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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 magnetic fmyev ,9 wc hmx8:a7oy;lux 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 inductionmnynl(5( nxny 7z 9vr3+oha5i states 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, )p8cvqu8zq ,o6p zhj of wire in a coil produces what kind of change on the induuv688p,) jh,z oqzp cqced $emf$, 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 4h a:5ekvvln; of the magnetic field through a loop of wire produces what kind of change on the induced 5ae4vvk l;:hn $emf$, 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 change on the utkdq9,tqbiudw mtqxpb6v6.8c 0 -.6 induce9t -udqub bd 6qm,xqvt6p.tkw80.i 6c d $emf$, 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 54m0rs v m/vv89rvoevfield 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 direc mfj55g5qu8jk6 lonh81 ,wv)wxbg6e vtion of an induced current in a conductor will be that which tendsk5 66 g) mwe8vxvnjql 8gj515ufhow, b 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 thuuknb: 0 1mt)able. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fb: kn0u)u 1htmrom above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is- mnnd.qcx48o( zsej( held above its center with its north pole poin (e xosq8(z-4j cdn.mnting 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 magnetic fieloa-;kxo( o7shd vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current ihk-s7(xo ooa ;n 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 vect+;(h hzul1 p;( qvtkaror points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the l;hkurp+ta;(z(q 1 vh 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 d nwq6sm*m o+5qlu /:gd(+pjjin a region where the magnetic field points straight down. The mjjpq g (5l*:+onm+dq/dmu s6wagnetic 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 l67 l 9v;6:msedig9/hode 9my,6tj nwglqivz1ies on a horizontal table and carries an ever-increasing current northward. Two coz:sith6 9mydeldvg g lwviq16 9m;76, e9jno /ils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. n2f8 t: )do)ilsk(fdx As the north pole enters the wire, the induced current will be (as viewed fn8xi2stf(dk d:) l)ofrom 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 an56rmgqy u-5wm gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation ofr6uwy gqm-5m5 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 spee. l v*9q6*iyedj dnk)od about an axis whose direction can be varied. In a region where a uniform magnetic field points strnoy6*elvj*)i 9 kdqd.aight 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.0lat da f3*i / 1.d4t(swlnceq
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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 an 11g -w; xqoh0+lslq n+o4fdeq$emf$ 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. The k*+c2/ea-to3f t ypxa$emf$ 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 dn v-u3ia6j1cr irection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induuc-ni6ajrv1 3 ced 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 cobgr2f3s j;4l++a vn ica0 .uqtnstant 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 generatorq(fnf(k c67oj transforms

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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 frequencyers3 4aow y6eo71+sb a,cq pc( of tecqp+b4ssa (6,awy7oo c 3re1he $emf$ 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 drnn 3(x21isdvt2c x )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 (g*p z8 g)e,t4tastmz 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 containswucapr 5gf(.q 5a9w,c more loops than the primary coil then it isq ww5.agp5,r 9ufc c(a 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 *yn: (vnv9 e49xmpnheprimary coil contains more loops than the secondary coil then p:v9emhn*y9n4ve(xn 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 pow bcicdq54 rqk :8lo1k2h.m/ ozer 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 resonant79) wpe 4ytej- pnq-rb 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 indua3 z(e,rp8 7du3x2is-uq ojsx(ekw :s ctor are connected in series to an ideal battery of constant terminal voltage. At the mksa :od e,q(2wzj8s upxx ius(7e3r-3oment 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 battery of constaesz1)yb0, odu1 f 8c+f4lyu rnnt terminal voltage. At the moment contact is made with the battfb)s+lo0y 4c y1du1 fz ur,n8eery, 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 Li/w m3bz):u5 z nv5kjx 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 y ,e v)it(kx(f9z- f* qvjnuq-t7 hb7lresistance 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 battery. The tiwbbdq j c:.nu6jc()g*qc cuf9il, (2sme constant for the circuit rg.bc:*id wnc6 c (sf2)qj,q (uclbju 9epresents 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. The battery i 5u ,xc:flyo,as suddenly removed from the circuit. The timecl:yfx,, ou 5a 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 havcoj) b 5zk*u-ve the 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 bz(z8v zpj1) i qc0y2nAC power supply. On 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 con)l7w z*::qp9oxlww canected to an AC power supply. In this circuit, the currenw:zp7cq l:ww* l)xo 9at

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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 circure/auk-n/ew/7ld n /yit changes by what factor when the frequency is tripla/y/rd e lnne/ kwu/7-ed?

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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 acr2ia w3x kd*ex,oss an inductor is doubled, the inductive reactix3k,*d xwe2aance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approacx3a6jwropsr /3rs b4 3hes zero, the inductive reactancasob6/ rwj43r3 xp3rs e 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 connm1p;*w (fsul4-4y w:hjm l 8v wt+mgvnected to an AC power supply. In this circuit, the curren mnh8p(+lw: v4j lmgy;s m4-*wvuf1wtt

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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 whe)y8r-o/y hn ne9r qwe-1 aj;own the frequeh/-yw j annro)r q8we-y9; o1ency 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 acro3e(a c a0s 4bipnvzr,4tck/z p,(4bc lss a capacitor approaches zero, the capacitive reactance of that 4 , tsieca vlcb4n,0bppzk34r c((z/acapacitor

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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 theb*nnfkeylhwo+; e51 3+qixv- inductor and capacitor in a RLC series circuitq x+newoekb3 yfi1 n*l5+-vh; ?

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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 as qg9:l d+zzx+f mi4a-t $\cos M = R/Z$, 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 increases if R increase1d.x,hxrs l4qlf is j1ew7t*(s. x(j*s,l4t lxwsd1 ir. qe17 hfWhen 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 incr0 ic2,1ku7qp bo+usdn zpa+ .3pg8nx jeases 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 serie 3t( tl2oatz8bs circuit. 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 capa .w;fz) u)ynmzcitance both double in an LRC series circuit, the resonant frequency offuy)wzmn).z ; that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volta1+;x:jkujzaxldcw,q 3 5y3c , bttxi 4ge. 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 seriesy4ka0hfmqip3( q .j.p RLC 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 magnetic field of xf 5y*cf3+ sed0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectorsx +53ydc* eff 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 radiusz *tu+:,ekzl q 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 perpendiculaule,k z:z+*qt r.

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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 ui6fzd,d uhf 3a.eb((dniform magnetic field of 0.20 T. Find the m(z (ud3ifea6.h,bdfd agnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fromaw) f30t ir7:/fe gtaxl1*hel $1.0 \; m^{2}$ 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 )ry80zh9olvm:3)7 e ermnhk v 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 turnbj5h fu9i0 vw2:q w/xns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducexw 0w/ubv9 2qni 5:hfjd $emf$.

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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 an palv0 hb2v4j-;/qwox j./wmjd 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 ar4f/ hz30rc8drg-vgvy9-cgz: ) jxuzn ea $0.20 \; m^{2}$ 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 horizontally at a location where jkj7s7s u o tj,r)bdrx -:8 :*/ge bmdjs18ksothe downward component of the Earth'sx mgudk,br7jo sedsjt-oj)j7:*s 8 1k/ s8:rb 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 velo*z5ewo1ynz 2 th,9v5cva h(b :flno8gcity of 2.0 rad/s about a vertical axis through one of its ends while inh 9:y bvo, z*zfwnv82ha (5cne15go lt a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional ared3 (ucrxsr rd/f0.5b za 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 o+z7. bjgp zgrb,gm 8k/f wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangularn 6e)+n9c3pil2vvb5yrl j s 4r 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+bs)2l9l6r35 ecn v4ir njpvy. 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 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 wirew0mpd o:uvbj)ipkj:/w w9 nyy1c7q-3 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 simijtus()5o7elxuaz549m b i, sple AC generator with an output of 12 V maximum u ) o97xei 5tsas j,i(mz4ub5lwhen 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 a0y9qnuk r64 oyv7qlqhv8qhs/obt9- 4 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 resistlughj wi;roe-j 0jt7e 9qk)*a-*lr+mance 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 y( ouxyx4 6vp)have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bop(x)x yu6yv4ack $emf$ 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 powwefxr3z0+ m gtqe i, gw 3+uu7x6+o:hm6ip4poer supply. The operating current is 1.0 +qxpioo: u m gg+ phfr64im wt73xuz0ee,w63+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 polxry)pt) :u+xwer supply. Th:p) ytx)u rlx+e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected9ai1m0 h4;mjnadx2by to a 24-V power supply. The operating current is b njx4dmi;a0 1my92ah 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage opw-sgtbyr 6v b i.c9 9jh78uz*f $120 \; V$ 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 8-s6atpivo r awb93,/apyo(o flow in the secondary. Ho3iwtopb6ra,9v poa as-( y/o8w 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 priur d+ pk8798jp(x:knhe ;oxurmary if the 24-V seco: kn 8(ou rkpu79d8jxhr+ p;exndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of pte )br*4 6lbqn a8b0g mamv..a 500-turn primary coil and a 2000-turn secondary coil.m vab*n0b )b me 6p8rtal.gq4. If the current 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 i74xf/1/sym2yr r5ee 80w tyfl t*kebthe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondar 0*w mr y2yey1 kl4e8stx5// bi7rftfey?

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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 7500 V at 10.0 mA. y- wxej3l-2 dvs bn:+fThe primary coil operates on 120 V. What does the prima-f-v s3ejd y2+nw:xl bry 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 c8etruqa97 8aloil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vqle9 u a7art88oltage 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 co7yqn,f:2mthwb5hm n (il and 300 turns on its secondary coil. If 120 V at 2.0,ynmt 5q:(mw2nh7 fbh A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. fit 5 0amcm;t,4gclr8 If the input current at the primary is 100 A, we can expect the output current at the secondary to bl5t4 i ;0agt,8cmrcf me

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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 transf,gr4f.jzm* /e/r chcl ormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outplcmg.jf / rz4/ch*re,ut 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 tuzf x.g4*q ppypm,z2es/napf *wjo;/7rns. If the power input to the primary is 1ma. 4,f2qpj//;yp* wpns p o7z g*zfxe00 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 usualq vku:7fa wt((ly stepped up to 4500 V by a q uvk:f7a(w( ttransformer 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 6z3s(-rq o wqd8 s53yukhdh:i-c j+huc 20xpp60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to- phuhird25ys:8kd zc3op 6shw -u(j+ qq0xc3 tal 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 o 1,n **es0f4/nu qnooyec/fustepped up to 4500 V by a te */efnuosf1no4qn / ,cyuo*0ransformer 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 has a total resistance of 0.60 W. A gt3 y1)khaiuc 0enerator 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 transformet3ah 1 ick0y)ur 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 resistao; daa )mvp1t6 )wxs) h)l9almnce of 0.60 W. A generator produces 100 V at ad)v )mt9 pslaw)m1hl6o;xa)70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 x,xgw ed 7ahd*shlhcs5.5f.c: (yw zj*9og2 s6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead oh7xso5*x9w(l2g e g c 5*cd .wssz.haj,ydfh:f 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 2amw(cr 6lx(y g:lf7ztransmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the(c r2 (w6lgm:a yx7zfl power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is store/fmq hq zfr*h8g5u +4pd in the coilfrm+ 4h8zqg/hu5qpf *'s magnetic 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 c /+ zb8u r8m2yh-bc3pbv7xaq-W resistor and an 18-H inductor. What is thi 7bx2vr c8 u3ypzb-8ah/ +mbcqs circuit'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 i 5 kl5fzc x-6ashqp1mj2g/(e vn an 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 ))xkdmcmjn(3j4ja 3 oa 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 place2pg8f3 l; qqru wuc,veh6ko7;d into a 120-V AC outlet. What is the resistance of the laol u7ukq8; 2 ;3qg,cfpwhvr6 emp?

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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 con0 )yuidyp 8*isjav iq8jokq( ;c4zv;8 nected to a 120-V ac power supply. What is the peak current throu*0v ;qic( iysqz8j v;p4 )aidkyju 8o8gh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V a( y34zx84:3qh3fiyf0 1qrd ugxuzw dqc power supply. What is the power dissipated in the fyz4u3f1:8h0x(43irdu g 3wy qxzqdqresistor?

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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 resistor p5cgaz t)nycy . ;j8e)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 resistor i 8gwo;-ktwv xz,)+ wwas $I = 0.80 \sin (240 t)$. 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 :x70 *i b0xlkr/xlsmrb1 bg;gresistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H4 it1ad+v+urq 2ao pj2z?

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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 10006 8cb/uls 9mf;6 jhmp2qsq 2xk 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 pi;2/f fyrw.b14.0-mH coil 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 W of inductive reactance at 10d0hx( m5 4slpq00 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 w:6;ay7lex/ r bemi2r zhen 120 V AC at a frequency of 20 kHz is applied t;z6la/ e7ir ye2: xmrbo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz r0ultj :s.wh7u .2wgn 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 capac:a i iugxdr37*ww 6(qfitor 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 reactanl l-nyo2k/d 5tce 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 10y8pv tgn5:mp0prn8*q -mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be i+/b8 1ywe uhudzmdq r0;g12y 100 W?r dge 110+uh2dy i/qybw8; zmu

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 sgse*x; pw4- l7qyz0 oV?

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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.2 ,yzuwsv/ot+rzz-niwf-6 h u *s wc( with 12.0 W resistance, 15.0 W inductive reactn y/*i cwuz+2ou-,(-wvs.fsz zhrwt6 ance, 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 vym39jd8um 13(sxqgwc q c7)n1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecxm13g y8 3dms7)nccv qj(uqw9ted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-gyt. gndjml./ f.doaio*;u 1 78- centmH coil, and 1.0-mF capacitor are connected in seriesg.ttg-f .d *j8dmu 7n.cnaiy/ol1eo; ?

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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-m mozxanh(zzi* ,k 0xh 6tu-)d8H inductor, what is the impedance zhi-nz uzo0 x* 8 tdxh()am6,kat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, xz 0 vp /ht+;l8e8od.u lb5qluwhat is the phase ang+ z/b vluoxl.lpqet0h5d88 ;ule 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-mH coil annjx1r;i9zv8.g ;b ub pd 1.0-mF capacitor for a total impedanci xn;8.1zpj;rvu 9 bbge 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 isc( mrq+6u;ypj8,r0 smo,xlty needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W,+0jlmsor8qcmxruyp6t y , (; at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a +-- xxatm(foftotal impedance of 40+fxt-- m(fxao 000 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 remwp4qw 3cd 7yqloiy* *r9gb( 4sistor at 1.0-MHz for a total impedance 9g c4lrmqoyyw (4q3*wbid*p7of 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 20-9fr1k9 tihc a,mF capacitor. What is the impedakh 9 ric1,ft9ance 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-mF8yvg;il : 3bh)pj(q :ly7tsxv capacitor at 1.0 kHz for a total iiyxq:syg(ll7j8) ;3vbt: h pvmpedance 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 7j1i m/i fouqpbz1 4+ ggb580ma;npjtwith a 10-mF capacitor at 1.0 kHz for a phase an;18gj0 4 ngmf7b1p miqzpit +b5oj/augle 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 gcu(* 9.k)hjr o mnev;8gxl*di pk1n,with a 30-W resistor at 1.0 kHz for a total impedance ofkp i9(8m,ej* nggx 1d *)nocrvhlk; u. 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wh3rt .y3 o5arxy+ii tw-v h7/ksat is the phase ank73-sw+iit.t3r/vo5y x yar hgle?

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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 150g0hvahy 2 l*t 88pya:j0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte yaty*vp0:jlgha8 28hd in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W r pzte83snxbz 9b48*haesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cux bt9* pz8nezhsb4 3a8rrent 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 capac( , q aj*byt dv0v+4qba8ur-zyitor of capacitive reactance 30 W, and an inductor of indu0rza8t, -jbqva *yb udq y(4+vctive 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-v);cs( 3 ilioiW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to3sv(;)ioi l ci 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 7uihu*r ,1dneu / rr3tresistor for a phase angle oid huu/te1ru7r *3n,rf $40^{\circ}$ 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+i:ys4 c r0yd ibyl6(d, L = 200-mH, C = 10.0 mF. At what frequency+dyd:rybc y 64(i0lis should the 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 series circu tgqpd8cftv2dv949: jit with 12.0 W resistance, 15.0 W inductive reactance, a9 t2jtcdv9v8f dgp4:qnd 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 cvq0yhjy/u; zggul2q ,t.g (fg) :v,f b7c6racircuit 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 W. What :c2q fdp7ibals 1-j.v is th:bd7.qifp vsj-al2c1e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC(4gnq ct -/otv4nu *tz:r /5sjr2bgxi circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup/4 -:tbt/rgn joc2x4itv*5z n(g rq suply?

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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 and a 15;q0rkxaj3nal n ,i43o-mH coil in series? ,3or3;4lxnnaj0qkia

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needgi1 5jdo ik:s i4i*+lted in series with a 4.7-mF capacitor for a resonant frequency of 10iltji4d+ 5i gs* i:ko1 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 w kl)w arx742 *re2vrmvec; e2nith a 3.7-mH inductor for a resonant freque272r4 l*r )na2verxk v wmce;ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resists*s s: ripc6d*or and a 40-mH coil if the resonant frequency of the circuit is d:6*c*pisssr to be 1000 Hz?

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