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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 ar;p0 lk;zrpougbo7m95j k1tr 7 e units of magnetic 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 st5 fofdc7 *a*nubeb cj)v7b; m,ates 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 of4;xh b70gd ns z0azt9d wire in a coil produces what kind of change on the indt9dszad h;bgzx70 0n 4uced $emf$, 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 magnet 1c(5. j (fj/oqw9hd0f bcoswgic field through a loop of wire produces what kind 0 c s9(./w5qjhfcf jodow1 b(gof 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 o*s, s cawm u,b44 +wu(mjchxmu6j6mb5f a loop of wire produces what kind of change on the induced u, mmwu*a+j 54mc4j ,shuw6(m 6bscxb$emf$, 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 magnetspwxv mz 9socben .60g*1e9dmf8g 6 5 utgjc)(ic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a congqyl;vp; /mq0ejt3iidsk-8b2 u5f (d ductor will be that which tends to produce which of the fo;e -ii0q 3sl u2p/yjf tbg(;vmqkdd58 llowing 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 h xlwj ohvob,5ui:/. o/orizontal table. A bar magnet is held above its center with its north pole poioo xo/,wuj:v b/lh5i. nting 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 horiz4q sej(1lds) yk/ x3 agce1a6vontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the cqscsgk del1/jy a)e34x61 v(aoil, 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 :6, 5.mqwp8 :uskz.yrct;o- xvfd hps region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this c6,crpm pw.s8::q ;fzu5koxv- y.t hsdoil 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:a- ninjik(+lfyy5 a (ld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is th+ i(-nyjla( any:kf5ie direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetmj--a wvb yiaxg+3p: /ic field points straight down. The magnet bgi+ v/m-yaa-wj p3x:ic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and cayf wunolt819 - 17ivmsrries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducei1wn 8 -1vtmy9lfuo7 sd 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 no;ei*6xwrx(bz2nh na. rth pole entering first. As the north pole enters the wire, x*wh6nn r (.z;bxeia2 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 axis whoy5fftw 7nj2 ,9zuel g/se direction can be vg9u7lf2y j,zwnf5 /et aried. 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 $emf$ 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 spewku/h1 . febbg4) +/p m2ujnt /haep8ya**bg jed 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 induc.wyh/nh buk*fgutjb4pam2+8*g e / b/1apj e)ed $emf$ 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.aiq gi8t06koj 4h+y: q
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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 ajj vmg:5/z j)fn $emf$ 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 magneticzc7. hlat,6szj voy (. field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at codax2m3 o) s,3/khirr qekt 4e/nstant velocity )2h3kektor /q x4 sdr/i3,aemthrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anu2 w44ub.+tf cs fy8s-pclnp. gular 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 trans ua( z9+8rousv9 .nwg-q wsh8dforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate)9kyd( s f7nids through 60 revolutions each second. The frequency of thednf9yk7 )s di( $emf$ 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 used tp/w t 9, m.wnh9(qntovo

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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 tv-9.nag9cq1cuj n 9yq ( uwzd:hat

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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 th2s,g balx* -ts1j;ts3zfbr 8se secondary coil contains more loops than the primary coil 2a; tstsx-sf sbl3 rg*18jzb, then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary co)hyf (lc592 pzkhr y8qil then9 )ch28kyfhypqz r(l5 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 b- z e5q8frqm4power 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 cd785qb z;vqq oin1t5 dircuit,

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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 ba0lc-t .q2sc:hyjn ;e lttery of constant terminal voltage. At the moment contact is made wlh0ec . :2j;qlcnys-t ith the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consta9 y odlf( ex8z*+uyl8ant terminal voltage. At the moment contact is made with the battery, the voltage (x z 8uyl8a+fy9del*oacross 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 inductanckpy :3-).qaa*ws (x :utmmn0 r etv6mte 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 anz;bpax9kx/ ++ wy /hlcd 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 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 indun9w gw1v 8eo0nctor are connected in series to a battery. The time constant for the circuit represents the time required for the current oe89 v1wwg0n nto 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 in58x gw+f8trqw 5kth8w2k1y xh ductor are connected in series to a battery. The battery is suddenly rem gtx5t wx8wwy+ qfk882 k5h1rhoved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the s6ivp o3v;mja0y5jm2 .xims-xame 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 supply. On this circui8 x+mv+y0hyyse ,f a9c wh0ss.t, 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. In this cx 08u bz.pqbso3x( f:dircuit, the current30dux (8o:b z.sfxpbq

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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 faclpcb cx0ivljl w8-3 zw 68h,4ctor when the frequencvb xwihpzc l8w4c jl, 08c36l-y is 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 thson *orynohsd m5onj- k:65 .)e AC voltage across an inductor is doubled, the inductive reactmdno )nnsr*ko5-s5ho. o:6 yj ance 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 approaches ze,xt d ,4hc4pvtro, the inductive reac4,tv h,d t4xcptance 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 powewb )(e:mx v z,nasj95sr supply. In this circuit, the currejsbe s():w5 xz an9,vmnt

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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 fafjy.5y+gz u5/ w;5dkv 0h i2tq an-orpctor when the frequency is tripledz;555agqt0 -n kfjdy./+rw yo2vph ui?

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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 capacito;,qi9ndaa9p3 r2pxvx r approaches zero, the capacitive reactance of that ;2ranaiqv x9d ,p3x9pcapacitor

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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 vwpd :b9i la08foltages of the inductor and capacitor in a Rfb0:ap dl98wi LC 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 circuit isn9k(s lr.3hqt5m2u ln 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. ld,ddmtwabdx f;( z-8f 4. +cv The impedance of the circuit increases if R increases. When is this statement trud v(dl,d-a8c dtm;z.+4w xf fbe?

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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 inc( n5xrn6 cnr3lvj rx52reases 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 circat9 l,g;hv nod9c:k2 wuit 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 doub8xx eqx;aco, 2t2 7bewle in an LRC series circuit, the resonant b q7; 8xex,2c e2wxatofrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voazr 6 p *qy/,.xcqc75e jjzvv8ltage. 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 occursh ae6 0y-:hohd when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magntrw **j-5zen a)u8whyetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop antwwy5zh-e8nj a r)u**d 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 uniqew- :dn1 hvl0g * vzh/ff6oc0form magnetic field of 0.20 T. Find the magnetic flux through the loop when theh oe-1nw*c0d f /f: zvlqghv06 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 ,q0 ;uhbho38yncpty4 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maut08pcy;qh 4hoy, 3nbgnetic 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 oi13kiqx73z2 o:fp etpiy c(+jf 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 coil changev2f/ryrtf k: qbhzdg 3;4b03bhi 6dx3 s 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 withdi(7dz gccn/ 4 3kxru3 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.i 7xc/z3urc g4dknd (30 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 wir0diugjhz;r2zs/xm 2;f p ls2 9e with 15 turns 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 area jg9ptw:xn*s 6$0.20 \; m^{2}$ 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 sldzs )(+j ,emkpan of 60 m flies horizontally at a location where the downward compon l(jek) +z,dmsent 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 rotat jg im6r/e 32m-iw.evtes at a constant angular velocity of 2.0 rad/s about a verticalgi2re/ie63t wm-. j mv axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area ogua3d4zd :gfda 44m3yocn fl*h2 tn10f $0.25 \; m^{2}$. 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 turnquaz( zqgzs0l) 88; wio8pkym 6 y0jl,s 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 rectangularcw q,j9h:z; +y*rak fq loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1qj9za r: ,yq*hfck+;w 200 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 consists of 100 turns of wire of mqz ,-gay.m9 marea $0.090 \; m^{2}$ 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 auk 1zi:: uhk8d:ot, qi simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiiu18ziqk h, uo:tdk::eld of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxim/bvfg cv + ;mp )aa1w.dhd65ifum $emf$ 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 mot wy/q /*je0xpxs 88vm 0acd+zror have a resistance 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 (en418ldlzg h omk7v4wm,:ea 6.00 W. The motor operates on 120 V AC, and wlz1wvda:k 8he,o(mgl4n7me 4 hen 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 connected 8 p4habn(mec )to a 24-V power supply. The operahcna )bpem 84(ting current 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 24-V pownchu2 7a,z9 vn, t5h yso)dpz(er supply. The operating current is 1.0 A at full speed. What is the backsy(7 c5a p zd9oh)zt,uvnn2,h $emf$ 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 6.3rsws ay/ )m4yg7 qeisguu2;( 0 W is connected to a 24-V power supply. The operatin)rsgw4y(s gu /miq u yae32s;7g current 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 4tp veg ;z221ogm+ a/dz22q kb gcfi*greduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfifdb*a4 z8mj; ormer causes 14 A to flow in the secondary. How jid8a*b4m;zf 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 p1h*: 1cxpcsi bmnuz 4+rimary if the 24-V secondary ha+c zmuh:*s4 i 11xcbnps 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 prizwpnmhugf1 ( : /npm(tz :3m.yo9p 2ngmary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whoy(z/3:p219p gwgn m(z:n n tmhf.upmat 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 transformer. Asstp)pyyf 7f8.0g rso l;uming 100% efficiency, how many)8.lprfyog0; yptf s7 amps at 24 V can flow in the 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 transformer provides 7vgh:i/mr3hj )h/3tj8 /gg ivq500 V at 10.0 mA. The primary coil operates on 120 V. What does the pr8 jh3//)t/hvvm3 ghijg:rqi gimary 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 i32tt4osisz; xm 6yu.yf sm2 )nts primary coil and 300 turns on its secondary coil. If 12tyiou42tfxn3s.2s m6 ys); zm 0 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seclh,:pt2 ph 7nwondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the,pln2:htw ph 7 secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. jro gtl2*4 f(s If the*j tg4lr(sf2o input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. vtfdls(ds7jw49 u .t7cd9h/oIf the input jf9ltwv7dt.4s9dous d (7h/c voltage to the primary is 100 V, we 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 h /zlb fnhwpo)jz(y+9, as 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondafb wy9pj/(+)on zh l,zry 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 dzj , y;5vh ).1tplkyfvoltage is usually stepped up to 4500 V by a transformet.l;p,k 5 )zfjhv1dyyr 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 of 32elrps 8le0l*tw 7j2iua mx;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. Fin *ix0am7w8uejt2el 3pl2sr ;ld 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 piolh;0k)c+p 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 percentage power lost in the transmission line if the voltage is not steppedco+l p 0);kihp 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 kmq+hyrkn05, vy2 yj -gy long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer werevy2ynr0y qj+k hgy-, 5 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 :vj4f0yp1o f 3+ ywuo qttu67uline 50 km long has a total resistance of 0.60 W. A generator produces+ yyvto tq6 uuw 0fo74puj:31f 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when 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 ,hc ewg0 *qc.a 3.;byl;flwhowould be lost w;y,qc3;h* 0g l.wohbcf .l eaif the 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 on a jb;3zdcl mv, l 5(rdo-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 0.010% of the original poc( z bjdd5;-,lvm3lo rwer?

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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 currentqa(id 0/yyaf9 of 5.0 A. How much energy is stored in the coil's magnetic d ayq(9i/ay0f field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductdb 321z;nk5c,ht 6qsjqtw( bdor. What is this circuit's time cons; q,2nw6dctk 3b t5bzdj(1q hstant?

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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 wher s /s:cz)*9nhj4svmq ge the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cur9k;vg+p ah5 -svcdhm2rent?

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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 zc91e zdq m4r;a 120-V AC outlet. What is the resistance of the lampc;rq94zde 1m z?

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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 f0i-l+*llpxmz6r7d* chsq , jpower supply. What is the peak current through th+*cslh60 d,p ll7x qmj*rz f-ie 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. Wh u w+sjem/qg8 x)ko1v,at is the power dissipated in the re j+ ,xqomwv g/k)u8se1sistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through *rp6 p)ej uhq7a 50-W 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 om*3,x : rhbtj2 (admn50-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 resistor iz lsh.om1)b+hwvd, 7q s $I = 0.80 \sin (240 t)$. 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 pjuh *eu62r r-1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ofnoh9 g t1q/p gbarh198 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 18l/,xp1n +wvsxkj kl)2y4 h +xc hlvhinductive 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 15my*68atb imqy*0h :wlx, zx p97 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 6poxk.v48k :lr cfj:x/0-mH inductor when 120 V AC at a frequency of 20 kHz is applied to i.lkxvjrp/8f kx:4 :oc t?

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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 thro6 /6bz;-voz s dm7dgfhugh 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 reactance of a 4.7-mF capacitor at 10 kHz? nf( sekq4xw32

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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 )8ct)rr7p 1 tfp8p6qwcs lln 6reactance 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 6-qluqmv/ b8eocy8evg 890r fa 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 10l f6wpsd je((-0 W?l-p(fdj sw 6e(

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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 ca7o gsv- t 1wwok4i 8whn0a1/clpacitor 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 12.0 W resistan bjj,m ,ray. tvq2tm 65o5l0cbce, 15.0 W inductive reactance, and 10.0 W cm ol5ctqvjb , yj6 t,b5ra2.0mapacitive 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 av;/yfpeifzc :r/w oum:( 8lb. 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieo /:(: b z8/ wfyi;fevlurmp.cs?

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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 cm+qfhqa:; ypy 3 9-off 3a h-qypf9y;f+m foq:apacitor 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, what is r.d (6o*k.cq *rj cokcthe impedance at kd6ocr.cq kcj .(o**r1000 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 connecter-p39,9kxb,b s rwv bigrf- g/d in series with a 20-mH inductor, what is the phase axrp,rfbi/ggw ,b9 -svb3-k9 rngle 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 withwd3pk5o xb sa1 x2 q/,m )p(u/o8axdno a 20-mH coil and 1.0-mF capacitor for a total impedance 5(/wkoxbdx3o 1qnoa8s) pau/ m,x2pdof 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 w:bhe5b + rch uodwo-iz2t(3t5 xgo8, eith a 100-W resistor and 15-mH coil to get a total impedanb5i-bez(ed3 ,h u oocx+8gh5w2t:ro tce 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-mb* i8 hde465v0 edz8d*dyjnbu H inductor at 5000 Hz for a total iiu*4 je0dyb6zv8d h dd*n5b 8empedance 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 sw6x ,mbwg e r4sz0 poyn2hw)hr)85d/d eries with a 100-kW resistor at 1.0-MHz for a totalghw5d)2z r)8 wob46ywrh/m enp0 sdx , 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 ams3w; 4 u+aiyx 20-mF capacitor. What is the impedance axwi4su ;ya+3mt 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 neededty n(stc.kr8 8f(c5fd dpx g80 in series with a 10-mF capacitor at 1.0 kHz for a totat5. cdp8ft 8k(yrsgcnd8x(f0 l impedance 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 cu2 6aisdctw;hc/,:plapacitor at 1.0 kHz for a phase anc :pd lsi;26,tw/hucagle 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 resistor at 1.0 kHz for a :f/ ywst6ki d;total imdfs6/yt: kw;ipedance 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 capacitor at 120 Hz. get6u77 99 l+vtvqc ga What is the phase angg6vag7e9c9 7+vl qtutle?

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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-mH cowdm+k7 o;n)xvle.7k ng n)2 gjil, and 1.0-mF capac nv2o glkgnk) em.x;7)d j+nw7itor 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 100-W resistor, a 10.0-mF capacitor, a bmte/s7p*pq 3xos7 rn x2f)o)nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What oe/))mqsn oxr72* tpb3 sfp7xis 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 x0je7lfu-k0ftsjvi1 j58 w-g capacitor of capacitive reactance 30 W, and an inductor of int150gfj-8 jx w u0e-7kilsfjvductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistorr(t)xkm.eoua+:na/h , a 10-mF capacitor, and u.x)k/t:n am+(arheo 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 in series with a 500-W resisto 5kt;f r7)f3huwf0 jwj4 6faofr for a phase angle of aktwf h4r wu; 3j6o0f7j 5ff)f$40^{\circ}$ 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 = 20e rrx fu 4i9w,v9b1ctim*e2il1rrf08.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powelbu9e180fi cwe xr91vr* fmr4 it ,ri2r 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 resistance, 15.0 ;zd2/qlt p3zlavvw 8a8mm e2)W inductive reactance, and 10.0 W capacitive reactance, when thelep8m d lza3va qz/2; twvm82) circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitnxpcn+p -h y0rs 8(1gr 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 okepmpvy* )t.zk ofye(s 0u.qpun q640- +;tlg f 60 W and a resistance of 30 W. What is .eu zeyv p( *k0+fg-opp 4u s)lqkty.n0t;m6q the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistoz3 z g(yt us:e5 cp7.kflh:4cor, a 10-mF capacitor, and a 0.4 l7z3hc yt:s.pf5k4e(zo gu:c5-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequz( oe;m zu3b8cail(y( ency of a 1.0-mF capacitor and a 15-mH coil in series?y(3;ola bi8( mzz(uec

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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 w 9 m(ffqkl-;keith a 4.7-mF capacitor for a resonant frequency of 10 kHq9l;kf-e (mkf z?

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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 y6irm7fz:-pkfznyq 9v-2 y: bcz3p5tfor a resonant frequency o2 n7 ytbifymkcr369fy-zvp pq: -:5zzf 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 p 8 k q3j1ju:ksks1w1ahlaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circj 11sa khs w:u1qj8k3kuit is to be 1000 Hz?

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