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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 unj)uq na*jh8.8;/lpze boumdv1.dn3 y * a i*khits of magnetic flux 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 stz;1 rn- k-rs92dzaamsa;y qc1ates 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 o z8byc 1q-3rgu3 pps7ef loops of wire in a coil produces what kind of change on the induced7zb -e ry38qugp3c1 ps $emf$, 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 thro2j:jz vlptzousu9: v klf :r9a( z.1b3ugh a loop of wire produces what rf3v:t2zl9lo uvjzzu: 1 j(:psk .9ab kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind gm0 y8a07 zgfqof change on the indug0mygq8f0za 7ced $emf$, 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 h95lh+asbg c j;t50bxfield 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 2vv8wx *y f(ii,q ( ha9 f5gjbs )rtfspm48e/binduced current in a conductor will be that which tends to produce which off( f9 ivx 8rs,pg m2f4v(t )ba /i5qhys8jwe*b 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 xns-mtvt)fs e h b ;*m::/dsl),;uhmz bar magnet is held above its center with it*mbv)n hdmum; z :h;xs,sft)s t /e:l-s north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hel4;ef0 mhlfz13jlf c.x d above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces fc0e1zf fxm;h3 jl.l4 (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the m1tc(aqazrp5i8 clz6 3dc5 to7agnetic field vector points straight up. The magnetic field vanishes suddenly. c t68 a d(5it3rcp7zl c5aqoz1 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 t /wrc:dtm os( vqn4p+f/e,n: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 current in this coil as the field incms n/ d rvn4 woc/t,q:te(pf:+reases?

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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 mag(/-; nohb-wrf7* )loqrpdqk qnetic 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 field disappe;(oqklrq*b fnq/-d hp7 o)- rwars?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing c(1hl0a9uy sr3 ,8xzk 4 bqlhf0lcxw c-urrent northward. Two coils of wire lie flat on the table, one on either side b0cku ,04hlyx 1zl 38l9xcw-asfqrh (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 no5s+z ivle7(manbm rm5y-ze(ja*5 vs6 rth pole entering first. As the north pole enters the wire, the induced current will be (as vieweda ais+j e5n6 5v(lzrmbvzmy(s5 e*7m- 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 wi gm30:byjwrbwrgyi )9.)ga+ u re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnig yygr) w 0.brw gm39u)aj:+betic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rota 7-iebyckv0,uq re/* jted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiel0uj7 *iqb-e/k ,eyr vcd 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.,ugfgmc- on 13v4x. vi
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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 jjdb-z.:rwb4 $emf$ 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 magn9ju +hf gkc *0mzk6)zpetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west deub fp7 xazc236. mppqj5,)nlirection) is moved northward at constant velocity through a magnetic field that points stac p)5j.p27e,x 6qplzmu nfb3raight 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 angulatr rs,4aj,. pwg f2b;hz dm9t;r 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 co6 3fe 57 dfi, /z/ zl;rnbl4kltu2j :q.lrgqtransforms

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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 o+sz4b sd+7jn 60 revolutions each second. The frequency of the74j++ szdbo sn $emf$ 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,ya wno ,-fv+t 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 thpa++oeo7 kr 7 fmv763u0j0 /aylqfavr at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the po,.qa61xkb5*c cfpgprimary coil kpb6 p .5cog*1,q xafcthen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seconao1k *8hbl :badary coilloaahb:k81*b 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, the power in0k9;yn5)gq qt0xhb dq put

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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 ciy q kf45-.gyu-j2 pqa*w;xnav rcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of q)txax6 v 2h/u- iv f1lv,/ldeconstant terminal voltage. At the moment contact is made with the bat1v6u2-ixvh qx,t//l)f adevl tery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an iddn gzb4b kyk9;qow 8:mzx0d ,6eal battery of constant terminal voltage. At the moment con,xk: 4dm;oywn968zkq0 bzgdbtact 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 gcf(yi -;r8 jw6mxxc ab-t- (aL and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista3 hb 9oi +2vw0sbi*hpfnce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time constkpb,3*f 0o /ywzc7czi 5 7mn9tbr4n vex7gb+eant for 3btzc/e4*07f9ey nvc 7op+ bin gkwbm7,5xr z 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 ino 9zupojiuq7qmrn;z ;4zm,3kl 0.no4 v8c2hb series to a battery. The battery is suddenly removed from the circuit. The time constant for ofn8q p z u;m24c0ozqjmo.r, 7ob;iunlk h93v 4z 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 exz mie5n fo5 ina/iiv47+olz*/ cept:

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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.2ibm/um h v6)e 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 an2xvj8zocgd)s p gk ),) AC power supply. In this circuit, the currentd8gvo)sx) k,)2cp zgj

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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 changedhkt)*lagxk tcm2) .vv h/l-3s by what factor when the frequency is tri)g3)tkv -klhxh .t/c vdm2 a*lpled?

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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 inductor is doubledtvozpdk5m0 ;z0:xvmxiga5/* , the inductive reactance of tv0i:mk5pm *0xa; /ztdx v5 zgohat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indh67 - 94li:x hqoxg dtup5+ykluctive reactanc +:xui9ht-opgyl5d hql74xk6 e 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 connef( aus+6juc/ in5i (opcted to an AC power supply. In this circuit, the currentfsaju/i(+o n cp5(u6i

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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 circu5odc7 ,femfp j)ns,o.m fl v+8it changes by what factor when the frequencocsnem5 f j)l . 7dm,fpvf+8,oy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a camm.0* hh gkpx.pacitor approaches zero, the capacitive reactance of that cxmpm0kg. h. *hapacitor

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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 voltage6 jcdd7k hj7l2s of the inductor and capacitor in a R7 dd7jh6k l2jcLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is d17zm)cq ./khco( g 1csin +mwkefined 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. Thexm , 4zmph2nv918 epby impedance of the circuit increases if R increases. When is this statemenb 89px, 2n m1zmehpyv4t true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit i2. 3ary,zbbr:m sr3znuj h/w ebi;t7)ncreases 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 impedanjq8ft.,h)mgr r)bi2c ce 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 capacitance both double in an p ipd5w aww w+3.xqe9.LRC series circuit, the resonant frequency of that circuit .9w3 xp+ a.pe5wiwqdw 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 circui6zg xa2cr vij(e 9vj83t that 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 circk0do580i5k:aahaa9 e qvuc3e uit 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 rotatingjwt 44)twjr)g in a uniform magnetic field of 0.20 T. Find the magnetig jw)jtrwt44)c flux through 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 radius 0.10 m is rotating in a uniformncfil*6lmk3 pxa c36: magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the*l xnpacm3lk 3f:c66 i 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 unifb(aw9t+r8jn,i bar. mkg k c0+orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an amkg8k.ata ,++bc9n(bir r j0 wngle 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 loo8qanc (;lw2 sbp 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 chan0cr2knkko e .0ges 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 t(i ,kxkh3gw:h 5 s1tl18 cm. A 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 t51gi:(lh t xkk3 hs,waverage 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 and an area o n/-chme*tc r**2+k (ad h2ry s7ftjm in./njrf $0.40 \; m^{2}$ 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 a2(ax 3 no(mso43lg*wf+fy ;uos.:wq dudecq :nd 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 6y9ryt224;rt gl4 c +hbb+tpve0 m flies horizontally at a location where the downward compone+c r+y y9l;rbb 4ttv4p 2th2gent 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 bac4*i tgpt c10u vt9acnwu29 3ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m 4a *tt9gn1cwca2i0c3vupt u9agnetic 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 zo adsbf76*p6/ , b dlkz+;msza 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 consistdcf 8*1axctfmz; *,5im,gx yms 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 its armature. Each loop is 12 cb/: ,r j*y:dh ;ub1ikqq: tx;d,xb6gpobaz 9ym 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 bb:y9,rxhd ,od b xz:1jib6a/guky:q;* pqt;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 areagjsie*v9:h1rupd t:8q.v 5 fm $0.090 \; m^{2}$ 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 55dr sg+-cbu 7b: xzhztm:5ghyp-2f sgenerator with an output of 12 V maximum when rotated at 60 Hz. y5-zh:c:5ghdz 5bprmbs x +-gtfs7 u2A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gen cqh,+.sbfvkzs 77xy1erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor2vmq2h ( gsck4 zgf-f: 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 operahi9,ul xbaivdcc - 6 k)( o)x*90fhg0eiv n4ydtes on 120 V AC, and when runn iicx*efv4 6)vch0obix y) u-dga9,h l0kdn9(ing 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 ir)a*ci3vjgv7gnda h :+ t-ly ;s connected to a 24-V power supply. The operating curnl:-)ygv *vric h+ajad7g ;3t rent 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 interna09to5mp:c.g y b rzpz+l resistance 6.0 W is connected to a 24-V power supply. The operating curren59t 0mob:cpy przg z+.t is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thp 0n):uba5dw*s/r wz4o zq o2te operating current is 1.0 A at full speedqo) 5bwo0 zsrtnpzu*:/4adw2 . 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 tol 5x uu ad5ls4,p( 77gml4zjld 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 tra-zifomyh8 w/ld8i 8n:nsformer causes 14 A to flow in the secondary. How many turns ar ohi/d ln-8 f8ymiwz:8e in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary ingtpilg/c59 f-m 1tg eg r0q*5g a 110-V primary if the 24-V secondary has 100 tug/qptg-rt5ge*0 fi5 c9 g1glm rns?

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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-turnxtyr-+uh cs.8 primary coil and a 2000-turn secondary coil. If the current in the secondars.yxht 8+-uc ry 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 bxza58s:aunv*p . +vz9ab.lmin the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow ip.l .x 9 a:bnvv mbasuz5za*8+n 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 ak h*fwbo5v,v /wu 9ug+ neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drhw/ g*v+bu, 9ukwfvo5 aw?

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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 t+ g26gsg /2b ynx*neyuurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tosy g6*+g2 2ybngxen/u the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnszop-g uq:njr g2z-i76 on its secondary coil. If 120 V at 2.0 A is applied to the przq 2pr-6zjo in7:ggu -imary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If g2wki,kyy7r3e(hj- 5kdoeu . the input current at the primary is 100 A, we can expect the output c2hr7 jwy gke.ku3y5 k-oi, d(eurrent 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 hyp (:rj7y3zyo as 100 turns and its secondary has 200 turns. If the input voltage to the pr3(rzyy7po yj: imary 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 trans0m 4aks5jwz1ahx 9gj6 former has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lossmx az9gjh4 610s akw5jes)

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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 at1l:wriqq93 (al), zlmwn36obkspu 7zxn w 96 v 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 2l lb7 s3poi9u:qvaxz nz n,6wkq3 (6r91lmww)00 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 12ozz(xb y *v7oa 31(t /6u+d8u udjerhz0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a poweudxzz(1o+78j6ev tdoy/u*z hra b(3u r 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 usu,5bev u)u;itv26 swsj ally stepped up to 4500 V by a transf;v,uwbu5ess t)6i 2jv ormer and transmitted 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 5p:4;a0vbm5d -/3l 29ad hig )eb)zqql njjnj p0 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. Whan3 e2pd dbajvjliz q- )an5ljh0 ;4)m/q:gp 9bt 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 kmjl 9 .7ipod(ct 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 lj7odtp.c 9(ia transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 10002p:b+e nq0(n:z nhvlp3ues 3j V. How much less power would be lost if the pu lnqsb e:npvnezj2 0 (3hp:+3ower 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. +x(n1 b/ex ttsIt is to be transmitted on a line with resistance of +/btxse 1x(tn0.60 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 is stored ih.m4ku7 xc f0mn the coil'sm0xcm kh4u7 f. magnetic 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 rels)pwn- /vr s.sistor and an 18-H inductor. What is this circuit's time cons.wr sp /-nlvs)tant?

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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 e+ ry,dzs 4yw-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 in aw7psqjyq 9ww /p4;s0to a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet ucinnyqn*m; v0nrr r/248x,t. What is the resistance of the lampq8x/* yr tvnnnc02i ;rrn4mu, ?

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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. ky ; ,l.dmt8vfgh 2e2mWhat is the peak current through th.yvf8 et2l2khmd;,mge 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 izsb:2dq: lbl 124+unghi l a+power dissipated in the i :sun:l2dq+ iahlz4l12bb g +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 is 4tdf avd 1+ru;vsohp*8 y+xh ,$I = 0.80 \sin (240 t)$. 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 resi,;ivwi2z-br(e x 8 pjastor 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 resist hj48k9g*qb6 ) gu2hnitgqss3or 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?aprg 1-.rls0n )t q h(t)-rnrp

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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 rea,hv ,nu+b rsav8p-ay +ctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil 8p.:0ec bwi,xbhi puh:bh8 tef:5oa ,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 fo (o( iv uzr;em5jxp6*y i9 hwrktb0;6er 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 yo. ,5mmkqc ux 554cazat a frequency of 20 kHz is applied to it, cqa okm4mzxyu5.55c?

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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, 60.0 Hz sourc p uux:pita+n)rp*0oq;9(vqye?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10qia;a fe(jbs6 f)l c4lgee4:1 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 10 kHd80zr uf*7mki z?

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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 of 1200 )ewnu-j1 o4/jcorj ;iW?

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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 0.0 (2h e:o56rissck cct1he2oq010-mF capacitor be 100 Wtcskhh 1 ( ee or02coq:s562ci?

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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 capadipzlv 9cn7lsk 3 a:)8jkz0. dcitor 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 circuit with 12.0 ul/z4dht0 s)yW resistance, 15.0 W inductive reactance, and 10.0 W capacitive rea t4 uz0)ls/yhdctance?

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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 eiolif 6)l2ek t.h u:1resistor, 20-mH coil, and 1.0-mF li:ult ko)iehf.e26 1capacitor 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-W81b*s-efmom ztt) zih z.d7x ;iod3,h resistor, 20-mH coil, and 1.0-mF capacitor are connected in se,*x d8zemd h1.szh)tifb i;oo3t7z -mries?

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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 iranuc 2 n+4w7nnductor, what is the impedance a4raucnw+ n 27nt 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in se ypjgl-31 9lw,wl n;dzries with a 20-mH inductor, what is the phase angle at 1000 Hz1nl z-l 9dp3wwly j;g,?

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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 serieqz2 op f5,,a8luhh2t xs circuit with a 20-mH coil and 1.0-mF capacitor for ap,lhz 28ot h,q2f5au x total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor an1 e:p/yn4cpred 15-mH coil to get a total impedance of 110 W at e r1yp4/p: cne2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a tos34zqbezn gjdd y+.v4d 5tq+ ;tal impz43g yvqnedd 5z s+bqd;jt+4 .edance 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:seyai 9zzl.c )8dn e; 100-kW resistor at 1.0-MHz for a to). 9z;ds8yzcn aeeil: tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What c y4f4gufa* 7iis the impedance at 1000 Hz?yf47gfa*c iu 4

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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 capaq0g5g56xa rz s-aym*.pov4kk citor at 1.0 kHz for a total impedance of 4o4- sa.6xm kzgpyk* 5rqv50ag5 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 kd90w,+ fdpi 7ae2 gddqHz for a phase angl79 20qddwe dad fi,+pge 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 7goe2vayi q( +with a 30-W resistor at 1.0 kHz for a total impedance of7q(eio+ ag v2y 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 ,e 9,e1l8sy9y ee7mla d+zfi pwith a 100-mF capacitor at 120 Hz. What is the phase an,a7ldy p1ee 9fl 8e m,si+zey9gle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at0 byt7v cmj(z/zt6bu+ 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capvb cz zubt6jm/ 7yt0+(acitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and bf q*d1nnz7*j a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppl z*nj7*bnqfd1y. 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 reactancjtx.qx(,6iiex u ;+ pxe 30 W, 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 circu.pqu,x t6+e;xxijx (i it?

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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-q ol bj2-*b5(ilj obx2W resistor, a 10-mF capacitor, and a b-52ob *b ojlx q(jl2i0.45-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 necesz41 blc7d 0q7p0baml csary in series with a 500-W resistor for a phase angle of ml dl477 0acpq c1bz0b$40^{\circ}$ 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 = qpcorpe:7ne0o,je/ 0gi0 ,kx200-mH, C = 10.0 mF. At what frequency should the circuje0o/7xik ,ng:, ec0r p0eop qit 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 resistance, 15.0 W6o1fziass 0.kku bg:3 inductive reacta3k1og: 6.bsziuks0a f nce, 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 ajys8glcs65;g -nn9 tsra zz 4-n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. ntvr5+n1.cj kyh2z5 fWhat is the power fact5n+5rfjnk zh vt.12yc or?

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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 factor5z7q msa c3ea9 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected 53zce9a7sma qto a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in ser( dtn 5ijiqi.b( k9ko+ies?tq.9b5+ kojik nd(i (i

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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.. yxn5v- duo+sc5*auog z b)h 4.7-mF capacitor for a resonant frequency of 10 +xv d*hcz uug5ao y-s 5ob.n.)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 freq l 0ubyr0,pn m:qe+v)huency of 100lpmnevh 0 q+0br ,:y)u0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series withdfry bliqpk3xm 7/. )0 a 30-W resistor and a 40-mH coil if thp dy3xbimr . /qf70)kle resonant frequency of the circuit is to be 1000 Hz?

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