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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 r :rg.ya-,wk;i:u l ibare 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 statoe5o sp )b1t*pdzrq yh7,s r15es 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 pr:tda9b5g lv63h *f4pbd6,zyp rwk9dl oduces what kind of change on the inp6y dp*k:hwr6gdt 9 b53fd vll94b,zaduced $emf$, 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 w5mig3 gyt6,hev2g1xyopq(pq5h s; :wire produces what kind of change on the i( ; v5qs 13 o:mwgg5g26tyy ,hpxhqeipnduced $emf$, 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 dmrk(we4 na1n +rls6rd 3a;z(loop of wire produces what kind of change on the induced sdlr1n r(n za;m4+ e3rad6(kw$emf$, 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 5fq2:2, s 6gdlm pforsa 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 lamm, xf/g *t scv.30kppw, the direction of an induced current in a conductor will be that which ten0m /3*mf.sg ktp,vcx pds to produce 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 flat on a horizontal table. A bar magnet is +lm 2mdf(mbn+h,hfgr qc :00eheld above its center with its north pole pointing down. The sta f0hcde+mng +r(m0h 2, :lbmqftionary 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 bargnn 5d b9wij/pf7 w;3z magnet is held above its center with its north pole pointing down,9 7z5/gnn;3jd fpwwbi 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 table top in a region where the magnetic zq 4zkh ladb*i;y(v)2field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of lvz;y ba q4()dk2 zh*ithe 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 where the maz),l9ue xt1fxgnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increu)ze,91 xfxtlases?

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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 horuld ve/.:zhoxc:( :.4dupt oi izontal table top in a region where the magnetic field points straight down. The magnetic field disa :dd puiz:ev th.olco/:x4 .(uppears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increzr *lhsiki ,oy/30u3 easing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced cu3k0zyo ie*/ lu3s r,ihrrent 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 nomg,-: xzlxh gy(1 hk-erth pole entering first. As the north pole entymelh( h1kg,-: -xxgzers 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 angular speed about an asezlg6)m0,ya xis whose direction can be varied. 0me6za,)y sl g 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 ro/a50l/bamgzrd5hy h+ tated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strailmh5/gb yar/hd a z+05ght 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.)z oyr95ersy)
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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 tw:d .rg93 vt pi ghxu;rxr;*7ghat 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 1d7 82 hb2dywe eyg-bra 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 lp5o )coe*j., p pktqy1b2s x;fk8 0xeeast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across5jo)t* seep po. y0p2 kb, 8kc1;lqxxf 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 veo7v i6ml0na -elocity $\omega$ 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 transfod l7cusmzjo 5u( c w)4n)ty6kc. 3lu,yrms

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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. The kru/ ;)ge 4w 2spm+gdefrequency of t)g wuks/4 rpd;em+g2 ehe $emf$ 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,u p1o3ifcvq 4;cw5qb used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device dtpfob/ a/y l3(i9it04hm y1vthat

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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 semy66 4 vtqyl7ucondary coil contains more loops than the primary coil then it is l6qt74 uv yy6ma

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loopn4fibg*gt;2a dlt6un cel z 5b,6:u-ts than the secondary coil then itac b ;,6tbu5gn* 4ige6lz:-u 2ldnftt is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputy7 bcsx09a;2 oxt:i 1d4rit dh

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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 circuiefg ug;/(/vt5/ ebw (naphhtv.d*6ert,

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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 id 6j6vg g5 dlm79wdodg t(i fk99vtb:r6eal battery of constant terminal voltage. At the moment contact is made with the battervbod9(:gi6d t mdv9 g9l7 wf6r j56gkty, 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 induc; tcu07l oa8fetor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the in8e0uao t7flc ;ductor 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 j: 6fyj9y7cpl and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resist2m( hjmo ml .2cl; np5tkz+/-xsqbj9iance 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 batteryq:sdc; dc8q3wej5em:. The time constant for the circuqd jwcs 58 3ed:;cqe:mit 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 to a battery. Thed z)lqp6+l d7r,g.+23a rcw ku,od rne battery is suddenly removed from the circuit. u q+32,droddc+p rwl6.)k,gl 7a z ernThe 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 xwfo8:ben f fh4 yg+ 2gd(lm1it i-g1g1sq1 4ehave the same units 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 circudw-pzre.l: pd qo/02iit, 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 connectedy ;v(pveh*dg sh,x0 f*kto;.i to an AC power supply. In this circuit, the current hx;k*so0et vh;yfgp(v* i.,d

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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 changes 7dhj d9bzj)e 6by what factor when the frequency d jze)h6j97dbis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is +j 7pzsq1t7gx doubled, the inductive reactance of thattjz7x7 gq p1s+ 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 voltn;h7 s (wfsz0:ul0gig fd*r.tage across an inductor approaches zero, the inductive reactance of that coiln.*sdrl(wu0zsh0g;f: f7ig t

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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 supplyta4m glov5v./ l7h0tm-7 ggrt. In this circuit, the curret7mr5l7 vgvaot-.0lg4/ hgtm nt

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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 when the*ouv2 dp 4e wzhg.4z/1nmdls6 frequency/42dlv.ws* p 61ed4uzgnzh o m 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 v wlzp4 xe :ibd no44cmk*b+it(z9 /s;goltage across a capacitor approaches zero, the capacitivezw:lnb z( ;4 xm4ekoi/ti4c+ b*p9gsd reactance 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 vol *(y cp.q1gg 0d4ra;mtde/ sns4 nf*kgtages of the inductor and capacitor in a Rt1sp 4n*gy/ngaqd.;fmr4k0cdge( s * 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 y;s)1:rayitao8 e y7 v30cme icircuit 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 9v4 emr ;uc+fd5 oa2vjthe circuit increases if R increases. When is a v+rvjc;u925ed f4mothis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of 2uwz 7.,z-kygwqr le/the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedanceei-ei+(m hppz 53be v3 of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu4:.ag xq1iv) hdgshgpcd z.17it, the resonant frequencds qdcgia)v: 7.hx11 ghz.4gpy 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 circfhv;w o mk--ajg *3qk+uit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cqt5fqplyt2,cm) ; q8 jircuit 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 ;h4 e(ov;xdi g0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when;o ev( dh;4xgi 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 rotaq7wkb iw65hpd; lu87u2u,im s 8ky nh5ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through thhyk,lpm ud7h2678ui5 ; kqiunb58wswe 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 fielgc1 ;w, 85jjnj6,qenr*nzdjc d of 0.20 T. Find the magnetic flux j g,,jj;qnwn*nr6d8c zc 5j e1through the loop when the plane of the loop 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 loop is reduced fro7oyb d,f6a (pqlviqjb28t o784an;vy.- kctym $1.0 \; m^{2}$ 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 chanp s2z519rk gr9s kcq 1a;v4iemges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frsqyqdd(;f0q2 ame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil; qd(sy2qdf0q . 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 wirerxr 3 iq0co58q with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and qq szj0;o cb.9g)n y*uarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally aft ts+;x jno 19virv67t a location where the downward component of the Earth's magnxv97 +tts jn;io1 fr6vetic 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 bfn;z5ll(x6md ) w; vggar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of itsw l6nzd m)g5;lgv;(fx 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 ha2xh. dbyn9 -ihs 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 wjf)s u+qz*h5 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each:no2g9v( xnt-po ee w: +sdc3z 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 0oezxs: n po- g2:+ vwc39tedn(.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 7iazky8.plwl;.l r247:aix cg oog s*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 Avs8gb 6 t6f1r,j d7ieoC generator with an output of 12 V maximum whe dg fe i,16s8jt7rb6von rotated at 60 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 witclyi gykmoi :4l.+;1ah 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.*oky*9 spbd*/h--vq b;mzd v/vkct5c 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. Then7w7s-sq kuy9 motor operates on 120 V AC, and when running at full speed it generates a b w9-77usn sqkyack $emf$ 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. )/fsg9 8cwiij8ot or1The operating current is 1.0 8 /918iroojgisw) ctf 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 supply. Tdhqlpb*njz..r4y ak*45 ed 2nhe operating current iezbld*.p. 5k jnrn 4a4q2d* hys 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 connectewhf(h qhog9z/eyvq0 2)u3;sg d to a 24-V power supply. The operating current is 1.0 A at full speed. w9 2/()ho3e hhyq; fqgzs0uvg 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 transforme0n7m n3;(uh xt)pfnqs r is needed 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 the secon-pvr- gma) g7odary. How many turnsg)-or v7agpm - 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 udq 27j 55zyi(beih .t110-V primary if the 24-V secondary b.7id z2e( qjy5ith5u has 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-j 0d2qni-lqv1y :pw1dturn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.11wvpq lj2iq0yn- d:d0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effic0i2plxwvt :(h iency, how many amps athw tp(:i2x0vl 24 V 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 signfznkd*d os ;;) transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V*;k;fndoz )d s. What does the 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 pnw0*3z lgih+e bqvi4(rimary coil and 300 turns on its secondary coil. If 0hle(q4b3wi vg*i+n z120 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 turn4ev;fn7i 1qap+ sa kg7s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p7sv;4afig1nq +7pekarimary, 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 tran9/+s l2m3dbf2da awqbsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sec2 bdba9w23fsd qa ml+/ondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hasa 5qj7ac6f7q+wmepeg 2pz *; b 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltwq+ *magp7 2bcae6;eqfj7p z5age 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 ha lr)wp )65mzbps 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powepzm)r )bw5 l6pr 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 steppedt 8:o 8id7urx0s9lx2zdmj o2;ubaz ,f up to 4500 V bm8u0 ,bdto: 8azjd2 xzrso79 i;ul2xfy a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage id6 ofs9ar 4sj ;ca,4x64wpzcz s usually stepped up to 4500 V by a f 4jz,z wcss6a9cxdp6a4r;4 o 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 cua9(vo 9w b7orj /9bsqlrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 19bjobvo 7ws/r q9 (l9a.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 *.* 7qtdaaa fvhas 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 percentage of thedqfva*t *a a7. 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 resistance of 0.60 W. A geneef t02;sah9 1.b(6l uatapw wzrator produces 100 V at 70 A. In order to reducw tapea.ls ;wfz06huat1(92 b e 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 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 transmittebiuj ta-z-n:cj;8sw ,lgj2 e 6d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000iwzg,j -tnj e-bjcsl 8a 6u;:2 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 a line*z/ct; p fiwq: 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 not to exceed 0.*w pqfiz/t:c;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 col6/zp1 y-tcvhp64hll (r 5mvdgemk 0*il's magnetic field5dll kcmp6 -p(he4/hz1vl6g 0*mvyt r?

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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 6q3b+lz (5*odfdl zxu/.0-W resistor and an 18-H inductor. What is this circuit's time constant?lzb*l q zu/(ddfx3 5o+

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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 ACxsf . .j)rf*px;qwa+ r 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 placedy*m9jy v bm;5x into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistacm)s/5ua8sl.uj4 7j snuygk5j.n n g 7nce of the lan.gukcs8my 7l .gnnj4a7/)us s5juj5 mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak 5 4zti nt15h zvi(zyzlijhn(h /8zue9.)b4iucurrent through the resistor4l e( )b9z/yh z4(.izituinn h h5vz8 1u5jtzi?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powerh;tg6 gr, tm;o)-wvjy dissipated yv;t gj- 6ot)rw,;h mgin 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 tn(f,, 1 c/ovgh4i4,oeii yv ua 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi7a-l z:v ghf; bt7cfp0s69xppstor 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 e8 +tk :mlpy+ca 50-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-mH induc mm.af/*2hna o-lqh.oay ko(.g) w-ketor 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 ofn4ebbw: bnteq1 iz9(xv7y 8 4m 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 1 dy(trza *p-a44.0 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 of inductive reactance at 100u/ci3lfhy)z c 7-4wnn/lta 3s 0 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 frequencyv1l9rk (i cojdy.vn j/( re))r of 20 kHz is applied to i)eo rn9cry/ .j)lj (v rk(iv1dt?

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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-)0cn wp8j8oqsrc52ioV, 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 capacitiv;w1nv3n:i: z*f mf+m-ph i ygve reactance 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 reactm -v06dfu w yzp/o-d0vance 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; dmdmfdndgo5 -h.i6 * 10-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 capacitive re hq5ta.ld1,z .s6bnk1auow4oactance of a 0.010-mF capacitor be 100 Ww1azon41 a,tdbsk. uo 5 hq6.l?

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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 i tz;cr64c8h:c:7n8dzmkw d q1000 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 akizrq0w rh *n-u+ yad:6 jfntp:314bjc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W car:by aquw jfn:0p+tznrd-61h 4ki* j3pacitive 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-mH coil,48, iecf pqkc/qa,ntop xl.69 and 1.0-mF capacitor a,x 4i l.n/kpp ,qao9 cec8fq6tre 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 aad *u7fovi w:8 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c8wavf o:i*du7 onnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what ihz5-hnf+ rov j5), emr7oml-a s the impedance at 10005o ,ha-z m7e+l)rr-mnvo f 5jh Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected (2qh+xhcym0fcv .4te(/ x i/wo uxk4s in series with a 20-mH inductor, what is the phase angle at 1000 Hz?x(ov/hm/ f 0 x4e+tyqcx (iksw2.u ch4

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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 mn:uy0y 9 c dmosr g99ds/f5k3circuit with a 20-mH coil and 1.0-mF capacito99m /s u3kdc5md r90ofgyny s:r for 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 serie bk4 k+9c4z7ugz,q j.2ynmlmms with a 100-W resistor and 15-mH coil to get a total inj+4c.m9yk 2zb74zmqg ku,m lmpedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at9i rp( egmj6b kcy3d (x/f:v+p 5000 Hz for a to/ gpjx ym(vp be d69kifc(:+r3tal impedance 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 at4 ifl. m25zpbp 1.0-MHz for a total impedance2i 5b 4pzmplf. 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 ca4q zzi *c8,y 4gpvs78fl. biucpacitor. What is the impedance atc4 fl.y8ib,8* qpugs i czv4z7 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. 6f d)hb;e6 o4xdkibh30 kHz for a total ih b6hof;xe) dkdi63b4mpedance 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 with0syav2jnv s:ir6y 9p9 a 10-mF capacitor at 1.0 kHz for a phase an s9:2parvisnyy6v 0j9gle 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 inavddj/2u9 3g7zs jvc xl94mjwh xz42 6 series with a 30-W resistor at 1.0 kHz for a total ix jzl7avd/32jsm94z4vj gwuh6 9d xc2 mpedance 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 100b;s sxzc3tj z2 h)cay55z,-/qux k2hy -mF capacitor at 120 Hz. What is the phase ancsz/z5 q2c t uky3 5yj-2 xsx)a,bh;zhgle?

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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 if a 100-W resistor, 2d5kpw 9w: w*bdb0jf1p0-mH coil, and 1.0-mF capacitor are connected in serieswk0pj db p :*wbwf19d5?

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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 cgb3p67:)vl:l; g fyflm yv3mresistor, a 10.0-mF capacitor, and a 0.350-H)l bm3yglg:cf36p7: vf;mv ly inductor. 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, and an induct/ b 8diathbllt5,;w)m or of inductive reactance 30 W are connected in series to a 110-hidw t );t8bbl5/,l maV, 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-Waxvq e*) l5,xwy(pww) resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl)w (leww,ypxav*)q5 x y?

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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 + 8uygeyer )e-series with a 500-W resistor for a phase angle of e-guye+)8 e yr$40^{\circ}$ 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 mF. At what freq717)nphb ora0z ta8j bb/4rhduency should a1d80 nbbrh/rotap7zb h 7j4) the 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 :eq i7t(ll k whrm30be( f2)oacircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit iso3ake iqr2)(f:(l0hbew7 m tl 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 isob:1 cn++ki)qf 5cbdh $63^{\circ}$. 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 resistago i-0 d/ qj+ )q*vdupbq6e.bince of 30 W. What is q6i)od p+bq-.jq0bu /v egdi*the power 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 for a series RLC circuit contain *ry3u.9o frcning a 50-W resistor, a 10-mF capacitor, and3fn9yo* .rcru a 0.45-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 1b p;gbpy,*p1c5ajr+z .0-mF capacitor and a 15-mH coil in series? p b;jcpgzb15*pay ,+r

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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 capacilt8-4o ,p h/wf:dx4 sbbq s0zktor for a resonant frequency of 10 kHh b txl4 ows:/s4p-fd 8zqkb0,z?

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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 r/,gytc;)2mgqc qc x- resonant frequency of 2qg/qyg,r mct)x;cc-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/xs-1vk2,o -e5(xcrq-w l ebtf2y xpp a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to 2xoyc-kr5w /x 2-vfpltb epq,1xse- (be 1000 Hz?

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