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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. pcpe3rixt9r8.2u z(5abyyf 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;(nqx+m7f ahfs zwt idzo16*+ 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 wire2v+ ;ktn 65b*waix 6boz l3gf9a +hpsl in a coil produces what kind of change on th3xtb66svb oa +zhl fk2wp;l i*a+95nge 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 magnetic field through a loop of wire pr+0ap .frf:n 3xc5qr:xvxx78gsu: mui oduces what ki vgr0xpx.+r8fq7imxfuas ::x5nc :3u nd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of c5n)l9ljd808m hlto an hange on the induce ml nd09l8a)nt5j 8ohld $emf$, 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 fixjj *hs5f0a x5eld 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 conductor will/ot rzswwz mtq,q7i2mm 0m7/8 7w8tmw q,i0/qm7mzrzst2/m o be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizox9:0zbxi0d -qr 6ohquntal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from:d bx 0hi-0quo96rzxq 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 i,w2izhd: j3rh-;(ukmhq2tje s held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when(q,2zh ekw :r3h2 -juj ;mdtih 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 tabl1edbd5(e9 e 09gh jvrbe top in 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 in this coil as 1g9 b(0dreebhev 5d9jthe field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fd-43 yiunp+eepg+- cyield vector points straight up. The magnetic field suddenly grows stronger. n+deeg y4-+cu3p- ypiWhen 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 wh n 9j+55sfnvq9oc 2up1iw x.mhere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current5nqnmfp o9siu9v c1+ . j52whx 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 f 6du7b7mws,pa7q,m :jj e 8egand carries an ever-increasing current northwarm f,q7jwm8a67 j,pgub7e:d esd. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enteringxd,.x oy7 6yxgrw9+w6xthse.z 8l0h s first. As the north pole enters rwo.6x8e +txyx dhsy z9g.wx6 7hls,0the 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 z ,ly)/q0wd7c9xrklpangular 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 x,wk9qly pc /0d7zl)rloop'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 constant angulm)t/d h5+e oglar speed about an axis whose direction can be varied. In a region where a uniform g)+m/dt e5ho lmagnetic 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.axl+k3v) looqq 90m(c
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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 t mhjr)/u4d0t5olq 0k fhat 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 magn phy8/ff5a a vn/6dd7)rbz *byetic 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 in the east-west dir i1v.lk7nz f3o-l tbi8ection) is moved northward at constant velo8tv of1zl.i- b ikl3n7city through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloe57/uu gcx h4vcity $\omega$ 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 8 9pjnvh-hn0ccwqc09 transforms

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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 revolutionsv7i(f vi:xb c+ each second. The frequency of the7 : xivvf+cb(i $emf$ 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;ufu)/5m)g- dtkyoei 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 that ldl3w2(jwg +l

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primaum:zppri+ x; yq8a.uof jwv)s6, ( k,ury coilf)(+py6w k.u ;umz, i,:r8ujvsxa o pq then 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 the primary coil contains more loops than th7 *y7zbnp*c5ekq pv-e4n fji8 e secondary coil then it ij pk ypi5z* e c-efv77b4n*n8qs 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 zj*: 6 .ljvyn3(g k9gwuxh:sa;zi1sb 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 resonaoej3 d,i)9rrz lf+qq3 nt 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 an ide pulqa3/ /lw:zl3ca 7tal battery of constant t/7l cw3lqa /a3p uzlt:erminal 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 ideal battery of c*xh:qh d 9z aw5v*kk8aonstant terminal voltage. At the moment contact is made with the battery, the voltage across the inducto q5k*w8vzh:9*haa dkxr 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 an25z xtrpg9ue ptd/9uel0oze /oh.j*2bxz2k 0d resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conn-0 m7dbuh u,gsi c8pf1ected 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 serc500 cfky-vt eies to a battery. The time constant for the circuit represents the time required for the current00ktef-yc 5 vc 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 yuhj vh,;o n 8f-.unp2in series to a battery. The battery is suddenly removed from the circuit. The time constant for of nv n ;o huj.,uyh8f2-pthe 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 have the same/n nhz86hec wz(bb+ :f 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 thidd1 :xc4(jk q9vl ku.jjmt8/cs circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuwao+4srtkw)tz(:8 zvh r lj,(it, the current 4oz( w( ahwvr:8lj ,szt+r)kt

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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 ch49 ud kugsel1 7a(w1in1j oo/panges by what factor when the frequency isojn14pkue11ag w/ o ldius9( 7 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 voltage across an inductor is doubled, the inductiveuky*iof .lx( v kp 9x:rn5454za*fzct r59kpx :zvf .*y*xatf coku(544ilz rneactance 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 across an inductor approaches /mb,pd5b1;l8 2fzbh;xpfxdx zero, the inductive reactance of that cplb;8 z2hx 5xpfb x,b /dmd1;foil

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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 udwc 8ri afga3.o,t, /circuit, the current,a3r wtu f,.cio/dag8

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactav +g:y7dv9x,utm y)uance in an ac circuit changes by what factor when the frequency is t atx)v 9v:,udy g7+uymripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the ca7o 5gv01lwlr qm1(o/txmlg4lpacitive reactance of m4 (wl mqx5lovl1to1g/lr0 g7 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 voltages of the inductor and capacitw+f ;b,txpo )vx s0b wl-gk29qor in a RLC series c 0xgtfwoxv ),;kw lb9sp q+-2bircuit?

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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 -8(tcy n m+pcgdefined 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 imw h.gk;lt65chgf2 4kspedance of the circuit increases if R increases. When is tsklc fw2. 5ht4k;g6h ghis 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 impedkrug;u6kt od1,th06) gc2y5 9yjyr d*-n fpe kance 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. l nts-v :0ncjl 3e0z)g k*7pfoThe impedance 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 do/g *uu:ofbvrue/9ly lpb+6i 8uble in an LRC series circuit, the resonant frequency of that circuit wi/ue6*riob9: v8l+ u plgu/fb yll

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuj7c/w(nbcxuf6ia 3 y *it that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occ hv saec;:e+-ygxoqfr0c*zq+ .a5x :turs 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 rotati4gf mo.6,(nebn; s2.;pdilgy*iv w p kng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arg. i26dewobm.*4kp;v(np,; fy ni glse 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 magnet-g,0 vg4jfjw qic field of 0.20 T. Find the m4-qj,g g j0wfvagnetic 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 rotating in a uniform magnetic field of 0.20y krfpbj68 -d5yr9gb3 T. Find trg b856dykb 3r p-fyj9he magnetic 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 h. .lm bgevpv+.r +cr.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 chang5ryz7 2zk3qefes 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 with sides 18 cm. 3 9cnavmw20 np4 2x*1h jtlf /pl8awmsA uniform magnetic field is applied pe1tca /3lnhpwpwa9l v2n2mm4s x 8f0j*rpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value 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 f+ czo1e-ryfm+ n g4c28ja.ljarea of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns a v5bt-b*9flpw 2.x wnind area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wh-9ui897zu ( ia skh ry0*oggezexyo )9ere the downward component of the Earth's magnetoize9u -ya gro8 yiuk(*sh z9x97ge 0)ic 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 angular velocilhm *2cu6z/,cpw q3- 8w/ofjcz5l abfty of 2.0j, 3wb 582fcm o6aqzhcwf clz/-ul* p/ rad/s about 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 loops and a crcvgr( rvy63l: oss-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 )0vfcy2vjnj s2 w. g1d100 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 rectan :(4gbqp8xjw; bp guk3gular loops on its armature. Each loop is 12 cm long and 8 cm wide. The ax;3bq(pbgj8:p4 g wk urmature 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 consists of 100 turnsl, roet;dlm whzvmf.e (lu2e:l592/ n 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 genei997 + j;oe //h)lre.vt mrie6xo sdfmrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the atro .d+ser h)i m9vel69eo;fj7/x/mi rea 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 maxiq*wz gz43ic6z 44/sivx vw6nbc +9qslmum $emf$ 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 +tdoto6:2 qaca resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. T6m3twz*aji2wwt p y6 5he motor operates on 120 V AC, and when running at full speed it gey6 it3w wm5ptj*a2w6 znerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is con pzcl5 i4cbc7vl0,qf 0nected to a 24-V power supply. The operating current is 1 cl4f,zib70cql v 50pc.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 internal w8v4i y4ofwqfhglw(zdd4 87( resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full(zf44 w7g4woy d fh8wl (dq8vi speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resis/lvn- 04g zf3 ifsmc0otance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What v/s04o micg0-nlff 3zis 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 r hhn1 tgt,u7/nb55ya reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformegvqhe)9r w 4zmfhm)tc7,0/tt r causes 14 A to flow in the secondary. How many turn) ,eqwz04 gt/7fmcrhv )m 9htts are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary inf urt/ma6ldxvdlyhl 3884+ f0:lo hm0 a 110-V primary if the 24-V secondary has 100 turns?6 h3 dmrll0:ufoyd/ 8lal8hv mx04ft +

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and o2sq7axuth2.e1w:m,k kj a sck 9z(b+ a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primarym9sb+x:a2a(ck .s 7to2,qe uh1jk kwz ?

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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 tqw m t 2qstg6fo596zx2he primary of a transformer. Assuming 100% efficiency, how mat6 q295z2tsxm 6wfogq ny 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 neon sign tc,k vgk3f6dn0 ch7d -94h yiferansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the cgnf4 vi3fd9k c,h076dy h-ke 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 its sd;qlo++ko v ,yws61asj(yauaa p9-w7econdary coil. If 120 V at 2.0 A is applwp(oay9s6,-;sy do+ lq +auvwa7j ak1 ied 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.uq8 n/yja f()7:p.kfnzt xgo has 60 turns on its primary coil and 300 turns on its secondary oagqzfptu/: f)( nnk.x 8j7y.coil. If 120 V at 2.0 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 turns and its secondary has 200 turns. c5o/rp,g tys0If the input current at the primary is 100 A, we ca0s /y,otprgc5n 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 1000f 90cyvx )jbu turns and its secondary has 200 turns. If the input voltage to th) yf0v9b0jcxu e primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20oa7 t:rle rs 36kr(w1:oeqxw)0 turns. If the power input to the primary is 100 W, we can 6or) ksoeq r:wr 7l:atwex(13expect 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 voltayg, t7zstdy m d3q+zhmi5 529nge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the sec+z5m 9ts5i y 2n,qy7td 3zgdhmondary 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 current at 120 V. The voltage is usual/4ls,5lp5wlfq 0*qgdeyw7 gzly stepped up to 4500flzw sdl gql 5gwq5*7y0pe4 /, V 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 120 V. The voltage is usuallx*vc(.)bon /wb0va /wfbe vj3y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission nb( vfw / )03*cexbo/.bawv vjline 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. 7e5y ;opzi;lq A generator prodq;ylopi; z5e7uces 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 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 kmq7)wo k2ep yz6 long has a total resistance of 0.60 W. A generator produces 100 V at 70 A.p)wzk76 y oqe2 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 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 ;. 7oqexm-tde6-W line at 1000 V. How much less power would be lost if the powt;7ede.mx o- qer were transmitted 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 25w)j lf 9cijk:0 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the poweri9w5jk: )jfl c 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 sttl1dk8 e6 mlq6ored in the coil's ma8 emtq1l66 lkdgnetic 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 6.01hmg 65hl8ek d-W resistor and an 18-H inductor. What is this circuit's e15hklgmd6 8htime 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 w-so9;a qh oo)xhere 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 120-V AC oujpmb3 .e(h0v g7j0h vf dm3g+ttlet. 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 o/a4bzsrq6a60 passu* f the la qa*/6as4sb0a zrspu6 mp?

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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 a3y*s w; *4xjcxoby 0az 120-V ac power supply. What is the peak current through the* aw sojz*ybx yxc;043 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 supplos nz.n)4* tgp ck7l(wy. What is the power dissnpnl*tgzs (7o4c).k w ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 58/w)yj qloxe/0-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 re;g 85g l-c10vh 6iwzc5zs1ufz6tq kqssistor 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 resiskq,47 fg ut)d-qxgv4b.3 mdxetor 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 at 60 Hz?povqwz/ yln1 at- b913

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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 4a j7s2nv8c-2eal 6 inpsrp8b su*is;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-szlvct6; x,s df.-wq8mH coil 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 xw)wyu-mqtgr s 5j6,9 for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows i945wiqv tp.oq1u;:bw d fntw0)b qel,n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applu 5w9f o)vdb;p q:w iqw.0 nt41ebt,qlied 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 throug8) 2ufvispe s3qys3 l4-onr;vh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 7i(bc.ih*kq4ohxixt * .9ej,bve eh2 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 reactq70gn p1t/p 5rhdr1tdn )wq; hance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ,1/ -t. nxn6e *ugnutu(sbnrnof 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 ca/w(wi 6y odz9tpacitor be 100 W?69ww(dt/i zoy

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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 0ots; g2r hm*;o.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,b n9ma+ 4 +pp q ,hirme5/qsh-oh*sdj2 15.0 W inductivoejmq+pn r,-+h4h/s 2p*sa m9bhq 5ide 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 imped vfwiud4/4 k1dance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected inf/d 1ku4viwd4 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, x 5sfl 4h;xmhro 5l:3/uogzv3 20-mH coil, and 1.0-mF capacitor are conne4s55z llxvu:3hf xo 3ohrm g/;cted 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 tf,z b5:qwsz* p3p*ct) x+ czl20-mH inductor, what is the impedance at 1tzwbx3pc q* sf+:clz,t*zp5)000 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 conneb vdmm/7dr( i/cted in series with a 20-mH inductor, what is the phase angle at 1000 Hz?(d7rmmb/d vi/

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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 coil and 1.0bg+( k 6ogjv7vde0qf3-mF capacitor for a total impedance 6vojev73+ g fbqg(dk0of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W rern:gd/j dv(cx h.2(g etd b4r-prl b6(sistor and 15-mH coil to get a total impedance of 110 dbgl(trhbd.:vec/-6r(dpjn 4 g(2 r x 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-mfk6gr+5:v d m0 nl(0jo:iqwt91orz dmH inductor at 5000 Hz for a total imp(nwrrt0 fgm6 9zm:0l1 jikod5 :vqd+o edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistkk ,hs -lxuh k1 0n :joi8h45*tqy5nubor at 1.0-MHz for a total i1uojki qkt8h -l5b s4,y*x:u h0h5nnk mpedance 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 capacitor. What -h7)elbnmb llr 12 0szis the impedance alzmbe2ls1) l0 h7b n-rt 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 s nyi7wbd: 26gzeries with a 10-mF capacitor at 1.0 kHz for a total :nbwzdi g2y7 6impedance 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 a phasnvnyxo3q :6xt;f4w w.e angley;t w43 vxxofw.6q n:n 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 nvfd2d0 dz)3fxn(3v hh eeded in series with a 30-W resistor at 1.0 kHz for a total i 23f0fvhzx3) nvdd d(hmpedance 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 awy5 wc3fzlei /v. (p.mv.udn7t 120 Hz. What is the phasey( e cpdz.v.iw 3/.lnv7fmwu5 angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz iqsml /6e 2:u m,vod.4e uf r)v w24)kaznuqim/f a 100-W resistor, 20-mH coil, and 1.0-mF cds4emq2rz m/q v4k w/,fo:u) im a6l)un.evu2 apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W,(:u (g,rf 7 izndnhe1 ssirn7 resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suph(7ni,z7 g(,iu s1frnd : esrnply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductr q3x; kxrk;1w,ud8sh or of inductive reactance 30 W are connected in series to a 110-V, ud18w;rhk ;x q3xkrs ,60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W r3kvsk-48lsmwk;d iq 6esistor, a 10-mF capacitorkwk ; 3qdv8i-ksl6m 4s, and a 0.45-H 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 fo;99zdnmx/ f+.w2y llshi.yf t)tuz/o r a phase angle oftf2s;tfw9 9hl u. /yxm+loiyn/.d z )z $40^{\circ}$ 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- 0+xk tox ehjy;mgq3v4t6)6wnmH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power traox0n m46 hwx6g);q3 +tky vtjensferred 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 ac3hi0zp p2k-ta: ss biukw;/2y series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit i0uzys k/b3-2pswk;2:a iiht ps 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 cir5yrk ,s7loyc.ty*bx9-4s lj egm jyu/;n, z3scuit 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 resistance of 30 W. 6oa-07 ,, *j3ssylfp:wk0 m gwfoaevxWhat is the power factora,wmjf,70*ko: fpvegyss-03xoa wl6 ?

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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 factwy5+6l.ns ecv or for a series RLC circuit containing a 50-W resistor, a 10-mF capaciec wyl6v+sn. 5tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coin3zdi3 /e8fd8;twy gp;fe z:dl in series?t3 p /ed:f8fzdd38;n gez;y iw

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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 for a rex 0cw : zhbdikh/s:wn(g0ro3:6 wg3fosonant frequenc/ wo cob:hw0(h ixk 3r6zsg3w nfg0d::y of 10 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 frequw s1vm 39es93gol4vt uency of 1000 Hswtu9e9l3vm4o1 g 3vs z?

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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 seriv 4u.b zan*vs)es with a 30-W resistor and a 40-mH coil if the resonant frequency of the circui*b .z4aunvvs )t is to be 1000 Hz?

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