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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 ar.zi- tw v2n lg.qrk;d;e 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 induction states /g 6 nmgfhr7l7lkz:m p:le.3f that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changjs80 mi21b j;mm5;ot:kd vfwie on t 5jb;ks0mimm;d2ij1:w fo vt8he 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 magneti of6l9z:r :boxc field through a loop of wire produces what kind of change on the induce zx9lfrb: oo:6d $emf$, 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 a3 nw9 e5- jajqztqai7dak -.v p.0:ry*8ul qsproduces what kind of change on the induc ivuwakq r9 .-5a3dezp: .q-syqal 7jna*j 08ted $emf$, 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 u,few 3r h. 32aw 8dabkasi*b5from 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 direcpa1d;k5y,sse tion of an induced current in a conductor will be that which tends to produce which of the following effects p5 sye1,ka;sd?

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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 tablnpf:16m/ abrac72: j*c yfxgo e. A bar magnet is held above its center with its north pole pointing down. The stationary magnet in7 o :6xapg/ yf*:mrc2fa1nbcj duces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a( ,/ vus.qc0eg.l rw8y rpyhp7bove its center with its north pole pointing down, and released. rgh,p /.ly w7ey8ru . cpv(qs0 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 inqpwus*k d 9t-q- ,q+blvty1 2s a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current -ttkb9yq*1+q -v dq pws2l ,usin 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 t ljb29s.p , *wtxscqk+-8z puwop in a region where the magnetic field vector points straight up. Thw9p.l+c-qs sukb*w 2,8 j ztpxe magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the mag b/dw wpa.o+z 3 p5agge4t1qg7netic field pointsw gaz .45+b p1gtpdaq7ge/3ow straight down. The magnetic field disappears suddenly. 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 carrr 1mf3r)9mqti a2jtn/ ies an ever-increasing current northward. Two coils of wire lie flat ontf9tm1/ nra3qi m)jr2 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 thro/q; awxwau-yni-qcg4) gn d8 ,ugh a loop of wire with the north pole entering first. As the nn);,q d4cuwq -/ 8nxigagw-ayorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed :re)o:tl(ns(ah . ew(vtfe(c about an axis whose direction caf:(.hc )((seat(weorv n etl:n 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 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 isv1wz - u)vgy0+ m1qzmz rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotatiov z+zgz)yuv1wqm01 m-n 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. rt 2ua1fv:a2d61d6z0kavbw m
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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 4( qa/i+ br9wm*pn apfthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. q fa x54 j4jq6+yq+jluThe $emf$ 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)o*zl2gtz3qu i9-d5 v dsxy00e is moved northward at constant velocity through a magnetic field that points straight down. Make a statement0* ozi5s dzt9xylevdq 2 30u-g 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 angulo , u jn4wqzlydn-:d vy,f7w+3wct :;yar 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 trx vk2su u dgl*ch,v(8b w-e hxn do.h9v1eq:7)ansforms

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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 seco(ufh)m;vf)e m,dg/ o vnd. The frequency of them;v vof )/gf,hdmu() e $emf$ 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: 9/(x)pqz2a+oa c trexyvb 9zm/8 fvc 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 thatnk4e . qeric::6q.g8a lua wr4hs0fr1

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops t7swg4 9xf-h -kquo pnjv:c6-hhan the primary coil then it is ac nfs hq-g7-pv: 64k-wouhx9j

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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+) uuqkytg.45ickt +h contains more loops than the secondary coil+uyc k.+ i 4)hqk5tutg then 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, th v927qr/h lu/ujp7dbn e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuqvk 3v7v(fj; ait,

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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 ceo,7u9zmhrpac9o)9v y u +zd -bwr 2c7onnected in series to an ideal battery of constant terminal voltage. At the moment contact is maru,z2wveuoa99m hdr7+ pzb7 9 )c-ocy 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 bawkgw)ohupl467/x (8chx9 4cjlh 4hqjttery of constant terminal voltage. At the moment contauh)col4/xkg8h9(x p4q wc7ljjhw 64h ct 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 Rj+* i2tay xuiv: w;gs7 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 a)c2t3/gr lmntd:: kb*yxkwq5nd 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 cou 81 pz tnkh)q.;oz+cennected in series to a battery. The time constant for the circuit represents the time reqc ;8k)t1pznoe.zq uh +uired 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 series to a b3g .tpedr29 evlu/h5jattery. The battery ispugre 9dh5 /2.levjt3 suddenly removed from 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 hazoi46ykg ya .l; x,p+hve 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, the currnzbu.;.g i -avent

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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, thoblsktte;ht6,, e qk,n.+.che currentk l6,e t nh..c,;esb+,qthtok

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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 saato4e *;iy:t changes by what factor when the frequenc*: ;4aoaetisyy is tripled?

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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 voltag6bvma zml;d.7 //cdxg2g 54s uqlioe7e across an inductor is doubled, the inductive reactance of l/s6g/ 2dbzo4x5v.gmu7 led i m;a7qcthat 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 approaches zerzf 3ra3qp 57p(zg)g,w le mah(oebu.gd7 s:n3o, the inductive reactancel oa ,fw3u3 eprmsgabeg 7)hqn g3:d (pz.5(7z 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 circuit, the cule56oj k) wbr,rrentko,wjl 65e rb)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the f*wq+( cxjhup99h b)kx requebq+h *x k 9hx)wj9puc(ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacito kp0zyhx3t+ hf;m4d t,r approaches zero, the capacitive reactance of that capacitot+thhy0 xk4,;zfd3mpr

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the poy4cloy (m21 inductor and capacitor in a RLC2 pc (ylymo1o4 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 an RLC circu.;gggo8 x zz)qit 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 imped x7 j+xaj dk/j;jva oo(8,xhj9ance of the circuit increases if R increases. When is this statejaj7/+ax ox ;o( ,jjxvkh9d8jment 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 circu pdbq4:m/9eug it. The impedance 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 i ta- -ww3qxru;gf (w*rmpedance 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 capp/75zpd;(:om3e;o8zr smnh 1nd y nkj tzq. k0acitance both double in an LRC series circuit, the resops n y;j/tpq :m rd3doko m08;5k1ze.7 nhz(znnant 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 voltage. At resonanc 5ja6 ugj.f+ sqpn+kw*ws98boy ;cy6w-udjh.e,

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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 cir:1irs8q23s)z ao zo vqcuit 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 rotatingi sj/ y)ydehk +y73xm) in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wekdi3/hs)+xyyyj m )7hen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of ng3 lj1r6vah,e1 q6qc 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi1vlh1,g6cq q 6ejna3reld 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 radi05g:u;/f bj +tw vxk y*7ygday2 g,hkkus 0.10 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 thu/xyt;k+vg *jgwa0d7, :5 g2bhykky fe 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 adjustabl7bigbue4*s --f mnh+te 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 changj 33p0 jcsdpm7.jn:fd es 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 wirebu v//8m+ wk q7crv9qlkye0i* on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 ul87 r+0bc/imy/ke q 9vkw*qvT 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 an area of r o7zzwl+butl2zwu 05 ohh-0rn),p :e $0.40 \; m^{2}$ 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 nuh9c eap,nenz) )n5 pew4*5g$0.20 \; m^{2}$ 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 thekmjg- it c0vm+7q3d 5g downward component of the Eartmq+c i7kg5mg3vdt j0- h'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 angulhsd5z8jw vyh3w;) 0zlar velocity of 2.0 rad/s about a vertical axis through one of its end3)jzz;ws5wdv8hyl0 h s 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 genera-b)zhpv,,qp l4 wdvv-tor has 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 100;htct- hj a8in1ez d*6)zp)za 7 xiv0v 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. Each lte0k r8bp q)mvj+x yed;4 xa-3oop 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 be the maximum output volt 8x0mvak-e+qr;3x j) bpe dt4yage 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 mxoi/ 1 nm56fk100 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 generator with an output of yv sfid617 9bt12 V maximumy6s i dtfb9v71 when rotated at 60 Hz. A magnetic 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 generator with a maximum l;jy4gs :z: hj1an(5nh kqp6 s$emf$ 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 opw.4vn6o9 mwl c81y4n;ppq pgmerates 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 6.00951s i5,yno ss432 cf2p buxia cof)wu W. The motor operates on 120 V AC, and when running at full speed it generates a baci5s 3,5)sbyu cn 4fo9uwsa1o2c ipf2xk $emf$ 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 p5d sz8,uf6y zqower supply. The operating current is 1.0 A. Whafd z6u yzs,85qt 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 connected to a 24-V power supply. T (88 y8ozjst9 ms:img* *zforyhe operating current is 1.0 A at full speed. What is throf 9 s8mm8y i zo8g*:y*s(tjze back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sdw n1 w 20zkokn266zjzupply. The operating currentd6 z2nkz 0wkz61jo 2wn is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pudc 0fjx/2 .gzrimary 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-turnuohbmq -v *3 k9z qj)+j(*ebsf primary of a transformer causes 14 A to flow in the secondary. How many turns are in the second fhu)*s -3joje( mqz9 *b+qkvbary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-.bnz*u.peh. tx19lm c/te6dpt w 5zs /V secondary t*ul6p/ep z .n/tcw mbs91ztexd .5h.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 cohu:) ut1g 5feamag3w1il and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thtae :3uh)gm51g1wfau e 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. Assl( q.*mj sda/xuming 100% efficiency, jx.alqm d/*s (how many amps at 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 neoke07 8o;vkxb spz:jju(c5lu i,pc e 21n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the privejblo(xj 8uc p ,257 ;kike:z10us cpmary 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 4z v v-:kdk3aocoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prese4a :d-kozkv3v nt in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i9kxwvx bm8)illl- +o8ts secondary coil. If 120 V at 2.vx9xw lb- i88+kol)ml0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuf/y 93wg -j/.5rmocxgdsc v vlv8:d2i rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the second8jidwslv/x mvf gcc.d9-g5:r 2y /3ovary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu8ago wdg8b uu(g)+ oo+rns. If the input voltage to the primary is 100 V, wegbau+8g+8o )uo ow gd( can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaryyzvo jgo4 *9sm8d,b0e.amb( v has 200 turns. If the power input to the primary is 1oy8,mseab(4z .o*jbgv0 dvm9 00 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+fbo+nktb;dbw6r.kl/, t 7 zasually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tur 7dlt;w, b6kztrbk.b+ /aofn+ ns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of bed:ttk+i:oh4* ) w+6tei o hvcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer anhbh)6etd o*tt+4eoi:vi :k +wd 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 120 Vnfse1cp2+ai 8 qutefa/d7 8z5. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powe+t1 5su 87ee ai2zpdnc /ffaq8r 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 lifx5 er)el ik5ao- u4gqgm 9(q7iaj5c4 ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy losu4 axj-9moek(iqel54ai g rc57 qg5)fs 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 were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resi,a ukqi+bzn f *pfjlx)3chy6+70h6rkstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce e6hf3* jfh+u+,6ayq crki0p zlxn k7b)nergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost 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. Hx. :jmx.5w0 +n1 gruryaz miz2ow much less power would be lost if the power were transmitted at 3000 V in2amx+izn u: y0rzr . w5xjgm.1stead 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 a2 3cgt0x afl02/ygq af line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission gg0f3tal22fax/y qc0 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 stored iculs)1b dzv 95n the coil's magnetic lz1sdvu9c )5bfield?

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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 inductor. Whf(wa +np -.ehsat is this circuith .a-enp+ sw(f's time 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 v ccit.:3u, znsoltage 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 n40xg1(dkvjbh3w7f n . 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 resisfo ma aeo*8c5 bg61b5jhm1f 7vtance of the lamhf6cj178eob5bgfa1m5 a* omv p?

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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 covd 9stb4z 9oz ( u*hakxq3wq3(nnected to a 120-V ac power supply. What is the peak current through (xthzoa9vu*qd w3s4 q3 bk 9z(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 supply. What ib4vh*l cpft )e4h*(ea s the power dissipated in tvhhl4* a ebt 4ce(*p)fhe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is*lh:gmsf t )im-z )+jc $I = 0.80 \sin (240 t)$. 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 651aapq c2gzwa 50-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 a 50-W resivzf4,w +yf .fqstor 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 reactanclr 1/darks a+i-*0eige of a 1.0-mH 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 reactan5g wk39b2+hfo2fs juv ce 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 1n mo8vc7 m:mlcoil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive r tga// akk,1 ojm93w4bbvat (veactance 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 at a frequency of 20 kHz7q9*rof2 6wja0mp h j9iez8tv)h k2se is 9*0jpqek m2ow v9) 6ziesat8f7rhhj 2applied 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-mH coil d yx(-+x(c bamzue 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 cax)4 f,0 wsprfqzg1oey cl.;6hpacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10n,x xj41xs9w1 p) z9bbsic bo) 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 t*vl mdl 6 d0uthz:s5z3. f7ppof 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be ij;7f+u :d/vq;z en ak100 W?7 +f ;k/; niavzj:dueq

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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 v0qy1oyw-:+ fz pp ,gmthrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W -dj 7z 8wi1fuzindz8 jz-1u7f idwuctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0- 2yuow9 01 al(:xc(nfj*3vxmfj4m zz cmF capacitor are connected in s zvx0(j*u4yfx9w2m( mfocza :l 31njceries?

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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 readqrvqq z4c6kz*cx + 1f()8g b1h ekl)sistor, 20-mH coil, and 1.0-mF cdr qa kcgb) z z6e8x(kf1c)1vq4qhl+*apacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thn/qkmzv hti 2,z 33u(7ls7kkhe impedak/ s,kz zqu (hk2th37nim7l3vnce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH *d5)o dz lxj. yn3s(hp0uxlk4tp38 ltenq*g, inductor, what is the phase angle at 5,) kdojd lg.l83ln* qsptyt4enxx hz3u 0(p* 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 circuit with a 20-mH coile y.q7 +no6wkbchr+m; and 1.0-mF capacitor for a total impedance of 100 W at 1500.yr qk ohe+wb7m;nc+6 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 sa yk3a-+e5srin series with a 100-W resistor and 15-mH coil to get a total impedancey5r3a s+-kas e 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 seriestrtt7.3ztbl t7y4zkv v0) , xx with a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wz ,4kvt tx)z.lrx770ttvb3yt ?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 0qy),is q 6vgu1.0-MHz for a total impedance q q0i6u)v,ysg of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitorx2sk hs39gm x6. What is the impedance at 1639ssk ghx 2mx000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for1nwwln h4ef5( a total impedance of 45 W?n1ef5 4hn lww(

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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 s p 7 e.ej/3+h+q 7xqr;adolnsceries with a 10-mF capacitor at 1.0 kHz for a phase angle of7ql ;rcas /3pe.d7jh +exo n+q $40^{\circ}$?

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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 se foy2kv- p8 3vp atvyme6:+cw/ries with a 30-W resistor at 1.0 kHz for a total impedance of v v-y2:k8ya6w3ofm/ eptv +pc 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 cap/o9wj d7nrr,3vd ukx(oe22h uacitor at 120 Hz. What is the phaw(ur/ d22 ooduv7 x9knj3er,hse 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 t7 v dufbdg33.njr a05Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?3utbvgnf0adj7 35 .d r

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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 1j4)ax rxo659bmm du . 97udjor0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-x)b omarod.7 u4uxm jd9j65r9Hz 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 re3uko f. r 7youwm5:zaig-vo09 actance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60owz0ro3igu5o. - :v79muafky-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cir9 h.tqgv9h a8gcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a.h9gtqg 9v ha8 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 res y)hqvhu *psl f.2t/q2istor for a phase angle of uq/pq vt)yf.l*2h 2hs$40^{\circ}$ 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 = 10.0 mF. At what fr7 88fjhr 4lh 97 t)bw 4xye8leqi6crvrequency should the circuit be driven in order to have maximum powefiwe87 7x ycvrhblrrt4 j4eh)98l6q8r 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 an ac series circuit with 12.0 W resisd/zi,;e4 /,u85ox u biqlpcm;w + fqvntance, 15.0 W inductive reactance, and 10 qd/vnu,;w/ zec,flb8 m+oi i5;4p uqx.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 AC 5l,baihb,5o9 inxf9 y 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 han .s qewgq4i)7s an impedance of 60 W and a resistance of 30 W. What is the power fa s.qie4gnq7w)ctor?

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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 conta/as4enaeh8 gz) 3y5f vining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppens/ fa34y8z5ha ge)vly?

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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 1 :n14 qhculom+ vq/j4s5-mH coil in series?smq1ju clo4:v /h4 +qn

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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)2:/jcu(q vf 0 h..yrfheqvpo, tycp/.7-mF capacitor for a resonant frequency of 10)hvp/.hev/ 2c uy pq:orcjq(ytf .0f, kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fr geu.o/td,witkir3kp.7l o2( equency outdt7r. kk ,3egpiio l(w2/.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 re d;(k/1)lfm ptsc1c fept5r)jsistor and a 40-mH coil if the resonant frequency of tt 5pft kpc e(/))fj;d1lrcsm1he circuit is to be 1000 Hz?

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