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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 magnesvts kf9 gh cxp35,nnzo+6mj o(b*u +6tic 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 stat *ismqq( ey39 tz,xuc8es 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 producesizzevt 4a,o7ino s +(76hc1vq what kind of change on the induc,vv t6e1 z(o sn4o hizca7qi+7ed $emf$, 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 om; 8xm fab6z3zf the magnetic field through a loop of wire produces what kind of8bf6a mmzx3;z 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 o3)l irl zc6jl8f wire produces what kind of change on the induic)l zl 8jl36rced $emf$, 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 m h;j5mubop a vy+ya7/ltk3,:a agnetic 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 5(z ).bdbxuhulaw, the direction of an induced current in a conductor will be that whicubzd 5.)ub(h xh 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 ismc8hivn;hi 9zq*vwk 3;s71dt held above its center with its north pole pointing down. The stationary magnet *hwvh iz qn; 1svc9m3tk78i;dinduces (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 h 8i-cj1 dif(ar.x+ hsf:x5ko on a horizontal table. A bar magnet is held above its center with its north poi oih- h f5rc+s(:k1j.fxdx 8ale 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 to ,s1 4ny:4yqy qiy-mwnp in a region where the magnetic field vector points straight up. The magnetic f:n1 i mq4sy 4,nwyyyq-ield 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 vq6hqc 3i2; sj zdpn32in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction o nd;h c3q3jv22pi zs6qf 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 re4f u.yimcuo4)-h :y. a2pzmizgion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewyh-42ay fi:pz. )u ucimzo4.med 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 an )6kjxyxeu( -9g5es4vk f pm+yd carries an ever-increasing current north)kxmykf+v- ex9(s j5 ep6uyg4ward. Two coils of wire lie 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 )xi0*xe 3iz a+yfu by2wire with the north pole entering first. As the north pole eu3zf abyi0 +)2eix *xynters 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 s(:/(q2wgqn ic+ ecjkypeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien:e kg2 q iynj(/(+cqcwtation 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 a5eqgb- 5sikc/h;i*u p2 xy )sibout an axis whose direction can be varied. In a region where a u-5s /qk 5i hiebiu*c2yg;ps)x niform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.x; y*ejpdvqm5l x6- 8a9kyl3q
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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 a72b7t rjaj)w rsbi2,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;cmfl bovyyvm;w.2 ;+ 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 izi 4fbc)(piq9p 4 kyn.n the east-west direction) is moved northward at constant velocity througypb (pif9zk4 q4)i.nc h a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rot;*mtg;h4 pu6hg crf-yates at a constant 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 transfo-r8i 0rciy ap vw) rvrm//a8b0rms

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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 revolutif6s2+y/+vq i maxlc*n ons each second. The frequency of the6 vl*fqiysxmc+a/ n+ 2 $emf$ 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 used ta3 f*d 0a;bqww-n)gy mo

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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 thats4 0mqegw)b mj9xxh5h5x1 jb7

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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 second a:e-).qc rauuary coil contains more loops than the primary coil thear.quuae: c-)n 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 tharr 5c.dm 76qsqn the secondary coil r67 q5csqmr.dthen 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 i7r ;ro0u9uujwh-- hq n g:jgu-(4ombtnput

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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 6e20uu k, ekx:lsv1a0u1:unjr-slar 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 togf*y h.w8izj,+ 3hhxt an ideal battery of constant term hy*+x f,83jtiw.h ghzinal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series nt)+o3 bq d c3i-c)x4fur .hqvh// kylto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indu3 /l hihvrx .qq-ok/n4cdfbty)+ )u3cctor 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 iq*-6yhw (4t ;jmaemslnductance 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 con e1.:mi w0:rze hsmlb4g+dcw:(pe qj4nected 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. Twl agiyhmnxvd2 d6y5 (16x qz00 b24ywhe time constant for the circuit represents the time requ wgdy 5x0ba(d6v iz46 2y2lmy qnw0hx1ired 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 battery isxqs56wn5, 3wwd n iz)os(vth; suddenly removed from the ci),(xdqw5s5ts6hv3n wnw z io;rcuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following(qmcma0r; cd4fw :nf2 have the 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 an AC power suq++ sft-4 ynsqpply. 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. In this circuit,.lykcu5h 7)wzop 1 gn6 the currentl7)puwy k15 .hgonc6z

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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 /b5*mnzf vq h zxt;9 su0kr6+nan ac circuit changes by what factor when the frequency iss5q bhfn9/tmz 0z;xv unr+*6k tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductitk r+.roupd:((a kcd1dq: tpad2,eq* ve reactancd:(u 1*dpk a(apk ctoq2e:dtr,+.dqre 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 ap w n)v8r;kn9 uerno* lfs-r9.)ztd8uoproaches zero, the inductive reactance of that co))-n w;.d k 9nv olo9uztnr*8ser fr8uil

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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 thisf f bqh,5 v+yq;kve(,h circuit, the currentkf bv;qhe fv ,yh,5(q+

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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 the 6 7efvw+mcus s5xmz7a,cl:f. frequency is tripled?zsu c,mf7l:5afxv.mec6s7 w+

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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 vol;;cr /-pxjh q83c ywsltage across a capacitor approaches zero, the capacitive reactanw;- s h q3p/y8lcxcr;jce 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 o1-v j2goc8 ; jet4a9i8e xlmuand capacitor in a RLC ser8xoojicj81-9tu e4;lvam e 2gies 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 as 4;ml w. /gl/x zz9mvq2i4oxr l$\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increas7jm( ornmhx- s23j 2dnz.7 liwes. Whel n2ow j7-3.x m2 sjr7zmhi(dnn is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The r1 5xt sdfvc srz gnp*3j3k70)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 ofa gj,id/h1+4a bhdd/tf tg6f7 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)pww 9oi++ btp LRC series circuit, the rt+p9w+ wb ip)oesonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is 60.jdz+aoj:uv3763 wxiqcr 8a cwd7.s zhbq kdriven 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 o: j5gwn9q(iwde,u; kkccurs 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 uniform magnetic fieldq 0tdvalrbkz765x,- y of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector alaxr q0y-z ,b57d t6vkre 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 ma+(:az-hb-9ixw bp0qge m5a gjs0bd;a gnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the meg g pm;s h:x-00bjiza+ b(qaa9-wb d5agnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating ffqug) p 9)id m ep.l.s(xxb)6in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when txl. u.6mbf9)exdifgp))q( ps he plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single looffn5 -; )m e f0vh:jpbwen, o99ink1aip 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 changtb6wnvv *pg0 oo (k66xes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 yrcs7a ch+-j)turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of ac-r+sjy h c7)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 wirdv3.q1oieq ncu7vp r1b 3vbh t: f5d*5e with 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 and kq 4c8;/rorlo 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 horizontall91d r2-cd2vse j;etcqy at a location where the downw2dqec; -29r jd csvet1ard component 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 65 e8yyhwydd8i)x* ctm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thr)e *ywdi t hxcyd6858yough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a:d 7dsx f2 -lkp0kv +gik9,hya cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 t 1tqzmk 29e*yturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each k0 gi wc8nqj.rz)6ok* loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magneq)wg0jkk zr 8 .oc*ni6tic 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 turnsrh 8pi3g)w; wi 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 consx)m* igkwp 1b.truct 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 copgi.bwx *km)1il 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 maximun ilke71zi2;em $emf$ 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 motorex*i x dqm*cg7 8g(yz, 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 moxw-fb z/vr6f+tor operates on 120 V AC, and when running at full speed it generates a baffwbz6 vx +/r-ck $emf$ 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 too.a7rcfm2gy1;4gui 2ybr me +9xr jvo9 1r- uv a 24-V power supply. The operating current is 1.0 A. What is the start-up curoc9 y-9r1ygva.rv2ie uf7u+j;14x rrmbg2o mrent?

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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 resmm(x)c/ah*nt * : felhistance 6.0 W is connected to a 24-V power supply. The operating currentma*n (mechfx *h:l/t) is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conn)ve z)d /bqoc6/bmoe(ected to a 24-V power supply. Th (bom 6ve )ezc/dqb/)oe operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformek09 qetrg-6 qtr is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer cauwv f.i6jv*s: tses 14 A to flow in the secondary. How many turns are in the se6s :j.w *fvitvcondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V p/;ok vnrom*a qz .l3saum*04primary if the 24-V second0o ;urvp.mk a3*smqo4l zan/*ary 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 wo)a2 wkpw:9 ba 2000-turn secondary coil. If the current in the secbwa:9kow) 2w pondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% eff y) (5icp4 ldp dbevnw*3u- rfw89mr,diciency, how many amps at 24 V can flow in the secd dv 3) 5blnw9cm( pf,4wupye*-r8irdondary?

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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 ner/uxn gig*s *,1mhz u-on sign transformer provides 7500 V at 10.0 mA. The primary coil , *g* 1hr/nigumsz u-xoperates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prim,xo.c-/qumh xa i6sk1 ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage imxk 1oh xcs6a -i,.qu/s present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on iit2ezab .2 g iq4x/p1kts secondary coilxb24it 2z. /ke qgpai1. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20s )eryug 1m4)v:.gawy 0 turns. If the input current at the primargur) vmea ).:ysg4y1 wy 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 /g7+knvr y r:(m ag9hvhas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect hv7+knvg(agr:y /m 9rthe 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 tur7 dky fhhw+kou1gm 7;l8vc p,7ns. If the power input to the primary is 100 W, we can expect the power fumw+ lvok7g7 7ych8k hpd,1;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 aule ;pg9zinp +8o4 3s+dj.*gka) salat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. l. 8ans* ;sl3ji +9p agp d4a+kogze)u 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 a u.5zgi1b p6rft 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t65 f1rgub.pz iotal 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 f a.2eai61b bybz4my8il(a )u of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmisiz14lbb6my .)ui2f(yaa 8eabsion 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 genc0)0g a uhelxzvc :8j- dqn c4o/*ij-qerator 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 ra gcc/dvzxjq-0e c-o8a* q j:in0ulh4)tio 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 s +tt9sl,+ofq km long 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 sl+t q+,of 9stthe transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down ba1h 3 nbs6fhf+m y9x4a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V inby3 nhfm h x914+fsab6stead 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 transmitted on a lx7osrmo.gtqh 67r/xy+6xw rnzbr. 8-ine with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss qsmow-.r xt b86 xrh77ynx/go+rrz6 .in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How mz/n 2i+dseg 6puch energy is stored in the coil's magneticiz +sgd2en6p / 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 inductor. What is thin8)na/afy8p p4*n a tgs circuit's tipt*)a n/nfpy a884ang me 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 ntx4+8-uc dtf28bxq k an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet.g wi0 z+ovaq- p 74nho zu:mcs7s9q:f: 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 ism vgya*j)2k,j the resistance of the lamp?a2kj)g v y*m,j

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak curr 6;( l-sar esl2p9 tpuhc9w8ngent through th8p29nu(rse s-ap9lwg t 6c;lhe 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 connecte)s .gd wanjv)rdx5s33 2db *q.n hwd8jd to a 120-V ac power supply. What is the power dissipated in the rd x)brq*n2.d8 hww 5g3jv3j da) nd.ssesistor?

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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 +o dz *onpx.,li2 n4fmresistor 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 re 7k0khawftb)3 sistor 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 50xu. .ek5n2 w q/cyx bprd1m+/f .a*hki-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 a 1.0-mH inductor/liv0m an d)6b 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 2.5fy.m,hrf q) quzvx8k8(y8io) 0-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 y(dwz d,rz0b .3vma1w coil 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,e s7sj:s9 /qg1c srhq/ /xohu 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 kHo s keto1z-;o6z is appli oko16;-to ezsed 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 th8koykr95j2 qji+ qf w;rough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 1qkr(qc*x; -:dig2fbd 85t jrs0 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 of6xr oip608 mst capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does e;x/bvd7 n*a 4-o-tk,x yy6ti5xsv soa 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 nwwl-+)v*x pi 0.010-mF capacitor be 100 W?)l- i n*wxwvp+

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitm0x+cr7 s, ehvor 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 auu m fv5o7rl*st9s:g5e-m1ouc series circuit with 12.0 W resistance, 15.0 W inductive reactan*1sem5:ouufv u g79 o5t-rlm sce, 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 impedanceyibnqus9j4*,0kka h( at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c *nk,0uq( i9js kyba4honnected 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 if9sln q nj4vuknom( ..0 a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie0u nmjks vnn4. oq.(l9s?

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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 islgp s1f zwr--c2 lgs): connected in series with a 20-mH inductor, what is the impedance at 1000l1w )gplszc -f-sr2 :g 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 covm tx)x- fz3k0nnected in series with a 20-mH inductor, what is the phase angle at 10km)3zf v-tx x000 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 hay5nm(cho+9x* u /z pwith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1uxah 5pc+9oz/*( hynm 500 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 100-Wj 9 )y*vgzjzb3s;, u9a- btqsp resistor and 15-mH coil to get99 )3 tbjqsz; yg-asubjv* ,zp 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 9i;jy kwftlmmk y*41 o jq1btk(c1q20450-mH inductor at 5000 Hz for a total impedance o *mq ojjq bwikf02k 1m(9tlc4y;1 1kytf 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 resk3rs x9qb3u w5nr j:* ly+ c)hd)ebow0istor at 1.0-MHz for a total impedance of 150 ):yjwr5c0+so3 bhdu9x eqb3 lnrk )w*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 xw ,l0a/e9d tuin series with a 20-mF capacitor. What is the impedance at 100u9edlt/, wx0a 0 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 nee6g w vq(o92y30c nzu 9ju.glvvded in series with a 10-mF capacitor at 1.0 kHz for a total impe9yu0v jvvq(lgw9 o u.gc 6z3n2dance 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 capac:fus69c8f geg. o9qzo itor at 1.0 kHz for a phase ans. 9o8:e u zogfq9g6cfgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a r12g0ojoj*i h30-W resistor at 1.0 kHz for a total impedjo1rig oh j2*0ance 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 jj04ut13t nyc at 120 Hz. What is the phase angle?jy j 0tc314tnu

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows arffa-6z*r 8p ,nzu 7fbt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitz*anrbfu- z86rf f,p7or 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, and -9qrv/a2qq s:pi 9fzyo t f8u2a 0.350-H inductovqa i-/2u9tf: qqyspf289o rz r. The circuit 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, an oa8hw0tp;gry1lo r -0 3avg5fd an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?;tl0o-g1gr0 a oafy8r w3p5hv

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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 l+jir- 13v ofwv-a y2econtaining a 50-W resistor, a 10-mFjvfy+2a3il1rw -e-o v capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n.-c1s oal 1ywjecessary in series with a 500-W resistor for a phase angle o s -ya1cwj1lo.f $40^{\circ}$ 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 d)ct9k dm yli*4fw()(gsud n)= 200-mH, C = 10.0 mF. At what frequency should the circuit be drived9m)ntd 4ui ky(*f d))lw (gscn 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 5nbqa-zqh6nf: xh)6z circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance,zb -n6h:q6z f5 )xqahn 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 af 7tkp/bg64c en AC 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 W. Why:z,db 6epkig*kxpag3w 5 h, .x tm3n-at is the wze,-x *3:h 3 pp6daxn.i yb 5ktmkg,gpower 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 conl xboay731 f:0kw*d wktaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec0wl7w kkx*3 1 bofda:yted to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1bt8gij 6w p6( 0msm*en.0-mF capacitor and a 15-mH coil in series?e ib 6wm6n8*tsmp(g 0j

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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 capacitj kq6htmn lnu07 +49o4x5ysj vor for a resonant frequency of 10 kHz?t5y4 +9lvmqju0s n46nxjhk7o

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fofxa::q4;wi+iei (( gr , kmcurequencyixw o+(,fm(iaq:g: e;i r4uck of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor ai yz;jquc-n56n x5go)nd a 40-mH coil if the resonant frequency of the circuit is to zx5jq56 c o ng-yni);ube 1000 Hz?

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