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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 are1 rkyr9gcys , tt1/7mh units 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 indfap4-y0 8vnso q,i8zwa 8*tmb uction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil st7)fd5c5 vziproduces what kind of change on the iv75d) 5s tcfzinduced $emf$, 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 l(1sw;kh jeuj uhfxhm/ (mvrw-t+ cc /7r+s49of the magnetic field through a loop of wire produces what kind of change on the imh+v l4u/+um s 1wc ts9/-k f(r;jxehjhrc(w 7nduced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on 34y4 y vd-,kjt;ayts4mx/tir the induciv 3yy 4ymtt/t; -akrx ,44djsed $emf$, 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 mdcwkot1w( 2eb34y1o 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 direction of an induced current in a conductor wi4gymxtn(hi ;d)jet0 c66c g )su.4xtp ll be that w idp0 x;ttcjm.)c u(t6 44nshgy)eg 6xhich 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 held abo5mu6 jzf6b/ix zmu:4hve its center with its north pole pointmu64 f z/m6:bi h5xzjuing 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 a horizontaltkt*b: ye3( ub 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 abovt b (3uyket:*be)

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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 rege wdz*7q2kuk +x 4gw xl)m11xkion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of theu x2xw1 74zgl*w) kxk+1keqmd 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 theo(u .gunpl7. yle:m 8u magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fy:( p8nl7 . mugeouul.rom 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 m ju :ydbwc+.udlk6+gr5e,z)horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When view:e+u,udbzr5lwd. +kj)ycm 6 g ed 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 horizontae5 jgv gw4z;h,ln:- bn8wt p(nl table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either sit(;-8nv4njh5 zg,lge: pw bnw de 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 wittpdeq0/ 8tg 5;xj0 bwih the north pole entering first. Asw0d;bpj8 5ttqgxie0 / the 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 speed about an lni+j7nhce7igc 9 wv t.c475p) n3 iqd9k ex)baxis 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 thl c7iqd cn+ wpec4599)nnibi )7hvx gtj k.73ee 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 conopadi wv:hg.j:,,o lc 60z+l.q ax p4jstant 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 lqa4:.c.ldj6, izah jwvoo px+:0,gpl oop'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./o ceqmin 3ktlw3a4w.5p cr87
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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 tha + o(37ztqsub*v kpem6t 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 ,67b) 9dfe4a+p;vc pq maazlz sew+1z$emf$ 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 mov4( f/kaioxu:v ed northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the poteuv: a/4(ioxfk ntial 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 rotav5fs )hj. 4uocxj;ma 6tes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformskmm:z+e l956 x:js soc

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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. The frequencsfmw,cl m)oj- 4sml; :y of th):,c-4 wmls smjmof l;e $emf$ 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-9l4z+zi p7y- h7 7cnwe vpaam

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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 th: prz)g*i8v3nfw 2wk yat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prs4 a 8z.x+nz0h cykdb9 z2z,1og w7ygjimary coi jwcz4g1.x 8zshn,70z2k 9bzg oy ayd+l 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 conta,4ncx:x8p oxnins more loops than the secondary coil then it is4x:op ,xn8n xc 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 input9 zbrdey0 g.z4

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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 ci9dckmnnh ,55 qrcuit,

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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 tcff vcq24;k3go an ideal battery of constant terminal voltage. At the moment conta;cfv2q3fcg 4kct 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 zn zva q 8c73 uwprt(sm3*/jm-are connected in series to an ideal battery of constant tm 8a /v-u7qm*3(ctpwz jzsnr3erminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conhi t s(y 4hd.pkuxfq.7g1lo:)nected 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 inc;wah u+-td6u ductance 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 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 tsq*ulx5*ux9 t0:q qg qo a battery. The time constant for the circuit represents the time required for the current 5g 9xsuqqx*ul:0tq* qto 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 uz8v 1+du1bwwzdn bg+c3w,z0a battery. The battery is suddenly removed from the circuit. The t,1 ddwuzn+u31v0 gwz+cw 8zbb ime constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uny*k*y no9do* dl1wi:hits 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, th51vyg9ex ygp (b. dzt3e current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In o/,sku9c5n bea: +c8 sq4mlm-hda w+ uthis circuit, the currenkwem5hm9a c + su-a/n4q,:lub soc +d8t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanctd 9+ pa1xquls)2x1jsse5id*e in an ac circuit changes by what factor when the frequency is trips9x) 51idu+x ep s*2jast1 ldqled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the i36yi(u2 nmuj-2pc5/jqupnx 1 gi3 leknductive reactance of that induiun2 pj2pm( 136ju c5xg q/ln 3ieku-yctor

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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, pg f9zkl0 pgd.vk;-;c the inductiklkcfg-;pdv;z 9 0pg. ve reactance 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 this circuit, the curr j:mifs: 5(bzwexyn23 e2yezf:3bn iw 5(m j:sxnt

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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 thvq tkbeb (0iy)f,0h+ye frequency is triple)if q0h(0,ybvt kyb+e d?

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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 zel htf3zp*ui+ 5 .d9jkoro, the capacitive reactance of thuilf+tp9z5k.3 *j h odat 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 ind)e*av:0 fj rmductor and capacitor in a RLC sfe0mj dav)* r:eries 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 defif pu0 m+*cuooz.97 ticned 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 im p*(qov8dic1 w7lex a5pedance of the circuit increases if R increases. Wxp d5l(ca1e*q vw i87ohen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit.e5a3 ctntbktqmx82 w she.l (ct+o9)9/h .epe The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Thgg fb4+-da03 sejn*sse 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 capacitance both double j)pdt(5df9c; :lezi/ vd9sh7ldw9f a in an LRC series circuit, the resonant frequency of e9 zdd)vl5c;(wd fp:tj9di a7sfhl9 /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 8zzqvgel8 3 +k(dsf9g/+ wsut by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuitl+a.6 tl gqjj( 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 agdf 5z)w ch-8 tw2uxl+ uniform magnetic field of 0.20 T. Find the magnetic fl8x-tudzc wf 5g)+2whlux through the loop when 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 i( 7o7yiozt,mzc4,ro wj l/k5in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mj lz/r t,m5kzy7,i(o7 i4owcoagnetic 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 uniformleum8 1n0 pi(a magnetic field of 0.20 T. F u8ap (nlemi01ind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loo;4 +t1ysxa gghi0s1eip 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 tg4vgt ) ,zn2zchanges 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 withr s+xmmo4w +i: 54atqr 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil.mwrx t +qao:+5m4sri4 If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tur(;vl 5zh s8h9zksn l*;tep)rxns 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 ah3t9p z- w znv;3tph:)bd o9wuhw io:*nd 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 fliesi :;z41d7r ckvifut z: horizontally at a location where the downward componeni;:f17d 4zzutk iv:rct 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 w iqdoz .s6lyydi2.jo.w8c3 2that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of3d . .iy2wd qswj8oiz6o2cly. $5.0 \times 10^{-5} \; T$. 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 loa4aeg 2 (uuf6dops 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 c l4had.d-j0s100 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 $emf$.

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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 rq205tzh ja qe:0om/z8 utmfn kr389 ciectangular 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 uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximqnq8/9:r25c o3zfkmtheut am0 i j80z um 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 aru2 m,nn (v22u vn/i)qxx5xnlkea $0.090 \; m^{2}$ 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 ca0x( 7xv:;n sy4gikhwith an output of 12 V maximum when rotated at 60 Hz. A magnetica(n y s7xix:h40;vk cg 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 maximt- )gd,crw( m:qn0edium $emf$ 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 motor operh )6x;(u0ob fc5pgk xxates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on -pcs6xgx;j l8e-j lbu6mo6g- 120 V AC, and when running at full speed it gen6j p- glogm8 6bes;xluj6--xcerates 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 resistan1ii x/cfn ( i s,jev+ap,r2yn1ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. ,ixi v+e r 2a(jn1ns/i p,f1ycWhat 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 ise +ey2 bhgpf+; connected to a 24-V power supply. The operating current is 1.0 A hp +;yg2b+e efat 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 b-( :kpw0vqvcresistance 6.0 W is connected to a 24-V power supply. The opvkqw0cv (p:- berating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red,2 xq.it zwlx2wlx53duce 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 transform)/d(au gn2ts9tk c5 paer causes 14 A to flow in the secondary/ t 9ap usd)cag(52tkn. How 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 turns are necessary in a 110-V:0hx kghrf:*z primary if the 24-V secondary has 100 turns*rhfh :xzkg:0?

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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 2tx7e0+,-cne f*om jn q:jd mc9000-turn secondary coil. If the current in the secondary is 3.0 A, what is th7x*c-t ocejd,+fq9 enj mm0n: e current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effi6nmes oo 6r-o+ciency, e-oo6omn+ sr6 how many 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 provide b lr7 id)5he.im13s13xst lvzs 7500 V at 10.0 mA. The primary coil operates on 120 V. What do3 )dl1.esx b3 l7tz ivi51hrsmes 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 300 tur++.fanypf1+) wn kejw ns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presen p w+).kfw1a e+nfy+njt 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 primvmvk: n+(ac)y ary coil and 300 turns on its secondary coil. If 120 V(mvyk) c+a :nv 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 transfor7lq e, g3b.0iw rxj2b..(pzzazz )ulq mer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we lb ,zealru0w 3g(q )7z qz..ip.2jz bxcan 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 itxbt:wbg74n7*gnvi a /js;u6 bs secondary has 200 turns. If the input voltage to the primary 7bjx4:v* ti ws 7augb;n/ngb6is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a trans+4k 3awp30ddme8hqcp-k5 a xrformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the se4 rxkp ph dwkm8a3ed0c-q5a3+ condary 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 curre.fahh bid:6/p.9qixb y+ah .xnt 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 number of turns 9bi/6bix :y +qh. ahpxa.d.hfin 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 usually steppedh5xp kd jlo;om *;2i6i up to 4500 V bij;ilkp ox6o m2dh5; *y a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualzo/t :udiz iapui (g)* 2t1(mtly stepped up to 4500 V by a transformer and transmitted throtma:do/*1 gu(ti(2pt izzui )ugh 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 line 50 km long has a total resib.f:ld lpt; z y:)ezzx*cd+ 1bstance 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 percentage of the original energy would be lost if the transformer were not usep *dyld);xfbtb+ z1l zz::. ecd?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission liybj e9nm; c+8hstle p+3dg9v 4ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to r+p j +8vhtsbce4 9 gl;3nm9deyeduce 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 z0 eim-s;/nte a 6-W line at 1000 V. How much less power would be lost if the power were ts mn/-z;ee 0itransmitted 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 sfoc,j7mr69(xms/ mq;be n- cV at 20 A. It is to be transmitted on a line w jxo9sqmnr;7mfce( m b-,/ cs6ith resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the comww- uhic cx 67e2m; dymf cfk+040z5hil's magnetic z dwmh5cf;64u00fccxew 7y2+ mhi km-field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is7xrstsf0+7kru05 qcs this circuit's time c5fr+krx70suts 7q 0csonstant?

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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 rms volt*tjv 8js4 qan;age 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 thrz9nvra w(j*,e peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is t e n 9zee:7.hppfhvm).he resistance of the lamp :7 vefep)h.9pzn.ehm?

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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 supzif t.v5j 6d ;kq.g0ynply. What is the peak current through thevf z65kt.;.gqj 0idny resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.-o-- q:q:oocpy hb 0an What is the power dissipated in the resistor?-po:q:c-b-oq o0ahyn

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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-Wa v5eu -icypaus3/.0 o resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 4;d yxp,r-/+uhjp wl4wnqnu *$I = 0.80 \sin (240 t)$. 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 7eg d3a uyu.jgj bm,f:s(5h4yis $I = 0.80 \sin (240 t)$. 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 ad9trud) q;eu0t 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 z/ mv: 6y;akfdjm )sk-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 induct37)y*ps1fzctv1;j:y8 bb d jcen /xv yive 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 inductim il6x7 bbeh0*k m2(ixve 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-ma a bru6u0dr.exqv 78+H inductor when 120 V AC at a frequency of 20 kHz is applied .6aaqrr0 v dbe7 ux+8uto 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 throuqpf uc.:x24;.d; qt0kvq ryysgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance dm7d tt/hrb zs+9.cp:(*w nglof 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 needed to have 50 W of capacitive reactance at 10ry3 wc70s;vlrhw : u xs8svq*0 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 reac 6;iacj9fs1lj:y)is4fvlpwu03iu y+tance 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 capacitor be 1w7 ;msq2 uwv,-y( bkye00 W?ykwywm 7e; q(b2, svu-

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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 vy ict:+oe;i (d*y:l5kgyc- q 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 circuit with 4p; xhp+zt)e ;vhzr:o c9hh3r 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive oh rph;+ :rc evz)thp;4 3zhx9reactance?

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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 1ej /n-do0m ktuu9s 01z00-W resistor, 20-mH coil, and 1.0-mF capacitots1 eom0zku90n /jdu-r 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, t0r hwqq daylk2 7ifq26:vsu,::wk9 n20-mH coil, and 1.0-mF capacitor are i:u lrwt 2kq yd:w:q 2s,97fnqhvk06aconnected 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 y++1m tnwelc 5t.e(zx2fa7a nin series with a 20-mH inductor, what is the impedance at 1000 n51mz act( .a+tenf+yexlw 27 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 induc-.dvuy ncv5jy* 7k9n qtor, what is the phase angle at 1000 Hz?y7vq.dy5 cvu * k-n9nj

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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 cxp4z6enwuv 3 d3/p;u53ry r3jn faz7 toil and 1.0-mF capacitor for a total impeen6fz43 nvwd/typ3;rru p5jx a3 7 zu3dance 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 (ol pp;i.wu/p100-W resistor and 15-mH coil to get a total imped p.owpplu/i ;(ance 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 ino b.*q wm0bw 8odaxt-7 series with a 450-mH inductor at 5000 Hz for a total impedance xtmwb7d* ob-w.o08a q of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resvff ,fmj5u*t4o4aujq ( a* 7gmistor at 1.0-MHz for a total impedance of 150 kW?uo ,u*q*(a5 m aj4gf47vtfmjf

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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 con:z ;jt7z(cijwnected in series with a 20-mF capacitor. What is the impedanc7ic ;wzj (tz:je 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 capacito k44c*f q ag2tatn:/kgyg3*l nr at 1.0 kHz for a total icl a:g42 n/t*kfagt4qy nk g3*mpedance 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 ne0,(517 hz pvhv4axj;yohlzczeded in series with a 10-mF capacitor at 1.0 kHz for a phase y jza, 41oz5c;h0v hvxlh7zp( angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in -wt.jhylfgjx 7xn vb/-3k,g 2series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W? kg.jvxbgx -3t-f/jw,yl27 nh

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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 capacitor2ieo69 j 3vs riic0jd6 at 120 Hz. What is the phase angle602o6jii9eds ir c3j v?

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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 5.00ok 6c1gr)u wj V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serierku6wog) 1c0 js?

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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 -5vv79zoe ui1ys eds5a 0.350-H inductor. The circuit is connected to a 120-V, 607vss-51yud9 eez5 i ov-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30a1/p4cujzs ppjrjm,*y 1/j r - W, and an inductor of indcy /-,4jrpzspp1ja ju/r m*j 1uctive reactance 30 W are connected 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 containir(;h, z 0x,e:ghpmmkwl qe*/+m1+ llrofou .ing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?.+x lre m,zl(o hqp1km frgeh,m: /lo* i+;w0u

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necej64oycm sli6z5-nf 7nssary in series with a 500-W resistor for a phase angle of45oji-6n mlscyn6f 7z $40^{\circ}$ 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 = 2c.6z4fxvds f *3e2a k24r igxw0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from tha v2kx46*i 4.def gzfsxr23wce driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wit.x l):: jlpsgoh 12.0 W resistance, 15.0 W inductive reactance, and 10.lps:xlj.: )g o0 W capacitive 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 an A1:f)x ts6pzdsrt4xx wb;fpl6l s-(iu5 cc c/6C 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 cu1h1 hpdld5 *of 60 W and a resistance of 30 W. What is the powerdpdh 5 u*hl1c1 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 containing a 50-W resistor,:rev gx e az,jf9:1ydgop 3hhy;-)vw5 a 10-mF capacitor, and a 0.45-H inductor, when connected to;y -)d:ehgpayfz o1 :g9vx 3whvejr5, 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 f(a*o ohiz1ixrd;/6 v irequency of a 1.0-mF capacitor and a 15-mH coil in series?* /i1;oio rxvia( h6dz

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a 91 5/zw5 m o)pvgfgezk yz:vd4resonant frequency of w:5gdzzp g) o4v5zekym/9fv1 10 kHz?

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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 serr dn,rifbg(m.u z.14qies with a 3.7-mH inductor for a resonant frequency of 1000 Hmz4u.nbigf.,(qrd1r z?

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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 w7c+znt w8(mi 30-W resistor and a 40-mH coil if the resonant frequency of+icn wmtz8(w7 the circuit is to be 1000 Hz?

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