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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: 匿名未登录  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 8oju5icy(;r p 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 thatc :-bnz7nfd: i 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 /9x xxs4yui /rin a coil produces what kind of change on the yxu/r 49x/i xsinduced $emf$, 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 f 0xfvtht r+;/uield through a loop of wire produces what kind of chang r/ ;+tfth0xvue 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 u ixs+0ex 42msmdbu4.lw c2n:8hetf 4on the inducuhe d4l mnif+0x 4sw2 2 8t.bmsxce:u4ed $emf$, 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 ch rk ciskm.xa9, 79s4magnetic 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 t(m.t o avb.;gbhh*, bof an induced current in a conductor will be that whichgh .bbt,o;(bhm*avt . 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 -5sp9 hnetea5 magnet is held above its center with its north pole pointing down. The stationary magnet induchae5s tpn9 e-5es (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 tablenw 1ulaifs-)q n*w3p:. 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 from a1f3isw nqlu*a-np w :)bove)

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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 th .iq(2 ev48e vdpvqoe3yi7y)d p*7vfae magnetic field vector point4d ave )ov.q77v3p e(e*i vp8qyyi2d fs straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a leiq2sd)3o s(4z7 zuk ,mhru+lmxm * py:vel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced curumd:y7,h )*2pq s(+ kmilzxmuoz 4s3rrent 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 a2dtltlkd4y3 + v k4thel9 -s*a horizontal table top 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 induced current in this coil as the fiett ldv *s234hky4t+le9l -dkald 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-increasi;+,/bsee q wntblug ,,ng current northward. Two coils of wire lie flatsq/uw+bngee; t,,b, l on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north 2 ; wxg0njjk88g e;7ord) fuowpole entering first. As the njw ;8 fe 7kjnd2;o0gxrug8w )oorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whose )hehn;h pc +47nal c2*4meplq direction can be varied. In a region where a uniform magnetic field poin; eplhn24cc*he 7m qhn a+)4plts 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 rozu(zi0.fogy3n9 hbt ;tated at constant angular speed about an axis whose direction can be varied. In a regi;0.y9 ifzzgtou 3bhn( on 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.36ptmow 0n/ h a(m6hji
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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 thu 4- ,p4ze9itnluv9tko :a;otat 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 fieldmzw;n5y +wp 8mq zuv*:. 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 ea,iebu m o+:n8dmgr,7kst-west direction) is moved northward at constant velocity through a magnetic field that points stdk8 eubr7, gm+i m:n,oraight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity h ;:ok,imx5 drw 49vz wxwm9.y$\omega$ 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 tran. n3fh,fn)u ugsforms

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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. Thfblx: ((:ljxkm4g.l9s kc9nx e frequency of the 9 4.xs(l9:klglf(kbc x j:xmn$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used 8g-y jw)jleu :yxb3.l 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 tha3glnfo jcw b,:179 oajt

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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 lo* ljhmp)+q7rfops than the primary coil then itj7mhl rf+p)*q 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 pri 4 nahj9xw*vf)mary coil contains more loops than the secondary coil then it is wf* x4h9)nvaja

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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 pme0,gzx/ xmjw, vtg :0ower 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 4 9 b wst/xo5t 21libtlvs(f tv82puz+circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are con-ooj7kr64nrz)cnmx 7+) , ,xe imopoy nected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo 7xor4)-n6m y,7p xiz, )kjoeoorcnm+ ltage 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 serie nrggjw(-o, qpzht-84rtm5 .ds to an ideal battery of constant terminal voltagednj4zoqtmrtg-.8w5 g- ( , hpr. 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 with inductance L and resistanceow:xj h4i 5dt/9- fg22m hqtuj 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 resistancvywo)t50dar e*+o(kygt 3*u r5fi2 kbe 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 a0 e shf4wi1x55)hk i8s.xdyds battery. The time constant forfew d5 s0xk48 hydih x1i.)s5s 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 batteuxfu.veravo 9-:wxhs 4 -+ )rkry. The battery is suddenly removed from the circuit. Thv xfsk-w a.-rrho+94uxe: uv)e 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 units lqr90fty;4 rq s7ejp,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 a0ss:8qv g5u ojqi8. mon AC power 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 conn fmdd y-)3vi2c +)schkected to an AC power supply. In this circuit, the current)3iyf vmc)cs2-dh d k+

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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 circuitn6u n1 flwui7; changes by what factor when the frequency iu unwf 16li;n7s 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 z(r26*8kl xok2 lehayj1xen, across an inductor is doubled, the inductive reactance of thatok*(kx2jx zl1r6an, le2 8ehy 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 :acu5 6odnn1: :*qgalooezc)+nmvh- across an inductor approaches zero, the inductiveodnvc)-ule::o1nz6 q+hmc na5: *ga o reactance 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, t1ep3xmya fvn* -p d*2ehe currenmy* dp *p2e31 enafxv-t

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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 circuitay4zvk; ha5k3- xya 8z changes by what factor when the frequency is t5kx ; 4azvah-3ay yzk8ripled?

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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*,n+e u 97kn8eqz bvro AC voltage across a capacitor approaches zero, the capacitive reactance of that cn*q,+9vounk ze8ber 7apacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor 7plg 7j/e5k e9) zigrein a RLC series circui7i/p5)egz g ekre7lj9 t?

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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 cir9 h3;b)c xlpsxcuit 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 of the circuit increases if R increases.v 9n vvuz x8sxi,d *njr. ac:,u9dl7;y When is this statementviz ;l: n u9,d,7rjvyadxn.*v9 8scxu 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. z fd3wbcgf0),fl 2pb/The impedance 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 increayinv,4c ib mjd y1-k1-ses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series lxe ik x (6nbno+2xw-,circuit, the resonann -nw2x oix xe(,l+bk6t frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonancq10 qgl9p b-k+dkgbo;e,

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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 RLf i3gbkh:. ip7C 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 radius 0.10 m is rotating in a uniform40j rn.yj g/bk magnetic field of 0.20 T. Find the magnetic flux throuyg 4bj.0nrjk/gh the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiiy(g ym4 ;(rmy/n -qmx js-ha:us 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 fi j/xsn (:-airm 4yymm;hygq(-eld 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 a6sq h no*)kz 8w(h-tsn uniform magnetic field of 0.20 T. Find the magnetic flux through thezqk (8n-os6n thswh) * 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 singl.rv- *fv,zcyfe 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 f.)khym 52wcc r0(jozxj0, r2pzp+g k yrom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Azuah*v:8 f1tan y b,hv3s58c7 ibmta; uniform 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 in *n vhh8ta1i yua5m7 8:3bbs;vz tfc,aduced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an aq6nm gr6b1 u:srea 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 arej wa4d.1;lqs(z ze+ l 3zqwks7a $0.20 \; m^{2}$ 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 qo:eckn/r.6jl c +pj/location where the downward component of the Earth's magnetic fiel/k6q/c :ceo jl.j +nrpd 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 nh,)4/xbf oh:r z /dkfwv*wj. a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet*w),orb/j hff. n4kzh :w/ dxvic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional a8lr6q4hd41r -lc x 2kljdyh6mrea 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 consb1eh4b7ar j 5,b;orr4o,cjj c ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectv8/vr hdb lc( (efkzer04;1p-he ef g/angular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to t;regvd vh- k(h/b0p( 4f1er / lfece8zhe axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi tuov rq0j 6-u5v7pz )+wq kky;p5c9bnre 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 construkv m7a)rr )w+oiybj /-ct a simple 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 coimy)jarb 7wk+o)-vr /il 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 generat:5xr8tmsl-1/ xow7jz. 95a o gfzdmvr or 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. f+w4b63 d hjsvThe 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 motor operatejo,3 t)d7ic lls on 120 V AC, and when running at full speed it g,td jlloi3)7c enerates 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 suppt 24 h2ny-dlrs0qd/c i8eg0psly. The operating cury i/td n0g-e dls8p204s2rhqcrent 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 resistance 6.0 W is connected to a 24-V power supply. Th eox.mr 9;5l3 skqvad b*zon*0e operating current is 1.0 A at full on*9vl*kq z ;5 mr3eadx o.0sbspeed. 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 connected to a 24-V power supply. w*xfgsj(()v t:v 5gaiThe operating current is 1.0 A at full(:wi5t (f g*sxva jvg) 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 vh,q6l yj:wx 2 b48gii/b0opf4s 0 ,qmjbc4llk oltage 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: 93amwzi94rmaq 6zpw o flow in the secondaw4p6: z9a 3amizm9wr qry. 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 man*s g5 u5jia)rky turns are necessary in a 110-V primary if the 24-V secondary has 100 turns5s) ji ag5rk*u?

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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-trvmv,4l(s a5ourn secondary coil. If the current in the secondary is 3.0 A, what is the current in th(o v5a vm4,rsle 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 transforess p 3(p/:3vg dkl/jtmer. Assuming 100% efficiency, how many amps at 24 V can flow in the sesv t3g// se(l3kjpd: pcondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 i-5hid cp2t; bmA. The primary coil operates on 1i52 di pc-bt;h20 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 v09) me ks9 5xuzubds-turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is)kdu9 e05xu9s - svzmb 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 prima;jrin u/b5e15 x1pdr1+cb qxw n+,zdv ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applieb+rr 55d jq,+zun/1xxe; pn11wivb dcd to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its ju ovkax3*x:t )80w97fbep wjsecondary has 200 turns. If the input current at the primary is 100 A,:eb8x9 )jokfxa3w*vp 0t7juw 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 secynas,9yn5 g *ei 4ed;jondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to yjnig 4,ad 5 esne9y;*be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has lmmn( z)katb/bd+q+0tfw+ 4p 200 turns. If tb(m/4lmn++kz dpfw 0t)qtb +ahe power 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 qz:n1kjhg,bvs/g8j 3 is usually stepped up to 4ns 1j3:jhgkv ,gb8z/ q500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 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. T: jsijxyf+epg -vt* :bbt0o(8 he voltage is usually stepped up to 4500 Voesgybf+-v * ::ipt(jt xb80 j by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually st +; 9,i gxlkbvudhdl(:epped up to 4500 V by a transformer and transmitted through a power l( :9kv ibgdlx;uhl+,dine of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long p74fywv.4nhrf8l o:9v/ jsf-z hnl w 7has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmwr7l 4vyzvw9sjhf:fn o n/7-h4pf l8.ission 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 50hy ) i1emie xk:d4.qe/ km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer ise i)he 1x qdk/my:4ei. 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 li2fqqe+(: ji ;oxtm2 zess power would be lost if the power were transmitted at 3000 V instead of at 1000 V? ;o2zi(q2+f m ieqtxj:

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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,k; 2xv,b(:yss7mf u v, gafgj ;;rjow is to be transmitted on a line ww yo;,bkx:;m;g,f7 ,g svsuj v rf(2jaith 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 the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy wf00)q:hyij r/w x8hkis stored in the coil's magnetic fi0w0q8 /h)hw rjyxk if:eld?

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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 ajl)gu:w r):7i h+n czk6ysu)d 6.0-W resistor and an 18-H inductor. What is this circuit's iu :g)cu+)7l )rnh sk: yjzd6wtime 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 t:- d wtj.ay(b; un4qzdpd v2+a; m5nurhe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outle i hdd 18vex+ nz ,niha+:3y q1unn30/mgcw3wct. 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 i qen6+vf*j(gomp +5v-1 ympx120-V AC outlet. What is the resistance of the lamp?mvo6++jv mpgn-*i(qx1pe fy 5

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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 pea2 df-xdz1qg9 e okl6aas l(/z.k current through tea2.fd6gxzs q da1k(9/- lozlhe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dis07k(s pfer/vjgn / 8:p/ijp wpsipatedn pp/7v: fp/e8(g kisp/wr 0jj in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 5vmhaho7un hpd:q8 ,k;d5)uh 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 acxa8vy1t-(nb eh1i / v 50-W 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 resp/3( juk.5wiuy g1wml;ok-mcistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor a(dh80az56butcs c4w qp:6c yi/ ip en:t 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 rekky86 x4q 5cqzf:dc58bgzzw8 actance 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 14j .a*grucp,1.gf o ;bi.0-mH 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/a7c)(uk mey;kf ,xi r inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency o: k )folz:cizef*a,s1zz5gi1 f 20 kHz is ap*s:i fzz1kio : 1clz fe,a5)gzplied 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 )s t1gtbf3(s w3 mdz:lto 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 capacitijt:rd0 1m-q/nk ex)xqve reactance 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 have 50 W of capacitive reactance at 1 w+z6+p;4m enpi8wx ke0 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 oj x pek0f-,;b1nrv q;vnz v,,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 capacitmcgq : r;y3n;uive reactance of a 0.010-mF capacitor be 100 Wqyrc ; :nu;g3m?

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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 Hz a ruyqq *.:7euand 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, 15.0 W0sqz 3mk q43 nzx.sv2j inductive reactance, and 10.0 W cajk42q0sn3qv. s 3xz mzpacitive 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 imped2d* x*v;p :-q8 q ms-ldd9lfna,b mwezance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca;d, d b9x2fepa*smlz wdqm-:8l*v- qnpacitor 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-W resisepj c 6rh7c:0vo1k4motor, 20-mH coil, and 1.0-mF capacitorj7cmovk1 e op6:40rch are 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 inductor, wha b*pihm2k7 wp4)9y8vzb 8ao opt is the impedance at 1000 H8b*zhk o274m8bovapw9pp y )iz?

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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, whatt ;1:gicwoh kb(m6lh6 d6f,tfp:ep s; is the phase angle em;,o fgpf stct66 ;iphkh1(d:: l w6bat 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 20-mH coil and 1.0-y:+4wftpx u*y mF capacitor for a tota: *xp+ ty4fyuwl 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 l*g n-c8chlps+;*gh presistor and 15-mH coil to get a total impedance of h *h*c-sl8p+ gnl;pgc110 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 ep+h (qkq8w (i7 -y(zz gyx( 3ayx-hesat 5000 Hz for a total impedance of 40000 Wzg8 +( phqkqyaz syi e( 7-y((x-3exhw?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must s9 au.b/d+ nb+kjkt *9l*gj86oihjz bbe put in series with a 100-kW resistor at 1.0-MHz for a total b* j/9k869usi gjnd+jbbkzo+ t*. halimpedance 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 conm1 ,stsr/m 4rgk7g8qq nected in series with a 20-mF capacitor. What is the imped rs 8rkgstg4/q,71qmmance at 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 capaciag asa4u76bq qtyz;(* .ox, dqtor at 1.0 kHz for a total im q7.aq u*;adgzq x(,ybt 4soa6pedance 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 capacitoroq5( nf3k-/wjzeki 5l at 1.0 kHz for a phase angle-kfqez wj 5(3l/on i5k 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 fcm: .5xrwgk py cqw10 6)1xcftotal impedance k 5 g16fxcq:cp1xyfmw c0).wrof 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 capac(vlwdp5*jy w- itor at 120 Hz. What is the phase dl-w yvwp5*j (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, 20g pzu5wt .dl96-mH coil, and 1.0-mF capacitor are connected id6 tlp.w zug59n series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, an(f,h q tk1tb-mrp c7irlzkn :c37l f/3d a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplbkk,n fmq (l /7373:c i 1lpr-zhrctfty. 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, an17mv ;pi8l(dl iwv 8ypd an inductor of inductive reactance 30 W are connected in series to a 110-;7lpd8 ivw8lmy1(piv 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 RLi6pd dl4:/xddC circuit containing a 50-W resistor, a 10-mF/dx didpd6:4l capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-(dt9qr,f-sk7 jh 5yq gW resistor for a phase angle oh qjst-yf(q ,5dg7kr 9f $40^{\circ}$ 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.yp i 8/r8pfea-bx5 unsso1 m,80 W, L = 200-mH, C = 10.0 mF. At what frequency should the ciry xubp r8 a1p5oef,is8smn/8- cuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resisbu 4r lj:0-zl(tgh)jxtance, 15.0 W inductive reacta lr -4lxb:zh gjj)(u0tnce, and 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 AC cirt q ebj*fq 9nw,s8*) cw)n:timcuit 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 impedan2jh;l/d rjw )k8idln 1ce of 60 W and a resistance of 30 W. What is the power fact; kld8j)d2 /lwhi1njror?

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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 containing a 50-W resisqd*xbmp-/qj n/ d(hbz.- e h9ztor, a 1b9qj/ / z-en( bqzhh* d.-pmdx0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant f/m:y6q+cn q+3ftgr l gwycephy. 85n 3requency of a 1.0-mF capacitor and a 15-mH coil in series?yynh6 gr3l8e+3m ty/5qp:.nc f cqg+w

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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 ;h:cmf/kx 9u 4mgj2r bo65gtvbmogv5bn .9e74.7-mF capacitor for a resonant frequency of ur 49gh29 /5 7omc; nfmxbvm.5bvg j e:kbg6to10 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 t +os6a(eua/d a resonant frequency of uaoast(d/ 6e +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 bedvs1e5.sz.b r placed in series with a 30-W resistor and a 40-mH coil if the resonant frequed . 1b.zs5vesrncy of the circuit is to be 1000 Hz?

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