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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 magnetic flux exqc:fp9+z ow-y54py g ycept

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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 statesj4ps ks53ldhg v-s+e* 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 7cnifxi ,.h z-of loops of wire in a coil produces what kind of change on the in7hi -,. cinfxzduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field througvojuxg0 o14 qf2x1,pi h a loop of wire produces what kind of chpguioqxf02 j1oxv 4 1,ange 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 o)tx2u1rm/ lnb,f0 ineo *xcw2f wire produces what kind of change on the induced )o22cb*enxn r0i/mu flw,1tx $emf$, 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 frommc 4xl;hqn c:ny-g5-l 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 direct rls*gk4x sr:3 ufnx10ion of an induced current in a conductor will be that which tends to produce xg34:fl 0sus1* rr nxkwhich 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 hobfikxfic s8tp:3u/4e+i+ b 7zrizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from bi:f ec/tx +7pi+zfiu k38bs4above)

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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 d9bjx9ua-hl4on a horizontal table. A bar magnet is held above its center with its north pole pointing d94j dxu b-alh9own, 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 i.5v ;xrg7k5h.vk ksov n 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 cuhv.gk.5 r5kv;k sxo7 vrrent 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 m3,.2 bqh)fijxbe.ns a agnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ofx qba.nfibje2, s3)h. 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 tabxv*il7vf jj +0le top in a region 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+*7xvf0lijj v 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 azl--- y 7oabdkf0dar x:4t5 hpnd carries an ever-increasing current northwardd7-hyl:fa 4xb0 kp - tz-5orda. Two coils 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 n. tj1u;+qh.xk 05ol ku)f frlforth pole entering first. As the north pole enters the wire, the induced currru1fk xk+fjoq;ul.5lf0th.) ent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abok jl.u +i5m*xuut an axis whose direction can be varied. In jlu5ix+ uk*. ma 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 speedj1 :cpo -wf xw-)ev4 jhu xoyn4)hs*:q about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be tph-:)w*-4ncwj h :xx )jsyqo f uev4o1he 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.q17aevi a (su1*,-tejfqn l3g
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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 w-hh, 7lmt b1qckd,4el u4d*ran $emf$ 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 rc//wew f4 f4rpmwd8 ,$emf$ 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-weigp 3 .rscae*sfc9 z91st direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a st p.*z1939c agiecssrfatement 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 rotatxu pwdm0f0 ;0qes at a constant 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 transfori fo*u)t*mapgyl rw63tjq*97s 2m u+kc w 7,cmms

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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 freque cr ugfl*)klq5gnm2: *ncy of the*52mul:r gc* k)ngfq l $emf$ 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 dev,y b, v9+cfqcflzg*z h8:u1gp ice 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 t y/*yq3 .h 3o1cqgrc(zb vf.n my-b c+ktbj(*bhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primar) pnl6+bvm xz//w e2cny coil the 6/z /w+bpnme lnc)x2vn 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 coil contains more loops than the..ijc x5 ) ganoj6au3n secondary coil th6c3nxga.ao ).ui jjn 5en 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 ioxk*wq63voi)z1i 3v bn rte,0nput

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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 cirhj*68winr73qsk bf +pcuit,

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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 indu;hxm ahf//+q: qtj8gkctor are connected in series to an ideal battery of constant te/ ;+:qhkhaj8m fgx/ qtrminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are nf.) sb:mq .atconnected in series to an ideal battery of constant terminal voltagem.sfqt b).: an. 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 tx i 5lw.bod4rm1y;qo:-d6hk do 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 connecteu ,1- )yc m,dixay0vnfd 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 afs8x hj*d.u5 (h- cydg battery. The time constant for the circuit represents the timxy -g*8cuj( dhh fsd.5e 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 pv9uq82xuo.qt9 hxx; u( kgdu/e8u/ubattery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr/u9g q.quuhxou8(x82xu d epk9v t u;/ent 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 h mf8ac8p-hkmc (e/:t p mt5v,tave 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 AC power suppknqsd t6l0f( vag /5svu.n4;rly. 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 connected to an AC power supply. ),jp 95 qjrhyk In this circuit, the curren p5qk)jh ,ryj9t

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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 chan5( zpwr hatz,hikkn8n 725st :ges by what factor when the frequency is triplep(ta2h zzsi:t8kh55, 7rknwn d?

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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 indu7x5zgmv/;afe ctor is doubled, the inductive reactance of thvemf/g75; zx aat 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 approach,uw*asik m 1y2es zero, the inductive reactance of that csmky1a,wui 2 *oil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, th4udo:3t(w0 p r yuu.frrw/:zz e currenuy3r:uw rz:td 4 /fwz 0(.uropt

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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 whencr1-,hckrdoh8f *b; lz3k6 ce the frequenco- hhd 8,e fcbcl*z3kr ;16crky 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 ac.; 0iz,o3ab q kc1jqrkross a capacitor approaches zero, the capacitiv.;cr,b aokzqj 1ik0q3e reactance 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 betwee)sz: c,)gxfmv 85(mysn ij+y xn the voltages of the inductor and capacitor in a RLC serv ,5 zyynxmc)fgi:x()+ sm8j sies 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 anvaf 8kc 9t2gyi0kigd k: tl795 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 increas.vmo :fm04wltcby v:9 es if R increases. When isl fvm:0m:9w yt4.vcob 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 increa q:ta /cg4* 2oc :li5norzvl)ea yum09ses if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inxvb)e a1v 7*vdcreases 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 circuit, t*u 5ew/kjs:gs +wyklb- qh:r *he resonant frequency of that circge -kq :lskhb+/: 5ws*wj uyr*uit 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 appxo t;rcztd:vs+ o3 42 nuko;e8xkat *5lied 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 occug jz;hu0( 1ilqrs 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 if.n8czbv sw - jq jmb0-l )twwdv0*32ws rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh*0bm2bw)vwc -s83. fzjtnwwq-dlj 0ven the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn rnz7x3ixp+z) etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetxz +7x )in3przic 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 ri ky2v,70 ktcwadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thyk,07c kt wv2ie 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 ioxp/dra i281 s 87et01ixqbireduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from :x 7 af lgzi9iz-,m5yiriuk2 )i1nh-. d*hemn$4.0 \times 10^{-5} \; Wb$ 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 (: gg7zx y0wmq(f i q;b14+qzil+oqqf200 turns 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 q+i(i0 :w 1gxo47qqm(qfb zgf zyq;l+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 turz 7ij7e4 kh3ns*0w,ange+kxl ,cuv9 k ns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ushq ni xnl jq6z 48v44x46b9ejrrh8/ 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 spqrt1 ), jne49e ftt-bsan of 60 m flies horizontally at a location where the downward co9,e )e-rbtfsj n4tq1 tmponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates ap xdpg r. 8kva 9j*fhlq4h5-xd9ef1t9t a constant angular velocity of 2.0 rad/s about a vertical axv1jkl9ehxxrp* df 4q d9 hpaft.5-8g9is 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 loops and a cross-sectional arn tsw6d5l-qg, ea 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 tug 4ghxtz;r66bk3i gp*rns 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 armature. Eac kdu./hwlr:;tb hz,8mh 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, whau h,m8;wrb: h/tdkz.lt 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 bo0yp,vt sa4mnlr; e7id1* khk 8kuw;/zn /*pturns 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC glyne9h 3hs*l 3ryj(tn(gse 2; enerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil9h lnynh 3eg;2(re(y* s sljt3 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 gener,4kjmm 0)0iu ua:show ator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mo jfl:l vkz8a 4iclyw ui:mv2 86k:.no+tor 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 resistance of 6.00 W. The mom p/-n3oq-9zy5q -ujval. fivtor operates on 120 V AC, and when running at full speed it generates a b3mv-5l-9i -poz . qyfvujaqn/ack $emf$ 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 37 v25f mrrfwesny k6wkm*r3*-V power supply. The operating n r3sk5v27rey3rw* fkw f*6mmcurrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista/p n9 g*.7znndutjog7nce 6.0 W is connected to a 24-V power supply. The opp 9/nozugt nj.gn77 *derating 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 connected to ad pk46 6pj( ;ng9vt.didz;fd a 24-V power supply. The operating current is 1.0 A at full speed. What jp4g d;dp vit;9d6.daz(f6nk 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 pwfo-;ez ow j( ck3gp:8rimary 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 ofqvj).pkixaq *e6 gktp4/w4p/ a transformer causes 14 A to flow in the secondary.ptj/ *xpw) 6 p/4gqkeq.i4avk How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many tu3ywv2, e gxcua oh7y:l37 jku2rns are necessary in a 110-V primary if the 24-V secondary has 100 turnxo:aylg2yj3 7 w7v32,euuchks?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consist1nite. xaa(x9s of a 500-turn primary coil and a 2000-turn secondary coil. .e 1(xa9nat xi 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 the primary of a trz d7n)6bk 9mt/ 4u-p dvd vue(c:anlp0ansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondandn7-upkd4m(p9a:ctvd 60 vlbe)z/ury?

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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 7vfx3kl er ,xupr38qh ak7n:4bz+r0-l 500 V at 10.0 mA. The primary c +lxr 7-,0rp84fb3k zhx:e kl3vaurqnoil operates on 120 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 6o;comp4 hui(.z mu/ )j0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied topc;4mj z oiuh )./mou( 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 an0b.b/izdhgc xxm6*s 8d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presen/bms0g *xd68 xzhb.ic t 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 *ya7imngmplz0.; vc1secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seca0pyz.c 1m mgv *;in7londary 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 gpwtm 2r20ymxjm9l0 4(bbm ptu s)68h 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 the secop )0249t l phxty6sm(m2r8 0bgb mjwumndary 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 tux9s/2c49o0zqi n ufy frns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the i94s x/qn2ycuof 0fz9 secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedhf90v 2i +pi w ;o/ibwv-+jwu+p9cmg m up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbeob9c wj mvihu+ ;m20/ip+g+9p wfvw-ir 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 is usually steppe 8jsv91ixvo5vfo;5e f d up to 4500 V by a transfor jfvvo589 o5i;vx1 sefmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current yasdl9, e5-n oat 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 in the transml5y,nose d a9-ission 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 re;csk uwp6 3w wvth 8/eoi92ld2sistance 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 pervwtehli 3 2pw6 cs82oud /;9kwcentage 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 genex;d+ ek7uea,6bslu 2( (wpl berator produces 100,x;e7 lw+es l(a 2bu uke(bp6d 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 the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lesar)pom(med .l y7snx/u kd ,x tau392*s power would be lost if the power were transmitted at 3000 V instead of at 1000 deyu .l 7,px(2*)mko /au trnmx 3s9daV?

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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 2o5h+:dv1sf vv 0 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the gen+sdo 1vfh5v:v erator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ener6p l7z963au frqn0k argy is stored in the coil's magnetra6kn37l 9 q60zupfaric 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 resisto-jg j );5n zg)ol98yf(kz htvwr and an 18-H inductor. What is thiszy59 nl-g(ztjkhjfw ;) og) v8 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 in an AC ch;(d3zr-n q dzircuit 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)9:qj)nmbl 8uk 6tm.; ihtrcm 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 1 bzbpno03n 1hh2bale/ ++ gjz,20-V AC outlet. What is the resistance of the lamh o z+b gbaznen1 j3+/,0phbl2p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak r 3 q6br,bp30(ppspc*zx1 dfxk;xm2rcurrent throughxprrcr2 b(, f3db1xq p*k p3x;mp6z0s 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 ac power supply. Whq 23n5 h*blryi1(mkdxy3(ffe at is the power dissipah33q*ryb2f (( n1dyk mlxefi5 ted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r 71o nsyf/o-7ho+va9knv77;vyknn xmesistor 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 resis,58h0uo3k f( sgqj uzui)8owttor 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 aafmn r m*;h9 gae8d6p4v0-n0ulp ;lea 50-W resistor 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 in d41zjx, orb/ tochs9:si/b8vductor 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 1000x1b0,j*d 9iov-kjxke 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-m,xz;we qpjz;82er)kx0 ebba2H 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 nnt18nik2 k075g.lpphwsr4 r for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencyfxlmai1g 4zlt 80m7qjp27fz. of 20 kHz is apfx apmi7l1 tjmz8 zg0q.f47l2plied 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 11e q mv9;5g6acz0-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitiv +dggj38-qz;,u ik 47zwttlw r. (bsore reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed tqd5mog: x)xz7 qqu n zr(7p f+3gfm8g/o 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 wfefx r-r7f6 -c/1y-h7 hm ll xphy7p510-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 a s*yii/v4/se100 W?s//e4v*iy isa

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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 cardu.s-a 2 3a b7rj8jibpacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 129w;-i2 - ap scpfil8w7 f9:noz4aighk .0 W resistance, 15.0 W inductive reactaalia:p ni8; s w7fk9h-zcg w42 o9f-pince, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.fl a+k7dz-7nc2 8byo mrxyf4-6.zv hs0-mF ca ykdl -.z+vxz m67 s8aof-7br4n2yf hcpacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.;n p4yz+20nipnad ll8 0-mF capacitor are connected +8;np0nln zapdiyl 24 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 is the iho- 9fs) ok*)2bov4wi a dzgm++vquc/mpedance at 10 s-)i+kab+/ oz uhwco mo )vq2vd94g*f00 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 resistorg6 lktu 5ud**rmq. sw; is connected in series with a 20-mH inductor, what is the phase angle at kgl5 dwqm6;s *ur* t.u1000 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 and 1.0-mF capa0k79 m odm*qe-09ov dx dah8jbcitor for a totqvd9e 8* jd00hkb 7oo9-dma mxal 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 cafc0q ok r6lt95fuw+ d1pacitances is needed in series with a 100-W resistor and 1t9ldr5+ f1 o60 kfqwuc5-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put ;7 k *igeyid oo5,jn)lin series with a 450-mH inductor at 5000 Hz for a totaegi ;do*ny,7oj k5li) l impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in -s*d hb9/ nfcmd d):up1qoo8 c aa6v(lseries with a 100-kW resistor at 1.0-MHz for a total ima 9al d/d nc(qdmvof)- pc8osu*6b:1 hpedance 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 ev+ch 3n35rkhseries with a 20-mF capacitor. What is the impedance acr5 hkv3hen3 +t 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 serimqg)h2ggvsh qqm/ssf,l + 7 75es with a 10-mF capacitor at 1.0 kHz for a total impedance of2sqgl/g5hf,s)+hmg7v q 7 sqm 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 i0ppwds c6i skz 4z88u2n series with a 10-mF capacitor at 1.0 kHz for a phase 28pc6wzdupsi0 s8kz4 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 seris q1ddef*o 99ues with a 30-W resistor at 1.0 kHz for a total impedance of sfq ud99o1*de45 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/nn sz8dcx 9tp;y+qo,xl 4oo0 Hz. What is the pha4+cyx9ol8/ o0;xnotn qd zp, sse angle?

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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 11 d o/a*nq8lyr500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci ra8n *doy/l1qtor are 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 consists of a n,leo p2pc4vx-s3w5i e+b+u i 100-W resistor, 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 i+pic+2xew sbvol p5e4,n3u -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 capacitivewoi:lq11cyx 9 reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-H :qc9y1ox iwl1z 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 fo sfiki43v+ 6knr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-i+ns43 vk 6fikH inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase 0aduqt ier66z;1(nwd: kdf1 q angle of(i 1: ekwqun1aqtd6fdrz; 06d $40^{\circ}$ 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 = 20.0494h ohx g( 4nchtag2c c+0vaw W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferre24agtwxh c (4 +9c4hho avcg0nd 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 outputt x2bpj3 ubi5xz.m2.z in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the jm.tbz2 xxz3i p.b2 5ucircuit 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 hvlii g9o1y5b4b551 ( .j7yd rqtcwwe circuit 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 circuitjc)eet/ko m ; jcy agy)11ez:) has an impedance of 60 W and a resistance of 30 W. What is the power factor?/yk o1jege)ay1: cc mz;) tej)

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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 factor1tno .1urfy k* for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60- ktnuf1 *.ryo1Hz 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-mF capacitor and a 15-g dr5j86j wbdz /;:lummH coil in series?d/gj; bju6r8 mz:wd5l

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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 seri.r4 ie za5rtq 7gpo:1ies with a 4.7-mF capacitor for a resonant frequency of 10 kHr1q e.g:7z r4opaiti5z?

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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 indu1c7ehti ir gj3;p+k( wctor for a resonant frequency of 1w;+ 3ki (gc7ijthr1pe000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor :p 8xm5x5 z9pju -jlcaand a 40-mH coil if thl58 9: zxmxpjja-5u cpe resonant frequency of the circuit is to be 1000 Hz?

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