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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 6 9ee3z,p g/5wrl nhqzare 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 thm +s- iv f7se11pdt-vuat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change oi0rl2s ctk-0bl(v d 70(nfqff zu tc4bj4)zd+n thet00nd)(dc 7rcj b4lz4flqffbui -ts(z0v+k 2 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 ma + 1y(ebjbil+.c 96l+kz ohgfngnetic field through a loop of wire produces what kind of chan6e++ocg 1byk ln.fl i(+hjb9z ge 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 change on the indf 015wc2aafuw+ms n;q uced s5cfw q+1 amn 20;awuf$emf$, 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 maq2wo: *v-g3 pknzjjyo 4. s1fvgnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a 5 urry yh)x-6nconductor will be that which tends to produ6- n5xru) ryyhce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. erd, 6v /y*0d,jvvi-1ym fn+q.c fm ry A bar magnet is held above its center with its north pole pointing down. The stationary magnet inf.e6,v01, v/ q+icdd rrmnf*y myvy-jduces (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 abo(t 4b.l 1 o8b jqikm*fuza:g dq+)tn4mve its center with its north pole pointing down, and released. As it approaches th(:8 b)qboujgm.n ltf m+ 4di1*tqk a4ze 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 1 yt*4sb afyvca323p-zmms2cyey*w3x ( ak-za region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,3(tz2xyf a3-yy *c av4sesy1m3pwz-2kcb * ma 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 top in a rehumw s5hx6 3-tgion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. h5-3w6stxhum 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 magt6bm( sy 0m vd3g-vwx,inx7 z.netic field points straight down. The magnetic field disappears suddenly. When viewed from above,z,0 m xgxv m(bsdt-ivy 6n.37w 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 carries an ever-increasinqw1;;ir,qn wbg current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fw1;n qr;bq,wirom above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering f yve0;ed19j dkirst. As the north pole enters the wire, the induced current will vdde1 ejy0 k9;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 whjs:di9dfc 1afae 44i(ose direction can be varied4jaiff: a1 4ds(c9ied. 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 angular speed about an axhdc8 r+r* x-2 w g(.(yk4ed2m nxelndzis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the lo rh g8xezk( - w2dycd4le*. xmn2r(dn+op'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.d6plvbsjk k/2 .wq4e8
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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 vkk3 e+z;r dzir i;3euh-9wk.that 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 m,yhyj /k u2dshmp. :fx8j db,:agnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwapr w.9 t9)ufa :ugnm1sh +ox4lrd at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential mh 9 ogw+u1)t 9:xpl4au.fsnr 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 veloci4r lbm/we+yo 9ty $\omega$ 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 tra or w13mxx7q+dqwhsc,u.8 )yx nsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The4v;3cr9 *xy ivfvvp2j frequency of the rp423 vxvc ; y*vjfv9i$emf$ 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 devicesi;i()0z 1nfb bj-,b qwpk,io used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tu hr:yy r4z-qre-c2 i5kmp4t( hat

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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 seco7 9g6 g6xxivs dxrif4am perehm(r-, 08cx6e 7ndary coil contains more loops than the primary coil then it issvr dx 8fhe6 ( 6-x9g6, xicx7mpmi0ra egr4e7 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 s9pv;wedn3 s0than the secondary coil then it 9w p;dvs 3sne0is 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 inputfot2u)4,c9p7y cx rvbe h02.bff m2fe

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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 circuicac;:vmhc ng35 hl idh6p, )y:t,

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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 ido/rm 04hb ,ofyeal battery of constant terminal voltage. At the moment contact is made with tfhr,o 4yo/m0bhe 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 sld92 hx /l92pdlgx2 sbattery of constant terminal voltage. At the moment contact is map2l/lsxs 2xl9 d9 d2ghde 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, gy*nc696-gdo j vnby 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 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 connex9;sceq gpm54 0e*ebhcted 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 induslt0o/(23k qjn*sjf8nrl s v1ctor are connected in series to a battery. The time constant for the circuit represents the timevlojqf*ntjns r3 12/8lsk (0s required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bare 0 1upz f9nl a58mj*kt+s/vhszt-(o ttery is suddenly removed from the circuit. The time constant for of the circuit represents the time e 85atlz+tmsn*1 v0 ku hoszpj r9(/-frequired 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 un7v8,x .s57q eelloh8u 8r) v0bkimcuyits 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 bn6oiv,s iwa,(+1),nl wlt uj 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 th72lavxxx9 n7 q7ou9nsis circuit, the curren9 l7as7nx2vxnxqo97 ut

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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 circuith 3w;pzc5 9/ uc*jbk:l0pbupwne( 9rf changes by what factor when the frequencywf0b; 95pnl*k( w9jc 3:ucurp/ bpzhe 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 acros778zyan m m4pes an inductor is doubled, the inductive reactance of that an p84mm77e yzinductor

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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 zero, the jrnvd yim58x(gi4 /eh 9)x2qq inductive reactance of that x/qqigr i4 ) yvjx5nmd98h(e2coil

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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 circuit1ca/ rq c2:n/f.xnjpv, the current vcq nx/2.rca:1p /jnf

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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,eufvr4t+ve(8 vj vac)z9 d/l ac circuit changes by what factor when the frequency is triple(8vtu/jvv +e 9vdl4,c r ef)azd?

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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 zerosmd 7 q;mifsf29o )z./n lfd.t, the capacitive reactal.9 m/i fz ) qsdd;nto7fm2sf.nce of 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 1(a j-hj i 4dwm.l6kq+,aofa ethe inductor and capacitor in a RLae qj-(l1j fa.ah m4w+ i6d,koC 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 i ,x m /z(:b8d5 xiuhabf)gl.cRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ofbhyy4t i ls f(wc2w86( the circuit increases if R increases. f64w(s yl2bithw8y c( When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance 4r2 a+qt6efsb 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 impedance of the circuit increases ifsxr tk7p6yz j1*l bwp+6ec+a3 $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit /c-6dw-4t8 ziln a,n :6ojedkxe* alm, the resonant frequency of that circuit wiltdel:*jw6a xmn8a/ez, l 4 k6-ic-ond l

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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 vol7 f)vgct ;chb:tage. 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 circuf qyo7egg,) za k+t( bn,+z7bcit 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 rw+l* k 3.51ct 7xtmyj kxyg-ecadius 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 the magnetic field vwx 1yk*y+ ck-tc5tj .xlg3 7emector 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 y9z.ax),sf/a o tw9gk uniform magnetic field of 0.20 T. Find the magnetic flux through the lo)xzgoyfk 9a.a9,/w stop 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 vyd ;6byne7+i of 0.20 T. Find the magnetdy6y ;7b+vn eiic 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 singlu)3oo dnl n86r9 qqfp3zv y*,le 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 cp 5+prpm5 mdj+oil changes 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 wy wmo)/8n+qu a-2fhgoire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coim w2u ya8+)oo- qhn/fgl. 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 turkb:l;k ay l76fns 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 and ap +) os0bj5cuxd7aub9xt :5gpvcn-w3 rea $0.20 \; m^{2}$ 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 locat (mr*r-e tzx8dion where the do (dm xte8-zr*rwnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that 7lg .i;y msqxrsrwy+)*;u4 in is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiel4yymrqi *g7 ;u.s)nx sril+w;d 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 j3 9g (h,nsulr5,qjvdand 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 turnsyxwr n:b bsv)/ l(wn. n(z :)e7sbgyq/ 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 loop;p2gtl q -dyc/aan8ajxdl*)3 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 rognp -l) t;*d8ajc xa23ldaqy /tation, 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 turns o wmqjpoy ;t693fim8 (uf 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 sim7 y/beikvy.j/o+f8h/u9b/qzni qr r:t 2m o*nple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating co8*m2zi enby y.r/ob9o :+/kuj7/ qh nv/ frqitil 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 withq3ygf+ ijo .igc;9 q,u a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor os bgp51:whs.n perates 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 mo);dq 0d kylqw r kf(*fg*lv85gtor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it ge*dk0rd8l gv(kwly g;qq 5*f)f nerates 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 to a 24-V power suppl7ht zo1gip 453mq tqx:y. The operating current is 1.0 A. What is the start-ut7o:mzhqp3 x 1 q5itg4p 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 powecjma9)0bb,fep3tc 1 vr supply. The operating current is 1.0 A 9jt3a1,f cpe)bvm0bc at full 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 resistance 6.0 W is cont5 iir je*n6(e9yq zyq(:,ciynected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back iy (y ,(*qtrce6z95 e:njiyiq$emf$ 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 p lsjcw.749s zeo-2 w2iq 3qpgnu (p*rhrimary 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 causes 14 A t w5u/9uiq8te5+tsf 5v (3q9a o9etn.zf evp ojo flow in the secondary.te5+p8uv95fi5n/zav9 o wtqe s 9ju3fo(.eqt How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many ttyr7sh(xh n.x9du(+1c xe+p05smn h uurns are necessary in a 110-V primary if the 24-V secondary has 100 tdre (0x9hux cu7pn+mshnh1s5y+ t.(xurns?

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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 b8f..:l+r a s2e xlnbj/g9 usasecondary coil. If the current in the secondary is 3.0 A, what is the cur.r: 8e. a/xb2 ulnsgljfa +9bsrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary ofufg*jpdst,c7a, 7 :llg3o g ad2, -equ a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco,7 7u3g,*2-d:oaalfuje, p dglq ct gsndary?

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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 trcj/ /0be*e) nuor mn)ransformer provides 7500 V at 10.0 mA. The primary coil operates on 10e) jo*r/c)mrnneb /u20 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has k fx/p7wbr4 -o60 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 voltage is present in the se pkor-x7/bwf4condary?

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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 30bsamzm 7;qkkn,4 ;o;h knz8 -s2 nm+qy0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wha;s qok+2mbq,4hkyn 87k mnzz;sa m-; nt 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 second1s8iqw g9l;zil; u) hrary has 200 turns. If the input current at the primauz1i;qr9lgl8 swh;)i ry is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secon7y) /btriv; suifz88r ec)y3 hdary has 200 turns. If the input voltage t e ifzb i/vyc7t8sh)uy;)3rr8o the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns7g;:g)e ta-iqshjy d- and its secondary has 200 turns. If the tg)ia--s d :jhg;eq7ypower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage islqsxd.vser *x (3(/bw usually stepped up to 4500 V by a transformer and transmitted through a power line of total r.x(q3b/le * dvx s(srwesistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually gb, jzy5uzy7/ 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 transmission5gb yzuz j7y,/ 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 usually stepped cjzp3e5-cfq90 f-phl up to 4500 V by a transformer and transmitted through a power line olc-3jqpp09c5- f fhezf 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 q:zh//tjb/l j generator produces 100 V at 70 A. In order to red q//hj blz:/tjuce 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 km long has a total resistance of.-ah i2q ut+ohvjzxrpfnr+xi 81.i67 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 ratio of 100:1. What pehj .u-1r7ipio v8fhi n+. x6xz 2aqrt+rcentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wov1/gby(5c . d0erzkjruld be lost if the power were transmitted at 3000 V in0rkv/.rb (e5czjd yg1 stead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a (bwh7(n fhumrk(5p*lqa 7xj0 line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tran5 arnb7 pwu7lm0f( xkh(jq(*hsformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.7tol. t+mu k5,a;dow0uf o4yo0 A. How much energy is stored in the coil's magnetic fie0 ou+lyo7d mftk;ota. 5 ,4would?

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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 contain-t g5em5b4c4pl uvjv d-1z 2zks a 6.0-W resistor and an 18-H inductor. What is this circuit's time constave2 5 g-tkz4mdl5zp14c bj v-unt?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage+-:7 dydkzc zj 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. Whbf1.u+, ptbdrat 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.6keb ka+ 13cgx What is the resistance of the lam kegx6 +cba1k3p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the.atu) zvwopl(:jfj*0/kyf y( peak current through the resistoykaz.((fjj* )y0f / vop:ultwr?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power q n0znrv2h kffh; gq2 2;0nwf-dissipated in;2vqzf2nn;hfrnq 0kg- h f02w 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 resi q+vdwi:m4gix :22zj astor 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,gw p5 ,p ldciua/gd /0)lhl uv3sf+zyzc 8;c7 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 renw aalm6k37.a i;7lotsistor 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 ofxv/ :mmq/o a3x 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 ewvs3s7 k :4fwcoil 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.vix03z y/n 8im;mbd/s0 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 reactance at h cm)vy/bcj*4 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 6oq5x* 5vd15-ipmgcxq0-mH inductor when 120 V AC at a frequency of 20 kHz is adqp51 c gv- 5xmo*x5iqpplied 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 due to a 110-V, 60.0 Hz soflg :o *9q,od1q dgs+iurce?

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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 kHzrrd nn8ka22 a4?

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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 tx 2 o+c8fwk,zsd9 mmh3o have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120a)axlv/pvcyq rei/6, c5 l*a) 0 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 100 .- p 4-c4wo56vvs cgy-yepmzwWvme p-45y-.s6pvwcgoz ycw -4?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capaci t6lm 07ugfob+tor 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 resistanc bz(t9v:k.38tr7 qm (caqued je, 15.0 W inductive reactance, and 10.0 W. 3edtajz79v( :trucbkq(m 8 q 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 1i.q.ne+ r w y(wr4gb7c500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec47en.ri qc.+rbw( wgy ted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-/walh2g nk; *ydl; s8pipf+ -smF capacitor are connected inss8;2 /awpgk-if l+yl *d;phn 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 a6 e dg:l4 u0aa8slcm.in series with a 20-mH inductor, what is the impedancsa l4 uc:m8d0ga.6aele 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 dd5czw4cbm1 4q.y3s ain series with a 20-mH inductor, what is the pha4y5 bczc3sq4.adwdm 1 se angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20u7 k wo6xzu)p,r *)mso-mH coil and 1.0-mF capacito 67*,)uo) so kmuxrpzwr for a total 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 capacitances is needed ib d+o;h qy7n4dh/jc0 mn series with a 100-W resistor and 15-mHc+n07ho d4qm;jdb yh/ coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductorsm(6zt e;3nrj at 5000 Hz for a tot6n;s ez3t m(rjal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wmadyi 5; :9.ewokfh2jith a 100-kW resistor at 1.0-MHz for a total impedance k5.2 y: h9df;ajm oewiof 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 sej-2 jt+hfr wp.ries with a 20-mF capacitor. What is the impedance at 100 2wj-jp tr+f.h0 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 withc0. emrcr 8 qbu6u9fg2z h87id a 10-mF capacitor at 1.0 kHz for a total imp 8u07. fz96eiqdb r2 cgm8ucrhedance 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 with6 vc t(wpf+*dpibmx9 9 a 10-mF capacitor at 1.0 kHz for a phasd 6mp fiw9xc9+bpv *t(e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tor uzygh .d8ongtm :w hd7dua2 7yh95l/ l0pf96tal i wuaohgp/l f0tdz6r 9hn77d h2y :dg.58ymu 9lmpedance 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 seri6 wqfebxaw7+ c5+npu q7b/r o-es with a 100-mF capacitor at 120 Hz. What is the phase anf+ 76w aoe -rn/7qubqp+xcw5bgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows agn:hde a (qqg; +*n.dzt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF zad * h(:e.ndgnq+ q;gcapacitor 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 resistorj8a:n kaq5 ivs;d-i*j, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suinvd-*a 8kiqj5: j;as pply. 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 *y9n5vulv jrhq ) s;or8mg*iz0mj 31rcapacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected ini jn hl8m)sj91rr 0uz* g5m*qor;vvy3 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 containc,1 bp8a (uyl g3f1z/ms-kixsing a 50-W resistor, a 10-mF capacitor, and a 0.45y/pk,s mxi1 s b (8ul1ac-3gfz-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 ws:0mtv0ld3j7z 4ml g-W resistor for a phase angle of :v4w0tmldz 0 lm3js g7$40^{\circ}$ 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 mdz7u v3s-d;lm F. At what frequency should the circuit be driven in order to have maximum power transferred from the drivinu-sl; 3ddm zv7g 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 resistance, 15.0 u*p jpbp3h,(qhvg , :czktvh* 8xo.9aW inductive reactance, a:*kxt z(o*8c9qv b,v pa.jpgh ,hu3 hpnd 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an (e r9 t:s8)xokmgm n4oAC 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 has an impedance of 60 W and a resistance of 30 W. What nhvo 8 p *sqt(ehs1x+5(jtn0y9xf8h his the power factor?etxs0st8 (o( 1 8h x+qvhn59*ypjfhnh

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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 l56eg dqe5r :dseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne :e55gr eqdl6dcted 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 coil in series?3(xueyb a1vb -buye b3vax-( 1

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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 widcjjjf); e //h o5ve1br(jzr1th a 4.7-mF capacitor for a resonant frequhvb fr/1/ j cej)z;d1 j(jeo5rency 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 res0+5brme elec3onant frequencem+l3c er5b e0y 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 placeds5(5) bgt hv x83mvcjx in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 ) 58v vjmxg(bxt53hcsHz?

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