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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magn i m mzhqt 97f ;,dnb*ru)8yp)sx.g.fxetic 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 inducti3u2do2zbo7*v-kaxxa on 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 of wire in( b m3r/qvlc+c a coil produces what kind of change on thc/c3bl vqm(+ re 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 magne-5y5duvmj34 +zausylw vl6d +tic field through a loop of wire produces what kind+vys muw5udvyljz4-3 ld5 +6a of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thpz+s5gg/du 8r e indu g8gsrp/ud5z+ced $emf$, 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 frosfx 7i4k+q4 akm 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 induced current i+7vct bfjym3x 4j 3gjzgq-0 o-n a conductor will be that which tends to produce which of the followin4jgt 0f zc3qmv7bxog y+--jj 3g 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 fla-ucbo 0mr 9.4vf8axvu t on a horizontal table. A bar magnet is held above its center with its north pole poi uxf98 ub.rv m04-aovcnting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. 1n.qkbx5/ )q84klx ov imn0oqn-df4p A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coxx 84f4) -pnnvokqoq1kidqln 50 b. m/il, 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 iryudf:.5pky7k be brh5 0g h)8n a region where 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 the bkkg8bd0uh)e7. y5rr 5fh: ypfield 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 tabllev 3shzh( 9jb3 t7s;w1mcqv7e top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ( 7vcj ;7hbsve 3sqzhm 1wl3t9of 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 regioo 0o :xtagsb,5n where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappear :xo0stoa5, bgs?

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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 c mswz:)4zp3j carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abzcmw 34): pzsjove, 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 enter(vxt8 wsfzbaw,., p p0ing first. As the north pole enters the wire, the induced current will betp,pxb ws v8wz(f,.0 a (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 constan0mdncx0m2 3 fnt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriennfcd02n3xm 0m tation 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 ,qig/n3 m(56sf0g rbpf rnf q3at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must,nf3qm fr3fq n6gi5brs/0g (p 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. .1tu+jggxbv(bx) za a)ul *ej9t,;j a
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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 thaagv4tu . tyia,v.h+ds,+ h*zo t 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 magnet6h0e bj9 ,ain5qmjc *gic 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 (orie4uixn5jyf aft-;m x-(nted in the east-west direction) is moved northward at constant velocity through a magnetiyf;i a(nu45ftjx x- -mc field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constan*sy15l file/)jcn,qr t 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 trafqvv5tfv8f e9e+oz dr)n82o/ nsforms

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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 z4uy0ok q y d;xzfph5m7e7a56each second. The frequency of the 04hydfz mx 57ou5ap; 7yqekz6 $emf$ 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 w,rm+o) 3z w6c uwjvb(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 deviat.)f-l xpht62pvqhm) jh l m)kxc: :.ce 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 (h6zfcyb+1qv vp*n ;v0vzo/ vthe secondary coil contains more loops than the primary coipnyvb c(1vhof*q0/ +v6zvv ;zl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary cobud(yp+t*niq x:p 0b6 il contains more loops than the secondary coil uby bpnp tid +0:(6*xqthen 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 ing 8 6)w(p tibsh nn,, eb;kg7aket85yjput

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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 circuitb;w xj,k asu; 5qd)ii 4i6;sbd,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of co ,2xyixvhq*r(ez+77am a :ofknstant terminal voltage. At the 2* kzyfem 7xo7 qa,hvai (xr:+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 battery of jfhk2hxg-swj0/ y zv :qlj ,6;constant termz ljq-w02 fh j;/6sk g,:jyvhxinal voltage. At the moment 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 inductance L and resistance R is connected to an psbra-5kq2i.1- auqyf4pwv3 $emf$. 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 resistancem bdcre87 8qai4t(:yp 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 b; fl(r3iyn jj3attery. The time constant for the circuitl3jr3fny (j; i 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. T f0xy6ai8imc, c)9ilo he battery is suddxmf9i 8oc 6iiya,)l0 cenly 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 same unit648 z vqs j1hr; x:4d2usyuvlhs except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circo(ssov / wk+zrfl/2+p x3y* zduit, 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 cosf+ jdaojj7rxc /p+0il9 ;3d e1lb9 kwnnected to an AC power supply. In this circuit, the curren3arjckje b+ +l owi ;p0199 jd/xd7fslt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactann(bez)j bapv8i6(1w ev u7v9g ce in an ac circuit changes by what factor when the frequency wb78eji) v 1eg pab6((uzv v9nis 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 volt/ne /yuvi+ 3drage across an inductor is doubled, the inductive rea/ vun3 eriy+/dctance 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;(5z3lvd -njb l2yb stv sct;- an inductor approaches zero, the inductive reactance 5jyt(;nd3 l ss-l tvb cvz-b;2of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thi eff)q ,(4,b1wnz)80x otog 5 rvu6zx(rryc sws circuit, the curre01) z4wxoxsr8 rby,tneucg (q5v wff o(r),z6nt

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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 wra()b8lr 9 ypwhat factor when the frequency is tripler(b9ly)8rpw ad?

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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 appe5 l):g :r m4aw(+vtcxumpqe 9roaches zero, the capacitive reactance of:aw xc4te ul5m+m)r9( qv:peg 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 angleb ode7)137-pxqgtip k between the voltages of the inductor and capacitor in a q) peg71p3x i d-okb7tRLC 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 31ak0 et yt7* oxhlkb8k+vk4z RLC 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 circuit increases if R increaseb7bubne3e9f *owll)m m55 ge)s. When g5 9 b*ulwfole 7m35)ebbmen) 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 increma1aty i8h )n)ases 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 impedau m:ubnn ,eyw7lby,32srcy,. nce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cir59r fq6.w vewqa6prb 4cuit, the fbw6a pr .45v6qrqe9wresonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applua7 h q;*t(ft3+mr bylied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit omjdsy(12x j7y4v qgg0ct*0qpccurs 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 fi-9jrx/ k*jvx),c*t jfilu(v9+g qj 2jj2kfjy eld of 0.20 T. Find the magnetic flux through the loop when the plane of f,xcxr *jjv+*9y k2-j2tj lu /9q(jf)v jgijk 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 raddaxj .;9smy.e- if6r(zo-vk mius 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 ar dez- (maov.9s.; rikf-mxjy 6e 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 field of 0.mqiwy- jwbq0rn6sc5/ +0 )tg f20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field veg-+06q0y q5j)bft r i swnw/mcctor 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 slp vv dov+72i8ingle 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 changesr:l8*nn(ngx bmhhvg8-u7 l5 zuoj:+t 1tfx6z 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 frame with sides 18 cm. A * r4u-uwjifi. uniform magnetic field i*4- rii f.juwus 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 induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ogj3jda ya*/ l 6u;btup5h ,o0gf $0.40 \; m^{2}$ 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 weopc7 m)w3l /and area $0.20 \; m^{2}$ 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 ,i 6nn8 diqdqbs;/op -m flies horizontally at a location where the downward component of the Earth's ma;pii ,b od /q6-snqn8dgnetic 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 rk y*rv-48;bl t c-wtywotates at a constant angular velocity of 2.0 rad/s about a verticalw yv;ckb y--8*t4twrl 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 lo n;*yll +6:* kwle/tibldog; bops 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 t*v 53lpg t0wxeurns of 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 armatur74o a/c*yvs wje. 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 cw4/ya jso v*7maximum 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 wirer;l0 nh2y,5 m5wu jrgf 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 con1.omcegcus 7-struct a simple AC generator with an output of 12 V maximum when rotated a.e- m ccuo1s7gt 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 k3wn.lo;1y(r7mb m pr 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 6.0tozj7h 3.o 7ch0 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 al mq3g 9b2:m+urv2yth resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it ulm :g+tyhm2qbr32v 9generates 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 resistanci*o u l0do r 7eu2uibp*2vj53te 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current ie tp l7d23 uu5ob**0vi2rouj?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppwqg 5-nju,zgy*tn 30 hly. The operating current is 1.0 A at full spee0*u5 tn qh,g3wy jngz-d. 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 )bo - 38pmfeyqt9p5 6y8o8o:vbzbq+j2apsyr connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is tf8-q5 +89btos2yypop ob rmqz6p :j b 38)veyahe 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 nh-. nbh -51(zdfbo)f9 :trdz aaayg9 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 ofp6ru5lg ;9xq:a v* imbis*k8 a a transformer causes 14 A to flow in the secondary. How many turns are in the secondam i lux*r qp6kbs*a85:giv a9;ry?

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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 aowm/xc fd 87x,k4mp5 gre necessary in a 110-V primary if the 24-V secondary has 100 tux5g/ ,co8d xmf wp4mk7rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seconkfh+nl:s3ln+ * t4oaf dary coil. If the current in the secondary is 3.0 A, what is the curre34ao n++khsnl tff* l:nt 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 prf zl7e8e4gj bxxf-1obw.n -(c imary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary (g-8 1 xl4cbo.e7nj-ewzxbf f?

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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 1gx5x:)n d,ebq 0.0 mA. The primary coil operates on 120 nd5bxxg:,) eq V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns e.j1w 4(ivhu2lik ;aion its primary coil and 300 turns on its secondary coil. If 120 V at 2.jkwh;vi ei.4liu21a( 0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secodt nmdim5l.t9b4tme l1: 6tp,ndary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondarmle6t d:bt,5i1p t 4mdt. mln9y?

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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. osw li2gqv7ht 1ms e- isi*(,, If the input current at the primary is 1001,2eliwo(ihgt7vsq , -ss*i m 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 has 100 turns and its secondary cavvui0mcv,80g f 0hr/ hyk:)b5xko( has 200 turns. If the input voltage to the primary is 100 V, we can expect the out05bc)x8i g/ horamh0cfv(y:v v 0uk,kput 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 seconefcjc1z8e5iyx(6 x( qdary has 200 turns. If the power input to the primary is 100 W, we can expecxef 5 (c (yex1cq86jizt 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 usual*mq4;zu0 c vna hwr2:l h+x6wlly stepped up to 4500 V by a transformer and transmitted through a power line of totuhc h zwm*:4vnlla02 6r +w;qxal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage ivrf5,7gkhstc9k x3c ot87:ios usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage prk :htvf8c gt7koi ,cx s375o9ower 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 tr70u hck5-j/ c3w ksb/qsib3A of current 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 percentage power lost scb- t //ihw0qrs5k7ubjk33cin 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 resistanv, bqhrx00nva6r2z +f9 pwn3sce 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy woulds6v9arf+nvx, qrw0n z2p 3h0b 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 50hbakm3,st-s 9 km long has 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when btksha,s3 - 9mthe 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. adyi+ zo f08( zxhc:*hHow much less power would be lost if the power were transmitted at 3000 V instead of at (yc o zdh*80if+x:haz1000 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 is2hf0tfrn 6/zyu)i) cj 440 V at 20 A. It is to be 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 transmissionn)ti yurc h/fz 0j)26f 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 stored in th/h6k0.l ,ute)yve40wpaee ze e coil's magnetuw,le.ez6h v ee0tk p/4y0 a)eic 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 andl/73i9 b** a wckfdpaou,,wq l an 18-H inductor. What is this circuit9,of/ l 7q,bw3a c*a*kdwlpiu'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 AC circughkyv tj2i*(2 it 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 peak 91c)mpqp(lu b 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 lekmnt y;1(5 dresistance of the lam 1(ntmyld e5k;p?

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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 sby(( ihxs q89d) y(sudupply. What is the peak current through the resid yb qx()(y9hs( s8iudstor?

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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 coca(5nk crx e/8nnected to a 120-V ac power supply. What is the power dissipated /ek58 rnxa(ccin the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wonqr8 m5w y1 v1ms564o+tpuo fi6.vfq resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W;r jnzd 8j)nwm0zkf0/5cn; ,qxe fk 1g 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 resistor * atyp lg7ta:t77gbmr 9gw+j8is $I = 0.80 \sin (240 t)$. 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 ofeeqyp / 9df*o i4z+gh( co.8kh a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH gd(x) 12q2(ky eavcww 3/sgibcoil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance?17cwk rf o- z z*5mfrzwp)q2q:

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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 reaclf2 0f t59jnbrtance 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-mpzl:i y,mxvzc5r1(e c)sj f/4 xc-1olq6-p mfH inductor when 120 V AC at a frequency of 20 kHz is applied tov(,6j :z1exl5yz x q-fo lccs )1r/4-p ficmmp 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 Hzyy ;d7ub;ufx6 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 10 w1y3)7,0q o irwkcnqz 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 8ak.tn;h3(u mfld2ebp)l*s)mjn mk;tz 3w 7j 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 reactance ou8(9 o;vjvnb,l-d, -g sjqk wrf 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 10jy im(d8u8 r)0jx so6c0 W?j()88oumsdicy06 xj r

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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 5.5 *br5kfhyb6 dqy zx990 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 1h8sx 31j7ts faqfd v/6(+yrqj g m*1ew2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci hfr1g67xmdq/tq( ayfj +wj1sv 38e* stive 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 Hz1 n+4hdksr/0 vpw xz9g if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected vzs91/h 4wnkg+dx 0rpin 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-mH coil, and 14yr ,- ziemsp8.0-mF cary,me- ips4z8pacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serie c4 ywn. xnj(gbx;ubl(s-+*jds with a 20-mH inductor, what is the impedance at 100ud* (xj lngyjcx n4+;w-.bsb( 0 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 sev6yq3ydopwy k-eo a,mc ;+y .5ries with a 20-mH inductor, what is the phase anglo5a d;ky ym,oey.yw 63c-qpv+e 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 ns1*f5+lpe6 1isnpq npeeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500pss+n ni*pp1f q e516l 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 isq )00xot:rauv needed in series with a 100-W resistor and 15-mH coil to get a total impedance)xq uav00:to r of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz f8/ 378nf -dtlp 6uygv dxetiu,or a total imp tv/8 -x 7ud6fetdl,gi3uy8pnedance 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 1.093yka5ba+q n l4 rzkan-6 dwyo+j wc(4-MHz for a totalr3dn4 4kayb+yko(+569 wac nqj z- law impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with aewig:rt+2yj+kc fms9; 6 dg6i 20-mF capacitor. What is the impedance at 1;9g w+fy gk2i6d itr me6+js:c000 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 1xg ;,v5i3lkx: 8f k j,t (7gqkf,plxxe0-mF capacitor at 1.0 kHz for a total impedance ofe ( i5,vfk 37kqtl kxlxf,xg jpx8,g:; 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 wpwo rv8.lvv,ikp( s xzk/(o/2 ith a 10-mF capacitor at 1.0 kHz for a phase angle k8 spvv/.(voi,w/k( xz p2lroof $40^{\circ}$?

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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 kHze2pj2d l;- yal for a total impyp;2 lejl d-a2edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in ser y508tinqcvy+ ies with a 100-mF capacitor at 120 Hz. What is the phase ang5qv i 0ny8tcy+le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mHoxi ji*akq494 0e+ru i coil, and 1.0-mF capacitor areurq+9keiox*ai4 i 4 0j connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consis pgkhp (gc/fd5:bif,+ts of a 100-W resistor, a 10.0-mF capacitor, and a 0.35k+ (bggh5 cipfpf,:d /0-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive react,54h/ gbuotsn0cghy 5ance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cirn,cy5uhsbhg4 t5 o0g/ cuit?

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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 R 0aw h;v3 amrms23ryi,LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl irar 3hs0v3y,2 am;wmy?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a p1n:fettvb+i. hase angle of+v1eb tt. n:if $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freqcio+xr4xvr04+ k 2 wcvuency should the circuit be driven in order to have maximum power transferred from the driving sourc42 w4vckvro++xxr i0c e?

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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 h u(zsfzn ) 5u.yye0u27lff+lan ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacl uy2 lus)f f. fz7ue(+h0ny5zitive 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 circup)o s k.j 1b4n k6(ep9e;kxnbuit 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. 1fi c3dul0any1bhize 9 u,0o7 What is the powerh1bif 9id1n, ozulca07ey 0u3 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 circuit containing a 50-W reuq 1/putcn7+ bsistor, a 10-mF capacitor, and a 0.45-H inductorq1buctn pu /7+, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-3f sak 2nc,,aimF capacitor and a 15-mH coil in series?,3fkan s 2ia,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 needed in series with a 4.7-mF capatyj(8dvs. wd/-cs s3 kcitor for a resonant frequens3 d/sk j-(w8t vdysc.cy of 10 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 ias)v by 3:8a)q6f ngianductor for a resonant frequency of 100qiag3)n6vf basa8):y 0 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 plwj6zk -- pcx)o1fn1niaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of thc1znnw-ik )j o6p-xf 1e circuit is to be 1000 Hz?

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