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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 magnet4q4vjn 5ra0.ev02 rnyijrv3 tic 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 the mvals 89(4; iicxw-i lv,fwk* $emf$ 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 producldr4wdy lrf hv86..s.es what kind of change on the iy.wd6dlf 8r s.v r4lh.nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a d:m7a -(8kceek 2sxjnloop of wire produces what ck8se- 2j :kmxd(a ne7kind of change 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 produces what kind of change on tf5rq7 xr9la6fhe induced 9alxfrq67rf5 $emf$, 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*vye 6.x; /p e0b kmvbnxtq-x3 a magnetic 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 directih) i5el+1 ibkk5r gr:2vv6evk on of an induced current in a conductor will be that which tends to preivb:1kg5k kl65h)rev+2irvoduce 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 qv ki+7n9g2tghorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationaryg7 t9vkqi n+g2 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 table/xiym cbnb*l n:u s8k11q(oh6. A bar magnet is held above its center with 1mubsb86/n locn1*y:(i kqhxits north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where o5a)w12hw:xe jdrb(j the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is tw abrxd(o:j)1hwj e5 2he 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 m 7- .zfqlji;jvq /42twy hgo+lagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the w4j+h glv;-iqo l7tj2fq./zy 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 in a region where the magnetic fieldojo-w dv1)sn,ikp. y) points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappe1owyi ).ok d p,jv-sn)ars?

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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 horizon* (gxa2j-pd wzvswy8 5tal table and carries an ever-increasing current northward. Two coils of wire lie flat on the d8v2p5z (-jawyw *xsg 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 mrtpcmx*be mo* ly.y9b u7*8: loop of wire with the north pole entering first. As the north pole enters the wib*8t:*.bc 7e mumlr *py 9myoxre, 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 whquv- r.yb ;9 6ixii0xpose direction can be varied. In a region where a uniforp6.i-ixx0v9 ib ;qurym 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 md*oe7uggpz 7o7e f3prp-5c 5o8u r h/axis whose direction can be varied. In a region where a uniform magnetic field points straightpeoz 7op*hg5ro r8g-3 fp u5ucde/ 77m 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. w 3,a(c g4j2qbrg7mvg
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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 that2;( uoxe fn:ce 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 magnetic8 ewjo0qzwdp*dg .t 83 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 north, -(kyvf:pj1j c zm/rvward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced,ycz p k(r1j-j:mf v/v 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 const dq,9+gsgiw :yant 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 trashb ::*rgrm:i0 )zqly nsforms

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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. l9.yt :y4 fmmrThe frequency of tfmml49:ryty .he $emf$ 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 d qz00i,yronsk 0.6yfdevice 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 tha-w8muye2 x 8:d:vuzunn-o9sc t

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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 primary coacw 50i. bt7eril then it isbri 0ace7w t5. 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 coilqz9pgg8c;y2(fu b*t/d 0qc sx contains more loops than the secondary coil then it is tq(xyc0 fq/g gcub*z2 ;9sdp8a

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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 4vu:omi+-lw3rp9d 3 yfe2uou 3esr8 j 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 resonantndm c1jar jygt13(a, )9 av-ve circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to6ipt9lz .pe-.-nzo gm an ideal battery of constant terminal voltage. At the moment contact is mad 9et l-pzpo.6mni- .gze with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal b6ewp-fuc99 2db hz9m -c fsg/lattery of constant terminal voltage. At the moment contacfz l-9ubwpfmc sg6 -929dhe c/t 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 resistance R is conndk+2 sk0yb av*7 8qcywected 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 connected to an dcut(dwobf/deo6*jmv:2 *ou mn-lm )ho2 -a:$emf$. 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 batte j6,eewvygru6raco *qdb *)-k ,d:nf/ry. The time constant for the :w e f6ga,n /o,b*6yrvuq*dcedjr)k- circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batteryvfh uvs4 (eacbx-9yynuwbg0;n2)b-) is suddenly removed from the circuit. The time constant for of the cireg-nbchnyu v u a9;b)yx42(wsf 0b)-vcuit 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 the xkp; dd8bq* 4qsame 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, the current7ap6nn gn q4e0

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the c emgkxkpwoexc.oq8- (-4f ch 8 ;/.cblurrent. ;cxcbkwo8 4eg8p-/k o.cmex(lfh-q

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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 when the freb7(*ta;q vircu ls1 )oquency is tripli(o7v*l) sqb u1tacr;ed?

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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 do , gczp8f6opd-ubled, the inductive reactan d8gcz6pop-, fce 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 nsoe+v d qna,p( -4kr*approaches zero, the inductive reactance ofa,rop(vdsnn4q* + -ek 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 conc; whut w,q l;b)bg7)vnected to an AC power supply. In this circuit, the currenth gw;b))wcvu7 q;blt,

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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 vr4 za7;3npg i,p0vkowhat factor when the freque7gn;vkizr, pp 0ao43vncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capa+ob*jyr 55bu zcitor approaches zero, the capacitive reactanc b5j *5zro+ybue 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 inductor and capacitor in an8 zf5;kljk40yma c22k q2be k RLC series ;0z4f knj52b a2 yqkmck8kl2e 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 c9dx0sjez4+xh4j n tt/ ircuit 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 circ3 1 kdnx9rib4i p*+keb o3fft.n,2a0 b nhfg4auit. The impedance of the circuit increases if R increases. When is this statement true?. i g fkpd,1x+3nb42n3 benrf iab0*a9f4o htk

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuits/ l2q.bgl q2.gg0axa2t dpq -. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circui)9q/mgtc +v 3owfi2a it 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 j/1rb1w0 /c o r,:8marra jfxhan LRC series circuit, the resonant frequency of that circuij8 /rch10 ,aab wr:jo r1mr/fxt will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven b ,-azq)a8fkshd.m7msy 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 ibvzd9n*cu62 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 radius 0.10 m is rotating in a unifhtzfi q3d7v -8orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect zt38q-i7f vdhor 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 rotatintov6. )for.y dj:l+/ii. tfn epg n*o0g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when ti g6l0jo. evipfordn+o.*tf:/) .tynhe plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatinj69yjlz/59 phf(a8 da3slspug 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 vec/p fsjahp 596l9y38d( ajuzls tor 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 red-njurmbf0 v2m6wi3 )m uced 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 j7 ,vt1opsv)hyc(o ,z $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turn(zwes n-sol- 48l .kugs of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the col8 ok4w nl-sseg-(.zu il. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 l;o81bzm tf:ohm1y* pturns 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 an2xa7c .5imvqxztkj:4d 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 where tt eys5l r018byph0bin /7xi- uhe downward component of the Earth's magnu5npbh0 7 y0yrtbl e8/-s1xiietic 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 angular lgxxs2x.03l.l -- jf*kc :8oej ffu oxg -+emyvelocity of 2.0 rad/s about a vertical axis through one o-e.+ -8j: .cm yk -f2o gxllx*o3ufsf g0xxljef its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectn(fy/hz nol-l+ hy)0oional 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 of ni2yv+ru e n*:9.sfgt area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cmt t+ p57s7xwwgqwfnae7y0 l** 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 aa70tpys5f7 extqww7g*w +n*lxis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arbf mxi23c a0 )hnt-j;xea $0.090 \; m^{2}$ 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 constr7ht*vmf)d0 f(0 w0fpva m4 fjeuct a simple 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 area of the rotating vd07mhf* p(4 m0)we0vftja ff 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 w:lwns4dy gxe82 2o )zyith 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 mm2r7:y5c82 kw,w5xv v 6pdnne*iabn hotor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto+ :(krs+ ;bzgs r2wnprr operates on 120 V AC, and when running at full speed it generates a backwrz+s(p2 k:g r+rnsb ; $emf$ 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 supply. Thw w4d6 n+djpty6t*lc04 kk-ble operating current is 1.0 A. Whatb d ltn4pd*wt4+-ckly0w6j6k 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 pobiimox p2 3/j,adsk0 5wer supply. The operating current is 1.0 2ijmx k, 5bdp3a0 sio/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- 3xmhvp:9e, grlwgb-6 V power supply. The operating current is 1.0 A at full speed. 3wglve-rb9:6hmg ,xpWhat 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 prima0obwq/ons08q/8-wt7tdy) xovz v 3 ir ry 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 s/2 l w-diut +ikq8m(zzecondary. How many turns are in thet mz-+2 kz/q(i8wildu 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 tu99wn406 husnqnn-mfi rns are necessary in a 110-V primary if the 24-V secfnis4n 96wnhmnu9-q0 ondary 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-turn primary coil and a 2000-turn seconutv: i 9gs2v6qdary coil. If the current in the se: 6s vtgv9iu2qcondary 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 th l8zokg--clo.yng e8 6e primary of a transformer. Assuming 100% efficiency, how many amp8.6 - olynlgc go8k-zes 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 si+ jhb4v;2nw67jxy7)long okm gn transformer provides 7500 V at 10.0 mA. The primary coil operates wg7 27 om)+n vbhxojlknj y;46on 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 e h4f (jnet7c9turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in tjc (ee 97h4fnthe 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 turns on ig ib38bc,m8kcts secondary coil. If 120 V at 2.0 A is applied to the primary, what curre,mcb3cb kg88i nt 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 gx8+nl:mt*nq f4e ;ptand its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary ne tx:+qm;* n4ftgp8lto 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 sr.k g (-6yxephas 100 turns and its secondary has 200 turns. If t-y6p x .skgre(he input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary a;sxzq3q8hc,wv5r kkwfy47 wz sz1.:has 200 turns. If the power input to the primary is 100 W, wws7,1q zh53ckww 8;fxy4z.rqa: vszke can expect the power 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 is usual52nko 5nsp+ t ((cskhnmo,9n uly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W2nn t(, nkocop(nm59k u 5+shs. 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 1v7:lg w6cj/ nmysq/4 u20 V. The voltage is usually stepped up to 4500 V by a transformer vmj lwy:u/n46 7 qsgc/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 ofayr4 i:uact/fd) j )r* current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and adr:tc)/ *a)ijfy4r utransmitted 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 lj/bwzx uk as c-ix/1h(-1 8m.fsgty. oine 50 km long has a total resistance of 0.60 W. A generator produces 100 V aa8u z-/m1-kxc fsygx bo 1.t.hij w/(st 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if 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 p; w/1 r5ytcz)ylz8y dhas 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 vol/t;1r)58d lyy pzwycztage 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 l:yyp ( 2yiwr3l0k-eh cine at 1000 V. How much less power would be lost if thec-heyky 2:w3ily r0(p power were transmitted at 3000 V 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 tranbx+-3jr9gndf smitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transform+gjn 9rbd-3fx er 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.1l5w5iq j br jkxzb3i0:10p( t i:jogd How much energy is stored in the coil's magneti0(i3jiqp zktxbbwd5g:: 01j5o1 rilj c 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 uv5z:pc ;v ts. u+c+pw18-H inductor. What is this circp;+ z.c: pswucu tvv5+uit'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 ACss2)l;tc rg-n circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?cth)0d .;2wkxn0j s:+6 ovdrjq9 tdap

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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 resistance obd 3s9bkktrm /+m.:wqf the lampk m3mw+9r.:k/d tbbsq?

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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. Whaei8 trzcbk-fn6z7 3 s1t is the peak current through the resf 7e-8intk3r6c z1zbs istor?

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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-Vo tjd(pl imq:u ob34,) ac power supply. What is the power dissipated in the resu4bt: j(3qop) dom ,liistor?

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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-W8(p:w lo 5gv)z bfw6 ,in,urbq resistor 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 5ag,q(k6, /rwookgez:qf-e,e0u mq ) p 0-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 /digg5+b izwj */ 9pcy50-W resistor 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 ax-m n y ;tm nl.9a;9o.d(x befhll9,oh 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50np/;mgqz0t zsix2zqza )*p * 6-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 coi ;l ph*lz- r2lb41fggil 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 at 1000 Hz bibe v;io x59e2ke)4j?

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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 h s:odu*2 okvrbt 25e+when 120 V AC at a frequency of 20 kHz is applied to it?r2 d+2u to5eob*vkh s:

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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 4 , j--2 z(w j,br;bev.wmzycroqas8h110-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 c5foj37zjgaj 2apacitor 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 cxqt cgql:i/q6u52p :g apacitive 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 wzvro e *guoa*n8 v.2*gt2cw)10-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)l0 e kcw5wh1d-mF capacitor be 100 W)5e0wl hwkc1d?

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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 0pc*qa t; cuklv6tti3 z302ko3 .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 seri d4s 6h4 y 13pcw4-tfc kjt9jqb2ohc6ies circuit with 12.0 W resistance, 15.0 W inductive reht9fhc32c w41jc6j 6bqtpy4do4 -i ksactance, 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 lz le,5s np4hc61ga;1ogbqp3at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connbnza 4elhq 3,gpc;g 615 losp1ected 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 y/sv ck jdof.px64-l0resistor, 20-mH coil, and 1.0-mF capacitorol60 kjp /sy.c4vf-dx 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 inductor, what.2qa)njq7,v j 4gsbun is the impedance at 1000 Hzu. gj)n ,2q7sjqnavb4 ?

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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 siup0h4+, z udaeries with a 20-mH inductor, what is the phase angle at 1+hp4z ui0dau, 000 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 ss n.1h*j0 ivvseries circuit with a 20-mH coil and 1.0-mF capacitor for a is*1vh0.n vsjtotal 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 needed in series with a 10 kfo06x pcb(u-0-W resistor and 15-mH cok6puxf- bc(0o il to get a total 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 must be put in series with a 450-mH inductor at 5000 Hz for tp7 z5:c-r 9hs1tq5nh wtb8bya total imp-:tcy8 bzhtnhr19p b 5sq5w7tedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.03 honk7ie6o (,*l xg5 tpps:ll-MHz for a total impedanhgi6o,3p(l *5kl pl oe:tsnx7 ce 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 iqb0f1v :zg,6 ejnz nqd.w, *sln series with a 20-mF capacitor. What is the impedance at 1000 Hj:gws* zn q1nelbzf ,.d 6v0,qz?

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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 capaciwx:1 + c+fxzn.sri4bbtor at 1.0 kHz for a total impedance oxiszwc+ 4b b1f n:r+.xf 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 needrwk-njrckc 60m,x.5udtm,. u ed in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofrx0.wck-jurkum56 t.,nd ,mc $40^{\circ}$?

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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 resistor at 1.0 kHz for a total,gq5b9c (m sttd1 4slg ,xww.6b; c*horlsbz 5 impsc sm o6g5w5*t,4 dlr,1b cl bqz(tsgxh9.w;bedance 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 ino4c0 z 9iv.fd 2evn.w4:j+uiyp w2x sd series with a 100-mF capacitor at 120 Hz. What is the phase angleej2 cd vwp9:yz.ixd 4 u4 +vnsof.02wi?

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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 a:qdzocsme5.w tdgwy6ja )2-1 nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coy6a:wd.-t5g 2) 1se zwojdcqm nnected 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 resistorzrl8idqwe zs ;+ 7*c(j, a 10.0-mF capacitor, and a 0.350-H inductor. The circj *wlz;(qd +7c8zirs euit is 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 an inductor r:m6)zcbby 4,rlbq)e4 g 1t bxod6q+bof inductive reactance 30 W are connected in series to a 110-V, 60-Hz powerr :dbq 4tz)qelb1oc6y gx b)6br,m4b+ 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 )y9-m qyr;kg r5v j2mbseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hbm9yj5r r yqk m2-;v)gz 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 :l w sx /l+ci)/d.vdduresistor for a phase angle oflld/ d c)/d wvsu+x.:i $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C =w 8,4l)zd pffj 10.0 mF. At what frequency should the circuit )4lf dzw8,pjf be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit witaig-z2zrb0 8kh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circui-gzizbk 2 80rat 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 ACzsb0afm2 c, oc(p/v/v circuit 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 of 30 ,, uurjkl*r0b W. What is the power0,ul r*ru bj,k 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 vjo/ghqi 5qqk;v/:m)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 sqvm5/i;hvg: q /o )qjkupply?

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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 cz3rl; -ot1 xjwq j2al/wsl u(5oil in series?l3x-ll5/z1w;j u a (oqt2wrjs

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fre s erdn7wvc4 l1g)v8p-quency of 10 ksplgw-nvcd)e r4v7 81Hz?

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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 ;+f/uh- ;slxa6- i.uzz ko haka 3.7-mH inductor for a resonant frequency of 100-ou - +.zk;/f;aiukhzl sa6hx0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W 6vft*p ) vrh/q ;tca)dresistor and a 40-mH coil if the rep/)qth da;t*6v rc vf)sonant frequency of the circuit is to be 1000 Hz?

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