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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 ay cy b)ugs1z-0re units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states :cze(5v) jt3mk zxil 1that 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 loopah3yeqy4n )wtvv z3kf;; 18dbs of wire in a coil produces what kind of change on the induce advh bt 4w1;eyq383;fnk)zvyd $emf$, 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 thrz :izn 6jghl 6u*y/hy, q(aa;eough a loop of wire produces what kind of change on the ind/ hz*(qeul,ny;a:y jgzaih66 uced $emf$, 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 femo br1.7 mvfuf9m;7change on the induce71;oe7 fmrmum9v. b ffd $emf$, 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 fd-x d7s ni;p*lield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an)fwlrgk:s8 e u l-m35ma5c7yn induced current in a conductor will be m )ku eg-f :r5lycn5am7l3w8sthat 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 aud talxiv33h2*;v m8 o.hqt*w horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewamtld*ov 2i*h.3w 8 x3vht;uqed 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 hor zs)oyhbe-- *mizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whs )heo-*y-mzben 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 4i3 brm) g.yyuthe magnetic field vector points straug.4ibyry) m 3ight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fi1v 95f r50uvf jx,q ct,cnv:mkeld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current 9k1vvq:frc,m tu0fnv5 ,xc5 j 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 regir9gqjosx )ph+9),e s qon 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 rpqe +s ,g)q)h9x s9jocoil 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 i9s*2rjpiyk4 1e)uq a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on theqi)u1 pi4*sa29e jyrk table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fir;s(;zlzs jy(h-(x/qzdj, g 3 ssgu*vwst. As the north uw-l ;qz shv(jggdxj s*;(,zz3/(ssy 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 wireo00.l ;u/m*z;pifd oi dy)s vx/o oql; is rotated at constant angular 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 ox0s; *ofiqlzu0od;) li /vp. od;/omyf 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 con h ex4pqr9vs.,stant angular speed about an axis whose directionrsex,v.q49p h 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.8ww 6 qmh-jrjbao 4+d5
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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 5t-78mrx:* roi(a dxr jtte j0+2b oaathat 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 magay9s 4c9 6fowq.wl4k wnetic 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 did3vqj .+0z nnhf.0 qvprection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential in q+q3 0pfh ..nzd0jnvvduced 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 conl r 6x58ec8tqi7t) ry -n)k5d+nrj xmustant 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 transform)/wa(j1a6is r-a4 vv,ojvfb d s

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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 revolah953xi,/ka dpsl fbjv,u yg46-i9)0lk fez iutions each second. The frequency of the xa5yf ph,uk vlg )k9/bzild340,fsi9j6 aie- $emf$ 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 n kqm5+-dl-j vused 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 thatj,8tkp 9l0ri5tm pvp6

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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 mo flg h vzokb)-e 7.pmyr)dyiz-yz1ug p2k587*re loops than the primary coil ly12-7.zrpzg- f mp7 8 o*dkz)yhbeiuv g5 yk)then 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 sez 6uoz6d) nf9rcondary coil thez6)9 6f ronuzdn 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 - xsc.0spr8ux power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonans*pe23qxv1+ olszg, ovb a1)t ,hly3x t 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 toaf d95j 29mlhg an ideal battery of constant terj29lhmd af 5g9minal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are uw mt1d*f9vs/connected in series to an ideal battery of constant wutd f m*/vs19terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancev )p3o,umm-fpld+ fozs +46de 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 ibec 0 m l)t*cp*sg)at-s 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 battery. The time co o,3usxl3k:sqr9a 8e/1 nxhb23eo be vnstant for the circuit reposnbxqlob r/k es32 9u:8 evh3, xe1a3resents 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 u+ej +a* /1esxuef7 ohin series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repr+ ua/* e1 jeexof7uh+sesents 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 exce)y, 5v 5toxwnlx5v-xfpt:

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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 cir ow(pno-+k *qzcuit, 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 pouhkt f6 )b-quek :*tr-wer supply. In this circuit, the currenuk h-:q )ur* t-fe6btkt

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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 yz, p75xq.ps mwhen the frequensz5 ,myxq.p7p cy 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 an inductor is doux9 (l hfhp1;;ohz3 wbgbled, the inductive reactance of that ind;h(3;1lpgf bhz wohx9uctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an d0(ulmh0*+u:sijhlw2 a3xy7pl acvy0o m )q -inductor approaches zero, the inductive reacta-7asl0pqlohc+:jdyx 2)lw h0u 0avum im*(y3nce 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 supj ,z icq,2yu9g:i 8nedply. In this circuit, the currentj9:ui n8 zi g2,de,qcy

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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 chanwtf vyn m 6.c8if5s69n9sb,zpn 2hro7ges by what factor when the frequency n fwt98n2 9.7 nz rfv6m,os56bciph ysis 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,vx ,37bsuew 6c.wqw cni3/7h 5tnkdh9 the capacitive reactan/vwn5.hbqc73hew9 c63w t,i kd us x7nce 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 an.8f ask55xohwgle between the voltages of the inductor and capacitor in a RLC series circuxkws.aho55f 8it?

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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 circuigikqy, h:b,.ndh+ xy.t is 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 imp)uu 9 4llnvmw+edance of the circuit increases if R increases. Whewvlum lu9+4)nn is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuw+. yar6 ovrqz3s4 7ygit. The impedance 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 imes06wz,l7z yc s4(hhspedance 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 in8jt5x(fh)19 pxb+ de g;pby92hzw qqu an LRC series circuit, the resonant frequ5 98x2 bgyxtfpq d h+up)z;w91qbj h(eency 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 b/ go: 1l1rbhfry an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC c9( 3oyfzdrmz/0t4o liircuit 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 radiusqunb,09ban;rh r: dc fohc04* 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thc9d:0 h o,4u*hfabnqrnc0b; re 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 ro q),fk43.b-i+ jcmp tbou3udne - as,otating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughk)ocqd i +u33bj4p, sb.--tf, aomnue 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-w g0 g9izgk.o in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle o -.gikw0gzo9 gf $30^{\circ}$.

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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 amgb f/*bv1 :axpn*7 jzn 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 coil changes .9qac 5pfsr c4from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squa zz9 f;fifs8u7us -gm7re frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.59um;-zf7f8s z7 fsgiu0 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 wiub;8mcz c2 +j gvare;2:p7 bdnth 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 an4nnq mld 8i )ll8iqr1/d 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 e5 3kwtm,6d bz 7 dwgc,52grmn60 m flies horizontally at a location where the downward component of the Earth's magnemd6w5c7dg3 wb 2zt5k,mn g,r etic 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(a:ab d- 8fztv6 h4uof is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s abouad h-(:zb futaf486 ovt a vertical axis 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 cruyfm kyo4(+ ,ross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of nxcvfi5xe2x q2* 2do7 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 loop is 12 cm lo3e kxqatawm rrb2)s+i u. ;p8;ng 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 perpendicula qa+m2usw rrib.;kpex t8;)3 ar 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 ofj .. fhg p5 lt3ea1l4zyv:a1st 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 construcqu wg4go* zw-pad 0o,0t a simple AC generator with an output of 12 V maximum whe z,d wooag-40upq*g0wn 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 maximumid 3rzw6 im6hax8*jv2x idy 9sl.a7 c, $emf$ 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 havq.ewo0 nv6c ;ae 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 motor have a resistanc .meujhw7dw(j(c3 8hle of 6.00 W. The motor operates on 120 V AC, and7 wwdh hml3j(8 (ceu.j when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internab6quazs (xf c hbi,;rfpc:(7-l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A.fa;chf6cq r7(p,si(b zuxb- : 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 6sv/d;oy /60mg yo8e j y0g1p4vswwyq 0.0 W is connected to a 24-V power supply. The/s pys6g0 qv;mgy180y0yo v4d/ewjw o operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connect;llycj)w d;d ux9m6n iwux)6 (ed to a 24-V power supply. The operating current is 1.0 A at full speed. What is thlx); cux 6 i9mwwd)l6jdny ;(ue 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 vol qzr6 /pyrtbm*x y.xhzl1m ;ll05/5rbtage 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 6a jz.rjg;b0qto flow in the secondary. How many turns are in t;g0jazrq.b 6jhe secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if z6)nzt 2xsg.p the 24-V secondary has 100 tur6s)t. xzn2 pgzns?

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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 -vrii /jibyk.l1 /h:gcoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is t1k-ybihir : /jv i/g.lhe 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 transr fzx+j co8(:fformer. Assuming 100% efficiency, how rcj +ff:zxo(8many 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 transforl , wl7tg icv4kd v9e(s2-jve6mer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. 7jdgve2el6i9 svkw4v, t -c( lWhat 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 60 turn139bxydqxhtu+ -cl.d bls 7;js on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thx;l7hd l9.bqy-xt13s+ubd cje primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary;;uha xpnk a,pte4fciye r6m:ge2 a8+3*muk5 coil and 300 turns on its secondary coil. If 120 V at 2 ;taagn5cue k kuime826per: x3h;a+ m,f p*y4.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hasfsz-1 ce1lxbc*8wzzjz i6pg. uwodz.+7 y3 5u 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, b zi z- zlc6ufzd3u.w*71. +wjsg o5pxz18cyewe 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 anp9 wf) +xlsdq6d its secondary has 200 turns. If the input voltagelswq6d+9x p)f 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 azv o+y)ersg7izt7(z(m1 1) joi lci,snd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of tmo z+j s,z7ev7 i iir)(zs1 ytgc1o(l)he 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 1tcf4dpkj/+y k/9if -v 20 V. The voltage is usually stepped up to 4500 V by a tra vi/-cf 4k/pdf9t+yjknsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uv,o7wz2ggh b15j 5umxsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentj, zm7h2ogwu515 b gvxage 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 c3n ;ear2 10z3uvef8; q 7xb mrcaz+muV. The voltage is usually stepped up to 4500 V by a transformer and transmitta;xu3cef zn mucmaer17 30+zr ;q 2vb8ed through a power line of total resistance 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 resistance of 0.60 W. A geri s1z*6cboe ,nerator 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 would be lost if th1es r z*oci,6be transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generap*ji43ej)de 4w ku) rntor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmp uwr*e) i3jne) kj44dission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a zu0e4ck8wu+t . df.be6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 tw4+f ked 8zu.ceu0 .bV?

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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. Itz)ak7d4hjhi/p ,s :5e+my dja is to be transmitted on a line with resistance of 0.60 W. To what voehy7zj4 )a,dh/dpsjmk:+ia 5 ltage 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 mud8r :m3hm6c 027smh 3uzhluhg1pew9 f ch energy is stored in the coil's magnetic fielh90dr7flumhw3em3h gh21 6 s 8cz: upmd?

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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 inductor. What is tc3c)gh( s+c)x v n16tm xf5fw(fjdys3his circuit's time com6xsgnv)5tw f)s(x (3 c yjf3h1fc+cd nstant?

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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 ochr +(ce6xndz *.1a5woaho+ AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?i (fcmhe: b5 y .ar7giyp0b3o*

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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 resist70vneq,vf* zcknho9 + ance of the lamq e,nkfz*co 79vhvn+0 p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak s0fcf2i6) msicurrent through the resistor sc)0ifm2f6 is?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. i :e0gnrxy0; (cuxxf5 3n (ssev1.eov What is the power dissipated in the re 0vo xrgfe0:(1yne sx 5v;u cxi.(ns3esistor?

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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 resis1e3+8) yi rlbahg vg.stor 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 (njde/ob1xmx2cjp06i56 nfv 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res j 8zib8qk3b-+t8 wohn.yd;rwistor 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 5qj(4xlzjk3z a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil .l7m ,/t20s hdapbhvuat 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-mH coil have 14.0 W of inductiv;cy;t9 bfd p917 /9exuwhasamk 5 la0xe 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 reactan)fw9r0l0deq au0v tc 4ce 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 itwjj13 j-,v fj-yekv +n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is appliejf-+-1yvjkjtvj , ew3d 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 j:/a, cyqll2ydtoq(6 to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7n+r + *bxhsw ri664oun-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 reactancv8.5d162 hj8l y0 tuoxyzywyr0tv h*ee 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 re nm zatm,fw c81,ogzi:. l1r:vactance 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 capacit ;ex v5khdu02for be 100 W?x d ;e0v5ku2fh

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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-iyqc*q2eda3-r8xvc3rhxem :/(k h7amF 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 w:n 97y9i6- nndchwprwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacinw-i9dwpn:9n yc7 hr6tive 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 1500tqqr: 6x0xk h5 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connex5hx6r0k tqq:cted 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 ai,s5g)+neb66n s +zo8htbk w ct 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series6w+i+h8 z6 5s,eb obsnk)gntc?

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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 conniw po40w-riz s-s-.x dected in series with a 20-mH inductor, what is the impedan- 0-izw x.- op4dsiwsrce 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 invtolt8 vzmdt)3wy59 4 series with a 20-mH inductor, what is the phase anglydl5z4 )m wt9tt38vvoe 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-m9vhey8 /2s.6qg6zrg89cv3l jwh pkta H coil and 1.0-mF capacitor for a tot jh. yk6qa 9rl8z28 p3wgvgtse /9cvh6al 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 capacitanci/z vob l. q,jp9w chmh7z:4vrkq k-96es is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200ch bl6j-/v,:oqzpi 74. mk qzv9rkwh9 0 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 btld.;t )m5h eie put in series with a 450-mH inductor at 5000 Hz for a total impedance o.)ithde;m t5lf 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 with a 100-kW resistodbal31 kw9ed 8qt*3/vrsaz *yr at 1.0-MHz for a total impedan3 3bs9 tr yevw/zlaq1dk*da *8ce 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 conailh ucre1n1+co)s+ 7 yu9/snnected in series with a 20-mF capacitor. What is the impedance at 1000 Hznoc s +1u+clenh1 y)ra/9iu s7?

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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 capacitorih3hu8e/ijadp5 - x3k at 1.0 kHz for a total impedance of 45 W?/ dhj8 kh iuiae5-3x3p

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needevo, 7xaoo;w 4hl hm22cd in series with a 10-mF capacitor at 1.0 kHz for a phase anglchmw7o;2 lv4a2,xooh 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 needasx u1 o.d0hty,; 4cffed in series with a 30-W resistor at 1.0 kHz for a total impedancef1hyu o0d4fas.cx t;, of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whcvf9y pjvx(580cjg c30:fvnjat is the phase angc9f 3j:ccy08j(gfx v0vj5pvnle?

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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 resi8yr a*/;p r4n bd g/w04xgmbfqfxy 5f/stor, 20-mH coil, and 1.0-mF capacitor are connected in series? *yf/rb5;gry4bnxdg8maxf / 0/fwp4q

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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 l21bk ,0cgzmd8rd) l 0srwl-ucapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms culd2 z w gr0mlcbr ld1k8u,0)-srrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 Wkow9 4k trpx7e .cf 6y,sq 6fjxvd-:8r, and an inductor of inductive reactance 30 W are connected 687d4 krxopsvfy 6w j-eq.c t,kx9:rfin 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 for a series RLC circuit containing a 50-W resistor.9k;gd x5 *drspgpmp,o kg:x: , a 10-mF capacitop o*rd g5g:dp xs.;g9p km:x,kr, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500kw ob*;k+m vt6ic wle/jco3 hpy)v vnd.5) f*,-W resistor for a phase angle okvhko ;,b ) v.)mw+dfy/tw 5o3*i6*e cvjcnlpf $40^{\circ}$ 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-mHj-a (am :h8++ppc fsem, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source?asph+-m fe ap:8j(m+c

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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. qp8r6 2yucgt bg*)/jltev*:d0 W inductive reactance, and 10.0 W capacitive reactance, when t qp/**gbt2j6er gd: u l)ytcv8he circuit 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 circuit ipi* jat;tn76ne7a. wg s $63^{\circ}$. 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.pr 8s:k2ud mk has an impedance of 60 W and a resistance of 30 W. What iskpsk.um8dr2 : the 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 resistobrnv3 ,xbqt0mu+h 6fp:ksv.1sk (l7gr, a 10-mF capacitor, and a 0.45-H inductor, when connecplt(7b qu.nfh0:361 kxssb,mkvv +r gted 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 capacito uhwbhc5d 4p 5wn+rc05qw0c-jr and a 15-mH coil in series?c05h5c rwwn-4+cduhwq pj05 b

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fre :0lcz.grc5mmx.1 mxwquency. .c0m x:g5zwc 1lrmxm 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 withsv*ldn1u n78a a 3.7-mH inductor for a resonant frequency ofs lna17uv*dn8 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 plm q*3z.si+ m. 3ojwwrjrub(r2 aced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to zosbrm(3rw 2m ui.wq.jjr+*3be 1000 Hz?

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