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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 ar3uju )n7i1,y,v qtu :wzevm5ye units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stat b41asgt;.gtct; kp;ses 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 loog5,kewy *qb8:l2j0k q bx7fljps of wire in a coil produces what kind of change on theq2kb5*:0 xjg,l qby8w fe 7jlk 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 h-( : drymek,-jowz4vmze;r7 magnetic field through a loop of wire produces what kind of change r7dm jm4zz,w e(k oe;:h-v-yr 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 changr ahi3ai difdzz.e;si) ) 2:a.e on the induced d)z3s.eh ar2a) dif .;iizi:a $emf$, 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 magng +cov8z 9-wnyx velf nhcet.p9go 1i1)57v w1etic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductyd7,tob4/r yj or will be thatb4 , y7y/otdjr which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A ba4 i q+1 kimdsh-nu;lx2r magnet is held above its center with its north pole pointing down. The stationary magnet induces (whei qkl2nxhdsiu+ m4 -;1n 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 horizontd v ql tr2must0; ,dv9j+*1pical table. A bar magnet is held above its cen +td0um1,cd; vls9trviq2pj* ter 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 tzu.vt97tb5jrgr wf+zd583arl p ;1ts cj9lw.op in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed frw r9gzflt8uta7rcb .5sz1d+9rt53j. jwvl p;om 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 s +gcmpc6axr//9 9 ic ;f2qhup4iy q(ovector points straight up. They;fi/m/o rp4 s 2cuhx 9cqg9+ cp(qi6a 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 magnetict)6m/j wt.hc 9.al cpi field points straight down. The magnetic field disappears suddenly. j )/ tcia6w.9.m ltpch When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an e:a-m ,hd 5dd4mbau5sever-increasing current northward. Two co e-db, da5uh4m a:d5msils 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 8l*r *mbmt ak+l5xezdc6s5 *s m8n-dnwith the north pole entering first. As the north pole enters the wire, th8zk tld*b e8+-s*xl5mmasnr m c 5*6dne 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 rotat -hhv8d zm*2 :x1 ovfm*c0nuvow*so(eed at constant angular speed about an axis whose direction can be varied. In a on*0vwz(fvocohm8exs *m*u2 1vh-: d region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an ehx0ug7e8g ;laxis whose direction can be varied. In a region where e0 87x;ggul hea 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 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.gng l07 ur i1)ivcp,bo h:).qc
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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 c v,(7krbni y*bho+ (g3czfm *an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magneti)xv u0v w,pn9a8bry:+snv fq0*dc1 u:,yi v knc 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) ni ug l 8lux9za8c2ck +k0d:b+is moved northward at constant velocity through a magnetic field that points straight down. Makeld8ckik 8lua 2g9z+ u 0x:+nbc a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular v9ri- aj x2asr g04 ,lcbfwo6,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 transforml5p o(hydrxaru)1- u/s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequencyhpn nabt /k 96ji(/)lo of t jbt/ naph(ni9ol6/) khe $emf$ 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 use7dy *m +ntr :2tvz 1nc7aslw;id 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 dev*5gcc w s)j 5+og3eibuice 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 morea6h w +psuc :1;zw(fwd loops than the primary coil thw wf(s + ac:6udwh1;zpen 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 primareq p+ 1,4xd0tqi(deity coil contains more loops than the secondary coil then it tdix0q,id (t+ 4qp1eeis 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 l0j o1wcu+h nom8r y51q w6az,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 resonanw/k:+ceo 3 lh (n3 :cfwq9rwuet 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 indmkz 6p9 t67r fyyru15auctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t 6yt15ry76rukm9afp z he 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 sn )gx z9iw5ubr 5-e,kto an ideal battery of constant terminal voltage. At the moment-s ,9 n5zrgbei xuwk)5 contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with indh 4x :ee7ji:7v8, 5bnb edmyt8joe x1wuctance 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 inductance L and resistance R is connectzrgd p + lnqt/ol/i1)6ed 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 qb wc kr+pl .frme2 b8x02/r4bbattery. The time const 0m2b b8cr/.xew4blk2rrf +qpant 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 connected in series to a battery. T5,4y) q,b j wee.hgkbthe battery is suddenly removed ),.qegh,tey 5w kb4bjfrom 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 same units except:u; igq,,kj53zjcg6 st

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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 thi61b ju6pi/o mrs 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 sup6dsu29x(gqk3ygv)j r ply. In this circuit, the curren j2sy)r(g9v6 ud x3gkqt

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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 whu5iv ct77ko,g- mb lt6qx -i3jat factor when the frequenu,ig -7v mtljo 6ik7ct-xbq3 5cy 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, the induct)c6 bgorgz89 nive reactance of that oc rb9ng86 g)zinductor

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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 approa2 h(m8 q-0qivnngo0xw ches zero, the inductio8n(x wing -h00qvm2 qve 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 supply3nlo,:.vp ,2lzrl9 wiw/pa gw. In this circuit, the currentwn, l9wv lga2i.zopl p/,3wr:

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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 freqa th63:lpv5 odj w-ecpk6d:, ruency r:3t:elddo - 5, vhwak cjpp66is 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 capacss*d6*c74uhsi:zp d,oh )estr l77o aitor approaches zero, the capacitive reactance h7 p4o77*6,ss*szd d archu:tei)lso 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 capai/yc+r1fs.ra)j0/ f2j wf u+jr :wpvc citor in a RLC series cir/.jcivr +/rj1f p0wr fa)j2f+: yucswcuit?

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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 is defined v *o(3)orodurob:p85t fo(yyas $\cos M = R/Z$, 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 circuitxi2.,ya h/p pm)e7lqm . The impedance of the circuit increases if R increases. 7pp) h/ilax mm2.q,ye When 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:+ apokvhx1 6n 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 impedann1 w67q3 gf lq,wo.dzpce 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 anb,nqv5 fuq8 *qd the capacitance both double in an LRC series circuit, the resonant frequency of that circui*uqvqn,5b8 qf t will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Atusv0 gt r5 ebzsknd:2v: *(o:d 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 occurs when1:quzk(a40k o sog kmet a6jub7 s1epc(h x/;/

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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 i: pzd d9lfc2/bs rotating in 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 a9 fdp:ld z2cb/re 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 rota t((,jz5cj uzc dw,ho; +z*;wo fy0m h:oxcxb(ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when tu,+jw wz c:ftx ;(oomxczh 5(0c ;zdobh(,*yjhe 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 rada 6eah;1h2ez/fcc*p oius 0.10 m is rotating in 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/6 c1ho hfcpae*2;zea at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop 4d qf0coaw)*.yn epuidv9w5 / 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 c+bm.b wppx.4qhanges 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 framqqzd2wt. ;ph8 l7 7mn 5+gtnwle 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 inwmt5t7 2lhnqw 7ldp+ .8zg q;nduced $emf$.

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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 aredcc9bx )lol 76a 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 hte ihv7 ,jnn xk5046fgh-/thl+nhc 9 $0.20 \; m^{2}$ 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 h4 s4 h)p1bqcvsorizontally at a location where the downward component of the Earth's magnetic fiel1s qb4v)cs p4hd 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 angularopf8qtg y92c6at7hao:t q;s, velocity of 2.0 rad/s about a vertical axis through oa:6g tfs8qp;h9 cqyto7 2ao, tne 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 p 3:hv.:rhzkf+h3n xy50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aream*aqs x9rc3: yct7y.twfu z /. $0.090 \; m^{2}$ 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 lb9r/g+w7n dk5obfd ;eoops 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, what will be the maximum output voltage of this generator5 7b+e9dfr ngdokb/w ;?

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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 area v dpk8+frt4dle2v,b +$0.090 \; m^{2}$ 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 bkr cmt-xb4x; w qr;a4i2,sb -f0d) jysimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T iibyd s4 x 2f)mb-q, 4- rxkj0c;taw;brs 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 fj6)y 3;qtmb +cf10sk: rgbwwhzt3d 2with 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 moto (71jyr;xf-;jbl;d y uf 1smdar 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 resb1x6kb6wm 8k luf9)gqistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it ge uqkfbk lm 1x8b)9g66wnerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suhj:d c-v+6lmoi jyo85pply. The operating current is 1.0 A. What is the sta 5:d+o jhvy6- clo8imjrt-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 m1l0ns0 (z x/bz)sjx m6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bab nl x /)0ms1(xzm0zjsck $emf$ 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. *i ki4vng2rz c3li:w is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bal4krii*:3g wv nci.z2ck $emf$ 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 prim10k6bk b7mlpoc 9rrk *f 6rrd 53qwbf2ary 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 ofztb.+5v1 t myh a transformer causes 14 A to flow in the secondary. How many turnsvhm+1yt5 tzb. 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 necess.a9do8dn*q nlary in a 110-V primary if the 24-V secondary has qd d*a8n9nlo. 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 consi eeio q5x.9s0t1 ,zsffsts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what eq1ts9xfo fs,eiz.5 0is 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 tra//lbbfj o*c u8* xe4npnsformer. Assuming 100% efficiency,n*o 8u*bxcj pfel// 4b how 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 transfpi43ha vhjdj3abc6e ,/ hu+a/ormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dj,uj3ehca/3+ ab hidah6p/ v4 oes 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 g o4ejlnwm :nl;ywz)z-w*; u) primary coil and 300 turns on its secondary coil. If 120 V at 2.0 ;;uwl)ygneom -l zw)4 *:wz jnA 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 co(puv ui:0o3kmil and 300 turns on its secondary coil. If 120 V at 2.0 A is appli :0u(mio3vkp ued 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 19sphisxykz3+fy-2 u w .m34h c00 turns and its secondary has 200 turns. If the input c3-yh u3 cw zk9sm+sh42yfip.xurrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ,et9m,a vpb-thas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of e-a, tvb9mp,t 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 turswevv di6 ;q-1p(ihxy*f hz+.ns. If the power input to the primary is 100 W, we can expect the power out -.s(fv16 y+e w z*pqixh;hdviput 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 voltag/i.hiupui;m7ughub 2 3 p /qe1e is usually stepped u1h3 .gub/ eumuh7 qipu2p/;i ip 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 current hl8npwx5 /jbs 1(:xpem4h ig+at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the p hjw 5gbxh/p xs+1nei:m 8(p4lercentage 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 curp3 *8jnbxl k8vrent at 120 V. The voltage is usually stepped up to 4500 bn*vl k88x3jp V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long hasor334oda4;xltsh z1w a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, thsd4 3lto r4x1;3zwa hoe 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 0.60 W. A generamcmt4yh*x*joo*ghk .ozai/ 8 x )f(7etor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of t ofy4mt) m*c/j*xoa.xo8h i(z7e*gkhhe 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 transmittedw b/ )(ta:aeih)zypk + 3be i8ur*pn8r down a 6-W line at 1000 V. How much less power would be lost if the power were transmnert )iir8y b38+wua()a *ph/b: e zpkitted at 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 transmitted on a lin6j8ks89u3wvzm )2 fz .fgfrwde 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 ex8 fkrfsjvdufwm2. z8zw69)3g ceed 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 energy is stored in the co yjqvv2x;hx6 n+f2j l2s.l sk;il's magnetic +6lk; sj .;xxfs22jlqn2vyvh 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.pj4-u/)vu2rk,axsf(/r h2hqztde7y 0-W resistor and an 18-H inductor. What is this circuit's time constanx)rfh-(v 7zeu pqy/24ta jdrk,hus/ 2t?

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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 ank 0z4 jqprxt*6l;3zzd AC 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/mf0f6 3b+hwj7eapvj 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. n8zm mpgqf 9fh qoop-,d 4)9w* What is the resistance of the lamp?d )wmn9f-g,z 48q h9pqpof*m o

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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 p-vay2la;79wpn 0o ve supply. What is the peak current through the resistor?9vl02y pa a-ow7 pve;n

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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 acn; s vz1.j gk+dorxu.1 power supply. What is the power dissipated in th nr .u g;x.ojvk+1d1sze 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 resisttuh6rgl((t 7sor 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-x*z(q2wrp z2vW 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 resisi*e z 2-9lobndgg(r ep8;cfj -tor 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-mtop4 nh9fyizl aquln2941sl8*j;)5dsd cp 3jH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1n: mpxm)o,-rd000 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 cakao qc9l) 8.joil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 xu ain kmk.z)e)wf:yh0 9;5lb 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 AC at a frh9cv7 wshc1s :(el7kzequency of 20 kHz is apl ses 17kw 9chz(h7v:cplied 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.zf1rdi;6i4zx 3q* jbu0 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 capacitor at 1fm6ao 8m pa+2.yt6(j8 fjmdnp 0 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 ar2k+m gu;b 2r xp7fuawub1nt t8d-/(to have 50 W of capacitive 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 reactancv-kcl pw)po c+4)v :.)l jq wu5f1c.yesppdj0e 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 capa zian//ko cw 1 0mzcp339/qj)spq(vix citor be 100 Wvo(pa013n/ mz3qc jwzqskic p //ix)9?

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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 10qe* gv+erj6pj4bg 1i)00 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 resistance, 15.0vj0o yrfuhy5fiu5)vy- +1; ag W inductive reactance, and jui+- vy)5vf 0y1o;u y hfra5g10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1gel 3ot *4 ;w*jwz rs6.wq+rgdnak)3 s00-W resistor, 20-mH coil, and 1.0-mF capacitorlgat6wne3k.+wdj* ;g 43ssr*zow)qr 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 iszc.u8a4 dnm* 4 pal(kf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connea * knmuc(pd l.z4s8a4cted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isyqa :nr **5qer the impedance at 1r5*nqy :*earq 000 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 u8z1:)oam ybyseries with a 20-mH inductor, what is the phase angle )ob:u 81ymzya 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 series circuit with a 20-mHm1sslwg0t-+p js3l 7z coil and 1.0-mF capacitor fp0z7+1ts j g3sml-lwsor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-;k ,c1nxbjfw )W resistor and 15-mH coil to get a total impedance n)cx; b,fw j1kof 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 *8e q85jf czkxin series with a 450-mH inductor at 5000 Hz for a total impedance588z qjc fx*ke 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.z-).7s+z g enrp 9ar qrn*bns.0-MHz for a total impedance of 150 kW?9g.rn.)a7snzqrepnrb s* +- z

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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 m;- q/sjgbgc9in series with a 20-mF capacitor. What is the impedagj -9cgbmqs ;/nce 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 neerobgs: c*dw - sz,*qe,f,tvv;ded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 Wt*:brqwf ,dv,cvz-,s ; gs*oe?

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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 cycdbmu (8/ci9;rk7b.6, y( zovlwfad apacitor at 1.0 kHz for a phasefry(kv9mc y7.(6uw8 b,iazb; /dcodl 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 in series with a 30-W resistor at 1.0 kHz for a a9+8h +lvlgsg5k3nr0 az qlf90f.tebtotal impedance of 458f9 evlsg0l +3 g +0hklq9tabn5f.zra 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. What is the urrd3soa73 n 7phase an3 n da7o3s7rurgle?

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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 ifgqea8-)/aql p:/ :meem den+ n5eef a; a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesnp: qm/m galeedq5a);/ef- e en:e8+a?

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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-Wkc2)*-bx1 8y vet uunw resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-c u8ebv*xuknytw 21-)Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an induct:w yuj0hmi1hek ;,)wtor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circut ;,w10ek hyjimw)u :hit?

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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 ciycxd* 55ugp9y l92 5ct ovofd4rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when * oyy2c94o g5ufx55dpl 9tvd cconnected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with jzqf1) w7nt u*w8xfsn b7pthejh +.89a 500-W resistor for a phase angle obwtejp.n7*n fu jxf18 zw79s+ h h8)qtf $40^{\circ}$ 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 = k(xs d6e;z:zs: *ubuv 10.0 mF. At what frequency should the e;:duxb kvs (:sz6uz* circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac ser;5erx s.no pobwi4ma758br6 jies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pw6xrb587s; neboaj r45 pomi.ower 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 citgrwe7g( ow2x(w rt22y/h oj2b1 1tilrcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 1.kkwdow tr .1ru neo3yi)5t 0W. What is the power factor1kw) .todr0t153kw .yi e ourn?

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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-Wwu )lkai x hwy.4ka3y,y-9px + resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz 9 w) y4kxilwhu-a py3+x a.y,kpower 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 /tz0e *tmba+ca 1.0-mF capacitor and a 15-mH coil in series?be0+ a/tmzt* c

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needecjnbj/ (q 3i.-.rm5,ogq z6ky j0aybed in series with a 4.7-mF capacitor for a resonant frequency of 1 y.j-irnq.c0yk6 bmegz, q(a5/bo3 jj0 kHz?

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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 f5hv2trubbs a:eni0: /mjq, 0 gor a resonant frequenvb:qa he0u5 2 gri /sjt:n,0bmcy 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 m yh-- tsulq3w;rrjswyy70l. - lpi;f27mvb (uust be placed in series with a 30-W resistor and a 40-mH coil ij- ml 7; 7fu2.ur-;stwrl 3qyw(-bvlyph0y sif the resonant frequency of the circuit is to be 1000 Hz?

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