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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: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magn iq+x0ozdur z.8a 8z+uetic 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 t c gb ree26ymui7-s6.jhe $emf$ 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 31yvo6r yxbh.wire in a coil produces what kind of change on the induced 136.yrvhy bxo $emf$, 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 o:x o-db vat,2vf wire produces what k,2vx:btv o-a dind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of cd4ufl*f blq pu76ite5 ,b 5-vhhange on the induce 5qbef-ti*f ulpdvl 4hb7 5,6ud $emf$, 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 frxp60 /g4*1a q-lcqo hdeo+dbn7y f.blom 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 directfbf19 m7v /vs/)ve mqrion of an induced current in a conductor will be that which tends to produce which of the following effv)m 7feb9//m q v1fsrvects?

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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 hor e3e5 2i2 9xdmj9gbaveizontal table. A bar magnet is held above itsv ej 95da3me9g ebx22i center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A/ z,dv9zdeiw-2g,g y r bar magnet is held above its center with its north pole pozgviz,9e2r / ,wydgd-inting down, and released. As it approaches 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 tabt65m* fx2 a5l3 ebbxfole top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed f2m 6 55xfe*ba3boflxtrom 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 inu rn16bw.ry1yt7 e.ueo w 7hp1 a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, whnuyo.r.r1eyhu 16wb wp77 t e1at 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 table top in a region where6tak p*j*rv+ :n rb epfe;-;ja 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 coil as the field disappears6; a**e-rper +ajbt n;jf: vkp?

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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 liesuaj i+nua9g5 - on a horizontal 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 induced cu-unu a+aj g9i5rrent circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering vp, ;+a+ dj6.bmam uoifirst. As the north pole enters the wire, thei m;b.j+, ov+6updama induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoiol8-ylvn8x7ns y ))ej ajn0) h3nw2 tse direction can be varied. In a region where a uniform magnetic field points straight down, what must jlxlnnnt2e)8 )aj vy73n8wioy -0h) s 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 rotated at constant angular speedo,mp u8 4den2lc n*ia( about an axis whose direction can be varied. In a reglud2 oc 8pi*men,n4a( ion 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.k 8d+hvv6pl7f a/1lc d
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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 tam l)fjuxe8 6,bak3w- hat 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 magnetic field. Th74jh im: gn0wz6edls4e $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-wljq0)+s zb iopjbg :;9est direction) is moved northward at constant velocity through a magnetic field that points straight downzob lbj)p9g 0;q +:ijs. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anguv eja 2+be-fy)lar 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 transforms.ifk6 n5lihnx kp/r 01

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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 6lk u,4i3 rmfkyf- 6xr/0 revolutions each second. The frequency of tiyrx-6rl ,uk 34mf/kfhe $emf$ 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 dev6+kee0*oms m vqd*za7ice 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 devicex3e5equ n l8pu,k q xax :p(9j:ay;er; that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the i 6at+ lpd *el,xz51fqh,wyy 6primary coil t 6l izth1,f5a,qexd l6p*wy+y hen 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 pu z4qkriv/q( pe ,e;qd4fx. 95h nkg iwu009nqrimary coil contains more loops than the secondary coil the9keqzh/ vq wfn9 00qkiir(dnx p5ue ;uq.g4,4 n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the p,ak3o)k -jcn1 mc f0f,g mtke2ower 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 resonantj8b7)x :tbph/f(cjj j 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 of ck .i;qqrzl tz(*: eb4e ckl5k*onstant terminal voltage. At the moment contact is made with the battery, the voltage * lk(zbzqtri:k5e;4*lq c. ekacross 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 d:1e+ pjrack0 *kneg;an ideal battery of constant terminal voltage. At thekjkg;d nar 0+ce1pe:* moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and roefs gwz2zvn tnp9:* 8o :6m7besistance 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 gss7 o3k,b)l jinductance 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 batterye* -nuxm i1a(m. The time constant for the circuit represents the time reqieumn*m x-1(auired 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 conto) yh;s6-y csxa1 o9pnected in series to a battery. The battery is suddenly removed from the circuit. The time constany1yp)-to;sao9 x 6csh t 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 units except:c5htrk+e n0z5)ysq n7

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectu;oz;wd*5( lfbb)a ydsn/(nl ed to an AC power 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 powerrha kp/:ge3l ara9tjy;/j75 jm ixi06 supply. In this circuit, the current7jr:9pmi 3jk5ja/lg;hea x/06 iay rt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in8 cvuh;p88 ukd+n2bk7 8macuf an ac circuit changes by what factor when the frequency is tpkc 8vh88; u mfab7ucuk8+2dnripled?

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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 dj uqn k+jw1fn5-gw z9-(wsss,oubled, the inductive reactance of that knqs9wf1j+ w5sgn,z--ws (j uinductor

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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 acros( /- -yskrseyps an inductor approaches zero, the inductive rs k s/eyypr(--eactance 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 supp 5b si0jk.4 rs)iwi)wply. In this circuit, the curren)js4wikrpb5)w ii0s .t

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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 bt6fz /9c 15 v3kvas6*ptyyznchanges by what factor when the frequency is t/t b p1 vy6 t*za9zcky3sv56nfripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the ca1zzg-gxil62l pacitive reactance of that capacitor-26gl zig1 lzx

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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 ang7)-w9musqmrzmt9k skv3.4ks le between the voltages of the inductor and capacitor in a R)umr m svk94s-kstw3z7qkm 9.LC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is 2m mrm ku gnx,5)5sm+qdefined 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 ifc : rdz+j.;vph R increases. When is this statemhdr +v:cpj ;z.ent 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 increasestl wirdywx tr0,*d.37 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 i6 sf9))ao1uj.ta2dsdic( chtmpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both dou -2eqgg /,3nrxnxt 9yuble in an LRC series circuit, the resonant frequeyr / txxg3,nngu9 q-2ency 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 AC applieds z0py-l+xg +k 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 circuitde vlunv.)ylq//p: k2 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 )i h. l7qzwof.4t. ucois rotating in a uniform magnetic field of 0.20 T. Find the magneftc ..7o .zlu)qh4 woitic 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 field o2q gnc tuovp0t3tyym91o,(b 1f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are p3no2 v,t oy(bu9t g1m1cy tp0qerpendicular.

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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 2i fj85lrqo)s(e7a dd0.20 T. Find the magnetic flux through the loop when the plane of the loop an sdfa(qojr7lid285e ) d 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 areap2 z02 4mfyvu +7bhwpc 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 change4s g2xhh-, jig9vi+yexaw z1.s from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped wi /g5l)ccac:2x8e ydzktsy / 6pth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0x2ag8k) pyt 5cy6cc/s ed:/ lz.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 axl j*8s*bwsts 4x)t+t nd 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 an c*szl*:5qphad 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 horizolof ;9pxn xdd,bdn, fg7,./nontally at a location where the downward component of the Earth's magnetb/fxo,, n d.ddnxgnf;,lp o97ic 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 angulpt6pvu *x/5tdar velocity of 2.0 rad/s about a vertppv t5t *ud6/xical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cro3h63( fj w hw0 u6wcv+6fdkmnnss-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 of wire of5kkcgza cf+j53 pxuzl d k6* z9i.y)8y 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 rectangulaz: 6: 6ykl:mlcciy4 wrr loops 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 sidyc:l::w 6i6c 4lzmry ke. 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 )ecb-d2l1g rh os22k rarea $0.090 \; m^{2}$ 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 topeq9 e/ 6;spou construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t6 qp ue/seo9;phe 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 witpmvmm/0m2 d 5yh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on wu z6 v )lazj33wx7hd,$120 \; V$ 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 ope+tvdl qc; j9j6rates on 120 V AC, and when q9jcv6lj dt+; running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thqxtcr1pxa6/u /)fh;my*he : be operating current is p1chx/ 6: uyat/hq;bm)fe*x r 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powe2iis6( y or-mu 8s jycctt)ih+,me/4er supply. The operating currentjy(/m+m yi 8t4r ieucehso c-i,26s)t is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co*l4q8fc(dtgz nnected to a 24-V power supply. The operating curred4( 8lzq ct*fgnt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltag-n 0wemgi4sn 8e 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 primarytq (d.2+ks g5gqeph8w of a transformer causes 14 A to flow in the secondary. How many turns are in w(tq de82qkhg 5.s +pgthe 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 ne. 5t 5ghn/ez8+ xthkqwcessary in a 110-V primary if the 24-V secondary has+.zqtnehw/5g hk8t x5 100 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 seuke4 -u/ *igfjcondary coik/ -*uge jifu4l. 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 transfornia, -yga dk7f/*ycd 7mer. Assuming 100% efficiency, how many amps at 24 V,df ca gd*y 7/7k-iyan 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 atht*h3 xy5 5cbt 10.0 mA. The primary coil operates on 120 V. What does the pr5tbth x3h5 c*yimary 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 tukn+bmvrvqpc1*/fd/wlq9* g ,ij2 yn: rns on its primary coil and 300 turns on its secondary coil. If 1+2vfd *j/l/ *9n m1wgcr,yi bqvkqp: n20 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 has 60 turns on its primary coil and 30 ljpc:o5mpec m :r013.qj8, zuss9el h0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curreu,j zes05hplm :c91q cm p8j.e3: orlsnt is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If.i-icid n 0qv 6sp0wk6 the inpu 0c6q- 6dwn.vkipi si0t 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 secki cu, 2 rgl-d3gdm.3aondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of t.3c2g dam-k udlg3i,rhe 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 suyince:t c x*yelt: 2hi d5/qnw/;1z)yd 8k:200 turns. If the power input to the primary is 100 W, we can expect the power output of thcl:1 yw8/ueey*dkn x:qh siyd5c ;/ti2:ztn)e 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-v0qdjc 2 2xy6yp k)myta7v553omdon. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondar2)-m0jmv25oy vt3pq n5 k6yo7cxd yady 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 current at ezof6,l3cn. d120 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 pe6dnc. zo 3lef,rcentage 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 voltagec zyws 90x8 f8sktll wo,4( :bs.wmt,e is usually stepped up to 4500 sw: t8 o9b.wk elcxsw y(z 0s8,lt,m4fV 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 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 g nulsjse i r8wa1: l;n11d8e;5dgsp;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 percentage of the original energy would be lost if the transformer were ns8;:1ei 1sn ga8 ns51pgldewju l;dr;ot 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 resistance of 0.60 W. A3o stjs8+m4 pc 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 percentage of the original energy is4s ocjsm 8+p3t 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 powe(nt hp1ro:: oxn u h;z3f9ksgdqiq+k9e9/4yjr would be lost if tp 931og ynktkf/e+zh: 9 uhs:9 qioj qx(;4drnhe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on -lrfp h(f2)s l ./epabv9p0 nda line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is / lp nelfa) hp02bsd9-vr.f(p 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 .vi-n ;gcvr2ithe coil's magnei.2cr;g- vinv tic 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 inducto qajqguzi-+82 r. What is this ci 8+agj2uzqq -ircuit'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 inapctp c.-3n z1l r,fxfa* wc(( an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC h;)fig.9 c jcboutlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placu3nv57*wm(ae dvw*gz* bbre/ed into a 120-V AC outlet. What is the resistance of the lamp?7rv b(veaw3** zueg5b/nmdw*

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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,d rmcgmjbuwg9bq9/ :*wid: 8. What is the peak current through th8dwd : m rubgbi:mgc*99qw/ j,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 power1eyyz eh 87;iiggsb -) supply. What is the power dissipate) ; i7z1 ghgeieb8ysy-d 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 resistor wbcdr4 htpfing9+8+b/4t ya: 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 5d uzg( q1o*y-q0-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 50yppxsj,5 2w w*-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 az: sj/ra0msv,*ki:9ah ewu 4 o 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 2.50-mH coil at 1000 24 fotrvc,s7siqw -m7 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 reactancek ;)-h( rwdmggin y4d2?

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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 inductive reab(0++c;xzxsi6a b, o hg;lwhoctance 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 in f z3dz*c8ly7nductor when 120 V AC at a frequency of 20 kHz is applied7f8d3z*zcly n 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 f-mn l9xyh/ mr/zm3 7na 2.50-mH coil 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 reactance of a 4.7-5 0o*qpy9pqpls-r+1qd ,n-/xp tf0ddjdirx *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 10 kkaco7oz5k4movq.392 q8 tddc Hz?

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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 5eeq r+v lm*.;xd t.v:k o.ma1ulqp 8iun1 w9h10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitivewi v-7ksl .,ar reactance of a 0.010-mF capacitor be 100 W vrwlk-7,a.i s?

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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 a/2; cmdrz9. *e0dfs.ql xvzrmt 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 resist y9q l(sb6yg a74ybf-.hqk.zi-sa( alance, 15.0 W inductive reactance,. a(q aby hl(g-iyb4asy fl976qk.z-s and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-v(b, ,dvroo+ j0ndw- xmH coil, and 1.0-mF capacitbo,or vdjd+-nwx v0,( or are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resisz.x dgc6 .7,-p nt 7xbkhvkbe)yb8fa6tor, 20-mH coil, and 1.0-mF capacitor are connected in series?7.yb,fgt6.)e 6 kkbdahv7znp x c8 x-b

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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,q2fg wq v:-pl0 what is the impedance atfp g 2:q0l-qvw 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 isdq4 m3mh qw69g connected in series with a 20-mH inductor, what is the phase angl63qdm9g4w hmqe 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 w-4.w8;vzdvdd ws 5 lqcith a 20-mH coil and 1.0-mF capacitor fcv5vd w ds4; 8w-zdq.lor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor anlhci,gy*ejw q08 w8 2ik-*obf(v mp t8d 15-mH coil to get a total impedance of 110 lyiw(qwj*f* kgb0-8oi82 ect m,8hp vW 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 pu+xo-g/qef:r2wipjy ,6 0s **zebxfz ut in series with a 450-mH inductor at 5000 Hz for a total impedance of zur+, 6 ewybgo:q f/0 *f sp*2jezxxi-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 seri1jd39 x (qf 4tc *rn)dmruiw(jes with a 100-kW resistor at 1.0-MHz for a totalcr4dt( u3rjixw mj*() fn9 1dq impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impe i ol1 0f3.rq;y;n-/yvxdgdr sdance at 1000 ;gyoxd n q3 d1r./ls;yf0-r ivHz?

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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 capacito, ylj,+/fqjj dgv0/* oagjg n8*u8wygw5f5 egr at 1.0 kHz for a total impedance of 45 W?jfnw /*5je*8 0yufgq g, y,gaj+jlg/vow85dg

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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 +kayt(abm b98*06m m 79 cllisj 1nzdzcapacitor at 1.0 kHz for a phasbm7i9s lmjy0b91t8(+ak a6nd lzmc*ze angle 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 foar+ p nnd5r8;rr a total impedance npnr5r ;8d +arof 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 capacitorc 68km bc4t rshte22+b at 120 Hz. What is the phase ans2bm 6rtk+ 8hbc24ect gle?

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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 5.0m qx781.ktc zsyb6j9f V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s 7sy9.c1k xjb8mf zqt6eries?

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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 resistoeer+jhb6 l5 *jni t0*dr, 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 td e5erb6*ht0 *jljn+ihe 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 (2fd14f :bdddn4yfh t, and an inductor of i(f1 tb44: fddd2dnf hynductive reactance 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 for6webaskz0i u76+/ ,c ehq:o4sf bg5 ep a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, f/qi: 47b6euckshze swop5ba6 g+ 0 e,and 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 .ebl/m o0h(4kqq /qby resistor for a phase angle ofq.0y4 kql( o/em qbhb/ $40^{\circ}$ 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 hasn 6hn h/ix3jh:ykj0)nr0 mxm3 R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should thh:6h3i00j) /yxn3 knmrxmnhj e circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit witeyx12y z6e3bvm,tfh- i76 yje h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 Wbex2y6t,evy3j7 6e-m i 1h yfz 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 an AC circuit:v)ppf sxyu8pgey m: 66xe-fr)7n5 ov 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 anzo)jk usai;,yr2tt u7- -h6qe0klqx x/ 6 a2gl impedance of 60 W and a resistance of 30 W. What is the power factor?xu q /;,sgoi0qekhy- l- ju6 2)a6trz7kt2xl a

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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 containing a 50sl, 86 a lrly,7uwymzg+c 12hcfis;.c -W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup,ayl;6lls 8,sicfwm1cy7g u .2 ch r+zply?

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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 8,n1gb/ bu,8u oi,ech4c-iuhw k 3so f1.0-mF capacitor and a 15-mH coil in series?/o-, fwuubc4hcs ,ob, n1 ek88iihg3u

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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 capacb23 wtl6mwtx/ tsj 67gitor for a resonant frequencgw6t t3mlx /6jw2 b7tsy 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 iqj5w.it*az-x5y 2x x kn series with a 3.7-mH inductor for a resonant frequency of 1000xxt .52-ya xjzkwq5* i 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 v4:laxm sx /l81/ j,;whq ngemseries with a 30-W resistor and a 40-mH coil if the resonant frequency of the , m/j;v4gn8xll1 e :w hxm/aqscircuit is to be 1000 Hz?

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