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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 magnetic flux kl s+y2fks6b-n0rm 5lb8zbt 5except

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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 stateszl *hb2lios+;io-u n 5 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 loopa9oxhz25 ye8n isq ,f:s of wire in a coil produces what kind of change on the xoa:hf2, qnies8y5z9 induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop oft:v-gk)wr 7 sq wire produces what kind of g: qvs 7t)rkw-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 vig/v *efdt97of change on the inducdi/ et7fvv*g9 ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic btqlb z* 8o28q ,o cmcpz9(au;bl;xz(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 vz75, ldl(fi0r*b+ jd hd ;uwtk1cki3induced current in a conductor will be that which tends to produce which of the followingk+(3dl7 c v ijdti*drfbw1kuz5;l,h 0 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 p kozav;)eqwxq), gw6xin (*bcd j:; 9horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (whe )obj v:;;, kwq(d6 x9cegian*qzpwx)n 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 mbzs d5 - ip7,ioq :q:f,trf1ubar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induceq7-s:15r m,ff b:pt d,z ouiiqs (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 ve /ex9(rw hsn(tctor points straight up. The magnetic field vanishes suddenly. (9hrxe/ nw(st When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vey )bs pep/x9 vu/d9tohs6z+; rctor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direyt)su h9z;+/d b69oe rx spvp/ction 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 where the magnetp; 8mba xog1a1ic 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 disappea1b p;mao g8a1xrs?

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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 e+,ibsgx crp;*c rl 5+wqvv55tver-increasing current northwcrqs+5,x +cl; i5*rbgt vvp5ward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enteri/(y;ly e .kf)gu/gxoyng first. As the north pole enters the wire, the induced current will be (as viewed fro fg.l/;kexg yy (uo)/ym 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 axis4fwiqzo:ks*-uanv)5 tto 1o* whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if toqza1v it :s k*tf5 4)now-*ouhe induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about anjhzg wv/(wp+ i9hn y69 axis whose direction can be varied. In a region where a uniform m6p(gwn j9 9 zyihv/hw+agnetic 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.p7j3fs 8m4jw,m e faxv,e l03o
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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 thavjw 5- t2nb:aat 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/s- m wty7+nlfdq(+x ryqm+ 0 nbxh+* sb-gh7p 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 east-west direction) is moved northward at g)fu -v5;y/rho(unqc constant velocity through a magnetic field that points straighqn;c (u5o uv/gy)fh r-t 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 a;.jgl .f9j.ae:j cjpx uche 9;ngular 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 transformsd7d57ozb9mohh .ie/c

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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 throughnvg zmj4/4,trk co*f* 60 revolutions each second. The frequency of t*z v 4,m/ngjot4*rfckhe $emf$ 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 used s pt4.k)fbnbs .g:xgs-x6mpj4ee;l1 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 that8msrp)avr,v,4i x2 5ahzuie)b k. up*

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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:n 2fiw,htfqkta;zzm,+h07, p zw v (v the primary coimt+z kz0i nv 2p f:zq,;h ,vtaw,w7(hfl 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 contaib 3w-nwdg (4aof*3cs wns more loops than the secondary coil then itdwgw n3bs4* ( w3fac-o 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 bg3gi .lf0k2kower 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 resonanlcom5d pkhzlg(a gdky-66: 9 /0fn0fvt 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 inductor3i 8/qgtj0u cz are connected in series to an ideal battery of constant terminal voltage. At the moment contact i3z0tc8i jg/u qs made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductu oibrnguln8g2-i 5c)ws;s 3;or 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 inductor iouuri;w)ng;sgb5l -8sn2ic 3 s

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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 resistance R is connected to a zzese /ll*/*jn $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conmcr7ocv1nn6+ c ro2j bu)gg6x zz:*a;nected 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 bfnreexc/b +6ey8k5 4v attery. The time constant for the ci/6 4rkvye+8b f5xcenercuit 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 indu-;;r wb1gtig 8zpl:lcctor are connected in series to a battery. The battery is suddenly removed-:lzb ;1r8lti wg;cg p from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sameeeb,;ce3un59kq i+wu- dpq u7 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 circuit, the (asbsx w4c k j:l:bo1,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 A vim,e13f,9 dfuvn f,paq -;he( brfm:C power supply. In this circuit, the current :-h,9e im v1aefnbdq ;urvfp3 ,fm,(f

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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 change2loj3exm1 x/ ym6a3b :a4fyzm ig 0sj1-6qczds by what factor when the frequency i2mag1/d4xjoy 0: - y a 1zm 6fmziljxcqe3b36ss 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 doubled, the i,un2 pb7gbd hspr*, ;onductive reactance of that indrgup b;d, 7p,so2 *nhbuctor

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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 indlx; .u/uwyf.v uctor approaches zero, the inductive reactance of .;y .fluwvxu/ 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 conne84dh o2c7uac8zcu7j ucted to an AC power supply. In this circuit, the curre7jc h zo74d8cu uc8ua2nt

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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 ch 8k1k)coao-z u3h-sfwj(m0cuanges by what factor when the frequency is trip c3(-k0u1mc h )kowz ua-so8jfled?

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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 capacitord;8zlhz3u ckvuggp:1 fkna2 6o.w 8e) approaches zero, the capacitive reacapl).1; ue:vgzw3duzo8f 8 knh k62gctance 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 inwa 7iab52 2f(6vym-y wi+ac5g w juof1/nlev+ductor and capacitor in a RLCil5fi w6 7 + /2 ao2a5wy+vnw1ej ybfcmu(v-ag 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 ih;-edi zh*s z)s 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 ofh685ur k4hfjw the circuit increases if R increases. When is this statementr84uk h w5fh6j 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. v , eytm+ pn 6bm1pv)2bc/(cqt The impedance of 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 impedance of the cp*l-s) rgte m(t at7aeiiz 5/4ircuit 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 capacitch ts2p.uz z-62tr7-lltx4;rr 5veab ance both double in an LRC series circuit, the resonant frequencyl. a2v462tltb 5 er;xsu cz-trr zh7p- 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 0( r :;fo:nu:pqy 5v mjjlqq/dby 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 circuit occuu 5;rpn 80hekc4pbbww a07cr,rs 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 unilogepmdrm+n,o 6 -+h6form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parall6,oompd+g 6h-+el nm rel.

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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 of 0.2dky)a /odli( l+qi3/ l0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetiadl y3dil)q(o+/i/k lc 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 unif;unmho 46on25/no(mt x ;rla:ua d9isorm magnetic field of 0.20 T. Find the magnetic flux through the loop when the planam 5nr9no 64/ an2utu:;m sohi xl;od(e 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 area4sjz+ g7oto vpq9*u 05-q cait of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes ve5n vet0 u)/vfrom $4.0 \times 10^{-5} \; Wb$ 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-brj296vo r9iuqbh4s turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of ru6qhj ivsb4b992r-o the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1oqva1;, - r+q6 yxusmz5 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 area -uey02q+0kmj +gw fk(qnxugz9v jx82 $0.20 \; m^{2}$ 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 ksmker e 4z;:s)o3dd. l q;1plhorizontally at a location where the downward component of the Earth's magneticmo3ezrls1s; k;d dke4)p q .:l 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 cobkyxw * .z;,ygnstant angular velocity of 2.0 rad/s about a vertical axis throug*w;zb.xky y,gh 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 cross-sectional areavgh3c( beh(j*;x;zto 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 olfd8.* 8h x(zvxjiir 7pmtj4/f wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 k t-fbdp0( yda+ 0 q39nixwjdm06x 4ihrectangular 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 field of 0.30 T, which is perpendicular to the axis of rotation, wa-i ft p0b49w0(x+k hyq3 60xmijddndhat 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 arkm* 5r- ibuju4kq,x9zv.n z5 xea $0.090 \; m^{2}$ 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 sisf0c77lxfzxo3i, b bu jnl0 sf ;u*17ample 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 the rotating coil ibc0joz; bu1 al7s0 n fl*7s7ix,uf3 xfs $100 \; cm^{2}$, 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 maximu6z g1sndu8yy zkjg b.k -fcl.imm8(29m $emf$ 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/( gug(bz ;nsq of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oper47tzzs(4 -cqfnydgg9oqf um .0 f0m:e ates on 120 V AC, and when-g0fs 94nd0 .y4ceft:(mq o 7gqzzfu m 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 resisv ++1anna tq(ftance 6.0 W is connected to a 24-V power supply. The operatin afvt1n(q+a+ ng current is 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 connectedl.a1w:ftx ; ee j*-me9t(i+oewsgm e9 to a 24-V power supply. The operating curreetej(;x1 *s+gim-9woe 9 :metawf e.lnt 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 resistanceqv*de ei bfy7.),:cer 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A atcfyv.b ):i qdere ,7*e 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 voltage of q 8xpt cg:+;f7 8ojxpu$120 \; V$ 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-turnw:p,)el/jp0vt/bqsbyf - 2 rf primary of a transformer causes 14 A to flow in the secondary. How many turnsfbs ) lpyrb q/:w-2j0evp,ft/ are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if tnrywrekggq,z t3pg1a) h (0+i:6fej *he 24-V secon1 :pwg k tf)3,+gnhra6jer(*0zqig eydary 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 and a 2000-turn sehhp:pl2; vq-z*rt 1eucondary coil. If the current in the se : *lqpz1h2v; uretp-hcondary 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. Assuminwd1,)n s fb-rgg 100% efficiency, how many amps at 24 V can flow sb1w,-nr fgd)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 neonez8ecaqyxz)*+2tk r/e9 k dv4 sign transformer provides 7500 V at 10.0 mA. The primary coilze zr/kt*yq9 x)2 +ve 8kaed4c 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 oirk/ih r 9y5i, a65mwzn its secondary cim akh96i iyrw, r/5z5oil. If 120 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 300,sd co8 0p1+cyqhnyo, turns on its secondary coil. If 120 V asdy+n 1oc,o8 ,yp cq0ht 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondaruto tx nt6so22/c;f.z y has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to b 2t cx;26/z. nosuottfe

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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 and9ba(k bl.y+ cx3mx -zk its secondary has 200 turns. If the input voltage to the primary is 10ak.(bky xc9- +mzbx 3l0 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 dns t3h-xg-v-bk,kd * turns and its secondary has 200 turns. If the power input to the primary is 100 W, we ckh,-xg-- db*kv3tns d an expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually o(4tbxj(q ki3+gih 9vstepped up to 4500 V by a transformer 3obhq 4igxtv+i9 k (j(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 is u9g uyu(32,zgkf+ dtfmsually stepped up to 4500 V by a transformer and transmitted f2 mut9+d ,zu3kgfg(ythrough 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.iu:8h tu4(+ zx qf6xqn The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. 4t6hfi: 8qzx ux uqn+( 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 of 0.60 W. A genev psk(0m 7dwn f;7m1imrator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, kn mw770vp(s fd1m;mi 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 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 (oh)u, 69b sudh.(t( kns oaoqottr +:total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hea(6(ts)t:k(.thsoud aqr9nuhb ,oo + oting 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 , *-)zjd )ye pjk+:spmsc, hidpower would be lost if the power were transmitted at +, c,ikm ds-):ezjy)jps*p hd 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 transmittefoe32 w lu-v,qd on a 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 not to exceed 0.qf3wlu-e 2ov, 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 qd* )ai5: bwotmuch energy is stored in the coil's magnetic fieldi)tw5a d oqb:*?

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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 inductor. What is t96wo;de jz4m1a jh(iqh -7 xaohis circuit' 1jw (;7h-i9 xjha 6oemq4dozas time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12-dkntcu39ou 2 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 intiyjslm 8 iz6jnzyc u9e26 /j:*o 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 resistance of tvt7+xlr-w2aq i h 5cvb+ 8aun7he labvw avtnqx7 ++-5rhi2c7ul a8 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 12 b. ev1q*sjj(f0-V ac power supply. What is the peak current throv s*j1(e .fjbqugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power diss.y 6mycd). rjdipated i.d 6dc.r jyy)mn 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 relg6/f *s;rmzbv (jsywco n,0, sistor 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 re/k. vk. d1zgwy.9 7az:ag wnvgsistor 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 rk. bv;qht;hd*c 2) hydesistor 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 inducto4* : jmnw ll -uej/w1he)0vqywr 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 coi(;91g e )pgbyi-slpxpl 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 h ptyg(6m,8 g*vx u9pvcoil 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 necess 7/h7g0j vnxh0)4z fpevrb el3ary for 157 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 inductor when 120 V .obuy jdsqpl; d3.n+7AC at a frequency of 20 kHz is d 3syuq .dn+;7lpjo b.applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil by rjweqp2tm 6/bxk2 )3y, lq;l41tchdue 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-mF capapn h* -ben6cr6h c8s)tcitor 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 capaci ozdnulc6j/z.b-()oative reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does tn3nn gw fdt:wa5r7: )a 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 reactance of a 0.010-mF capacitort ug(0ysp 4;i)hy fc8u4v-7oqvj q; dz be 100 Wd jvutu);ovs h q04fipcg 8(z4q;-yy7?

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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 10r u 9h998fmrcb00 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 se.oivp.z y 1bo :v(/,seleg.mc ries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0.e.mg /,1eciv s:o vbl(yp. oz 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-;9fc0vze;axm8+p o dnmH coil, and 1.0-ean;;dmo fc89v zx+p0 mF capacitor 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 recx zk*o3b,l ed9op1 :esistor, 20-mH coil, and 1.0-mF capacitor are connected idl9b3e,okzp: 1o c*exn 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 wib(p e*u.x cs7gth a 20-mH inductor, what is the impedance sg uxp(7b.c*eat 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 wi+lti xo.1p t fxk47zg(th a 20-mH inductor, what is the phas 7f4(+1kgxtx izt lpo.e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a seric0tgjq.nnp 3h714li;6z zt ties circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanpjg3z tlt7h;.z6t 0n1 ni iq4cce 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,gfyjc/bu d0 t2r3e0j0oay:y and 15-mH coil to get a total impjy3 ,abd/ort fyg:c2 0euy 0j0edance 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 n 1i)vnj )t fnvm5( muaqo.9;vinductor at 5000 Hz for a total impedance of 40000un).(m ;avi nvvmj5)1t9q ofn 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 r .c: )sab6vij 6l/oiu*ghp* ilesistor at 1.0-MHz for a total impedance of 150 kW?6v/j )llopubh*g*s :ci iai.6

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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-i*-m;m8e 9wb3lb5zksos dq c capacitor. What is the impedance at 1000l - -*9imqs 35ws;8ebzbkocmd 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 xn 9 rx69zj d2fdbm*zujov 5xq-;e0, jin series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4 xu2j0jjf59n d q6;eo m-9x bxdvrz,z*5 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phass.nccye lnzd90 wm1l* *zm s3.e n *mnyc.s1wcdlz0s*me 39.z langle 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 neegnrca.,sq7 7 xded in series with a 30-W resistor at 1.0 kHz for a total imprc,qgs ax 77n.edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wo3xut 8w:hk- vhat is the phase a-w: xouk 3hvt8ngle?

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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 r/x), 7nncnqyid*tx/ gesistor, 20-mH coil, and 1.0-m*xxdnn ,yc) 7/ti/qng F capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0;w5(el61hy-/ vlhjh) r pkqtl-mF capacitor, and a 0.350-H inductor. The circuithr15/wejyv6kqh lpth- );l (l 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 capacit np,co(v-wsy*+e yf- wive reactance 30 W, and an inductor of inductive reactance 30 W are connec+ ne *wwp -yys,(-cvfoted in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W res 8jf0 7irhvdc40f9w rgistor, a 10 ffr8ri 470g9j0dhcwv -mF capacitor, 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 serr;06jso zqo( sies with a 500-W resistor for a phase angle ofj0sosrq(o 6 z; $40^{\circ}$ 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 =/ lnkr(: y (lbvgq*rcl2 p85i(m y(xcy 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven iniyn8m2 c:by5l p (rql rgl(*xk(cy/ (v 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,6ahw8 (toyaf4 15.0 W inducto h(64 afyw8ative 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 circuit is r;)y wmrhi: lw(m qep s5k1x62$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 3opmmf1) jf **s0 W. What is the power factor?m*1p) fjomf*s

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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 50-W re-4(kv- 3xduf3b umtjisistor, a 10-mF capacitor, and a 0.45-H inductor, when conne-k xub t3fj-d43m uvi(cted to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.48kg/eqv1uw4o/ ( p bnqvh:bxe1vyy 00-mF capacitor and a 15-mH coil in series?yw 41xbk vg b:4eu/(8e/py ohv1nq 0qv

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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 capacitor for a re2ah -l j :ew,x*j csdzsqn13g2g02qpn sonant frequency of 10 kHz?w*nqds0g23pg eh1n x2j,sz2laj- c:q

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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 frequrxx-8hdp m.l:m :d8xx-ph.rlency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a kmz9:hup9 j; o40-mH coil if the resonant frequency of the circuit is to be: kmpuzj9 o;h9 1000 Hz?

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