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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: 游客未登录  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 magne, d 6jvpt /2mloy*(vpbtic 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 inducco j)53 ffk,kts zj55ltion 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 coil produces what kind of change on j8dy,y/ huwf;.b kmb:9/ vozi tfb: id y;,vzb/huy8 j9o/ mk.whe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the m/ehx*rhle2/ qjxk 64b agnetic field through a loop of wire produces what kind of change on the indurhe4 jl/6bhxe/x 2*kqced $emf$, 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 cpj,jsj+5jh7 lhange on the induce jljs+5hj, j7pd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field *d7,tsm 47g5 ynl1zic 1dswzyan $emf$ 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 current in a conductor wlao rk:qnx e 1n+nj7ant)b8x. )x+ l.rill be that wlojn)a8l +bq. x r71ta.e :nnn+)rxxk hich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abor7c(7 czvd5gmini e9:ve its center with its north pole pointing down. The stationary magnet induces v zcr :7de5nm7( gii9c(when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is 5 a o)hz)p bvh57w:j+vxxzst; held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magntao5 )x xzbhvps;+75 whz)v:jet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a regionvxc4mpb7 v5nvh 3b45i where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currph 5xbv4c5 v3i7 4nvmbent 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 cql9at u9e/ k9the magnetic field vector p/ taqk 9l9ce9uoints straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table 2 f d5murfcck 6h,:;v5 rjmt4btop in a region where the magnetic field points strf4k c2rc5ju6 v:ftmm ,d;5bhraight down. The magnetic field disappears 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 a-) m6 doz8(kiy(mm,wj:oc* is2bhq fn n ever-increasing current northward. Two coils of wire look,cbm h*:sz)6wji n iym (-(qm2d 8fie flat on the 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 th;nrnt9; a2g fpkdh1d0e*uzp2e north pole entering first. As the north pole e 2;e;hg9udt0 2d kzp*pafn nr1nters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoskba- tg,z3uy/ e direction can be varied.3gbu-/zkay t, 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 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 speed about an axisr;p x b+dmx(p5 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 rxpr;+b p5mdx (otation 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. q;(3xehe:xl iz1ha g 4dq-yg1
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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 thaupv:vv i0 fi)-cy :gp,t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fiepasqv.n+x tn :l-l;p4ld. 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 thl51r8uurnx4ib/u jx3 e east-west direction) is moved northward at constant velocity through a magnetic field 35uj1bx n lur8ur x4/ithat 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 ci bpo o02odtc +bqzt61+ z6dn/onstant 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 spi-;cr sp +cc-w- uyk63+n xptransforms

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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 eachpizm3o(9 55dsbvc4iy second. The frequency of theip55yiv3bdc (z 4om9s $emf$ 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 useidybhxd 3 +q a89x0om* pmzehgx2 wv :xx5a2:2d 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 devup t-t+t): : zxwpxf;eice that

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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 loos5rxuq g 8br.)ps than the primary coil then it iss .gbr8xruq)5 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 loo8y1o*l5ay( c5 dmpj4;pulgnbps than the secondary coil t8j; yy(bg41ndoml5cp * ua5 plhen 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 8n*rh8 w/ 6wl:t0q, lrvz3nacso:w axpower 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 resona oe 7wues(qbo7ba2;4fnt 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 c*nefyiyj59v28wo :h1 nxxk/ lonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosnoyx* ef8wlk5/v2i hx1jyn9: s 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 idealp8/v9n dp cdc7+auj)o battery of constant tp/)dp+9 an78ovd cju cerminal 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 resistanceil(e7iv- ukd (2m hqw2 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 isdk8* r j l.fvlu8wtdow4;ns.- 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 toqz ie2q96 )s-rwgoyq + a battery. The time constant for the circuit repq+g)6 es -qqzow2r9y iresents 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 a.0 ;jg-n khshyre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents hyhjs;.0kg-n 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 s.ldwi 5tqatf14le28n5kniv rkv ( g+2ame 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. On this circuit, tq,jm7.i phj3b)a . nfxhe 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 sv;r m. 6s -ez4oypmulc y;.jt.-c 0pkeupply. In this circuit, the currentr.s ;;o-e.-ptz pyy 0ecjk6vcmlu4m.

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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 o +ed5zkkqab 2,h, 0+oilynx3when the frequency is tripleioz5h2n+d+bxkq3l, ey0 ,ak od?

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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 doubled,r) *-fl4h2 k7ywtqlf e the inductive reactance of tflrt72 *hyf ewl)-kq4hat 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 across an induyu(-+ hwk:i*fc prg.idnzk, , ctor approaches zero, the inductive reactan :h.-dfp,w+ izr(ukic ky,*gnce 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. In this circuit, tc8uzp/3u .j+rh7lzt/aabf8a he current7/ u3cr .hapf /azaubztj8l +8

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when yrj5aebxx j ,:9 6idyun0.t+s the frequency is tripled:uax 60 it+jjs.y dby en,5r9x?

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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 voltages l .dclb(im.() fq8u* fy+ulu across a capacitor approaches zero, the capacitive rl)8y+ f*.(silubc f mqd luu(.eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induct7j;izky9x txrqb 9., sor and capacitor in a RLC serijky9bzxr7. s i ;x9,qtes circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circui;q,n) tn *jbiwt 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 th5ot* a n)t-tmh (mqs rtah-x4aw8wk2*q2* xske circuit increases if R increases. When is this statement tru xwt* t 52 -ma8wtxaan os-rqs(t4kh*)2h *mqke?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ib)jwh zn i+.v4f $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increa+s; lwgqv; hwuq0 b3h3ses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC sp5,uwx: a4b2 xy7w9do klvhn7eries circuit, the re,uwa 77npyobx4w2kh5 xd:lv 9sonant 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 circuitfg1( 9 dp2rtlx that is driven by 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 circuit occurs w,ts8/bte rot 7hen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatibxk5a/-s:fhw rt33bj/wko -z ; *xu vcng 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 fiel*k;b: f-hwu3azcx /kr j5/ tbw3-vsxod vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of (1x0qoujmh)9+oud zxfh* hhr (/fgw70.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic h/owzou9 ujhxx((d )7hhr1fm+g0f *qfield 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 rota4fzvq cu55, u8fwfmp, r/-3 phn iyq,fpkg/l2ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnem2 g5ffu p v4wyk/zn p8- f3lh/,ui,q,cfpq5 rtic 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 areb0eg/ lk(2 cdha of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from a)ew 3nkcgk *k+u8sa27d ly .xbvrq .0$4.0 \times 10^{-5} \; Wb$ 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 frame with sides 18 cm. 5 :dz15(6c ws wkgsq.pby+g bwA 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.cy (q1gs 5:w65zb +wbg.p dwks0 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 turnsb vj8 n18zmu9h 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 andq-+ b-dh,kecz 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 ou)v e ,o7lyzlts3uwzr6*j5 * ff 60 m flies horizontally at a location where the downward composzywtof**r5u3vll)e7j, 6 zu nent 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 constypv(yx jmeei:38 4e(gant angular velocity of 2.0 rad/s about a vertical axis through one of its ends weg4i (ymj : peye38(vxhile 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 cro /waim;. c,gaq9w) zl0n jno;oss-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 consisacg-gmpx1xoi+5m 9 d1ts 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 arma96arcj -ru7sk/97htohr*m ll ture. 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 h*7 u tr99 k6solhjclmar7/r -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 o4t( xua ;uc:s4rqj (evf 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 sixnz)69tq aj +)cyc+nr mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the nqtj+rz )c)+ay x 6n9carea 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 gidfjr d +57(cbenerator 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 rlc 0z0r v5n9clo1/iw-arbmj ) 5xx bp7esistance 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 5l/9b*c/2rgy n h.ossp6m mfv of 6.00 W. The motor operates on 120 V AC, and when running at full speevnfmc/*5 g. s ys/ mprh6l29obd it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplt8 6yc--0jtrw/trrq hy. The operating current is 1.0 A. What is the start-upj06 qrtttr8 cr/-y-hw 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 power0xtbghacp/j jov law ,yp0,;e*48+cq supply. The operating current i0 ;vhaj q8wxb,ep,j0 ct*lgc + oapy/4s 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 6.0f no8s v04rbnte090 xc+n e( rwiv(se, W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. rtc0f n+8nr(eosvs i xwen,9v0be(04 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 voltage of lv:w tfbv7 jtny1a-hsj:6/- o$120 \; V$ 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 pr(ig:8 b y0sducj 4b*6wz5omlp imary of a transformer causes 14 A to flow in the secondary. Hp804u65l zcm*yb dogw( is:jbow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V1ts6t: adv6jdjibz z sg7 ))c8 primary if the 24-V secondary has 1:zis)va7djgb 1668cz t)djst00 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 ax0 fs;91jm swup)3mzs 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary? )w1x;szf 90pus m3mjs

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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. Assuming 100% effic/+kv9oq6u od ziency, how many amps at 24 V can flow in the secondary?ovd/zqo u+96k

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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 neo/ np mfzv8e/azs97h/ 7l4uxa.xebgi+n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doeue7sp .fg9aeix b/ vam4xh/zz7l8 +/ns 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 an54n8wx ys 8miim+h )x)nc e.qkd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary5ckeiy x+)4mq xis .w8n)hm n8?

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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 y 26,*t(qtsxhiu h .se60 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 current is present in the secondary? uts2hs(q6t* i, yhxe.

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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 and18*qq5h- j nkeqkp mm( its secondary has 200 turns. If the in5k e (q-n*jqq1 kmp8hmput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1m ympxl4dn-( 500 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, wmn4 5xp(ld- yme can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If m,zz2 /mwysab 606d:t bilqz ;the power input to the primary is 100 W, we can expect the power output of th6y;i zmt m/absd2b zz,qlw:06e secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage lwr 39tcuk3416xo ts tz5 4+ cnldguc7is usually stepped up to 4500 V by a transformer and transmitted through a pow cnutd5 g+ 3u4slr t4z6kcw lx1o7tc39er 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-)mnd7z:h ozm ssz525: etkdv current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totasezn zz::s 5)2 vmk-5ddo t7hml 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. The nz *j3d*xzsbo*l(cb.s v)-wug 2 b:tkvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 *dubt*jbbons vw. -:g z2z3s)klxc (*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 generaxj*t 4zc);kd dbi(k/jtor 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 lostj j bzt/x4k)idd* k;c( 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 0.60 W. A generar1 mr36)xhqa :jm0zz2id( px vtor 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. Whazi3q1zmmdp6 :rrj v 2ha x()0xt 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 i wj;rn/,jcf8v. .ki m hc5.xaline at 1000 V. How much less power would be lost if the power were transmitted at 3000 8.haw jxc/v 5ik ijr;.m.,ncfV instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be t s/d(cv5bec n1zl 0.;0b aqgeeransmitted on a line with resistance of 0.60 W. To what voltage must ths0l5qa;(v c .d0gbn bezce/1ee 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 or29f* s xxa)j 2iuj5bh yuy30sf 5.0 A. How much energy is stored in the coil's magbu5sx yfah903jrjys x 2 *2u)inetic 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 a1 .;iy* :x2go xgvscx2 k0pnxf 6.0-W resistor and an 18-H inductor. What is thisxxs* 2oxggpi 2n1y;.v:ck f 0x circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 1ixm1wxe6(- d p20 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 outleq4fwc o1kewo)ivfr 3+hx,1 c3t. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resist: gl 3aib) dz85y6xlrmance of the lamp3l8zyadx) i: b56ml gr?

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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 i448; pmua m7+i dl,qma oszl0es the peak current through p;ai4qelms 0 o 7+zdm4 lu8m,athe 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 supply. What isulo/8z:oij tnfmjwur ;)--7 g the power dissipated in the resisfomj- :tju) iw- o8l/zgrn; u7tor?

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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 resistorpts:9g*bi6f 8xyjje2-v tguf35 ao 6v 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 resistor,ai*x:(5uxh/l npdsoaz 3n mpy j jrd )3:7n8a 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 xmw.2cq *)bmvresistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H0 ee71wd6dh owm bc o04s2x(vrz?

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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 * rpr9i7 9ib dwemq28rat 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 indugi,sc( 20. qnt0yyssa5b6l edctive 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 i/ mldjr(h/48r,s4m2 pk junkW 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 120 V AC at a frequency of 20 kHz oo fb65 2ru abpv0hm;k:u-c+pis applied to itafbb2 6;uru-mo0ocvhp: +5 kp ?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sou g of-osk +a*cg(7o1t mse4k p 9f9vpos4g58dtrce?

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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 capacitor p9nx5+ced2- cy:e p pwat 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 1f 5)esm6cj kjcapacitive 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 twij5 x5h0m+ be pu zj/7jii4210-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100g r2(hs xu4 7y2l+mmlu W? g2 um2xsyu+4mr 7ll(h

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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 throug 69hips6q a2huo*6yrkh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit d8t+. mi. aldowith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reil dt .+odm.8aactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coilmlj;0vtuu5u2x. wni 5 , and 1.0-mF capacitor armn v52uj; .u50uilt wxe connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-Wd5po(f z-* 1a) iu2viozwzk4c resistor, 20-mH coil, and 1.0-mF capacitor are ado 2- *vc f(w4 iz1kuz5zipo)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 con78zj4l24dauf66s gw6ylh g n lm)pry+nected in series with a 20-mH inductor, what is the impedance at 10zns7 26 g6m+luh wjagyd6) rf84ylpl400 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 if kt9+y7v rfnr 77gw./ n9qxtgs connected in series with a 20-mH inductor, what is the p kxy7r9tnrwg/t7 7q fngf9+.vhase 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 o 4k5yg6vuba0coil and 1.0-mF capacitor for a totav06gu o k4a5ybl 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 9sqbo f00g r+v k3+/at+s.jps zmwdz 0is needed in series with a 100-W resistor and 15-mH coil to get a total impedance a0zf+9 0j/v0+.os3wmgbr +qst kszdp of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series witf*idhg3c;e- ph a 450-mH inductor at 5000 Hz for a total impedance of 40000;3hpc*gf e-id 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 resistor a:logd29* a7/m qt*t v lf;rlmzt 1.0-MHz for a total impedance of 150 kW? l;/lla9gzf:r dt *7 *2mqotmv

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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 l1sl*0ug2 v( *vnhqv 8 ozx;izimpedance at 1000 8*z2ui (1v; ol sgvxlznqvh*0Hz?

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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 se+t0-bjb(8jt 8 bzl avvries with a 10-mF capacitor at 1.0 kHz for a total tb(+vlt 8 -0b 8vbjjazimpedance 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 ce *2n -3 )am3vbeqhla(efw2xv apacitor at 1.0 kHz for a phase angle ofe2 *x23e-awnmb el)f(hv 3vqa $40^{\circ}$?

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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 resis y71kor d(dqu xoj(iv3z5lp).tor at 1.0 kHz for a totalv y d(o(oip)75z.qkxuj r3dl 1 impedance 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 1207su(n ppd 3rp7ir9 /ia Hz. What is the phase anglru7 pii /3ds7np 9p(are?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20sai/ znu57d:8yanu:pt o.h mkux2, 46 -gaf bs-mH coil, and 1.0-mbh.4d7ut skpaz o2u-gsu a6: 5/axmn8y,: ifnF capacitor 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 circuit consists of a 100-W resistor, a 10.0-mF capacitor, an5a- xkix5 k+fkuv ytzk(k* o3/d a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ik txvo* a/fzkx(5kyk-i +u 35ks 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 cg:fqtxvdvrz0jcw;vs( c+:yj -; ib5(apacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power j r b ;jc(v:;5isvwc(z0x :dygq t-vf+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, a lyt3l)q 6q2 d xn2.pizjh9ju) 10-mF capacitor, and a 0.45-H tdqyh2 9l6z )u3 .ij2xjlqnp) 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 necesp (nvwko7ub9: sary in series with a 500-W resistor for a phase angle of :pwk 7(vn9 buo$40^{\circ}$ 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 = 265m plte - 7i5oi5mpbg0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivingeil tp-7mgbm6 55oip 5 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 tq:xsf+7 ahf( with 12.0 W resistance, 15.0 W ind7 thf:x+( sfqauctive 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 circuit is.r2a xkg7fwk/ f u .4vmjfev0ao) x4a0m,d9ty $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What f8)fqszr925zs bi+b 8l-o 8qv skob9 uis the 8 f8rb+l8s2zuiz oss)b-9 9bkqf v5oqpower 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 50gp0*omsmpqyz 4zzzyn7 6) pv34y ki5(-W resistor, a m n5p40z76q)yy m* zvz3ziy pspo(4k g10-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 w9h((3;tb5hai2fn yyh15t 0fefq trvfrequency of a 1.0-mF capacitor and a 15-mH coil in series?ynh qeiy190h25a;r(h t b tff5fw(3vt

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is need0gx+r w+ibax ;:eqv:om3a lj*ed in series with a 4.7-mF capacitor for a resonant frequency of 10 kHz?lb :o3vxa e:i q++gx ;awrjm0*

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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 il gseu0-fxe -.b2d at0n series with a 3.7-mH inductor for a resonant frequency of 100-ebexa 0-dsl guf.20t 0 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 ppte0eo :gn19 rlaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzo p1n9teg :0er?

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