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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 units of magneticyp3br ,)0smrb 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 s5lztcf.;o,y7 l2:jib d9nf sen0q my4wcw6 0utates 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 what ka7sqb)uk;2;q,tqmsg gn lelpm 1h *33 ind of change on the induce3m*ugsl;7)k ems qp,b h3l 21 qat;nqgd $emf$, 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 field1r zk;+88b/ kz/ wx rpgw4vqtr through a loop of wire produces what kinkbt zz8g18//pq 4wk+ ;vr wxrrd 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 producc1xxrf 5 c,qb2a d1c;tes what kind of change on the induced,2cqcatb1fr;c x xd5 1 $emf$, 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 nmh4ph5* smv) a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induh ffkk7l j18foghn 11.ced current in a conductor will be that which tends to produce which of the following effelko fkf1ghn .hf871j 1cts?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnelw vsw ge:4v:5tpk-b; t is held above its center with its north pole pointing down. The stationary tg wklbs:ev-;4:5 vwpmagnet 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 horizovb1g1pkzgo4 ud5 )n5ontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coio k 5pz1g)u5vgd1b4onl, 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 uj9gs sib a,ol7wcq(.j:v0g2n;y9brwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as t (9u2,yc9g7nlv b riog sq.s0:a;jwbjhe 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 v4fii9 fyk m15xector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what i x1i5 i9f4kfyms 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 magnl b;l 05e2hjv2dbeniepcic +*c) )fu)etic field pointe icf iepj)dn5 0ub)2lh2lbe v)c*c;+s 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 a horizontal8 8p lprapo1uwxn 8mv2+5jb;d table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one o8nxd u jorv2l5p+1w8;bp pa8 mn 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 entexh s37n0g:xsnring first. As the north pole enter3n70gxsshx n: s the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosepzpsfhg) h68t2qm :t2iz cw*1 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 the indu1w p6iftp:hq2cz*z)s8g th2 mced $emf$ 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 constantyg)g,+r m )ezwj0qm o1 angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must beo),e1gqyjmw+)g r 0zm 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.m2nr cagp7t, +5/oigl
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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 that a- wdb vva.hxr9 em,y3;n $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Tbi9/vk -to,+tm eqr2hhe $emf$ 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 easo8 k+ palomye2;mmz-+t-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerni-k8yp o mm+ m+2zlea;ong 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-,i;mlidkxkqw +28y p dtg:w 1 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 qo:gq b+bzg 0: ks4*e s:qpud6m-f5y ( nelt4ctransforms

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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 throughi kc,v75t 6mnb 60 revolutions each second. The frequency of the7bmv5tk6cn i , $emf$ 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 devick 42lkss spmo6xnr9.t0q 0l0be 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 de-)g-yhh/bztj, hx)zd i 1q1 rt +qxxt*vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the ( wi n:sfeh19mtzw7*0 qvt8 edprimary coil then(9nhetq d1s*: 8wv7 tfmw i0ze 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 th mzi+g +uywyg+ z:6b(me primary coil contains more loops than the secondary coilwz b u :m(+y6zgm+yi+g then 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 power inputc/zogi p )-ps6+ yc0fh

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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 circukcu :bu/k9 :7li1sfc oit,

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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 conne/0f eizf6l /racted in series to an ideal battery of constant ter/azrl /60i ffeminal 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 connected in series to an ideal b.kzbc 1wpg5df 7qt; i+attery of constant terminal voltage. At the moment contact is m7 ;b5qid tcfg1.pzw +kade with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L andekm+ u:.:cbl/5 ibhbq 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 in3c-w um6crc3s ductance 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 cox4)wthl. c +aunnected in series to a battery. The time constant for the circuit represeal x tuc4+)h.wnts 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 coa8o0t j wrru)v zh4)b6/b -frvnnected in series to a battery. The battery is suddenly jthr fwb8bva0 6)ruro4v)/-z removed 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 .2mrtiq0vqkpi (6fn+ )b;zpp same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. Onkv4+drm;k 8jt 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 AC4scimqj7/m 9y power supply. In this circuit, the currentqym/m9 4 scij7

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancvpx3.*7 rhgp qe in an ac circuit changes by what factor when the frequen.7pr3x *vqghpcy is 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, thgym,n 0(u x/*skoph8we inductive reactance of tsnk0gu8mw yhp(*/,ox hat 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 inductor approaches zero, t yj-pz6yi,i: ghe inductive rgpjy ,y:6i- izeactance 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 suppyegelwn9q/2cj 3xl i 24vw13kly. In this circuit, the curre2 ywlqwk91l3xee3c24ijv ng/ nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in og3rtp8f**jz+x i1c.wg sz2qz8; kpm an ac circuit changes by what factor when the freque 321t*s.q z8fi+zcgxrwp*m; g pkoz8j ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approache .y4 ymdyxjj1h-5b1vm s zero, the capacitive 4m1h.yjd-5v bymx j1yreactance 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 inductor and capaci it)87yx -8o6o ewogzftor in a 8z-g8 ox7 eoof)tiwy6RLC 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 R*pg5l ;onj r8wLC 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)6ur+as am5as circuit increases if R increases. When is this statement true?a 6+as5)mras u

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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 circuiksfk hx)l2- 1mt 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 circu k(1tjbo 6rf1 1gyo 1 5/k0ye:ovvevjqit 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 serj .r,f6x,c0j17t ex 5mvpat duies circuit, the resonant frfd1r p,5tv07ux mjj t,x6cae.equency 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 x5tzu-3i dp0:v;o9m,gzk l ridriven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series Rdf+fn j( n6em7LC 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 magy4oxl/nqd5,p; y hg( wnetic field of 0.20 T. Find the magnetic flux through thq/x ; 54pgohn, ydywl(e loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatingl59b it8cw/ km in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a/5bk9lt8 cw imnd 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 fab-su*-dq 87z9 xqxzqield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi * xz8q-s7bduaqzx -q9eld vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of anz3a sj-/r )/zgt:n:(fnw errl 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 fv(+9hd 3hhzh(pv8 vxlhkh 0.m) 6i rj7rw;rzw rom $4.0 \times 10^{-5} \; Wb$ 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 a539*t. qy tmpxxo- 7dmgwm f3r square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducerx3*9 mt dwpoy. x7mfq3g-m5 td $emf$.

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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 15d nw:szp-gdj. 0m3 -ibxu0q z; 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 aa5,sw0 fx)tnsrea $0.20 \; m^{2}$ 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 spl7yq4 dkhdh,u4knomob1 yu9 dp4 (n0:an of 60 m flies horizontally at a location where the downwarqyh :bk 4n k,pln7u1y49u dmo0o dd4(hd component 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 v p.r+ yokweedk5nd*i* 1us+-delocity ofye-ids5k+r.d +*1oen*pwu dk 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loq4y5in9 i.qpbdy*e0y ops 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 bxh3vwg3;5ol wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lo6 :yrif- m/hpiop 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 fi/p6:if m ry-hield of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of 0 peww-z/ kswsv/es+7 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 generator with an output offcc6p,csbc57 *j5qh i 12 V maximum whe ic6f5 b*sc,5cp 7hcjqn 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 w e n6/rk6 bq2xu/;ws:usf,nf 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 havn37ra 8tbx bhxn; qiw05mi0:qw5 ck i5e a resistance 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 resistanr, gsfq5py7k+ce of 6.00 W. The motor operates on 120 V AC, and when rp7fgq+ 5ys, rkunning 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 6.4lkdpf7a8 /uglp.u j jlk 4u8*0 W is connected to a 24-V power supply. The operating current is 1.0 A. What 4. p4788lf/kuj plg djlu*kauis 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 W57x/ib6hvqo/3jof4vbh4i(ot/po ( m z7mn xd is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What i(dxb/j7i7inh6oovt45 o fq3v m4xpz/(h/m obs 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 a 24-V power supply. +ls o9 ,u(0cp b1rfngtThe operating crfbs9 1p(0 tcgl,nuo+urrent 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 d5 (r 1kbbrc(mnt-v2hto 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 cxr)(r9fj1ijhe2w 9wg auses 14 A to flow in the secondax wg(ih21)9f9 erjjw rry. How many turns 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 the 24-V sac,my7we 2v c(k klnd:7:r ql4econdary has 100 turns?yar4cml(ek,7 v 2 qk nd:cw:7l

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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 primaryaxfb/r0hkt:p21 4f * wwli 8ou coil and a 2000-turn secondary coil. If the curr 8i20t h *ruwfolfa:xb4 wp1k/ent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transfo q6/ea6mzan .t3t9gjcrmer. Assuming 100% efficiency, how.j/ctta e6q9 gn3ma6z many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7il h9xflfrz+5/ h7b6myb ;1fc500 V at 10.0 mA. The primary coil operates on 120 V. What does ybmrbh/fl6715lx 9hz;cf + f ithe 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 p fabm fgn;hxnx960(j )rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the g)am0bn6fxn; (xh fj9 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 turns o2*pqvzkd 1jmjdu) s,f f*z5/m)sqj. 1s cvo-kn its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in t 1zudpjqs zfvk*jkvcf*.mos m5 /),1 j-d)qs2he secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.zt1zi1nc (o68jr c)+toulp6 r If the input current atoc6r1u(t zt+r1c 6n p) 8lzjio 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 transfzgb(w+1p/ t yi9d5bt eormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can eg/z(5dipt y+ebt9bw1xpect 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 anu ;c( 9zch3.fyrazep6 d its secondary has 200 turns. If th.cy 6e z;fc z39uha(pre power input to the primary 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 usually steppedm4(lpm8ijl i 5/ws2l b uiilbwsm5j8m( 4/ 2pll p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the 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 curren6yetdk* .g ff/t at 120 V. The voltage is usually stepped up to 4500 V by a transformer a/ yfd6kt efg*.nd 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 voltage is usually stet7ztsq.sl+a.-(90:k o t gt1x ndbn fjpped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0.bdot tan0xs: +.t qfj9gsnl(tk17-z W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resw4ifjo -tph 6bay5i.b-cx-g3tf) k(f istance of 0.60 W. A generator produces 100 V at 70 A. In order tjt - fgb )abf65wi (-ipc.oyt hk-x43fo reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of.x 3rx66 mu;rnmn4grf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a txu 6 r3nfmr .xn4r;mg6urns 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 leg si9)7o/chzw q9 smojs:p7+vss power would be lost if the power were transmitted at 3000 V instead of at 1)7goj/ +isoc7 m:9wvzsqp sh 9000 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 bei:1to5 s4bxznc3-)pt:zayrq4lmy 1 u transmitted 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 l1ot nx4 1:as)qp 4t3mry- zb5i :czuyto 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 enf0sq0xk-l5mol 5o(3nqx fp /sergy is stored in the coil's lf 0pq0 n-x/5fxmlkqs5( soo3magnetic 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-khk4 4 (gka -*pmx*aq .hwik4bH inductor. What is this circuitx.hkb*kwk*ph4amq a44(k gi- 's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an A74luzd az. ys2C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the psm64pxp ve34 aeak 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 resistanceue5lcs n x64z t4t6e ohodt.6( of the lamp66 z tocxd6hnt(ute.4e lo4s5?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak a8fvmn(qs-i9durx28 vr1sv 6 current through the re fvn6r8(saiqdm-vr u v 1x829ssistor?

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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 connec )y t*4c3 gequfj7sez o/:ew0fted to a 120-V ac power supply. What is the power dissipated in the resist0je cs/ye)woez tq 3f7ugf*:4or?

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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 r 37raaw:zbpx l0d9l,pji;mi +esistor 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 resisto *:)-7fkw u svbykkk1or 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 resisexyd e+ 2d 3fdh1,-zxctor 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 reactanc+kpv+p+wss (;k*kjn le 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 reactau dj-en31o9bo ue:s- dnce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W p*qx2p mc5 i ih.szf28of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reac2ps-qs s+ 4ua5 pd) p,b b07gzn o4ngc9a2mtcptance 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 ib qqnyd:4t (m 56a:pppn a 60-mH inductor when 120 V AC at a frequency of 20 kHz isnd4 :qyt bq5p(pam:p6 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 due to a 110-V, 60.g1h, 5m8qoe t5 sl xuh,:k7dqw0 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 capacitivrq vkz.*gm 1t6e reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?2 cwqmrcw:b,n(, 3 hky

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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 1gcttm(ydz74m* sk o:; 200 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 thb6bfi,c m*i6r e capacitive reactance of a 0.010-mF capacitor be 100 W ,bim6*ifcbr6 ?

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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 ,. wmk v dq-sn;-fdlwy*j+zl+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 circuit with 12.0 W re9v:fr +ucc/ 4nd ylhr,sistance, 15.0 W inductive reactance,y/n+:cfdcv l4rh9u,r 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 m aa ,d)g:yzcu:,fxm+: wg *ubHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri::a ,m*gg ,d)wuubxf yac+m z:es?

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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 8gr9h tp02osyqth; ;)q lgg4m l(gq+iresistor, 20-mH coil, and 1.0-mF capacitor are connecmhrq2s 9g(l 08tqlqhi4)g; tggp+oy;ted 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: g9-e 2 ,bo 7e,sxuvxq,r 0knicmpy9p in series with a 20-mH inductor, what is the im20o-9 ,xbryn, pv,p kcgiqueems9 x 7:pedance 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 seriepaw r f:1g7nlo6bpinwzg ;9x .p;x,v1s with a 20-mH inductor, what is the phase angle at 1000 Hzgp16axx l b pi.;o:9,;vpwgrn fnzw17?

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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 circuia4uc5mbuq z *9t with a 20-mH coil and 1.0-mF capacitor foru b9u* qcm54az a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following 2ud+:8 5p3hvpfi:skdx785dq a aza vq capacitances is needed in series with a 100-W resistor and 15fpd3sq:88a dp v7z5 xq5 2h :akid+auv-mH coil to get a total impedance 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 4df 7qrcj4)ry ;50-mH inductor at 5000 Hz for a torc7f j;qr)y 4dtal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for ac5zr 1xn2b) evf+l+c,fe mx s/p*oc)a total imcame+n* pbfz2ox5 + x)scle1/,r )vcfpedance 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 se4 vdgm;//8+xy ue-evhzt-a j:n oq pv*ries with a 20-mF capacitor. What is the impedance at 10x;tv-y8n* :qo4u /mv gdahe/p- ev j+z00 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 u30d8 egfx;ez,b.n;vse24.dze xysp 10-mF capacitor at 1.0 kHz for a total impedancygx bef.e03s42,v ueezs d8;dz; .nxpe 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-m/dp2 h-(n dtzc)8jiayF capacitor at 1.0 kHz for a phase / 2 ncjzi-pad8y(ht)dangle 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 k9 4 ai cnhr(no*(kzi+uHz for a total impedance of 4(9 o *ru(ch+kzni ani45 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 seri(ss7aib u(ovo,b c5ivn +xt rk f;8 +q8ygj+-mes with a 100-mF capacitor at 120 Hz. What is the phase a m o c+(iyxv+;tsksa88rv7qi,o j f+5-ng(bbungle?

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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 resis y,o75lx 9, o8y fiasuvk-l:fhtor, 20-mH coil, and 1.0-mF capacitor are connected in series-5, l9ou s:fxlko i,fy78yhav?

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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 resis +5yua*5vk2.2 cbkuiqzm acm7tor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pok.2 zu *icvu2b k+qycma5m7 a5wer 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 inductor+gytfy1z7lbpgy ec+4 0 hlgfh60.3kd+p+s td of inductive +g0dkz4eyyc1 3.ftp06+tgh yl +l7gdhpsf+ b reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W nps;+a5qb k 4y) jzde+1 pg -t/iivxl:-j,ut bresistor, a 10-mF capacitor, and a 0.45-H i-t/ i j)4u q+s1d5by-k ,;pjn :eti axzpbvl+gnductor, 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/da:a9s: yxv w series with a 500-W resistor for a phase angle o:9wx yvaasd:/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 hash);fawsbuq.g znj3 9w;b 3q6s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum39h6;fb);. jq3suwqs nga wbz 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 s m9diz7( ,ef65wj lqd12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power 6(9mlq7sfjz w,5d d iesupply?

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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 isbd2*u jmnx/ fg5dx iko9(/3ovqr u+i: $63^{\circ}$. 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 hwep pb2n3*b mso 87v9jas an impedance of 60 W and a resistance of 30 W. What is the power fac mwn9b7 2*js3v epo8bptor?

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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-W71bmp.eep :b 1uumc)j resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po b7bm p u)jm1:uc.ep1ewer 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 v pkom8(*pq fc3 e/y6nfrequency of a 1.0-mF capacitor and a 15-mH coil in series?nv83f omceqy6*(p /pk

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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 c0.osc 7,k 9qimo:eonbapacitor for a resonant frequency of 10 kH9:ikemq0, .bo o7socn z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed x e*n4 g.dzss.))hy cqxq +js6ffs+:din series with a 3.7-mH inductor for a resonant frequency of 1000csf:f eg4x dsjd6. .)*qnx+ shszq )+y Hz?

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142#
 
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  What size capacitor must be placed in series with a 30-W resistor n y;2jnm9r o9anv(o*d)gvd3 l and a 40-mH coil if the resonant frequency of td o)vo9j9ry ln(n*m;a vd32gnhe circuit is to be 1000 Hz?

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