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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 flux excep gan wl5p)eg*,e * ;l,dwqqsk2t

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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 inductio.) amebwf a ;j86gvkd3,lgh6c n 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 a coil produces what kind of change onioq 3n.cu abfr1o j4 yi,x7:7t the induced rauyt fin.o,o7b14x i7jc q :3$emf$, 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 through a loormnx15qdq*43lsn8h krj5 a e 2p of wire produces what kind of chang28x* rnqmsdl5 qn4k135r eha je 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 theey ru+-wzv8tp g xd x*z)hwxbb5u+(04 induced8tbpe) dh+ wy54bu v g*rxxx+zu0(-zw $emf$, 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 field agl7:ruqu l+f( s5ut ut0w 3ep6n $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in azsfxn+0 ste2 y2o+a m9 conductor will be that which tends to produce which of the following nfesz 9xta+om+220ys effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hel ut;+pw; eyvd xkh:/5td above its center with its north;k5+:h yvxt ut;d/wp e pole pointing 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. A bar magnet is )l1uxfzu8 pwdbn1 6g0held above its center with its north pole pointing down, and released. As it approd 0p 1u8wzlg)6xnub1 faches 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 field vecif,9t) uxgxug4 3lr7e+g 7k vctor points straight up. The magnetic field vanishes suddenly. When viewed from above,gg),fx r+k73u evigxu 7l9ct4 what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fie 6ej9piy)geax6w 9r a/ ,e9jlqld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in e6er9i 6ql/) aey9ajpjx9 ,gwthis 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 aa ubr)l t 2au2;sq4q0v horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fr;lbua0 tqa)4vr2s2quom above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizon*i- c,fz4gtaa +g 4od vado).utal table and carries an ever-increasing cu.*ziog+aoa4gc,d dt uva )f4-rrent northward. 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 nv op k r1yo6(tni ezcx:,n0 gj;x2+zkxel :z:)orth pole entering first. As the nortne 1x,c+ :k;pjz oztekrx2)g: no 6v(xl0zy:i h pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cogw a0r7tn+2x+v z 6ky)4: txtfxba,ksd87ri snstant angular speed about an axis whose direction can be varied. In a region where aygdsnsk:7wx vitt7zxbat+,2 r)axr k0 8f 4 +6 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 coc e,28 7jyoqegnstant 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 orientation of the loop's axis of rotation if the induced 72 e8gy ,cqoej$emf$ 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.e41zp ou5776yq8jqug ; afjqn
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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:,*ppgcl 6axvz3 k sh5k)tn/n9dii+ u $emf$ 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 fyow1gw ,q87g. uh.rr4oqzwl- ield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the e ibl6/+ 7.vp 3nudjmmbast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across dpnimublv/ 6.7b3+m jthe 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 roweey28zx/)o ptates 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 tra h/u.knnq6eu 2nsforms

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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 revoluti) egmlgmp)zo2 ,u ;)era v6r(qons each second. The frequency of themo, 26 qe)r()arv z;mg)l upeg $emf$ 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 d1.2 gr(4u h iygwtyw9used 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 devicex+/hh,, eu6fhmzq y)w 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 tetu: c7sgy qnex a)7(m0-yv 9vhe secondary coil contains more loops than the primary coil theme qv 9ae7nxc g)v(ys: yut7-0n 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 lod8yf7bklrr r : u*9 r1bx)a1caops than the secondary coil the: 1arb cy dfrlb u71x)*akr98rn 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 t g9+vp h uv;mos3(w2ro+/ dmdpower 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 resonant ci. -frpuvx f39ercuit,

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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 anj2tv3t5w 4ri*;hs)r js y- yxr ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossy;j*3th2sv5ijysr)tr4r x - w 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 induc-6 ew0f8 al59pcz7usn (nmvhttor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made u5p (cvfn8 enzw0t9alm67s- hwith 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 resistance1x)klu/4z renqd8(ef4c*z ch 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 resistawl;r msokg5,5nce 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 ifsnzsk 8ws q; wr vg;0k5b:d d81pcn06n series to a battery. The time constant for the circuit represents the time required fddk1s:wvg60sbkr s;zfqnwp8 5c 8n 0; or 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 connectey hqn8lhic*w *jo9:,p d in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr8 hi:j9* *ocnlyhpqw,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 have the vy5bxqd 8rnr6,7;t lasame 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 connect ea))u))qh0;jkovjlm 7 )0qel-gqrcxed to an AC 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 connected to an AC power sujo /i hcz.,(m0f i( ar3goaa)mpply. In this circuit, the currenz,j( f.maaor i mha0ci)( 3og/t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what m 6 xvcn:fei ,d((z.sefactor when the frequency ivx ,z6if: n ed.ms(c(es 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 mtism(j; 2z-/powq,f4l v9 iuvoltage across an inductor is doubled, the inductive reactance 9mv,l;poizm4 j(-itq2f s/w uof 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 ktsnd7rawlw)i r/4-*qi62n :l uc da.inductor approaches zero, the inductive reactancekl/a*:r42-i sa7 i6 )l cnw u.wtddnrq of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuhtw3, near( s* hf) a6pa)oxv4it, the currea tnfvas)hxr4o 6(wea*3h )p, nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit chh. ):o16 pu naw(yp,oztz0xfsanges by what factor when the frequency is tripl(pua)pz0wy ,oz 6sh:tfxno1 . ed?

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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 apprdsz9s1kqt.s+zq6w0i+ g +0 kma m)lewoaches zero, the capaciq z0+mw.ssi0k1kz6 9d eq a+w )ts+lgmtive 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 between the voltages ojpgql+*8*z(7-j b dbzb-x nyof the inductor and capacitor in a RLC series circuitl*j+g*(nbjz- d b- p8qybx 7oz?

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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 dbqumfb+(xa-l; s4 )sxefined 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 tjh10y0f8be8 mz (gf+9d hhcsif R increases. Whent018bhczfhj hmde(y s+f9 g 08 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 circ, vygrz/4 jl pefeu+3 wgm tge41(l2;euit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series d3 lln h*ghi-/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 caplm: 9 9d,v1 /poydflwiacitance both double in an LRC series circuit, the resonant frequency of that c9 wo/fid 9vlm1p: ,ydlircuit 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 applied7wff h5spa) ,xxo5 8qj 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 oc*wfr//padw j(pfn b+1curs 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 inkgvbv ( n(2u/t a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of t 2bt(vvgnk(/u he 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 xau9tc2u45m m5lj*eco)f0 xqm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thjxq0celxtmf *5 o9amuu 24)c5 e loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatil+c9m (yfdt c8bu8eey5r66- f0ex mmfng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn e+-mt9cc8fel5y0 d x6yf8u mm( refb6etic 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(y8vlnq t/br +8qc+qi of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coib;k6qp +aj lz4l changes 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 n d6g11s4x4i -l m ln.c,zwnwl200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicul.z6dnnin4g1mcww,- llx l4s1ar 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 of 3 fd5fpvh25yr,e+f bo $0.40 \; m^{2}$ 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 aeq9a mta7d+a3 xf :qxqfx5 .55s9l+xx epwmk 6rea $0.20 \; m^{2}$ 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 horizonta; (l5ejmk,ezxn+ am f9lly at a location where the kf;ejm ,5nx(l+eam z9downward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constanhj/+y hozkz;,t angular velocity of 2.0 rad/s about a vertical axis through one of its ends zhyj;,ho/z +kwhile 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 ha p1fr5 t1vk3ohgzf y68s 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirer6ml/ he:su( a 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 landmi t d7z(b4.1( tgn32idx loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotadx.3ati7lgid( tb 1zn nm4d2( tes at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 consistl8uyf lws:f :p6v.z6js of 100 turns 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 sikv9(nknztemr3 xn8jaz 8j* ;d)8;: w :dqqajo mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availqvw(;q)d 8dnn9a: m8*zjtxk 8ajnk rje:z;o 3 able. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximx;e3wjpc: ql 8akg*e. um $emf$ 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 motor operates o+oc(xy-xcq d fx:gz yd:7 :k1in $120 \; V$ 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 resis: biy*822whw fxu g9byewbg+*tance of 6.00 W. The motor operates on 120 V AC, and when r*9w gey bhfu28ibxwg +yb2:w*unning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powgq)9 kevn-s( wer supply. The operating currq(w-9nkve )g sent 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 resistance 6.0 W is connected to a ;adso mdu84+w (3bthm 24-V power supply. The operating current is 1.0 A at3+hmodm4;a t(d wbs8u 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 6r))z 2hsre1l3qg o7+u keoo-y.0 W is connected to a 24-V power supply. The operating currlo 13k g er-qo +sz)yoer2h7u)ent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a r ,xf0dx( co09wo nzp:primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secon2n m y*cqe8)usdary. How) ymcs8quen* 2 many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary. tk.63p/x0c tlqhj wx if the 24-V secxjhwpxq/. 6c.tkl30t ondary 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 a 500-turn primary coil and a 2000-tug2 s/sxhhqm72,wkapgyz(w x i:bo*-p+ -7qhprn secondary coil. If the current in the secondary is 3.0 A, what is the curreg : kp-+p hso2gix7hp -qsmq2yxh /7wawbz,*(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 primary of a transformer. Assuming 100% efficie54f yg,qo 8.xuyy a5ntncy, how many amps at 24 V can flow in thtf8yaoxn5.g4y ,5 yuqe secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign t2 j f)cu j4v*pe1.xc:frg ;rdsransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 Vu*:.dvrj fe 2 4)1sp;cgfrc jx. 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 on its primary cx0df w1jtsoj ty7-/4toil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 0- jd/wyt4jst17 oxtfto 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 zhojq,7a hgns/ve*/opy0r6o 60 e ad3on its primary coil and 300 turns on its secondary coil. If 120 q vy 06*ogr0s ada6 e,noje hhp7/o3z/V at 2.0 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 en afm* s2 3t*wlf022umkrb. usecondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary tlfnsf*3*0t2w mk u r.a2eb2muo 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 clka53j.4 ,3v go+wku- e yhyqhas 200 turns. If the input voltage to the primary is 100 V, we canwgv3qk-ky 3yc 5+ u.a4,hljeo expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns anxo l) 4t0f9mze3 zyys8d its secondary has 200 turns. If the power input to the primo0m3 y zlf)e4xt8zy9s ary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60rd 0tr 1ujd198,oge3r6 iv pgk 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 total resistance 1.0 W. Find the number of turns in the secondary if the primary hr p9urt13 gdr1je0i6 okd,vg8as 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 x r p,hox6w1,kv 1qigqu5qf*- current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resista o6-q, pqvu f,whgx*x irk511qnce 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.p r3kf +fs8cri l6+tu) 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 transmission line if the voltage is ns frt863)kicuf p++ lrot 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. lc 6ygvkwu*-7 A generator produces 100 V at 70 A. In order to reduce energy loss due to heatil* cg7 vkwu6-yng of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 506 cy6pc gi *2vyt8,mmq7: phmk 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 voltakhcc8v2piy t*mg m6 my7p6q,:ge 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 less power wouxa f1ad:0 hy0 vkrm/x7ld be lost if the power/:1kv 0a yxd7x r0hafm were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatyalgvwuu6 5c2j6 k8)tor is 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 transmission is not to exceed 0j)2uatw c86lu5 kvg6y .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 ener+xp4f /( (vl(o *hzk4jy dpiksgy is stored in the coil's magnetic field?hp( 4ydk/v4fx(jokp *(+si lz

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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 ,yg bfcgwgi6xmhzsz94* g*)v 7q:6 fga 6.0-W resistor and an 18-H inductor. What is this circuit's time c*qg v 6c*gy ffsghwz:69xi) 4mz7g, gbonstant?

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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 a51xpeh,.q n-: ;feeshf2tunw n 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 eqrc*u0j6a 1aa 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of theb j39zlvy*xj: la ljjvby3:* x9zmp?

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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 t 57x bzm8ddvp5he peak current thz5xdv8p 5 bd7mrough 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 connecte gn qaecck dv*t9b- 9.ph8k s*bj8)0tnd to a 120-V ac power supply. What is the power dissipated in the resis0 *ba c* 8h9-9cdp.8 vknqjkt) ntgesbtor?

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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 res xsq7xhp:.d 8m4ce wr2istor 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-n)ptiacadjhh0kc 5d70, t*9l W 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; /si5mxylc-i 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 inductor atdu86tkxkx 0 r-)3dnie 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 reacv)44ky5 kg/h j 8nyrtitance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-m0pr/2g roc -hsH 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 reac+- alb n;9.yla ljqnozai+v20tance 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 ACi loz.6:w)qipu2 p4 wlylqi36 at a frequency of 20 kHz is applliowil .p43zq:26iuywp6q) lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,j rz; /f2.3vrg x 9nc0fzzngt;o,cl:c 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 capacitive reactance ojbbk g/7jqmjpj6d(a:chlsi 8.f2e: 3f a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactanc /a+yqx;n i4kte 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 hlc;)lq+ (yl6 wh4gij oave 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) pm* duz.6s5cjki jy. the capacitive reactance of a 0.010-mF capacitor be 100 W p 6j.uz.s5*y)kmdjci?

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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 throughdv 1, zph60sal a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac ;w immj3 cbnnj+-c2 5oseries circuit with 12.0 W resistance, 15.0 W inductive reactance;mcncb n3o- w 5+i2mjj, 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 15i8k cq e6g1/pu00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are e6qc1gui k8/p 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 ch-xl4a+ tbpf9x8 b; x4gbg 3lkoil, and 1.0-mF capacitakb3xgt4f8-bx 9l hg;bp4x l+or 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 series with a 20-mH inductor, wha)dg; jcf7 a. qvk-x2kjt is the impedancekqx. -2kajg) ;fcv7jd at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in s8alnlc q ,y(d0eries with a 20-mH inductor, what is the phase anglel ,c(yqnld0 8a 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 i3d/kmu x :ih-a bk26p1c3bta series circuit with a 20-mH coil and 1.0-mF capacitor for d/tbp6bka1ick u-23miha3 :xa total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistodk(7v3wgr q;9ucw o w:r and 15-mH coil to get a total impedance of 110 W at 2000 d c(9gw;u7 ww:vkrq3oHz?

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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 in.xwefmu n(u: w:d:8ssvkni-; ductor at 5000 Hz for a total impedance of 40000ik ( nw.v-:nm:;dus 8ue wf:sx 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 ay 2pi+s y sq :2mz )wqdbvjyhl5b:,r96 100-kW resistor at 1.0-MHz for a totb:idy)lw:qbhyprjy q 2s 92,v5 smz+ 6al 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 a 2a1,n + tfx*yyfzrl ,a*0-mF capacitor. What is the impedance at 1000 Hfl*,aa+ zrxyt* fny, 1z?

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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-mF capacitor axyp 0v ae388wqt 1.0 kHz for a total impedan vapy8 xw8q30ece of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phazh+41kd 9do b, ul)rj(.tptw ese angle of l (9kteb,uzd. oj1t+4p )hwdr$40^{\circ}$?

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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 j*t3f 0cc)o ;ua hxel5at 1.0 kHz for a total impedancee l5 f;hc)tx30cja uo* 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 series with a 17itsoubdw0 +z6pb0zs pi94 j 500-mF capacitor at 120 Hz. What is the phase anglezs 64ub+ zi0d7p 5tjbpi9w 0os?

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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 p95ftn qndr 2.and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacidnp25rtn.f 9qtor 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 consi cx8*qzy)x1t ,o pfk9ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. Tqxy xf8ko 9 ,)1pzi*cthe 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 nf.f 4vi(.yei capacitive reactance 30 W, and an inductor of inducti in.v(yf .4efive 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 cirvzv36,z dg/ rf6p0x jucuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H 6x r0z,j z g63vdfp/vuinductor, 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 ;o72opksqsq0( 0bvl8 bkv bu.resistor for a phase angle oqp ul7 s bq;v(bvk.k00o8bo2 sf $40^{\circ}$ 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 m7(.jenuazt/ xw 2w )q= 10.0 mF. At what frequency wue)wn qt/.(am7xj z2 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 circuit with 12jl 8/b:x qel42 te/voco *p.mn.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power nl.bx 4t elo/8/ovjpmc*2 :q esupply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is5n y6o tr2hh c*0lor*f $63^{\circ}$. 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 clqk/qu1( / ilW. What is the powk /c1qqi/ul l(er 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 circ/xvli.9g1 hbo uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected /1l h9g bvi.xoto 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 x jres 6ilo12y)qnln;r3c++ c1.0-mF capacitor and a 15-mH coil in series? 1 jy;o+lr6l3)sen+2rxcincq

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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 capacitor for a resonant2zr; b lxwgfr8 1uxypy*hc ii4 /v;9)o frequency ofzlwoxpy)i;*fc928gbh u 4/ir v y1;xr 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 id8mj ug7skm .05o6: s eg0kgbneeded in series with a 3.7-mH inductor for a resonant frequency of 1s587: emmsjg6kdgbu 0ok. i0g000 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 ip9fs0 b a e79mgv: 72hekee:h30-W resistor and a 40-mH coil if the resonant frequency of thef9 vsg 7 e 2bmh:09eipe7a:khe circuit is to be 1000 Hz?

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