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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 apnaq/(bax4(k re 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 sta/jqy.i+ga a* ux)r k8ttes 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 changev/x:zr p fx+iji0pl3; on trp3 iiv;+x:z/ xlj0p fhe 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 wir50/ o0fyjsxsv e produces what kind of cs05sv/o fj0xyhange 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 lookkgy u(lg :3/tp of wire produces what kind of change on the induytkl 3u/gg(: kced $emf$, 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 field anoai7iutxqz elf 22db ,7+(a4 n $emf$ 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 .dx3cjo1wg u8q7+ n cvdirection of an induced current in a conductor will be that which tends to produce which of the 3+ucvd q1wog.x87cjn 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 tablehh.m7d7jx zu)g xn 3bt-l1r d3. A bar magnet is held above its c3jxgu1d7 bd -z )3.tmhxrnh l7enter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tathh x(yuu2*w /40ywm eble. A bar magnet is held above its center with its north pole pointing down, a0yy(wtwhuh2meu 4 /* xnd released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region wo fw*6o3)i ghyj;e:b ;jkfl +jc)f/zb here the magnetic field vector points straight up. The magnetic fieec )j6 3o*:zkfbfb+;j fy ;gi/l )whjold 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 a level table top2fo9i5qgsp l9 6.izky in a region where the magnetic field vector points straight up. The magnetic9.ygzi65o qfpl2k 9si 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 in1jcl g mj+p6t; a region where the magnetic field points straight dp1lctg;jj6 +mown. 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 car/v*coip kv(mip,kh-8tzpcjn b , (x23ries an ever-increasing curr bk 3ch,8ptk*z(ii,xc(vj/ p nm-opv2ent northward. 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 norzde2 z75 +bogbth pole entering first. As the north pole enters the wire5dbo z2bezg7+, 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 about an axis whos(b2(tdyx : diie dirib (t:xd2i (ydection 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 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 an,jlf47 sjep.s1r8mkx gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points x j8,fe 14k.rspls7mjstraight 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.rh 8dh g7qe03w
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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 a gfc ;jy39gbi3mtoq+4 n $emf$ 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. xa/ 5s6e t ea9d.8 izg9x ne.p2ebro(yThe $emf$ 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 directa2c ebfz7n3o5 ion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concern c3zf5eo b72naing 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 rota ;ahgnk9(,5hc 3 u(btrah/c uktes 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 t *nznfuraoo 9a536 qq4ransforms

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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 r,uci/yy*7s 8ozb v :ofevolutions each second. The frequency of thy7y/,oc ous8:b v*if ze $emf$ 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 usedb qdc jt +s0dz+t ,llu(c-0oe: 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 deviwjn0i sc -0cy+ce 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 contains more loop.8pb4qq av y8es than the primary coil thenpvqy4a .8bqe8 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 conta)yebo.+qub cxr a6 xyxfr92f*-lq 0u *ins more loops than the secondary coil thelf rx )yfuuax* b0eqx*q69y.b+-2rocn it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power in8csh5 yfi;. rwkh+0p fput

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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 resonax*y dqo+kgo 6chn83a(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)cm9exthv2qc; :o ,yg connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volc,g9;xc 2 qm)tvoyh:e tage 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 coi ijq*- j)5p/kxe,wqxnnected in series to an ideal battery of constant terminal voltage. At the mq/jipkixjx 5e)w-,q * oment contact 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 an c05ymu umyi :+w(7ob *eljse(dxyo*4 d 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 wi3lfzkp8 y0z3eg2f)yoth inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 se:9mhek hk 4)mnries to a battery. The time constant for the circuit represents the time required fok hm9 mhn)e:k4r 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 battery. The batt3t- pbir1pkp 7ery is suddit r7p1k -p3pbenly 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 have the 5.1kax y*gccgsame 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 po9(unijw h zm:)wer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curren 9fuxrlu)mb27 t7m2frlbxuu) 9

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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 factop+n at84xfxx +r when the frequencyfxxpn+4+ ta 8x 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 voltage ac22 vbbr: xxijfu0is2nqr2:prl8;sn ,ross an inductor is doubled, the inductive reactq,xv20 2n2sbj:xrl: i un;spifbr82r ance 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 sw7 lw74uhq pt,lsi83zero, the inductive reactanq 347tw7 ulisw,pls 8hce 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 circ:wngjso- r7dzd; r mo 8.i92zmuit, the current:-r sm8zminwr7do 9.dzjg 2;o

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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 ac7 .sk0x+2uror)fwoeeblch/: j m*g j* circuit changes by what factor when the frequency ijx*b o wr)so+j/m h:l*2e7 .0cefkr gus 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 capacitor appr5y+)qu f fggh.*qyj (/x imt)o *xkf,qoaches zero, the capacitive reactance of that qq5o +/ gtyk muhffqfxg i,j))*(y *.xcapacitor

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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 angl/c4/i7hf-h zvlp w5pke between the voltages of the inductor and capacitor in a RLC se4l /wckf zipp7-vh/ 5hries 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 circuit is defined asjxjqnvw1 . nvoa5,(ypg3e x6:o38rki $\cos M = R/Z$, 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 impeov- fmp.y+gm6:c :x endance of the circuit increases if R increases. When is -6v .mpn:me+co :y xgfthis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit2;x ov 4fchsbmi-q. x8 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 impii3gm(ll z)vj 1-zsu,edance 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 r nis3s9h( f2aseries circuit, the resonant freaf hi3sr2n9s(quency 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 drivengkm(sdej9:44n e,oh2xbpb) c6 r :yz w 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 cl0o7d5w/0q hv* sqqluircuit 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 c cs4 otp ae5:0xhi2t1*.kwew rotating in a uniform magnetic field of 0.20 T. Find the magnetic c5pks2* .atie0tw eo4:1 cxwh flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rey96 e5 r:rwzvuy49uyotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when theree:5 yuu49yvy6zr w 9 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 dnx ue.: f3:azin a uniform magnetic field of 0.20 T. Find the magnetic flux through th.nz :xu :ead3fe 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 adjxj*x - :lv/spz.ush 7yustable 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 changes from 4, yscg)v,nxh $4.0 \times 10^{-5} \; Wb$ 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 turnssa;t ;.9ag7; ytrddtr of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the planrad g9 sry.;t tdt7;a;e 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 oajr+rxf6 een.a.x8; with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns andoh e(y1ue (qh, 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 horizontalhncaw val. ;4 d82 (8bczedhn9ly at a location where the downward component of the Earth's magnetic f8d nna9z;evl4.8(a2 hcwchbdield 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 conso/lf+dg3 d90wtc)h:w3fg m cetant angular velocity of 2.0 rad/s aboutf93/+wogwemgfd) :h 0l dcc3t 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 cross-sectional arc72 xwdp+xwf 9n o0kp( *bx0imea 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 k- zggb(r: / mizmw;)x;h3x/ bzukd/t 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its apju du icz ,j y1f 868,xhkery4m00qq)rmature. 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 be the maximum output vorud8u k0fxz8 j1,0qep,yi46)cmjq y hltage 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 10(cxwf05l,n 9dwstgm6a e)l0f 6r( mf)ce m7yf0 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 tu z+7nbnf k).zo construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A mazubkn fz +).7ngnetic 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 makifmdw vj(4*yv r4 ;yh.3nu/t kacg28ximum $emf$ 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 hc ( ezi r;mxps+h-m.6pave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motof lrt*b5h3anx,qoa: xp 6pj;-r operates on 120 V AC, and wh*3 ap5;pboj-f6x:n alq htx,r en running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 3j :a6 gyl6uggto a 24-V power supply. The operating current is 1.0 A. 3g6lga:guj y6 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 resistance 6.0 W is connected to a 24-V power supply +ng7.q .9npjisy;tp4ehc .ye. The operating current is 1.0 A at full speed. What+p7 npij94e;cyh .. gtyq es.n 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 internt 7m0t*twcx x+,td6yfal resistance 6.0 W is connected to a 24-V power supply. The 7+0xy,* t dxf6ttmt wcoperating current 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 primary*h(- njkk;nf*kjp 8wpx. abuy1lso 1* voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer cal 9 monqe;*k+huses 14 A to flow in the secondary. How many tlnqhk;me* +o9 urns 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 in a 110-V primar8op6 farw)qb/obya04 y if the 24-V secondary has 100orbawap f/0by4o)8q6 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seconphw ftq c3lr j)5*(j( iqrs(/hdary coil. If the current in the secondary is 3.0 A, what is the current ini(f *) jhhjqcq 3((5/l rprtsw 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 100x j3)huu, yrjt 3r6mlb1)xv4t% efficiency, hl ju,yxur )hb v6jt3x3)rt1 4mow 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 neon sign transformer provides 7500 V at 10w,- n5pofqpb1s+ ih/f.0 mA. The pf+-p1 ,ifh p wn5qbs/orimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer h2v4 mzgr .qqpf:;8lpcx ;z0qtas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what ;q.82 vrpzl qz gxm0c:p;qt f4voltage 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 w;/r 3zfykhy;/h0(u e0kevde its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is auw ;030yh//evz kfyrked;(e h pplied 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 r3h44spc wqx-i 8gvbpyn1 33tturns. If the input current at the primary vnp 4tbphr3wx8 qs gi3413y-cis 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 secondary (eo+. ft0ju0/x-qh alb,rltnhas 200 turns. If the input voltage to the primary is 100 V, we can expect the oxt., oqu(te n/r0ab-f0l+ jhlutput 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 t q,nla,zbela7 3ai0w yqks*+scew2. / urns and its secondary has 200 turns. If the power input to the *wbla, .nz 0wqisscae yk/2q+e3l7a, 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 Vbhan;4su81 kq;0ngu q.4c4pacr5 os s. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary hasugr0 k4su48 1hbas;cqsncqn 4o5p.;a 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 anortgbn2 3c yhftva2it1)*+tg/kc 7, t 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 lost in the transmission li a nt*7g)io2vt1y+nctfg3r kt2 hb /,cne.

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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 curre 8mi0ia(fpjds::l+ t unt at 120 V. The voltage is usually stepped up to 4500 V by a transformer an s:apfd( iul+8it0 :jmd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gt )b,hc,g8xbgenerator 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. x,b,h b)t8g gcWhat 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 t b3vitdmud6t;; y4 za2otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns r3d4t2ib;t ;d6azm uyvatio 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 transmitte8x9.rd*rod/t0lgf wnkgl *f *d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V 9nx*grd/8f *w. 0fkt lrlgdo*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 isj9y j71un1 js1riy 3zf 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission if 19sju ir 7131yjnjzys 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 in 1vkm1da grnmn92 7v:athe coil's magnetic fikam9:v7mgra d1n2v1 neld?

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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.d.i;ikzfb1g 0d j84 uv3,)hn 5kfzxaz0-W resistor and an 18-H inductor. What is this circuit's time x5z3 1iai0d.8 ,bfv;g ku4jfd)khn zzconstant?

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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 thgfa6/5mj( tgl hz 0ld1e 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 outlet. W7m w(wj2-o0 f7bye pnphat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the laysg*7mj+7s ddm l6kv5my mgsjkml7+v 7d*65dsp?

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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 ai*zcd g(p* et1 120-V ac power supply. What is the peak current through the resiszep* *( tid1gctor?

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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 co 6vawkan(l 1okuh;,zmi10a q5 nnected to a 120-V ac power supply. What is the power dissiphikkn,mzvaaao q ( 1501wlu ;6ated 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 50-W resistor is; -g v0,3wfmn no,aily $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor;wr*6yju wg v o66+0rvjq(bvg 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 mn 9f1oh-,osq 0zup. a8ie2b y50-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 tah:s o)t318cp-jqnb 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 reactance of a 2.50-mH coil 0dm4snovq(t;4z 3 c mvyv1qr;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 inductive reactanclz uhcgq17-w8 hl7ik,e?

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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 cr4t1uf-uuv+:6 3b y:9zo n rdx 1ibnurlt (;ninductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 1vtlkypqb1 5 ef,xj9v +hs boo.*y3q1820 V AC at a frequency of 20 kHz is applied to it* btkj,o b 13ev5v+q yshp9ly8o1x fq.?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz f5 ail.zi(og47(si az 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 capacit i ,k d*njv(24u knctqmq;2;nqor 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 atm- iwz8l 9zvh 0le 9f6-hun4eh 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 au c .1tfk jzp(0hu6g+p 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 4:z )nibf fk*z100 W?f: bz)4 kzn*if

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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 htnp0:0 xjdhib/np-w /arq5j9 v28oma 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.z 0jerzi1tg8(;yc2 qr5ymar .0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive re5i.ar2q0y8egrytm( ;1zr j czactance?

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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 resisto 5-cql(r7l iesr, 20-mH coil, and 1.0-mF-qisellr (75c capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at mq rhryha- ).h- ia/6a2 obxq61500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectq 6m6y2r/)o x-qaaa. -hrhibhed 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-xjvg 5/cu+a 8ymH inductor, what is the impedance ajxcg8 5+va y/ut 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-m5p d i:7ytw3bpH inductor, what is the phase angle at 1000 pbdyp w37t5 :iHz?

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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-v6f; m76*gdaiwav: h amH coil and 1.0-mF capacitor for a totaamh g:dw;i76a *vf6 val impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacita+3 zf6t0x 2b vrepflf1nces is needed in series with a 100-W resistor and 15-mH coil to get aef3b1l r2z6v+ ftxf0p 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 5000 H mxlhghedy68i29):l tz for a total i: e migd h6l8t2h)yxl9mpedance 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 resistor at 1.0-MHz for a+ qrg4apm0 m9cut*xqxu e.g 0( toeg9u00t(qcxa. pq x *m+rm4ugtal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What ixjz5jxuh w; , f-lj+u(s the impedance at 1000uj ,5lzuhxjx+-w;( j f 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 epxbh 5ca0x-2-pw*m.n yugt6 dfho+- at 1.0 kHz for a total impedance ox den tpfx* cop- 2+5 hu0gy.h-6-wambf 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.jz4,79mi(1x xjb dkfa; 8uo kh0 kHz for a phase angle of k o4j,maxu(id1f9b ;7xh kzj8 $40^{\circ}$?

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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 t8w e4-mzvnbj m m( l60dix*0eat 1.0 kHz for a total impedance of 45-xmm8tnm dzb e60i 0wl(j*4ev 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-mj4dg jrc5 rjj6/l:) y*yjpb:vF capacitor at 120 Hz. What is the phase )4lj c p v:yjjj56/:d j*gyrrbangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, jaiik1 gt 9jybk ;n z 629j3iu5s9u-tyand 1.0-mF capacitor are coyzi 2 t1 6uj9u-3yi9g;9k5n k asbtjijnnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and aj) u(w1tuykq/v(n;nr ay.h5 q -km(dm 0.350-H inductor. The dr-(n uyq(uhk a(t1.kj5mwy/n ;vm) q circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an induc:hjzxa qe:u )p hj7e o x5fym)qd*/m i,k,n(t4tor of inductive reactauhzfn,t5 xhqjp),ed:k*qym/)4 oe: i(jx m7a nce 30 W are connected in series 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 series RLC circuit containing a 50-81; yppdkoj5y W resistor, a 10-mF capacitor, and a 0.45-H inductor, d;81o5ppj y ykwhen 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 icy emnst h*1)6n series with a 500-W resistor for a phase angle of tes*) c1 6ymhn$40^{\circ}$ 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. +hsk5w kh, t+t At what frequency should the circuit be driven in order to have maximum po5ws t+ ht+,hkkwer 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 cl ym*, 9+xlbhdi hi63kz*cj+jircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactj+ z,9yibkx+h3llj*6 mc*h idance, 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 circuit i5v2aog:)hztt /u7p x ls $63^{\circ}$. 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 s4)oji- dji.o*ej3) cb;g auuresistance of 30 W. What is the powe o4*)die 3.oju-u; iag)js bjcr 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 fact2 0hy)(b,q rncazd bydij55 f1or for a series RLC circuit containing a 50-W resistor, a 10-mF cap5qj,ad5hdfiy0)2 1 (b yc nzrbacitor, 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 6-ti l/tlb:v* 3lux9 dxnth5y a 1.0-mF capacitor and a 15-mH coil in series?xul t6iy vh:tt*l3/l9 d5xnb-

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne oa. jboevglk7yn6yus (( 3g)6eded in series with a 4.7-mF capacitor for a resonant frequenc(37 keyya) v(lbg6nog 6 jous.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)v.x)eq;ejsai (hw or3)1 h8zg qhg- h a 3.7-mH inductor for a resonant frequency jqs)h1( xiregw8q. )vhgz)3e-h ;oh aof 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 sernb7s9me) xy r9ies with a 30-W resistor and a 40-mH coil if the rn xs9m9rb7 ey)esonant frequency of the circuit is to be 1000 Hz?

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