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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 unitxm7ggyt7):w3 : dosens 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 statpgz :v1upfe z0qcv 9.+nf 1j087y tksbvfog97es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces sntnxj58 ha/86.rct v sg1o v8what kind of change on the in t8 ahsx6vortng8 /.81nsjv5cduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whc;;pdc*:2w6u y5fpznlyj o ; +apu:qhat kind of change on ppf:q uhwy;c5u; ;aoy nj+d26c:*p lzthe 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 -a:ruk,i fqrj ij/+*z of a loop of wire produces what kind of change on the inducediki r-: ,jz/f +rjau*q $emf$, 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 magwc bfsp1+82qwdh)(kznetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced 7 ;grmlhg s0+gy)hc1y current in a conductor will be that which tends to produce which of the following)cly1 s7gggh+ry0 hm; 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 horizont 0rb6oxm9szm5 s(;qw2mk+ 6pkzl q.xlal table. A bar magnet is held above its center with its north pole pointing down. Tr q p6x swl(.;6szmlkm9zm+x k0q ob25he 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 tablyu3s pzxp1 rd)7uk21fs n jkkf.v8y79e. A bar magnet is held above its center with its north pole pointing down, and released. As it approac k 1zxp f8k s173 ).rfnj9vpyuyu72ksdhes 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 field vector pkw 7/ o+af,9utb s1dmzoints straight up. The magnw,1kz/7 b9du astofm+etic 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 ikfe ). azyccwa 5b )aws(;/ayd+g2o0j n a region where the magnetic field vector points straight up. The magnetic field sb +2 ad0j; ac.y/y()f ckawswao)zg e5uddenly grows stronger. When viewed from above, 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 table top inrecb* 4;tki 0( 9asp) 4uavahf a region where the magnetic field poaau*9iekf;4vh4 rbacp( s t 0)ints 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 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 n te(3iw3tceil - m:l9a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the cw-ln9 it( e:t3 me3litable, 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 with the0o-67cmvx mytjk2 j)v north pole entering first. As the )6vv2m xyk-ojcj0tm 7 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 angular bav9* l2rpm mt +5a9qr)rz)ntspeed about an axis whose direction can be varied. In a region where a unifor 9b59lvam)2*zr)+prtm qra ntm 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 rotated a 2sq,17 jrscwzt constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriess,7jcz w2rq 1ntation 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.l;iaeflz7) 7a
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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 thaj+ 7im-gv7 ia;+byfccvm-iz9p) l xd0t 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 magneti )l(i k l4l517lghavb)o9hs tgc 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 east-west dik+ od ynn, gi2.op5e-zrection) is moved northward at constant velocity through a magnetic field that points s 5ozp-,ng +ke2 yinod.traight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocit uyd )0+2tdmvmy $\omega$ 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 t+ )t1rp(mi uvtransforms

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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 3y8 t 5svlb hm4wc,bn;through 60 revolutions each second. The frequency of twvbcln3 5,ymb;h 4st 8he $emf$ 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 dhd(nic c h6+f tvow wb7c3;53xevice 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 r1mlf* +*0s*ys atcbkthat

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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 primayhuw f wng2e2v7vrf;yg/8 0 (pry coin;y8gug(02hfwp ry7v2vfwe / l then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the i9l jcu;e/s9 viz 9x5b bm(ih-m rse32secondary coil thec3r9ibmmeb2u5ls;ji hix-z99 s/ ( ve 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 povb gxeq s4)1 s7;dy 79zbgl:avwer 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 cix eitfo9 jlk 13,z0al4rcuit,

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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.pu,k og 2ejnw,n ir*9 series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrogupirn*jwe 2.,ko9n ,ss the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of const:)upjk (lgw1bw i7*pxzz b ny(;u4l5yant terminal voltage. At the momegy ybpljzuz:b(4 5)l k1xpwn(wui*;7nt 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 induc /db 4u3ek bzmrjj91y6tance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with in- ;p)zhc6 y9/tux. im8yevo foductance 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 bar6rs8vvdx0px0 i* wb(ttery. The time constant for the circuit represents the time required for the current to sri0vdwp *6(b0r 8xxvreach

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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. The bv5apwx1fr o xb9f-h 4r a2zu7+c,gkd ,attery is suddenly removed from the circuit. The time constant for of the circuit represents ordg7hvw1 54abxf,-+ u2x9p zcr ,k fathe 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 unitsc xi*0he/:ef*wl9b cx l9ws -z except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currel . mzw: ysba483wfj36jhdyf7nt

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this v9*lii z4tg;b2i ug8ccircuit, the currentg 9zgl4;ti2ci*ivb 8 u

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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 by what factor when t/de8ajaj lt. w2m2;sxdq ut91he frequency is tr8daldwe 9 1/a2 2j. tmutxs;qjipled?

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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 indl ox nq-rx-*s0uctor is doubled, the inductive reactance ofo0s- xq*nlx-r 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 across an inductorst6. yqb zd0s pzt);d+ approaches zero, the inductive reactance of that coil+ )sz pztq60dy;std.b

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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. -zbf+8z 9 isi wej9vc8 In this circuit, the curreniiw e9bvfsz -988j+czt

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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 0(+gmlz wag5g when the frequency is tripleg maw0g(lg+ 5zd?

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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 approache1m l7r wb3rxv+s zero, the capacitivlw1v3 x7bm rr+e 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 voltages of the in5anv;rp bqp6 7ductor and capacitor in a RLC seriea6b57 vrnpqp ;s 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 RLy o kajuj.(9z6fi6br/C 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 incs2o/ pb5 xx**yfb1do gve61hmreases if R increases. When is this/5 *sxg1mbhx *bey p1f6d2v oo 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 the circuit increji4 n4dck-gdn e9qm5 a*nmo2 -ases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases ifzkjokv2m+ j): /jvv7z $X_C$ 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 ccwx/-t oe;lkf/up) l-(j5rs mircuit, the resonanksxt;o /cje5m(pl w f--lru/ )t frequency 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 applied voltage. At , 43 u*be4pcrsia o.q/hcj8lbresonance,

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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 RLCol y hn7h56eu/ circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mag/u4 3pll (28vrk 43c 9ogsrvsumplc k+netic field of 0.20 T. Find the magnetic flux through the loop when the plamlslv cr3uupg+9vcr 38 k k24(p4slo/ne 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 magnet: 9zg)f6q jp x9kx7bajic field of 0.20 T. Find the magnetic flux through the loop when the plane 7jzaj)9: f9 6kxpgb xqof 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 fs iss)w+y2 wgxm2 0:xyds *yvc*q;:t nield of 0.20 T. Find the magnetic flux through the lo2sx0x dtqysw )* :2*gcy:s+;m wnivy sop 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 om+pcu lz)qbr/dkp(a/cm vj)28 s 5j4q f an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes yrpj xx ;0hvh*3j zt(: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 turn+rxz i: bip h ulqnb9rt,3z(dtr8;r,4s 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 unifo94 ir,:z bhxizl; tr(tqr,d rb+pu3n8rmly 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 area of c wc vn7j(5b.j$0.40 \; m^{2}$ 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 ad54x4 0r ke1ed gfgz/9vk2fxarea $0.20 \; m^{2}$ 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 hor 3d5)zzfrn*dva0ng, aizontally at a location where the downward z)*na,z0nv g3a5drd fcomponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular 91m)o - wicfmvp1q7d np, msa.velocity of 2.0 rad/s about a vertical axis through one of its ends whivcdps. a91p,fnqw1mm oi-)m7le 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-sectional araa/d o0itq,,l gk0*s rea 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 1 o:uheyb908j egueye 2v85. cu00 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 r . -nsppz ukajmc o:h.7.88abcectangular 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 side. If the loop rotates in a uniform magnetic c.j7p8zs- . acnub:h 8a.pokm 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 ie,6*xms .tlfvw/b5dt,w q g; 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to cons9iz93 4w )7ium;z;h ohvatw1u,1coehhw ck5btruct a simple AC generator with an output of 12 V bhoi ;wwkt1u3) awze9,h uv571c; 94hcoim hz maximum when 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 with a maximum h1sweqkz4nq d6tk qu)r0 8q 21$emf$ 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 operate6kl nm-b5y 0kcs 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 operates on 1)e jffv tv2 k8 ip+ymf282irh(20 V AC, andvjh fk2mi f2)epifv+8t 8y2(r when 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 isr;4x i, danlr6 connected to a 24-V power supply. The operating current isxir 46lnr;,a d 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 res 5f wc4t joe/gqj*y48xistance 6.0 W is connected to a 24-V power supply. The operating currentg yc4qj8f/tej* x w5o4 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+kd)a(hrteaz , povf42 pi mcs +;54nx a 24-V power supply. The opxe 4ack+,rnvhs p+iz4m2p 5dt)f(;oaerating current 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 primci2ze m3 e9uzrvgvs3 -3r+mt0ary 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-ture+qt 9yh;k m:rn primary of a transformer causes 14 A to flow in the secondary. How many turns are in the seco:kq;ym+9 ht rendary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, hoydz (p .0sgvtn.ms-) bw many turns are necessary in a 110-V primary if the 24-V seco v )sm..s0pz(nt y-dgbndary 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-turn primary coil -:mkh yq 8h t1h:z*x/mntj d6band a 2000-turn secondary coil. If the current in the secy:ktd/hj h:tz 1mh6 nmq-8x*bondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% epvbk; h9m.j4*a6os cv8 oi0rlm,m spxj61gk, fficiency, how many amps at 24 V can flow in the second .l ;s 0pkarc* gov,16jjm,mi8 mo649sbhvxkpary?

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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 g-m9xqg oab 25r1xfo me*,l.vneon sign transformer provides 7500 V at 10.0 mA. The primar b.5g-2 *1m,mag9x l ovxfeoqry coil operates on 120 V. 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 primary coil and 300 turns on if5ihb8gznft ;:po: vmftm469ts secondary coil. If 120 V at 2.0 A 6 zh9np tg :mv48fmfo:i;ft b5is 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 turnswk pg-,kghi- :ub5ow+ on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied + wgikp hwo :,b-ug5k-to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haie8v)zs .n.r5r xb(oas 200 turns. If t)seo.(8zb rn ri5 .xavhe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 ;dk0 jb+mutwf sa m2a)4h+qu( turns and its secondary has 200 turns. If the input voltage to the primary0t (qafa+wjmus2 u dm)k;+ 4hb is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 3w(pv o,qnbx65ad 8xuw ;;sl i100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictpbw(nw653,sil u x;;xvo q8a dional 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 9 p7xe5 haom :hh+/gdtA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and ae/p hgmxd:t75+hh o9transmitted 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. Th oh/eek.:bve* e voltage is usually stepped up to 4500 V by a trans/bveh k:o e.e*former and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volta/gx4l-x1zq ph (p sqt5ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the peqz1t/4hp xl q5-( psxgrcentage 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 of 0.60 W. A ge.k vb yncr/e k-3tc.w2nerator 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 lost3-r2vyc/wk.e . nbckt 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 oqbq7lr5yb m 4;z46ket f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heaty6;rzk7 be 4lqm5qbt4ing of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woubkju/ 3:klj g(qq*th-ld be lost if the power were transmitted at 30-: j*jq(ku3khtl /q gb00 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 s0dbmi zxl 9:5qqh 5)sA. It is to be transmitted on a line with resistance of 0.60 W. To wq ):sl b05mzxd5q9s ihhat voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energh h; s a9vzeu/)ye3zi;y is stored in the coil's magneti9zheh ;/zsuiya3 )ev;c 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 as k0+ 2(sfep e yo1/b,/1wymkzbaj vg)n 18-H inductor. What is this circuit's t g/y p2z/k wm yefk+( b)b1s1joa,s0veime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12 kieh9dg:yonb-h 3 e5.0 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 gt6.n96 kk7ce6q/uhf ied q*npeak 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. Whp ( mk-m/+;evc 1jefbdv8)mimat is the resistance of the lacmdmm 1/;e)8 vjv+bim-epfk(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 p6: nykzh.6enb eak current throhnk: ney z6b.6ugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power su*wi/vh: r 4kzg3meiaim,*yv;pply. What is the power dissipated in the resi iar 3y*ev,: i4zg vkw/*m;himstor?

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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 resist4flp 92wg83)1rhc dz 3 ummrzbor 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 resistozc;f 7 yd,;aldr is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rdr-s6jf-v ( nvhvu,a9w( g3sjesistor 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-mHtm6zioe1*r64k;f r i+4rm mgl5 ro-ab 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-md2 zmny/:sq8 oH 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 c+ xofki z8d(m7q5s p7joil 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 15/0- rsfx9oemcd h5w05gj / twdq-uf)q7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH ic/4 y )0hn9hsh),zzgfwex 0qd nductor when 120 V AC at a frequency of 20 kHz is applied th gy 90nh4)he,0 zqf/zcsdx w)o 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/qm)vini -r )m 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-mF -diqgy2ob pbf6 : ):lmcapacitor 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 kHrtmzl1+8wqo 1z?

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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 1 5,mpzao,.jb z0o2yka200 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 ejq5vj*k1fa 90ybpg/ of a 0.010-mF capacitor be 100 W?51 y/p b gjkvefj9a0*q

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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 5.0 V?q z5mibu*dl0 *j*y9w,lx4sb 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 resis.uuk6 5y9l-a1zhk c obtance, 15.0 W inductive reactance,uc.65ak-9b uhy loz1k 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 resistor3ol, g : o,7aeprujqk1, 20-mH coil, and 1.0-mF capacitor a,3krq:goe pl,uo7a1 jre 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 resistor, 20-meg/qj;o7/k hmH coil, and 1.0-mF capacitor are connected in serie qh/oj mgk/;7es?

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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, wha*.nd 8uq 8,xv6ov yhw9(mlcek t is the impedance atm 9c(6hvx e 8lq8vuny. ,d*wko 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is te:lyinr16i ,j8ndbg 6he phase angle at 1000 6bgr, n:nd8yiij 1 6leHz?

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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,/j ;y nc0d-1gisk fis with a 20-mH coil and 1.0-mF capacitor for a total impedance -/ iy c;dnks,1fgij0s 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 r4b/:bw:js yy+dhb2jand 15-mH coil to get a total impedance of 110 w:d:/sjbj24bbh yy + rW 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. q6 qd 0 ssa*;k6jw xhqza:wz3o..ols-mH inductor at 5000 Hz for a total impedance o jz:qxk66.;l.wz0sh a.osd*qw 3asoqf 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+rx1zp1/i 3xpfv u,z w at 1.0-MHz for a tox+,w/ xu1zpfi1zrp3 vtal 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 c92lxx ty4n h:h 7/dvfs0y3uqfapacitor. What is the impedance at 10:9fvxh4/yynt s q hduf20l73x00 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 *s* pca/r7-fwzkds +6 xc*oca a 10-mF capacitor at 1.0 kHz for a total impedance z/opk*dscc ar7s-a*x w6* fc+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 /p/jlyv.ohtl* w9q8i8)) ax r2z ponha 10-mF capacitor at 1.0 kHz for a phase anglt /n 9ioo pj82apqlvh xh*8.l/)wr)zy e 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 kHzu-nd6(*gac4skxxpty nf 0+t . for a total impedance of 45ap(cyn u t.sd 0xgn4+ x*fk6t- 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 ay+zm -4 fmw-zst 120 Hz. What is the phase a sm zy+wz-f-m4ngle?

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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, 20-mH coil, and 1.bsgz) 8frlm-h , agiyfv,3w,60-mF capacitor are connectey h8 i6, srb,,3-wl)fvamggzfd 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 consisjrz6(g.e zk;c9ewo . cts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cg.z6;eez rjc ko9w( .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 capacitiveojo2 ie z yquh0,*iazn u,1m2se3j6(q reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz p*u1 qh,in362 mj0s ijzz,qa(e2uoeoy ower 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-xtcq ltg e48rmzvw-mn58; w2/W resistor, a 10-mF capacitor, and a 0.45-H ilxv mwq/r e2- gnzcmt ;85t84wnductor, 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 resistor for a phase angle oe.aqegwo+-2z 6jrzz8m;rd d.++ gine.no+6ei+g2e8ezj- d;+aq g mrwrdzz.f $40^{\circ}$ 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 Rvn6 i, cgf5 :)hz+eseep/mbz- = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in-+,v g c pe:e/zs 6ezn5mbifh) 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 with 12.0 W resistance, 15od36e/2ueu -ww4u*u w.7 dodvq4 j pyy.0 W inductivu3ue4 qwudjd-uyov6 y/ p*.2owew 7d4e reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circ99 o)wkg) lyjcuit 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 re p)y7bdy9fa y;(v wsp d:jd7-ssistance of 30 W. What is the pos 7 9b(-7d:swjafdp yv)dy;yp wer 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 containing a t mg,n)5mhkh /43jitr50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ti3tghmr n,) j/ 5t4mkho 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-aocks1 /s ze30mF capacitor and a 15-mH coil in series?cz/ke 3 s1s0oa

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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 series32ojq lbut(9 c with a 4.7-mF capacitor for a resonant frequency of 10 kHjbl9 2(3o uqctz?

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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 frequk* :o ftx2z;kjency of * ofx2:jk;tkz 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 wiz+epnw2r4(g d7 wnvj49d .jeyhzs 1m,th a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?47ejnw9 hy,zw (mpn1sj .2+d 4dgzrve

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