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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 magnetic flux efyf n.n* 7(njlxcept

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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)hq.ign30 qs5u5 sc0uu:uhl l 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 z439)hv,. seabl ;nb4osk ip uloops of wire in a coil produces what kind of change on the inducedsv upz;l3 4iab 9so4,kbh) n.e $emf$, 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 strengthe. )fbzhc3r+z6dsl0:csyv e / -ehc7j of the magnetic field through a loop of wire produces what kind of change on the inzc3v: -6fl) sz yed.bhcc + 7s/re0jehduced $emf$, 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 changed0w30 . o2cairboo7zi on the induced 0d3i.ooo wbz2r7aic 0$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fieldvwnj1gks) 3*dsm:z 4m 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 a con.lx0f.q8)u:, jfvs/5 cz erfd;hh g ehductor will b);sfu fhhj.0g,c fevzl8/ e.xr :h dq5e that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is iqfmeg; 8k;* aheld above its ce*q; ig;me ak8fnter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on 8l0ssql h w)/oa horizontal 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 (when viewed from as/h l0oqsl 8)wbove)

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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 bt a55mf*2wfn magnetic field vector points straight up. The magnetic field vanishes suddenly. When vit na f5b2fwm*5ewed 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 0ry,eklrj(u xy2z 04itop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increasesx r0( iz24,0ylkuryje?

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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 tablei l.jmldk8t12 top in a region where the magnetic field points straight down. The magnetic f k m2d.1lt8jilield disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carz c9;gwy75yp cries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed gzp95c;yy c 7wfrom 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 enterin h kx;:o5vcr,lg first. As the north pole enters the wire, the induced current will vo ,:h 5r;xclkbe (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 a-uzn3 vgl63 put constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation un vg3l u3p-z6of 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 sp(vbo8eoy k.d n.qib/:ebe38feed about an axis whose direction can be varied. In vo b.eekof yei8./bqbd8 :n(3a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.f j:ix rt,-mt8
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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 tu 1(wslrj7ilsb zbqa :9l76s 0xf9o;phat 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 magnetich t;rlxyh)yv +s .ts aoetw292 ylu1(3 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 moved3)nj8sr:(ygct pvt(lb 5a 7kd northward at constant velocitdag5 ()( tnkbc s8:r7y3lj vtpy through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anguli0,.qguixx0/(cqx*id y06kcw s g e*u ar 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 7.96cujygs) 2pd wrbdtransforms

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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. Tn/80 0pxxmyzfhe frequency of tnf8z x0m yx0/phe $emf$ 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 devicec4q5as a087e h)fzxq x 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 devic4qs:pf6 i gtv6 p:dzx5e 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 seco6eab 52ukm+rze lw6p* ndary coil contains more loops than the primary coilr 6ezlpm2 k*+eu5wab6 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 sz .cfl 0uc14bm,ks 4tvecondary coisubczmcf4.t,04 k 1vll then 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 poov5jd m7 p z*teu. nwy-diq7-7wer 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 resona1ms+l 3 an-2bv*cxwv cnt 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 to an ideal batec),w eid-f9m tery of constant termina wdf,9e im)-cel 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 to an ideb w .wlnebp8su;-.78bi5ofe l al battery of constant terminal voltage. At the moment contact is made with the battery, the volt fplbl8bei 8sbuww.;5en7 .-oage 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 connected to alptvb/v ./) 6 dhlj l5m*pqo7en $emf$. 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 resistagmtelu3x yrl /l6w5s24xm4(snce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The y 4pwsgmz( ybtpc*9+uwjqh (8 0+ 6jqntime constant for the circuit represents jyqnwu4mzq6w 0s(8ph *jt pcb++ 9 (gythe 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 co d sye(q836uvxnnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for tqv( 3sy6e 8duxhe 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 samy73 4-j wdgswcrwze 42e 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 pow i,3vml bd0p0fer 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 conn1hyhmy r t1neka2 b1(+ected to an AC power supply. In this circuit, the current12nyt(kh may+b e 1h1r

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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 w*e7.jg7v 0ok ft5uigjhat factor when the frequenc i vggo.f*5u7e jk7j0ty is 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 qz(.he y)nl-r the AC voltage across an inductor is doubled, the inductive reactance of that ind n.r)hq-y( zeluctor

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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, tn85qzi)zm8s 6luu -to i idl:(he inductive reactanci(l:u8 iid)qmt - 586snozuzl e of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In tb;n; .lhatw 1x4 m/uoshis circuit, the curreh;tu4wl s ;ob.xn1 a/mnt

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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 frl w 8zbyi)3rg8equency is triple yil8)z3 wb8grd?

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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 capacitor approaches zero, the capak-g zw3b2ja/r citive reac- k3zja/ gwb2rtance 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 a x2;s3v (qieztl/ow4r RLC series circuitsr 24tv/ wx(o;zeqli3?

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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 define1ik 8t/j-oavg5mvz e,x x6xa;d as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if Rgn bc)/88w 6- logyknt increases. When is thl86tyobn8 c)/w-kg n gis 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 the circ7dy6peqqsizg4: +ph60j ot c fur,o4;uit 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 seriest742*hcv yf 8vr:en9f dh c;it circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the cav1. gv ae(8hiuzzh:mh 1fy s4*pacitance both double in an LRC series circuit, the resof1v1m 8h . *u yhaev:g4(izhsznant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. A pg )9reggd xw4kjq(ix 3s :bw::pw0f5t 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 9d-qzev +s9y mx ej6mda6q/6 rcircuit 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 uniform magg 44 df)qp.odgnetic field of 0.20 T. Find the magnetic flux through the loop )g dq4.ogdp4fwhen the plane of the loop 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 fielt5-i gxh-q/ wn beyzx*wng; v-st23 j ej5hc1,d of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magng-y,wnesh j v*-1ewb -/hgq35xcnt2x5jz it ;etic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielf3h(bl/l: p8lah7gb qd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arb(fqhg8 /hl a:b3 pll7e 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 adu v1l/x, 3zavjrbh )u1justable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fr izuv+5yh v :+sysswk.y-svk. do27.xom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sd m0xilw3v2fv*q9 v0 pides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifor*q9x2030diwv vml p vfmly 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 turns and t,v-um;ug0 mg 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 area lkiol- tq*, )y$0.20 \; m^{2}$ 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 horizoay+ u: :ugfib9cx:ad9ntally at a location where the +9ib:uy:x9a:cd f gaudownward 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 m nou).n yoq8iz if+ 6y:2fgdq8 long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a co:oyg.io nf)iq y6f88u2+z n qdnstant 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 a tdljs sg+- qx0mj9;8drea 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 turn0oes;a tqmpc- korb f;c+0w4/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 $emf$.

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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 lg -hqkg/ck3 78g.o6fwt+lv +,hx vpbioop is 12 cm long and 8 cm wide. The armature rotates ath g83kwpv cvfgxkto6b. ,lqgi/-7+ +h 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 os.e dcirw ek+ns6z1 o3.95vqbf 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 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 avv 7 j7ma,nb7n 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 areav,b 77amvj7nn of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genead1;xa;x tc 3v+u ;0uosa7dfjzwk ;n8rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ouzn 3a ypl7buke)68 /gf 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 * -j(mgw;byk l9qkdo ae /w:c2of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bac yodba9lke2gj cwk * (q/;w:-mk $emf$ 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 supptfcx k0+8po 5m.q() vrqhji(oly. The operating current is 1.0 A. x(mtvri)oh.j( 8f 5p+oq qck0 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-goj1; ,y*anv kV power supply. The operating currentny*gkjav;1 o , 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 connected to a 24-V power supply ,bl6gn9cuig6.w h d2c. The operating currenb, nd9 l6wc6h2cigg .ut 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 transformer is needed to rha +-p3bi+tx keduce 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 k9ohxg-z 0pmeph;h(0 primary of a transformer causes 14 A to flow in the secondary. Ho(-xmpe p;k0 zhg90ho hw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many tu4:dk 3djv 7gazh/ z:.y zhpjj*rns are necessary in a 110-V primary if the 24-V secondary hj*zg:jkpzv jd .dza/34 h h:y7as 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 secondh 2 s-5i+7*bk xlq3p8cxyxi)u(*w1gretzrc dary coil. If the current in the secondary is 3.0 A, what is the current in x5 r *c- xq1u7swic(rb)+ied glx3y2 h*p tz8kthe 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. a:vljg0c s;8- dazp6y Assuming 100% efficiency, how many amps at 24 jpz;l 8ad0:-c 6yags vV 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 tfkc .e2;jnb8vfk7)cq 7ja fr6ransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the ;f.bc) 8fn76jq7rjkv ekacf2 primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 3bms1 qp qzw32,00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sec2,1 swqz3pqm bondary?

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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 turns3ov)9uvkxuo8 vmf+kah4cs 1( on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondam kf18vh )v 3x (so+uvu9o4ckary?

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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 secejz(6. wsdr jc1* z3olondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondsjec 6r1w *zo.j(zd 3lary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I p qohi-di)a*pw/02 dkf the input voltage to the primary is 100 V, we can expect the output voltage of the sewp i q0do-*khdiap)2/ condary 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 a/) esm wy05kdww+ zgh9nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (ww5 +e/ zdskgw0h)9ym 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 curr+16 44axwes lsxx,uf cent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitte,asxuxwxe f6 l4+ sc14d through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu/c *yyem3a )k:dn wh8:wtn+qkally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance nt*cwwh:yqa k8d e/:k 3)yn+m 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 on)vxzq;) ug6-fvdzn30; d jsbf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmittg vz;fv0n jdxb us- 3)n6);zqded 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 lindb/6sbl (:/. jo;mfhdt yupx/e 50 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 the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What p ;.xl/thj/:ds f6 ub ob/(dpymercentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genergg.s;3n awi9)r8 kgb;iz5m d jq4pab*ator 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 wg8p4w.n3gdb5*ig );r q;a s ibma zkj9ith a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much i0j u6ri rj9cb96 fre9less power would be lost if the power wec0bujfj 96ri6ri r9e9re 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 20qggc c. (c/zi* nk+m.h A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if thcz n/+gmigq.(c h .*kce 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 axv,egl,x2fme 2ss3/ t as5tl2 current of 5.0 A. How much energy is stored in the coil's magne3l,txt / glm52 2sv2exaf, sestic 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-Wre+.g+ vt7 behmc/7 na resistor and an 18-H inductor. What is this circuit's time cons+.b e/7ngrvhm+ae7tctant?

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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 :/aes+nn/ hf qc xng07an 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. What is th,el 6*g zb zd5lp3u)wne 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. Wha8cfbgc)-rp0 n 3zh g3kt is the resistance of the lamp3n )c3cbhr-z8pgkf0 g ?

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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 supplq b *7d5so-/htkvucqeq7.se* y. What is the peak current through the resi us7q/s e7q.*cq* kdt5vob-eh stor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power disss4obu jw x0-t, /a-l.ojssi6cipated in the resistor?ts so -jac0lwu/jx o4.i-s,6 b

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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 resistor is u-hj( d iyj ,)r8wrz1x$I = 0.80 \sin (240 t)$. 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 50x8r(/yv4 axiw r 1lqve:igu-:-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 resistot.ywkh3b g,*/ d1zrh er 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 inductorhl;ha/ y4y-dhx 5 3.h xfkgz5w 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 2.50-mH kdbeynk3 *tpib82um-z m hpfn/f7;42 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 reactance?( ginbe p- /dba7xsp1)

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary7sj v 3:hh(jffli da*0 for 157 W 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 inducoc 1 jy7d0);zs ivxoh9h: d/fitor when 120 V AC at a frequency of 20 kHz is appl);cd:dxoh/ 0z yojisi71h 9vfied 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 d,4us+2x rrvoln57 uguva uw6 i:dm:- lue 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 10spegf9s.p - m5 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 neededm1 hs(e ti9f m/zog.)a to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 104t g0,bbh)fpf wtqr0/*ii fq0-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capayf-mhsje m xx6fi+81 1citor be 100 Wm 6e1j-fi+xfyxh1m8s?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.-gz6fluxy5 ze3 t2i.t0 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 6g.3t:5c wfe)jpgyg lan ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacygw.5lef:g tc 3) jgp6tance?

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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-Wd0n,rl q4eqt l/qo.; +m:ruqu resistor, 20-mH coil, and 1.0-mF capacit/olerum+qlq0 tqrn4 , dq;:u. or 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 10fq8c gz(8xti: 0-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte( g zct8qifx8:d 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 jw 73ut:jyr l8inductor, what is the impedance j7yt83lrj: wuat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in o wt( *r9x a)iie3j;orseries with a 20-mH inductor, what is the phase art)i9;( ioxje orwa 3*ngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa)fn pqf6azq m/c-1q hrt-eg.+ *q a*cwcitor f.* q1h/az*rqgpq6tnm wce-ff c) +-qaor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a(y e6hma unv522mhkx:u7 2 k)dwc0jqg 100-W resistor and 15-mH coil to get a total impedanx 56u wmg(ua:ky h)2dkcqm7022vhj ence 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 t7 s m 0mvd1ilj1unc 4a45n/nw450-mH inductor at 5000 Hz for a total impedance o1 da45v14t mmi/s 0 nluw7cnjnf 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 -xrql30yw g/:ji;vy fin series with a 100-kW resistor at 1.0-MHz for a totwl 3f:r yq-i;yjxg/0val impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is th3x 32 vr8ab6zi rix0xpe impedance at 10zv0r6 82r3bi pxaxi3x00 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 widw+, c*(kbj c nohxm*(th a 10-mF capacitor at 1.0 kHz for a total impedanckwbom+j*nc( hc* ( dx,e 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 c4bswez- d7ndfamg.8:+z+ t mrapacitor at 1.0 kHz for a phase agw bz:+ddr8mn + zsfa-4t7m.engle 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 *j7+vomdd zp8in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 z8d7*vm+djop 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 10mixx4ua i.ayvt3k 9nq+ 29l-s0-mF capacitor at 120 Hz. What is the phase angqlxikn u.3 + sxm y2t4i-a9a9vle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, avp( w4/oo 1v ptea5to1nd 1.0-mF capacitor are connectet1 voo5t4e1a wp( p/vod 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 a 0. b9 vwxo8o0hw;;m;uwk 350-H induo w9;h;;wwv8xukmb 0o ctor. 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, a5np0 n f8:ui0mcx gh:ldyi4w2 capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in 08hiul0xgn :d2p i f:c nmy5w4series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50x jhpe*q42*bwvu c 4c7e zi5o+v/ l3hz-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?c4zqc/2ve *xlhz3b7 5hi +wvjo4u e*p

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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 aeu7)j 6p :*b 6xk6)eqmp o7fvpnwpn9a phase angle op67n a) mve:q7p )u9eo6nbw 6xpfjkp *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 circuitu:ew f;yc8lc( has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum lfyc: ;(w 8uecpower 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 a f7vj2,3m5gn,q v0anqf b: yp o0cv2gxc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiv 507g a2qo:3gb02vp,jynq,mf xv nvf ce 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 at01fl rz(j0piln/; t in 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.l ifxc:iy orb1) :yd) 60 W and a resistance of 30 W. What is the fy cdx.r 1:yo:)iibl)power 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 ser jr0kyx o .m/g )m-9su/jgaz0 :bv:xqiies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induc-kvgs g/i:xaz x0jb:0 /uom)yr.mj9 qtor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant freque9 hlzy mvrfv ;i;c9z08ncy of a 1.0-mF capacitor and a 15-mH coil in series? 99z8 0vyvczfhir;;m l

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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 x. i d/2 uslzqa.s-l4v4.7-mF capacitor for a resonant frequency of 10 kHz?lvx/- 4zds.sla i.q 2u

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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.uf (gwyditjkuf +*g4zyi7;9- 7-mH inductor for a resonant frequency of 100-4w9f gguij7ufdzky*t iy (+;0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in serie 7ca)x ky9dhqrcsd08/1 nv0nks with a 30-W resistor and a 40-mH coil if the resonant frequency of 0a8k9 sdnhr ckqn0xy/c17)dvthe circuit is to be 1000 Hz?

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