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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 magnetic flux excepk evu*0/f m*ltda9e o8t

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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 stfwf/.4gx+ sf xates 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 produces wha0n,/kn ir:gk bt kind of change on the induce 0,knri bk:/gnd $emf$, 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 prw- xyta) 7c a80adtc4coduces what kind of change on the induc7-cxcawcat4y0 8d at)ed $emf$, 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 ontgc 6gheb2 -k7 the induc ge27c6 gbt-khed $emf$, 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 mdt4(g6xu q8xy agnetic 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, qy; st /y2,wihthe direction of an induced current in a conductor will be th;t2/sy,i wyq hat 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 horizony b v6x4y.eo:vtal table. A bar magnet is held above its center with its north pole pointing down. The station e4:o.vxy6b vyary 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 flau2 +sr gi3(tf y)5vwsca ww:p*t on a horizontal table. A bar magnet is held above its ceww*i2yu:vct3(f r +ss5awpg) nter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region i c4ncwe6(f 0n2omsxtrw*m0) where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the x0o( sm46wrn* 2)fntwe 0cciminduced 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 levelkc9lzz.7 3+ .doa9bxd;yqeaa table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current io dqz .3yzbl7c9 k.ax9d;a+ean 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 t )y16y;h w vc j4bmtu;jhqw,f)j6 hjj;he magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above,fw m 4 ;h6,yt;jj jhjcw)1vb;qu)y6jh 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 li zdniq; 8wmcy)57s cb/.9wwtp es on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the iqw .ny8d;t si57p)c /wbmzw c9nduced 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 withewb uih8 -::11plqqjz vdq6ip8wd8 f3 the north pole entering first. As the d3:ez6d:wqq w8h ibp8pq fjv18i lu -1north 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 ps;pmj3wx 5xuh- t17urotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatious1u;wxpj5 px-mt 73 hn 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 at constant angular speed about 3 j+rynf1 s;i1ov 1wccahuj13an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the13 fh;n+ cusw3ayj 1i vcro11j 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.l64jl1en x qca lemjv9-9hb, 2 fvx8a6
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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 t9sd6 ; 2zjyu twdp1ek*hat 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 magnetik .f as3r,os7hc field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in 6n/,xnw f/qh18srh mbthe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement conceqnhm 6sn h/ /8wrxf,b1rning 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 r4t583 x.jibko4 +gduzlm 5yjpotates 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 tr rf7rhg63)q nfansforms

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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 frequefm q+n*r (,xldfeg2 mwcm+ww y/ 2,vyy-unj:,ncy of the w(myqnxc v, y2fg+/*,wjw d e-yrf2lm:um+n,$emf$ 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 us.fj0rh su *k;tbver dv(18jw,ed 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 kp77:m8 wc cyp h2i)hy*j5yt 3ejk0doce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary cooszfguuj l-iv5fz;6f4( v 7 33cnu jo8il contains more loops than the primary coil then75 3ov-u c3zu8ff ul4f 6vjnsz(i; goj 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 cfqqa30b3lb6snnhj b:d2 /w a .ontains more loops than the secondary coil then it is jqs2l fbq.0dn3 36 /nh:awbbaa

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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/- btmlen8 xdtmh:7i m6-juyx v.o ,g) 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 resonatb i5))ggw o.imx5 nn7nt 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 indux :xse* ;:v4sr6:bfyh0 pxkg 3cf9 kdector are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, th* vpb: 09x;yrx6f4 kkdgses3ex f:hc: e 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 inducbu6t2b 4 +9t2zymtafdtor are connected in series to an ideal battery of constant terminal vozb2tdymtt 9 264u+abfltage. 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 an0cwol3 kj 6.wpje4ut4 9sp(ys d resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with indaa gw 0,thmr9 g ud,dnj2 4zyw-)8h3quuctance 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 to x szso-tr90 (.vl zsg1lj/, foa battery. The time constant forj srz.s ltlv /x-o of1g,0sz(9 the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induct,uf/zz eqcs,4vp 0ts9 or are connected 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 currenes9/t4 fqz,,zvspu0c t 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 a-ua3d d; u)boexcept:

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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 t3ckxdd +e/p6lhis 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 connectedv zu3x-5f.n kr to an AC power supply. In this circuit, the currentrznxu5-3 kf v.

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when thglx03y1mjkt:4 g0ub b e frequency is tripx bk4b0mgy lt:1g03juled?

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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 i.vwf c)aovqa/ 0m8t-efm7:t,.d dm5u1 cmz vgs doubled, the inductive r 5-m/ gmmfvca7.ctd ,dvz1woqf8 v 0u:m.a et)eactance 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 .kxnbtmhf01 f s9c2e5approaches zero, the inductive reactance of that cox9c f sbe tk0m12.5hnfil

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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 powe d,,j7pw1 i8 zlxa8jhbr supply. In this circuit, the curreniw jpa,8xdj z,8h l1b7t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i3mbcyov 1weo3t a,r --n an ac circuit changes by what factor when the frequency io rvb 3 yw--m3t,ce1oas tripled?

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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 zero, the ca 1 9ffg2t/+z+mdlgoj7t f,ab/1gye enpacitive reactance of that e gmge+yn1/ 9fg 72ojzlattd+b/ff1 , 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 indu)h)y (ycuny0u0kfjv: + sk5 eoctor and capacitor in a RLC series ci)(0y fsh+uo k 0jkcyuv:)yen 5rcuit?

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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,uas3 y 8tdauzt :v9m8 RLC circuit 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 in(s dsikis:bi: cno1ke/df.i9, t24 olcreases. Whekcik.i n9i4tb sf(2 oid,leod/ 1s:s:n 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 i;yxc+f3u n4dudvf 6a) mpedance 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. mu1wkog ; xq l9mb,8aa)z62uoThe 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 doublenx*s9 w.8 6jmrftxr j1 in an LRC series circuit, the reson 1t6njm*wxj.xfrs89 rant frequency 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 appli+xnq)3d5llyb-gcy 8 ged 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 serie: 6d,yrvoe;di- 8oc ees RLC 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 0.10 m is rotating in a uniform magnetic ffo2tnrh1 d/ y+ooj 3wxa9k5- zield of 0.20 T. Find the maoow/ryf -xhak n9to5j 1dz +32gnetic 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 a uniform magnetic fiel /s +0 2z:o**m oi dtuby;kvcc/er*jild of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are p2bo /y ;svd *iez0k +i* l:ju*otmccr/erpendicular.

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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 reish -qpynv 0d5,w t /ii6q(g;adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t s-niwd t0(qeh;i,p/ 6viq 5yghe 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 loopk*2xk3h c8s+ n* udgov 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 coikc ;czu x7w,v8l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with side.vg+ikyv/b fh:fqi 5 caz-(:fs 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the fvbh -f5v.f:kig(:c+ i yzq/aaverage value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of24 6tl l8gdzyo s;xc/u $0.40 \; m^{2}$ 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 areazl+ mk/po rng9v1;o2c $0.20 \; m^{2}$ 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 z:;vcmfzv )hz0qd i0qw+:ka43zn /cx horizontally at a location where the downward component of the Earth's magnetic field is vmc;q q znwaih/c 0fd4 :)vz0zzk:x3+$6.0 \times 10^{-5} \; T$. 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 constanj,jnwk pm, 5in5hp,vx 9 gd43ut angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in ajd unvhi53pjk4ng wm,p ,x95 , 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-sx i-4h* q s*hhoiqp;7yectional 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 ofs s6 /lg:zo2pv lh;kl+ 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 rectydn.*6g 7g99on ohsoi angular 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 rotatiooh9d gn niyg6.os97o*n, 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 oqzqde0 g1:s3fuc:;p j f 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 p738ndygah0 v *jg;k lz(5 alun.x5huconstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If thex*jlag 7 n ydn;h38a.hu5kpvul 50z (g 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 9zi; :kjy2xq+yht7xt4 +q rm cwith 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 motozx;m,pq;t f,q r have 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 rz3y -f95+7+bh gozdpyrgk f, vesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it zp ykgrf yzv359fd 7 +h,g+bo-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 W4p*oh 1 ap,5urvhiwso+u1bx4 is connected to a 24-V power supply. The operating curreop*4iu sh u wh4 ar+xo151b,vpnt 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 h hx1;biaj-+s(zikme 488 kur6.0 W is connected to a 24-V power supply. Th +uhmkr;bis h4zj(x8-1 e8kiae operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a1pr 16u/dhq/tx0l edix.x s)i 24-V power supply. The operating curren6 st.)i/1d qh x1xixlreud/0pt 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 isv08j1vsz+ )gkdrv2 rb needed 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 flo ,5yn0os6kksc ila,i;4c v: ihw in the secondary. How mcckn i v,l; io0,6kh4 sis:ay5any 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 ar8 mi qc9vd- szh.-9 zcsdqr9i+e necessary in a 110-V primary if the 24-V ses-8cm-qzvqsh .9+c iz9i rdd9condary 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 2000-t-ztc3d33,cu6 p /bsao 1agk ahurn secondary coil. If the current in the sech kds/u3-a36c,o p31atbz ag condary 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 th ;sxmdr //8 dpz60ykrlob*0wl8 smv/ue primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in 6zpb x*l d y/;muvor/l8/wm0sdk 0rs8the 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 10.0 00jll+i (clc emA. The primary coil opl 0ecic(+j 0llerates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tugg,3exyims)m1y , w p0rns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarx gm1g0i 3p)m,yyswe, y?

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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 itekhr8) g8h,ys.fo( gskkq :rx*3 0bk 7mpjik:s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedfg.he8os* q:k3:(k 7xpk kjk ,)yrrmi b 80ghs to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer h e ( *sd th4u)9asjkcdglsa(14as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seconhk*(cs4des(l 9sa j1a4gt u)ddary 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 secondaz ,v7ns bht c,3*l8bgwry has 200 turns. If the input voltage to the primary is 100 V, we can expect the outp *,3ngws,v8bl ztbh7 cut 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 10.s:ipgrh-h8 l0 turns and its secondary has 200 turns. If the power input to the primary is 100rhl8shi . -:gp 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. The voltage is usually stw,viw-rn48fpa:(--y p mlnr+e fee j 9epped up to 4500 V by a transformer and transmitted through a power line of total resis lfw- r(a+4: wn epjrepe-ynv89,im -ftance 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. The voltage is usually ste*c7hq qm *mf/cz5:es b2q8ha npped 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 mq 5 h:*8h bs/qe2zfaqm cnc*7the 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 vol-kqqfy o 98ruul)*rs ;tage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not step8*q r;l-rs)ofkuy 9q uped 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 hjqoxkwy*t;1q bcswx5 e+6 grepd -.-i3t,d ( 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 of6ie.-xw5eo+3k xq-1 hjw pt;cdgy*tq b,dr(s 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 9mvk/1weplfsf ur0.9+ t z7wo 50 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 lost wkpfze1tu97o rwvw /m l0sf+ .9hen 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 l(uy)btnfj-y- / 4rvuress power would be lost if the power were transmitted at 3000 V inst-vb (r nt-u y/4r)ufjyead 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 g amzqmd1 1f w0rey42/440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To wh fw1rq1m 2emyda0/4z gat 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 vra*rwv9 +n:ka current of 5.0 A. How much energy is stored in the coil's magnetn r+9vkr*awv:ic 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 a8 v)cr5 izs ui8oe*v6pnd an 18-H inductor. What is this circuit's tz8 6vu c 8s*i)pi5roveime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 u3x 3vpm.7m rkV?

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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 thu o2vk;8hws1nflsy 9ks5 rp: *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 inzhm+8v7 2 ukosto a 120-V AC outlet. What is the resistance of the lamp hs+7v8uk 2omz?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is lhs 7rjk x0v2;;9demx the peak current thxh s7l9kvr2de; mxj ;0rough 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 gjoc 8 n ag2znct;1(8iac power supply. What is the power diss;8icn8z1 cgng2j ot(aipated 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 res :uxg)(qpb1:fqu-k+j,xhei) evc 7 cvistor 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-Wi hx: js14 ewqw5,mei6 resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistopqy hth5zo6n4 ;m0 vc)r is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H:lbstrmacw(479x t/r z?

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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 100dpnjn//xc- : s0 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 1:f- ke6h199 sjm hungqqya- n64.0-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 ot id/)syevz ko)86ln s0d0aw.f inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mtmr1sdks-,u 5j *-xar.b.ypc H inductor when 120 V AC at a frequency of 20 kHz is appliyj-um.xtsb1* pa ,dc-5 s.k rred 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 2.506/ybqar 3p0 iys.v*i ub 4v(bj-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 reactanceo oj+ueatj /t7x- gmp*2+p3qs of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive rezno u.mof6303t2(wy un .qrgaactance 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-m)y njvmt: .n:62l saifF 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 wilt0z w *g8mi5xu9d md9. fzk1val the capacitive reactance of a 0.010-mF capacitor be 100 Wwzd09a fukvm1td8* gm.iz95x?

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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 1ma/hl j8 2ma6c000 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*56 rkgkdf,gm series circuit with 12.0 W resistance, 15.0 W inductive rkkm5f, dgg*r 6eactance, and 10.0 W 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 impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-m,03 bjrmc)r imF capaci0j m,r3m)bcr itor 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 150wq02wo7 0nv.h 8xxp 8ukoa,s 6fm b q.kgq9r.g0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca0.9v,k.6sgh prqowob7 x f w.q8nm0x8qauk g2pacitor are 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 ihxzr a)4qj 3p0n series with a 20-mH inductor, what is the impez)34rhj 0 apxqdance at 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 idbou j4 8ocl)4s the phase angle db4j)l4oc8 uo 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 ci(+s xs ymeffb/ +bn9pzh*l)mtf+ u5v (rcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500suxfh(ym fn+ tf5m+b9pb() /+*s zevl 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 withwe7.fpba vld x; a.57k 6v*sjgml0 8ja a 100-W resistor and 15-mH coil to get a total impedance o67dga 0a8w;7 abpm . x5jev.sv*lkfljf 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 in serie; mz0itj 0rfrn815 tsks with a 450-mH inductor at 5000 Hz for a total impedance of 4ztsmfnr j00;ki51 8t r0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a 7qflpy/ re/rwcv i*-7 a4 51y zuydbld-*g4u wtotal impedance -raf5l-ydvz lw/y/ 4 d ywr u*u74bq7*igpc1e 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 +t,g7qj p:r2u eamecg: f.zq320-mF capacitor. What is the impedance atacjq2t3:zme,f:gq. 7er +gu p 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 capacnbuvmub i5 ztt:4v2nm8em/oz:/ a9f 9itor at 1.0 kHz for a total 8bm iaef:45u9/mv/m ztn ovb:n u92ztimpedance 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 serie tlcoo9qk.dt6vb/ z 3apg ::z9s with a 10-mF capacitor at 1.0 kHz for a phase ant v dzkq c3.p/:l 6:o9aoz9gtbgle 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 30iigc v)edo+8,juy*4 rj6h w)r-W resistor at 1.0 kHz for a total impedanrh )j* ojiguy+6 8ierwdvc 4,)ce 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 a-hrf2 so1:3jx x4yih7kwv1 nqt 120 Hz. What is the phase w3-ry vni q 1xjx 7:2hohfsk14angle?

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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 resis3un0) 7j mjq8 dvnphyws+tb10tor, 20-mH coil, and 1.0-jsm3 0yq bh8 jt7un)d+w01pvnmF capacitor 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, a 10.0-mF capaciup;c;.94ltc toba lm:ma -m; stor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cs muca; ;bcm lt.9;- t4amlo:purrent 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 0-8 n sk jj97;zteyfar 0t5c.jwnizn 2capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in-y.z8 9nst0jjr5ikf a2 w;0 c7 jnzetn 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 ser0h0trs1 ebk5 ba::dik ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectkh sa:50:1dirte b0kbed 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 necessaryaj.d/4uynfx maqcu8u:)e,c/ in series with a 500-W resistor for a phase angle oux :a)q j,m48 nu/cu.c/fyea df $40^{\circ}$ 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 ed7fs+n*8mdc = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fromd7f *s8enmc+d 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 w+k7b 9,xrjcz5i7sul in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sucrl 9i7+b7j5w x,u zkspply?

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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 i.x6hc(nt;;.plhcnc j s $63^{\circ}$. 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 resistance o(d emo q2b d4,7w5dx qc0fry:lf 30 W. What is the power eqdc(bxlo 45d, 7rw:yd f 0mq2factor?

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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 re wp+mn9p3 w5 wcc.r4c 8xbein;sistor, a 10-mF capacitor, and a 0.45-Hxri9;ep+c 53 wn.n bp 8c4mwcw inductor, 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 avj jqlm+k,97h4*lumq2e d3 x tdc,8vdnd a 15-mH coil in series? j,+h2qd4qtlcu*l9m vk7xme3dv, 8j d

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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 capacitori loj-*v ftah 9j8*rz9as l.;c for a resonant frequency of 10 kHz?j*j .-;iltza clsfo98 v *r9ha

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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 seriesbtj9;o0 -f)dd)or arn with a 3.7-mH inductor for a resonant frequency of -doo0r tj;fa9 ))rdnb 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 witha ,cb.qw lnuo;jn3.d6 a 30-W resistor and a 40-mH coil if the resonant frequecdun.b ;3wl q. jan,o6ncy of the circuit is to be 1000 Hz?

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