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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ex0/3 4 ;smrgec8blrn mccept

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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 state+2(ojsqmy hf35p5 ad ts 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 wicb d7y76o*vnere in a coil produces what kind of change on the induce67 bv7cdoy*en d $emf$, 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 througl5,ujf p .be yh7 so,nl,nvm(:h a loop of wire produces what ki7.h, yl ove,mpln(:f, uj5n sbnd 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 kiny3 am7v4p8l+vw nwgm7d of change on the inducedw4m 8 pm7w3 vnyvag7+l $emf$, 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 fro8uc yvr3*s u0 v og)v55q4zg :fpsdb(sm a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of l2vtp00.pefgan induced current in a conductor will be 0vp t20lpgfe. 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 horizontal table. A bar magnet is held abovusrr 2ze38a 9ecxh5 j4e its center with its north pole pointing down. The stationary magneteh 4ar 8s3xujcez925r 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 horizontn7)/ vifr s+kxal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed +/i nfr7x vks)from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fxq8 -2 q7vbpqgield vector points straight up. The magnetic field vanishes suddenly. When vqpx g78qb2 -vqiewed 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 top in a region where the /n(2y)i,k)zrp obg9ddwnjh5 mz3de8 ho (h+t magnetic field vector points straight up. e+pgzrhnj d2w(t),hi8(3 5d hkm9 /) zonboyd The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regio93 op7xgsb(y2myiy* an where the magnetic field points straimsi2xayy9 ( gpy3 *o7bght down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing u 60c jhv; (svj*wj2sccurrent northward. Two coils of wire lie flat on the table, onesv2s vjj( jcw;60 chu* 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 entering f2.dsp uuev+ luc76s(kirst. As the north pole enters the wire, the induced current will be (as viewe v.suu7cude+s klp 6(2d 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 uo ts/f uj8 *g)tpx;u8)y erk6angular speed about an axis whose direction*e g6t8stju )ypxr 8ofu)k/; u 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 rot;lhxf1d) wn s6ated at constant angular speed about an axis whose direction can be varied. In a region where1fh 6)xsdnw ;l a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.h:rg uelby, kds. :i xb7.:j qyu4)3oa
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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 thwe6+k:ew,xfcry6 s3+q( ts grat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fiebx( 2bd 8p:f c;1.eqecntsgf 6y;quh/ld. 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-wefl63uccchfn 2+(33 0hv heswy st direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential en h2 fh6c3s+c 3hluy(vf 03wcinduced 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 coxyh m/7h tc5mc 0m5v3onstant 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 transformmib x u714l-;xq2z 7 svi,fyvvs

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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. The frivd9(or ; (z1-rp,xsse :jvaicsk), t equency of the dzr ( -jsp ,osr:cvit ;)vis1,9k xae($emf$ 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 devip5/hdzk lz5(t;g2 ko rce 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 devjx y;.(fuu dm,ice 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 loops than the primary 8gn:*px4i0p fbi: hx :kb*o ee:mqc 6pcoil then itb*0b x: k8fog6pq:4cx hpip*: ne:mei 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 moei c4l )(xotbf8 qf8;are loops than the secondary coil then iqxibo8t (cf 4; )8afelt 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 po(juvtml )of :32kfa: iwer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cir /bvel- j b(4ph8jrd-l8k+dj4qe)awn cuit,

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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 inqj 2 se)f9xpg/-aea5fuy5.ubductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battx5)jybp9 -g q.52sfae fu/aeuery, 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 ( krq.-x wp+ishiyq7u.. / nmebattery of constant terminal voltage. At the moment contact is made with the battery, the voltage uqhqin .k/7s+r. x(mi-ey.w p across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to a3wny 5 -5tmnscn $emf$. 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 resistanqvlh(dy 9. 1rxce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The4 o0l5k vxmdp0 time constant for the circuit represents the tim4kopd0xv m50 le 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 batt09kh yba:g . 8ibjw5jwery. The battery is suddenly removed from the circuit. 5jkw9b h0:g8b.wijya 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 same pdpqweo 8/mo 139nz- h:./ pjgzuu9glb(xl4munits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuitm;hr efr3z. 0xd0dz 0g, 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 anwr87, qod fh9d9jb ngdi 4 2j/3mjbg(l AC power supply. In this circuit, the currenqflr ,d9i(jm/24dhwn8 j bbg9 d7ogj3t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancenx 6zm)okm-y g b87h4sv: f0j-2hotsq in an ac circuit changes by what factor when the frequency k j :b-8 o) snmqtghy7vfx6z4oh- 2sm0is 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 jn/ 9;2etnyx macross an inductor is doubled, the inductive reactancet n9 m;2x/jnye 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 zero, the inlg6ls /:d+el zductive reactd6/zlsg+l: leance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the chokp/s cz.:p0 urrehpo c:s0kp/.znt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance ieg7x5jrwoaz(qq88i r sps6tef g5m0 j-:q4:un an ac circuit changes by what factor when the frequenpx5sqetr(5: rq4 0-fijwzqem gg6 :sa7j 88u ocy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the :w tyff5+gxsyl5d jlgu;- .xlhm0:+nAC voltage across a capacitor approaches zero, the capacitive reactance of that5+nxu. :fl dyx+ygm0f- hljl5 s:g;wt 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 inducto ojtlb:bpk27+m8o +njq z91orr:p. j tr and capacitor in a Rbopr8j 1+ obz:lt.+ktq omp jn792j :rLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defi (v*nlxv f;1 km,4ra ajo-55 5tvmqrnxned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasey6gchi g7 f5/bs if R increases. When is this statemgc75f 6iy /ghbent 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 impedanic)ue2go/cr+a,ie7ho c3 *o l ce 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 circuitk/q-p +pxe6 ua 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 i6 /k :v:ijjyn7l9q nhzn an LRC series circuit, the resonant frequency of that circuit wil :9 il7z6v:jnnj khq/yl

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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 dz*c/jcm 57746sszh t2 hhp yamriven 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 ciry+vfgx-:4 4uv8nrn iw m40v ltcuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unv1y ik3n 4/ht5.dxch)ytc 1sziform magnetic field of 0.20 T. Find the magnetic flux through the .hk54tv)hz3ycc/nd xy1 t 1is 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 rot f qs+fy27 b6o -ri1rv13hsf)ctdiften17o9 z ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the rz)do+ f9 n h1e1roff 26y1i-ivtc3stfs b77qloop 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 ap/6 jxn tx4fa3 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 ar3xa/ 4fnxj 6tpe 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 single loop i8 f 6fxv-lmch6o i00rrfv+l.bs 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 7f, 9fcdd)knf$4.0 \times 10^{-5} \; Wb$ 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 witct1cw k9/ n;d /nf zx1/mte.ybh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fr./fbzmd/tte 119xwnk /c ;nyc om 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 +cubp *xk7h7 yfg- f37u)tnq8m s8lx f15 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 and areydp6 wx.5z7;oykzbu + 2m-d.h*y gloia $0.20 \; m^{2}$ 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 spa.6phg u+gus(ty gcy5 ;n of 60 m flies horizontally at a location where the downward cc+p 6;g(yggtu uhs.5yomponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at hf7ay(sx (,lla constant angular velocity of 2.0 rad/s about a vertical axis through o7a,l( hlxyf (sne 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-section dqyd,.mihb0 b(+1bhytmv0 x2al area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arei9k9 4w-z t2eu e*fzeca $0.090 \; m^{2}$ 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. xgc1 e)/gz idts, 5.qq)qb 8ry Each loop is 12 cm long and 8 cm wide. The armature rot sz5x/qeg)tdqr1bc. ,g 8iq)y ates 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 100z ;wd/6f 1scc4i leoe- turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wi)g6yjnn ,y* -dn34 lb:yohkvqth an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0*g , :ky-jn qlhyb4d6v) noy3n50 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 geneio9 bo7wy:w;5h.2c lc*jl 3 mlxsw)fo rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC moc u75sf 1svcdmlxb:cs t:a:+g sjgp/3bf,:w /tor have 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 fg4:vzfkw.bw1 s7/5h vw n/ sxkwj-e)motor operates on 120 V AC, and when running at full speed it generates)f vkvg: j -sw1fwz/ w5/exn 4w.h7bks 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 supply.; prikv b6hpqo92 *f5a The operating current is 1.0 A. What is thao fq*hv96p;2 p5rikbe 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 c;33.;t oxbsyp ohpcbj 6grv* 3onnected to a 24-V power supply. The operating current is p*v3 3bpjg yct 6so.3o; bh;xr1.0 A 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 W96 vc0ct9 pxkh-0 zbbi0aow4 s is connected to a 24-V power supply. The operating current is 1.0hbzaxt609 0cc bo pv i9sk-04w 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 prim yfb1em;xq sqp:jpw*4*bp.h mvw cdn+ 8k-s+,ary 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 8 )txa m:jfqae12m.u ce:3suw8olkp(A to flow in the secondary. How mac8o()e s mu auq21xm8k fpte.::jw 3lany 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 turnssqew:9+a v19jrp y g.x are necessary in a 110-V primary if the 24-V secondary has 100g+.yx vjar wesq1p99: 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-uh,9h w cm5sz2turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in t,u2c9 hws hzm5he 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 primahf* f s)sanaf*lvau-(f20s -s su5ib d7 j;;svry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in ths*ls af ;7sah db vu)*a;f s(nvu-jss -0f25ife 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 providzrwxb8xh4 s06es 7500 V at 10.0 mA. The primary 0x 46s xbzrhw8coil 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 has 60 turns on its primary coil nu-g8k*j ukp8and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondauj-gkup88 *knry?

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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 it a;l/tq zz3/izalg2 q3s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prim2g3l3 ; zqi//t zazalqary, 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* u, zavodlg;:. omye6 ei4gm, 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary o g;4u.6ygemoe:,zam *id,lvto be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 :iw- p8 htodvo;0z4az0 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of thv0 zoa8:;tiowh- 4 zdpe 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 transformerw* od8.kyp+ hy has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional los+wy 8pkdyo .*hses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppel o:ncs68bs9c d up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numslcon 68b:sc 9ber 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 12 b :)8:7j;hcdr rl(awlb z77i2hitagz 0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power l:igdzr7lab)h( 87 zwcalb72r:j ih;t ine 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 producesrb v xgqkwq0e2o-qz2s*;)o :r 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powe0wzxb o;2vqr k: erq2*g)-qso r 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+f*kubrgr :b72k i9s x line 50 km long has a total resistance of 0.60 W. A generator brxk27: *9 f+ rksguibproduces 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 km long has a total resis1,6 buavjzr r:u5nxo501 y hnjlfhi55tance 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 ratio of 100:1. What percentage of the original energy is lost when the tran: nuj6,5 xbu55y hr 11v0hrofj5ni azlsformer 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 vvzn4lalzy 1 2e *5 7q4eakm1c1000 V. How much less power would be lost *c4 l yz zvn725laae1k1ev4mq if the power 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 20 A. I.33jz,xd(lp ira v th3t 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 is not to exceed 0.010% of thh x3ar lt3 pdi3z.v(j,e 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. Ho(8fylx,vf*;m/i.pj o9ap -h6 dr wdt yw much energy is stored in the coil's magneti.hl 9td xajf* p,8r/(vf-wd;p moiy6yc field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W t;ltho 91m8khresistor and an 18-H inductor. What is this circuhtl18tohm 9 ;kit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is n i:jbn-opar.a1v;9w120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the n q*u( 44ffjtkpeak 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 1hx0/8f 8jjo) xsu u6ub20-V AC outlet. What is the resistance of the lamp8)jsu x /bhuux8jf6o 0?

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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 (5rhv(rg 7b ffh/kl)k0yx, x ipeak current thh ,i (0yvxkhgk)f 7rf/lb 5rx(rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac 4ut : h74jsfhrpower supply. What is the power dissipau4 hthjrs f7:4ted 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 ,ekt*kxw64ik )9u1h vcm1qay a 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resxqt6pp f:w- l5istor 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 resistor il,z22w feyr: rs $I = 0.80 \sin (240 t)$. 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(ti,wujmct5-)y ojh krf1-o1 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 2.5rtax n06;s4o sp7qty)0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reaupgv mz g foa:8-n1 1-/+xxj2cv.g vfzctance?

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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 reactancpb72bo i6prnu o 5v5x*e at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of-gk6p /ec9uov i5bs z0 20 kHz is uobcsek0/5 gzv 9p6 -iapplied 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 2.500c 1 ( gfqrvf:fz.t:eh-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 x p77.bzj 1mqusp q:z4reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to h)5nv0h rz 8)dbl:ps zuave 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 doe/ cs zrrmr 9jro+ -x*jy)zp/+f.of lh1s a 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 reactang db jp+y2l+v+y k :3glyz;;ph f2i4fiz ,xer/ce of a 0.010-mF capacitor be 100 W?b+g:p 4 l,2yvj2d;e3 rpig +yh;izykzl+/f fx

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 88 bgonosn.xpyf: x ,sdjz;s+k:z-:p1000 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,ob1wg 47 h/ov ,.jdsbj 15.0 W inductive reactance, and 10.7 /h g14o,s jjd.vobbw0 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 impedacwjrd76 1 mim5nce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mw c7d5ri m1m6jF 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 1500 Hz if a 100-Wucd) bw.rm, gq ug/12o resistor, 20-mH coil, and 1.0-mF capacitor aqo1,) mu ggrc wd.b/u2re connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH tq . ixr0,u;fjm(c,cbinductor, what is the impedance .,ibj t;xcqr (0 uf,mcat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whs r3l7 chxpha05mlg4 /at is the phase angle at 1000 Hzlx7s gcahh /43mlp5r0?

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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 1.0- n;7sdl f8ys;umF capacitor 8f7suds;nyl; 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 in series with a 100-W resistu z6/7d(yi amqor and 15-m iuz(ay d6/7mqH 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 inzlf3m1*t. rzu series with a 450-mH inductor at 5000 Hz for a total impedance of 40.ur t*1 z3mlzf000 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 sna/ hm7d-6* uvvzg)qo eries with a 100-kW resistor at 1.0-MHz for a total i dv6a7*-)hgno /qumzv 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. Whaa/ es g31x.dykt is the impedance at a13/x s.kydeg 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 series with a 10-mF capzqxd-.iz-irnz r )i*;i+ i(a cacitor at 1.0 kHz for a total impenxi. rzr+i-*- )di(z;aciiz qdance 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 l g,niyz.wus;y+ta911.0 kHz for a phaseizn .w,say1t+9g ;l yu 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 30czek//*( ytn ckb; x+ukb p94d-W resistor at 1.0 kHz for a total ibxdykk(cp ek/u ;*c94tb/+z nmpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the m;)gdn ydmf29a(.pz hgb k-+cphase az92;kmchb +p -gf()md dnyg .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 if a 100-W resistor, 20-mH conxub b:71r9 ajil, and 1.0-mF capacitor are connected innbxu1j97b ar: 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 resisyv mt* v;vre w g(6-qsh9qw+*4gutc,htor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 12;v+ 9q w-htvw qrs*h6umg(cy,getv*4 0-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 indi zbjg+ -5wx.br1lwe9uctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this +xewb51i bw.l9z-jrg 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 8kip5hxwy)mhoqtqd2 h 480-s7 j w1 uyseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected t5yhwxytu 2 hqs)h4dq-mw 7oj808ik1po 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 i;vjp 6 sf,kicu9 aqe a0zzbuwd97d89;-i-w z zn series with a 500-W resistor for a phase angle offp9wsb7-k9,ie; uz- z9a8d;06jzvazwi q cd u $40^{\circ}$ 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 Rby4* (;z yra 2b7oatgc = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivbtro z74byg;c*a2y a( ing 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 j:ggyq6 w yx a lr):+-;odz7jy12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected toyax6 q)wd rgj+o:yj z:-7gl y; 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 :5rlry f) *b6cducdb 7AC 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. Whathwn.efg)r6 g 6 is the peg 6) fnwh.g6rower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor 8bcd cwsu3o)x6db: 6 6mb gkn8for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and: 68cmb)s dnxbkgu86dwb6c 3o 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 coil in serht5ut)gr-f2;gg5o u/7y zx hwies? 57z; w)f5-yrtghugg /ohxut2

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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 rewr53z pi qp;1q*wgl5n5 l9nvesonant frequen q 5qwni;lgpz59*5lrv p1en w3cy 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 forssi54 r 7ak/jwnva(6 c a resonant frequen4akrw/(jcan7 6isv s 5cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor a*pt joln :y6rzs56i 6nnd a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hzs 5t6oz 6n*lnrpyij6:?

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