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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 flj(r q*wz*zge t51j+ ppux 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 c;ud2g q 7bhv1ik;:qg states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loopp5 1a a 9)ege7ex3sloqs of wire in a coil produces what kind of change on the g3e1 pea5la9se7qo)xinduced $emf$, 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 prodj2mb1ka; /me6 lqjts) 9f xb.kuces what kind k;tmkej/b 2l.6sm x 1 qa9)bfjof 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 loopk9t8nwz - m15, n2,w;uc jjxp nrkue7u of wire produces what kind of change on the inducexw8 w9,j -n71kr5n 2uuk; cpunj ,mzted $emf$, 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 field e ov-q wm 0v fmjb c5c7hi36iu) q;x-up19orv2an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in ar ;oth: u5hs;e::sle l conductor will be that which tends:ehlte::rs; 5 o;sulh 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 fla2 me r01ak )1ddoxiojl, fx4 azvk6h,-t on a horizontal table. A bar magnet is held above its center with its north pole pointing down. ljxe12 0v4x1modo fk -6)kdhai,r ,za 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 hort t/q,yp7hd49hd c0-ybpn w+nizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abov /07,+hyq-b ttnwcpyd9d pnh4e)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic xwj4xl,qpw(c8r2wt*n+b r o9 1 b6do afield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of tbxo w96 x r l(d1ta2p4jq8bcr own,+*whe 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 leve4 he/jguzt d0ie:,5s rl table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stron r jhg 4ie,s0d/eu:tz5ger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontalvi te7eaz5/eew8 ;u+z table top in a region where the magnetic field p7iau+z8z/ve ;ew5ete oints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and cajesd0 2mmr54 b ribtd r8h2n+8rries an ever-increasing current northward. Two coils of wi8 2mhmb e4dj rrsr5t8 b2n+d0ire lie flat 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 pole entering fird0 g/:, vwur7cd b9dxnst. Asc 0b97xv wgd/u,d:dnr the north 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)xz bcyx;r6t6 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 axix6r) yt6 b;zcxs of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an ax.hkovspinr6 2t4n2 .eis whose direction can be varied. In a region where a uniform magnetic finvi p.6 hkrso4 .n22teeld 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. 2,gvpecz( *v.p g9atq
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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 an d00e )zxxc sr7$emf$ 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 field. Thm2u+sp+a/;s hecz.t we $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved noe3/ wnm 0)vvxjj; 2 4ch,vm4q y;bzzpirthward at constant velocity through a magnetic field that points straight down. Make a statement concerning 42v/y,n 4c0m i)jeqhv;3mpw x; jz zvbthe 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 royj+bf h8, urua q9h0s,tates 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 t*e+0 qdh8md.wxt x l1j w ure2-f3d :a;doqa,eransforms

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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. twx 6eo 3xri(6 The frequency of the ow(6ei xtx3r6 $emf$ 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 usedcqhv)85: v gqt1qwvz8d fb;q i2 lp6(o 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 devic),*k1pds+xt5skk 0 ;cz xzps ke that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains morehf5wmqq* b)n+ 5snqw+4 x8;g e0hh jwr loops than the primary coil then it q8n04) wghbx nq msrfh*+eh+;5jw5w qis 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 thel6c c ,qyqv7(9lfmi7 q0kzsx c/)aj /p primary coil contains more loops than the secondary coi/)j qlpc m0l6f9szkcq yc/ 7via(xq,7l then 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, thki16jhau u4;eq g weai;29n8le power 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 c,tx0n bxuk+ :, yggf7vircuit,

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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 c0 ll 5 n wwivx6qvgk,k2rbs7ke;. 1s+connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bat0vn,qsbs2k6v+1 c5 ;7x glwk wir.elktery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cr(jn lhpl)t9sz2 :b0 konnected in series to an ideal battery of constant terminal voltage. pjs9(kn0: lt h)b2lzrAt 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 resistance R is connected mr*vx85xljpysb no jn2;a99 8to 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 to aqj 3( l w3lrdibcr(c8)n $emf$. 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.uhyzm/zngyx7p0 -f 0g* 6/ ays The time constant for the circuit representz-y0 hs ygzx0f* nuyp/7g /ma6s 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 battery ck8 xtbo/u w.jmncf3-p6m 3;2me *kdy)te2tr is suddenly removed from the circuit ;m*2eu63)k tbwtx.k c me38t-fj/r2pndycmo . The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following haveu.kf r k0w bo3pwutb9i184vl) 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 power supply. cno 1beb3 hw x-0qq,8n 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 circ5fad;lci,o,: poop d .uit, the curren:oa5;oopfdc dlp,, .it

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance h5t00zo0junk0 pe4q gin an ac circuit changes by what factor when the frequency hgnk 500 uq04ptje0ozis 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 across anq(cisu8 - 6puo inductor is doubled, the inductive reactance of that induc6oi qs8u u-c(ptor

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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 /vml kp7p 92d f55ibhsthe AC voltage across an inductor approaches zero, the inductive reac9m5lpi 7v b2h5s dpfk/tance 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 ukowkx1pkzu9. s(3-br3uyvv ;b m .2kpower supply. In this circuit, the curre2 1-3u3 yuvkwbu;obr.kk 9 (m.svzk pxnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance ikyqpp :7)dg+vs9k 3cs5mjh8xn an ac circuit changes by what factor when the frequency is tripled? kvpp9shs)gcqx73 y+:5mj8kd

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, tu9hb:+jw:w q ohe capacitive reactance of that cawq b +ho:j:9wupacitor

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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 volt1,.4u5bp31e0g ted2oc uynbxskc sq 5ages of the inductor and capacitor in a RLC serixuc s 40t c.e51eqounb,sky p5d3b g21es circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circ8i 8fp,b daix- fom*w3uit 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 th t;ep c n9nekm/prq7:9e circuit increases if R increases. When is this statement truenmtpp: ;7kce9/ 9 qnre?

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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. The9 rcp fc,:wiy:5-/gnpe,ye4ht gx qy: 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 imc-je r.,e9 bd2z3g*5tvp8 h 4zgx6 6pru mmshzpedance 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 the capacitancf vb,(em/.k1pmvf/5 q1uf gts e both double in an LRC series circuit, the resonant frequency sgt1.m vf f1bu/ p/ ,mfev(5qkof 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 thw nf kf*84+3 blada7lhat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whe +3uax0i5)p 2ca xkuqk(z8dg s* ka+vzn

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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 uniform magneti 21ulf7ishi sqm8+7paqn ;zu)c field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetis1mqf; 7squ l7ipna82 ) uhz+ic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m(foskb,qlz. . : 4.3lx1,vyimzb is3nd3euzb is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux slf1xbz (.nzuy4v..q:s zb33,mkii,oed lb3 through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fields4zi6r i2m2oy(nq /-vjy) ylr of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andq 2 i/yj6 syvly4 2r()zimno-r 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 ag j 7+m 8tx;z/kmul(aen adjustable 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 coig2+v g g vrk2 )gb+exsm03zy;pl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 j3n+6+k2pb ,2vwqvafts 3iqr cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifnq,3q+j6vf vpit2ak2 bs+ r3w ormly 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 witz yo: 2+c(fauzh 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arw b0: 1xs+x4 4gqmhxorea $0.20 \; m^{2}$ 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 wing6 8) :ormj0yvb8url kt span of 60 m flies horizontally at a location where the downward component of thrj r 88k):6mot vyubl0e 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 rotatsg e4d;ptq r3*es at a constant angular velocity of 2.0 d pe;3rg st*4qrad/s about a vertical 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 generator has 50 loops and a cross-sectional area oowz ;z2d-n6x x89 fbx:ugeq 7sf $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofc. l8v obfok-w7*de+u area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armn pr5mwm +;;7rxc;s xkn:b5rmature. 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 ispx m;5rr7s;wmrxbcn;m: k n+5 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 100 turns of wire of area tg n3 wn+n g 8;-at70vaa hfk )j7dl7g+u/alvx$0.090 \; m^{2}$ 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 pp ky9b x+-;sna z+t+u17chcqx+ hg6loutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0cgk ap bhxn+s z1+ ty9-qhxp+6l;uc+750 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 maximjann0 vyg d ,g*u6l)0ty,qnc4 (dmd;u um $emf$ 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 ha/f o(sg,/ uffr58q ymsve a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a r5lo b gmtpr9-.gym 85jesistance of 6.00 W. The motor operates on 120 V AC, and when running at full59o brj85pm-myg. tgl 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 to a 24-V power su)zz38 kyvmvy eok5 4w8.l 1smbdt7dh5pply. The.8hkd4 es 81 yl)kbv55 mo37tydzmzwv operating 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 r ex8)i 6azw lesscv7gs 55ve((esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spe5ee)iase86sx((c l vsz7 wgv 5ed. 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 posp 7yatv s1q+5wer supply. The operv5 s +pasyt71qating current 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 vc9l(gy. 2 cxyto reduce 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 in1g vq*j(deb73/ )vfxxe 7kypd the secondary. How many 7x 1/* df)v(y3xj7peevgqb kdturns 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 ma meu0 vjl+t.e/ny turns are necessary in a 110-V primary if the 24-V secondary has 100 e0v j/me.t u+lturns?

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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 *v ic+(ppw2ew a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wh* pic+ vepw2w(at 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 the primary of a transformer. Assuming 100% efficlas96-. cn0pi/ jq tykiency, how many a y.n-qs 9k /j06pitclamps 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 sign transformer provides 7500 V at 10.0 mA.z,pfl 8jdqg5 2 The primary coil operates on 120 V. What does the pzfqd8 jlg2,p 5rimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has k;0q.roi (, wd5h1-bmq mirct60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prori cb;iqt w0-m .kq,h d5m1r(imary, 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 turp a2zl5oh )acc1t3y2 xns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A i 5321 xpctacazy)2 lhos 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 turns and its second 3tl)wv eai(:9 2m(zqv r:vxwoary has 200 turns. If the input currvaov vr:x 2(e9) mww tiq(z3l:ent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu(f sw8 v xl92d(die2pcrns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to 92c(v82xsdl i(pdwef 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 wdj8vej h; 66bo*yg3phas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fri;bygowd36vj e6h8p *j ctional 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 is usur 4 lzsm.6frn/ally stepped up to 4500 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 prsr4m/ zlf .6nrimary 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. Thi o73urjw84.c* bz glue 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 powj*czu8b l 3o4wri.gu7 er 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(yed)qnhczx6f (p d :9 is usually stepped up to 4500 V by a transformer and trandc(zy69) nh dqfexp(: smitted through a power line 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 k:e4t n7ffq,*af3 qfu+g x ;ulwm 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 rati;q+q:w*f4l7gf ufn , 3axef uto 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 resistanc g-pie tk)efirtm b ,+o:mthx,tj :26 .*-hfcwe 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 rat6ct: ,behi i+mx:wf kr.gp2 jm*, t ho-)et-tfio 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-W line at 1000 V. How much less power would btxb3 aw4m1t5be lost i1m3 xat54bw btf the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tr )xh5ht zm* itw8r;w;vansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppervtw*;h;m t )x58zih wd 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:d d d5cz.bc6f energy is stored in the coil's magc.5d: cdz6bfdnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-sf.iyh 5 h/2qyH inductor. What is this circuit's time constans2y5 . h/hiqfyt?

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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 mr5ubnz, 3; nuvui:u)k *w5og in an AC circuit where 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 120-V AC outl6v 4c a5,bzg3d9buamsvy/56temxo , oet. 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 is8 w*e*hqk 4ip kek*xdx6 f9a.i the resistance of the lamp9 p*aqk*8ix6d k.h*we4efik x?

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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. ;ez jgi;h/g dy-b;og(u0 ygjv2co71aWhat is the peak current thro( 7;h ygajc1vgoo;j0 ;b/gi -gzudey 2ugh 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 t7z8 b4emorfn0c0 ;q-fq,dyz power supply. What is the power dissipated in the resistb,ffdrtqcz0m7 oq4- e yz;0 8nor?

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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 resistosx9.b3s+df. ns zl-x er 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 resistoyx 7-ebel5:lf 1zqnay(o9fa + q(dba uh0he18r 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 resistlvu1: gb.2r.nb pd-+hlhpvb)or 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 at 60 Hz?ag.:p rp+fyks +/t(c( f:xclb

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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 p ,vkgb4 .hfv *un(us0reactance 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. hql5r b*9kwn58:kiv hm tip,-tqwy;x/9n ce: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 forqx +rqgj,p+ql2;jpa 7a*4z wx 157 W of 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 fre1o7 jzmtzl 7mck j;88dquency of 20 kHz is applied t oz87m ljt8m7j dkzc;1o 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 0gy;0ffeo1f f 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 reactancec/yu05g9ejbei ou j+/ 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 0f8y/z1rjddma3x 1(tx7b e a5ej kml, 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/s/ /u)d lmi2qs y4daj a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1 8 0 ghxheq) ui0 a7a;w9gl5gbcgn;ht600 W?; nag ;0lbgc hg7g9ih0u56 exawh)8qt

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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 capacigcznx 3p:/ ;dttor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circu/x6lzth,84btsk 0 yq tbf03( jy; zu kdmrq0.bit with 12.0 W resistance, 15.0 W inductivej4m3s8u/ btbqzb ( rt 00tldqkfx yk;0yh.,6 z reactance, 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-mH coil,m x2 p 2c-7t7cbd. ep0dosnra: and 1.0-mF capacitor are antcm.oxbdce 202p d 7s7-r:pconnected 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 a2g(tcc+kzm: n t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected inzm+c ktc 2(:gn 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 in2;)e xt n0 l+qkqoiu7u series with a 20-mH inductor, what is the impedance at 1+xqen;ol7 0 k2u)iqt u000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH i/b*iwxj 2r4zvsq1q :dnductor, what is the phase anglzwqdvq1bxi :r2*4sj/e at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with s gbwo.rpa0ek*3.0loa 20-mH coil and 1.0-mF capacitor for a total impedance of 100 ako r o.l.b0psge3w0* 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 resistor ag eui-s.z m,r ux;ow7m8l (ya4nd 15-mH coil to get a total impedance of 110 W at 2000 Hz?y;leu4rs8izw- 7gamx (.um, o

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must bh- yj v4ofqgt2efi t+ +,gu4178qn kwje put in series with a 450-mH inductor at 5000 Hz for a total impedance o wgij4ufj 81h-,f + k q2gqt4t+eovny7f 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 resistor at 1.0-MHz f(0 mvqzjsdkyl; z-,d. or a total impedance o.zvzy mq(lj dd,s-k;0 f 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 seri 4byjp la r;qfn q;(x0tl-9a+ves with a 20-mF capacitor. What is the impedance a4p r-lfj+ 0; nlq(yab;xva9 tqt 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 capacitor at 1.0 kHz o(be9,f)tmn a for a totan)bf9(oa,m t el impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phasp2sxsy c35b81hkq9 o ne angle of9bkqy8 1sc op3xh n2s5 $40^{\circ}$?

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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 seo:/ tu.eb/ amg)2od4y +cpyfvyb+ x/ mries with a 30-W resistor at 1.0 kHz for a total imoy m+4cf:yy+ xopbum / a/.dbt2/g ve)pedance 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 125p,y5ldy)9 1d dgzpmt 0 Hz. What is the phase g lpd5,ypy1t9zd)m5d 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 1-7e0 w)d t vrpf3zvw d4/hbwg5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieg3z0e tfw7 d/-vpwv4w1bh )drs?

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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 capacito1mpyx4i c1o e7r, and a 0.350-H inductor14im 17poxc ey. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitgwufjem:2v(g8k) vgn3 n 45q xive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. ku8evvm53 :(njgxgn)2 wf 4gq 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 con kb ixcv pk6lmdptz2d;, a s*780)by+gtaining a 50-W resistor, a 10-mF capacitor, and a 0.4zs8 *p 7bdl 6 g0xctkbv,ikayd2p ;m)+5-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 sep8rfy t7 o,k xmpm3wm. x3q(w7ries with a 500-W resistor for a phase angle o(q7kfr ptxxw mw .8mpoy,7m33f $40^{\circ}$ 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 vf nqfy4m x,ib-7n,.ahas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tra.,y7b,a- mnivx 4fnqfnsferred 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 -rhaaq)o( .bx W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cq ah-r .boa)x(onnected 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 circuit 827d:/ vxzkpil j4koan 5e5g vis $63^{\circ}$. 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 oie/osk.vk* 7kisu .tq* r50 axf 60 W and a resistance of 30 W. What is t k.qu *0.oevx7*iksak5 tr/i she 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 contain sy) 5vushbq:e,9zh3: czchr *ing a 50-W resistor, a 10-mF capacitor, and a c heh 9h*q)z: ,ysvc:zbr3s5 u0.45-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 fv yba1( . n6n h0x2irji38a+oc;dggr)fcwu3s requency of a 1.0-mF capacitor and a 15-mH coil in series? 0orcfx ngu8r vacw31+s)jhg3i 6 ;bynd(.2ia

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor forgz- gnodnud84zd0mo1s;i - z ma o)a48 a resonant frequency of 10 kHz0nmg8o i8dz;n- 4 - s4)udoaazmgo1dz?

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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 fr(0tka4z*iubzs,t( k:jnkd 6r equency of 100zun ((trkj4sb*ki ,6a t k0d:z0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in serieeyk(l 9rwc4 p1)i3 7n dekq5gls with a 30-W resistor and a 40-mH coil if the resonant frequencyl)pq1 l key3r w5cg(7 9denki4 of the circuit is to be 1000 Hz?

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