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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 om: x htddul(,vh2z 2 bx*8ew4yf magnetic 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 states48l-vmjiyv)1 hc o1s n 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 offz.m gzvh.rjs*4 bq 63 loops of wire in a coil produces what kind of change on the indh.gsfz*4 q .3zrvm6bjuced $emf$, 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 r,hi vq85wgz297 e2p l/2pva e)hwtiu loop of wire produces what kind of change on th l7v)iqh 9vu 2he,w2w5gpap2/8i z etre 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 m h 4gu.u0le6wgoxu7 ni7m(ootb) 2ta :3t .mbwhat kind of change on the indu 2ot u u3i(omtgwo7 t l7n:.xb.u)a6m0b4emghced $emf$, 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;94ew 3t6ecqmhgoy+w from 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 dip9iq;d ax3+5j uxo-qwrection of an induced current in a conductor will be that which tends to projw+u-x oa9 x;3iq5qp dduce 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 magne3 tkl(di*aw3vy46fu ut is held above its center with its north pole pointing down.w4 33*vtuy id(l6u afk 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 a horizontal table.)f uzmo4 r mhnjsh.:x;(w:sx6 A bar magnet is held above its cefw6rmj nmushzxh4s .:)xo ; (:nter with its 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 in1egz 96nc.4 hllzrpr,h5lo-9xj r.h v a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed pzzl9l j. hhv6 hx.9n5- rreo,c1lg 4rfrom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a2iqxms *8ucpt+/2he k region where the magnetic field vector points straight up. The magnetic khu 2 *emiq+c8tp/sx 2field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tabla-z *c5 :b ekfafk-1vse top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above*1fcbkz sev af:5--k a, 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 liesptjp /g qi- 9)c-g-kkg on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, t ig/- qj9c)--kkppgg 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 wz;*fngxgla5 ;ruvc.t:7a3gq ire with the north pole entering first. As the north pole enter 7rfa u;;3.nv:gc gal *t5qzgxs 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 wihlmamis; ja *5c4 7g5,tjrj(y re is rotated at 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 of the cm ltj(7;ma5 ,g5 ja yjir4s*hloop'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 t ,hdz6iv;kw*x -mm hya:b 5d0axis whose direction can be varied. In a region d bm 6y:-zk,adhv 0mtix*;hw5where 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.git8fys *y74c
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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 t( jht/o7uee+b(hc: cwhat 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 field. The 1aehrbuief4rn r 1( m zjs05.5$emf$ 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 northward at c o(q)4 t;f5 yqzbw 2uef2s;e l3qyderf(bm4x9onstant velocity through a magnetic field that points straight down. Make a statement conf ;tb94)2q2( ees(f qxlw;byredq5z3 my u of4cerning 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 ancb4icueh ;:/ dgular 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 -k,i8l7syie qrms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rota/yp94 bm6 pkw2wvqe 1ptes through 60 revolutions each second. The frequency of tweb p2wv1p 4p6qm k9/yhe $emf$ 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 to)b gfo2.3 jm /2cwk3rpc m0qvx

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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 dewf8+/xzd ,st/,x ;vi g3eltcx vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thz2iu9 vbjx3dvd 38 u)can the primary coil then it i2 3v89bcvdu3uzx )id js 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 thv z5/*4;w hec /kqupwban the secondary coilu 5* zbwkvq/cwe;hp/4 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 power inp.. ono /q1ivg6 1(;fdngrbsfk) c-eio ut

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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 resonan+.:9ju pnjvw8n+ojl:zpr qa 7t 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 ayyd7d cy9+ xp+n ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resisyd+cy7x9+ yp dtor 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 battery u4m/ e5 kueck-a/ / rg,th;zizof constant terminal voltage. At the moment contact is made with the battery,a4h5czzk-tk;/m , /uure ie/g 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 inducta87-aalc yld +fnce 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 resist t4(5czwrs nuc87o2a mance 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. Thg myvuaxi;9 .lxy d*6(e time constant for the circuit represents the time required for the cur.6xdgla*m xvy(9 yu;irent 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 s, l;xx e/slb;s0 b:vfzl84 exaeries to a battery. The battery is suddenly removed from the circuit. The timl efl;x sxb;: zvl,xe0as /48be 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 followingtgvt9w +k7vrindk6dkl) /ryt7 29 cl+ 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 supply. On this circuit, the curr:kw56w6u3t fhri79xuyo2b e1s ;a dt uent

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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 o ru481ktkhzim d:2p2an AC power supply. In this circuit, the current 1mk 8d2 z:iku2roh4pt

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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 g (uy zjz(wqw 8jlj/hey().,y the frequency is tripled?) (y8g l(hzu/j z,j.wjey qyw(

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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, thv olu*.xbk* /8 m2puh* +qfndve inductive reactance of that induct qm8nf pv.uu2*od * xvk+l/h*bor

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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 approachk3 srvlb4)v+p es zero, the inductive reactance of4s)3v rvbplk+ 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 poitdd :+/ye qo(wer supply. In this circuit, the currento/e +:tqyddi (

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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 p kkazbgr89 raomgyi4dz 0rj97- /)z9the frequency is tri m-9ij9akrkgr49zopb7zg)yd z0a/r 8pled?

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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 apprjmz)6u9w, .n ijm68vkvukxq 6oaches zero, the capacitive reactancmku)jnuzjv .kimx6 86 q 9,w6ve 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 cx1g3ktnrg- 3 fapacitor in a RLC series ciknf-g1x 3g3r trcuit?

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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 d vw0raxq(q0 1befined 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/9pas5) n3zg0gf,y; w nfg gqk79lsu f if R increases. When is this statement true f39,)ufs/5sg gn9g p gz ya;n7wlfq0k?

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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. Thekrwk *h96w8y bbj6 ww.)yft)l 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 cik :hht8e 3xap*zrocqf4a1o 1*rcuit 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 Lhakq ;hij+:hp3cl ,xg j.90loRC series circuit, the resonant frequency og :h., lojqiha3x0l jcp9k ;+hf 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 A6uu g 1u)mr;6uq5avv oC 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 circuito0c8 6fn ka;ie) 4 zyitp87yvus2z.ry 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 itv+6f+,z 351sfudyucy (lf nh s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lov +(fu1usydy5tcz3fn ,6fh l+op and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field okfr2p7 6ajgrlqv8+) wf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pe2r 6+k7q vrpj8w) lagfrpendicular.

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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 rotatfk9w8brsv4. wk i.ea 7ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the looar4 s.7.e k8vwwi9 fkbp 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 adjus4-ey /tss,yfvtable 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 chanu lqz r87 v)9-ajb0vfwges 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 turns ow xoj0ii/fyx9x ,wxc2j/+2mchja72 yf wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field / 0x m+ j9xwjyhjiwi/2ay2oxc2 c,f7xchanges 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 turns and anb e(gqnn e5ta3fo5df+hkl2u8a y,2 s1 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 anz/z-w tcuk6mvxuy5m2y-*sz(k4qg2d bc o - ;md 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 flix,097h2 k8jvupvr-t rci 5runjq.+ q res horizontally at a location where the downward component of the Earth's magnetic fi huq08jrnv 2 cxv+q,7jrp riuk9r- .t5eld 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 angu2ecck 1c j dlfvc:x01ye5 9pg/lar velocity of 2.0 rad/s about a vertical axis through one of its ends while incy5ve1p0 /cjck cxe2: 9 ldg1f 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 vh i6goyyao rfq+:/3 7and a 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 turns of wku kg40jlj0w 5xdyvkb .p-,sn:y5u;gire 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 loop is 12 cmlv2k*3mjnly ht 9 gdm++gk;, l long and 8 cm wide. The armature rotates at 1200 rpm about a l lnj +3y9*tvd2lhkmk,g+m;g n 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 of 100 tiqk k+edqj.tk,q1(wz9s9 m / 2) dksvsurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outputnr1sdt cut- fl l lrs+w/:1,*v of 12 V maximum when rotated at 60 Hz. c t:+-r1sd *tvsl/1l,ruflnw A magnetic field of 0.050 T is available. If the area 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 generator with a 6z:qh xa ydfyb8w ;kw /2x)1;ipwztk7maximum $emf$ 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 of 6.00 W. The moto2jnm; dd a7u mbqfahf,o;p;r+wr .4v 9r 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 mog9t9l2e 3 udzizb,g+ gtor have a resistance of 6.00 W. The motor operates on 120 V AC, and when run e+zgg d32z,gl ib99tuning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. T./ , z)tu ubm4flnzqj.he )qbz.zut.4flnm, u j/ operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is 3z909 vcz02v wb6xcoy a rbvm2r74azwconnected to a 24-V power supply. The operating current is 1.0 Abw42c roz3x cvzry62v 9v00 z 9awm7ba 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 re: fu2pdodrdf m c8(7b;sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What pcrb d(u;mf7 2f dd8o: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 -a55 e1jxlgpn;e dq idr/b(5p 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 tra nfn4m ku,+i(ynsformer causes 14 A to flow in the secondary. How many turns are n+u(mi 4 ,nykfin the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V 5z o f,jq1byj3secondar jo3b5j ,yf1qzy 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 of0 kueh n8 g;dko5n/m6z9udws1 a 500-turn primary coil and a 2000-turn secondary coil. If the current in the sec 8/9mu1whdd6;g0kz ok n5enusondary 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 100q;y9*l1 5lcj .lt rf;g wtmpu mv,- dja,vwk+(% efficiency, how many amps at 24 V can flow ;l1.w9f vc-d,j+5 t*wa(urpljy;,m kl gtqv min 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 neen5tt*+tp ubv +, ho(mon sign transformer provides 7500 V at 10.0 mA. The primary cuphtn +m(vbtoe,*+t 5 oil operates 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 primary coil and 3m)dwoo/npk41 a/pb 0 l00 turns on its secondary coil.d la4n/ )ow0bm /ok1pp If 120 V at 2.0 A is applied to the primary, what voltage is 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 t)8t8y.r t gvwm04xkn coil and 300 turns on its secondary ckgytr 4m.0xnv )tw t88oil. 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 turn c6bcy9 5w-gcns and its secondary has 200 turns. If the input curre9c-bn6 cgcyw5nt at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20/pj;hagp 2+ po0 turns. If the input voltage to the primary is 100 a pgohp;2+/ pjV, 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 has 205): n5 hqwimte0 turns. If the power input to the primary is 100 W, m)5tew :q5nih we 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 usually steppelr6 ke1e*ikg1yxl0p bfr-z.6qd / /w zd up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turnsxlk gpr*0q/6b1e 1r.zy-kdew6 i f lz/ 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 oi ) usy,1dr86 *7qs cotbe;obzf current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and o76 t1 ;,z8rycubis q)*debostransmitted 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 60xc qn;1:-w j/k:jdhbk A 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 transmission line if the voltage is not stepped up.k; d b::1nxkwhcjj/-q

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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 qk5si9gj)f:2ma:x.wnb s)u ;c:obcskhx::u a total resistance of 0.60 W. A generator produces 12:.5gfx::ac o)nmhqb9bxssk):; iu : ckwsuj00 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be 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 genq4 x 0 6gh4xiwkgsw(m8erag6w0(mi xgxqk4w s 4h8tor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 100 5c. rhtdkjidi,82 t9s uxdgu6ebk3 ,80 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100uxc, 8., t2diku i95h6djk3gedb s8rt 0 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 Ai8ftc: v( kl -n1h (q9plbzk/kdg(h7 b. 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 thzk k 9(1bf7 hdvl n(qtlg/kb(phic8 :-e 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. How much eu:cq7+t x:z h/c3sw uinergy is stored in the coil's magnetic s xh3wz:u/:qcti+ c7 ufield?

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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 containst -q:ttjlqpn,0y:6 nu a 6.0-W resistor and an 18-H inductor. What is thisljt nt p::tu,60 q-qyn circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cg8 rixcg rqpo2l4-75tnskf) * ircuit 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 outlec6+qvuw7+c2 v*d x qqjt. 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 ,5 lvelx4ls5pay d 7+foutlet. What is the resistance of the lamyfesd+ alvl4 pl x755,p?

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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 isj/z f+q9e3u6+ipy b qq the peak current through the resistor?qqq/jbf+ 3i6zu+ye9p

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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 powen q4r zh)2o:nig(+gr sr dissipated in the resistor)nins z 4g2o: h+rrqg(?

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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 rp o1tyom / *2cx 6l1pw5ok3ljhesistor 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 0d1e eopvqb /,3)x xcua 50-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 nry.tqjc56bf, d( kr */ :irnra 50-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 i weem7 zfr8t:s hh+4 cffvq0y89q9y-.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 2.50-mH co2r zjv5l+ gt fy*95tgoil 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 wiv0tl8.4, bwx/j4g xydttjc4b ll a 14.0-mH 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 ,mf5 e; ;c 5.nd7cgyaeox3r i t*swnm2W 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 l;n.qfpft+6i *ga om 7a frequency of 20 kHz is applie*a pi+n6lgoq mff7;t.d to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to: b. ffct 7/ gzl+ivmx.z)8uto 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 ..b7,k8b1ivw u, ahsfpha ii2a 4.7-mF capacitor 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 Wlp; bercoxn1 dl45q/, 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 10-mF capacitor have a reactance oed7 p 9nni96 vqlw ys/le0m+t2f 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 wil40vq7r/ g i;ftqqp+xtl the capacitive reactance of a 0.010-mF capacitor be 100 W?grtqi;f/740q qvx +pt

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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 thlzclt*4armc 5 m mn5ng79 t tlajl3,-/rough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an cmz4 xq)jc*-q ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W czqxcm*qcj 4 -)apacitive 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 impet(pl yi6yuv/7dance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s u p/v7t(yi6lyeries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-m:2i tr2*m izb whi0ic0H coil, and 1.0-mF capacitor are connected in seriesw2mh*z r biiii:t0c02 ?

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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 cond*f ne hl+ja*hlcu,6mg vn37(nected in series with a 20-mH inductor, what is the impedance at lh *g7n(6eaj, h u*+dcl3mf nv1000 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 series with a 20-mH inductor, whth: rxn friw b ksmnpx(;*a+os,+e1)2vj/l z2at is the phase w2;+ip:jvl2xzrrns) /h fx anotse*1+ (kb m,angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.x. 1akbiyg z6.0-mF capacitor for a total impedance of 100 W at 150 bzik1x.yga.6 0 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 capacitanciu,m: )36 soq.p f znh8nwci2hes is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hs 3 hnm w.oihup2ic6,8q f):nzz?

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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 syo ts1kvzc+z1p 083 aoeries with a 450-mH inductor at 5000 Hz for a total impedance of 40000ca+pztoko11yv0 s 3z8 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 qzum k4u1ka0 ch 2.948irizrt80fkbkat 1.0-MHz for a total impedance of 150f9 ku rk.8c th02zi q844zurb0k1i amk 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 co6f4 drp(fab lcs eanuwg 87a9*s.0*n lnnected in series with a 20-mF capacitor. What is the impedanceabf a cdw0n(*s s.p n7e9r84fllgua*6 at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at*wzi2(g0.t q6gkn7c hz naz ;v 1.0 kHz for a totaz c0hz 7*w2knqz( v;g.gi nat6l impedance 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 capacitor at 1.0 kHz for a phas-l;pc7 :iaa6z 8w2f;hxjgwywe angle op6 gwxf; wl8c;y7az-hiajw: 2f $40^{\circ}$?

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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 d ;q+c.t :oziftotal imped.+ tf:q zd;icoance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 H1etr1g)idp6s ri+xz4z. What is the phase ang1eizsi6prx+41 t)d rgle?

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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, ah5je+aatlk9d 2poq (;nd 1.0-mF capacitor are9 a aqkteo(jdh+pl52; 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 consis6f*d- j) b ouf+8py5 xrghjbf+ts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a jdrfu-p)h* xbfy o+j +f5 68bg120-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 cou-2-pc( dh8u0 ne5jvcoy xip4-e 6l x cmw42capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110cd40xmv 5 o2 l6u-e-4(wche cn8-p2jpui ycox-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 52,5ry a*m bkmu0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected a,2urb *5mk ymto 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 necessary in series with a 500-W rsr8om: x4s: a(dmv4d zesistor for a phase angle ofm:d d vrssz:ao8xm4(4 $40^{\circ}$ 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 = 10.0 *fh 9kmh5xo o w.)yu/xmF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving s/ kyo.uo9 w)*xm 5hhfxource?

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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 aj-f4h( hmyvs 8(l -qa;kf yp(ye e6-swith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react-;pjkhv8 sayyff-6 (qeh ms(ae (l-4y ance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circucnm)nz7-mislz3 l e2- .d9mtait 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 impedancsu1au 3n f8nc/9 muml/e of 60 W and a resistance of 30 W. What is the power factln 9/1s3 mf n/umuc8auor?

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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 sayx ;dox7/.;o;j jkq stf42 wferies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power so.;fqx jy kwoxt/f;72;a4j sdupply?

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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 15t9 jhvs4h 9,5 0 9rrohaelaml*-mH coil in series?4llh hmvh90a,jso a r995re*t

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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 capacito4ghh-aa p*i(a r for a resonant frequency of 10 kH h-4a*aha pg(iz?

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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 inpo cb4v:r ,iq a6c:1xkductor for a resonant frequency of ci obc x,p:1qrk46: av1000 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 3j cmi9 4fam6 /6cvhreb9 7o7mx0-W resistor and a 40-mH coil if the resonant freqa97 7 4mcvxi6mje6hcm ro/9bfuency of the circuit is to be 1000 Hz?

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