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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 un+ixs(p zhx ldk7p+ 6h3its 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 s ln0k -7/(fmnxfnp* qytates 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 wirem48d0m28gctw 941 cxm *me;a fykwtn( bku4ii in a coil produces what kind of change on thea8e9mcty 84ummd04 1tmib(2 w4;wgxcnkf* ki induced $emf$, 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 loop of wire produces whacwgebb2 6 ook6 vqwf.fd/1aw+b0 /0rut kind of change on br660uo e/ fcb bww0/ ako +gqfv.2wd1the 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 ok.khpdn :++(znbvu9t,;h h j of change on the indun:t9,hd nvkh.k o+zbjpu +;h (ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fieljhu5n6a/)dgq ;iv )dzd 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 ce )jx*butce 7)) bymj7onductor will be that which tends to produce which of the following7bu7 y e)c*)xjm)je bt 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 u q.wbv (.k4wbflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducbwwk 4( ..vbques (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-jvg(9bn b;ts bar magnet is held above its center with its north pole pon-b tvb g(9js;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 table top in a e7 w 2mewdp-*tregion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this copdw 2t eme7w*-il 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 magnetic8qb hkth7d;vti4 p*adk+ ta7- field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of kh7t+ k4tivd;abq8d-7t ha * pthe 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 horiz;ctc wke7x;f5 ontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inducecxc 5t;k7e;fwd current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cdd/y7sr ) wo.uuro/y7rd. )w sdurent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fcg mslv8vfo3:8 l/ rr1irst. As the north pole enters the wire, the induced current will be (asl /rfcl: 8r13v8ms ovg 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/mqz9da:4xug speed about an axis whose direction can be varied. In a region where a unif q xduaz4mg/:9orm magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated ata*b bd5*gb3r e 5s:bla h6zcx4 constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field 3gl*e6 crbhaz: 5b 5abdxs *b4points 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.su 0x vmpid)s*c8)r8t
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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 thatw+rm m8ka6.ljvn/41r)h x hu le;xe9 s 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 fieldp+g/j pycjfguhk nb;9 2k,/3n. 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 (oriented4hrqos 35vha /1b;uo8jbni d; in the east-west direction) is moved northward at constant velocity through a magnetic field that p vd u/8 ho;br43as5q;ojhb in1oints straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at q t x:zabmump696/y6la 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 p0ldquz7fqc /ee6 3)nv6 o7ojtransforms

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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 d:k5jf mk 3ix,60 revolutions each second. The frequency of the ik,mk xfd:53j $emf$ 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 usedt3f q5gco+h3ydkb0j l+k qv(3 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 tz/t.msz b bp -0(vru8bhat

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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 i2 f2j xyp(p cz18 aewoeiyk,81s8 ,oncontains more loops than the primary coil kin po8c8,1s,yixjwe zf2a e (o18p2y 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 co*c(wcr 8gj)htn+o b1g0/slg a ntains more loops than the secondary coil thenn/0j+cl ahbr* go8w )c(gtgs1 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, th6y bz el9ua;zh59aai.e power 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 resona 2hv)nva/dky av6i0y9xzuk(a.b 3+k y 7( uktdnt 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 convm 4xax541+viye8ja j nected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vovymi j+4 81x5ejvxaa4ltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series ml4i ) bw;buyc2 sb4e)to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducuyb4b;elmc42 ibw))stor 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 conneq)bi+ci*y53q.aw eg i 04ceuected 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 witcpl5oo09h j0sh inductance 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 indutf /64d4mre;) h vgbjix; tdj7ctor are connected in series to a battery. The time constant for the circuit represents the time rvr7;h gd6td f/x;4b mjj)ti4eequired 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 connectedtd zv*; 52ir6p*kba nj in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cur djt5p;rn*i2akv*z6brent 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 un4gtcl+ pn(i( d5i o0ewgpx9( yits 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 currentmwvyzaa hr e-6q*370x

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the currenq-;jau( g 8i dlbd:yh.;j:di bd8gyu-.( hlqat

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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 circui5p; 03qbqbf : a6xxinrt changes by what factor when the frequency is tripled?bri p:5f xq3q;axn60b

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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 volta9p 0 7nn/pf ep6ti1cefq.pqy.t*q+r kge across an inductor is doubled, the inductive re0kqrppp/ fpe.eti+ nc1.n* 7tqq6 f9 yactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zerooahd+iaz)95ma a04 i d, the inductid04amiai 5o9a+z) ha dve 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 currywa+zauc;31 m 2 q6z-4 56zddwnylbu een 66uq2n e zzyw-3 z ;mcauy5dlba+d4w1t

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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 z h4,b i(t ;opaj.gt4vga)e g+the frequency is tripled?og4,tg az)hvpb .eg4 a;t(+j i

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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 acroihk86oh w o y,8o)tq;oss a capacitor approaches zero, the capacitive reactance of that capacitoroko8,;)h8o yqot hw6i

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in aszyzfpy qsa1p,xjeiw-*( 7egs .(f6 , RL- ezp,.sy ,jfq6wys* ga piz1xes (7f(C series 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 circ)p(pstws n.6 vgb b*8j 2sw.ssuit is defined 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 circzu nl)6htq;0m h24il h efi7v,uit. The impedance of the circuit increases if R increases. Whfe 0)v,hl6i4l zmqi72 ;uhtnhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuitsb8,;j*mc j mc 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 impedan+5imm(w+ bee 9*)pkd)hgb,e8felb qm ce 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 in an LRC series cig ys) if76a*bprcuit, the resonant frequency of that b7gp6 ai)y*sfcircuit 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 applierzjr6 n5nx v1+saq am(/3, ,afnqu -qqxf4 u0ud voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occu jjpg7 /5gm7mm;d)hy lrs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a krkk9kl x z z5(t:5kg-uniform magnetic field of 0.20 T. Find the magne lkk(xkr5kgk :t-5 9zztic flux 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 in a5 han upgg+h+/ +tx,4qywpde9u v2wq, uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn+ +,gugq5v,nd /q4ax2h9 puyetw+hpw etic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiel-tp5 i l3u,tkvwl,t) xd of 0.20 T. wv)- xtt5i 3llpkt,u, Find 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 a4,sso737uaeqi g8 ,u(1iwgq)uphchk n adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes 3db 3p4x 5; i yyzk/x6bubvhw.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 tucf,9 8x*s,2hltfq cnurns of wire on a square frame with sides 18 cm. A uniform magnetic fiesnf, l tch*89 cq,xf2uld 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 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 tus3zx((j xd at5oy6*curns 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 anbil5klkmmk 0g-)0(n w vtb+ /id area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontalgxdp + h36q,;buj u1)pa9odt qly at a location where the downward component oo, 3;g) uda91qb x+6tdpuhq jpf 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 angulv , 5 t,mxya**e2bvrvsar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic f x, ayr*2ev5m,tb*svv ield of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a c c4vprb0i72 guross-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 consi) vqy45) ukvbr rzd;go. 7z2wqf54vtjsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 armaturejxnvvi .jhjl-lqyh 2s 8 343w.. 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 l3 n2.3 qll-jys .wjij48hh xvvoop 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 consistwbp +kf5y ep8t (s,gt7p*p3xws of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generatoro pjxil+ih6- /,pken3ek*t . vgowe39 with an output of 12 V maximum when rxg.hto -l kiop9ni e6/,j+p3e v3*kewotated at 60 Hz. 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 fwb5.28avonz generator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor havey .,dfy; c1v*lm gcaf3jy7ln5d qw62o a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance xbj;u9c) p iof,z1wzx,0znp 4 of 6.00 W. The motor operates on 120 V AC,jfz, pbp0zu9xo,4w iz) ;1cnx and when running 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 i*af4k,pyt m9 ts connected to a 24-V power supply. The operating current is 1.0 A. What* fktpt4,a9my 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.qm388; q4 3vxjxtaieh 0 W is connected to a 24-V power supply. The operatingt3xjxim q ;hv q84a83e 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 ,)eizu 6ukud 2connected to a 24-V power supply. The operating current is 1.0 A at fud ui,k )26ezuull 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 reducx ez5;0oaf0lehy7m (p e 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 14 A to flow in agu (ab9 2.0w1nge ekfthe secondary. How many turns are in thbnufwg e0a1ak9g e2.(e 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 7fj q0:iggqblk 35y5oum5k buf2* z3b primary if the 24-V secondaryq7 gugiujf0fm 5 qk: bo5lz2b3y*3 b5k has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a swpadc8l sufmwi *2i39,: d;n 2000-turn secondary coil. If the c82fms dinwcasip, l9uw d;3*: urrent in the secondary 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 pu+j5)mxb of( hrimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow f umox5(j+)bh 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 7500 V at 1zf z4 .,9d6 xjxl7edl-vogg5y0.0 mA. The primary coil operates on 120 V. What does the p9y,j.x -4 go75gdlzd6x evfzlrimary 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 pr o;m3vfy7u7kr imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary7r73 kfmy;ovu , 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 coil4 b6lv ecny8kwj8p5thf 76(qv and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary? qevyc6lt8b64h8w nv(k fj57p

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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 transfop rb*,k(gl 4gbrmer has 100 turns and its secondary has 200 turns. If the input current a *pkgg4(bbrl ,t 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/ nvz0n *tgvfc , iua/d1(t-dw0piq(y has 200 turns. If the input voltage to the primary is 100 V, we can expect the o-0d1i0tv/qcypva,( fu /z(wngit nd*utput 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 tuxs 5m:;+lffnj9 z-wueo ;xra 3rns. If the power input to the primary is 100 W, we can expect the power output of the ;lozwr-u+xf39xf;nas5me :j 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)t dm 2 nyov14e/ge*lx 60 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. Fint2gvym *e1)lx od4/end the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v1dyc1 fn:q 7gaoltage is usually stepped up to 4500 V by a transformer ag d:1 7cynqf1and 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. Tho0elt 3ajn-gbld54u 7 c.y4cqe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistabq dtc0y a.e nc35gl-4oj7 u4lnce 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 resistance of 0.605* mu / on:9fvc l9isxfxv27 f;mgr im:+ys0al 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 transf; 0sxfux m9li:vy2cv*9an5:+ 7 sf/fiog lm mrormer 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 5 ,b4eh,heyeg20 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is losb,4y2 eg,eeh ht 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 * 7*h4u2cakj 3imyrnd0 V. How much less power would be lost if the power were transmitted at 3000 V kyi*m3 ra4*7cj hdun2instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lib7c jm qi4n16rne with resistance of 0.60 W. To i4q67r b 1mcnjwhat 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-tycvga*l3z7 in the coil's magnetic a lgct-yv73*z 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 contamj;; omk4 e s6mouco8jxk *fcsx;o,nh*k3( 2yins a 6.0-W resistor and an 18-H inductor. What is this circuit's time cono;s,mm hoyx* mk;;kk(6o e fuj3*jcos8n2 4xcstant?

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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 voltu j6r-d jrl ar,aq1e):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 the peak curu6 ty( 7g8zedrrent?

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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 the resista 8/+djlt wzn-a 8(dob.jf z4k,jaow( fnce of the lampo8(z jwd8blzkaf, +4/nj(.j-w do taf?

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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 zmrqdr9)rbcrw)e0: chp0 0 5x120-V ac power supply. What is the peak current throughp)wrdq:xz)mb5 0 0ec rr0c 9hr the 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 connect+8h3k*5qptnl,7rqku lc b2 need to a 120-V ac power supply. What is the power dissipc3 2 ,kq* kb8rp7eluh+tlqnn5 ated in the resistor?

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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 rm.1io6os ig j2d9t me(esistor 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 (.b)yx g9a7r k.onctd 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 ::ndi e-l d:h6z(mssdis $I = 0.80 \sin (240 t)$. 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 kih8ktp s;frcz6 ys- -:38s xqof a 1.0-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 coil at 1000 Hjaer: 8gf +.piei 9u5wz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive react5 olf5 elsk9v gr*9p*pance?

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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 induhmn4d-,p zxd dzf ;le e1t-*m)66xsup* oge-lctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kjgs iu8 pp9xn86p23i kHz is app9 36p8skiin gpxj 28pulied 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, 60.0 78yvc3 0kbbcl Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 8x41zufbr l- :aa*aon 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 10jr4.6v :ga7f 7lrf5huw9uky o 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-ets:vift/h3 ,:vx.7 3vm: enufj dgle2 6wz 3imF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 Wah*t sna 4pg2yp6+ 4kl4n +*gsp4tpak ah l26y?

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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 0.00jcpc)1 ng8d8; +d0(nokfw vrx10-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 dg0wea04 zqgis gz,;:ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react dagziqg;esg0w,z4 0: ance?

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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 Hf)lj4(0 wyo* ia n)uv*-audmy z if a 100-W resistor, 20-mH coil, and 1.0-mF capa-)u)du( nwofyja i y*4l0vm *acitor 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 resist1zjr2y5* c y,*:dwsg w4rmazzor, 20-mH coil, and 1.0-mF capacitor are connected in series, 4z:ydrz w2s1 wagjmczy5r **?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the i2o2,m mp/l*q2pcau9 f a 4u)6dyyxvfs mpedance at 1000 Hz?mcl f)2y 2q4yax2opa vs6 pd/9mufu,*

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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 thecntxmt76*tw3gt*nh 4 phase *nm* t6cxh73w4tn tgtangle 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 cir,isgds 8 a, ql2hg r8,yt;tp2hcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1 ,tp8 2htardg8hgssi l,; y,2q00 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 n-rfhux5k(j8nzu2 1 tdeeded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20005dr uuz( hkt2n-jx8f1 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a t, e5q 853hwietbtph4s ;l fbo 3.tuz2potal impedansz ;e23ptithwhp b4 et5o3lu,bf . 58qce 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-r p+e ch*mhj4 put in series with a 100-kW resistor at 1.0-MHz for a tota-hrp*+ e jm4chl impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wixc wu79szewh;1hr9yr g 1+c. ith a 20-mF capacitor. What is the impedance a1wzy i1rw .7ce9xur9;g c+hh st 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 1.0 kHzmvn-u(+h)gr.tx 1dt i,;9 mpe)p tudz for a total impedance1p) dtt x tiz)dmhu+9,-(nrupmvg . e; of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nyx .owx 5ixx.7eeded in series with a 10-mF capacitor at 1.0 kHz for a phase angleywx.7.xio x x5 of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resih0w e0.0i5wwupezqr7 01 bnjzstor at 1.0 kHz for a total imp0 05i0z wwrp u.wj0 nh1eb7zqeedance 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 Hz. What is the phae)1 f jlz/c6mqse anfz6 ) cem/l1jqgle?

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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, and 1.08 g0h2qu;phuu-mF capac 8ghq2hu;pu0 uitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, ap mm td35i eg0i.;;wy*c0yzue 10.0-mF capacitor, and a 0.350-H inductor. The circuit is conne5e.3ydicmimueyw 0z ;p;*tg 0cted 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, 16 1xos8 adoaza capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connecdsaa 1o61 oxz8ted 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-W resivzuu+ 89l2a hmstor, a 10-mF capacitor, and a 0.45-H inductoa u8zmh 2+9vlur, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500- 7zd*8c*aezq+jma b*l W resistor for a phase angle of zzl* c*e*a+ aqmb7d8j$40^{\circ}$ 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-mHdx7)mfqz+ e2u;n/s e j, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sou/;qsuex )nmd2f+z 7jerce?

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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 with 12.0 W resistance, 15.0)lurp fjko r9.*b3kd( W inductive reactance, and 10.0 W capacitive reactance, when t.ok( rdp 3k9u)jl*rfbhe 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 circuit isedc3o7db4 dd ) $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 7mnw vxj z(x :-zp i4e6mb,d2vW and a resistance of 30 W. What is the power factorz4xie6w p vnv2x:d- b7( zm,jm?

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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,smoq ohe 131x;x3,tdf a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?;q3eos hmo1tx,x 1f d3

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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 capacibwux d xck7s/il*5a; .)ok1aw tor and a 15-mH coil in series?buxw5 k1/cla;7.* kos a)idxw

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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 qv;bl0 *s h)ob 3v.p2rgayl ,dl9x va;series with a 4.7-mF capacitor for a resonant frequency of 10bv;0boh al 3 ;.rd2vv* ,sqlg l)yx9ap 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 series with a 3.7-mH inductor for a resonant frads pevn xjn. v74(h:(lg6q+e eque6a (en7ve.h+n xqpsg(jv 4 :ldncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resish+hb v +frer(*75 qxfrtor and a 40-mH coil if the resonant frequency of the circuit f*hhq7+r( v r5xf rb+eis to be 1000 Hz?

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