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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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 o.)(nrw+d;ugk aa cth8f 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 inductipc*,jfb, v4 xion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a co( c izl snzth-s;k/)/ail produces what kind of change on the induce-hs/ ( i)lk/ntzcz;s ad $emf$, 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 magnetkqu;vu / / -igrg5*mmtic field through a loop of wire produces what kind of change on the induceikgr umt;u/5- mq/*g vd $emf$, 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 o*st;.pm(p*ib7 ;edz d jsx:u wf change on the induced xb;eu *spw(.pmdtzs d*j ;i: 7$emf$, 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 fitt*7njl/1fp ys+nb; teld 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 induced cu b125 qtkn +;mfae1u )8fdnl8ds.gfvwrrent in a conductor will be that which tends to produce which of the following effecsw+.fngd 1but v1knfe d8qf ma8;5)l2ts?

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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 magnc+z8vrlxsq9 (yl a:8oet is held above its center with its north poler z8ola +sv:8l9 (yqcx pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tab+sl:qc fa)1o.vruhc ) le. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling maolrc . ah:1)sf)cvq +ugnet 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 r1hv81(tc koj h+3t8c +j.ksgpyhs+j a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes h+( jjv .8t y+s hphcrot183sjckkg1+ 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 rx(4( 3bmg w.ftp0vl dlegion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direbl xmg( t(dlfv0w3.4p ction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic rjth xlm;u.. /b o) gh3yx3s qe3zpb;1field points straight down. The magnetic field disappears suddenly. When viewed from abo);l/h3 b..jz3tmhoexsy; u1p qxrbg3 ve, 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 anduis o5,v8x+w/ qu3re4 vrr1y f2i z9fd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side o es/ ,251o4+qx 9w8ri3uvzy i fudrrvff 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 aylzmq/( np(e( loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (asp(z emnqyl(/( viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe70(4np q.dajxasm oj,ed 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 rotationnopj( sda .70xqm ,4aj 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 ac 0/n yn:dl ddn*u3rx2ngular speed about an axis whose direction can be varied. *3xr2/0lyndundc d n: 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.norejfn wf2 m* xj*426ynw:: q
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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 ani(f0k0po its: dtdg: i0jo2h) $emf$ 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 magnetic2:7ihwd .ka; -y 5cbw+i c tkh8lrwd,s 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 direction) is moved northward at cou(j hb7) fu8htnstant velocity thut)fjh7( h8ubrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vy *u1td28j63l xfkt poelocity $\omega$ 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 transfoww0ar/m4s grfo9; c3 ,gbjtacp .l+1u rms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The freque zvi)1ddf3 +zzncy of tz1dd3i z)+ vfzhe $emf$ 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 de81uyh k9a4mesb8n :szg4u) mivice 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 thrc*xv 2rs+ s9gd.g4mf at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the poni clml2*4p o1,sze sm /)h;lrimary coil then it 2 1i ,eo )zochmns/l4 sl*l;pmis 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 tha/ p p+jqna8l z: cz-4hq:lnoc9n the secondary coil then it zzqloq9lp : cpn/ : -c+nhj8a4is 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 ph7b3 xvy56meb ower 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 f*rztw cdw0 /q 3ww7.xcircuit,

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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 ser5u1ri:qdzr 2b 9 ;a2ktupfb w8ies to an ideal battery of constant terminal voltage. At the momen15autu kw rbb9f2 2zq:8;ir pdt 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 inducthb 0i;73k k5:n9am jjqar65ls jh wnj(or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the hh7;rw: l3jnj95 ajnkabq0 5imjs(6 k 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 conn 4y/mi4o*hr l mbkr1(eected 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 )5yf9b l1lt mfn xr,s(y0y*3 ehuu-uland 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 bp ; y7 et7kt,0tpupb2lattery. The time constant for the circuik,petl;7 b2ptt u0p7yt 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 battewmr1t)yhih3h6 e d m17ry. The battery is suddenly removed from the circuit)te h1m hirw1hd67 m3y. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have thtvg5 d1*hl0f lyczq), e 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 tz5lr hl1 1crb1o an AC power supply. 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 phbw)dln ; +vdlx4: 3xmi5(mb wower supply. In this circuit, the current nw+)b wm (d:ivlx4ldmxh;b35

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactaei9sbdvy9 j5wha3 g j7.k5y8wnce in an ac circuit changes by what factor when the frequency ydbs7 95ih e 9w3 .5ajv8wyjkgis 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 voco6 6h;,xix+ scj; wwhltage across an inductor is doubled, the inductive reac,x6sx ch6h j;wwi ;c+otance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acros: -a(xl+f3h 1r pdxwowjtsk -8s an inductor approaches zero, the inductivx-xft1d khwj+s:3plra o(8w- e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply.jy1y2v(wzj1 oo24t zh In this circuit, the currew yho y(j2zjvt214oz1nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactan5o op,c0kw ,(ub.fk i/okukj 4ce in an ac circuit changes by what factor when the frequency isfip.4k/ow, u5o0k j o(,kkcub 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 thx m0*4 dyjhv;p j-mva7e AC voltage across a capacitor approaches zero, the capacitive reactance of that capacito;dy-*j xv0ha4 p vmmj7r

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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 betweenxse45bztd q5q zt+o;zv*u1o9 the voltages of the inductor and capacitor in a RLC series circ5uzz9 4o+5tdq1eb;s *txzqvouit?

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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 a)tn s2b5c1 rbgn RLC circuit 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 impedance of the circuit incs . ud6r(q+nii, m6ldereases if R increases. When iim inls.6d(,6rd+e q us 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 circuit. The impedaow viz k05e.m:nce 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 impexl3/; t,ieg hp8dlxr( dance 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 8lrrxkf 2e) 0han LRC series circuit, the resona rrfx)2khel80nt 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. At resok)(h4. od vgqanance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriesc jq/utp*u 86p RLC circuit 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 radi .k0(xaanry:/a)d i1 ch y(otnus 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 and the magnetic field vector are paralc n.riaat1 dy( :(/)0axk noyhlel.

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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 uniform4,t;s ucn af*zp66wnh magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ofh6as uptzc*46 wf n;,n 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 fielmlfa4h3my )a+ d of 0.20 T. Find the magnetic flux through th+ml3 mfay )ha4e loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area oirf+*i91 u) r hiv*yzzf 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 coil ;d;,vxgu*s vn 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 turns of wire on a square framejq8gggjqy.0 l4 *1p68 p mjn,ogjbz t5 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 inducpz .mnyg0 t,lj1g j5og86 qj4pbqj*8ged $emf$.

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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 ty5uy / j1yct/xi lccd56(;ffy urns 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 amqg nb v,o2zt1,n6c4 ojc /b/and 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 wherek++ o5ukrdx 1y the downward componer+ duk5xk+o y1nt 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 lon;8i rknpkt+ /qa9zs) yg rotates at a constant angular velocity of 2.ysz8 krkpt +;a/)9inq0 rad/s about 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 a0os w.(pu7x rond a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire om5:labs+nb- t d dt d).v8ow.qf xai0+f 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 re27bk ptmssj8 0ctangular loops on its armature. Each loop is 12 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 genesmj7st kp2b08rator?

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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 wire8zz9xzhro 1: x 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 gen 9rs4e /;ha nw3vj.anderator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiesnv4w.naej3 / 9rhad;ld 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 gener+qzncdah35 q :wlcc(o8 h gh1;ator 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 resistance of 6.01m7eg2 2z axl.:jeal d.4wcft 0 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 Wx+dkz5 hi16 nl. The motor operates on 120 V AC, and when running at full spexdz 5+i1lknh6 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 W is c6rf2hgc3 ka y3onnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up ky32c6 g 3hfarcurrent?

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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 W5;k,7kpfh5t*k2rlmh)7pb 7y o hn pqk is connected to a 24-V power supply. The operating current is 1.02 hb; )hpmkfyo5ktk5,*l rphp77 qnk 7 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 connected to a 24-V power st +fgz-h, 4atnupply. The operating current is 1nz4,+a t- thfg.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 transforo;rci(9c1( lnz1z)bm pppd h/mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seconn 7cnilgtxvm3)j7ys g8y2 , -mdary. How many turns are in tg8vm)7nnc ist g,xym2j- y3l7he 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 theyd0kpyd9+ qste y+c36,,psrj 24-V secoej +yd9 +,ys3dpty6rqc,ks0 pndary 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 ofp*wt ,sfhgygr3 1*+b u a 500-turn primary coil and a 2000-turn secondary coil. If the current in trug* t*sh p+3g1,wf byhe secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transfox y 5)65dg* o/xagprjkrmer. Assuming 100% efficiency, how many amps at 24 V can flow in the secongjy)*grx5aox5p 6k / ddary?

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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 tranrewr :.(c5 jocsformer provides 7500 V at 10.0 mA. The primary coil operates r 5roc( :ec.wjon 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns -*qk vnz h/ jagch34n1on its secondary coil. If 120 V at 2.0 A avh1kn*gq43jcz/- hnis applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turp dr)1 h qej;+j6seu4jns on its secondary coil. If 120 V at 2.0 A is applied to the primarh u1j+q;)ej rj 6ds4epy, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu.0ahqhx1a d( urns. If the input current at the primary is 100 A, we can expect 0a1(dxh uq.ah the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20jd jegg0 rga -/tx8k :)jni61t.d 6fxo0 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secotj-6xng8jt .if ok g :0j/x6gad)erd1ndary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu l79kcik)hyagh6b5tk8nn(e 4c: w h2vrns. If the power input to the primary is 100 W, we can expect the power output of the se9t) y6ehk hgkn2l8 7w:hcv4 k5i b(acncondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uss/k3d; t/d s,z u/p ddp-)c7r6opnva dually stepped up to 4500 V by a transfo/dd-d;/d/ctu,odpsna vrzp7s) 63k p rmer 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 usually k6gtl5*hpp5w stepped up to 4500 V pwt*hk5g 65pl by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tne6nkvv6eg2hiz3l8 5 jzi3w* he voltage is usually stepped up to 4500 V by a transformelwk6v3gh5vnz26 en3 *e8izjir and transmitted 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 0jw7odxf7vmcn. 7tt w m30qj7 nocz 0(y g3n(t0.60 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 transfo (z7q37o m0xcntt0 (wvogd7f .myn 3cwjjt0 7nrmer 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 has a total resistance of 0 *a.u gt7(fe0 z;8by ah.zgbyy.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due t b 7hfgatyb*yu.z0;y.gz (8aeo heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at ; co qn04krz;jaix 4p,1000 V. How much less power would be lost if the power were transmitted at 3000 V i4az ;o rx4kj 0pi,;qcnnstead 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 generat0 sdwpit . gkc1h+sh*0or is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transforme+ ti0hhsk* dgpcs01w.r 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 e -oat9wgh6tu-nergy is stored in the coil's m a9hwout 6-t-gagnetic 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 ni v p/rkh5lw6 9hvc6 d*c9yn,contains a 6.0-W resistor and an 18-H inductor. What is this circui c9vwki56hydrnh6 l vpcn/*9,t'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 wherew+s:voz m1 hc; 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 s1d;f+pf1x)4rr r id upeak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placufbyi/-hi q p);caeyd;az;3t.2 s q:jed into a 120-V AC outlet. What is the resistance of the lae- y23hdf:a.;tqci sy/u;j izp;)bqamp?

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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 c3lbvd1 ,9 88baozax gkurrent through the ak ,dxg3vob z881alb9 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 n:+ vestnwk52 120-V ac power supply. What is the power dissipated in t25:e vnkst+w nhe 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 rehi by4t7krn)l uj+9a/sistor 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 resistorzx1 ki38bukpig6x3n8 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 resistor is0n d0pa00pl-/o6 z fq 6-ouuax7t lcwe $I = 0.80 \sin (240 t)$. 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 1.0sd+m-jvqa,tn j2 0ebp )rz1b8-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 oum2- ddah a/a5;y 0l+s+knvaapzso) 0f a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH cp goes5zgt:0-vi(i3xoil 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 atx 0 c4d6vin)tri7g ,7nlaog:g 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-ah28v2rpj y u(eqlju(/38sm 4cndwj frequency of 20 kHz ish-m4uy r8 (2due8al2cwjsnpj3(/v q j 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 uj -tb c;83h8 ibacsf2due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF c izo+vf3:mliy nz70x6apacitor 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 80.hr 0-+vn6-etko m( c; nssc hgsqbm+f4rnm 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 +2yp4l)t.on ,fza0h 6dwrlqj7 dfn v*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 reactance of a 0.010-mF c7bw(ipzd7 +bcw: :kk dapacitor be 100 Wdbk (wcw77:d +ib:p zk?

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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 1000 Hz and 5.fw (+md4rpe6cyef (e)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 circu223jznp0 dqcf1 (j8 ec, nshxj/ 6aejvit with 12.0 W resistance, 15.0 W inducticn2(fje vnsj,6ap2ceh d 30/18jqjxzve reactance, 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 1g*e(efr5 w 9i+uegh1byvdb 4r f.h45 j500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?*hfg4v edy(5er5g jb w41i.9f+rhebu

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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 resistd9-+y1csl fz.vo*qm bor, 20-mH coil, and 1.0-mF capac oq dy c.m1b-+*zvls9fitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductq78: 3px u+tejpg4kqg or, what is the im4q ptjgexgp7k:q +u 83pedance 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.m m)g-ws,ulxyr8 (mz 20-mH inductor, what is the phase angle at -rmzmy ,w8 )smu(lgx. 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 i; m hwhz66xsuwkj:s 42n a series circuit with a 20-mH coil and 1.0-mF capaci 2;k h suw4mhs6w:jzx6tor for a total 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 zkl+gvlzyd0y )3tyhhmu rjvc23 bs +x- .8c9:needed in series with a 100-W resistor and 15-mH coil to get a t m+c3u -9t0 gvrykzh c2+)y8xbdhvy3:zlsl j .otal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must3eh9kvlswmn 96 de8 b5s al40acj, b6t be put in series with a 450-mH inductor at 5000 Hz for a total ibawat86439n sh9 jlc0m, ek5slbdv6empedance 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 g73tb yevs15fput in series with a 100-kW resistor at 1.0-MHz for a totasvtf g5by37e1 l 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 seriesg(db42d k z a(glrl 37:dj:ual with a 20-mF capacitor. What is the impedance at 1000 :4gl2uadk b:d(dg (r3jl a7lzHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a to-5hl5* p +uikrbbwtkacu: m0 qxdg o)8+:1ezs tal impeda o+1ks - :dcw+q:ep5zuhibbtrm*x8g k5u )la0nce 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 6- 6rbrasuny )xik;7mat 1.0 kHz for a phase an6 ay- ir;r mxks)6nub7gle 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 intc 22jdtc 70,c geyya,dnp n/* series with a 30-W resistor at 1.0 kHz for a total impedance opty,jna2gdyc/ cd*t,n 2c7e0f 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 aywe 9l tn8i8*wt 120 Hz. What is the phai8yn*ewtl w 89se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 H:v qi )n,0eshqz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne)v:qsehq, in0 cted 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 consistsxfk;w+rumr *1tu) kb 0 of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit fkw +u1;*r) xrub mtk0is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and*vaguzr7r )y77 cs h9a an inductor of inductive reactance 30 W are co7 vc)a*h 7uar9 s7gyzrnnected 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 for a series RLC circuit containing a 50-W resistoj:t g9f(z :mozfk2;em r, a 10-mF capacitor, and ezjo :gmmft; k:(2fz9a 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+ yirn3n hjuhi2+68la series with a 500-W resistor for a phase angle of6l+i+ra8 i unn 3hjh2y $40^{\circ}$ 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 circuit160k5wnuk nf3c5qr a,ip lh)u has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxik5r ,q5i16nflnuha0p)k w uc3mum 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 W +e +s:yr4hsy,ff* mzmi*s +mfy:e4shfzmy , +rnductive reactance, and 10.0 W capacitive reactance, when the 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 cco:ljtj+kw7bbzxfezvtk-b1i3 2 5 )3yc0k c 0ircuit 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 impe(9uoide) )v *w-wfnm e+wk0r jdance of 60 W and a resistance of 30 W. What is the po ru-v j*ewo+)w0m(9fdn iewk)wer 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 circus)am u5d 4+icm3 r-hrvit containing a 50-W resistor, a 10cvmharsm 5+d4-ru i3)-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capakdr/q h;v1i g(citor and a 15-mH coil in series?hqrv/g d1i;( k

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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 seri:( 4 ip mqhhdz,b- jck5og-fyq1+bqy.es with a 4.7-mF capacitor for a resonant frequency of 1yz 5.(mh4 khq1b-cpy+,od i-fgqqb:j 0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant huloem s*vgz/*h16/t.5uhlc ..blnifrequencvhu lng u6bi*. 1ch//*hl5motse.z l.y 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 mustp (n64:weqm wtn 8t /kzdtm65m be placed in series with a 30-W resistor and a 40-mH coil if the resona6dwm wt:tmnz(p6mtn8/e4qk 5 nt frequency of the circuit is to be 1000 Hz?

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