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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 magnevg4tmpht : 2x6qrgn;a0y7 .xptic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction sn3sr76ucin + itates 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 l6v. g -p,m. szxmp9scb//doul5kz u f*oops of wire in a coil produces what kind of change on the indukv.x.6/pspzdgm/ zms 9 lf*bou-,5cuced $emf$, 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 loop of wire p:k. 6aytx6 negroduces what kige n x.tak:6y6nd 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 ,6x dohjnf+wz ;28;ixy(mv x aof a loop of wire produces what kind of change on the induced;+wa; diz,nm6h82 o xjxyvx(f $emf$, 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 an sl:bfn 9ok0m ,$emf$ 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 ik ;xgwpfo04;awj 1s *dnduced current in a conductor will be that which tends to produce wh0jgkxf1;o4d;aps* ww ich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne4 ( n8x 5w9lmtg4bay(cx)anq1 yiqn.s t is held above its center with its north pole pointing down. The st( qanmt4(igncnsqyxlw.418ay )x b9 5ationary 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 flatcv7fhz q .-la( on a horizontal table. A bar magnet is held above its center with its north pole pointinc.a vh(lz7fq -g down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table to- +y x,urwbt/xp in a region where the magnetic field vector points straight up. The mw,utxyr/bx +-agnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiegam 52b.t xucsq 1lwr;r8+ 9zzld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is th x9r5ms t1a;l.czq z2rgb +8uwe direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal t ;7fv ady;abqo)pf1-j able top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whajybq f-d7o;v;aa1) fpt is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries(i*vsu. s 4(xc-i- boyvttu3k an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side ovi s(vibtxuu- oyck-ts.4* 3(f 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 witvf w/ik lcu 0 7qu.4w3x-ssq-th the north pole entering first. As the no0luwvq.-fqs 3i sw/u-t 47 xckrth 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 constant angular speed about an axi0/qshzrp fux06 l*d9/p0 cn gzs 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 inducedflpr qpsz6n hz/ /u*9x0 c00gd $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis o4g7ilbh 47 a/mdz( iqj9t7sw whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the i olsg79 i77h4zdmt(bajq4 w/ 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.zno(-/) nh5i ktus /nqqe+n +y
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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 thath0ddy.b v.nfvh x7/a, 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 magnetic fielms6hgba+ol/c3dx3i +d. 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 d(o 0 cvs/z9zzj)4 (ypk ms)fain the east-west direction) is moved northward at constant velocity through a magnetic field that points straight do0j)c9fvzoysp(/ (a 4smzk )d zwn. 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 constmty7ou4g cnb,zo*0 9dant 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 tr5pi g4v nt+d pm7qm(.uansforms

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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 sg4 kfbh-z.w3 lfls,1qecond. The frequency of the - kb,s3 ff1g.4lzhqlw$emf$ 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 us8fxuht( hw ap6 uq61p6ed 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 devs:9r 7vz+b*ucg ( zmgiice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than cs/uzd3h- 1af the primary coil then it iz/-fscuhd 1a3 s 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 u 8bext0y; 3/jnti*tdthe secondary coil then it is a3jty;n0x 8 eibut*td/

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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 powere.zx/mvzp rv02 q )21v(ws kfx 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 circuit,puy qnhbb7)6tze4f+ g1a9x ;v

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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 bat,jl ygxjl j2n/2xj8)m tery of constant terminal voltage. ,n g/ jl8l )22xyjjxjmAt 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 connected in series to an ideal d7hcg x6 :bjzrxnj 6,88lc3br 1 j/tribattery of constant terminal voltage. At the moment contact is made with thedlnr cjjz6b 738 /18jth,6x :gr ixrbc 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 inj;m(pekas ll 28pdae-3x l*h8 ductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co*,h pz qp4b,ilnnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The 2 cm9rhbf lq(s*y3f(, ykquj1time constant for the circuit(h rqf,bum2yyfcq9l*j1 k3s( 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 c88lgry 7rhm2connected 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 current to dec8lm crr2g87yhrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except h i5hcgj.3hz:o 0i3aw:

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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 circuit, t1r h-eksehm (+he 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. In this circuit, the cucc4 z -wxa (.h-/v1yhn yeucr1rrenta-(ywnuvh .1cxzhe -4cy r/c1

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan wbl3* eam,w5m6 nnlm14aa ss h;a(ib0ce in an ac circuit changes by what factor when the frequency is tripled?s43 lw1abbeamhlw,m( 6ma*n in0s;5 a

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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 s0e99mo /qq jvpp+u6 othe AC voltage across an inductor is doubled, the inductive reacta99vs+p60oup moq / ejqnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approachesxw9g v4a 60btq zero, the induct q40vbtxw9g a6ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this sn ziwu u6+x:*circuit, the current:s*zin +w 6xuu

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactarnrt(0p fo/uy e(x j /j*bf2j5nce in an ac circuit changes by what factor when the frequency is triple/ x*rj5oe yn((rt/pbj2ujff0 d?

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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 acrekoiiwwy791 g*c;yg8g, ld f 4oss a capacitor approaches zero, the capacitivegkyiw8iggy79 ; 1wocfd le,4* 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 of the inductor and capacitor in 0b:3zr6 -vufpuo ucz*a Rz-fb0r:z6*u puvco3 uLC 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 RLC cii -9 3kawaaf )bf. nvmluh.s7 (9qv*lgrcuit 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 ifccx) l/henyumq/7 b e0g(u/(e R increases. When is this statement true(0exy/eumeqgnc huc7 /)/ bl( ?

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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 imp7bu ltgsot90,,o,da /; tvxogedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circui8*vsarprbimit.hhbr cg*i6( b6f + 41 t 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 fdz (i xrw433-vw:ni 2xbk si6an LRC series circuit, the resonant frequency x3rx(vd :43n wb6iki fis -2wzof 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 t+k 0yj yi;eaxo kdn1+)hat is driven by an AC applied 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 RLC2f-h b:*bkl4v 8lxro gr4gty) circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m isu*snsdt 0 -mxskbx-5 7 rotating in a uniform magnetic field of 0.20 T. Find th 7- xu5mxstbksn d-0s*e magnetic flux through the loop when 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 magnetic fu e5ie :pvqe(bcv7w. /ield of 0.20 T. Find the magnetic flux through the loop when te5wbv7.c:ie pq/v(ue he 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 rotating in a uniform magneticm :l8x*9 0k;exwl btnj field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anglemx:ntw8eklj b* 9 ;lx0 of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frm bv(zby +/*a5isb 9uwom $1.0 \; m^{2}$ 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 cq kl179b+c lmbhanges 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 witugv1h,p k+3j zp-u lwg*/okp*h 200 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 0.50 T to 0 in 8.0 s, find v*/,k h*k g p1-pwl+zjpou3guthe 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 turnsz 1c hxox0mn+ t(yi9w* 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 ar 5)pu:cu9rntosma-n,,)sp rl ea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizoqc c8+ilm3m8xw op -/b/fr,iyntally at a location where the y,cmm8 q+3/wf p-ci olxr8/ bidownward 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 2crb 07)fdi6a4ru 3xbuutxir; ,s4o 1z.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one o4a)bbud xutsir3 06xz,7o if r1r4u c;f 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 ) q ec.ui;u8jm1np1k7eszn/ y area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area c8hj0wx/t b3s $0.090 \; m^{2}$ 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 l06xcu4a9d+vo5uxb3kjo y :cq oops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum oqau:v+x9c jd 0x6oky3uo5 4c butput 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 consis6o:drdkqn*e0l l9c2jf) i 0 t1 r8irggts 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 simple A ,c1 uh*nah7ft1jvy0jC generator 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 rotat7 t,jc1 vh1fua*nh jy0ing 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 maximumpo ,vokfdbfd.;p/ i)dg x-0)yjy1 e i+ $emf$ 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 res2 *::yfa9 gz.u ijhnktistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opepbau ql5 i9gh++u(l5eqv5hh( rates on 120 V a5hv(lg (q9i puhuh+e 5q l5b+AC, and when running 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 coiw3kbj*9u.e/ )s t abbnnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up3 bki/9)tbb*ej.as wu current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplys6h3;i r z-cc9n(yhnd. The operating cur n-sc(6hir;9dc yzn 3hrent 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 a 24-V power supply. Tkvha4e38 t/derla: ts(,o3di he operating curds t3/:3vto4(ha8r deka,el irent 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 .yy)5i6 qlm wra 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 te i z9(a3jk10grm-1ji ln2slwhe secondarw-r2le(z iiksn 3091j1gmjlay. 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 turns ar1-p:jysrvaa pc m6f8 ky5.wf4 e necessary in a 110-V primary if the 24-V secondary has 1004r6-sw 8 cjv f1ypam: yk5af.p 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 50 6y k*s(qgo9n20e ydmv z6re7t0-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thezs r69ny 0do7 6qvem2ktg(*ye 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 flowsqgq4+ p 735roc3 zzcja in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?3 +q7zc4a z5rcjqgpo3

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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 prw+pza* e3 rp7 svph7nxb8lk) ss;g);3 0y amafovides 7500 V at 10.0 mA. The primary c7p8gh zws ;kl30)7+m snypfxap3aver;) s ba*oil 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 60 turns on its primary coil and 300 turns on its seczn /8 z+jdzmi*k8 svn0asc* 2zondary coil. If 120 V at 2.0 A is applied to the primary*/ks0z*2czsa+ iz8nd v8zm nj , 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 coiljjk25lcro ;0p and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sek rco2p50 j;jlcondary?

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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 z fgb8hc5lf h/m:.(tr0jxoa1and its secondary has 200 turns. If the input current at the primary is 1obc5 atg(f rhj x08m:1fh/ zl.00 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 transes 12c: yfuc +9ixot1pformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, wtsc9u2ixp e of1:1yc +e can 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 and its seli tv807gru 55v5ftjacondary has 200 turns. If the power input to the pri t7gr5fa5vj5ut8 l0 vimary 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 60 A of current at 120 V. The voltage is scurc*rmb u(56nj q f- e67(hqusually stepped up to 450 c q6(mb- eru*5u7c(6rjhnfsq 0 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A 07tns dfa74umh4hht/ of current at 120 V. The voltage is usually stepped up to 4500 V by a trasmhd 7t 7 t/4ahfnu04hnsformer 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 at 120 V. The voltage is usually -eyh3 pc8-adpstepped up to 4500 V by a transformer and transmitted through a powerp- e3p-a dcyh8 line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistancra:x)qh;/t(z ;x*s-dmu kiue k:qzo9e of 0.60 W. A generator produces 100h:t ud(zq q)k:k9;-io e rz;a*xsxu m/ 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 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. A9p m(jv0bb d jft9(n(c 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 ratij jv pn(bbcf(( 99md0to 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 -wen+,gb ljk7qp fzr( :u+pp+1000 V. How much less power would be lost if thquk w+n+pp l r(bez p:-,g+fj7e power 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 generator is 440 V at 20 A. It is to be transmitted i,cm,,3c vhbzv:fm xa5xb3d-on a line with resistance of 0.60 W. To what voltage must the generator outputcvz ,vb,fdmx ,xi353 - ahcmb: 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 energy is stfc*r tjpwqf2.ee)8y 5 ored in the coil's magnetic j 2w .eqfye f8pr5ct*)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 contal.7v *bhjz ;yoins a 6.0-W resistor and an 18-H inductor. What is this circuit's .*h vjz7ybol; 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 circuit where the rms voltage mk*us xe.32t vis 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 outlu;ri.tdg oo);h0t ;khis+(nvet. 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 resist*,a8et2wd w05vihi hw(vh 9e4ij q b*yance of the lamvdii5 bvw9h80h*we* hj w4(a ,y2eqitp?

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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-Vrfs2er q7qpti i;11 j9 ac power supply. What is the peak current through the re;ejq 1sqi r192 rftpi7sistor?

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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. jeupox l3 /+p, What is the power dissipated in the reso,j3upx p/el+istor?

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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-Wp57n ,:bmo64 do :mxy brhies2 a7f+s0)mrycb 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 resistobp4. ponr0f9m r 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 resiuya;abivh1efs ez: 01x/b5 l(u ua (+gstor 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 a7 *bgddhjnr4*kxn)n44g-jg y 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 reactancg5 7n9ls(ptffe 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-mH coil have 14.0 W of inductive cccy 2o2/j:d2h j8yrnreactance?

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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 t)upm-t*/5z9uih i suW 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 induc795gunl) vv 7p0gqfce tor when 120 V AC at a frequency of 20 kHz is appli0 vn7 57q9v)ugfgc elped 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 thro 6)chb sysx 3+m( prk5)dt,iufugh a 2.50-mH coil due to a 110-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 capacitive react/ ha;o2v a: ,xjx4qkhpm6 n1xkance 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 to have 50eq ohi 9sb)8lib08j9 +tgvdu; W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactancem)m6el7l7 6do7yl uja 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-osetue0e6 o; of a 0.010-mF capacitor be 100 W?u;6es o0o- eet

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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 capajw ;; z a8kx(11 b:jwij xfs3xzmq*nf*citor 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 sel3rr h :old,sjnj1n,*08pq:qkmoar 3ries circuit with 12.0 W resistance, 15.0 W inductive reactance,aoj,n qqd r,ophs* : l3r3m 1l:8n0jkr 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 1glj 9pv4zetczss0x 8e0 vo3 )(.0-mF capacitor are connectedg 8(zo p3jx9szelcv4 t0)0ves 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 1.0-mF cn5cq0xz.gh)b* w8xw2 caqb0;nn/tccapacitor are connecteqx w nbb.0z50axgnc hcccq nt)8;2w/*d 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 inductt3 lh3,gdscr+ gur/ -cor, what is the impedc3 rsg+,3hdlt-/cgurance 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 i e/6s+ zcyba3dtgdm p5nder* ukf7v (83k3r.wn series with a 20-mH inductor, what is the phase anwprer g k 3 (zk3c8d7bmd/ af*nv .ed35ytu+6sgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coied9ovmz+6mx 5 2qygf wixqso4h+6),zl and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?hom66z) wiy+gzvofqm 9+ed2q4sx5 x ,

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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-Wn /j* 9 xw0oj7vvu4gax resistor and 15-mH coil to getgnvv u w049/ o7xaj*xj 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 in series with a 450-mH inductor at 5000 9yw)hh2:q be: 68cb)xl: zca arukj5l Hz for a total 9bh6e 5 l: :qk)a l28wchrxz):jbucyaimpedance 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 puo5ufz.9 fk hgk52zq4st in series with a 100-kW resistor at 1.0-MHz for a total im .fhquo5z k49 z5gsk2fpedance 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 seri lo3 mztm/2xhu9,bne oj95gm9es with a 20-mF capacitor. What is the impedance a/bn3j5olz mom9t 92,9ghum ext 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with ;qs6m5x1ol c xa 10-mF capacitor at 1.0 kHz for a total impesm65 lqx x1co;dance 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 cwf t 6a.o6 2iwi/ k0a+amm-rb;g0nio zapacitor at 1.0 kHz for a phase ang 6a; g 2kmtz/riai.6ww b-af+ imn0o0ole of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W rehxwxxwgno 33 g**/2 qusistor at 1.0 kHz for a total imp3xwn*3*g wxhg/q 2xuoedance 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 100-mF f2/4t1 8ovzygtpe :lr capacitor at 120 Hz. What is the phase e4 gt/po18ylvt2zrf : 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 1500 Hz if a 100-W resistor, 20-mHug1h.b7 kn dz (-. ulupy+s ab/oul,(t coil, and 1.0-mF capacitor are connected in (+ghsu7 .zp,du/k- 1ytbn lbl.uu o (aseries?

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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 j jm(5zkgy35jgc)2e z ix:3to :+ihgl9icwu 7100-W resistor, a 10.0-mF capacitor, and a 0.350-H indu +we7 5jzuj3ci2:( iioc9yxl gzh:5kj 3)tg mgctor. 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 cabm*- fv zp 0:0jcgc:lopacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60:b-ojc:*mp lg00 cvz f-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 505, a;3luj;ztq w+;s+5 l u2dj+kcjskm+ iljd a-W resistor, a 10-mF c5cq3sl+ld+j2,;md +kuzt jls; u;ajjaw5+i kapacitor, and a 0.45-H 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 inh qb yox3 awd;e8vz,23 series with a 500-W resistor for a phase angle of ;ya3hvde 8, xbzq32wo $40^{\circ}$ 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 mgy2he 1qk p9h:F. At what frequency shoul2k pgqhe 91:hyd 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 12.0 W resistanceovte q8l x)4(b67qh;kp gfwgxn z:.(g, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a n o(gh.x f7el:8gqpg6 x4;( tzq)kwvb120-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 kz)k k-rdq2qm(/hx*wcircuit 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 resistanmppy1x 8: o,jjce of 30 W. What is y 1op8, mpx:jjthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series g),ijnrrwr*toq(q9 z. :9+e grq xra(RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conneeqg r9+r trzwj(o:*)qr a(r.qng9 ,x icted 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-mF capacitorc(ys(soamt(ujddy 9 g 30.r:b and a 15-mH coil in series?ga dbc : 9r(t3ys(udyso(.jm0

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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/s9jtjv m-u rg vxqi5p83 mg,4.7-mF capacitor for a resonant frequency of 10i pxj8,vmg r/ 3s4vt5gu9mj-q kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fre: xhrr3-bnymu7-)kqnv i w:-5)t spl iquen)rvh): u7p:t lwnmiqr x5-y3-bn - sikcy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plaaqvkz+,v0qm+w ku- n90l( ftyced in series with a 30-W resistor and a 40-mH coil if the resonant frequencyf k (utv 0ym-lz9,w0av+kqnq + of the circuit is to be 1000 Hz?

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