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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 unit eiu.,.kfk gj8zro;/ws of 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 states that the.fs9v pxat r.p *0*juftb/rh 9 $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind off c.etful88 wkyd9rk+g-tm95 change on the infymu+9e.kr8klfc 98gd wt -5t duced $emf$, 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 magf; n3/zuc vo(i/c5a wknetic field through a loop of wire produces what i3/uccz/f;n(k5w v oa kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chanfo an,e(*ptue7+ srx,ge on the inducee7+ern(txs ,*fo uap, d $emf$, 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 frofq4tqt6 / ye,xm 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 direction of an (jn ,tbzz tv5g7n07 ji ;msd*finduced current in a conductor will be that which t7d t *izt,7gfs50m b;z(jnnjv ends 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 magnetv(c vsm27h7z u5 mv3 zds0tym3 is held above its center with its north pole pointing down. The stationary magu z7yshs32t0m v5mc dm3(v v7znet 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. A bar magnet qw 92 wj4x9wkqo3;uz iis held above its center with its north pole pok;qoq3w2i9jwxu9 4wz inting 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 ta)5l:n: f lm xpkz-trb7ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenl xl::)m5krfl-bn t7zp y. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fieldm(f4; wjs7 x9vp oiwu3 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 increauxo(w ;p4f7 w93msi jvses?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic w+flu50b p ,mjfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as t ulf+b wm,0pj5he 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 carries an ever-incre-hv57 1jt jl.ldd s.v+6jmvo yasing current northward. Two coils of wire lie fla d1y vv .lt57ljhd +oj.-sjv6mt 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 wire with the north pole entering first. Alplyn15j 8 4/bipwxa ;5f6ceks t4c1iab 5wkepnf/jllx p 56;8yhe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular m9a kq72o27y r0e/,utwkrkkkspeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced mkuew 9kt7,rk0 k2yqor 2a7k/$emf$ 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 5x /9r tb3onrj *lg(ehspeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the o95j /3lne* xt rbg(hrinduced $emf$ 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.,--ccfe8)5/neqx vn oflvf ds3t8 cw2
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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 v,-vo mee3 62t/k bqrtthat 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 ms j+pa aql:+jju+.ae8agnetic 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 th3m61bfm w85bpu ;6xv /dbyukwe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acro y3bf d/p5uw1 wbmk8mv xb6u6;ss 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 angulart4qlc(dkb er wkw:3;hr o)9j4 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 s7g(zp-t : gbn.5jamcy r 0ub6transforms

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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 x9v6o uea+h4h nvum6f6z36q4l o)h b c9ue2ao through 60 revolutions each second. The frequency of the6cq4962 mnu3) 4u9x6hv hva6uohbe oe f+oalz $emf$ 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 uf r:prm. q.;1-oq4hvuqb0cxj sed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th4y;y)s y8-zj +sxq;)xtjjlo bat

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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 mors*xen5lp8p 5l7s rj w)e loops than the primary coil then it 5n *jpp x)rslel8w57sis 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 than8hhmh ri ,z.j9 the secondary coil then itih hj8 .zmh,9r 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 poj ye 1lte6;ehajbxl66 ,+hk 0awer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,rp +v;mo y;w3g

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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 sed/rexcm z q. *xgqn/ru2c2*n oy74klmf-5qt;ries to an ideal battery of constant terminal voltage. At the moment contact is made with 4./ r 5c -n*7mk /fxqu yx;gmlz2ocenqq*2tdrthe 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 connec 2rb7 a;4yqcogwpd5 ,oted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batter4 ab rodpc7; g,5wqy2oy, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L ac)97 vr(vm zui4l: 5e(gwbozhnd 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 connected to ags9g rt,wdq1bknh*//n $emf$. 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 arep2s a0ee)0r, oohbnw 6f+avd+ connected in series to a battery. The time constne+0)w+ oh bprsa,26o a ed0fvant for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The (i(9yo+* fzqp,iopb)c;*e x4ry u bt fbattery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreau +if*4zy* eqpi(o,bcfo p9)btyr;( xse 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 same units exy;8a0z ;2 tfpwt:mbexcept:

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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 p6ip ,8e0trwn ygj5qj2 ower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supp k/ci *)jywg q,.nm8lvly. In this circuit, the currenl.,yqcvg)/8n m wjk*it

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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 : jcq wir24viydra0,i/2 vf)hwhen the frequency is tripled?rd / ih,0r2w:)a2v jvqi4icyf

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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 aczbly 12mr(7,rjjwo 5m ross an inductor is doubled, the inductive reactance of that indurjzj( b1o2ymw ,r75mlctor

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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 wvn *eycx u248,3nokisq ca5 a6+riz9approaches zero, the inductive re xuwer,5 8 9+nc ny qk2vc4i36azo*saiactance 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 ann ptdbz,p.+p oru *a)- AC power supply. In this circuit, the curreba.p-*p)+npoz, d u trnt

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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 chang:fwj/v6oibs 0o v(x +;zegl d)es by what factor when the frequency is tripled?ve 0oxls ;o6d g)f(:/bj+iwvz

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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 cl :e+z ir4r42ga x0ybjapacitor approaches zero, the capacitive reactance of thaiyg0ler jr bx 4z+2:4at 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 capacito 4 l*cyp:5w,9wsecmns8h(: lcg9d aqtr in a RLC seresdl w9:qyt (8wa cc95,4pc:ngms *hlies 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 xi6j8qu +;i-bdbpv1v 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 cir8g1-ju ; i f8*bl mm1k1xtnmuwcuit increases if R increases. When is1lxmu8fmim1 u1wn*bt- k8; gj 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 impednr.4pa rxe5mw0 q )gn7ance 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 /8hjm-gc0 enieqjov7, x4)r c the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC ser;*zrwlzn+u ,(mesxx1 j1n c;p ies circuit, the resonant frequency of that circu,(uj;r1l ;zpcx* +zxnn me s1wit 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 u3y94t9wn4nxzj v* qt 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 circt1)mrjt 4) rfq+8n kvcuit 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 radiu6mz7icg/6v+pu (ue . :jhaypis 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of c.vp+ m 6e6yuj i(ip/za:hug7 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 qp q.:mhcx:q/m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoq /mp:ch.xq: qr 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 m , r:7i,wb izc9rdih 04qmsl1t-s)oneagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at a-9r tne ci4bs1iz7:0qdl,wimr o s ,h)n 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 lo- bm; ydb7(qwkax(n/pv 1m(rz op 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 changes7n sfe)hgz6b e1p c 2-l08 kho.mmy1ku 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 of wire on a square frame with s3bmeu)em 30j4.te eca ides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average m 0 ).u4ec3bee3ta emjvalue 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 turk;+tji wv)tm7n )p(fkns 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 areav ea2 7;lppzi,*ii :rs $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where theb8 puur/f ues 02-rj0j u0pursre uj 8b/0fj2-downward 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 long rotates at a constant angular veloci,+tzwxvv 93t 8j j(snrty9 ttwjv3s8rjn, z+v(x of 2.0 rad/s about a vertical axis through 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 loopsk,f.6ro(* /63rcdgl l(wem zkhfn q)e and 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 wire of4bye zs8gfp k,q*8 8mg 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 rectanguj :/1p,f ad3 fwxamn/ pwp.mu3cf3g g4lar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a.ugdm,p:g1pw3pf/ wcff 34x /3an a jm 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 turns of wire of abet8i+9g ha;f4idnww(t95x2oe - ioerea $0.090 \; m^{2}$ 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 constrr yp5lo)q 1mq.uct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isoqlr 1qyp )5m. 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 maxi*gxg. + 3wwrrdmum $emf$ 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 sh. bgqs2; a2qof 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 resi6(v w) eo+p *b7z+* eamlfngakj8/rgrstance of 6.00 W. The motor operates on 120 V AC, and when running at full speer86aj(+ vrz7 ow*g )*epkf /mae+nglbd 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 supp/ dfd5; bzekt0ly. The operating current i0b5d dezf/;tks 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 conn6tj -gnndgvy.q99w4cected to a 24-V power supply. Then 4y9.69tnqgcvj-d wg operating current 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 f s:b/ld(n3ej connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t:l3fnbd/sej (he 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 qe og+66gb,h)c+ cq6 i7roi ysreduce 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 causes 14r6qnm7pp j02r A to flow in the secondary. How many turjr7mn26pp 0rqns 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 turns are necessary in a 11kbi - w.dabr0iti/ 2.n0-V primary if the 24-V secondary has 100 ntiw .- bidkb0r.2ia/ 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 500qdd jht;g z(-0-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wha (qhjgtdd0z-; t 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 prima:c5l7 (kx-pdk vc4icory of a transformer. Assuming 100% efficiency, how man :i(o-7ckk 5dcpvc4xly amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides+qix9-lt4 x3g e4tod88 mt k.ck: efmm 7500 V at 10.0 mA. The primary coiqm :c4+gtime9dkf x8kmtxt8l34 - oe.l 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 primaryl8 vl ov/j-ch6 coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secoo hvc8ljv-l6/ ndary?

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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 primymq8 iyy7 +p.3(ns :b8u psyogary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarpusy:gqn.s byoy8 3(iy8 p+m7 y, 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 1l vcwav2se5i4dn*v/; 00 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to vwvdis l ;cn2a5/4*ve 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 tm a xz xshr99ld6l lrs;+1eps*sg./ .jurns. If the input voltage to the primary is 100.aslj xers drs1l9 ; 9/p mhs.l+*gzx6 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If - 1egto2l)nxfks)5 rr the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losxkefo5l )n rg1)r-2tsses)

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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 isf(,(8 gnt imc4g n5zkn usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns 4(t nggnnf( 5,8z ckmiin 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 * nmkg 2u(xg7s120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of gn xgsk u(m72*total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A 9:i mftixe-2i 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 percext2if -e:9 iimntage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ky1.;d0akszn3fney v 9x;y 8 uk pzzbj*p818hgenerator 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 would be lost if the 0 keavdz fp9yxju81 zypznn8 13hk ; yk;s*b8.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 hak8d x9cm+ 1xeyl:ngnm8s82 a3h rth0rs 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 nd2g1ct+ 09mlrhr8:mseka8xhn yx83 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 8 zmq563 pyfmulkog-2 ts8d.m h2lyf96-W line at 1000 V. How much less power would be lost if the power were transmitted at 300gu886mmmz splhfq52f-92. l 3 y dotyk0 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 /a7wz;fap/:ao 6sla dad bj0hs( ng,*is 440 V at 20 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 the power loss in transmission ha (sl, w az/a6g7/pbsj0*oana:fd;d 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 energy is stored in(vyd (cb/.o pk the coil's magnetic fie(vd/(bpoy ck.ld?

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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. Wh w (xn0l*obwal58a3x4nu ulv. at is this circuit's ti0unlx(lw43*wvnol aua8 b. 5 xme constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmsoy08pl.py b 6d 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. Whabvzk ft:-8tx3t 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-x3q+ *xhf; 6(trad- n+o b/qiaaoad .gV AC outlet. What is the resistance of the lama q3+ ;driox-(n+to f da.6 b*qaha/xgp?

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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 qfxp9f5i ;vtwk4 7 hs gv/j4k)power supply. What is the peak current through the resistor?jwq9p )vx7t4gf/4ihvk fs ;5k

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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 connew3m q g(f,b.e fl1d(slcted to a 120-V ac power supply. What is the power dissipated in the ree3lbfs w(gqml .,( 1dfsistor?

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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 os8qpg()w5 .tieb9st/.l r liis $I = 0.80 \sin (240 t)$. 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 wazg-9/bd2hu 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 50-W resistor i2)hgpl,ku m 78sfi mo-s $I = 0.80 \sin (240 t)$. 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 at 60 Hzrky* x ++/nlyq?

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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 reactanci3smas(tz :+:sbcd t8e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of indu*tc05 l50cb eq u;afgoctive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10060f )zrm: vppj0 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 atk 0wp/h/;fparlb 3. kc a frequency of 20 kHz is/kb3k/0 wfh appl.cr; applied 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 a 110-V, 60.0bs;bmw(j **ia 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 reactd c1lz nsu(-g;tc -9 .awxr6jsance of a 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 ney 6emr/4c0rljeded 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 10-mF capacitor have sgzkco 6p-m*dt0d-*dcm6ve )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-mF4 :i e)u x z*vnsnp+8gj:gtll1 capacitor be 100 W?lgj4u)npzn8:x *i v+tl:1seg

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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 capacitobf qa cjw27)8tr at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series cir0 9jc, vzl;f vxnyur1)llc+o+cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti9l;olf1 l c)x,0cy+vvj +r nuzve reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W re*n1 bjcz5ds, iyaa,h70. deahys0r9msistor, 20-mH coil, and 1.0-b ae9hyi .y ,5 amrn71zssacjdd, h00*mF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 2gwd (pgx s4f7yz 03bu00-mH coil, and 1.0-mF capacitor are cbxguy(3f7p d0s4z0gw onnected 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 ir8 8qbz3ro,lg ; ksb6cs connected in series with a 20-mH inductor, what is the impedance at,qb3rg;8 ckr8 s6oblz 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 series with a 20-mH inductor, what is th9(dqe)yzsjr qzuk *qr6oq.01 e phas qu q9r10s6j o qkz*qr.dy(e)ze 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 1.0-m1:9;kh.iv g oqz0vsl uF capacitor for a total impedance oz k.v9:qu1gvlo;is 0hf 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 sevirlse1b8b2+s .7p rlries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzsb +pr8s.7r1i2eb ll v?

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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 wifl0 .yj em-5olth a 450-mH inductor at 5000 Hz for a total f -l.y0ej5omlimpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in serh+ za27qn+w tj4w 8sknies with a 100-kW resistor at 1.0-MHz for a total tw8z+2s 4aj7khnnq w +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 seri fnkbr+,b +te-gnft o8y- 3i)zes with a 20-mF capacitor. What is the impedan,fo e bf8 g+i-rnzt-+t)3nkybce 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 capacim *fw;beoj+: aps3q( ftor at 1.0 kHz for a total impedance of:fs3ebpm oq (jf;w+*a 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 sek;b;hq2f+qmw ries with a 10-mF capacitor at 1.0 kHz for a phase ;f2qkqhwb + ;mangle 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 -o pmztnhj4+i)5sa,p4 vja) cin series with a 30-W resistor at 1.0 kHz for a total impedance of 45 ,c j p )4pmjs+5ota) ihn-z4vaW?

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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 7gs/t7* n8zbkdr0o k jwith a 100-mF capacitor at 120 Hz. What is the phas80b7kt *dj7 r zok/gnse angle?

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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 Hz8uehi.n8*yp nrni ;*t if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedin*rntpi. n h8e; u8y* 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.. m+l3 t a*b/p/u et+:d rmgrb9jk:cqq0-mF capacitor, and a 0.35 m:.*/eb:9/ rqbralkt3dcpm++ tugj q0-H inductor. 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 reactag 9f,mmn3ns g7nce 30 W, and an inductor of inductive reactance 30 W are connected 9mgms37g fnn, in series 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 50-Wdr hdr 1qe3+)tk c5giy k;/rb( resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hrd( +d5eh; /tbryg k)cik r31qz 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 resb ).n*2ioi 4m m;tkgi uvu7a.fistor for a phase angle oi* fba )kvuomgiiutm.n74 2;.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 haw1e e nf tw:mcjz7-m:9s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order t-: efm:nezjmct 71w9wo 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 ceb sy/ydp1 x p g0 9m,9e1rmho4sdg(z6ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cihrssze 1pgdg /by o0x9m y9me6d(,p14rcuit 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 Ay(ca c7hy4dktk;0 ) 2ni(ouwo;fi(adC 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 imk5ecyirq6+a 4pedance of 60 W and a resistance of 30 W. What is the pokryq ac 645i+ewer 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 contab c 93n):qp ae9hcikf5+ci ni1ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H induccf)kiq n9p:cae1+ ci9b 35ih ntor, 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 fz;tkz 6 s)5xej+5oql frequency of a 1.0-mF capacitor and a 15-mH coil in series?z6lj55q z;+ eotkfx) s

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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 f/rmxa/60z3 x7cv8d6uzvx /b;a tt px4.7-mF capacitor for a resonant frequency of 10 k6p3xxuzd 6 mv0/tcvtazxra7 8/fb; /x Hz?

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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 f;;k ; iy;yaaputg2 vai 2mrn34or a resonant frequency of 100 a;yp2iyai4n ra m;3;v2ugtk ;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 py8sb g+j3yx2/g/az t slaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cir+b2xjg3/g8y/ z syta scuit is to be 1000 Hz?

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