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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 arce(bf0t2)ix0s,c o y t-+bzhorbe6m(e units 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 states that+tyw o w unww/)p/i;q/ 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(q.,l 4+15qaqk cqg+u xooyaa loops of wire in a coil produces what kind of change on the ,1qgx4 5cyolqoa+ k+(qaqu a .induced $emf$, 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 t 68t:hv 8cb rn1es oq)nzm,z1the magnetic field through a loop of wire produces what kind of chaont v e 1hz8:zn6mq,)r s8cbt1nge 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 svg,,:d iu b0swhat kind of change on the inducedvd , :is0b,sug $emf$, 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 froag)uky7k;p 5xcl;s3b 0 hnu.s m a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a;id4fph;t b nt:y(j-f conductor will be that which tends to produce which of the followinf4p;;dyb:tf- ij (h tng 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 magnet is heldgw04ti uu+ um3 above its center with its north pole point0 itu43g umwu+ing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abo )ih4tb;af2 qms/. ndyve its center with its north pole pointing down, and released. As it amfq;2).dya ib st4hn /pproaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the gj)o 0b8zfy jn /+b0 f,)ju l0hg+upwamagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of theh+0 ,u8goyfu)+a)lbjb/p n w fzj00gj 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 wh;dbnq g.lgm r0.i(/ao ere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of gi do/.mgqrl;a(.nb0 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 regi v/q8k0wiqx ;b*x ls8nwi- b)jon where the magnetic field points straight down. The magnetic field disappears sud8/n ;is*xj k 0l)vqb8xi wqwb-denly. 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 hox7 yt62ht c*frjng4(mrizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the m67 jg4nfcrthy(2tx *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 of9e 7xbp+r5f ov wire with the north pole entering first. As the north pole enters the wire, the indupobr9 e7fx 5v+ced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about in1p3 bq6 axuwt6wy(3an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotatio6 y6 ti3w(quxa3wnb p1n 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 /7wmfgfd l4ovjk.r3 9y+9m letax/5tie- 9xh is rotated at constant angular speed about an axis whose direction can be vvydx.gf9t93k9r5+ mho-7 tl//wla4 efxmiejaried. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.r oyqw -hkc;8 )i*zok.
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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 th y4s k:n*g7,(szpd,f vd vselz5o/oi ;at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetakf+q(by b0)y;s yd5h ic 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 th+7pgpvi0q lc.2j z3cg *qj 8tne east-west direction) is moved northward at constant velocity through a magnetic field that points straighp+n0ljgzg.jq pi27c3*c v tq8 t 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 rotrtrnija2puovfx9gcuz ha1b: 8k .x2,* i52.w ates 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 azpz m,m 2pgsdl64 7:-peh5ad transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotakw gs t+scykk3 qxwba4-6(3j)tes through 60 revolutions each second. The frequency of the3+y-(t kkska4)j wq6 sgw b3xc $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tom5 h*0p.thrr v

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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 i-egkt;y08s, eq f ;atrt4c0t 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 sehp jeuss3 21lwgx2,n5lr n9x5condary coil contains more loops than the primary coisenx,5 j 2wprl5h1l23s 9 xgunl then 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 looptyi /fc8,zq up9 8dnxti g:.)ps than the secondary coil then itgp 9nutycti) ,di/z8:fpqx8 . 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 *q tnjcr2nk+ 3input

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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 0gm t3ktru2h oj.x 0e2circuit,

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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 qz1 yd:.5o.aob ut/ddideal battery of constant terminal voltage. A.1 oyq.udbd:/ adt 5zot the moment 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 inductor are connected in series to an ideal battery of constaeml0+hrxp* lp-a 0 -o;z8aec jnt terminal voltage. At the moment contact is a-hrxm0 aoeep-;jcll *8z0+p 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 d +gc5k:p8rvc1 )eji6 -dzh jqis connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to a ctje/g.+ yj0tjb*f -cn $emf$. 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 inductok)6 4d1aebf b(ta kglp: (gdr;r are connected in series to a battery. The time constant for the circuit represents the time required for the cplgak kt ) fd46:(adb(r 1;begurrent 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 series3t zkp2vj/uk*axq p1w9cf/k: to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decp9v:cfk*jw p 1 a3/k/uqkxtz2 rease 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 unzefhzh3 3xli p3 c8xm,,fx- 2sod+ug,its 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 psh)y6krs/+k*i s j uyxa+fh;,ower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cirgf/3 5yzagl4.. f ao0pebzg81 sgpia(cuit, the currentz.li15p 4as(y.ag8gbpo0/eaf g f 3z g

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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 circy+wnq mg( ;zav.xv74 cuit changes by what factor when the frequencnw 4 qv+m.ga7y; vxz(cy is 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 8:z0nwq9zxv3 7yrdjbacross an inductor is doubled, the inductive reactance of thatz8q:br d09xjy3 w zv7n 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 kffo/5 2ww 1(mu qanurs)rau.4tvq*+ zero, the inductive reactance of thav 5uf+rwt mo4 *qfku(ur/w n1aq)2sa.t 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 mhr65i h;nnq;dhc7 ail/vy): this circuit, the currentha l5id;h;i/7nq n 6yv)m:hcr

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what (+25m3 g2q;wxynb5yzvrvn nkfactor when the frequency ix (m5+y2 nk;vzq nwr2n3vygb5s 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 vohux/ ; y0zaf1akl8x *tltage across a capacitor approaches zero, the capacitive reactance of that ca0*xfy1xa;zl 8ah t/kupacitor

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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 betweenzah5vaf)ey i:.4 4 2wc-emjrg the voltages of the inductor and capacitor in a RLC series circuirjvc.h4 :- mg2wz5 ayae4)e fit?

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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 my/ xb.p lk rlexgdw9)gd45(ien, 6-xcircuit 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 circuitni0j 86s; zl4fkw7 rgm increases if R increases. When 467s;rjg zl mnki0f8wis this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impeda54hh 3r5ozm:lktm 0wwnce of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuitl-zow8. k+l eau8/ tl(fjkls 52,fw el 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 det/ti/i xh+/rl(elf:ouble in an LRC series circuit, the resonant frequency of(h+r/le/: txie /ilt f that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vol(u oi+lm/d0;g ceha/ mtage. 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,fo2g.j 8;(zqhia v s61zrobu RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneti+hfkt*p17 wx zus hcjn56h :t9mp)h a-c field of 0.20 T. Find the magnetic flux through the lz hthmta-+u5 f6p1kcsw9j xn:7)p h*h oop 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 rotatinmjg3/5*+lmi (te qg q eb(*skkg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and qk tq igb3me/+gj(s (el*k5m *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 iv0/0tb dvr*hy9nyryy 9z +d)pr+s. yfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto9v) yhy9 r pys*+y0drvd0yin/+rtb. z r are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is red qp3h,w 4xld/puced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes f,vj b04*l4xui5 h jfn3 co7qvlrom $4.0 \times 10^{-5} \; Wb$ 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 frameyg vl+m+ x1mvo+ g3kn( with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field 1gmk+y( lv3x+g vm+onchanges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire .uusg6rsw6/5vm4sj nwith 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 a)bs1gf n ;m0sfb3;hhund 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 .1j5d..fdg p*.vfte0skonzu location where the downward component of the Earth's magdek.. n u.g fots5vpf1 dz.*0jnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocityb5vkc3rca i v(3cch(5 of 2.0 rad/s about a vertical axis through one of its ends while in a constant makh53vbc 5(vi3cca(rc gnetic 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 cros(mod;5 jrdk. *qbqj f)s-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofvtlntz y/ o3hr1-b -1b 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 rectangu5t5 xbjl9p :ha.slf3r 3ksze:lar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates att:r seb.3xk5h sl:p 9fz3al5j 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area y( ml ywnw.k5b-qwk :b* vr;b/$0.090 \; m^{2}$ 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 outputs p1u;zzljdc;x.)w j- of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avail-s1 cjd; x u)wlp.;jzzable. 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 maxx4qo- qze9kp s.uq;p1 imum $emf$ 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 mop) :yq1 bs)o.wb(a md;yo9 4plk(fdy rtor have 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 resistance of 6.00 W. The motoru42pst5te 2vk operates on 120 V AC, and when running at full speed it generatev 2ut2 tesk54ps 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 1e oe(ct 1/g, gk1brobresistance 6.0 W is connected to a 24-V power supply. The operating current is rkco1g o(g, /bte11b e1.0 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 supplyxm20 s vj+( q6hg3(xg mh0gprp. The operating current is 1.0 A at full speed. What is the xs(p3qm (x g6gm hp0hv g0j2+rback $emf$ 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 connecg pyqob;abpnp/:da foaw, lw)4w7. ;2ted to a 24-V power supply. The operating current is 1.0 A at full speed. What /na.4p; pbo)a l p2dwayb7,;f w:qgow is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltageoh t mx),cct b vtz t,dn901-uta513vx 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 tozk+) ,sa(fgd g flow in the secondary. How many turns are in the seco ,z(+kf)g asgdndary?

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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 turnsav j1mll ix .4ids)-gep,/d:v)ww/kv are necessary in a 110-V primary if the 24-V secondary has 100 t )/iwgk4)sjd/ x -ld.ivam v:,plwev1 urns?

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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 prima wsidj6+yqc a8osvsx6 y,(/ 8iry coil and a 2000-turn secondary coil66+y ,wis/jv8 yx d(qoci 8ass. If the current in the secondary 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 the primary of a transformer. ad3snl jgvx* uu;ww )m7j 4(k* Assuming 100% efficiency, how many amps at 24 V can flow in tl;3ujuwda gsw( )kxn7m*j 4*v he 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 providpi 8iu eppp,6 ve/+ kpl+q 7vev3y6e:bes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prima6:pu,eelb/pipe6vp + v8p+iqek7vy3 ry 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 tur hak;6 sux;aa.ns on its secondaxhas;6 ;ua.ka ry coil. If 120 V at 2.0 A is applied to 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 hxf3v j62kna)pq 1v+ds as 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V )f1d +kqjvx a6v3sn2pat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itm ump 3-g-8wzr7 d-bhds secondary has 200 turns. If th-7brd dw hum -3pz-mg8e input current 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 turns and its secondary has pm,f kn9l:* n7o hh30mcv o2xz200 turns. If the input vo nfm2hpo :nlk 07v 39cm,z*xohltage to the primary 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 turnss;ila )p3ubi *)rf(yrpt.6ra 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 ()r(rty;r.3 ufb sil a6p) a*ipneglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualvr1p d2z,.wtffe l1 k0ly 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 primar d0l,1vrefpf w tk1z2.y 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 voltage islldci/h/ how,rj/. n5 +hh w+ama/t3l usually stepped up to 4500 V by a transformer and transmitted thjnhd.wlr,tamc+5 3l +/ha / li /o/hwhrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltaj6fhofe;h l6*b axa yijp7il:40i t4 8ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltagh *tifaip:h6x; a0b8lie4jy 6flo74 je 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 ha eod;.eveg4a ax8+bo1s a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss d vedgaa;b4+eo1x oe.8ue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 tp6g6mj8nx ;uuk7vy1 a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss d71;6tv6g m 8ypxnuukjue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W lin) d3; ic3(:h awvgm.; xvwekgze at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of3zwag;)mgw(cd.3xivh v ;ke: 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 1d4pfedy nuh8w. -1psis to be transmitted on a line with resistance of 0.60 W. To what voltage mus1.ewp s1fudhy-4dnp 8t 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. Ho(k(5pnur5 bl vuss9a:w much energy is stored in the coil's magnetic fiel55snupvb (ua:9s(lr kd?

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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 containfh*xy.1*nf p1b,pot n s a 6.0-W resistor and an 18-H inductor. What is this circuit's ti n1po.1*x t,fbh ynpf*me 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,mtww 00 s6s-uobqmr (a2(ej r 1gue*t 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 outlet. What is thp 7chrts)5 .aze 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 outln2od 7h8-3ud fijj m+fet. What is the resistance of the lamdojfd7 h2fn + 83-mjuip?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cu: ve4*3m +w bnzmab2aorrent through thwam :+*zm b4n2ova3eb e 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 po c+d/z avg7jww:p q04awer supply. What is the power dissipated in the res/wgap v jcadq4+:w0 7zistor?

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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 resist zu k1v3q 7k-soza+u,b-xfn6 lor 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 resisxtf 77+3dnp (0xgvjeh tor 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 resisto ;:r vqyrg 2;(ybkqx0z8.rhdhr 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 ofm(acxo5g0 q0v a 1.0-mH inductor at 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.t, 5(. y3:kcyc+viffzku4 zxi50-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 have 14.0 W of inductivee -sqj/0f oakwy19l+r 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 15etl26 bq 5 q))ogo1 ui e9kw:lnkgh2j57 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 frequen*v(o sx+ 6fz4kfe7ng k.ks:kzcy of 20 kHz is *kszgo fek.:+fz4nsk67( xv kapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so-) qwzn zzqg84fdo8( kurce?

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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 reac)aw szcpy( a8- c)8ugutance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive react7d1n yhc nfl6;ance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor l*-aco2rwj2 f, abu d2g4mm7ehave 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 ;k8yqqikz+ hp,n*r ;per:n6pu 1 bvix 0 cg)l0capacitive reactance of a 0.010-mF capacitor be 100 W?cn;; rrnhp+0zkybi,1gv8*p 6x) p 0qk il:e qu

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz h 1.wk 3-ojczkcblon)y6q nl)v+6(gjand 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 /i +bvig6v( dtW resistance, 15.0 W inductive reactance, and 10.0 W capacit ii t6/dgv+(vbive 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 immb9 v5kio l)vt :kx/va 2pet.9pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sei9e2:5okl / vpv)a.9xbkvmttries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistvz+k: ) qi)ym1bxo:k kor, 20-mH coil, and 1.0-mF capacitor arev+)kozk ) x :1qimbyk: 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, what is theyf eoc;a7ftd4u2 ece/+qh8,f37esg m impedoe 7/73ae2+ec efsqd gm, uth4c8; fyfance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connectqyh3 pz)-wwahbt:nsiay.s3 v,8v- t,ed in series with a 20-mH inductor, what is the phase angle at 1000,3h. a-sww3v8ya niv,st hbpt)z - y:q Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil t8eu9gxxz*pyddc2mw s,a9p.; /rj0 o and 1.0-mF capacitor for a total impedanc jo/xcdrst ;de 9y2mzu*9, wg.ap8px0e 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 capac)t:ae;nd/v;n-: gm fahtr. xpitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedanc-a :hpvt:ndnx ;e.fr ;t)/ga me of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a tocv,-s(l zc/bq tal impedance o,b(vzl sq /-ccf 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 for a4 *ws9j 6lvm(yps; m3d;x6tba;ph1cpnj5 wlc total im*mcjd 5cys9w36p m4 s1 aphbljv; xw6l;;p (ntpedance 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 cq2vy:i aa/,z-q t8oxgapacitor. What is the impedance at 1 -2o,: yzi/gva8xqatq000 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 it y(tj (nhe nrm(g+m +8i*kdl:yj49u kHz for a total impedance of 4 ktt+ery (ng 984ji+ylum( m*:hdn(ji5 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 capac-a m cf*b::efwitor at 1.0 kHz for a phase a :ff:e-m*cbwangle 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 witfwl m*5 jdou9c.c hd6:h a 30-W resistor at 1.0 kHz for a total ifuddl 9cj:6c*.w5o h mmpedance 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 10 /7.dfz+lo4 lniz7i orhe9z8m0-mF capacitor at 120 Hz. What is the phaimd+flz8.ni97or4eh 7z/ zol se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500nb2/:egftzb:z .u 9ax Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa2fb.:nax /etb:9z uzgcitor 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 :2ato :1; mq dmj2pxapconsists of a 100-W resistor, 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 currentxp2dao2q;1::tjpm am 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 3hlgg/me6 3,nr 0 W, and an inductor of inductive reactance 30 W are conn3 e/rl 6ghg,mnected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for aus(0) cw o41of7 fyvjd series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po d oys)o(cwj7 u41v0ffwer supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with 6jis u8g +tsh:6dcyx6a 500-W resistor for a phase angle ofs6xh 6cu t 8jis:+6ydg $40^{\circ}$ 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, j0,ne-*p.a fw4eiujtt+x. t : wlyia2 L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred friea-j. 0aue+xi.:24*t nt jp ytwfl,w om 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 resistancedm27g;o6zsdg , 15.0 W inductive reactance, and6sd7gmz2;dog 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 ad qk,lszh g48-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 impedm.vbph,1j84zp7dm m zance of 60 W and a resistance of 30 W. What is the power factor?jp7z4 zd h.mm8m p,vb1

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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 conta7quzq69 1v dkjd.lr hfz5s0wb9vvg/9 ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,gd z96d1u/lkzshvw r09q fv b59v.7qj 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 frequency of a 1.0-mF capacitor and a 15-mH coil in ser9 mh0ihvy5(.d-d okrz0 od)t iies?0 (i) z yo.m5do0hk-dr9idv th

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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 1 tanh3v+51b21 8qrpq tfy lrswith a 4.7-mF capacitor for a resonant frequency of 10 kHz?vnh 15 a r1ftqy8 b2lt1rp3+qs

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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--llnxd* m/h) ,ssv4irca ;9 *utre l6emH inductor for a resonant frequenlm ;*tvriux,s*ll a)r6 esd4 h e/c9-ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and h zix1ngvoan;3tf, (. a 40-mH coil if the rev,zntn3xih;1o(f .ga sonant frequency of the circuit is to be 1000 Hz?

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