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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of jrm):ym-gs8 b/v6nh; g iyk6 amagnetic 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 that thes1ouqd9h (w,u $emf$ 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 kin;q,mjg2nko 2 xu;,g.h 0v dvcnd of change on the;xg2ngh j; 2,v cu,dnok.vq m0 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 magnetic field thrye9ha ;a)g0s 4vae l3,nrcy -sough a loop of wire produces what kind of ccseaas-v3rg 4n la9,ey0);y hhange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire producez o.e yy2 6;kz2bt9 e:3wqpheas what kind of change on the inducezw9tk3ea bhqp ;6:y ey.ez2 2od $emf$, 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 map,y,d+r n m:uognetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in --bz(oo 6qjuz a conductor will be that which tends to- (-z oqbjuz6o 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 horizontalukeyc c j/(b2ga+:ur d z;3mz9 table. A bar magnet is held above its center with its north pole pointing down. The statcc ;+ejky2 u/r(ab9:dm zgz3 uionary 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 ho4pd* rv4 li l0tv5ya)xrizontal 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 (whlx id4ral vv)0pt45y*en viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic ftpl9s8rd,au0y6a /gok+z wz3 ield vector points straigpg9k s0 uldzw /tay 3z+ao8,r6ht 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 magc-6g di1xbip) netic field vector points straight up. The magnet d1g xii)pbc-6ic 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 top ip5i (kfmc d2 p l;blod8q4gf(8n a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction ofd8p((cb45o ;pd fgif8mklq 2l 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 hor+y-k6 3htvcltll:w 7 eizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tac:lhl- e3v 7wlyk+t6tble, 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 f5/zbz--0uhek kbyxct2p z 2p6 irst. As the north p0xzh/e czpby5u-2z2k pb 6t-kole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spelimgo - f;8e/ged 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 rotation iff-/ ;lieg8g om 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 axi /n1p7wjto dj6s 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 rotation o16t7/d jpjwn 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.i*t7u 3y0yrluj0 b.n t/-rc vh
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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 akr+/(o+sh n5edfv of9 n $emf$ 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 fieeh5et 2k w32snld. 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 ek*x flq r03c9gvbhjjrxlla;x+ w8l 28sw/.x)ast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potent b +r.ls 8l9gjafhxrq 2cljxk8lvxx 0 /*w3;w)ial 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 x lkefaj7e26 w 1jk8m3velocity $\omega$ 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 transformsjwt:hxyvf 0h-(nj l/8h/0n 7urv7t as

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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 thro. 9ve*lbe h(kdugh 60 revolutions each second. The frequency of th9*he. lkd ebv(e $emf$ 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 usedo 6-j4o 1*ho r+idztw7d sr(g2jvw g+y 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/:qh4a6 -fqzlc (b,qwdxb-u9 jt lo6h 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 lo-ea 2*j v/(8v -4lxrndelp czsops than the primary coijez 4-dv*e(vl p ac8x2nls/ r-l 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 secondary corkdzn-/b) 2ivil t) 2inv/zkd-brhen 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 power ax(dzt,x 4b3s 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 circui7lbtwo og o.(r14ia -nt,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideali65 ykcz l9vns)vq+a. battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosakczqi6 v.9 vs 5+lny)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 indvqe e44cbsdfq s3)yz+ 8.p a5cl9ey4 puctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagee4pzvq c4l py.abqsf89)sdecy 35 +4e 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 induct *w.6ikvo3u vuance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectev+1qwvrq i wg w.ne/ f3 zp+6d9v1lqr(d to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time constlh41eqh0*;t /9qjvfz +n jfoxa8x tg*ant for the circuit represents jte halonxg98;t04zv f*hx / q+ jq1f*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 zw jg o yi/korgk*+-+5xq3z6n battery. The battery is suddenly removed from the circuit. The time constant for of the circuit r*yqi k r 3o/ozk5+znxjg6w+g- epresents 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 thhq/r--lk*jc;cpw 7 .+fn nzedktj c 55e same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to anb,+thbapt b)2ib,.zv 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 power supply.p6-o8olpg3 4ayj gcw1 In this circuit, the current6 j8o-lyop3gw ca1 4gp

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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 awvuu)4 32(f o+ vu vf5au.uokac circuit changes by what factor when the frequency is + .)ako uw5uo vv 2f(vfu4ua3utripled?

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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, the in d3uei d*tsyd 36p:xx/ductive re x:xy*6puste 3/ddd3i actance 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 across an inductor approaches zero, z0j mltn )abp7e yk .3y8ypt7+the inductinl3. p+jytpt 0yema 78bzk)7yve 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 3:d 1wydkvszv9d xk)5 connected to an AC power supply. In this circuit, the current1k ddsyxwk9z5d3 v:)v

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanljq6y d1 i5yhs /a6or-u4tr s/ce in an ac circuit changes by what factor when the frequency is tri4ua1/ d/r6sslyh65-t qij roy pled?

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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 0l(oa*j: whc hvoltage across a capacitor approaches zero, the capacitive reactance lah (0wco :h*jof 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 thl swlt7;.e +h+0lmup pe voltages of the inductor and capacitor in a RLC serie7hsm0+u ;l l l+.wpptes 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 circuit is defined c 0-n a ;p-kgbi:voj7:oh( zadas $\cos M = R/Z$, 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 th b9dw; omfv 62watta-u9ij2j+z-y)r me circuit increases if R increases. When r adu)bf9 wmm tw6ja+2y - t2;-vjzio9is 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 impedance of t4) hmltwknd*m 1lti 2-oz1 4z5qk 0cizhe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of .zg:h uem.ni (the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, th3;fu8 kj( ,4wknvwffp e resonant frequen8wfkfpvw(4 j 3; kfn,ucy 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 drivenz ycv7hu5ri9g pi8xpm( +i mpjq)2n/; 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 when a;sw ,lc 7 toc3fj9j+nd 6gef,cn0an:

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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 rotating in a uniform magnetic field v5:s nt2gdig+zg06koj 4c eh7of 0.20 T. Find the magnetic flux through the loop when the plane of the lo2 sk:o vgj64degg +nit7c0hz5 op and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic f fd82 ihq48dnxield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicx8qd 2ndi4h8fular.

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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 qp:ae 3h p**yew5a -ohom2x8jrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thmwpa hxae5qo 3yp8o **-ehj: 2e 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 of an adjustable single loop is reduced frov k59(,s zewhsm $1.0 \; m^{2}$ 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 fbhwsw. 2p8p 1yrom $4.0 \times 10^{-5} \; Wb$ 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 200b 88cdwow i*k9/iuk4eghls9e/m6q;q turns of wire on a square frame with sides 18 cm. A u4k hu6 q9ek8 8m lcw*bedi;/iq ws/9ogniform 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 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 cm+-;y ll-1ur/x,tlyt+z vxm v3l ud2with 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 andw1 vf)+,isnc-f2ti c/l pokc) 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 horizontallog*em :xro s:)y at a location where the downward componen:r )eg osx:mo*t of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angula764 mvo0m hktsr velocity of 2.0 rad/s about a vertical axis through one of its ends while ios7h mkt4v0m6 n a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area y;+*5uwp r yicof $0.25 \; m^{2}$. 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 ofhe4m+3 p sn5z1q4wxp abrw. 9k 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 armatui fn g5vwb5fx)b:,+p bre. 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 p5nf :vbi )b w5gb,x+fin 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 turn*zr0uf8mx g fuy1wulqi2 n0 7.s of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generatx:4y. j2,tih5 pxgd fr;lcl7 dor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the tdipc h52 ,l;xy:j4 dlfx7r.grotating 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 maximumf4kdu-rg75g r $emf$ 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 vhf g :s0+hm jr2i5wk4 s0x.xgof 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on y):la u,f p8fuev*;yfq po8 z)120 V AC, anle)ff:a)8yy *qvu ; pz8,fpo ud 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 internal resistance 6.0 W is connected to a 24-V poweyw vnhc+ 6(2jdr supply. The operating curreywv h(j+c 6nd2nt is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sugbdjv b:n my-n.; fwzrmmo7: j+r387ypply. The operating current is 1.0 :-.7vdzy 7g n+wr fyrmojj:m3m; b8bn 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 supply. +d +ka qhg-2lmThe operating current is 1.0 A at full speed. Wh k-h2+dgla mq+at 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 volts7s ,mqxw v6 w;5e ht+02s8nbsar(yddage 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 causes42 mz.g juvyx- 14 A to flow in the secondary. How many turns ajxmv z 2-g4uy.re 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 tur*1 2himlvjv u6ns are necessary in a 110-V primary if the 24-V secon6 u*h2mj1vlvi dary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turnz vawz9hg+2 i: primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wha h+:zw2az v9igt 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 transformer. Assuming 100% efficie d n ;l,fcph+vgw(v7(mncy, how many amp;d,7n (hclp+m vvfwg (s at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V a6 g,dyqz u e,:n7bkfc;jx p40i 2je2fmt 10.0 mA. The primary coil operates on 120 V. What does the primary draw?dj g,k;2x:ifu0n4zpcm62q j fe bey7,

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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 on ryx8 otg8eulf 2bh,t.dc1v7,its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in ttt 7ob81.gf,ycu,v2exdl rh 8 he 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 o ,/a0qil vzt+;npp amd8a w2p7: xyg/en its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 d e lvp2;+a zwna gixq8pt,/0/mya:p7A 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 tranug/rkg6 .lc-ko3xqw: sformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we -krul kg /q x:.c6gwo3can 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 transformer07ji-zv3ta qj dgfu kujf2 f(6 vfnx9ud(3y,6 has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vold3aqi,2f 3yfun 7u6u6j0jg((-tfvvkjx z 9fdtage 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 transfor:jiq oc9 d6ug7mer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powe 7ocuj9giqd:6 r output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage im(kh2ac5tx/:fiqdn -ye9wr 4 s usually stepped up to 4500 V by a transformer 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 turnh :42-dac/imn( 9 etk5xwqryfs.

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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 ster(u 9hgkqivc/ uze. 6(pped up to 4500 V by a tra(h/9ukzvq.u (6gri e cnsformer 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. The vol8nkaa 2p 5ccq-tage is usually stepped up to 4500 V by a transformer and transmitted thrc-8k5c panq2 aough 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 lo67h +*py rjdctg/l. ve6*lpcz ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the or*v6tllp z gd*re jch.c7 y6/p+iginal 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 77mjx.+:9mt/ii5n vrt2t ya qbej tl1 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission l7tlmey tviar1.xj+5nt 9/ 7jqib m2t:ine, 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 ak1xyw r** -by xc*n7ci 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 Vk ynxwcbr7ci-*1*x*y 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 tr12tabxf b+e gt 46 cdo:s+v4b: hxnb)o be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if thh v++ x tb 4bt)6b d1freng:xbo:42sace 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.rxzq(w ,8.zfct2+ ta gi.1tbp0 A. How much energy is stored in the coil's magnetic ,(rz1 x+zpt2ai..qctgf bt8 w field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inel 3h ;a0e acj.nay4a/iw nd3w/+vb3aductor. What is this circuit's tinn.al i/ 3jwb+cya4h3wa;ad0ev/e a 3me 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 z uyv5esg o/rz1)(x8v120 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 6)3e3,qc ft 8 ogoieatthe 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 AC2 k1vkkf3: 1 hj,yjea a*rqrd8 outlet. What is the resistance of the lamhre:k23 adaq8rj,vk 1y fk1*jp?

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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 powewpgn0;tmr2 g90 nws; br supply. What is the peak current through the resistor?2;mgs0pgbw ;0trnnw9

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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 pow vbq1h8grhnmndzcxxlb o1g 1/.g -8.4er supply. What is the power dissipated in the resiso8-41gnqzbn.g1v c. 8 h x1rlgxm/bhdtor?

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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 dz/+u(oku+ . t ih: vlrjscgr*88lao8resistor 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 ua;vj1 s 5ct6o9yo6dk50-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 resistor ishm /p3mja*0 ps,9a,e3b cxcl,)o(rd)np wqf p $I = 0.80 \sin (240 t)$. 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 p7 uj.6;zh: o p1uazdg1l:29szybhry 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 an2nh -j21tyrfora 02 w 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 coil have 14.0 W of inductive reactanq0hn )ri+r8bt5jwu c5 ce?

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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 0cvcv8:yqi*:tn f7g39itk q d0zha/ereactance 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 frequenck n5:mzab8xz 3 l/ye/)hmk5fmy of 20 kHz is app /z:ya/m5 ne) 5 3hlfk8xmmkzblied 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 toe mbz-,u h57sy 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 capq6 b:em+hg4 laacitor 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 reactanceh vh45zzk o0(z inc0u- 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 capaciezhpvsa(r0.6k j ar:8 tor 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 react1l*mb(g.pj mybzqh d7.p**ue ance of a 0.010-mF capacitor be 100 W?g1*pz b.hydmm7. qb*upelj *(

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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 *,o,tz fl:qmofhzl0.0010-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 wixbg+ywz .mdo,74v4/otx j on*th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reaot o/+ 4dymxxownv7,4b z .gj*ctance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-hi.2c )si36mpo:o- mtir:u egmF capacitms-rhpi i)o g.it6::oeu3c m2or are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coimt6gd0 -q1xbh2j d h.ll, and 1.0-mF capacitor are connec hlbqd.htxm0jg-2 d6 1ted 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 connevq7 6,1 fvvpf)oq 5aqvlju;2kcted in series with a 20-mH inductor, what is the impv)2 v7v6l , pq5jaukqvof1;qfedance 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 connectedg:spb+m 1mh ai78 b1rc in series with a 20-mH inductor, what is the phase angl+p7rmmc81 hba 1b:igse 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 circuia. ; t1(aehw(slic ke9t with a 20-mH coil and 1.0-mF capacitor for a total impl9esa.t wke 1i(cah; (edance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed,wx( :dicb( sdz9/p yv in series with a 100-W resistor and 15-mH coil to get a total impvxzy ( scid/:dw ,9(pbedance 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 wu c)k 7lbbzlu1;/ n5rskot4g a.9n5 fhith a 450-mH inductor at 5000 Hz for a total impedance of 400005k 5lbf)basnc9ozu /l 17ukrg hn.t;4 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 w+ypzirq, p,oyitk;9 3ith a 100-kW resistor at 1.0-MHz for a totakpiz3pqiy9t;r,, + yol 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 conjekjg 7ge1wh; 1 r )rf2h1h8vrnected in series with a 20-mF capacitor. What is the impedance ah ;)hrf1w8 reje rvhj1kg721 gt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 103ylfubf /js9 n7 x8/yn1dih9b-mF capacitor at 1.0 kHz for a total impedance oly93xif j/bnn98 s/fhu1 byd7 f 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 i, l*56swhanm:uxb-srn series with a 10-mF capacitor at 1.0 kHz for a phase5r:w asx m*6nhbu-s, l angle 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 neededzm;rs c 9+qtwcddpr4m+ 4;p eetk*e)3 in series with a 30-W resistor at 1.0 kHz for a total i4* mtrp)e+rz+ qkt c 3ew9 m;p;cd4edsmpedance 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 7u -g zxa:yvtv4)ds e)capacitor at 120 Hz. What is the phase angleyxad z 4sgu):)v-tv7e?

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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/hw/ls sn:bh4e ul-k +rq1cf/i05njnz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se c/ubr wnhhknjq4+nle0f/si:-15s/ lries?

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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;egv *yqq169 qnigv y,-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60g nqyi;6v*qqe v,y1g9-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 Wdgp(;ih r s2qj s6 3)hgfdk,;f, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cur;h jd fq ;f(,3h 62psk)digsgrrent 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 orgdcn578xqh i(q5/.z g1gqzcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hzqn1. diqc xoh8 z/ (7gqz5rg5g power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle ord xil3nt-;yya3s*9f f -dfyrx y 3li3;*n a9ts$40^{\circ}$ 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 = t3wjugaz+ 8tzw lk :2 9+qapuo/f t0j120.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven int+39zjp k t8t2+:/ uluzwfj1aa o gqw0 order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output inwt4xpve t31-yzpz6 g3 an ac series circuit with 12.0 W resistance, 15.0 W inductyez3z6v 3w1t- 4gxpptive 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 cv.(q .;bpj6gum jo-ulircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance osd.rf4 dxq5wv / x+c/pf 30 W. What is the powfs d .x+c/ qvx4pd/5rwer 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 t:lla.g ok6f6c 1fti3 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply6tog ftic6a3l 1 .:flk?

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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 capacitor and a 15-mH coil in series?m+;ol 9dj.sn j+l snjojd9m.;

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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 serieojk0c1( s/gxoupfj(5 s with a 4.7-mF capacitor for a resonant frequency of 10 kH jo1uo0 gk(5pjsx(/ cfz?

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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 serie a 5k.voy +w)6nl9pz imz/wt3joy1k5a s with a 3.7-mH inductor for a resonant frequency of 1000 y /v)zl5yk 9nk1.tip 3ozj 5o+aamww6Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-mug7y 60tpvf3 W resistor and a 40-mH coil if the resonant frequencyvg60y mp 3fut7 of the circuit is to be 1000 Hz?

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