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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units oovvq g9b/77 uef 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 induct( a/df 9cwr2;jfl/ nrd1 ecx9kion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil producesjxlcu.qu, fx+ y vqjp08+w0 p a c,vxrha822t9 what kind of change on the irhqp2jauat02+xfq, clcp+, x8 u.y 0 vj98 wxvnduced $emf$, 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 t2ag dm 1muf .j5+*rziohe magnetic field through a loop of wire produces what kind of change on the induce.um mog a di5f1zj+2r*d $emf$, 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 prodohrv*6:dg2vn f 2ip z9uces what kind of change on the induceg6zhni d*o 9 fvpv2:r2d $emf$, 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 61fnq uy) :w3wweol4 rdo2c7mc /s/me 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 inducy3xyr y: j1hg4ed current in a conductor will be that which tends to produce which of the following effec yr gy4jy1xh:3ts?

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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 t03gmo 3wddp l66epth uhq+q05 able. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed frtge u+mh0p 3d6 p035 lhodq6qwom above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above hvjh3k lq:tts7 o8/ c7its center with its north pole pointing down, and released. As it approaches the coih 8qo/ tcl:h37v7sjkt l, 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 regi. j)ymo+ jds+hon where the magnetic field vector point+y mo .hj+sj)ds straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whered39,tjxdxr n: the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above9n3 xdrd:jx,t , what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tfl+ opol /z747z,ytao 9mti2xable top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this cozt49,ftmzya oxolpi72 7/+l oil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table an0yuixx(4 b hmvmryf0 8otj;69d carries an ever-increasing curu iy 9fthobr6j yvmm(x;04x80rent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire withtobne./: (m p jrp6e+a the north pole entering first. As the/+r. bem:japp6te( no north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ang,u+vc dp +o6-+m qa0uv+fvxmuular 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 rotatiav,p+ u+6d-v c q+0vuu+x momfon if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed)y-i/ opbppd, bj38 ec about an axis whose direction can be va-)ybi/3 cd pbpojpe,8 ried. 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.p f43e w(d2emb
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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 aif nbzh366 4 x-d4 px4c epd:qy90te )kxoh7jnn $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic f 5ze(;tym jf0i6g-g4 cgppx2q0lr1o 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 th0z 74 ,r2e zbbsxi.sff.rrmm2e east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statem27ff rsrsi.bz24 b mezx0m ,r.ent 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 constahrq 7k/a g85fxy. iouwexwsz6-n / g)8nt 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 transfox /o1wywvmsiw6 8z(xz ew ,7n9rms

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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. :sib71-pvpr e The frequency of their1b:-e7pp vs $emf$ 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 useydfpe5vu*y 3+ d 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 c4kzc( q* wdjp8z;j8hthat

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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 primary cocih/lvcz6 v2wmg8zj. *0: c lqil then it isilz:c80vj. zm*w /vq2h6c c lg 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 8ktwq+d (k (swl8vsc)coil contains more loops than the secondary coil then it is)d(ck vktwq(s l8 w+s8 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.y ,ics;pp/f th3k5io 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 cir,ot /c1-e gzehcuit,

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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 wt 18xbm: f5 mij)90lt cvsgl -s;.bypto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosw 1 cs 8bm0yfxlp9tm vit5jg.b-l:s);s 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 induu3t, c hp0uly2 b.rc+x w4 9qt(fgfvs9ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery,0qy4x tfh99p2 s(rcu,u.g b+lfcvt 3w 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 resistoaob).ov :qs 3ance 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 resistance R is co2y:5j0(5ygn.y fox uzrvv*y3 /gvcp hnnected 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 induct3nq0c0 cr,ynpa s8d ).fo;r7zht ah1kor are connected in series to a battery. The time constant for the circuit represents the time required for the current to ref aqz)n;cpt1 s8h07.y d0 ,ark3nhcorach

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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 *73g5am6-lz+wnx jci mm cf e0connected in series to a battery. The battery is suddenly removed f+al 5mc-0*emzg 7fcjwx n36m irom the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same 50e r* bxygg7xunits 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 tkb1xy umitxr: */eh d -,z(8+xr.anh vhis 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 supp7bz6 1nj.s n zb(dc,tply. In this circuit, the current7tcjnz(sp 61 bzn, .bd

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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 aaij2gj, l3,ex z-ob2dn ac circuit changes by what factor when the frequency is tripleg3-ez2 2 lx ,oabdij,jd?

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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 doubled, the inductive a7apl997v 5z 5- pk 7(uc,qwbaee cychreactancc(7e5apl wa7- ubkv9c e,q57ha9 zcpye of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acrossije -wslr+n*8 *yh94fib: qv u an inductor approaches zero, the inductive reacta q:yw**e- +hus8vb9nrij4ilfnce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuitjpkxa-stiq.m(0i. i1 , the currenpxm iski-1ta.j(.qi0t

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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 dcm pzc)l 0jgn8w/4r2o -z9h jwhat factor when the frequenc)z nohrcdp- lm/2g 09zc8wj4jy 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 +dxp42 cbvrh+bp(0a*w8xg q w xva; t7a capacitor approaches zero, the capacitive reacta xt+vrg 8pcxa ;pah0w+ q2xb7b4*dwv(nce 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 capacd.3vk ve0(n uyitor in a RLC seri 3(v.y 0ekdnuves 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 lbm:.1q:pz6wet6d13tclap im 2b,0c vm -zio circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incsy:: hn, x6hpbreases. When is this state sh6,nb:yx:hpment 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 increas-p 9/d8s84zbp*l6yvb z yq fvees 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 circus3l ghbck,o 2tk34jd*it 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 LRC series circuit, the oczdloak.yj; 7 iea*//d7lk .resonant frequency of thatdi/do ce a7 .7.*y kzollak;/j 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 a i(rm 2yjyg133isogj2 n 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 serie3cs; k 3). +ynq,vfcaon2ibnh s 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 rotatin .hh x,k 4szvj.e.ei*t.v7c hhg in a uniform magnetic field of 0.20 Thee4sh .c*t.7.z .vjhhiv, kx. Find the magnetic 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 uniform magnetic 9e(d6 pbxt3 t3)sul oafield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arl3tue)9 ob36(pdatxse 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 az5z mlzz;t,h 3 n.qr,*wogu: ndp*,cn uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loz p: ,z* nqd,g,u5wm r;zt*lcnh.n3oz op and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single lbm3;jm* r 2q cf,sdvv/.ofz:xoop 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 froo0twvkpu+/p1 m $4.0 \times 10^{-5} \; Wb$ 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 edl35l1a;pc +y5k bxf+9 ejzk18 cm. A uniform magnetic field is applied perpendicular to the plane of the co3 ;kec by5efjp 5xzl1 dk9a+l+il. 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 an arz k+w3 r gq(z4nt: emaeewt 9e.3jhs+:ea 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 arear:gm4b2 hrrsw xmh*2 ) $0.20 \; m^{2}$ 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 z+,k0yuu is)pm flies horizontally at a location where the downward component of the Earth's magnetic field is)kzis +0,p uuy $6.0 \times 10^{-5} \; T$. 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 xp/k x2v1ln3jr;f i,blong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends fjxx3k ,vn2p;b/ il 1rwhile in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sect pa54zx 1m9kvk8fnrv9ional 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 of wire of g-noho;r.18f sis bu 1area $0.090 \; m^{2}$ 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 lux( obcgqexbm l2p/ q(9*,i/voops on 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 rotate2xbq * ue/ l((g9qpc/i,vmobxs 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 or 4e yo(j5g(oob;byn1tp9c s)f 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 sizh qn ,)quu wy um(f)+d-z(v;umple AC generator with an output of 12 V maximum when rotated at 60 q,-ud+(u(q nzumuh;vy)z)fw 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 ef/b*ico14zpn( el ,b 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 resist 8w+ q6jg)bbyaance 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 motor 00gq5q*jcdy nw.hbvc+4n/ c g operates on 120 V AC, and when running at full speed it generates a baqygq0c0 chn w4dj+b*5c/v ng.ck $emf$ 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 xr9y7y7n0 rvs resistance 6.0 W is connected to a 24-V power supply. The operating current is yrvyx7r0 7 9ns1.0 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 supf 98xcne(cb(j1,a zihply. The operating cur8ac9( ze cni,fbhjx 1(rent 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. Th*3qa+xm v4p6s/trm dn -cyii(e operating currey s*n/6 (qpmt +icr4-m3ixdav nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is ne s6h ;vkzxd0crk,6ry. eded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in 3zzq.hzt k* /sthe secondaryh.zk/t3 z* szq. How 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 tuasyq*al )s q2ugpekfu 734:j.rns are necessary in a 110-V primary if the 24-V secondary has 100 turn 3gfy ls a*u:aq4.j7ukq sep2)s?

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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 set) ,h*-w byfpmcondary coil. If the current in the secondary is 3.0 A, what is the current inpbf h)* m,wy-t the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 102kv)db 5-momjfre) k;0% efficiency, how many amps at 24 V can flow in the seconda-)vb5jor2kmkm) ed f; ry?

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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. 39zb u-)t jacw,ocpxo nsw 89, The primary coil operates on 120 V. What does th 3ut)c,sp- awwjnxc8o,99zbo e primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s. *sxj5 6f94cieqtatiecondary coil. If 120 V at 2.0 A is applied to the primar54fes *. jqatxi it96cy, 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 300j*1frwd0 * pn7e sptc.8.ro);rf vega turns on its secondary coil. If 120 V at 2.0 A is applied to the p87wp e pcv* tfd) .foes0rg1j*r.a;rn rimary, 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 tl )b3+qp3f+g8yw6bodf.o42f0 ji wal s x ;upiurns and its secondary has 200 turns. If the input current b) 8wwf2y;bo 34olsgi df++.ixa3pu0p l6jqfat 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 ga,vun)c 0xsx2 i4xcxm3/u a+turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltaa xucxg,vn a3im/c2u)4 0x+s xge of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2006w m+ra:vfx(gtf ok y8hp;u.* turns. If the power input to the phvgxp+ (w.8y a*6 fokmu:; ftrrimary is 100 W, we 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 is usually s,+q+d mwaxy d6tepped up to 4500 V by a transformer and transmitted through a power m6dy xq++,adw 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 curreew8to) se1b*t nt at 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 percentat)btw8 1e o*esge 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 1gsfnrkk5tb )/ hnj,h l:-ci)-h k+bx. 20 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 percentage power lost in the transmission line if the voltage 5-br+ hhc j)hk) knngk/xsf-tlib .,:is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gefa1kb+wd hv62 nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if a hdwk v+6f2b1the 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 lio+r +w-8auol4va v f*bne 50 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. What percentawv f bval+*-+ouao84r ge 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 1000p n (zl5(omao; v3hb0o V. How much less power would be lost if the power were transmitted a v5p(bmo zl(o3a0 ohn;t 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmittwzcr 52;o2gmged on a line with resistance of 0.60 W. To what voltage must the generato2zm cggwo r;52r 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 as(ri ;v j5lrc+ current of 5.0 A. How much energy is stored in the coil's magnetic5r ;+(jsivl rc 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 gb(zr5r 6i+i tinductor. What is this circui +i(6b5zgrirtt'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 /gj - njztuo(/w;adt6is 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 the peak cunmr ce39mdn38 rrent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance ng-s c;*)itdv of the lampd*i c-n g)st;v?

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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 szow n*kw/:q b:upply. What is the peak curren:q wzb*:w/k ont through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is con6n:ew;qg sk- nnected to a 120-V ac power supply. What is the power dissi6n qsgw ;ek-:npated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistok m6c+y,giix b0mf d6.r 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-qunzzrses38 r994f2 43cjd gl 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;sa-vz1 nm yw7a9t0rp -W resistor 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-mbruz:ze b 59gx/u1:j4kwe rg0t)c/vow kt/ p *H 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 2.50-mH coil at 1000hl5gfl68- )nt bapgx :b vf7s3 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 14.2 rmxu /.mu 8x9v2.qjbkd;hug 0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W o-b8fk6.w9sf p*n fp ),lxn*shxw 5 x1dhobo z:f 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 p5x -y n uwxu05so t,-f8la6ulAC at a frequency of 20 kHz is -w08ytx opnll65u xf,ua5s-uapplied 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 source?-q g8zw-y/3ake +xgz.bcug/v

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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 capajbm2 p+qra/imkjt1w x5j,2pu/c., t zcitor 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 wb)64imgbef;: p.waw to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12008f+j rv+ljb8p3 7chzt W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1 m()dxe)myxzak/ u5o* tr(u8 s00 W?otsumx erku85yx)*m) dza( /(

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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 and hle/ * ebsql/5pl6** gvquhu, 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-mww 4+wnkj2t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivew+t2nw- m kw4j reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, ofjt57k) p f dh5h/qdtwx(o +920-mH coil, and 1.0-mF capacitor are connected in fxtq 9( 5d tj/f)7kwpd +hhoo5series?

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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 resistor, 20-mH coil, a-q4 (1etkkyb y l.rqf5nd 1.0-mF capacitor are connbef(-r qy1 kl5.ty q4kected 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 *k2el-i rw +p9cjiq;gwp 2ql8series with a 20-mH inductor, what is the impedance at 1000elgi + p9jw8qc2rk*il2pw; q- 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 isabku h*cq ,) 3:sxx+km connected in series with a 20-mH inductor, what is the phase angle x)3kkmbuc haqs+*,x: at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH w0 xcwyu1/;;j /q7(xjo lgwhrs7fj) kcoil and 1.0-mF capacitor for a total i0/wjk1(j o l ;/wuy s)cfw grhx;q7xj7mpedance 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 followi+-y8zeszin tay)nq-*37dz 6q u 6ama jng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of aaiyzetmq -dq n+-6yzz*n6a )ujs7 83110 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 sedf 7 +fsqh4es*ries with a 450-mH inductor at 5000 Hz for a total imss *ef f7h4+dqpedance 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 az f7pi3 xj d:8/t51r pu5gj5vatdgz+be put in series with a 100-kW resistor at 1.0-MHz for a totalzvf1pdg/ i+ 8 :ux 57 agatpzj5dt5jr3 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. 5.)n ),*iq tze cosibwWhat is the impedane*cz t5)i,ow . sq)ibnce at 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 *ewc/ x7z:3klr gjqmeko,pql;k5o ( : kHz for a total* mkozqj3xkp: ,5; r:lqc kw7oeeg/(l impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a 8 :p5cg9phi umphase 5gpi8:ph9 u cmangle 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.s8pxdpmta1z,: b g xb24 n9vt.0 kHz for a total impxt1,zv 2p bdn9 s8pagbm4 .xt:edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor y/lj0qf f.o /cat 120 Hz. What is the phase anglefy q .//jlc0of?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz ifg01qd.ntw h/3 s5gtwe k9yr4k a 100-W resistor, 20-mH coil, and 1.0-mF ctww g sgky19d5 .n/hq ek403rtapacitor 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, andet89 ydg -l ld5r;ww7b a 0.350-H inductw5;8 7bly lgr9wd-d teor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, an;zl f:d)ox0o jd an inductor of inductive reac:;do0 lx)ofzj tance 30 W are connected 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 a series RLC circuit containing a 50-W rest6a95gcvq h 07dkltr: wceyl3f4w4 /distor, a 10-mF capacitor, and a 0.45-H inductor, when connd vdfqtcw lg/4w3h:9 tl6 ya 7rk405ecected 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 rfj.nha/15 wf xesistor for a phase angle of 1/xf.janf w5h$40^{\circ}$ 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 = 10.0uzwiq,k t1 10u mF. At what frequency should the circuit be driven in order to have maximum power transferred z,qu1 tk01u iwfrom 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 w9(lra+ zkglm+54adlsith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pow5mz kalas9+ +rl4gl(der supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cij(h q xxul7 uqn9:r4u.rcuit 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 Wg/w0f+-wnm ( 9jp8x*sdci fxo. What is the powe+ps fx9xigmw0c -*od8w / (fnjr factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor fo+vielr+b2- c jr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when c crvjb+-l+2e ionnected 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 fj;l jptg,x2ztja0.hlg, 8mmc ;.. x xseries?lp,x;; .xj0.zjlh g m acmf,j.xt2 8gt

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capa7.ilw ))2 yn (jsjtg;6ojxhzh9asa l9citor for a resonant frequency of 10 kHzhjt;y(i6 7a n).)lox9hl sz29jwagjs ?

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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 f5cz0j tf nrtb+l. gpg x4pq/,q q2km/2requency gq/2q pnlb 2+zck4f.,tj/rxt 5qgm0pof 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)2hzp/j rpe4zq. iqw:i3 *l qm-mH coil if thehi:p2/j 3 .4zqqmrw )qz*eilp resonant frequency of the circuit is to be 1000 Hz?

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