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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of mv:0esh e2lg)et lr+ h(agnetic 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 a g5ayfchk2fi .+pu:8$emf$ 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 of7mpxqyvr8;+ s4u+xt4v gi -ti wire in a coil produces what kind of change on the inq+yt -4 gx+ii7vu8 v;rsmx4t pduced $emf$, 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 lot w0vwy4dt4(cop of wire produces what kind of change on the ind40 wctdvy4t(w uced $emf$, 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-s nijz4 7moqzi6*k*i what kind of change on the inducedi mo-iiq 4*zj7sn z*6k $emf$, 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 3u zj,(guzs7h 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 in cod5xba3zyzfi8z9- z4 2e 4xvduced current in a conductor will b z-4dac z8 94v 2xyz3fioxeb5ze that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar yt ,hk c:ci9m/2tvach/x1h eefhi- g zr)/(e 8magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed frfx eckea,i 2tzryc /tg/h1(i:ec9h/mh 8 hv)-om 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 magnez(cug15gz:l/ wikgo4t is held above its center with its north pole pczz1:/oi 4 gguw(l5 gkointing 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 region where the magnetic field vector poi5lv/ 2*v*(axxv zkioxnts straight up. The magnetic field vanishes suddenlyiaxxv (/vk2zl5o*vx*. 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 ec2l b906ecjccw,dub/u *m+ +vd m6x9 s(jrz zthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the w+jmsz e ux(9 ccvbumbjl9 e0d6 d,r/+z*cc62induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thewkh9e eak1gobla o+g5 d4) 3a /1vil:e magnetic field points straight down. The magnetic field disappears suddenly. When ) eldko1a4vg9a l/3w1b5hg keoai+e: viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing n ,z ngqj8 :*g6ans,wn 2vtwc8current northward. Two coils of wire lie flat on the table, one on either side of the8qz :cgast ,jww8n2g*nnnv ,6 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. ) +ir,miuw/quAs the north pole enters the wire,w, /rq +iium)u 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 s,dz/w tp-lv 2at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of r-,/wt2svpzl d otation 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 rotagn(kcfn 89 x(7sqxzd)ted at constant angular speed about an axis whose direction can be varied. In a region where a unifornxdk9(nz8c)g7f q xs( m magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.mf3ec m63+l zu
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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 thataxjg w s02j:r1bo1z jq 3jn69m 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 f0dafjl ck//9wjyy 8 n:ield. 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 (orienb k e :va0.fyl*ige3m:jpnv; *ted in the east-west direction) is moved northward at constant vele: bykvan;l g*:ep0* fmi 3.vjocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocivr:p(iv-.ms 6zxw rh/ty $\omega$ 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 transz 49 ld:-y,5)u(mguukpj rax uforms

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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 remw uk1qv92 u/fvolutions each second. The frequency of thefw qmkv9 uu21/ $emf$ 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 use-plq4 t/d w;nmd 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 devi(cebek*(-y1sy xd,:t)np5s hn x7bv nce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifj:dq3+o+qjv 3-5otyi a g: aun the secondary coil contains more loops than the primary coil then it+dn5-itva :ayug3 +q:3q ojoj is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loo5ift+9 wrpt2x l ehy2)g1 ea0fps than the secondary coil5f 2y9eagx)it p f1welht02+r then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powci7xyfhr aj7qph*f(72+,r yx qpe+9n nkf1q3 er 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,o*id81,lq udaxpe*.c

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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 inducto5t9 / vrltg her) ppmbj9j(2er*sxl+3 r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltar /( *3p2 lv bp9)hex9mrtjrlgj+set5 ge across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery oa +xi -spp(5svf constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducssp ( i5+axpv-tor 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 m1a6n 5m .,h.tb u2vizoqu:ch 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 i++ydw2y vbfggs/2eg 8 lb tt/- h6djj;nductance 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 sepzewypl u.3q6b3h.pf -b0ey6ries to a battery. The time constant for the circuit represents the time requiredezphwp.yby -p .03qbe 6u63lf 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 s r:46; rmcwykheries to a battery. The battery is suddenly removed from the circuit. The timr;yrh4:6 m kwce 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 units except:puj *zoty+/9fk9 /xg q

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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 ;m:q2bki,u 4mrb9 vgbsupply. 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 c zg(ro3r2 8j;jur8qpionnected to an AC power supply. In this circuit, the current3 o 2j8jr( rurip;gzq8

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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 acod w /fivh6,em+i )lz- circuit changes by what factor when the frequency is z ,wv ie hdf/m)6-loi+tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of agyf 34xta2j 3the AC voltage across an inductor is doubled, the inductive reactance4jty3a fa 23gx 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 acropr( zixt d4zjs puj80u86)n2zu0z,aiss an inductor approaches zero, the inductive reactance of th d4j sp0u) i6p(zxuntr8i az,ujzz820at 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 cur+(nm3f osrak+rer(3so+mnf ak+nt

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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 acxdq yu5l )tsxq(u76.t circuit changes by what factor when the frequency is triplduqt5.xqxu67s( l ) yted?

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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 c n1sz*7f jk ./uexb.t)cnm 3qrapacitor approaches zero, the capacitive reactance of that cap.k1 *j/z nbsx n)e7 fmqrtu.3cacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a 54vqjr 3q )lx;(fgy4yl/q gajo yk:2sRLC sv5f ;qyks)x 3jyl j:gro4l2q y(aq4g/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 c- vksp u7ph.,y 0zvmw+ircuit 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 circuit. The impedance of the circuit increases if R inx r5 5qoc0pl*ws r8p)ccreases. When5 clp5 *)rr cpqs08wxo 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 circuit increases if kmw hw*u-i(e3$X_L$ 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 seri6mp v**s 7p :c7ujmctam.ruhtu 3s o+:es circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit3f1hku* c6 qps, the resonant frequenspc qk6*1h 3ufcy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied n4/cjz yf9bwzr, 5rwz:9 p3 jzvoltage. 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 xmy+mzpf1 e, 0+*kba cRLC circuit 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 0.99gda* 0n pcpi10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop g9cdp*a9 np 0iwhen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform.obn0jd 0-)0q jmu8tjahdh2bq +hm4 wklkp +5 magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and hkjw8boh .5jq jnluk d0m b2)-p+ ad 0qht+40mthe magnetic 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 magnetalfv+t 2bb -y,ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arb ayl,t+2bv-f e 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 loop is reducedul q zbzqs*0:( 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 chan3ihs 1ffmyzh8 .a ;cx1ges 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 woh5i 2wm uklf;,+gxc 20umaqe4 *,rrdith sides 18 cm. A uniform magnetic field is appliedw,oc x lm,igahmf2 rr2ue4k+q05;u d* 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 15h.mtvvqxd ; 55 turns 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 aqr9tyc 6f :)rorea $0.20 \; m^{2}$ 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 seh,x-li6v c9lpan of 60 m flies horizontally at a location where the downward component of the Ea ,9v6h-lelxc irth'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 barx)6qnipp5 m;a that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis througqan)i x56pm;ph 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 loops and a cross-sectionaos , aul+mt)e0t1kf4 rl 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.1f/p d) akbbd 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 rectangult */6tik34sy zr,ibb;n b6vplsk3w j/ar 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.3wik/k*ir s6 b 6 b4zy /tl3pv;n,jtsb If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists/qf37eb0 *u ;qejsep+ffss 9 n 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 /8pz i4*rq lnfAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetzf84qpri*nl/ ic 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 ( awk*pxzs9:j a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mo/ jojkfa yr7qycm i dgq-+(*d 6b+))kctor 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 resbmzagv17 b07eh .2baqistance of 6.00 W. The motor operates on 12hzg 701b2q .avmb7abe0 V AC, 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 is connected t zhcq-s,k5qqg 9nk2o;o a 24-V power supply. The operating -qc kh9q;n5, zgksoq2current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppld ld1bu,( eda-y. The ope,bdedu ad (1l-rating 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 c3l zkkzr6u 33fonnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thek lzk6u3z3r3f 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 nee)9o q72l44p apj66adkqfad ptded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fa) phy*c4,puwm1pdd ) low in the secondary. How many turnmw*cdy)u , p1adp)h4ps 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 pvnfc5h:hb*4 a 110-V primary if the 24-V sech4pv5chn:f* b ondary 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 lwz9h gmv-2r ssie6:1-u rm,ka 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current inkl 1,wuhs-izr-s mre :6vgm 92 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. Ass ctmo tp)*s 1s:oxeavwgs:-5(uming 100% efficiency, how many amp-(avw1:m ge) cooxs* tsps:5t s 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 7500 ki0np4q+xgdt 2f i7jh7 mhnkx6/11 kxV at 10.0 mA. The primary coil operates on 120 V. What does thknp 7/hjxt70kxgif4 +6kd iq1hx1mn2e 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 tugv f;9gt9 o3f6g,eblzms) z 6wrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to9 3,bzvlofgw)9tgs;g m66ze f the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary colru/, xw0xo sqa 02*snil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curren0rxs sq2uaw,lx* o/0nt 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 uk s1*rzsp,l/q 16 wzx100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpu/kl1wps,qu1* 6 z sxzrt 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 seco w :*gd8;s js*jeegdl7ndary has 200 turns. If the input voltage*;7jg8gs* w:ddlejes to the primary is 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 transformer has 100 turns and its secondary ,cxkqv v,f* qlk wf+v2p:b a: u75ttl+has 200 turns. If the power input to the primary is t:k cv +xl,kqf fqlt*wp:2va,b5vu+7 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. nf z:i/d 2r/eu The voltage is usually stepped up to 4500 V by a transformer and transmitted through a po zdf/n/reiu2 :wer line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thq.+h)p.8 m*o s pemn pp.mgho9cl)u3p e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powerposnh mp9uqp..ohl+*c8)g.pp mm )3 e 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 12jwd8f a0 w,8+ bpq, plr-fgm5x0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the axmd5- 8r lpb0p qwfwj+g,f,8transmission 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 re o frr1lhf,*fv3ydfp0a6 8q(asistance 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,af*flf03vo6 8hrqdryp 1 (f a a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 5q/dud 95*lspx-y .jhx0 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 trshqd/*yxuj d.5xp-9 lansmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less ;z) e3zg0vm3- oayy sjpower would be lost if thsz 0;yoga-) v3e3zyjme power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lin(pn se7ihzzz( 4*vwi+e with resistance of 0wvs z(4+zh(z n7epi*i.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 coi2it43 ;9ka zc1 hndbtfl1(nn ll's magnelnl49;n ct k1tf1dzbn32a hi( tic 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 inductorh m0b7z-jq5 ga. What is this circuit' aqb-57mj z0ghs time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ci5 xseaz)c3*edqzz 5l 9s/1o cnrcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. y+: mu3ah1uogld ut 22 What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resis2ereg )yrxq i3g3q+1atance of the lampgq+x3 ri )3e2 eqargy1?

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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 12:ihdc-.3s+f uo;oii*u - .vb4cju sqw 0-V ac power supply. What is the peak currentwu- 4u;icu vi.so-c:.hdf +bsj io *3q through 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 connected to a 120-V ac power supply. What ish 3 c6k*ll1p ar,:bvjx the power dissipated in the resl b x3hpar,6:lk1jc* vistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is y/prt nizl k8o7c8/;l$I = 0.80 \sin (240 t)$. 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 resih tt jpbaw/l k*;9/y1e-1kjyc stor 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-W4shbp g-g +y0cdb x)y7 resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance m ikl a7 vv-anluu+q7.wolg:u,q/p .5of 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 Hz?j f76wnk2brs;

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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 ., edyodqnr0 nr0 lo2r. v0:mb14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a :lp2i t/:n rmg 1agd;6k7rdkqkcl(8oc2 na/jt 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 6tn klmasr ;n1oz;./(t0-mH inductor when 120 V AC at a frequency of 20 kHz is t(1.rzalnns;/ ko;mt 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 colx (b1 /;tjwfdil 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 of a 4.7-mF cahmdruxlyb - a6vh;;;7pacitor 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 a67;uk i dpl2b 4 ky6hwnmw-c9needed 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 a reactance (;kp7 cvk(ap 38aajzy 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 capacitofk(asi sk k*:0r be 100 W?k0 fa(s k:s*ik

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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 h9tng:+5jxp ncx sw b)j+ 4cvn-yd00s 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 12.0 W resi1n dbxalzvw86t 1e8,z)hd.ed4p4klw stance, 15.0 W inductive reactance, and 10.0 , 1.b6wkhvep 44wz1d tadnezl)8l8 dxW capacitive 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 im8i zr,,qd m72 u0q*ptqebgez)pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capqu8,0gb7z e zdqq)*2r,ei tmpacitor 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, /qzd;tdvt 2 cf tu8 rb;bs,+4/i7pyth20-mH coil, and 1.0-mF capacitor a,z8btrc;/tu7y tb/2 d t di+qv4phf ;sre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wfu5ahub+w7 t8 4;8m0 qj eumyzs9 q5gdhat is the impedance az5b5qfu480 usweq gmy+t 9h8 ma du;7jt 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 ifs1q nbx8az.ymi.xd -3cw i+ 5s the phase angle a+a zqd.8 31iw.bfx5yc-mnix st 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 needcz ;)v.qz/6 gsnf h2j:ahsf/s ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W.hfj;s /nsa /62:g sz fq)hcvz 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 capacitancep/jj3+k pxg 3xs is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz +33xpp k/gjxj?

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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 )2:9a it)kj k ,iwfh1 p4mzoka/xt0t lput in series with a 450-mH inductor at 5000 Hz for a totp/kt im)tja42kx t),9alo zw 0hfik1: al impedance 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 ajbop) 4 ;7 mqjdopt:i)r- 8yku;o+mct 100-kW resistor at 1.0-MHz for a total impedano 4jotr:;;db +8oc7uqyt p)p )i- jkmmce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacito,bah g hc r,-pju ouy7by.,24kr. What is the impedance at 1000 bp gucr2y.uy,4j7 -bo h ,kha,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 kHz for a totve 6t jrv5;hp9pdw :k1al imp6;et5kjv :p9vph rwd1edance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seri),u*vjgh1m ydr z 3y4res with a 10-mF capacitor at 1.0 kHz for a phase ar*u )v 3r,h d1gymyzj4ngle 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 resistor at 1 *ap: xnqrfl-0p zt+y1.0 kHz for a total impedance of+-yrxp l:* 1qtzp0anf 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 s1d(t/n jn*y+ mtb1nzphase anglenzm tys+1(jt1nb/n* d?

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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, 2c urtdwdege1m0y o7,5-xd k4 30-mH coil, and 1.0-mF capacitor arey0k,mu7 e 4 -wc5xo3rdtdd1ge 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, a7ijbb7jwh* 0+6znplg 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whath760jjwl *g zpibbn7+ 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 rea;rrp nc;zr z4 x)l6+yrctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power r yrzn )rrpxl;;c46z+ 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 serih* -s*3n9 r rwu/t10g uvazmdles RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p* nwvt*u1z l3r-md0hrua9 sg/ower 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 resistor for b3:gblm5hwpy,t11c7 4j/c jlv l p5aja phase angle ob 3ml1j,j tw pyh5vl47:jpa/ 1cglc5bf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 9.d vsckh cv5210.0 mF. At what frequency should the circuit be driveckdv5v.9 c2hs n in order to 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 circuit with 12.0 W reso a; yb:)bv1 puu/t5stfu.v5fistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit y);uv fuo/abt pf:ust1.5v5b 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 ci*tr 0qufyi, cl.eose4et 7;p)rcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistancwxkq t5, 7n2h40f3bgif e2awhe of 30 W. What is the power fact h5g27wwf043ah x ft2iqenk,b or?

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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, 9rlf 7;(tzvq bm8qn/ z q*20jbb h1iwfa 10-mF capacitor, and a 0.45-H inductzwfvbr/0(b bi72 qnqmz *lq ;h f819jtor, 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 frequency of a 1.0-mF capacitor and a 15-mH coil ine kb7a fb)g-tq/k8 ,vlra:*v c series?) :kq-b ctr, /vvak*labge8f7

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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 resonant freq6nbmx30maa1 flh -8ruuency ofa86b 0axrmh-n lmu1 3f 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 series with a 3.7-mH inductor for a nf .5 w-r,.vpk9cl blp*lwk)fresonant frequekkrbl,pp59c)f l *. nw.wv- lfncy 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 i /ejgl9t 3kd9,p7hfmseries with a 30-W resistor and a 40-mH coil if the resonant f efm,73i 9 tgl9dpjk/hrequency of the circuit is to be 1000 Hz?

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