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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 ue-6qhfwf7st2e, p 1t units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction7 fke0dd1:r un states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of 4ln0oz+ i3cydu 8y tfxq0lx45 h tj,:lloops of wire in a coil produces what kind of change on the induced z hxyc0l+ntuxdf j4:3i048 q l5t lo,y$emf$, 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/i (nex-/qg)quj 37 9-)rqgjpelbopb of wire produces what kind opeq-u p3ig//qnq9j 7)beg) ( b-lj rxof 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 producesf+we -ezx+uxo x:j+u(n tw 6dcu5e7 bo ,x)s:t what kind of change on the induced x-)xdzje+w so5(oxxf +et un +u w7t,b6:u: ce$emf$, 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 8n.n qxq ek+u:;bwk;pfield 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 direca*zw0sttr3o8 jcw/zhq9 /, m ntion of an induced current in a conductor will b 9t,h*aw 3/zwm q08 r/ctzsonje 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 magnet is held aa:qge;mw2u 0 gbove its ce20uam gw :geq;nter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a hor **-rta(izwi 09b swv)wxcq8iizontal table. A bar magnet is held above its center with its north pole pointing *rws -9 twwixva*)icib8qz0 (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 ovb/ m) l wy pk4ief7l:.6wa*fwhere the magnetic field vector points straight up. The magnetic field vanishes so.wkaiv * lel7w: f6 )fp4my/buddenly. 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 the magnetic field vect25h .1/i wmvz rsg7wpaor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indwzh2ig7r / pwvm51.asuced 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 togu+jp8a .:ppv p in a region where the magnetic field points straight down. The magnetic field disappears suddenlgjpvp .u a8+p:y. When 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 c c; 9)uxqxd urg+is3:harries an ever-increasing current nor9xhu3+rx;:cu si gq d)thward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering 2.joexq7 9 vitrao;x)f a (bp- 3/evfjfirst. As the north pole enters the wire, the induced current will be (as viewed from abovefr fj p-j/ eoq3)ixx(a2o.7t ebv;av 9)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisr(j1gmd. l f: ;j53jgitahs(w,cb9h e 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 ogh jj c:jab.,mhsi1ld w(;r5g 9fe3(tf 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 an q7g5rxsa(x n.;6-z5 t;i4pfn rggs cgaxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be theg ;.is65 p ;-z5(xtxn7g c4qnfrrg ags 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.zwyh i4g qn;+x m0ke-0b..zq p
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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 tlk1w nc7zi/nc 5fi r97hat 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 fieldj +a; q10llqof. 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 the east-wes8))mzo dq 7iw8y:vnli0n2 diat direction) is moved northward at constant velocity through a magnetic fielwln 8 :7 dd2 yz)8v)nimai0oqid 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 swvixx,0/d, md-wjz 3angular 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 tra:m/6mm ;pozn8 he*tt snsforms

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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 frequenc))vd;59dy 2szxeg lnay of the)v 29yddg5lz ne;)as x $emf$ 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 used8zuv1idu25fr to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device t5f8p/ibn p .k4v 3goxhhat

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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 loyn sk2yp7 xjq78y,d0pops than the primary coil then it 0n728qx pyksy7ydj,p 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 loops than the seconda05qh / baie(ep07ck fqry coil then i 57 cfqhbakp/0ieq (e0t 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 power inputy x9rd7/mhjd/

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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 resonag c9lz54qo3 n t/hwvy0nt 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 inductofcbpxx91 sfisq*69 o 3q7w,f) b1lkszr are connected in series to an ideal battery of constant terminal voltage. At the mom k9 9fi)7pl1qxocbw3ss,*f zq6s b f1xent contact 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 inductm)tiok 44zg c1 gcm1 fmiz4ok.7 pm4-oor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery,7igcfzmi k4c.4-o o1z mmk14t)pg4o m 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 zds/1*03iwqlnbq,zi j jdh,4 with inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 resistanc+w os6f5sx- ppe 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 xejfr0-s */oa series to a battery. The time constant for the circuit represents the time required for the curreojes *0r f-xa/nt 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 o e:h vqc:gs25in 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 current to ge 5h:v:qoc2 sdecrease 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 sah,juma7t1o-o. adh)s me 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 connecteea n,2y,vaab81 hf+aqd to an AC power supply. 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 connected to an AC power supply. In this circuit,1h 12xf3pvhixaeo 5z8my(rl02 2ony l the currenzml2a1x ox flh r 50y3v2y(ei2o hp1n8t

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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 circui(f4rd fz*i bh7t changes by what factor when the frequency is trip(rzdf4 7i*fb hled?

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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 voltag j,zbm)6rd xpn)(1gu me across an inductor is doubled, the inductive reactance of th, m1xr)zjp g)b6u nd(mat 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 appro/ jb(7dp cz7vmaches zero, the inductive react jzdbvm 7p7/c(ance 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 powe x)3kzbhlvdtia54m. 1 r supply. In this circuit, the currenkl vimx4 .)5thad13bzt

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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 whc1ym1s pp c 029f1qqdjat factor when the frequency is tripl90 1cdcm 1f pp12yqsjqed?

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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, thb 3uonz)o )q4k /0xe:suy dz6se capacitive reactance of thaq / x zdoz:suse)nyk4u3o b6)0t 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 voltagha , /id+mp831bieet kes of the inductor and capacitor in a RLC sp a+e it /e81mb,dk3iheries 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 kgmax(hy()r3 c7 7xim an 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 increasesj /9eevkti rb2g11j/y y 3mlw,n*7r gacc59z f. When is this state *,/wynbej5maczjr cg 2 ey1/v13tiglr9k f97 ment 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 osgy7y1( i dr*4 zfiyf+)rtu7s f 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. The impedance of t81 s x,7srgo, ouxyjh6hir:6uhe 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 capacitancfhix8 s6+.hml ,ieqx89qk: she both double in an LRC series circuit, the resonant frequency of that circuit q8xsh :s .i68hk9mheil+qx,fwill

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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 voltage. eu;zskjx2. zm7zc:q nq, flv5+jd -7h 0cwy+ g 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 7po(jvjl1 7j3- t zhffcircuit 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 radi b(f,h rij ,5vq bp.w-zzp (c.e3y-qbmus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magneti.,3-( p,yh qcj(zbq5r. fib-mebzvwp c 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 a1)oi :xjc(nqar7b, l9 zby9v0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field 9yava,: bj1l)qx7bz c io r9n(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 u(rrkyiq p6-x n)7htq7 niform 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-kp nriytr7 6x h()7qq 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 r )(zo1 +zhhkd(kgwmxwyk *2.qeduced 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 a*e 6;k:vnblm 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 framei4-+ na2 cko 5iqjron6 with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fi -co 4qn kio6ja+5n2ireld changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 gi -k obep 4u:x:;ii9rturns 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 area ydi 3;*;nietjjb/;d s vx02le$0.20 \; m^{2}$ 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 l ujkyyaq(qlay)5h*kcp6. *2 a location where the downward component of the Earth'sc2aqkp*l (y.l6uqyha j5ky)* magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angularcv 6d:o v0wgu8 velocity of 2.0 rad/s about a vertv8uodw :g6cv0 ical axis through 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 loopsuv5s+d1lkm vp 3p5e w ,zjobzrw )7,;d and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arsthx -.mpsb mh8co/g40u76v(v, ny tsea $0.090 \; m^{2}$ 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 armature. Each loop is 12 cm )p+5d fq7sjrpbxj308-hdkvyr6 tob2 long and 8 cm wide. The armature rotates at 1200 rpm about an axis paralledf06p bqx k7-+p t3jvrohd8 )j2sr5ybl to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the 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 of 100 turel,xe gqgl/zrm ,;n cqi;+a.89scg;p ns 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 consa2st7 vof3k 4tr) /ocqtruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magna2v4/qc )7 to 3trkfosetic 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 generatb bl(al -7uhxwt7;-(dpjqg q8 or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC movcvd/vouwm . x+6s8 .mtor 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 resistance of 6.00 W. Thc3r9yb ;twx/ t/i,y;ghp xh8s wo y+.ge motor operates on 120 V AC, and when running at full speeyw oth/ bc39/;.rph;sgty ,ywix8 g+xd 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 to a 24-V pok *l2*cc dc2iower supply. The operating current is 1.0 A. What is t i*cdco2*kl2c he 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 ,n:m;(cthx v7 ebx 2.chfa nm0resistance 6.0 W is connected to a 24-V power supply. The operating current is xbcnva ,2 x(me 07cfm;thhn: .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 6ksl+f/kr o2f : ycf/+h.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thkr /ff+/2 c:hkloy sf+e 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 azrc4,mqp x ;w1f7v5q is 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 7u0bnm-r jd;n A to flow in the secondary. How many turns arernu 7-;n0mbj d 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 +uep(n: xh if+many turns are necessary in a 110-V primary if the 24-V secondary has+ehnxfp (u+ :i 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 200b qc-hm, yf ,af/)oo5l*wv2 cl0-turn secondary coil. If the current in the secondary is 3.0/w)ya*o ,h 5m,vc l2qo-fflcb A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a trf uz*wzfmzu2)e :tt7)rlci4 /ansformer. Assuming 100% efficiency, how many amps miz)*zl uz )42c:t trf/e7fuwat 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 trb1cx fj0: ql.wkz w8t1ansformer provides 7500 V at 10.0 mA. The primary coil .8wz1fw 1 kcxljb0 qt: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 coil andxqnfsj:t .;jcmc- pik rz(i3p.*-j s/ 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the n z: *fcj/-i-jq p3cxmk j;.srs. (itpsecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer wtpg)-l0 a rxll*y7e8has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?*lwrt7pg8eyl )-a l 0x

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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 transforme**t1 pod8 6j4udj bt 2fn;ientr has 100 turns and its secondary has 200 turns. If the input current at the primary is 10n*fi*db6 2 odj 1;ettn ut8jp40 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 turdn8rry3*rm6 y8w kmx/ns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the *83/dxrywr6m8nkrm youtput 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 haq+2qcfz 5scx, 70vgm as 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglav2,+qcs 50mqgf 7cxz ecting 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(3) y8v;l x6 dnvduqpo A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the pro8; nvxq yldv) (p36duimary 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 volta -a)mbr;d;n-w;e a-uy ikwxru .3m gv8ge 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 wi na8uu rm vkg3-- e-; xard;)my;.bwtransmission 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 12 xfuu80s v81cn0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitteun sx uf801vc8d through 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 resistance of 0.60 Wy2 / /lq 0ubd *jim23bj:mto3c.s uvmc. 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 originalvumb3:y* cm jb0ods2c3/j2 u tlq/m.i 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 le+l q,mnlr qma4.co40ong 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 4l 4moe.nrmacl0 ,q+q 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 (sm2h bg9 rjg f+:+ wks+-(s.yn zkudb1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000-k 2gdbn+ (jswyh 9:mfs+ug.kbrz ( +s 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 ah9m+a7:zpj k xmao*k+ t 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a ta j 7*9azp m+o:kx+kmhransformer 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 storedb:ut5z7f vqcl6h)mrv ( h0l6a in the coil's lr)a:m b75 lv0 cq fz6uhv6(htmagnetic 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 an yt j2f)*7ajct* hvx0zd an 18-H inductor. What is this circuit's time270 xjy aj**ftzth)cv 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 volta()c l9;xw btbp9tbtc3ge 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. Whati6)js usr0m -s 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. th cl,-+zp+ndlt 2 mp5 What is the resistance of the lampmd+ctlp, znlpth 2- 5+?

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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 u .77x/z yjoihsupply. What is the peak current through the resi 7jh7xy/ .iozustor?

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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 8vvr qzcj(h 0-ac power supply. What is the power dissipated in v-qcj(8rhv0 z 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:fjf:o m : pi2mzj/gw0-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 res.9inq+j ae/as istor 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 5b31 y.ph b;9lajpt rf1zi4dt,0-W 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 of a 1.0-ydd+orr. fcoi(3+7c pa4 wa/kmH 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 reacta5nx4w1 m9v t(e r(etm.1hn hhance 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.x2 wggfsq1 *s+nq(c)cz rlf 44ke7eu00 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 at 10lafaujm-v46 r1 bt e8000 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 (9bq)aeooz t .7sfs -u60-mH inductor when 120 V AC at a frequency of 20 kHz is applied toeq out7sb( a-oz )s9.f it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcg1h-cjr /*gubvd7 .t ae?

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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 rebc)0g qvtc;( 6lp:zk 5jt+w rzactance 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 5q-6j px.mxd 4q swi;4f0 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 ofzjh-nmft9ek1i jqwy( 782f qz)mbv*, 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 capa n)7ksrsz ;(tdd -fm6hcitive reactance of a 0.010-mF capacitor be 100 Wm z-(d;f7rd n )sstk6h?

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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 1000 Hz and 5.0 Vrh -fcg i8j)y.?

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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 by 3e2 1)wffclpk9:hsfv-3s man ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and-smc2fplbhk) s9:3 f wf3y 1ev 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, 2df,bb/.vp (ks n swa3:le 9f/h0-mH coil, and 1.0-mF capacitor are connected in 9kp:fv (w adns3/f,bs/ eb.lhseries?

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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 itu2 l jmk0 a2;)bc9snat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are t0jki s c)u92;mla2bnconnected 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 ak3d cs,6gb 8p( h:jgvlo3-qfinductor, what is the impedance at 10da v3l,sq:jkc8hobg 3f (6pg- 00 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 connecteakaoei05:cq3 d in series with a 20-mH inductor, what is the phase5k:aqaie0c o 3 angle 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 wp/bua9n-*m8xzf 3kgv,3d cb circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanm pkbz*/cwg3bnfu,98 -dx3 vace of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resisfx 71r8d)0d bptg1vxntor and ) d0rn871tf1dvpxgxb 15-mH coil to get a total impedance 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 serie l jv2bn,d(mbpfso* 9-s with a 450-mH inductor at 5000 Hz for a tot lsfn,b*2 bjv-po9m(dal 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 pu2fgr7i eq56up t in series with a 100-kW resistor at 1.0-MHz for a totagi5fp 72eru6ql impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series witsk:*-5v2jjwcso 5 ta nh a 20-mF capacitor. What is the impedance at 1000 Hz?2s*55-kw:jtasn j v oc

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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 witfa 53b baj rj/(i9-ia-o gax f-ghg(9kh a 10-mF capacitor at 1.0 kHz for a total impedi5g93agf(kf xh i-o-/-aj a ajbb(9 rgance 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 series with a 10-mF capacitog;2:etysv rh u1/pc.zxk3 3r ar at 1.0 kHz for a phase angl3gts c;xyae kr u1z rp.2/3v:he 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 3v i y,f3l8z,owdp5fs- 0-W resistor at 1.0 kHz for a total imped,osily pf85 -zwdvf, 3ance 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 capa9 6sv gqc-b*lb qobe f/g:fd/xh)+7cacitor at 120 Hz. What is the phase 7/*g cvq d/lafx :ob-bbg9hcs)+6qfe angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mno*g ,o(snod3H coil, and 1.0-oo,gsn 3n( d*omF 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 capacitor, and a 0.lh lkk/cnb h,mx 3w.g ;* )egsvku,4z+350-H inductor. Thkh3) ml, *w +gbk.nheuc/ lk zv,4sgx;e circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductoreeidj03) hx; f of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?)0d3ie ;fhexj

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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 co 0w,b)c-lbn-k/rlt f 4a vwga.ig9z 2vntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H ig,.riv g-nbc twkv92)4bafa/-ll 0wz nductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a ph(pzbx) o/d ex3f8*ycqase angle of cox(y q/fpz )de8 3b*x$40^{\circ}$ 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 = (ch5oqz ab+he 9-cnp7 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivh7 zc( pbceq9o+anh-5ing 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 resistance, 15sajoj gcvyyli 1(1 rc2b+k. ;w8. jmu2.0 W inductive reactance, and 10.0 W capacitive reactance, 2juy 18ijcvbjy12ls. c am;(k.o +wgrwhen the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circui(1mlkuo makxl +s7yxb67 9md3t 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 impedancei)wd t3uh vt4; of 60 W and a resistance of 30 W. What is the power factor? )hwtu;t3v4d i

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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 fact3nl qo*zf su..c5i6ntor for a series RLC circuit containing a 50-W resistor, a 1nn6. lts*3uof5 i. zqc0-mF capacitor, and a 0.45-H 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 and a 15mmx+xt)3 6 lzx-d/jyb-mH coil in series?xx ) tdbj/m-yz 63xl+m

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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 forr/bb0+vpwj(1jhlo a 5 a resonant frequency of 10 kHz?bob v 1 j+0j(wr/5phal

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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 rqw; ojz*0h ul0esonant frequeljo *zu00 q;hwncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and ulduh2m9*fz +x/rb8qfcw *9v (kitl6a 40-mH coil if the resonant frequency of the circuit is to be 1000 H c+mlkrvx6dh(8iu*uf tlqz*w99 2/bf z?

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