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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 arxp+b zqt..n e9e 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 stat. s g4q.bdo:rbes 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 loops of wire in a coil produces s nyxvzjqh1-wg1:6 j8what kind of change on the z68ny gq sjwh1vjx :1-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 the magnetic field through a loop of wire prob +wb8lmv o7+yduces what kind of change on t7+yv+wolb b8m he 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 producesk31ho,lgid/ un* gwtfdu9: 2 x what kind of change on the induc:ddo w ufx92 /u*lkg1g,inh3ted $emf$, 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 fromdx ,jlx vkk6ck-ldg 59v9a6/ * 7sxhnx 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, h-zphhzo80igff; f 3/ the direction of an induced current in a conductor will be that which tends to produce fizhfz3- p 0hoghf8;/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 fla q;;w9h( /t;k08fvvj7whbfmbz( ip3k xim a:x t on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magn9ibfzx i;pfqakhtm;bvj(m8:(;hv / k7w 0 x3 wet 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 h*qs:e 9z9s avz6qf1dgxwv w- 4orizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it apzw1qsq9 xvs*6w4 :def -z9v gaproaches 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 wher-czh)z1xvp +w1 vku,ie the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from ,cz1vv i- z1)phw+kxu above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region we34ko zr* h/4 /zlbizphere 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 azziez l/4o/bkp h4*r3 s 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 in8f rww u2(/6 h7ueygtj a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the 2hwg 7u8(/weyf rt u6jinduced 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 horizontal5n61podnbrf3 47gi;d 6v wvmfmc 0j5 o table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either sinv;f3oj0m 5w6dr1 i6pdcgm fo745nvbde 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 enterin41.2px cv;9xopqnbi n g first. As the north polbopqx1. 2xc49;pn nive 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 c0fop;v0po d 49;ycf o,evn( yklwaef75 ,-qgdonstant angular speed about an axis whose direction can be var op, focl4(vfy70kf-;gvyn0w apq ,e;95eddoied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatspu d:/h .vuv9ed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotatu.s dv9: pv/huion 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.3kmy s-n;buzb aktus.2k q8cu7h(+l0
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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 t ebd *gk5o-g9cukm02 90x xocdhat 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 ly+on)w nrd uszm;q +l7(f4n9a magnetic 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 eastb2 xq3swx4.el-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the po2sl4exb x.wq3tential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vec zm0(pdf3f;ulocity $\omega$ 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 tx)e 6 ibb1,z9p5 i fzc95kqe q4ofpiq7ransforms

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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. T,km9lf 9nj+zq:0 n qqnrwi*0x he frequency of the qqnjrl0 w,k9+ z 9q:n*xfnmi0$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devi 5+u)ihxis/ *iiu h27z+xnfkdc8yy- oce 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 dseo5(oz dtsr9::kp t; evice 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 secon a-+rr*d4ssftd pjc3va+n/-b8 8ou pfdary coil contains more loops than the primary coil then it d+pn o34t up8r f- *f8rdv+sb s/c-aajis 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 primars qbp2m/.0vdtnhg 5q mi p5)m2y coil contains more loops than the secondary coil tm5 5 / 2dvgqtqhbp.s)mnm i0p2hen 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, th,.8 4 acieovqke 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 oo yz,jxd3o+r2 7e in/circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ouvm4z l nu(+:1 3 t mbgbw(8zwiwugo--f constant terminal voltage. At the moment -wm4 ov( t3inubg:(gmwzbw1 uu8+lz-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 b x08(o-aue.kxbt pm 8ideal battery of constant terminal voltage. At the moment contac u.m xabpb0ok-88e( xtt 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 indu1nowd. )kyr ,kctance L 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 wi y(uh:wd+*i*si 3e yjz.1am vnth inductance L 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 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. qnox zca6w,q9acviik: ,*d+7 rmk( t;(q ;vfwThe time constant for the ck* +,fv akqtqro6dzvmwq( a(; ccni,7x;iw9: ircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series txa .;m1rwj*rch ti2w:o a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time require*ar:1 .th icrm;wxw2j d 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 unitsk) pw-a f8(tik 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. On this circuit, t mzd:bd osb+x8a0/ n.b1tyu7d he 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 AC3tm ds5:ewccm 4t 9r;*(llva/yhar s1 power supply. In this circuit, the currencs m wa45a1y v/smtrdl;l3r(*t e9hc:t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit chang245:q lm0m1dp+t c , gqlxibzhes by what factor when the frequency is tr d0gmq,b4p:5 c2 lzqm1+lxhitipled?

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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 vqva;q;/(j k-s xy51 xjj:obw2i mrg( yi4z6lnoltage across an inductor is doubled, the inductive reactance of that induc(iw /i:j ky;1mj- s j2q5v6xyra lq;bgnz x(4otor

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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 app 3rh m,tr/;iszmmb k1;roaches zero, the inductivem/ r,s i3thkz ;b;m1mr reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected u *qqr2f .voe3jxld 3;to an AC power supply. In this circuit, the currentv*2;3oqqudj3 e l xrf.

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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 factor :h egy53 ht,f ekhcr21when the frequency is triple:f5ke h,h c2e yt3g1rhd?

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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 capacq.38mu (/ c*who kesr u srdb:v, 7q2(7jkugkgitor approaches zero, the capacitive reactanc m2:(k*kh(s8ure,73qk/gb g7voduj w.suqr ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacito7hy, w rzpm4h/r in a RLC yh / w47zp,hrmseries 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 c5mxwrw 4-a3-5spxrn RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of th lbw7dpu91( o*4.sw *y xlzrxse circuit increases if R increases. When is this statement truwls(z4y*x.xub* 1ldos 9 rp w7e?

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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 th ;z4w;uh7zbq xe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases r t(s*m k8rxb;si 9ucse7dj1)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 doubckxeputgb 29xrj)1 ;z.xdg;)le in an LRC series circuit, the resonant frequen1p;d) )c xu9e2 rzt jbgxkgx.;cy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an Ap x7v0so)*2i no -gdzv1hg;oq C 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 epz) v y,vtkfww2 zx h3c9pl24gy z)4;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 radiusm1qt5 lu. ncd/ 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar nc. qd1mu5/lte 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 uniform magnetic field ooama4m bn:v)41fw .qv f 0.20 T. Find the magnetic flux through tmvb.v ma41)o 4a:qfw nhe 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 field of 0kmd v3uq(n1gy v( 8jav4+63ca uod;qb.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at 1v avk4 aj ((d3cg6dq b oum8u3vq;n+yan 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 are-a9d zq krrnjqhyq *-l-. c4w*a of an 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 coil changes f:m xc* d+t8rz* 0ncosylp5*ubrom $4.0 \times 10^{-5} \; Wb$ 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 l8i*9r lq8swt jw+ny0*)n2b+iaie zw a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the planetyrinjnwlqws* a9)z elbw8082++* ii of the coil. If the field changes 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 with 15 turns and z4p).ns0bn ji 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 a8*j on xghx:r58 b5rdnrea $0.20 \; m^{2}$ 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 horizontarxng o:b;6mw ,lly at a location where the downward component of the Earth'srwg6xm,o ; bn: 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 lkk exq8;kz /29di*umvm 3l3 lmong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of itmml8;dl 93 iqmek*u 3 kv2kx/zs 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 ,gdu 7k ,qa(dahas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu nyutdlbr(qgm2s ,j 3-b p3e2mg) (cw1rns 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 *a8 qe*qx(syi its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltxi8* s *q(eqayage 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 o1otri-g tn w6 ofj*v47gj5t39pww 3 rlf 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 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 outp6 q(g96rzfy t nnlo0.m)itx:xv h,tsl;7xv2 dut of 12 V maximum when rotated at vy rv oht6dxt;0z()snfit679mxlqgnxl ,. :260 Hz. A 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 generator with ut6m*).kt hsla 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 ha s p)g8e0n;irx(bfy z2ve 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. Tzbadv4bx 5n/2zrq v3buxp0 ,1he motor operates on 120 V AC, and when running at full speed it generates a back2qb3za zurb4xxd b,nv0 /vp51 $emf$ 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 6.0lp78ko sya)q, W is connected to a 24-V power supply. The operating current is 1.0 A. Whakly,p o)s78qat 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 2p z4:tr: 7pi m/b*pugraah+k- 4-V power supply. The operating current is 1.0 A atg 7k +ru-thpza mribp:p4/* a: 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 /;2+3jqiv 5yf kuqqg *m;tp g3to-ldd resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whtf; qjmkg+y3i5 ;g u*t2pq/o 3ddv-qlat 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 voltage oivqa zk9 a/89bf $120 \; V$ 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 caus8fes f.a: k*oxes 14 A to flow in the secondary. 8fe:k oa xs*.fHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-cvvwft0s bp 7t0m n6*cu35bmy 1 .6gzcV primary if the 24-V secondary has 1cb ty.w0 vnv3t6c7cf1m5m6b s*u 0 gpz00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn sbtxrhs 4f f91-econdary coil. If the cst19-r xf4 bfhurrent 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 prim 4 h1c+w*ow :fiat/rqbary of a transformer. Assuming 100% efficiency, how many amps at 24 i1 ob a*q4+ /wr:hctwfV 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. Thd,q idfd g( +.*esbt4 +) nop04lilgxoe primary coil operates on 120 V. What does the primary dr .ed4s+)4lonqti0gl p gi ,(+bodfd*xaw?

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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 primar(nz;0w jzsx:cnmr1 c*/eoy ;l y coil and 300 turns on its secondary coil. If 120 V at 2.*z1j(m snerz wo/;cyln;x:0c0 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 has 60 turns on its primary coil and 300 t -qmx7v1y)py2(v ist zurns on its secondary coil. If 17-xiy) zqtpv ( y1vs2m20 V at 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 its secondary +dz ,pi.hsusb;d,vg .has 200 turns. If the input current at the primary is 100 A, we can expect the output current at thehsb zg;,.,. dvdsip+ u 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 1.v mu1r.an1 uni1or t300 turns and its secondary has 200 turns. If the in.3 nun.rmr11o ai1t vuput voltage 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 turns and itsn/ 2t6 9 0nbapiao+j9wk7tern /qb2xk secondary has 200 turns. If the power input to the primary is 100 W, we2n96p7br2 /etb ao0k9 tiqnjn w+ k/xa can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage 0(k5 og ck/xtdpl fz8(is usually stepped up to 4500 V by lz 8/f 0pgd(5( tckokxa transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curre4 a0jcv /2x+ 7u8xx bf2rdsygcnt at 120 V. The voltage is usually stepped u cdx2 byxcug8v/704f xas+2jrp 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.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste2 :ra,5uai mc5 zy4phn)t1ujf pped 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 voltage ij:iypn4), czma55r fu2 h1 uats not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resist zgfo /p).yx/vance 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 transformezy/fo/ )g.pxvr with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resrw c/yj8s4y ;hev ;5v.eo*4p+q nabtfistance 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 steppedv yoeh jerpy. v4wa5tq+48;;b n/*f cs 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 line at 1000 V. How much less power would be 4 p;usbro;mi bcz1( lcenz9-x3etd 8 ,lost if the power were transmitted at 3000 Vnrzt8p(ce 31,u 4zmlixcboe;; 9- bsd 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 transmitted on 5 1m(d +4m-mhptixf 9ozp. fgna line with resistance of 0.60 W. To what voltage mu4-mp.ox5tp1(+zfg9 h mn mfid st 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 in the cmp3rc xwaysi *845,a0 ma q4pqoil'0m, cay8pp4w4s axqq*a m 3ir5s 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 resistor and an 18-H i mhkb/3xwt2 (zi9wke +nductor. What is this circuit'/xm ih(kk3ewbz+ 29wt s time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 k4cqtw 7sx j)(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 the ps-nvfco h7(2y eak 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 intuvp9n(.:vgorr/c t y// ic1rdo a 120-V AC outlet. What is the resistance of the lam.u:/vpctvdrngo/i y(c9r 1/ r p?

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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 vu,nw5d-pd kfl0grzpr8 3 0f. a 120-V ac power supply. What is the peak current thrpn,d.frzpl rfuv50g 8 w0d3k-ough 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 power supply. What ie)zcng +s/o;o s the power dissipated in the resistor? go+)e;c nz/so

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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 th.h:, irl m eebp o3g:z2k+k8$I = 0.80 \sin (240 t)$. 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 g;,wy rkxs)v(w(acj+85o tzj 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis v))0rg ga--v.)wp icbkyeygf*bu(1 stor 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 invzln46 dt:iyv i2h 4k2ductor 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 iidsd epf)5g..j 7:mw5 s3omjreactance 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 have 14.0 W of inductive re ;hn,e9jup z fsfwm;61actance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of ind)nmbo bqt.c 7 :5lx qrmh680smuctive 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 frequ 8+damnj7ia x8l i3md6ency of 20 kHz is applix md+inda6 ila7 j388med 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 c vi b8y-(g+kay-yb+crlp0;c m oil 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 reactancevw(p(.z ncsz *0bli4pdue,eii jy/p512 e-zv of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at ;q3bxo7emcu3fe6 b 0c10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120s(-6rha fg0zm0 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 rewwkvi.u t/5(z8 7bx.kl xr 6cractance of a 0.010-mF capacitor be 100 Wrcwb5v(xik..rwuk7 x8 l/zt6?

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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 capacitorwyz29+( 5sl)pcsl qcr 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 W resistance, 15.0 W in-am70 qr lvlum-)w9ynbg rs2 ,1yk*qyductive re-mmyr7gr*say l 2v)09yl,1bq k w un-qactance, 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-Ws39x3apc ) gy9lge bd9 resistor, 20-mH coil, and 1.0-mF capacitor araydes39x3cpg 9g9 l)be 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 zxost4 ,. ky jw1nhh56a 100-W resistor, 20-mH coil, and 1.0-mF capacitor, wn.sojhy6ktz xh154 are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in )7)ynt :dc6nsv;f7 uan fcl8iductor, what is the impedance at 1000 Hz7:l)cisnc6fu8 yv dnnf)ta7; ?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thea/k5hjm)4m*iy*i ogd phai4)om yim hjka*d/*g5se angle 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 seriesazfhkm:f)w3 /:j -lgjtn3n* h circuit with a 20-mH coil and 1.0-mF capacitor for a total inka-3hjn gj:t f h:lm) z3*fw/mpedance 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 r wikqt 639x-o9 gh 0zilfc(tk2esistor and 15-mH coil to get a total impedance itt6ki l9gcxk h (3f-qw2 0oz9of 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 seriebruma 6j9y :ekue-q9f*(xo9s e) t3dms with a 450-mH inductor at 5000 Hz for a total impedantru eq m9su *eem6b 9-:ay(k)xj39ofdce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.nhpke9 sg 572gxfo )vbpoys3 z tej ,:):c4ht30-MHz for a total impedance of g5eoj:7vyo:3exkhs) pct sh t, 3pz49gb fn2)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 is thex;-s8+l vroup.g. dyjs9uo k- impedance as-ygudx ;- .9 o+uvlpskjro8.t 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 for a tm .cxy6qerdq/) is*+dotal imm*q.6x)d d+/r ciqes ypedance 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 phaq;gkt 6zsx 64yse angt46gy6xkq ;szle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f;+byv y-k9 jcwor a total impeda+j-; ywy9v kbcnce 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 10b*f-ofvhafy+b b4(n . 0-mF capacitor at 120 Hz. What is the phasf-ob b*v.+afb4ynfh( e 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 mw axu ql)fa7q;x9 1g+6)pb 7yat)scr.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedglx sfq;a 1um7 tax))br+7w 6qac9p)y 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 105a: p))hxl,0h 7q2efsqvq byq 0-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 current in the ci:f2yea)q7 xh 0h5b qlp,)v qqsrcuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W,4o.ua9ysoupk.7 nrc a 8(b)he and an inductor of inductive reactance 30 W are connected in series tobkunoeoa )s yc. upr74(89. ah 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 a series RLC circuit containing a 50-W resistor, :t .te*e3tgckvz 2e 0ia 10-mF capacitor, :0z. 3cvg2et *ttee kiand a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistoz h k68--ctglpnd(t/tr for a phase angle of c kpnt- t8- h/dzgl(6t$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0;h/ ; /bvs fjs/l5stsf mF. At what frequency should the circuit be driven in order to have maximum po/lfbsfht//ss; ; 5vsjwer 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 13h v.cyh4,hcr13 gu( vjs nh+r2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit (4churvhg3nh .3+yvc, 1 hjsr is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an 9(4nu e s7dyz5oxulg. 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 Wr t8oz jy9abbv8k;.9a . What is the power fact89z;vr8.joayab t bk 9or?

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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 R l4-.xouyiw+ kLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0 lyu i-o.wx+k4.45-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 frequency of a 1.0-mF capacitor and a 15-mH coil in0(tvo2 u m prsn)2lu5t series?s t 0novp)5l2u(ut 2rm

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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 seriespr* t3gnh rr13gll)7 ee7j f8y with a 4.7-mF capacitor for a resonant frequenc7gp*fty7l he)r1g3rr3l8 nj ey of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.73hw e2q .hjgds-tco/ a e;8p*sn+ .cft-mH inductor for a resonant freque..nw;sdtc-asjq+ho g* 32t/e8chp efncy 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 a 40-2d/* g gem jkdj)b84 yul8cag4 04luufmH coil if the resonant frequency of the circuit is to be0y*ef8jgl/bdjuamcd l4u2 8 g k)g44u 1000 Hz?

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