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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 except2rb9u dbv0fak9:u8f u2u,uq a

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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 thatku zh,-np, :hj 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 lou qo0(4 (qpf2tth 2gviops of wire in a coil produces what kind of change on the inducep4ut(h2 (qi tv o2gfq0d $emf$, 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 wire produces wh+df v 5+lr6enuat kind of chan5+e6 +furlnv dge 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 :je fv rrbz:(w e/odnwt.pg2745vq /kof change on the induce j425kve w/wbtqrogrfd(pe7.n: /: vzd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiellwh4q z(a5 ypc/ 6, yb fj2n(v5odki1sd 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 induchy* j7v/oh /hqed current in a conductor will be that which tends to produce which of t*/ o7hh/vjqhyhe 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 magna/ nb zle0ljdee 890(net is held above its center with its north pole pointing down. The stationary magnet induces (when view(zlj/ l0en9ae8n dbe 0ed 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/a,xvvy/ h esxki61u5 its center with its north pole pointing down, and released. As it app6a1v,yxkui/ vhse /5xroaches 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:fk9kt+6ie-m +ujb 2-zy kpol* i jgbq;.ed)b the magnetic field vector points straig + l+b*eubi im;do-kky.q-p62k )ef9:tbjz gjht 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 level table top in a region where th.lt gf7g,tb e-e magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed7-bf,telt .g g from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic qs 5zj u8o6oiso 9:+e*pws2 qdfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directss9ozuq6s + 2oo5wj:ipq8 *d eion 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 18q gbxwl6g- tn2h4apever-increasing current northward. Two coils of wire lie flat on the table1-bqw t 6la h84n2xgpg, 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 pole ent10a7irn w ;yow0 pb7qhering first. As the north pol ip70bqoany 7hw10r w;e 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 abt2r-l;v qo)lirm1-t k 0osa0r out an axis whose direction can be vart2q )rvls; lromia 1t00ko-r- ied. 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 w ,/ ay+1tmrg /y)dkoqvc a8wg1ire is rotated at constant 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 oy/r,k 1 q/yg)d+8 wcm o1taagvrientation 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.uid4tco:u*m (
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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 af1 zb rb7m* b54qjnp/ln $emf$ 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 fieldv i9 lnctvd/ohm np(x2gf/,(9. 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)tx6.2vknjeg0v+i xnnycdd : 3:fqs88 is moved northward at constant velocity through a magnetic field that points straight down. Make a statemn8xv2id c 03qn+6g :y:ke xdf. t8sjnvent 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 consphp/ g4hyjg 5ri9/(u/al -o wetant 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 tracjzw 6,/.eyec t9;1yyp0i d vxnsforms

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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 frequency of 2 :9z .1gamfnk pyqq0lthe2n:mfqa.p ylk 10gq 9z $emf$ 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 devi dx.d6q5zmj 2ice 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 7i umenn852j. 4bdzn, s1v clpthat

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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 mofxzn8o3s+er x5t +k o:re loops than the primary coil then it itroxe3o z+s f+xnk: 85s 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 ta hvm18inu9i da (1w nxpqr2/-r xf(d.he secondary coil thenwx(9(in .8vq/nxpd 2r f- amadhu1ir1 it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power in8-v22 7)ucedu*yr(icui p nedput

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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 resonaj,.l be91fb smnt 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 conne ko. utn7m31tvcted in series to an ideal battery of constant terminal voltage. At the m umt73.o kt1vnoment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induct5: -cbsnp 2u-wn o10dv dwaph4y2sfvjo0b88 tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thsycpovh 1b4-f80n0dp- wbwav tu5jn 8os2 2d:e 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 resistance R is cog t7o msegn8n i2s,hd71hf 6(rnnected 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 tognw:tx96:fbx u tl7:(v l1; jicsb(gb 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. The time cro4 f/qrr uwc.h:l1wy* 5jka9onstau w aqk:lyr 4rc9/* fw15jhr.ont for 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 1 bt lwfs9rjs 4;*kc8mbattery. The battery is suddenly removed from the circuit. Thb*98jswfts;c 1 r k4lme 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 same3dvlcr0sgj um 9;m20p 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 power supply. O s6u z) ex3iohp0wqi:3n 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 connect): h5zna d.0zexgc v0fed to an AC power supply. In this circuit, the currenfh5gx z.zane)0 cv d0:t

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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 factor when the freque:ab.vuh2d u:c,5 wx4b;j xg gtua6jj+ncy is tr hugd,ja+6 ag j2x5vxuu:wb t.4;j:b cipled?

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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 across an inductorpgh *kix3k/jr 0c9ne. is doubled, the inductive reactance o pjgi0*c3./xne9r hkk f 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, thenw1(,ucq+ i ppu vt/4a inductive reactance of tavpu1( u qwi4t+,/pcn hat 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 curru3*m( osr(pczens( o m*(cruz3pt

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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 wh gv4 +aymky6x,at factor when the frequency is tripled?k,yay 6x +vgm4

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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 volta8j5j uiscp3 :25eik; g/wuiobge across a capacitor approaches zero, the capacitive reacta jjui s3;ubo2gi8:c pe/k55iwnce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the volt5 6lergl8hpi3 3xi:fzages of the inductor and capacitor in a RLC series circulfpei 3hr:gz8 5i6xl3 it?

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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 anpy88p nl8ab9r RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if ev (xx+t y5,wzk 8dvh:R increases. When is this stateme(yxwe x+ zh:vdk58,vt nt 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 2ws2 xlv/ sr/ crl,hdy4 r5t7rthe 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 j3j7jfzb3k 9f circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and th,swe (p8h+x2 i bl8lswh7ghx 2 ,btjk;e capacitance both double in an LRC series circuit, the resonant frequency of tha2 iklt,7xs whws8,ghb2p8 e;+(l xhbjt 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 resonc8+e r ohf2p2nance,

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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 cir8;1hzcqbg 7 lep j*k*r bbsi+/cuit 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 rat3kba i3c/x*9 d(au gkdius 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 a 3k3 /(kau9xgt *bdcimagnetic 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 radtl 80yphlk efq 32in 35odnb0:ius 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 the3d2q 3 yeftp5blh0in8l 0:nok 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 tbe h/;qgm+)jx.zwg3 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 a3)gq+xmb g ht;j/ zwe.re 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 isk1/4sb vl axpo2 s8ft,bsu:w- 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 chsw,oqn;r xsgegn 8;+tu *su z400+lk zanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns )pg/ f4s io*wtof 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 from 0.50 Ttp/if)w* so4g to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns a s04wwgboxrkig,v, su,.51fd nd 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 an 8i 46k--ktxt ieudzcq 3lh/e4d 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 where thz-/r. ekorh, te downwa,rk/hro tz -e.rd component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates o,cr6.p q fwc3at a constant angular velocity of 2.0 rad/s about a verrpo6, .cwfcq3 tical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generato41xv y268tyhgc10dqpk i.w.fj7dt gtr 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 consist /(rygsg7lfatg d (z:*s 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 rectangular loops on ihmv gtt.x 4pj;,8qai q3; wbiw 1u0wm2ppar1.ts 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 the axis of rotation, m .aq3.42 ;p1bpvhitpg,wi0wr8xtjaq1m ; w uwhat 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 wire o)keh2d+d+mdlccq ,k nz +ljx-s ;l 1*mf 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 with an output of 12 a0a53aocm ch c 44qqhbsf -1+nV maximum when rotated at 60 Hz. A magneq4 -m 1nac0fa 3 cqchsb45a+hotic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a m6isp: + pxr 3meiv; jn7fmtw 9jl7i(*jaximum $emf$ 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 mot2z9hy yt:w z (w) m+l (um4(bf+mngbanor 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 DCqo xwtr ,im1n*cb*hx68bdh54 motor have a resistance of 6.00 W. The motor operates on 120 V AC, nr5,1 *miwhotxx bbh*qd6c84 and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t to21wzcgvov+5ho+b5i06 qk to a 24-V power supply. The operating cotgk++bo vwi2650q5 1hv ctozurrent 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 supp;uk5yt/a pnj0+ oy 6a.yq4t mxly. The operating current is 1.0 A at full speed xt/ jmtn;ypyquyk.5oa4 a 60+. 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 coup0f -r;6u4hstczl0e nnected to a 24-V power supply. The operating current is 1.0 A at full speed. Whattrs 0z;l4p 6eu 0c-fuh 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 redu t;gbb3r3z; 1xh/nixfce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secontjzv29 m)nwhpx:y;h 5dary. How many turns are in the secondary? xp2j;yz:5h )9hw tnmv

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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 nechi+ i qrz/60eressary in a 110-V primary if the 24-V secondary has 100qrir6 / iz+he0 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 20g 3ve o3wbj+ -w5vnu :i2mi/so00-turn secondary coil. If the current in the seconi3voe3+ w-wbuj52/io v:ng m sdary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in t/7p.gszbq 4 yrhe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flowzrp.q/y 4 7sgb in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provhfgfh 9gcbc6 ,u;(7gq ides 7500 V at 10.0 mA. The primary coil operates on(9hcbu g76g gcfqf; h, 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 ibiom5 h0.ivplc0 v**g ts secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in theov*05im0 cih .lbv*p g 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 63t7mud 7/ckqg 7 wpx: /2guyxl0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thycp:w m7ud g /3uk7lg7xqx/2te secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsxwqd331 +z:xa+wuvdxre ,)cpg +zt*zgba2 4u . If the input current at the primary is 100 A, gr43ewv uaaxz1w u xxc+gbtp+ :qz+3 *z,dd2)we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tusxky.bf/x 0*:- vsacprns. If the input voltage to the p *p.y 0f/kxasc b-s:xvrimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.ft/pg;j i06e r If the power input to the primary is 100 W, we can expect the power output of the secondar6p egr; t0fij/y 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 1204v(j7.g/ tp q vwiod7b V. The voltage is usually stepped up to 4500 .7i /d7 (wgjvvqot4bp 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. The voltagewd z+r-zmyiq:2q n(j , is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. wdi +:qq-,(2 rznzyjmFind 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 stemh/48esml w xbb.b8d7pped up to 4500 V by a transformer and transmitted through a power line of total resis sbb8lx 78mwb.4/ehmd tance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total md0 7rxwd,ocai- 3 2qcresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatin2oi aq3r-cx d dm07w,cg of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genera4 co)a*tz-z+kw,rr dt tor 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 percentag 4wtrdrzac-*+z),t k oe 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 oe j juwz14s(cpg yh1h7s): odket 99;down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instehuop yg419 ;w:7zskc 9oe s1j( )hjdtead 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/l g8dcbws-lv:7,rw n w rna.r8-c*kq is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in c-.8nrn*rbwwc,g d8w vsa7:lqk-r/l 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 gjna8jeh b 9;+et6-un energy is stored in the coil's magnetic fieja;8u- 9t6jn nb+hge 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 a 6.0-W resistor and an 18 1s)ze cqj55vs-H inductor. What is this circuit's time vjcse5qz5 1s)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 volgpyq/ radmq 0i1c368htage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. s ;b omgn a f8)l.kqtaxoge(0h,0 30ja 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 120-V AC outlet. What is the resistance of -bb .; qzj j f1:t93;bf9o nagrl bs,kyfil2l,the lakoj,g:nbl a 2 b;ffbl931s b9i-lq; ,r t.zfyjmp?

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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. W05egoi*-)pdu mm bwn7hat is the peak currentmd bi* 7e5onuwp )0-mg through 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: lz-,o(xcgba/ pd.dn -V ac power supply. What is the power dissipated i.pxcd :/(bd,o an-z lgn 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 50hdm ) kqtlmtx m d:6nw 5pse6j1/*m1t6-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 resb 6.o0o ap vptosy8c .u;h;a+gncy ap+*e:d(zistor 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 iu dg4) 0mkokool0w9 c9s $I = 0.80 \sin (240 t)$. 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*w l1 sljl8bx8,fb5rp 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 reactance of a 2.50-mH-x o;9 01t yhtev2bnxy 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 lw1pgarz9 5zu5a cs(- 4wmta. 14.0-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 inductive reactnqib0 n 6r +ji5: qoo*e;f4jvkance 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 g d9qafx;z5j6of 20 kHz is applied fdj5 zx9a6g;qto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.lda1/9pm) zpcgv0i6o9o- jug1ry*tn 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 reactao k w:tl0-:uvcnce 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 ,rj,r2f i /nhsneeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does dacppu 3twv l ((p(q ebb/u7), *nkk1na 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.o6c04adwpm ; d010-mF capacitor be 100 W?owdd;p6 c 40am

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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 Hqpi; +l g,slauhnue1q8 k3g9 )z 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 circuitwjl o+piz)d7 3lc2t8 a with 12.0 W resistance, 15.0 W inductive react2+wzo j8ta3ic)ld7 p lance, and 10.0 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 impedance at 1500 Hz if a 100-W resistor, 20-kl;/jct;a loe nhr/d4s5 nt.uyrk61 :mH coil, and 1.0-mF cap1sy nuc;.l;/trd : tkja654olk/henracitor 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 jka:9c)dlvha108d yt Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capachjk0)t89d y :vcl1adaitor 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, p5qmrmq) u( avd(hm -9what is the impedance at 1((vrmdm5auhqqp -9 m)000 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 seri hk*wa2-roup 2s8sua. es with a 20-mH inductor, what is the phase angle at 1000 Hz*suk .a wah2s2r8 pu-o?

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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 serie t) jh:2iuu(sds circuit with a 20-mH coil and 1.0-mF capacitor for a totalh)( d2sju u:it 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 l w *8w(umcgzo7)kd9uwith a 100-W resistor and 15-mH coil to get a total impedance ozd)u8 g9l7wmouk* wc( f 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-mox8 davd.3pj x-.5mlhegl3( pH inductor at 5000 Hz for a total ixahdpx oej- .p38(v5.dl lg3 mmpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW re533r hirpmz .nsistor at 1.0-MHz for a total impedance of 15 zpmn 5h.3r3ir0 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 sk6)ofsiv7vcm r2t96x c 2hl f2eries with a 20-mF capacitor. What is the impedance at 1000 Hx6rfc 2sflv2c o9)m6it7 kh2v z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needejj ocmgt o* -:g:2pr3cd in series with a 10-mF capacitor at 1.0 kHz for a total *tgjoo:c g :2rc-mpj3impedance 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 cd:vd 9v-pn5i qi/ie,o apacitor at 1.0 kHz for a phase anglndi, qi ovp/e: v9d-i5e 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 ksbe .hv3:cqi1Hz for a total impedance cs. heq1bvi 3: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 Hw 3h/qcng7yn,z. What is the phase angc3,/7y hqgwn nle?

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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 tqnjq,h;:c ,* b6qmpfcoil, and 1.0-mF capacitor are connectedh,6cq,*q;btqpnmj f: 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 resistorvbn:9w7 ngw1 :v+ tx4+h kczjotq m;,v, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms czvgxn h,tv+qb : jwn9v c4ow1:+m;kt7urrent 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,)w c3jvqh.vgdq0;.u y and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circj0qy w;qv.)3cv. hdug uit?

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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 resist;.iyc 8as*dg:1n dwksor, a 10-mF capacitor, a*a yi;ssd8w1d.:k n gcnd 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 wit674xk l6 jsjdfh a 500-W resistor for a phase angle offldk 46x s7jj6 $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequefg9zl7p:;i 7px a *rsigmk3, fncy should the circuit be driven in order to have maximum pow3g *,g f7xrsazmii pkp9f7 :;ler 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 outp *9lwcmnz0n 4kut in an ac series circuit with 12.0 W resistance, 15.0 W inducnw 09mkn *c4zltive reactance, 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 cfp(rfry .oafbv81 0 n*ircuit 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.r*a 1w;e bdan; What is the power factor ne;wa;rba1d*?

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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 circuivll/ 7z+ k6vxv4gbn 8gt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, z/g7g+v v8 vxk6b4nl lwhen 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 crjc(xe u 0al: n.tlg37dr; ieck +))mzapacitor and a 15-mH coil in series?meg+e)ijnk) t dz.:rarlc (ux;c l 370

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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 series5 y7xqgnns 2dokv710q with a 4.7-mF capacitor for a resonant frequ50gv 7nn syk1qo 2qxd7ency 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 resonant fr2niyalut aho4.kpqhy;yz tk/ -y()34equency of 1000 Hz?. 2iz4p)oky4ya tthlykaqyhn /-3u (;

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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 andx i37actv6l*m0v9b 4(tvvrbt a 40-mH coil if the resonant frequency of the circuit is to bet livvb07 brm36ax9v(ctv t4* 1000 Hz?

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