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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: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceptsbcggh d5yms0t z,0 /*

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thesi f igp9+i-4s $emf$ 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 prv7udtbw2 pu i+5mvkjvggbex q0wf-c/1l83*7oduces what kind of change on the indu7f+1kgmd5c* b / v8iwqgt3 xu2uv7ewv0b pl-jced $emf$, 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 dva8tx)nilz w+cwuw37s prwdg/ 45 07qwk/2h eld through a loop of wire produces what kind o/3/vqlgrdwx48+ a uwn)tww5cisk77 hzwd0p2f 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 loopia1r momed8* 1n2 b*tz uz)be6 of wire produces what kind of change on the induc n61 tz*1du*82m biamzeebo)red $emf$, 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 fiel./2.dnp(6 lmvbx zuid.-fkwfq/l, b q d 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 bp r176djqj 0l(.88coe7fqgqi suni; current in a conductor will be that which 8j c60uipq.bg1oisr7f(q;7je qn8d ltends 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 hzbi, puy1*n:above its center with its n:y bzih, *n1puorth 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 fl32l7 tmeq durw)nbfq, f1w 2e6at on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and releafmqlf76 w,brn qtuwe2d 1 e)23sed. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poin7evj )u.bfj/*w sa2fcts straige) cbf/.wfv* j2 sj7uaht up. The magnetic field vanishes 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 t;qw(5 1ni-8equcrsx a level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the qn-sxc qr; 1e5wi8ut( 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 regio. xuvm6z/bv64a k,mrq 0l duo-n where the magnetic field points straight down. The magnetic field disappears d4o 0,rmxu v66-vkzul. a/q bmsuddenly. 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 liety x b)nrz(j9-s on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whentn)9bx zj(y- r 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 firstgq70 cay 1zx0o6 ubb(8g sow0hisxo7, . As the north pole enters the wire, the induced current1ugb0i g zqys8,6(a oooxb7c xwh0 7s0 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 rolmpxc37 28m/wlpfk c k-p2; / kvgcz0mtated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muspccx kmkl 2//mcw k8lp37-m2f;pz v0gt be 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 at co 7y5hu fm4-yleu8 4oh6ez(f8u bufiw( nstant angular speed about an axis whose direct7 68uemhuul 454 8ueyohz yffw (b(-ifion can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.pt:/r hb9rv 3p
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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 q9mj4/w2svid t5vy k5 $emf$ 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.ory c3+t/qu8smv 9yz : 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-west direction) is moved northward at cvz6ims9 kwj gpm(mo5g /z ;r2/onstant velocity through a magnetic field that poipzrg6 (5 ow;kj mz/s mm92/gvints 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 rotates8nateop r s(8z ni am) )./8ow4,nzksq at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trfh svls2;bn ea2d(v:. z*hz+fansforms

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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 6mm:sjmx , o:*j2 qcjpkhj)3i37:lgqt 0 revolutions each second. The frequency of thmh7 3:,: :j xotmi3m*ql)j j2gkqscjpe $emf$ 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 devicwk s85t,m/4l y2 az)m(la lmjge 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 devicg z el.nf.t/0pao1-kcwvu 5 .ge 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 containsy:n x)p os dji+13b+or more loops than the primary coil then it o+s1+d:xin oy3p)brjis 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 moreg qim6gf,j(x8spn9.k loops than the secondary coil thenn,x9g p.qifk 6g8s(j m 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 p c92c 9ouidle5n:g8:gp;bq ta ower 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 resonan yip -ukbc/(x/t 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 are connected in series to au5m;kgu euro/0v qo)+ n ideal battery of constant terminal voltage. At the moment contact is mau /u0qvg ;ro)mu5ok+e de 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 ideal batterye7 a:o0 ck2daz2 i,lvh of constant terminal voltage. At the moment contactoz:2,h2iek0aa c 7vld is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectei 5-xc+bpif3 ,n8ackk (38gmuqlkew9d 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 inductlopin xe 0c (h3ec6o*.ance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to azost g/ e/u30o battery. The time constant for the circu/eu z0to s3og/it represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in se gb**.mdy 7biwries to a battery. The battery is suddenly removed from the circuit. The time constant for of 7*gb* mbw.yid 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 v.xbg /3kvapvq .yqa,z+jb /6have 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. O h;m-k9)z tqhnxzcw tl(y,1h6 /q :eisn 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 po6cehac00/(ornlx ,gx9 u c2p awer supply. In this circuit, the current p0hac cl 6e,(cx9noguar x2/0

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequ h35+5fc4qr1tbqv dtatoo0j;;w j.e gency is tripleaw;;c.d0jtjqb5r t3o+4eo5 g tq1fvhd?

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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,-uu** i k.m9cpa4ebcxl50i t zv, rw*g the inductive reactan z*-*p c rawiuxbi,u *ct5kvlm g04.9ece of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage a dmn)xx;gax in 45y6q0cross an inductor approaches zero, the inductive reactancx6)n0dxaq ;mg5 nxiy4e 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 supf*ii- pfy,dit 1z5 b-wply. In this circuit, the currentitz5wdyfb,-p*ii -1f

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance4() d2hbuqc- fs khk ke)zdn3a-s21qf in an ac circuit changes by what factor when the frequency is ts-sbfqhu4)cazhkk2 1(2d k3e)f q dn-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 the Ah5d m:5 -lg3y6qv7syw9der6o uz m grvve 6*/cC voltage across a capacitor approaches zero, the capacitive reactance of that capacitol m vych:r6dw- v7es guomd*y 65vg 5q6/9e3rzr

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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 a. gvq,*si9v xcle28j boc(3aof the inductor and capacitor in a g*vvjlc8s. ceiq9a2 ,(x3boaRLC series 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 ot;): j7 fhdpean 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 +ze nwk)*:ldg 7gzxku s:(d-gthe circuit increases if R increases. When is thisud k(+x n) g:zz7* dglkewg-:s 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 impedancq r 3wdm/al) plfo91k2e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The im2q6 zv m4iu m1pz-6byypedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, tkz (a yfm,twplw,+wyzg 14g :u+l g:sv-xfb:*he resona (y gl:1 z y,-gf+w+fvw xk :uz4mswtlba,p:*gnt 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 applied vck svb5,j0/;xx v6+z d*uk sdyoltage. 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 serieb-* e;5ni86gdyia a7 y7m dbkis RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mag-s b5 4jgrqy6jnetic field of 0.20 T. Find the magnetic g -6jbqy 5jrs4flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.103w(b8ivb:kps0d7 k o(ed , rse m is rotating in a uniform magnetic field of 0.20 T.p3:obd(e0b8k ,7 i ss kvw(edr 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.c x4r 1rl-xr)c10 m is rotating in a uniform magnetic field of 0.20 T. Find the magne-1 c)xxrlcr4r tic 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 adjustable singsz*/zeknv*qp (i v 00nle 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 changes from p:7j psuq+pjm; 68t7fju-eap o,f:fh $4.0 \times 10^{-5} \; Wb$ 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 ag ujodv;0+0h xoj d*+6kueat2 square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fielddou6ev+xhj2g atk*;j0 u d+o0 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 turns and ,dgwef 8 ey+h8an 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 ab rpf,/5i p ghg4k/m1 6tonr8hrea $0.20 \; m^{2}$ 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 )v 9/ pr;mvqr,lgezmk( x.gc .where the downward comv.eqzrgm/vr c(g x.,)p 9l;mkponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angul(sd-sz8pzdj5fh -yrz ca5s 4:ar velocity of 2.0 rad/s ab(-y85hsdz cdr-z5sj p:az4f sout a vertical 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 utp+ nk01/cu r*;nzy xujl1*cloops 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 wireyb 44fdk4 fo+e 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 armatureyn iu dqf ;ot.j12i*1v. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will bo.v qi1 i 2yu*fdt1jn;e 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 turns of wire of area g4ih+0opfq + rbz3b1y $0.090 \; m^{2}$ 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 generatorm37ns x.b b, kcdc,p (:iryex+ with an output of 12 V maximum when rotated at 60 Hz. A magnetic field b,y3,mk . p7(cr nsxicxb:ed+ of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator jd-9n( +hprx -z7mug6h38zmqh7tchx 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 motor have a resistance of 6.00 W. The motor operm4ddih +xjwp;c4ztk c367 b ,qhhe z+(ates 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. The motor op+6w jqxmadceuj .+;w-erates on 120 V AC, and when running at full speed it generates +;.6jja quwdcw-xm +ea 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 power supply. Th3iy8dk(*ebbh u1r;fv e opef;(1yuk8*bd3 rbhvi erating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal7 kjwvzg4;n w( resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the wn;74kzvg jw( back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is con fr3fxn (9bx1znected to a 24-V power supply. The operating current is 1.0 A at full speed. Whaxfb( r9f31zn xt is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduct u-* wp)t7yd,tuj 4wfe 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 transfor.n v :ng371ffr-gziptmer causes 14 A to flow in the secondary.n: p vzt37.fgf1-ginr 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 ar pe: 5wqkn ,jyqw3d(j/e necessary in a 110-V primary if the 24-V secondary has 100 turnqd( ew w3kqjy,pj n5/:s?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists ol zw*m7 xp:m*.cs)b zsf a 500-turn primary coil and a 2000-turn secondary coil. If the current in thcws zzm p*:s*l7m) b.xe secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 10 .5 sma onvsv. tgr(y9k1f*2cz0% efficiency, how many amps ascz 59my .r*tn(v .12fvao sgkt 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. 0yvu;eeoz(d rxkr3:0n d7y)oqz2 4aa The primary coil operates on 120 V. What does the primary oy2e: z;x 3vok e(0dar)yd rn74zq0uadraw?

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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 at o2fs5uwxc6h 0,b9mgwe /+ 1o mgx6mhs 8s8frnd 300 turns on its secondaryfx51b,uw2mf w9s gm0 e/gohs6x6sc 8+rhm8o t coil. If 120 V at 2.0 A is applied 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 turns on its primary coi,qh nwh az tdz05);tx-u6cw7 gl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prixhag5 -u7tq;6z,t ww cn0hz)dmary, 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 transforme 7n3*3ylcqrf jr has 100 turns and its secondary has 200 turns. If the input current at the primaryr*nj3 3c7f yql 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 second z3(9(p8pbt9ookaq xa9ah(u pary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vol98t 3(qapkxha(p9 za b(opuo9tage 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 c0 2ub b-1eypl100 turns and its secondary has 200 turns. If the power input tcb2 01bpyl-euo the 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 V. The voltage is u wy78 -b/pdqe/nwa(ebsually 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 yawbndpe b(/wq7 /-e8 secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of ckms; 7 lbq+x: 5bte u(urlc,9durrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and e,mcud ;ur :llbstx (bk+5q 79transmitted 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 2lubxpb 0w7 7py,y. serm/ :ws60 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 percentage power lo.e/ l b pb rw720x:yu7pwss,myst 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. Ai(yg6 -d v(ebo generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer wereib( -eoy(6vg d 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 has a total resistance of 0.60 W. A geneje4; qix :;)ctb 1a/jrzsa s8;5ukjo orator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissionej)jb ;8; j ;rc4a:u aix t/1skoozsq5 line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wou6byr mmlbp2+. ld be lost if the power were transmitted at 3000 V instead mlry6. +b2 bpmof 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 line fph ;ga0a db3 xj1qu-7with resistance 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 pohp b;j7 ag-1du0fx3qawer?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored ig-lss 3j 8ixe9;g 1sofn the coil's magnsgjg83l os1-;xesi9 f etic 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 re57b2mc4 ;ez6c5cohutpu5n a*ox od; wa)gmj 4sistor and an 18-H inductor. What is this circuit's time constg;can;hoa5uuj7d6 c x*cb4z55wmt p)ooe42m ant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage 0ra9mp k8f ao*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 pei6(,1 h *an mygjwg8ivak 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 outli36cocwa;b9n* 6 wk mket. What is the resistance of the lamc6 mk;6awwbcn i39*o kp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cur+w6k)vu6 y6 lh;h3oll u p86vok3eirkrent through the resistori6 uoyho3+)luv8wk p; ke6l 63hkrv 6l?

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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 power disqhf61qm. fyqmmfs ,i/6xxbb.tq utg* +9 .;x msipated in the rmxxfmqttiq*x9s.1gh+ .um,q q6bmf 6; yb /f .esistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ajp 4utd/p9sy 57w5sha 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 50f:frau3v 7h8-ur gpe)-W 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 ,a48s )wgtjrje0h2 f+oqbtm 7 a 50-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-mH inductor agqs mxj.e.2i.sxa+ c2t 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-m4yt:l-w jr)p+qg kif1qmg5 ,h H 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 induvb2 4b jym+ -5(crzeqmctive 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 reac9.it ri ja(b1bw,re, atance 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-mHhi(j 5buo8if 0xvn:*t inductor when 120 V AC at a frequency of 20 kHz is applied to ixt 8(oiju0fv *h5n:bit?

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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.glvb -urtkjrwuh u( 30+)*fn:2hely-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 reacta0bt7ijv xdeo3r26zf nz s634cnce 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 reaca wzwa00uo 0/rtance 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 h x2frr7r i79edave 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 t.6j1h)e ty r5suvbtx6he capacitive reactance of a 0.010-mF capacitor be 100 W?ey65xt )1 bs6h j.uvtr

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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 100tdsb1,eov ;kkt )c)-m 0 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 circucg7hcanriu:a, kp5 09/zf2uiit with 12.0 W resistance, 15.0 W inductive reactance, and 10i957z2, iaar:pu hngcc u0f/k.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 c 6vak5m6hyv8 resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie6amh v6 vc58kys?

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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, 20-mH coil, and 1u nzzd:+)sid( .0-mF capacitor are connected in se +:sdi ndu()zzries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wha1-)zpreg1. /a0moyke myxb 2q0 wqq0jt is the impedance at 1000 Hzyzpg0 wr0-m1qo eme)xjbq kqy 0a21./ ?

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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 bqdn5 84qp, cgwith a 20-mH inductor, what is the phase angle at 100pcdgq85 4nb,q0 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 circuit wipb543l -l3tu) nsyerwjk: w* dth a 20-mH coil and 1.0-mF capacitor for a total impedance n3s) udbjk5tpwl: r*lw-3ye4of 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 followingl8 +ljapt h- gy)(yy) 1kw;qyt capacitances is needed in series with a 100-W resistor and 15-mH coil to get wl)q1g-alyjt;y+ (kt) p8h yy 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 series with a 450-mH inductor at 50xfz1 et1 o*bd07hy c2i00 Hz for a toi1yho7 cx*2d1fbez0 ttal 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 wt9t6xvi j v).kith a 100-kW resistor at 1.0-MHz for a total impedance of6j .)vtxtivk 9 150 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 seriesu/qdgv/o l(q6 with a 20-mF capacitor. What is the impedance at vlg/odq (6q/ u1000 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 we 5 +i8)pt9qz-rkdevat 1.0 kHz for a total impe9 ve-5kpwi ztr) 8d+qedance 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 capacitor at 1.0 kHz for p-ifb +04l6kmi0/zz g+dxnsw a phase az+iibdz x g6/-w+ nlpm040sfkngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kH s1rw-z9 wf*ti i(hge3z for a total impedancfg9t-3zi*w s w1r(hie e 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. u;c5g(rrry: y,f t4(uxss;vl What is the phase a;s,gf: xrsur(5yvyr 4 ul(t;cngle?

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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 resistczcp 2ahdk 1ke)l5d09or, 20-mH coil, and 1.0-mF capacitor are connected iae)c5hp 21z9l 0d kkdcn 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, l 0ca(c,abew 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 aw(ca0clb ,,ecircuit?

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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 cap6967 (uhfq uh2fe.pktk wo/z+ yoaa5pacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriuz +aq6ykh/fo27 w( 5tu6aph.9o kfepes 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 serieyp,iyis sby q ,lvb--;,b 1o2os RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H2 o ;vyio,,qb1b-p yibs-,lys inductor, 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 phase ajv rs7,q :oon,8;tagangle of ,7gon; a: oa,sjrqvt8 $40^{\circ}$ 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 = 20 1wulrk8zp(b 9 yv9 o can;.l;c-4dpna0-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power t v uwk-br4 palcy;dp9o8z(9 n;cn1 .laransferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac s(y dlvss*dt4; ,ggn:p eries circuit with 12.0 W resistance, 15.0 W int g:dyv4p;( g*sd,lsnductive reactance, and 10.0 W capacitive reactance, 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 A o6urkk*x6-rt z(d6e qC circuit 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 4fda :hro w0f7has an impedance of 60 W and a resistance of 30 W. What is tf0h wa:or7d f4he power 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 circu c.gdud ,1wyq;it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wh;q 1u.cg ,wydden connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH vs2urzw 6h*y5-et wk 8a-lzp.coil in series?.rwt6e- z kvzwau-lp2sy58* h

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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 d)j t96y) enkb7;mng afor a resonant frequency of 10 kHz?ed y6mnb)a tjk97g;n)

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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 wib) -dtgv/7lfsth a 3.7-mH inductor for a resonant frequency of 1)- /fbdsgvtl7 000 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 df:yr,pxha32x ac6 )wa 30-W resistor and a 40-mH coil if the resonant frequencrcx2x a:ya)f wp6dh3, y of the circuit is to be 1000 Hz?

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