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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 fluqp1af- z)b:ywx except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thamw**y/ tli+ho t 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 what kind of change on tf l) vua96lcbh17zy m-6l)u1cv9f7lma by -h zhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnen cx:lbs+( t3ktic field through a loop of wire produces what kind of change on the k(nx: csl+3bt induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chanu1ixxgy s: tgg15r92cge on the inducedgxx gur i 1ts5:9y12gc $emf$, 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 faowoc 8.izgt o j3973oja,m u1rom 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 current in a conpot.mcp4qdd/:fqw ij -52w(a ductor will be that which tends to produce which of the following effects-4pqia2. (wq/pot c wdfd5mj:?

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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 b8g7wnlzd9u/ 1y tlcb, ar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed ,z71llnc y8/ugwdb9t from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovnw z wwq76 s51d4zah-oe its center with its north pole pointing down, and released. As sww4dwa z7zo6hn q1-5 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 tables4 : 9 uazpwgqp5xc(l ;i4u;gn top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. Wh 4up;5 c wl:;(xiznsq9p ag4guen 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 leq(m x1xdal ckn:1 ,3nevel 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 cc1eqn xakn:, (d xm1l3urrent 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 regi*deozw 4rgdw+l4ed(fv *4 t r4on where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil wfrgwd*+44 rdd(o* le ev4tz4as 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-ah6 h7t jiu9j on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the t u69hj7hji ta-able, 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 / zn 61c./a bbf/kkeqoof wire with the north pole entering first. As the north pole enters the wire, the induced current will ae/n./qb/ kkb6fczo 1be (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 constant angular speed about an axis 7 gdz+ .0qf9qc)wr a9xqes ;owwhose direction can be varied. In a region where a uniform magnetic field points straight down, what must qeqws.qr9 +0 ;o7)wzfcgx d9abe the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated ac h n+xav1)+xrt 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 thehcx r1+)+nx va 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...bc 3lvso e)t8cu9we
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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 that an n k,nl tywe7r ua a7pk 9od,:30cc:td s5a--xu$emf$ 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 m79p c:chgd)w ig v+ecu0l8az7 rlj60o agnetic 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 itid r/jqy/nhnb d6n6 aw5-0f-n the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement conceriwn5d bd6f /0- 6tna qnjyh-/rning 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 angula/z2 ;xzv7 fj9nuk h2nhr 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 tv,fvmjw *a 8sym* 77atransforms

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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 frequen fi2r3mzjd-d5ky8) 1i hmhd*qcy of thefyihd2dkdr18*h 3)i-jm 5mzq $emf$ 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 used t x9 vobfgr v-;x2t;ts,dzp o6/o

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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 that6 k4uh2bm;lu: qm8g bt

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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 coilvjbxz1)sp enba*3)v b 5k smaw68oo;bd /xt(8 contains more loops than the primary coil then 6*(v )3ato;e b/pbmxbsozns1)85 jwkvbda8x 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 p)i2cfk m,i s2the primary coil contains more loops than the secondary coil theki ,f2p)m2csi n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpx4i+jda87jb2co,+ b t yg;jnq ut

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ciq,c ee.2 iynm:rcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal baj b: 7f43pgzg8f2fqunttery of constan78g:bnz2 4gqp3 fuj fft terminal voltage. At the moment 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 inductor are connected in series to an ideg*s q 8k9sryd8z4er y/al battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the induc /y8s9*dsg4z keyr8q rtor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and res(8zh2i ccr* ley:zp qk/)9po distance 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 resistance R is connecteay) tq 9bd4 jt yf.sdnxre4wdw +3h5*ixbr90 5d 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 connecq,..vxzy1y,t tmr4sl8 1 znx4s osbqp u( 2e*rted in series to a battery. The time constant for the circuit represents the time reqt(48pxsst,lrvo1.y,s e*nbuz1q yrm q4 . zx2uired 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 connec+67;ea2,mi,/fv xchaf f ovohted in series to a battery. The battery is suddenly removed fromoe7c ahm vxh+a fo;v ff,6/2,i the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following ham(y60w1e4 t 9fxdq1ykh ,pptrve 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, aul ebfq,mrha/4wq*m8 1w*v 3aedcul s*a 8(5 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, the cus b1oh s.cze:j62w3gurrent uosb:312g6 z.shjcew

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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 acm nn c wj0n-7i,ee80da circuit changes by what factor when the frequency is tripled?,n80ne-dcw07 ijmn ea

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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 AC8oub0498/qs hhz 4ysx okwi+d voltage across an inductor is doubled, the inductive reactance o qoox8/+s8subh z4i dyh0w4k9f 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 vol jn2q1 7noc0;w-lepsv ca -e6otage across an inductor approaches zero, the inductivejeqw6vsn ;72lc caen-o0p o1- reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuitzse y: h/57 zxqbog8 g7(s4,obf4hcxf, the currento 4hg75o:e,8fxz 4z by hqs7/b( cfsxg

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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 a1o9/.ezsvrv,ag vqnyz; )i7 fn ac circuit changes by what factor when the frequency i 9isva y)7 ;z,v1.qz/rvnfe gos 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 ;ooeez n+98qhthe AC voltage across a capacitor approaches zero, the capacitive reactance o;zoe 98+ heonqf that 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 voltd 35ml o6rsje(dy/rhn-* o9bnages of the inductor and capacitor in a RLC series 9e nd/ -n(j3*r ldmhrb6ys 5oocircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is od dhs:9z3 ;n2hxae7odefined 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 od )mq +fng+nq1 /7tvzwf the circuit increases if R increases. When is71)q dn z+gvnwmq/t+f 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 o83 aggcfx71e tf 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 imped-8(wp,h9ih (mae be uvance 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 doude xqgbs *c7r90s, eba* egd6-ble in an LRC series circuit, the reso 7 e9cesdgd a*q0ge6bbxrs*,-nant 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 a6etxwd. .+mn i/-w:k wpg em,;m fq+tppplied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occzm3.3y/2/qk ew6 p z0gxpkdqrz lp axd6n4)7turs 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 8adtc u: zz2 *wa:-ys xu+ud+orotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o+yd uu+*acw-tua s x82 zodz::f 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 field of sgbcpu-:mohy(e wx899oc 3 :b j0s4ev 0.20 0gj(bb 4:yx pcmc3wo-9vos8e9e:h us T. Find the magnetic flux through 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 rotatingnv230 xs; it-h tg zi pb7lv6l.nkl*u; in a uniform magnetic field of 0.20 T. Find the magnetilut-h*0 s26n;lpb iv7txvknlz;ig3 . c flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an ad3vza1f9ocj 1gs-0k6 ny , 3plz4 tasitjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch wf,xw79+p rud.9hmuy anges 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 withubw -q:vf-6 )plte(g v 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- (l-)gtvq6uvewf :pb 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 of fy9elul 8nv44)t;ewgi;e7 x a$0.40 \; m^{2}$ 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 ar)p)ib,f7 l yurea $0.20 \; m^{2}$ 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 location where tii zlji9:d -; v ubf.7rf8veo8he downward component of the Earth's magnetic field d f7vju;8 lz9i o.-b8v iefr:iis $6.0 \times 10^{-5} \; T$. 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.,jh jjkp0h:1z4h nr-r 0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical0h: r- j4hjzpr,hjnk1 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 has7 *gyleu 30a 9*zcpyam 50 loops 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 5xhdc+ m*p.wktn 4lg)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 armature.nn iq17y,b0ml Each loop is 12 cm long and 8 cm wide. The armaturel,i7 0nqby 1nm 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 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 consistshya7m/ci. 4bi 0ns0ow z d8dp0 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 genemytpavzk6 s:+o)l q2/rator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is ava:)lz s6 typkq+ 2/movailable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with axqm+q-ej)gtg-xpi, k9o4 r* o maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatev o,a/ eltk vo-igy1;2s 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 resf)4t cgqdr(mctjq 4p6xg/,t6 istance of 6.00 W. The motor operates on 120 V AC, and when running at fut 66rtcc 4/qm )fq,j ggdtpx4(ll speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance4 *o4szhg-mmt 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whatm-mshg* o4t4 z is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is covj.lq3 aav d f9c3pv7;nnected to a 24-V power supply. The operating current is 1.0 A at full speed. What 73vajlfq9;c3pvv a. dis 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. -cf w0py1 2/xaspot(x0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What iy0t( 1a x-2cs poxpwf/s the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to redu-7q,gk dc1 jv6qpa,xezuu, ( xce 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 ypp. fnq*nga) 3nto,3upd,v; a transformer causes 14 A to flow in the secondary. How many turns aref*)y3gtuvpdn,n , onp. apq ;3 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 t4 nf;/;mpf bdb:tt y/3qrgnm8urns are necessary in a 110-V primary if the 24-V second/qn yftf8bmg4:m 3 tpndb/;;rary 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 coidbol e1o7f ,f,j.pq*b l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is thd boe*,pq lofj71,fb.e 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 v-x 6tvn+-) n5prfmbn+ia8jm of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?-p)+n fj 8a6x ibvtmrnvnm5+-

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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 ne0d:a o1pqqd6uehv +l5 zanq ,)on sign transformer provides 7500 V at 10.0 mA. The primary coil o ql a1qndheu)a5:dq v0p,z o6+perates 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 turns on i.fyy : rzuef.8j77i gg;h 6rvlts secondary coil. If 120 V at 2.0 A is ap v8zrge : jff.h7iuyyl.r;g6 7plied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnsm i l1 3xskecq .z:p13ptv05de 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 se0qdl: 3skzti1.evmpx5 3c1p econdary?

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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 100 turns and its secondary has 200 turns. If 5b9d ymwca5/91btp k,lw dd 2tthe input current 1alk wbymdt59dp 5 wbt,dc/9 2at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ha )/8-q zc ym*ub0wamoc3wk/ie s 100 turns and its secondary has 200 turns. If the input volta 0bez*/i)qw cwy3a-mc8o k /umge 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 tur89.yt .mkhfxi ns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the p9t8m hx y..ikfower 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 voltag4v27l q sr3v1 u kcb3w8yc2f9 revxbt3e is usually stepped uy4qub vvl23w3 8f9er sbcv3x2 crt1k7p 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.

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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 +e 1sxeiofpj.+ .srm *A of current at 120 V. The voltage is usually stepped up to 4500 Vsxie+o fj..s* +prem1 by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at- z- ceekz:i2r3hph,t 120 V. The voltage is usually stepped up to 4500 V by a transform2h eh zecpi--3t k:,rzer 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 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 W. A gene6qqu35ka.j ah4o mi w0rator 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 would be35 6aiou.hqq 4k0 wamj 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 e ; ji(iecm5cm2ok4s8/:v-h 7 fcbjd vkm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss du jeh7( kdmccmoi2:4ec vv5;8s j/b- ife 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 when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lj- 2vzih tj dz(+3r w;p3rbl3tess power would be lost if the power were transmiv33r3th(j-zjdt;iw+r z lpb2 tted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a l7 phr 8jjoq;m;ine with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tranpj; ;jh7q m8rosformer 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 st/h e;v0z * vnud80wlghored in the coil's magvd/; eh8zhn l0u0wvg *netic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H sh1 jd1hkc ;/tinductor. What is this circuit's time constadkh1ts 1ch /;jnt?

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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 a03mqfv; trv(y n AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1okh7 qa(* go fkas*4w+20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lx4ps.hh9fqv-:s9k1vj gx ./y hywfw5ayyjx.pfwhvw hs f549 hs. -9 1/gxkv:qmp?

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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. +qhgeohphu -()qtb:(*co ;a t What is the peak currenguhac:q e(( toht b-)p;h *q+ot through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suj(1k7 m/j45wyzi fj( tu.cy/p ndizs3pply. What is the power dissipatey35d/cwi(.y4uk7t 1j nj(mfjipzzs/ d 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 d0nerto;eo(+ ; aacs,llhg3 -a 50-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 resistor mok)lj g w 7/3p(wzq6zis $I = 0.80 \sin (240 t)$. 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 resimm. ya bn+76cn h3aa,tstor 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 i tab*6m1ybs 0wnductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atr bh: m9m92aze 4itxl8l01jjf 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 havp o:3n5b( tdnhe 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of indu8l-k1; g7.oa xtm7nrakizo2 rctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC yx2r8:b;z6 h0 a xxcdkat a frequency of 20 kHz israc hy 0z: kxd;xx28b6 applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-n hhgqu1:5i-rmH 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 reactance of a 4.7-mF capacito,p ; (e69 mu xy.7in:yoqpnpc*;wca-t4rt whhr 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(lsnz/*ige -y719bgvh hjvw8 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor havs w z0m)xgl 741)fk f3a4z pdk5hs0loee a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.017u9l mxv515tro,qc gy1pfixln9tt7 h* aq7 :a0-mF capacitor be 100 W?c9tm,qpu17q ll rt*x5 iyvghfta7 : ox5a n791

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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 caumkl2x ;/iu l/ -z(hnwpacitor 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 ax*q 45 ib ypjmp iuh v0-qzw:06t.nte:c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacit46-pem5qiqi:j 0 w zhtx0t: b.pvy*n uive 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 ;f 2s7m8mi fhbresistor, 20-mH coil, and 1.0-mF capacitor ;8 ih7b2f mfsmare 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, 8 iyu 0*k7v)u41m)7h ok mmw(u eewvfr20-mH coil, and 1.0-mF capacitor are connected i(myve*ewu7hm m048w )kro) ukv7f i1un 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 4wo ra)*fyz3f2) b,o m(xxpntin series with a 20-mH inductor, what is the impyon r ,(xz3p)fotf *2mx ab4)wedance 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)dt ;so r1j7uynnr01l with a 20-mH inductor, what is the phase asron ;ny 70l11tjdu)rngle 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:zz 3f2-lq u.memy8mlv7h4hq0apy k1 in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10 .hvaq0:m1yq y2-mlu z fkzel34pmh780 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 wit - r+ls+z7a/j om.1f flydlmk5h a 100-W resistor and 15-mH coil to get a total impedance of1amrlm jdyk+f+5 oll.7z f-s/ 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 with a 450-mH inductor at 5000u y.-ihx uu0awqgyi+is8:+ 4e Hz for a total impedance of 400u.i0uuy4 x8+ +:ihawg yseqi -00 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 a9 w :*dhn4bkm5ba+yyvt 1.0-MHz for a total impedance of 15+k* y a:hy5w4n9 mdbbv0 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 impdv ;mqc1cscc6-o7 /buedancb6c vm/-1c7d cq cou;se 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 caffsatiw73 u-8nhg2/ t n5ee:u pacitor at 1.0 kHz for a total impedanct:an7swfnh 8uf g/e25utei3-e of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neededoew bc;xfe6x9:6id x) in series with a 10-mF capacitor at 1.0 kHz for a phase angle :dwe9xx6 6b)ixce f;oof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-Wd l4awkjy, q6.1tb0o, z3t bfe resistor at 1.0 kHz for a total impedance of.b e1kw ,d,ybqf t6z oaljt403 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 capaci/b)vksc f g2j:m1 of4mtor at 120 Hz. What is the pha4sb o):mvg2 k1fmf jc/se 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 10eu qsoo6849+ pykhtc500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c09uhk yotpqoce + 48s6onnected 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 consiez heh2* 3zt(ests of a 100-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 2*hh(eetez z3 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 capfdxdmxh 9:76*ep8 s hdacitive 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 thi8 9xf7:dxdhps*6h emd s 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 resistuge h.,/hbilz );8w vbh/u8smor, a 10-mF capacitor, and a 0.45-H inductor, when connected to ahl,/vg iz)b8u .h hs/ue bwm8; 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 phase angf5xpo/b3*e e3e xonv-le of3xp-o oe*v5xe3e/ bnf $40^{\circ}$ 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 = 20ra 5/iuzff,lhpd 9 f190-mH, C = 10.0 mF. At what frequency should the circu9ui ,d5/hffp1lrf9 zait be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in aap sqf42t wgi;c md/w-t.2 b*qn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta *.4fqa-iw2/mtt gcdbs;p w2 qnce, when 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 cite 32-va8viswbx4i f6rcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resista + p3vnjcy0hz:f,mh,n nce of 30 W. What is the po h p+fzmy,,nvnhj:03 cwer 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 a8a.7+ ryrmyn,iu )ido 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, o, myriiy7ua)nd8 + r.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 capacitoxv/ )77yll xt,jq1do sr and a 15-mH coil in series?7 lo/dv,q7 )xjx1lt sy

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neede rw8z0gi5n x h4gg-8qzd in series with a 4.7-mF capacitor for a resonant frequency of 10 h izg0wr4- 8zgqx85gnkHz?

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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 ojm s qm..:ohm) y76q3d* gmvain series with a 3.7-mH inductor for a resonant frequency of 1000 H :m3mm.vj gh)qqo* sam.o76ydz?

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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 wit+ tv3:yjyf4vrh o:+(fe -n cfxh a 30-W resistor and a 40-mH coil jny 34ht-evc(rffovx+: y+ f: if the resonant frequency of the circuit is to be 1000 Hz?

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