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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;te t0jf: zyf6 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 t-u+hp wn) ock89w r:xyhat 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 *jmo),wz6-xuf nw ha)a coil produces what kind of change on the iwazf u6) m* n,j-)xohwnduced $emf$, 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 wired w4f8 ye6o.x d6;u.bn y)fhiejgq.q2 produces what kinybe 6g.dw.f;q2xnh8dy iqo. )je6u4fd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chang gg+es dz.b-x+e on the inducd.eb+gz+s x -ged $emf$, 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 acfju ( mnq(;0acx-f3 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 an induced curre0 nmf )7v(j fvi;/rgcxnt in a conductor will be that which tends to produce which of the following ef7vf;r n)ij f/xv(cm0gfects?

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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 wbc j)(t -ne,dxjq50z6 roda98 ;n izta horizontal table. A bar magnet is held above its center with its north pole pojot j5-;dztni0 , 6(za wer) xcdbn9q8inting 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 table. A bar magnet is held above ibw9)un z m1t8d7lei,uts center w)bwei8du 9u,7nmlz t1 ith its north pole pointing down, and 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 where the magneti:l 1xqho gdi(.h.p8yqum ) 5cahk. vx/c field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil asxxhokqv).uc dq mapiyl./8 (:. hg1 5h 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 l4zpcnu 7c6l6 zc67 rothe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction7ollc47czr6z cu66 p n 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 y8ro- lb uye dll;u6 *x--y*vntop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induc*6rxyl;yl- u-eu bn ovy*d-8l ed 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 r+f*kgfpg21r6bg ym (-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, th2 gpgrm1+rf (6fy gb*ke 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 sodwb,sf+ *va r8m+k)y)znsl; pw0 -dwire with the north pole entering first. As the north pole enters the wire, the induced current will p)dz*y vsolmdfa sn)w , ;s0++-rbwk8 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 cojq o: h v;p6-c*tpefx+nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rot eqc;:vtfxhp*p+-6o j ation 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 o 2z (y1yknhl s7n,6goangular speed about an axis whose dirkn,o7ylh6(goy z n2s1 ection 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 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.y-la31:gj khgl))5u8 ,2 pzf jh iwhex
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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 cn.ghqsr) :l6t obp50an $emf$ 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 ,at77r3n+qyl)so-wx 4udg gsvo +q*bmagnetic 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 mopfu(nm )aacw ,k0ev 30ved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indpnce)uv0 mfa0 a3 ,w(kuced 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 r*2adk or: j-umotates 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 trans+yhg(e xw7 c3k hfo3btn5s-r9forms

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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 fri3si, )m/yob3 tt- owwequency of the ys,tio w oi)t 3-3/wbm$emf$ 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 deviu 18tml( e)4ldw8behc ce 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 that2d9n, gafkp96yuuj +h

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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 tp.n49k o7s vwpz ah(gn2.6y wihe secondary coil contains more loops than the primary coil then it iapvys7iw4n(9kw. 26 po zgn h.s a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary 9./mdj w,mg my ukf5f1;t6ou rcoil then ukr5 o m6;w9fm/y. mg1t ,judfit 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 (d bfr5(, quu2gvq,k kpower 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 circuq,a+87 g:3mg -w-9lhrwwz) meb9tmq7ruvx pa it,

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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 ideal battery of cdi gi) qxb m/pj)e6wey7/g51aonstant terminal voltage. At the moment contact is made with the battery, the voltage across thepe wj6dxb7y)i/i)a1 qgme/ 5g resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consts)jwy prr:,/bl7i xnne* o4j-ant terminal vo*yen) b4r l-o sjjwr/ p7,ni:xltage. At the moment 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 wo5rvr ncqb*2 -ith 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 connected tjwv34u ycdsya6 2cl 6k0ku0e2o 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 battq/tm :w p3b4nuery. The time constant for 4tqpbmn/ 3wu:the circuit represents the time 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 b8(atyz5e+mb e z9 ,: 34ee9zdgmzkono attery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fo9 t4 zzy:ze8o5k+( 3zme ,mbeead9gn or 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 haqnlr ) jmt)t07ve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC pd fft7rwv 1bfw */b8.sower 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 cir (qfqm1sbvk1cg.)6+q ko u 1xacuit, the current( cqx1mq1. sqvk)+1b6fo akgu

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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 f ri.r.;zscnxw42cf i.)2jp/+w k gfzgactor when the frequency is fxc /2 ..gr.)gp;wz r4z+iw2kcfinj stripled?

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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 n62soq (keo:i /co(vnacross an inductor is doubled, the inductive reactan o2v:en6 o/n( kcqsio(ce 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 Ak(*/in qooca( C voltage across an inductor approaches zero, the inductive reactance of that c( no oiq(/ack*oil

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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 thi2 vlc4mlu.ry:ls-jb4o d),y ys circuit, the current.sl :4olyuycjvbr-m) d, 4l2y

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what fczj3qkl47xk c+y twv *,koour(*w as(;),a teactor when the frequency is t(vk;*yr34wk tla ,co),owcj+a e uxs7zqt k*(ripled?

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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 approab sv9:436amroh ub9 roches zero, the capaciti3b :rusboorvm4 a 99h6ve reactance 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 betwee5 x )dr/lw) b 9tov38zuqiqan5n the voltages of the inductor and capacitor in a RLC seqbdo)3v5a)l/ q xuinz8 t9wr5ries 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 RLCbkwn3g p 2svkelr) 0ec*r;..p 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 impqr5; x at0uy)gyk;o3dedance of the circuit increases if R increases. When is this ox3yr;dqgu k5;) at0y 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 circuit increas l 1pv yqb5l3fy3plh4)es 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 ofpr2fc(tp ps1 (ri7rat :(xoh 8 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 thac3*hwa qm; z*e capacitance both double in an LRC series circuit, the resonant frequency of thh m qz*wc3a*;aat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonad*4tek pn y1-wnce,

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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 RLCrymbos + ,/ j(t7v;wwa circuit 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 ramfsmuiv 04n84 hgmal9nq1:e i,j3m 8wdius 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 vector are paralgv9j:,n30i8eq 14asu8wmh im ml4mfnlel.

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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 unif/ *b6n7eve 9wgx c rdc3t0a/qoorm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetioa g/d0nw ce*63xbv9q ecrt/7c 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 ravx3( z+2 bcmjrjrbx/e5 x;:hv dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the xj3v:e +r xjx2z(/ b; 5crbhvmloop 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.1vi ewss3n 0r,mqx1m 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 fro* l:v:.qd:eytrc orrh+ u7 b3nsc,5kwm $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squbi; .m *8ercy:0t fc3tsed*v rare frame with sides 18 cm. A uf ydvrs c 8i0t*ct*mee ;:3rb.niform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1hn:w 7v.pw5zv7reh zw 8v 3o5g5 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 and9ddf1+cafnn8 a1u/ ldxh ,*rz area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wh)lh:7nmilpxfg* 49 o +)yrlpjere the downward component of the Eartyxl7p+)o4n r)pm 9g lil *f:hjh's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a cobc m;75kyke.qnstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in 5q.m; ekc7kyb 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 generaz9q m7 jlx,wv5tor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1d /+/,+zn e;gowbzwdz a qi/e:00 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 rectangular8 2zz7w1ocbp2 euh3*lig-le ( ox2f yf loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rolle 22oo3fb2- i fpz1y hucz(8*gewx 7tates 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 8sk e tcr*;hmsb0;5ye100 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 co9su9ggq./t 5ujgs;v knstruct a simple AC generator with an output of 12 V maxiu/ s9vkt;9. usjgqg g5mum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gene7bda7c )je5,re+ +chjyz1yrrrator 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 motor have a resistance of 6.00 W. The motor operates b8+3nxqja4g9(*vft eaz mcj6on $120 \; V$ 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 DCso kmd8dj2p6b/5yq2p motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when rundsypjb6/kqdm 82o2 p5 ning 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 i0.e-cimx a 0) t*53f:y uc3rofqdaq hks connected to a 24-V power supply. The 3c0q uyki): h3xfatomfd a5cr *-.qe0operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistancyx 8rcx(npb8c9b7zjzy,/ ji(e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whz9xp8 jcn i y(/bjzcr 87ybx(,at 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 connected to a 24-V power )lex7 nr4 y ah)pg91bvs.6wwpx3 6ska supply. The operating cus7h6yg. 3bvpa1eakx9)6pr wn) s4 w xlrrent 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 voltage of2he ::gb3dx lo $120 \; V$ 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 prszjb; -,otq 3zk5,do 1 qu/nrgimary of a transformer causes 14 A to flow in the secondary. How many turns uozk35j q;s, dg zqrn to,1/-bare 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 inhp/ 1.f5a-v(krbvitx a 110-V primary if the 24-V secondaix 1-p(vf/akrb v.5thry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a(g il7mry1j(t 7 xlidu*lnf4, 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the1(nxl ll7*ft ugirm4 j,(y di7 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 100% efficiger0b , gd1lj/ /swk.kency, h. b/se ,/d1lrg kjgkw0ow 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 s l+ w4j9jv(hqxign transformer provides 7500 V at 10.0 mA. The primary coil 9 jxvwqh4lj +(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 and 300 turns on its secocol)qq xo aaq/ 781eesq+7rs; ndary coil. If 120 V at 2.0 A is applied t7)o8qes/x +o s a7rlq1; qaqceo the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil a6 sn gr*skxmo)44./rzwsq 9gvnd 300 turns on its secondary coil. If 120 V at 2.vx94)g*rksszn s /r mg4qwo.60 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur2/a7gk -mch ckns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currekk/ah m2gc7 -cnt 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 rfmsb+p eo2c 22a*wl9and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outl ape2b9f2r*s wm+2c oput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns andeq -6b-ib3gf k3f/ rhc its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondar-/ icekbhf-q fr 6b33gy 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 currentwmc/-n j.gjvq ulq2az f*w475 at 120 V. The voltage is usually stepped up to 4500 V by5j-jauvg7q 2/ nm cq4 flzww.* 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 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 1r8y:d8qc,hcmu k4qwpjqxr69 t)/h.c 20 V. The voltage is usually stepped up tyj4:u .q6 t/cqdh r)ckqp x 988hmr,cwo 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 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 cug paz5rq9h k-6/cq6harrent 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 power lost in the transmission line if the voltage p-a/zkc9 r6 qqg6a h5his 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 0.6 0y phd8f d6vsj- j80w/. .uhjdfvvau+0 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 as.0/wu6hj j8+.juvvafp d0dvfh- d8y 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 al 00aq irlp1e9 trc 46(fdsl)d total resistance of 0.60 W. A generator prodp 19q0e(0d lc 4aslrl dtri6)fuces 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 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-u g*/xsifq(zg:mh/z8W line at 1000 V. How much less power would be lost if the power wg*/ m:/gzihfx(us8zq ere 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. It is tcyn9(4z mbw,co 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% ofc, 4zwncmb(y 9 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 c2unyw/v f8dfss-*7y. How much energy is stored in the coil's magnet*-8 sscdfyf 2uvy wn7/ic 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-4do;kqwfj s9 6.0-W resistor and an 18-H inductor. What is this circuj;oq-k9wd s4 fit'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 etytz9s32z(h ) 9ljhkwhere the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a m*iri zfk jf3z378kq(g1yns.;h :mkx120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a l cx*vobe.+cnb 4nj+( 120-V AC outlet. What is the resistance of the lablc+x . c4nenjv(*b+o mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 1f(ohv8dqzx4t i(e( ,d20-V ac power supply. What is the peak current thrd eqx(i (v(dzt4of, h8ough 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 p2y*m(esl. i,bqmqjy4 ower supply. What is the power dissipated in the res.ej,4m2iy lyb*ms(q q istor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ak51g*(ixw1/3facmxiwybx 4 x 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 r2el2w1qw2zhu esistor 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 aivni-i 4 uq+5is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor g; 5r p1yhl: b +e3-wum)mhdlbat 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 71 mvhu wz*xkm1. xqt7reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-s1hiwb(cqu// +lhl/ smH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10. w7 *ie,6cqk tqno;ti00 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 inde c 2(upruqqd/vn/3xw2bd bqwlc0d f1b;- a;+uctor when 120 V AC at a frequency of 20 kHz is applied tfc/e;w 2pr0-1dbnx/bdql q;da(q2u u3v + wbco 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-mbxnte3n+ 0 l/jgx0lk- H coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF (e 1ffs y-4:ha;ykynl 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 have 50 W of capacitive reacf5cdemb)lk f2)f3hp6(d s f2otance 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 at2ut98dg lgp4m5a9jl 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 capaciti 15wcscwx6dwxbx+i2pqy 854 cve reactance of a 0.010-mF capacitor be 100 W xi qxcp6c85wc2s45wyb 1dxw+?

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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 1000 Hzi;tdkc1rhi(gb:b.r98w f 5wg 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 impedancec ;m tu fx,by16;vnp5 v7hohl4 of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti6nyfb mvl ;71;4vu5po ht x,chve 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 impedancezwto j,3*z4z4lpvy g. at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF yj* 43glp4o,wtz.z zv 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 ine(b*i grb)* jf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are (*er)*bnjgb iconnected 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 i-tna t3qkb 4l5n series with a 20-mH inductor, what is the inat-4q5 k3bt lmpedance 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 h dyzimue; az)2lg4,*a-z 0ge in series with a 20-mH inductor, what is the phase angle at4 2-,aa*h;)d0mgezu ielg zzy 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 qhkjk.d+0f o 6.njqa320-mH coil and 1.0-mF capacit h0.3 fqjnqa6k okdj.+or 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 sex(mq(h)ub dv3 6 ogr/xries with a 100-W resistor and 15-mH coil to get a tot rxx6 / qhm)obu3g(d(val 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 Hz for a tvbbk8csjj4jz x-7z n4+h j+q8 otal impedzbk8jb7z+n8- 4 jcshjjv+ q x4ance 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 series8nu7t h0 -raqm-vf cw+ with a 100-kW resistor at 1.0-MHz for a total impedan t v+aumr- nfh0q87-cwce 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. Whar,f au5 z(qer9t is the impedance at 10re(zu5f a,9q r00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 * uzex1lc822ckqx j/wkHz for a total impedance oclex82k ju1q/z x c*w2f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phal)y q( y.5v yq/vt wdaa0(f/cz/bwsjr e6n34r s0(nyaq.be4darcv fy(yz6j5r)sv/3 l / w /qwte 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 v.q ,gtm.vtak8z4o,3 dscfh 8 a total impedance of 4tvmgdt,f48. h3 vzakc s, 8.qo5 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 capacitorv ,f3bl cm*l;7 whww(h at 120 Hz. What is the phasew*v 3,clh(; fbhm lw7w 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 f)g(gjo84 4q1q2ox xdlrya 7 eif a 100-W resistor, 20-mH coil, and 1.0-mF capoo)xjq2a g7df4xr1elg 84qy(acitor 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 resistoqcdmu5d y ;(x fjw)i/3r, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whqxd3uwyij/f ; dc5) (mat 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 p-z8w lsy4m 50ajwx7b5o(, zg3gkv vcW, and an inductor of inductive reactance 30 W are connected 80lvs54z g 3z5(gwjpcbk v am7,o-wxyin 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-W resistor, a qejfh,cq r+ 19gmaa 5cqi9 :i,10-mF capacitor, and a 0.45-H indu59, :r19aqa,jcf mh+ cqgiieqctor, 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 v it.f, ldz,qz(3u8z k500-W resistor for a phase angle ofkdutzz,(i l3zv8,q f . $40^{\circ}$ 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 = 204ls0 cy,fo b1r.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tr,0l4y ocfrbs1 ansferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.05w:v1 e 8kubt:)u tzjkw1 )ikr W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplbw )5 i:v:ur ktk1tz8e1)kjuwy?

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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 AC6rnf2oh2otm v (dk lb)96u qx-ri,)je 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 ofh8foe8, n8tf5k,ehnu 30 W. What is th8 nh8 keteho,u5f,f 8ne power 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 for a series RLC circuit contai : xli2m0 pcbx3.zxjm1ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyx.pxj0 1x zm m3icbl2:?

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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 15-9xy u0x3 fxqc)mH coil in series?xyx0f 9x q3uc)

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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 seriesz+. bk:/aw(rmf6m1 sm4ywg pb with a 4.7-mF capacitor for a resonant frequenky1( zbr. /s +pwmmga64 fb:wmcy 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 restof gbq oz*o,3p) kli2/7jvi:onant frequency of 1000 Hzoozbq ,pto7kifv2g: )/3* ilj?

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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 in0vt-p.if w /qm series with a 30-W resistor and a 40-mH coil if the resonant-p vtm/i0.w qf frequency of the circuit is to be 1000 Hz?

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