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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 ma e( qvm k8ld8z,1jpkshg tj-;*gnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that iiaf - i8nthmujf*d8zv4671u 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 what kin)zp7q3 hbhp9i/zg :zld of change on the induc7 9zih3p /zghqlzb)p:ed $emf$, 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 throovzr x9 8 y7lt .g)0e)ax7gpr4td6luaugh a loop of wire produces what px0 dxvog76.gze)tlt7 ya98rl r) a4u kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of changifao/-u9) h9nr t0 cnpe on the indu-nf/pu )9chinot 9r0 aced $emf$, 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 field ant d:6n8 lke2gd $emf$ 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 directi gv e4v3a,k1d oovj4s6on of an induced current in a conductor will be that which tends to produce which of the following effeo4v16 ds v,j3v gaeo4kcts?

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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 horizo 4e3)k tocioz.ntal table. A bar magnet is held above its center with its north pole pointikeicot4 3 o)z.ng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tabl 6ptqx cwi vas5r0jo8.,mk80 le. A bar magnet is held above its centerl6w8c, q8 vs05pt 0oriakx. mj with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magne(2b hgdlnx f-asa h;u(bz e*1m8q78jcco,dn ;tic field vector points straight up. The magnetic fiegb1e7aha x- s qd2c;8hbfo,m(ju czd* nn;(8lld vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic flgb9 w3yn:i3 zield vector poiny:3gbwi9 3zlnts 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 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 6s:t rzyvu3, gmagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is thet:y u,r6z 3sgv 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 alswjr r7ux/1 - horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithe1ljrwxu/ rs7-r 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 loopy,+azzm3hhh t ; 8h2ct of wire with the north pole entering first. As the north pole enters the wire, zt,yht +za2c;38hh h mthe 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 axi6xskjb* p)wb93gn(qs i1xoe3 2m+p di s whose direction can be varied. In a regxx3gq32 p6bj*dsmik nob1 s)ei(9pw+ ion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 6vtri4hi(px ae5le 23/ pyi1qis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiel ep1ei/y6 (45qtiphvixrl a 23d 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.ma8 jnb3uva-hags * nt1mm8,;
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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 tha n 6a bbnh wu2m pw:tb1(iz/c9ae/..mat 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 vp:b sbq98m f vju:h;1magnetic 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 ob)urojf -r;9zmp x64at constant velocity through a magnetic field that points straight down. Make a statement concerning the potembuzp 9 4jf-6r) o;rxontial 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 consttin 0fc,o +0sxant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforms)bra6z;. nk xs

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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 eacspjji*xds;vwr0 ;r*;7i lz3: .nwvva h second. The frequency of tvzd*v0; ir r: *iwslas3p.;7j;vnwjxhe $emf$ 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 devd:pk26z8et kvg. no .nice 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 m38gwxo 3a9g8eh*wau 2e6 *r htswq)athat

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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 thn r(ajp6 8qet: 04xxfze primary coil then it is xnxz(48r a q6te 0j:fpa

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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 secondajh:77tfgm2 d0wny)xbzj+( ulry coil then it xj0n77 ( bzm2l hy)juwgdtf+: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 p0vbi n;sj5tk 8-frw2 oower 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 cirz)ppgm1c 2sn s-qic2 +cuit,

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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 bnox0g4v/+ mcts-1h qan ideal battery of constant terminal1+v- scg4t/xm0n hoq b voltage. At the moment contact is 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 inductor are c7brcf0+ug 7ys7y (bfl )xrw 1xonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bat7u7 l+f b7bg w(yxr syrx)01cftery, 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 indga*fi3* zw 0zn0db.h cuctance 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 indu xcj1u,aa ka-t -h7le2ctance 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 batf91u 4z0b x: p pfnvz5qkd6ay +5gnsv)tery. The time constann v qpzufs)a0:5+b k9z df6x4y1pg5nvt for the circuit 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 conne64c+ ddefpz7+n )zvmy0 cv5ctcted in series to a battery. The battery is suddenly removed from the circuit. Thecpe7c5fvcnd0tz 4zyd+ vm6)+ time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units t- (sm9/g6sag,keirj9 p2i3w pabr 4cexcept:

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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. Ongv7h,l pb9dfg)dsd 72 yugb5zi ;kp/5 this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit-jw txx4)a ro8, the curren 84wtrxxj)o a-t

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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 o9wivuz .v* f:what factor when the frequency is.vz9o*fv w :iu 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 acvswc56*5)qa xa)gmvrq,se k 7 ross an inductor is doubled, the inductive reactance of that marvka6*),c qsgeqx 75 v)5swinductor

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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 ic:lnnq m-.loi*y1ubpv;c/97 2 f zsixsm2 kp8nductor approaches zero, the inductx/*8;qsn spmui2fbzpn:. i71 - lcmvok c9ly2ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, uvo( 8.rkwnf 5 heh9+4l245erj g zdfythe currenvhwfo 5 h9ku4gf4r+eer zny528d j.l(t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the fi au5h;8 lw3g vo sb63ed,fk 05twca4zrequency is tripl va3z8a5 sh cw,;bue4g t w6dfi3ko05led?

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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 voltageqqou 6r k,emb,2v,9 cn across a capacitor approaches zero, the capacitive reactance of tha qq ock,urb,n2 e,9v6mt 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 indu u4y+9o8sfbz yctor and capacitor in a RLC series circuit u49+zfo byy8s?

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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 cz ;ars2 9-li /o8p4vf2tn0omxvjnd cymi2:i5ircuit 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 in* wid(y*6ya:4fhs ov0bs +tsxcreases if R increases. Whenwv odt60 xyha*b:ss*4s(yi+f is this 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 w.vmgbsh./oa+ 1 w5a bincreases 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. ekj 3xf62 ajqb2)p .ip The impedance 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 circcdn te+:p t0e1uit, the resonant: cet+ted01p n 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 Acg xpswj rtw;bg7(9,9C 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 ocns j6sx 2trp7 qejh.*;curs 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 rotxkwbez 2(g*hu;7 wox565 zximfs. nx.ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti*zx o xkxex mfg6sw; .i(527zhw.5 ubnc 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 ru.-ef;x2z9atpd b 0 ibmu ,4 j;vng7slotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whv9u 0; dsb zigx- nt.a4;bjp m2u7f,leen 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 iw:vj e swww7+9(l. mgxn a uniform 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 at an ang7+wmx w9lwwj(:g esv.le 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 from 1vw 8)v iea8q5bzve6x $1.0 \; m^{2}$ 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 chd3zqukj7q6 + vanges 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 frame2vn; cn1 htafoewn(4y dk *f;: with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If theo4enfcnayt(* f;d v:h1 ;n2 kw field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ar np/ /*fq5 )ln+a3 js3xowtdvnea 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 ar2bvi, trf*9 jpea $0.20 \; m^{2}$ 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 fliez5hvue t9l( f,s horizontally at a location where the downward component of tz eu,5v( f9thlhe 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 constanrx16 yapy/3y2ozdfif)+ uj .c t angular velocity of 2.0 rad/s about a vertical axis through one of its ends.12idy+jr/ oyz6cx3 f)f p ayu 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 xr w m64ns8 + f6wgww,n-1/hlv2szytr,k ,jwqloops 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 of 100 turns of w)r u;g/ry rdx8w,en 8cire 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 recth7r5yo(l:( qjxs l 7w5r q/ausangular 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 7j r5qs:h57 la yrxus((wqo l/uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of pyfms; k56jh9 ie0( t4sgg*x swire 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 AC gemwd0h v ;bqbe s06qa97nerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ivdmhb6q79 eqw a0 0;sbf 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 ge8gulrhz +vr+2 nerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatizo-3m43 t8 s7 rifpl1knuywk, hl9f+ es 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 resi7(u*ms fd2 ucpstance of 6.00 W. The motor operates on 120 V AC, and when running at fullusmcfu *27 (dp 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 resistanc8-8x5pld3+klxy j f;yjq fb jwzkefd8r )7+3ze 6.0 W is connected to a 24-V power supply. The operatllx5)dw 3;7r fjp+x fjd z-+ z88f3k eqkyjb8ying 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 connected to a 24-V power supply. ,j c.t-pr r7qeThe operating c7 jqrc,ret-. purrent 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 iss5 fuh.d; qt c3i:qay1 connected to a 24-V power supply. The operating curf 5 i1uqdhat:sc3yq;.rent 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,+-: nmb*uipq2i t ikb 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 -0byei s02ekqq85 vau the secondary. How many tur qkui2080yeqsba- 5e vns 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 0d *nfzac,ms)inyb56 primary if the 24-V secondary has 100 turns?yizb *c 0d)mn6fa,n s5

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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 coatdrm7 k ;0rgq):j 60,j omopcil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is t; oqjap6do7k)0 tm cj,rmgr :0he 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% efficiency:9iv+ qqyx;k3hp ras3yx79m6oc 7o qp, how many amps at 24 V canx93yxr6 7 ;osap9impo:y c37 qk+qhqv flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer przq)r y4f m(;cbk mbbwq8 jt55*ovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pr 5qcfqj)trm*45zbbb;kwm y(8imary 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 any-h ta*ya4dl9x)onh hjn2 5js m*k0.vd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pr o)5* vmlkndx0j-naah24 sh ytj*h.y9imary, 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 tz; vac; 7qrc7jurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?7; zq;avj r7cc

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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 tu)l vue4fpi-/srns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the p4-i)ves /flu 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 :ml,dkmq 9h4 iq vy-y;100 turns and its secondary has 200 turns. If the input :m l-;h9kdvy m4 ,yqqivoltage to the primary 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 100 turns and its secondary has 200 turns. Ifk4lq rnfcgru +vvv:k3l 58)t0 the power input to the prim8g0k 5+rk)nru:v vvlcqlf34t ary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u6f2ms7 ixkn :/zdme3ysually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1/ 6x7yk3m n:f2zemsd i.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 Vk1*i-yba /owl*b0 .5gizdb zib-0p vi . The voltage is usually stepped up to 4500 V by a transformer and transmittwoab0bb il*bp z-iiy *v/g .d5-kz10ied 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 voltagam8nw 32wa9ymx t)m -ue is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in wy8u9-t2 )manw a3xmmthe 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 w 5)ng4zlbc x80.60 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 step4bn ) g8xczw5lped 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 total resistan5 -3zdgyb o9 n2onpk2nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due tkozo- 25npny 2bg 9dn3o 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 transmitted down a 6-W line at 1000 V. How much less ur k+7rcr,il/+ qsy9rouw(* jpower would be lost if the power were transmitted at 7*j(/, +ru+crolqk wiuy9rrs 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 gener x(d04s*y6su /x-j ,iruwvic7blg d x8ator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 Wdw,id l04/- c v(iujyx87x rs *b6sugx. To what 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 mu 3vvcz v9 a1tg2sq::0l5tmzvmch energy is stored in the coil's magne5 0v3 l9t czv:z1mgs:vmta2 qvtic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induct8sq8jx 0e4sqz .y va/dor. What is this circuit's qs0/84y d xv.qejas8 ztime 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 circuihn1dstz/xex8 m 95f8b6 bo*zet where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pea)9iw-+exi*zn vq/),axv0 pcf/ w zo;b yngo8rk 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 outlecl*lndz :b9z0 ntf 1g;t. What is the resistance of the lalf 0dc19tgzzn :n;l* bmp?

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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 0igco8 eo dfz 3gaq(4)power supply. What is the peak current through the resisf8q0d4c o)og( i3eag ztor?

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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 p97c j-5kw)9,codex r5lwo ckpower dissipatolk,j w5edo)7c pxwc- 9 rkc59ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50yipr:xc+ 1wh 3-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 50p.gr5 ttye2e j 3bb.a)-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re/ s +qw+ ; ppvxkce*uhj;;lvf.sistor 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 reactance7x(qrjsqpx *96j nucee74 3vt of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2 hkqqep**ghn)(x85 t b.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 14.0 W of inductive reactancp 7/ .hpt z;csk9iol/ee?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n7+c a8lms,h rgecessary 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:0,i o:pe fkz vte/je6 AC at a frequency of 20 kHz is applj ek0o v:fpzt: e/ie,6ied 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 throo .az1(;of9d ;tp-yopqm+l gjugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reac4a4gdr5p bp fmo4g,rmiw:vw8h +mi,)tance 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 capaciu4/liy abjgi) fp5xx25( vt(qtive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a r*x-2b+ *jatk p4d7mxuq k xl8seactance 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 capacitor b+q5 dvv13 3 jexxehem7e 100 Wvq m j1hxe3eev75x 3+d?

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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 t; j7ecvlbxprsp, (o7f 7 iz xv2f5 +g6gydv75fhrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuyjy3vopuc)9 m(: se cf+ i9f7tit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W (cs3p9uy) etfoycivjm7 +9:f 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-mH coil, 6bnjuq4 .c.r9vxh3:evzbm g+8gl7m j and 1.0-mF capacito eqvg.j9 cm8 +uh7b v6nbg.x:3l4rjzmr 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 ;iy hlkj/:j i0100-W resistor, 20-mH coil, and 1.0-mF capacito0k/i; h l:ijjyr are connected 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- k dbq lalu4xxjhx /kp*s685) rl,5p.smH inductor, what is the impe4*kxx68l )j x,hakpp 5rql./s5dus bldance at 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 wit uxo+((( 9k-amfvpvbqh a 20-mH inductor, what is the phase angle a+vuk( qopvb-9m( x(aft 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit witgaa)j(gsg )yjg - )k9wh a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzjgkwg )j-(9 yasg) ga)?

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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 capa g8snt8 -6izmkcitances is needed in series with a 100-W resistor and 15-mH coil to get a total i-tn 86z k8gsmimpedance 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 withld(j3yxdt-+o o i-p0 l a 450-mH inductor at 5000 Hz for a total impedance of 40000odp(-3olj-+itxd 0 yl 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 wpev,q/jp g w98: ox(ubl2zryc-b4b -cith a 100-kW resistor at 1.0-MHz for a total imp-lczuoyjr8x-: vpbew9b(,42q cg/bp edance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Wh;tk1f aum2)htgj7chj58os( c at is the impeda 2t c(7kgmth;)joh51au jcf8snce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at whgkha+lt muc 5bd)1i7gzwf2.:,)sz 1.0 kHz for a total impe h),1i2uwz:tzg akcb. wmgdfh) +5 ls7dance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ddj-*h;lm r .3g3dlpgcapacitor at 1.0 kHz for a phas3j.l3 g- mdd*pg;hldre angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed 9w07iz. jac9k7rw,o ys+twn o in series with a 30-W resistor at 1.0 kHz for a total impedance a9.ioyj 9wkctn wz+0,rwo7s 7of 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 capacip4d;to+sz .nqp(3 mf ztor at 120 Hz. What is the phase angldnp+(fp mo3;tsq z.z4 e?

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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, ap n;s,wqy:3q60sny wivc+ci :nd 1.0-mF capacitor are connected in series?snpc +yw vq,::is360 yqwin ;c

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and az*,c-9zyg u xb;dc bg3 0.350-H inductor. The c yu; dcg ,z3zb9-cb*gxircuit 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 inducto19g)l amsg5 9 y wws3)0jwqafwr of inductive reactance 30 W are connected in series to a 110-V, 60-gawj1ga9 90l3s 5))ywwf w sqmHz 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 circuitpb.ie1ck:uw - containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tei.:u- c1p wbko 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 anvxi g/wlv305grd4go1gle o/3rg4g xivd5v g w1l0of $40^{\circ}$ 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. Ao )h.ttmiyg w3)0n,qs t what frequency should the circuit be driven in order to have maximum powesqgw y)it, 0h nmt3).or 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 kb3birtr1j 0 7jbx8ri:s u4z,.0 W resistance, 15.0 W indrr74 k1b 3xju,8r :bbtj 0zisiuctive 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 xs 7+bj wm.qe,fazx95$63^{\circ}$. 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 re6iqli.c yrhp5td7 7mb*u ay/d0 c -is.sistance of 30 W. What is the power s/0r.c.5dy *6qh77 td ii-i luy cmbpafactor?

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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 resistor, a d:g92hwmcs8f h3kt)d +1id q5 h5oqg b10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply3g o hfbscdd5qhwt m)k8+h1:ig9q2d5?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor j .c+ y+6jep4emg;a puand a 15-mH coil in series?c .6pa p4eeug+m;j y+j

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee6e:cf pz1 x ;9+.zp 2 ilw/xxgwersr1gded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHzsw rwfrx +.lz;c12 e:x g/i19g ppe6xz?

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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 serif:) togdn (l2hes with a 3.7-mH inductor for a resonant frequency of d l)f(otng:2h1000 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 z 4 k+wleyh)6ra 40-mH coil if the resonant frequency of the circuit is to hwlz kr+46 ey)be 1000 Hz?

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