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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 unyyu :0y mx5nw4k;* tqeits 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 st14gtyn*qazui i7ej 9c6/ hbs*ates 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 opdom36rio +. . bo-sbof loops of wire in a coil produces what kind of change on the induced ds i.bo 6+o-o .or3bmp$emf$, 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 fi p-r5gdx t:.qdeld through a loop of wire produces what ki5dgqd:p xt -r.nd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire producjdjy/cd372g n, s 9 xmwtgswek 6j/*0ies what kind of change on the indug sgin yjj2j93ektd76 ,cw0d/m* xsw /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 : m kme5*e zz3.pqhyp ;ia7g3xfrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced currenmz 82nkot1nb6 t in a conductor will be thkm2tnz n8 1bo6at 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 horizoegph y2 h:v;/sntal table. A bar magnet is held above its center with its north pole pointing do2ys/; h gph:evwn. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. ctc-.vaae+ xyjd 2p(0 ::waun A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fro a(en:.jxu 0c wyc+2a: apt-dvm 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 magneticy9 gxlyi 28uv; field vector points straight up. The magnetic field vanisyxg9vyl 82 ;uihes suddenly. 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 lgbe0s6xt y 3 bsrp5ma.qp )o-;evel 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 indpt x sbe;g3mp 60y.-r)5as qbouced 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 mmw ;d/ru0c2;ew5ppf region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fromw p;w;u0 c 5mpe/drm2f 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 liesbnv,pd;yi zn;ujp(pf/,gy6 e 8vne )*2 2m gji on a horizontal table and carries an ever-increasing current northward. Two coils of wire;*6;bnpfdgjn/ y)gjn2u2 p i8viv,,p yez(m e 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 fi/ poau4u gi-sps,,97p vri+ww rst. As the north pole enters uspa-gw+4s9pwup, iri,/v7o the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at copcu aez )j0k/ui)6 8uqnstant 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 thp6qe)kz / u)0u8uicja e 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 wirevjmpvk(2v11k ua k7x3 is rotated 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 orientation of the loop's axis of rotv1kj 13kx k7 2uvmva(pation 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.n67.r kjaukz -
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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 th8/:+st nq xaxx sp-p-55lnynh at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The kcr-f o86csu/tv7w0r $emf$ 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 th nl49vddxn. ):*stz (cmrm;wz e east-west direction) is moved northward at constant velocity throughnvm: .4(zsxzn wdd 9 cr*)mt;l 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 constanqaausd 0 hjfy+f +0z;q-.waajn509yw t 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 trai7 gbx f-g ph*a-i/6r gsfaw+1nsforms

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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 60rtj8k .jbp3c 7 revolutions each second. The frequency of the c. bktr j8pj73$emf$ 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 deng (a xpky qto;dw:7 lik rq1.266e9phvice used 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 dev/e2i2 (zf ntvmice 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 coil contains more loops than tb h(bmp1 j,*gepq:n 5/ h1tipvqu. 4iuhe primary coil then it is am*t11 (piu.bgv,5ppb4 hue :/qhnij q

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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 cont st:udbx37 u3uains more loops than the secondary coil then it b:d3t3s 7xuuuis 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, thebg8c;g 1jsk/j3wmt .f 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.d -6alfx1a0i smjvi 3nt 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 oe ):p.wh.hvd6axb(o are connected in series to an ideal battery of constant terminal voltage. At the moment coo()pohh: w6 axe b.dv.ntact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are con q*7gefqju1 +6w8 ctkynected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery,1 7y 6+*8c kgefuqtwqj 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 Liw1m qe yyw3,cqj/e/ 6 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 inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and rda:b;.8moyoyw u 7;1lru wnr5esistance 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 connectef4 u) 5m5xvvurd in series to a battery. The time constant for the circuit represents the time requirx fv)u5vu5 m4red 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 r l0x9;t31ypk7dg :ur syetj5series to a battery. The battery is suddenly removed from the circuit. The time conu5l:gs 7dpt9k; rtxryjey0 13stant 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 hav s*zx309p:taek he)ro rqc9 eqsb67 :pe the same units 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, e.pm n063uy f bkw:n5cthe current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this chw1f ++9jagc.kl8 ekou 9h:yxircuit, the currentk99jgu ce1 f.okh++alyxw: h 8

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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 chan+ d;.mp+9to5engk8 w qrqy 0diges by what factor when the frequency is tripled?iq ;ne+. 5wd9tp+0d kgoqm8yr

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inducrl20+s vtfd+p+g 2hxytive reactance of that inducto+fs +ypg xht0lr2v2 +dr

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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 andn(k:wl br dyp*bf-67 inductor approaches zero, the inductiveldy -rbd 7(6kwnpb*:f 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 suppvb:y qx-4w65f15ke s9af dnl mly. In this circuit, the curreq9f ax:e5l-nsmy564b d kwv1fnt

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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 6)zxsmcl,khg*c8l v3the frequency is t*z)lmgs 368clxk,c vh ripled?

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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 t(jl: a h r8jpyq.bk7,; yhy2slhe AC voltage across a capacitor approaches zero, the capacitive reactance of ty hl hkjqy y:7s (8pj,b2r;a.lhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitorms1 : 3qjsasr +oia7;c in a RLC series circqa 7;r cmj: 3oass+is1uit?

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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 a x*mn +kopm.t78.qo9y3hjd3 h ursao/n 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 ut(k;6v x1we uo2cqlt f8brm ;+t4t;p of the circuit increases if R increases. Wheto;bct6 q ;8eut+;xr2f(w4 t mp1uvl kn 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 g5n6rav(omibk 2 7ho,4 s 4uqjthe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circc-z 1cgixhs+tb m+*v/uit 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 ;h u-v9 fyhc4)7 112 iyoty y;y(;u fmzdoqmmcdouble in an LRC series circuit, the resonant frequency of that circui-2f1(o 4;)oz hytuv;h 7c mydcqmf1m;i9 uyyyt 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 ishcu: :z-s zcy 5(1qkgn driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui pgzd5qwaln3 vqt;; 41t 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 unifef;5ji /esxn 2orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.2 jsie5f nex;/

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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 rotatfru5h g*yq0/pht1 x)+v(cctc c8 bn e9ing in a uniform magnetic field of 0.20 T. Find the magnetic flux ex p c8r*q)(c5cyc+9ttnf1ub0hhv /gthrough the loop when the plane of the loop and the 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 .6y1dwte mqnb818kgu uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whg1btyq d1u6km88.wneen the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable si p.gubyr *z2qys,x+v 2ngle 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 cqgdqkl0y 6+t,ob.c f31ns w4qoil 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 wibpm7-yef2 xaa+) 1fq+n7 cgaare on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value qa g ambn2 aa pf+7x7+1f)yc-eof 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 7jwfedp2 b /9o1 5,r3jdat aegwith 15 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 a aiu*9ml1puwe lc/;g/vb3i s,nd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a e)qq:j(mpg8 2 bll9b9q8eck* n wkt b)location where the downward component of the Earth's magnetic field is)qjbcp)8nb 2 tk:wl (q9ek qe9bglm8* $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velonjyo4c jio j7(x64b8hcity of 2.0 rad/s about a vertical axis through one of its en8i7j (oyj4xbhoc64j nds 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 lxjwd1n,1w gp ,a,n8oxoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consi)i(* i.ivmu pqsts 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 ar n1; p*- vt;ardsklsn9mature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long -r adnv; k;t1s*nlps9side. 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 consistsc/ hkfjffd 3p pc 2 )4t01mfgat1uj 896*qwxlv 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 *v5bjockr3)) t 9; rmyzjk3 g,wg8 klkgenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If jc,ogk; vjr)kk 5*gbzkw8)3r 3 ltmy9the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max40tqovm kk;h wni6;e x lr+1m9imum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oper55v l) 6szyddqates 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 )hnrh9. m:0(ffftgbcapi c 9; of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a 9 n;mhhfp9(ab g: ic)r.0ft fcback $emf$ 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 resia* na,cx5 g0qigzba,(stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What ii( * cg zaxqa5abg0,n,s 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 isl20mukq8k 2w v40w wba connected to a 24-V power supply. The operating current 80w0 2qu4b k v2kmalwwis 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 res 6 je ff4:0:wjmuan il-lfvi20istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is 0 eji:6- filmv4wf2ul 0f jn:athe 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 redu4:g*tws4u -s)fitlpfce 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 19(qis ox+ ws.n 8-zjyu4 A to flow in the secondaryo -isw qz.jy8(x9un s+. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 11177 c08t w;veqk tzebv0-V primary if the 24-V secondary has z0c7 8wvtbe1;tv 7 qek100 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 primagvw 6:ln7o zy;ry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wog6zvy n:l; 7what 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 primary of a transformer. Assuming 1,+zew,kc ukntra h8p +k6-q; o00% efficiency, how many amps at 24 V can flow in the secondwkh- uop;8a+n, kkct e6rq+ z,ary?

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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 provi46uh2 sroa vqo2x+n;kdes 7500 V at 10.0 mA. The primarxv2 u4o;2roskh6qan+ y coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary lb1 e1n7 s- i/gu;elpqcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is 1 e1g unb/-p7eql; lispresent 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 coil and 300 turns on 3: df+k fxzy2m so3nq+its secondary coil. If 120 V at 2.0 A is applied to the pri3+knfdmzqx+2yo: s3f mary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10 8tp j;ah9 *b;a+wnx am2nuyr30 turns and its secondary has 200 turns. If the input current at the primarj y 32a;p9a+;*8anhwt bmrxnuy 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 has 200 turns. I8**atsldg v/tf th dasv8lt/g* t*e input voltage 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 secondar+sq;:a8mk :n gacxd+fy has 200 turns. If the power input to thefa;mk+aqc n+d g8x::s primary is 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 /q(ixjo 7d2kz2bsaa 7V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.2xszj / diaqb2 ok(a77

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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 lss1 rq) x uxqfbgzh);7+ ,lfu u8zs*2usually stepped up to 4500 V by a transformer and transmitted throu l ul2u+)7xs18zzhsfbr*qsq, fx ug;)gh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is h,*arzy6xxn*fd eog-3 v4dww1l vm; ;usually stepped up to 4500 V by a transformer and transmitted througdg,z*1*wfadve3x r xvn6- w;hm;l4o yh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resnrg) .2zhe+* cvi 1rgjistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss dic vn1g rgr)z *.j2e+hue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long hzy/0sid/)w.j vl g n5oas 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 ws 05/gy.nidlo jv)/ zwith 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.s47z ,,pnva)bmhc8b r 9,udrl5bd8ep How much less power would be lost if the power were transmitted at 3000 V instead of d)h8p,alrnbbdmzs r4c9e7ub ,5pv ,8 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 20kg,fhn1 00f qpqjz+8c A. It is to be transmitted on a line with resist ,kz f8qg+jhfqpc100nance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy ibrm j11-i4a-gt cs-h bs stored in the coil's mi4 -bc-gat1- hb1rsjmagnetic 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 resix:*wbi7c 1vf60k+vm t kryid- mp zy7/stor and an 18-H inductor. What is this circuit's tim7/ty m 1d y7k0c-:f6mb*pik vi rxw+vze 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 rmwd/1z7snp p u*s 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. What is the peak curr-jzj 75jc2f orent?

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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 somm ,5xphn8tyh3 :htnta:i +0u7q6v outlet. What is the resistance of the lamp?n7+vmsmhtt08:o3:5 h npq6a htyxiu,

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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 mi.aoh*u7vt) wnp g 09is:n a9y:h,nyto a 120-V ac power supply. What is the peak current through the r,nu at y9o9. p)*mh ni:hv ny:7i0sgawesistor?

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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 is the powee/2qka.k)2uq nhj8vxhg9 9 txr dissipat g q2 .vk2 j9kthq9a8xxuen/)hed 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 5a q nzrjo9qbj2w as,r6 k1fw: 85:-fbg0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ru1 sl s4kw tdq6)4pr+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 resistor is ncn r 6+b:d qaofq2y,tmt;.z+$I = 0.80 \sin (240 t)$. 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 Hz; oie r; azgy.deus+67?

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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 r s ;kh)ir:;nvqeactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of indug j;gg ,o) o.ax(6tc snsu4;laxoc 7:uctive 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 /2lp 4l jrd3cu157 W of 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-mH ipx,rsrpngza129- 7 y0xx c-qrnductor when 120 V AC at a frequency of 20 kHz is applie09 gyp-12qxrr , x- acp7snzxrd 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 2.50kr4ohc(5aawb12c6 g o-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 capacitiv7z3 k w7v2rjfjk(.dnye reactance 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 reactance at 10 k 3sgu*bfg.s r,Hz?

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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 reactance35gs vi**ras r 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 106dgu)k0qm 1xi0 W0 dkg )6qix1um?

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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 0.001q/(kse 7reu/q 0-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 ac series circuit with 12.0 Wkwo9*5 j5* 1 jydzfv ;mzqku-s resistance, 15.0 W induct9jsfkz5wv kodzyu*qj1* m 5- ;ive reactance, 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-Wdzi 4p+x ja-3k7r ;rqp resistor, 20-mH coil, and 1.0-mF capacitorpq- pk4r3jadi rx;+7 z 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 +8z6umq)t/xb r7ad amd:u3ss, 20-mH coil, and 1.0-mF capacitor are connected in sq6radd m7b3t/ m)+uzu8ss a:xeries?

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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 ingdyn.7k /r y0kductor, what is the impedance at 1000 Hzr k g7kyny0./d?

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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 seriesf4 h7 scx hfgo) axt;382xqh7jv9atz0 with a 20-mH inductor, what is the phase a 8jhhxchqa;ta t)92 z0o fs3x fv7gx74ngle 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 neededatr. ja0 hj*t:w3bg i, in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hgji tat.h:3 *aw0r,bj z?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 1qttt0mh3+ b(t+u7h cb h:g-2bbsqyd 700-W resistor and 15-mH coil to get a total impedau tcmbsh7h2g hyq + 7b+bt-d:0(t tb3qnce of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series withj,w-sbg29 n emsiuo 5/ a 450-mH inductor at 5000 Hz for a toemsn-w5/, uiojgb 9s 2tal 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 a 100-kW resistor at 1.0-MHz 7 ./t6 dgwrhdefor a total impedance of dgr e7/6ht.dw150 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 capacitor. What is the imzbpln.om7 m 54.hc u4xpedm 474b zomp.hl xn.c5uance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at vmm9w:;4nxr1v v6q rb1.0 kHz for a total imvm v:nv91w x6qbrm; r4pedance 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 neklb)*g. ao j6meded in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofg6*mlka)bj. o $40^{\circ}$?

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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 serie(x.g 5/ 5e1gwawatb+cvmaj- 6g,ufu o s with a 30-W resistor at 1.0 kHz for a total impedanaag+ owf1a g.v m5xe/,uug jc5-wt b(6ce 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 i8ayw(hidxu :i4)3cqe*man.zi tk*t 6 s the phase anglem *a)(t6d8a *uxk4 iinet3ihc wzqy:.?

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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 5.5 h:pwj- beew70 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectewe- we5:7bjhp d 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 1;buotr9b; ,.i8ydtd a 00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the a;oi,9;b dudt t8b yr.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 capacitornuei pz3(bkqct+/lr: ape+c.,-q:oz of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connect/,c-ol: +ncepuik b:azprq .qt3 +(zeed 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 resisto b:)crdl,yj ey6ut;dc8:8 7qaa.kpj pr, a 10-mF capacitor, and a 0.45-H inductor, when connectet8uyld:ky .pq:7 ;er8 cpdj c)ba6,j ad 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-W res7uf,xop)vrzl, d)a y04lq + hsistor for a phase angle o) y )aozhxl,+lfs7pq04 ud,vr f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit ha,oud8x,0ojj. 4 0ooih+ubum nd0u lg3s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxdjhu0o3noi +4,.ol0 xj,umbg 80 oudu imum 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 outputi1 .t)k7 jfw2 ;3na q5iahksfs in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit kni.kf;t)h2si7wfs 1 jq 5aa3 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 cixpr2fhyg. p 6-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 a9qa-7 h4nphj fn4an)j resistance of 30 W. What is the f na4h 4nqj-)h9paj7 npower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-s t4lyi56 g,ipW resistor, a 10-mF capacitor, and a 0.45-H inductor, when coi6sl 45t,giypnnected 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 capac7a1vc(.9 bp: oecjkcs itor and a 15-mH coil in series?( k.e: cjs9obca1cpv 7

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needeapq*/d8t y5w xhb94)tgj.ugld in series with a 4.7-mF capacitor for a resonant frequency of 10 p dy tg*tq9l54/x jgh)8uawb.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 resonant2g offeslxw h1 f a.e(h;3bq*z)+skm 6 frequency of 1000lw o3a f h)m z12gsef*xk;+f(hsebq.6 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 resistor and a .dal dd vri)xy57*9b hki/g5i40-mH coil if the resonant frequency of the circuit is to be 1biai *v5 /xi5gk r.h9yld7)d d000 Hz?

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