll.g j5e88evjt ilery of constant termin8 loj dretlj lv8e.4d45g d)*ial voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit wit5j9i zg7lr- gbh inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 an+ez )r(iz0-( 8lyisqlt 9kkk md resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b:3 yrspj/gn jpinz+dp2ao(:2attery. The time constant for the circuitpp:ngo: nza(+ jd3 j /yr2sip2 represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. gw vhsod7(;/)vjhl s(The battery is suddenly removed from the circuit. The time constant for of theosv)vgsh ;/d(7h( jwl 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 theh;)62dj r8cj2h uxfxgl;3 x gc same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. Ow-*w 4lihte 7pji()j un 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 curzeuf*e x -w4f5rene* w-fe 4xufz5t

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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 1lrja:1 0o o 6gnu+gpocircuit changes by what factor when the frequency+p1 n6rg0: oolgauj 1o is 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 anp4z*m-cym )5syn6tb h inductor is doubled, the inductive reactance of that induc-zn *5py)y4t msh6 bcmtor

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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 ,/rf-wpra8h 72r 0hzs jwwzf(across an inductor approaches zero, the inductive reactance of that co8(rh a r2ws0z/hfwp w- zrf,j7il

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thrd 1ppa 1h/zfegc .3b:e curre b1he: c pza/.3frgpd1nt

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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 wh* /)pxxmn ao4,c j3lcp0 vfn-2mx;ji hat factor when the frequenc/hxn4nl;i2 j c0 pj*av ,mmx3fco -)xpy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of th+6i 0q*/. dxpx5bps xtqan5dte AC voltage across a capacitor approaches zero, the capacitive reactance of pti q xxd6ba5 .snx+/dp 05*qtthat 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 betwfs68 ;h72i,tstgm q nceen the voltages of the inductor and capacitor in a RLC series ht;g smc8st2 6q7in,fcircuit?

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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 q2l+ 6 wp+(wv,phww1( ariauw 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 incrnzsit vo15c35a m;o+reases. When is this nta;ocv15si5rzm o3 + 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 os)d+k92r7 hhr5eo d kif 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 2q 5xm3k4tx f60zzqxn 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 0 t..tymg6eulLRC series circuit, the resonant frequency of that circuit wi6 t.glytmeu0 .ll

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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. At reso tgwe5k- xxcvj jx;2g9z vcc*.7c e8)anance,

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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 occurs when 4 si6be4y+r5bpu rq1u

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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 rad8g 2svh9z53 hj f)n;vlznnl3uius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 8 3gzn5s9;zvvnn f3jl h2uhl)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 j74fch6mwx-u uniform magnetic field of 0.20 T. Find the magnetic fl xwu7 m6-4cjhfux through the loop 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 is rotating in a uniform magnetic field oaw1 p sv;, p3ya+)mzrvf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiel z1 v+parsmp),v; a3wyd 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 )l,s:q s*x(bmvqf0kbze ek28adjustable 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 coil chpf; pa(3ykofgt-sy3 ljo7 p+ 4anges 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 turn vti 9p/fepq1.s of wire on a square frame with sides 18 cm. A uniform mag.qv tef/9ip1 pnetic 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 15 turns and an ,v5au/wd7 cm+c hqxegm9uqe wgt)60wg 8/o r1area 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 area 3i9 jhzu5apk2gx07mu $0.20 \; m^{2}$ 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 a2h0h 8bsrqr/cbdvz (rw0zz+; t a location where the downward compone8hw cs z0b/b r20+rvzzh rq(d;nt 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 angulafl 2;9 q72uvwbpjua)or velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constanu)a2 u7w;bl vpo9j2q ft 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 odz8sj.u x+5 yt- na/pqf $0.25 \; m^{2}$. 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 consistsop; j.6ei2wwy of 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. Each loou)eoh7zr+u o ij- y6z)p is 12 cm long and 8 cm wid) ijz yh)e-u roo+u76ze. 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 ar87l.-zzz c :m my3enymr 5e+krea $0.090 \; m^{2}$ 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 -uf ..f 7xrddv) 7yqus12 V maq)fdrs 7udux.fy7v -.ximum 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 with a maximumr mcyk0( c4gzc4vv/y- $emf$ 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 resistanc 1fw/la 9lr9hnls7j*be 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 a resistance of 6.00 W. dxoj jc;6b, +sa*xvv;58eru pThe motor operates on 120 V AC, and when running at full spe+exsxap8d65;* v;o uv jbr,jc ed 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 Wfy 7kjq0tqi23 is connected to a 24-V power supply. The operating current t37q fkqy0i2 jis 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,on e po oz61ivih2;4c))efgz power supply. The operating ioozive 4pn;2)6g ,e zcfh )1ocurrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resf1ync;c smvjrhn85 :2istance 6.0 W is connected to a 24-V power supply. The operans :ry;j8v 2c5mfchn1ting 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 vo*zud p hj hpse)-c2ntw :b)8r3pruk;(ltage 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 o2bfvhcm ;j.:x1yg*6 j7tor,ely :g igf a transformer causes 14 A to flow in the secondary. How many turns are in theg t72 c *of6gy:xbjvlim.1,: e ;ghjry 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 necesgz;98lp/yd 6c -hgk issary in a 110-V primary if the 24-V seconda9d- 8 kggz/icly6 shp;ry 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 5hqd,-nq 5)iqf1wl + nhp 4l-hv00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currvlnh) +nqpq 4 q,w5hdfi--lh1ent 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. Assumin v3xe/ px+fcuo3qz90yg 100% efficiency, how many ampz3c 039ux e+ qvxyfp/os 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 providesl,x9/je8 fui r6:hnad7ni aq , 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the 9eq6rji/i 7nh 8,ulxdnaa, : fprimary 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 vynk5 1,lpz:w has 60 turns on its primary coil and 300 turns on its secondarwl pvz1n5 yk:,y 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 k5o vgn2 6ln76pj nxr960 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curr27vnr 6xp lno96nk5gjent 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 anf/njki ysqdb/x+ 7rpu p 6,.3bd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curnd7/ sf+up3p r/qk xj6i,.bbyrent 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 transfo.wt ln /,t)hlcrmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output tll)n, .w/cthvoltage 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 secondwgh:f*uu.n 8bf 6iua+ ary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lgin 6fubw hu8.u: +f*aosses)

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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)c+ok q (- jzvvqfj4.5rmc0db usually stepped up to 4500 V by a transformer and transmitted through a power lineroz)+j dq0v kcm (f5.4- qbjvc 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 60 A of currenr w6xwqubbb*3 nv my7z/ pdc9b3r:d ,3t 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 tranb3rb/3, mpcq6nrwuvyx3w7 bd d9b *z:smission 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 fhdf4ap48oyd mb* jy g71 v94rat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisj14a f4g79ofdr bvmd4pyy8 h*tance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanci j/a t81du*od6y3qnr e 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 percenta qdda63 ty1juoin8r/*ge 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 linehmr. jva -/q.y 50 km 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 percentagvaqj-h my. ./re 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 less power wo d.q ol1*i.si t2igbn7imdh09uld be lost if the power were transmitted at 3000 V instea*.g d0hdis 2m7n iiq.b9t 1olid 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/ef ( x+rqen,y line with resistance 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 0.0n e,+/f(qexry 10% 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 energ10cyok.bvae53 ibp 8o t d+8ipy is stored in the coil's mapt k15e i+88v .dbobp03c oaiygnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H +dkj /x/:s1;ed qdzq minductor. What is this circuit's time :k;mqe x/zs/d 1+ qdjdconstant?

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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 voltag( i l8y5eiu4v2csm+x t nnzo;6e 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 currentbwm .vd0r;zt8?

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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 thw mb,r;z:x(oby0fg o( e(b iy8e resistance of the lamp0b:;y bio( (bey8f,(wxgr mo z?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cqgl vc + 15bkov7;(vpdz(fd;murrent fq 1(d5v bg c;;7+(lvdmzpovkthrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supp24 g+wr b/uuty0rqum6ly. What is the power dissipat4ryu t/gu26qu 0mr wb+ed 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 ir+z5n bys,ay4s $I = 0.80 \sin (240 t)$. 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 resisto(snweyv(fs 7b22 ax(fr 7 chq2r 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 resistorgh:9 7k,zh o1gzeq*mt 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 83 +1bt: nibg wodu0ip 9kh8axat 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 co3: pp8dqur/ryil 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-mnei h.e/ w,bj 2n(h5zy0n)ex 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 15ry4yi jo1+w 7c7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120naa842vhjw p:ivrr+ po.01l q V AC at a frequency of 20 kHz is a8vpn al p1 vr2+rq.4:0hjowi applied 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 v3fo )tl ,gv4jto 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 react7oao 2q7f y+3to-g laeance 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.gfe/:4x0: twqbh8mdu up 9nc needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitoaaj()ss.q 1u zys c:6or 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 37x lxnevvv(0my)3bpcp co+( capacitive reactance of a 0.010-mF capacitor be 100 Wc(c+0 v (x3vlnv xy37e bp)omp?

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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 capacitor at 10yfpu k m3 *19nphw7rv*00 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 Wkbf7*u x5cytv(gwi-q 9u- 0sy resistance, 15.0 W inductive reactancek0*5 u -u yvt(wc-qx gb9fiys7, 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 gq 8aqe+h(: gz1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arehqg+a g(q:z8e 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 hcs7pyd,6d qq8 a:t 2 3c.lqy 0so)rio100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected)0,86qpoyqiqdd s l3 r: ycat7.hsoc2 in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is mp 8ge-u4tdp-ht3 + 4l.fd45rl- s6 l blkudknthe impeda4t54r-m-sbnfk + 4k .8t leuduhldp gdpl3l-6nce 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 connec9 -oardky b8n19fka5q ted in series with a 20-mH inductor, what is the ph9rak-y fnbd 91ka8 q5oase angle 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 1.g1 jd(j2o b dzmh+ch5 kdon(u6c3u26 r0-mF capacitor for a oc d(21+jjho2u 3bmd d zn66cguh(k 5rtotal 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 +sjka w3 e-g*wneeded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W ajk -+*3s ewgawt 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 (bwkupu) 8t.i with a 450-mH inductor at 5000 Hz for a total impedan8bi p( wuu)tk.ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wi28/mpnvg uc/d 3 qztr+th a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?m p/duq r8v3/z+tcgn2

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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 impjraai:wfw+d x) () j*gedance at 100 j*fj :aadg)ri w)+(xw0 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 capacito-oal/ vwm4 *ior at 1.0 kHz for a total impedancv 4imw/-ola*oe 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.zxjy75rbvigo)b 65d ,0 kHz for a phase ang6dxirob 5jb,vz)g5y 7le 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 resistnfj1o c4+2o9m upc9rtor at 1.0 kHz for a total imped2j4po9orm+ n ctuf c19ance 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 capacit* c1jdxa k0n7c+r,7tr- o4mz.whwkk kor at 120 Hz. What is the phase h0dkk 7w1r7w,-kjoxnr4m .z * cac+ktangle?

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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 reazq a57y)m r4osistor, 20-mH coil, and 1.0-mF capaci7mrya 4q aoz)5tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuita)tga 0dee486rvwd-01pxll m consists 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 in the circuit?1lvp8gw4mx deat 0a ed06l-r)

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductrkn- pqq7m ).a,9pq ozor of inductive reactaqqp.7 kp-ao q,n)r 9zmnce 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 angle fw.th5t +5xchj or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ihjxt.ct5+w 5h nductor, 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 an kub5wo88 c(apx6l 9zngle of kpnuz56 c l89b8xa(ow$40^{\circ}$ 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 = 2002z+;pbr x )r-nfts0sh -j 2ecn-mH, C = 10.0 mF. At what frequency should the circuit be driven 2tx-necr f npz shs-+j)rb20;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 ,kj)lvahdtt p -)pp6+W inductive reactance, and 10.0 W capacitive reactance, when the circuit is c6l -+p,pta) dvhj) pktonnected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit ddmi+xe 1z ixn 62q9h)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 em2ou.gas56v sq(r 4x:y6a ft of 60 W and a resistance of 30 W. What is th4.f6:s x m 5aos(ug6teyqar2 ve 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 series RLC circuit containing a 50-W resistor, a dvx+k5 )l zf)d10-mF capacitod vz)fk)d+l5 xr, 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 fcms 34xy6c;h2q tix7+j79(tctfjs yu requency of a 1.0-mF capacitor and a 15-mH coil in series?9+u cxi7hstt3fjm(6yx7 tyjc ;cs24q

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacit sdf,t h9j*rz9d( u)hw6tffb 9or for a resonant frequ (hu9,tff b s6fdt)*d9hjwr 9zency 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 resonankfs*jost c*6a xv wc *i/4yp34t frequency of 1000 */3 v j6af*tkwixo 4y*cspsc4 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 resistol+pfq8sjk c ibx1*:0k r and a 40-mH coil if the resonant fre0 p1lx*iqk:+skb fc8jquency of the circuit is to be 1000 Hz?

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